CN106959623A - The hydrometeorological data transfer control system of ship based on the Big Dipper and method - Google Patents

Abstract

The invention relates to a Beidou-based ship hydrometeorological data transmission control system, which includes a hydrometeorological center and a plurality of hydrometeorological observation points, wherein each hydrometeorological observation point is set on a corresponding ship, and the hydrometeorological center includes Computing control server, first RDSS communication module and data server, each hydrometeorological observation point includes RNSS positioning module, second RDSS communication module, calculation module, control module, hydrometeorological multi-element acquisition module and ship status information acquisition module. The invention can automatically adjust the data transmission frequency according to the change range of hydrometeorological information and the density of hydrometeorological observation points, and can accurately reflect the change of hydrometeorological information while reducing the number of Beidou messages, thereby saving energy consumption and precious satellite communication bandwidth.

Description

Beidou-based ship hydrometeorological data transmission control system and method

technical field

The invention relates to the technical field of computer communication, in particular to a Beidou-based ship hydrometeorological data transmission control system and method.

Background technique

With the increasing maturity of Beidou satellite positioning (via RNSS, Radio Navigation Satellite Service) and short message communication (via RDSS, Radio Determination Satellite Service), more and more hydrological Meteorological observation stations use Beidou satellite communication to realize hydrometeorological data transmission, especially in areas where communication cannot be achieved through traditional communication methods (wired, GPRS and VHF/UHF, etc.), such as remote mountainous areas, islands, oil platforms and ocean-going vessels. Beidou RDSS communication provides a solution for the real-time return of hydrometeorological data in these areas, so that the transmission of hydrometeorological data can not be limited by time and region.

The existing hydrometeorological observation equipment based on Beidou communication adopts the method of fixed interval collection and transmission (the data transmission interval is greater than the minimum communication interval of Beidou satellite short message). This transmission method sends the hydrometeorological data of the observing equipment to the hydrometeorological center within a fixed time point. However, if the sending interval is short, the observation equipment will consume a lot of energy and occupy a large Beidou communication channel; if the sending interval is long, it may not be able to accurately reflect the hydrometeorological changes of the observation point. In addition, due to geographical constraints or ocean currents, the location of observation equipment may change, making the geographical distribution of observation equipment uneven. Even so, all equipment still sends hydrometeorological data at the same frequency. In short, the existing observation equipment based on Beidou communication can neither adjust the frequency of data transmission according to the hydrometeorological changes nor the density of observation points.

Contents of the invention

The purpose of the present invention is to provide a Beidou-based ship hydrometeorological data transmission control system and method, which can adaptively adjust the frequency of sending Beidou message data according to hydrometeorological changes and observation point position information, and solve the problem of Due to the inability to adaptively adjust the data transmission interval in the prior art, there are technical problems of high energy consumption, low collection accuracy, poor controllability and real-time performance of collected data.

In order to solve the above technical problems, the present invention discloses a Beidou-based ship hydrometeorological data transmission control system, which is characterized in that it includes a hydrometeorological center and a plurality of hydrometeorological observation points, wherein each hydrometeorological observation point is set at On a corresponding ship, the hydrometeorological center includes a calculation control server, a first RDSS communication module and a data server, and each hydrometeorological observation point includes an RNSS positioning module, a second RDSS communication module, a calculation module, a control module, a hydrometeorological Multi-element collection module and ship status information collection module;

The data server communication terminal of the calculation control server is connected to the communication terminal of the data server, and the RDSS terminal of the calculation control server is connected to the server terminal of the first RDSS communication module;

The RDSS connection terminal of the calculation module in each hydrometeorological observation point is connected to the calculation module terminal of the second RDSS communication module, the RNSS terminal of the calculation module is connected to the communication terminal of the RNSS positioning module, and the communication terminal of the hydrometeorological multi-element acquisition module is connected to the control The module's hydrometeorological data acquisition and hydrometeorological data acquisition interval control interface, the communication terminal of the ship status information acquisition module is connected to the control module's ship status data acquisition and ship status acquisition interval control interface, and the hydrometeorological data and ship navigation data output terminal of the control module Connect the hydrometeorological data and ship navigation data input end of the calculation module; the Beidou message transmission interval output end of the calculation module is connected to the Beidou message transmission interval input end of the control module;

The first RDSS communication module communicates wirelessly with the second RDSS communication module of each hydrometeorological observation point through the Beidou satellite.

A method for transmitting hydrometeorological data of ships utilizing the above-mentioned system is characterized in that it comprises the steps of:

Step 1: In each hydrometeorological observation point, the hydrometeorological multi-element acquisition module collects the hydrological information and meteorological information of the measured ocean area in real time, and the ship status information acquisition module collects the navigation data of the measured ship in real time; The observation points are global satellite positioned, and the global satellite positioning data of the corresponding hydrometeorological observation points are transmitted to the calculation module;

Step 2: In each hydrometeorological observation point, the control module collects the hydrological information and meteorological information of the measured ocean area and the navigation data of the measured ship, and transfers the collected hydrological information and meteorological information of the measured ocean area and the measured ship The navigation data is transmitted to the corresponding calculation module, which corrects the collected hydrometeorological information according to the ship’s navigation data. The correction method is to correct the wind speed and wind direction in the hydrometeorological information through the ship’s speed and heading. The hydrometeorological information and the global satellite positioning data of the corresponding hydrometeorological observation points are packaged into Beidou messages by means of difference compression;

Step 3: In each hydrometeorological observation point, the calculation module sends the Beidou message to the calculation control server through the second RDSS communication module, the Beidou satellite and the first RDSS communication module according to the preset initial data transmission interval, and the calculation control server will The Beidou message is sent to the data server;

Step 4: The calculation control server calculates the new Beidou message sending interval for each hydrometeorological observation point, and the new Beidou message sending interval T _i of each hydrometeorological observation point i is calculated according to the following formula:

T _i =v ₁ A _i +v ₂ B _i

Among them, A _i and B _i are the hydrometeorological factors and geographical factors that determine the sending interval T _i respectively, v ₁ is the weight of A _i , and v ₂ is the weight of B _i ;

The hydrometeorological factor Ai of hydrometeorological observation point _i is calculated as follows:

Among them, ΔT _i is the existing Beidou message sending interval of hydrometeorological observation point i, that is, the time difference between the last record of hydrometeorological observation point i received by the calculation control server and this record, ΔE _ij is the ith hydrometeorological observation point i The difference between a record on the observation point and the jth hydrometeorological element in this record, w _j is the weight of the hydrometeorological element, j=1,..., n, n is the number of hydrometeorological elements;

The geographical factor B _i of observation point i is calculated as follows:

Among them, D _ik is the distance between hydrometeorological observation point i and hydrometeorological observation point k;

v ₂ is a fixed value for all hydrometeorological observation points i, and can be calculated by the following formula:

Wherein, min(B _i , i=1,...,k) represents the smallest B _i among all hydrometeorological observation points, and T _min represents the minimum interval for sending messages by the second RDSS communication module;

w _p and w _q satisfy w _j respectively:

make:

Except for w _p and w _q , the remaining values of w _j remain unchanged;

v ₁ is a preset value for all hydrometeorological observation points, which makes the transmission interval T _i of all hydrometeorological observation points be between the minimum interval T _min and the maximum interval T _max ;

Step 5: If the new Beidou message sending interval of a certain hydrometeorological observation point is not the same as the sending interval of the original Beidou message, then the calculation control server passes the first RDSS communication module, the Beidou satellite and the second RDSS communication module Send the new Beidou message sending interval to the corresponding computing module, and the computing module will update its own Beidou message sending interval after receiving the new Beidou message sending interval, and send the new Beidou message sending interval to the corresponding Control module, the control module adjusts the information collection interval of the corresponding hydro-meteorological multi-element acquisition module and the ship status information acquisition module according to the new Beidou message sending interval, and the information acquisition interval of the meteorological multi-element acquisition module and the ship status information acquisition module is always It is equal to the Beidou message sending interval at the same time.

The basic principle of the present invention is: through the central server of hydrometeorology, the frequency of sending Beidou messages is lower in the denser locations of hydrometeorological observation points, and the frequency of information transmission is lower when the change range of hydrometeorological information is lower.

The invention can automatically adjust the data transmission frequency according to the change range of hydrometeorological information and the density of hydrometeorological observation points, and can accurately reflect the change of hydrometeorological information while reducing the number of Beidou messages, thereby saving energy consumption and precious satellite communication bandwidth.

Description of drawings

Fig. 1 is a block diagram of the present invention;

Among them, 1—hydrometeorological center, 1.1—calculation control server, 1.2—first RDSS communication module, 1.3—data server, 2—hydrometeorological observation point, 2.1—RNSS positioning module, 2.2—second RDSS communication module, 2.3— Calculation module, 2.4—storage module, 2.5—control module, 2.6—hydrometeorological multi-element acquisition module, 2.7—ship status information acquisition module.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The present invention relates to a ship hydrometeorological data transmission control system based on Beidou, as shown in Figure 1, it includes a hydrometeorological center 1 and a plurality of hydrometeorological observation points 2, wherein each hydrometeorological observation point 2 is set on a ship On the corresponding ship, the hydrometeorological center 1 includes a computing control server 1.1, a first RDSS communication module 1.2 and a data server 1.3, and each hydrometeorological observation point 2 includes an RNSS positioning module 2.1, a second RDSS communication module 2.2, and a computing module 2.3 , control module 2.5, hydrometeorological multi-element acquisition module 2.6 and ship status information acquisition module 2.7;

The data server communication terminal of the calculation control server 1.1 is connected to the communication terminal of the data server 1.3, and the RDSS terminal of the calculation control server 1.1 is connected to the server terminal of the first RDSS communication module 1.2;

The RDSS terminal of calculation module 2.3 in each hydrometeorological observation point 2 is connected to the calculation module terminal of the second RDSS communication module 2.2, and the RNSS terminal of calculation module 2.3 is connected to the communication terminal of RNSS positioning module 2.1, and the hydrometeorological multi-element acquisition module The communication terminal of 2.6 is connected to the hydrometeorological data acquisition and hydrometeorological acquisition interval control interface of the control module 2.5, the communication terminal of the ship status information acquisition module 2.7 is connected to the ship status data acquisition of the control module 2.5 and the ship status acquisition interval control interface, and the control module 2.5 The hydrometeorological data and the ship navigation data output end of the calculation module 2.3 are connected to the hydrometeorological data and the ship navigation data input end; the Beidou message transmission interval output terminal of the calculation module 2.3 is connected to the Beidou message transmission interval input end of the control module 2.5;

The first RDSS communication module 1.2 communicates wirelessly with the second RDSS communication module 2.2 of each hydrometeorological observation point 2 through the Beidou satellite. Positioning, so a small amount of data can be included in the message to achieve communication. The advantage is that it covers a wide area. In theory, it can cover the global surface without dead ends. .

Each hydrometeorological observation point 2 also includes a storage module 2.4, and the data storage terminal of the calculation module 2.3 is connected to the corresponding communication terminal of the storage module 2.4.

In the above technical solution, each hydrometeorological multi-element acquisition module 2.6 is used to collect hydrological information and meteorological information of the measured area of the ocean;

Each ship status information acquisition module 2.7 is used to collect corresponding measured ship navigation data (such as course and speed data);

Each control module 2.5 is used to output the corresponding hydrometeorological data collection interval and ship navigation data collection interval;

Each control module 2.5 is also used to transmit the acquired hydro-meteorological data and ship navigation data to the corresponding computing module 2.3.

Each RNSS positioning module 2.1 is used to perform global satellite positioning on the corresponding hydrometeorological observation point 2, and transmit the global satellite positioning data of the corresponding hydrometeorological observation point 2 to the calculation module 2.3; the full English name of RNSS is RadioNavigation Satellite System, and the user passes Passively receive satellite signals to achieve positioning, without communication functions. Both GPS in the United States and Beidou II in China belong to RNSS. The advantages are that the positioning speed is fast, the power consumption of the equipment is low, and there is no need for two-way communication with satellites.

Each calculation module 2.3 is used to correct the collected hydro-meteorological information according to the corresponding ship navigation data, and pack the corrected hydro-meteorological information and the global satellite positioning data corresponding to the hydro-meteorological observation point 2 into Beidou by means of difference compression message.

Each second RDSS communication module 2.2 is used to receive the Beidou message transmitted by the corresponding calculation module 2.3, and transmit the Beidou message to the first RDSS communication module 1.2 through the Beidou satellite;

Each storage module 2.4 is used for temporarily storing corresponding Beidou messages.

In the above technical solution, the first RDSS communication module 1.2 is used to receive the Beidou message transmitted by the second RDSS communication module 2.2 of each hydrometeorological observation point 2 through the Beidou satellite, and forward the Beidou message to the computing control server 1.1 ;

The calculation control server 1.1 is used to calculate the new Beidou message sending interval of each hydrometeorological observation point 2 according to the received Beidou message, and each new Beidou message sending interval is passed through the first RDSS communication module 1.2 and the second RDSS communication module 1.2. The RDSS communication module 2.2 feeds back to the corresponding calculation module 2.3;

The data server 1.3 is used for storing the corrected hydrometeorological data of all hydrometeorological observation points 2 .

A method for transmitting hydrometeorological data of ships utilizing the above system, it comprises the steps of:

Step 1: In each hydrometeorological observation point 2, the hydrometeorological multi-element acquisition module 2.6 collects the hydrological information and meteorological information of the ocean measured area in real time, and the ship status information acquisition module 2.7 collects the navigation data of the measured ship in real time; the RNSS positioning module 2.1 Carry out global satellite positioning to the corresponding hydrometeorological observation point 2, and transmit the global satellite positioning data of the corresponding hydrometeorological observation point 2 to the calculation module 2.3 (the hydrometeorological data include n hydrometeorological elements, such as atmospheric pressure, wind direction, seawater temperature and Atmospheric temperature, etc., represented by E);

Step 2: In each hydrometeorological observation point 2, the control module 2.5 collects the hydrological information and meteorological information of the measured ocean area and the navigation data of the measured ship, and collects the hydrological information and meteorological information of the measured ocean area and the collected The measured ship navigation data is transmitted to the corresponding calculation module 2.3, and the calculation module 2.3 corrects the collected hydrometeorological information according to the ship navigation data. Module 2.3 packs the revised hydrometeorological information and the global satellite positioning data corresponding to hydrometeorological observation point 2 into a Beidou message by means of difference compression, and stores it in storage module 2.4 (the global satellite positioning data is first used for observation point positioning, Because the collected hydrometeorological information needs to know where the data is collected; secondly, the location of all observation points needs to be known when calculating the hydrometeorological information of each observation point.);

Step 3: In each hydrometeorological observation point 2, the calculation module 2.3 sends the Beidou message to the calculation control server 1.1 through the second RDSS communication module 2.2, the Beidou satellite and the first RDSS communication module 1.2 according to the preset initial data transmission interval , the computing control server 1.1 sends the Beidou message to the data server 1.3;

Step 4: Calculation and control server 1.1 calculates the new Beidou message sending interval for each hydrometeorological observation point 2, and the new Beidou message sending interval T _i of each hydrometeorological observation point i is calculated according to the following formula:

T _i =v ₁ A _i +v ₂ B _i

Among them, A _i and B _i are the hydrometeorological factors and geographical factors that determine the sending interval T _i respectively. The greater the hydrometeorological change, the greater the value of A _i , and the larger the value of B _i is at geographically sparser observation points. v ₁ is A The weight of _i , v ₂ is the weight of B _i ;

The hydrometeorological factor Ai of hydrometeorological observation point _i is calculated as follows:

Among them, ΔT _i is the existing Beidou message sending interval of hydrometeorological observation point i, that is, the time difference between the last record of hydrometeorological observation point i received by the calculation control server 1.1 and this record, and ΔE _ij is the i-th hydrological The difference between a record on the meteorological observation point and the jth hydrometeorological element in this record, w _j is the weight of the hydrometeorological element, j=1,..., n, n is the number of hydrometeorological elements;

The geographical factor B _i of observation point i is calculated as follows:

Among them, D _ik is the distance between hydrometeorological observation point i and hydrometeorological observation point k;

v ₂ is a fixed value for all hydrometeorological observation points i, and can be calculated by the following formula:

Wherein, min(B _i , i=1,...,k) represents the smallest B _i among all hydrometeorological observation points, and T _min represents the minimum interval for sending messages by the second RDSS communication module 2.2;

w _p and w _q satisfy w _j respectively:

make:

Except for w _p and w _q , the remaining values of w _j remain unchanged;

There are n total w _j , which are w ₁ ... w _n (w _p and w _q are also among them), corresponding to the formula There are also n, respectively The largest of n expressions is The corresponding w _j is w _p , and the smallest of the n formulas is The corresponding w _j is w _q ;

v ₁ is a preset value for all hydro-meteorological observation points 2, which makes the transmission interval T _i of all hydro-meteorological observation points 2 between the minimum interval T _min and the maximum interval T _max ;

Step 5: If the new Beidou message sending interval of a certain hydrometeorological observation point 2 is not the same as the sending interval of the original Beidou message, then the calculation control server 1.1 passes the first RDSS communication module 1.2, the Beidou satellite and the second The RDSS communication module 2.2 sends the new Beidou message sending interval to the corresponding computing module 2.3, and the computing module 2.3 will update its own Beidou message sending interval after receiving the new Beidou message sending interval, and send the new Beidou message The transmission interval is sent to the corresponding control module 2.5, and the control module 2.5 adjusts the information collection interval of the corresponding hydrometeorological multi-element acquisition module 2.6 and the ship status information acquisition module 2.7 according to the new Beidou message transmission interval, and the meteorological multi-element acquisition module 2.6 The information collection interval of the ship status information collection module 2.7 is always equal to the Beidou message sending interval at the same time.

In the above technical solution, the meteorological elements in the hydrometeorological elements include temperature, humidity, atmospheric pressure, precipitation, wind speed, wind direction, visibility and PM2.5; the hydrological elements include water depth, water temperature, seawater salinity, ocean current type, seawater Color, sea water transparency.

The content not described in detail in this specification belongs to the prior art known to those skilled in the art.

Claims (8)

1. a kind of hydrometeorological data transfer control system of the ship based on the Big Dipper, it is characterised in that：It is included in hydrometeorology The heart (1) and multiple hydrometeorological observations point (2), wherein, each hydrometeorological observation point (2) is arranged on a corresponding ship On, hydrometeorological center (1) includes calculating control server (1.1), the first RDSS communication modules (1.2) and data server (1.3), each hydrometeorological observation point (2) includes RNSS locating modules (2.1), the 2nd RDSS communication modules (2.2), calculated Module (2.3), control module (2.5), hydrometeorological many key element acquisition modules (2.6) and Vessel's Description information acquisition module (2.7)；

The communication ends of the data server communication ends connection data server (1.3) for calculating control server (1.1), are calculated The RDSS terminals of server (1.1) are controlled to connect the server terminals of the first RDSS communication modules (1.2)；

The RDSS terminals of computing module (2.3) connect the 2nd RDSS communication modules (2.2) in each hydrometeorological observation point (2) Computing module terminals, computing module (2.3) RNSS terminals connection RNSS locating modules (2.1) communication ends, the hydrology The hydrometeorological data acquisition and hydrometeorology of the communication ends link control module (2.5) of meteorological many key element acquisition modules (2.6) Acquisition interval control interface, the Vessel's Description of the communication ends link control module (2.5) of Vessel's Description information acquisition module (2.7) Data acquisition and Vessel's Description acquisition interval control interface, the hydrometeorological data and ship's navigation data of control module (2.5) The hydrometeorological data and ship's navigation data input pin of output end connection computing module (2.3)；The Big Dipper of computing module (2.3) The Big Dipper message that message sends interval output end link control module (2.5) sends interval input；

The first RDSS communication modules (1.2) are led to by big-dipper satellite and the 2nd RDSS of each hydrometeorological observation point (2) Interrogate module (2.2) radio communication.

2. the hydrometeorological data transfer control system of the ship based on the Big Dipper according to claim 1, it is characterised in that：Often Individual hydrometeorological observation point (2) also includes memory module (2.4), the data storage end connection correspondence storage of computing module (2.3) The communication ends of module (2.4).

3. the hydrometeorological data transfer control system of the ship based on the Big Dipper according to claim 1, it is characterised in that：Often Individual hydrometeorological many key element acquisition modules (2.6) are used for the hydrographic information and weather information for gathering ocean tested region；

Each Vessel's Description information acquisition module (2.7) is used to gather the tested ship's navigation data of correspondence；

Each control module (2.5) is used to export between corresponding hydrometeorological data acquisition intervals and ship's navigation data acquisition Every；

Each control module (2.5) is additionally operable to transmit the hydrometeorological data obtained and ship to corresponding computing module (2.3) Aeronautical data.

4. the hydrometeorological data transfer control system of the ship based on the Big Dipper according to claim 3, it is characterised in that：Often Individual RNSS locating modules (2.1) are used to carry out global positioning satellite to corresponding hydrometeorological observation point (2), and by corresponding water The vigour of style is transferred to computing module (2.3) as the global positioning satellite data of observation station (2)；

Each computing module (2.3) is used for the hydrometeorological information gathered according to corresponding ship's navigation data correction, and will Revised hydrometeorological information uses the side that difference is compressed with the global positioning satellite data of corresponding hydrometeorological observation point (2) Method is packaged as Big Dipper message.

Each 2nd RDSS communication modules (2.2) are used for the Big Dipper message for receiving correspondence computing module (2.3) transmission, and by the Big Dipper Message gives the first RDSS communication modules (1.2) by Beidou satellite transmission.

5. the hydrometeorological data transfer control system of the ship based on the Big Dipper according to claim 2, it is characterised in that：Often Individual memory module (2.4) is used for the corresponding Big Dipper message of interim storage.

6. the hydrometeorological data transfer control system of the ship based on the Big Dipper according to claim 1, it is characterised in that：Institute State the first RDSS communication modules (1.2) and lead to for receiving the 2nd RDSS communication modules (2.2) of each hydrometeorological observation point (2) The Big Dipper message that Beidou satellite transmission comes is crossed, and Big Dipper message is transmitted to calculating control server (1.1)；

The control server (1.1) that calculates is used to calculate each hydrometeorological observation point (2) according to the Big Dipper message of reception New Big Dipper message sends interval, and by each new Big Dipper message send interval by the first RDSS communication modules (1.2) and 2nd RDSS communication modules (2.2) feed back to corresponding computing module (2.3)；

Hydrometeorological data after amendment of the data server (1.3) for storing all hydrometeorological observation points (2).

7. the hydrometeorological data transmission method of the ship of system described in a kind of utilization claim 1, it is characterised in that it is included such as Lower step：

Step 1：In each hydrometeorological observation point (2), hydrometeorological many key element acquisition modules (2.6) are tested collection ocean in real time The hydrographic information and weather information in region, the tested ship's navigation data of Vessel's Description information acquisition module (2.7) collection in real time； RNSS locating modules (2.1) carry out global positioning satellite to corresponding hydrometeorological observation point (2), and by corresponding hydrometeorological observation The global positioning satellite data of point (2) are transferred to computing module (2.3)；

Step 2：In each hydrometeorological observation point (2), the hydrographic information of control module (2.5) collection ocean tested region is gentle Image information and tested ship's navigation data, and by the hydrographic information and weather information of the ocean tested region collected and by Survey ship's navigation data and be transferred to corresponding computing module (2.3), the computing module (2.3) is according to ship's navigation data correction institute The hydrometeorological information of collection, correcting mode is the speed of a ship or plane and course by ship to the wind speed and direction in hydrometeorological information It is modified, computing module (2.3) is by global satellite of the revised hydrometeorological information with corresponding hydrometeorological observation point (2) The method that location data is compressed using difference is packaged as Big Dipper message；

Step 3：In each hydrometeorological observation point (2), computing module (2.3) sends interval by north according to default primary data Bucket message is sent to calculating control by the 2nd RDSS communication modules (2.2), big-dipper satellite and the first RDSS communication modules (1.2) Server (1.1), calculates control server (1.1) and Big Dipper message is sent into data server (1.3)；

Step 4：It is respectively that each hydrometeorological observation point (2) calculates new Big Dipper message transmission to calculate control server (1.1) Interval, each hydrometeorological observation point i new Big Dipper message sends interval T_iCalculated according to equation below：

T_i=v₁A_i+v₂B_i

Wherein, A_iAnd B_iIt is to determine to send interval T respectively_iHydrometeorological factor and geographic factor, v₁For A_iWeights, v₂For B_i Weights；

Hydrometeorological observation point i hydrometeorological factor A_iIt is calculated as below：

Wherein, Δ T_iIt is that the existing Big Dipper messages of hydrometeorological observation point i send interval, that is, calculates control server (1.1) and receive Upper one of hydrometeorological observation point i recorded this record time difference, Δ E_ijIt is one on i-th of hydrometeorological observation point Bar records the difference with j-th of Hydrometeorological Factors in this record, w_jIt is the weights of the Hydrometeorological Factors, j=1 ..., N, n are Hydrometeorological Factors number；

Observation station i geographic factors B_iIt is calculated as below：

Wherein, D_ikIt is the distance between hydrometeorological observation point i and hydrometeorological observation point k；

v₂All it is fixed value for all hydrometeorological observation point i, can be calculated by following formula：

Wherein, min (B_i, i=1 ..., k) represent B minimum in all hydrometeorological observation points_i, T_minRepresent that the 2nd RDSS leads to Interrogate the minimum interval that module (2.2) sends message；

w_pAnd w_qFor w_jMeet respectively：

Order：

Except w_pAnd w_qOutside, remaining w_jValue keeps constant；

v₁It is a preset value for all hydrometeorological observation points (2), the preset value causes all hydrometeorological observation points (2) transmission interval T_iIn minimum interval T_minWith largest interval T_maxBetween；

Step 5：If the new Big Dipper message of some hydrometeorological observation point (2) sends interval with being sent out with the primary Big Dipper message sent Interval is sent to differ, then calculating control server (1.1) passes through the first RDSS communication modules (1.2), big-dipper satellite and second New Big Dipper message is sent interval and is sent to corresponding computing module (2.3), computing module by RDSS communication modules (2.2) (2.3) receive new Big Dipper message and send and will be updated behind interval the Big Dipper message of itself and send interval, and by new Big Dipper report Text sends interval and is sent to corresponding control module (2.5), and control module (2.5) sends interval adjustment according to new Big Dipper message The hydrometeorological many key element acquisition modules (2.6) of correspondence and the information gathering interval of Vessel's Description information acquisition module (2.7), it is described The information gathering interval of meteorological many key element acquisition modules (2.6) and Vessel's Description information acquisition module (2.7) all the time with a period of time It is equal that the Big Dipper message at quarter sends interval.

8. the hydrometeorological data transmission method of ship according to claim 7, it is characterised in that：The Hydrometeorological Factors In meteorological element include temperature, humidity, atmospheric pressure, precipitation, wind speed, wind direction, visibility and PM2.5；Hydrographic features bag Include the depth of water, water temperature, seawater salinity, ocean current type, color intensity of sea water, seawater transparency.