JPH01250085A - Gps receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a GPS receiver, in which - layer details include, for example:
In a GPS receiver that receives radio waves from multiple artificial satellites and determines the location of the reception point in order to measure the current position of a car, the user manually inputs the initial position data of the car when the GPS receiver is turned on. The present invention relates to a GPS receiver configured to be able to start reception and positioning without having to do so.

[Background of the invention] For mobile objects that move from time to time, such as ships and aircraft,
In recent years, GPS has been used to transmit radio waves from multiple artificial satellites to confirm or determine their current position, traveling speed, etc.
(Global Positioning System
m) The usefulness of positioning devices is attracting attention.

This GPS positioning device has the following characteristics: ■ It can be used continuously all over the world at any time, ■ It has extremely high accuracy in measuring position and speed, and ■ There is no limit to the number of users. Objects should not be limited to ships and aircraft, but also automobiles. In particular, if it can be used to avoid traffic congestion in urban areas, confirm one's current location in a short time, and find a detour to a destination, it would have significant time and economic benefits. .

As is well known, a positioning method using a GPS positioning device is usually performed by receiving radio waves from three or more artificial satellites. Each of these artificial satellites is equipped with a highly accurate atomic clock, etc., but on the other hand, such an expensive timekeeping device is not installed on the receiving side. Therefore, the time information on the receiving side is information that includes a so-called clock offset, which is converted into distance based on the time difference and the difference in the rate of change of time. Therefore, in the current positioning method, radio waves from multiple satellites are simultaneously received, and pseudorange data including the receiver clock offset between each satellite and the receiving point and orbital position data of each satellite are used. The current position of the receiving point is calculated and displayed. In this case, in the automotive positioning system, this current position information and a large amount of road map information stored in advance are combined and displayed on a display device such as a CRT.

GPS related to conventional technology using this type of positioning system
The receiver is shown in Figure 1. That is, in FIG. 1, reference numeral 2 indicates an initial position data manual section, and the output side of this initial position data input section 2 is connected to an initial position data storage section 4. The output side of the initial position data storage section 4 is branched and connected to the input terminals of the reception measurement section 6 and the position calculation section 8, respectively. An antenna 10 is connected to the other input terminal of the reception measurement section 6, and an output side of the reception measurement section 6 is connected to the other input terminal of the position calculation section 8.

In this case, the output side of the position calculation section 8 is connected to the position display section 12 and also to the initial position data storage section 4.

In the GPS receiver having such a configuration, in order to perform positioning calculations, the user needs to manually input initial position data from the initial position data input unit 2 after turning on the power.

The manually inputted initial position data is stored in the initial position data storage section 4, and is introduced into the reception measurement section 6 and the position calculation section 8 via the initial position data storage section 4. In this state, the reception measurement unit 6 measures multiple G signals (not shown).
The antenna 10 captures radio waves from artificial satellites (hereinafter referred to as GPS satellites) constituting the PS, and selects a combination of three to four GPS satellites that can provide the best positioning accuracy. Radio waves from the GPS satellite selected in this manner are captured and tracked by the reception measurement unit 6, and the orbit data of the GPS satellite is demodulated and the pseudo distance between the satellite and the GPS receiver is measured. The position calculation unit 8 calculates the position data of the receiving point from this trajectory data, the measured value of the pseudorange, and the initial position data, and also combines the position measurement result with, for example, map information (not shown) in the position display unit 12. Display. On the other hand, when the positioning calculation using GPS satellites is started in this way, the calculated position data of the reception point is introduced into the initial position data storage section 4, and is converted into the initial position data manually input when the power is turned on. . Therefore, in subsequent positioning calculations, reception measurement processing and measurement position calculation processing can be executed based on this updated position data.

However, in this type of conventional GPS receiver, in order to receive radio waves from GPS satellites and display positioning results, the user has to collect initial position data every time the user turns on the receiver. There is a drawback in that the initial position data manual work is extremely complicated because it requires manual input. Furthermore, if the user is in a hurry to manually perform the initial position data or enters incorrect initial position data, the display may display an incorrect positioning result, or the positioning result may be inconvenient. There are disadvantages such as it takes a long time to obtain a result, and in the worst case, there is a disadvantage that reception positioning becomes impossible.

[Purpose of the Invention] The present invention has been made to solve the above-mentioned technical problem, and when positioning calculation is impossible for some reason, for example, when the power of the GPS receiver is turned on, The initial position data that has been prepared is configured to be introduced into the GPS receiver by automatic manual operation, thereby making it possible to quickly start executing positioning calculations, and to perform manual positioning (
GPS that makes it possible to avoid manual labor errors as much as possible
The purpose is to provide a receiver.

[Means for achieving the object] In order to achieve the above object, the present invention uses GPS? *Reception measurement means and position calculation means that calculate the position of the reception point from the orbit data of the satellite demodulated by receiving Tesei radio waves, the measured pseudo distance data between the satellite and the reception point, and the initial position data of the reception point. A GPS receiver that displays the output signal of the position calculation means on a display device, comprising: a positioning failure determination means that uses the output signal of the position calculation means as a human signal; a measured position data storage means; and an initial position data generation means. or a switching means for introducing an output signal from any one of the measured position data storage means to the reception measurement means and the position calculation means based on the output signal from the positioning failure determination means. .

Further, the present invention is characterized in that the output signal of the initial position data generating means is a signal corresponding to the center position of the moving range of the moving body carrying the receiver and moving.

Furthermore, the present invention is characterized in that the output signal of the initial position data generating means is a signal corresponding to the center position of the map data displayed on the display device.

[Embodiments] Next, preferred embodiments of the GPS receiver according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 20 indicates a GPS receiver according to the present invention, and as described later, the GPS receiver 20 includes an initial position data generating section 22 in which predetermined initial position data is stored. include. The output side of this initial position data generating section 22 is branched via a virtual electronic switch 26 constituting the initial position data switching section 24, and is branched off to the reception measurement section 2.
7 and the position calculation unit 28. In this case, the electronic switch 26 has a single-pole double-throw configuration, and the first
The output signal of the initial position data generating section 22 is introduced into the terminal 26H, and the output signal of the measured position data storage section 30 is introduced into the second terminal 26b. The signal is switched by the electronic switch 26 based on the control signal and introduced into the reception measurement section 27 and the position calculation section 28 via the common terminal 26C.

On the other hand, the antenna 3 is connected to the other input terminal of the reception measuring section 27.
A radio wave signal from a GPS satellite is introduced through 4, and the output side of the reception measurement section 27 is connected to a position calculation section 28. The first output terminal of the position calculation unit 28 is connected to the positioning failure determination unit 3.
2, and the second output terminal is branched to the position display section 3.
6 and the measurement position data storage section 30.

In this embodiment, the data sent from the position calculation unit 28 to the positioning failure determination unit 32 is binary data of 1 or 0, and when the position calculation unit 28 calculates the position data of the receiving point, High level data 1 is sent to
The configuration is such that low level data 0 is sent when position data is not calculated.

The GPS receiver according to the present invention is basically constructed as described above, and its operation and effects will be explained in detail below with reference to the flowchart of FIG. 3.

First, turn on the power of the GPS receiver 20 (STP 1
). Next, the initial position data generated by the initial position data generating section 22 is sent to the first terminal 26a of the electronic switch 26 constituting the initial position data switching section 24 (SrF2).
. Immediately after the power is turned on, reception and positioning are impossible, so the data introduced from the position calculating section 28 to the positioning impossible determining section 32 is data 0, and therefore, the output signal of the positioning impossible determining section 32 causes the common terminal of the electronic switch 26 to be 26C and the first terminal 26a are connected, and the initial position data generating section 22
The initial position data generated in is sent to the reception measurement section 27 and the position calculation section 28 (SrF2). Therefore, the reception measurement unit 27 uses the introduced initial position data to select the 3rd position that provides the best positioning accuracy among the radio waves captured by the antenna 34.
Select a combination of 4 GPS satellites (SrF
2).

Furthermore, the reception measurement unit 27 receives the satellite signal for each satellite selected in this way, demodulates the orbit data of the satellite, and measures the pseudo distance between each satellite and the reception point. SrF5). Next, the position calculation unit 28 receives the orbit data demodulated by the reception measurement unit 27, the measured pseudorange data, and the initial position data switching unit 24.
The positioning calculation process is performed by substituting the initial position data from the initial position data into a well-known navigation equation (SrF6). When a positioning result is obtained by the positioning calculation process, that is, when positioning is not impossible (SrF2), the positioning data of the calculation result is sent to the position display unit 36, and, for example, it is sent from a map storage unit (not shown). It is combined with the supplied map data and displayed (SrF2). Furthermore, the positioning data resulting from the calculation is introduced into the measured position data storage unit 30 and stored and held (SrF2
). The positioning data held in the measured position data storage section 30 is used as initial position data for the next satellite signal reception positioning calculation, and is transferred to the second terminal 26b and the common terminal of the electronic switch 26 constituting the initial position data switching section 24. 26C
The signal is sent to the reception measurement section 27 and the position calculation section 28 via.

While the positioning results are being obtained continuously in this way, the data level of the human data introduced into the positioning failure determination section 32 is 1, so the second terminal 26b in the electronic switch 26 is The common terminal 26c is maintained in a connected state, and the fourth to first terminals in the flowchart shown in FIG.
Reception and positioning calculations are repeatedly performed in the same operation sequence as the 0-step operation sequence.

However, the positioning calculation (SrF
6) If the specified positioning result is not obtained, for example, the number of GPS satellites that can be received is less than 2 or 3, or the number of receiving satellites is 3 or 4, and the positioning result is not obtained. However, if the predetermined positioning result cannot be displayed on the position display section 36 due to reasons such as poor measurement accuracy due to poor geometrical satellite arrangement, positioning cannot be performed from the position calculation section 28. Data 0 is sent to the determination unit 32. The positioning failure determination unit 32 determines that positioning is impossible based on this data 0 (5TP7), and based on the determination result, the common terminal 26C of the electronic switch 26 is set to the first terminal 26.
Switch to side a. Therefore, if positioning is not possible, etc., the initial position data generated by the initial position data generator 22 will be automatically used as the initial position data used for the next satellite signal reception positioning calculation. becomes. Note that the initial position data generated by the initial position data generation unit 22 may be generated by, for example, the GPS receiver 20
If it is predicted that it will be used only in a specific area, there is a method of storing position data corresponding to the center position of the specific area and generating the center position data as initial position data, or In the case of a configuration in which the display unit 36 displays the road map information stored in a storage medium such as a CDROM and the positioning results in a superimposed manner, position data corresponding to the center position of the displayed road map is used as initial position data. An automatic generation method such as a generation method can be adopted.

[Effects of the Invention] As described above, the GPS receiver according to the present invention uses initial position data generated in advance according to a predetermined procedure for reception positioning calculation when positioning is impossible as determined by the positioning failure determination unit. If positioning is possible, the received positioning calculation is performed using the previous positioning data as initial position data. Therefore, when the power is turned on or when positioning is not possible even after a predetermined period of time has elapsed, the user can automatically input the initial position data without manually inputting the initial position data. This is possible, and the positioning operation can be started immediately.

Thereby, it is possible to avoid as much as possible the complexity of manual operation of initial position data or the erroneous input of data due to the introduction of a GPS receiver.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a general GPS receiver, FIG. 2 is a schematic block diagram of a GPS receiver according to the present invention, and FIG. 3 explains the operation of the GPS receiver shown in FIG. It is a flowchart. 20...GPS receiver 22...Initial position data generation section 24...Initial position data switching section 26...Electronic switch 27...Reception measurement section 28...Position calculation section 30...Measurement Position data storage unit 32--Positioning impossibility determination unit 34--Antenna 36--Position display unit

Claims (3)

[Claims] (1) Receiving measurement means and position for calculating the position of the receiving point from satellite orbit data demodulated by receiving GPS satellite radio waves, measured pseudorange data between the satellite and the receiving point, and initial position data of the receiving point. a calculation means, and displays an output signal of the position calculation means on a display device, a positioning failure determination means that receives the output signal of the position calculation means as an input signal, a measured position data storage means, and initial position data. It is characterized by comprising a switching means for introducing an output signal of either the generation means or the measured position data storage means into the reception measurement means and the position calculation means based on the output signal of the positioning failure determination means. GPS receiver. (2) In the receiver according to claim 1, the output signal of the initial position data generating means is a signal corresponding to the center position of a moving range of a moving body carrying the receiver and moving. Receiving machine. (3) A GPS receiver according to claim 1, wherein the output signal of the initial position data generating means is a signal corresponding to the center position of the map data displayed on the display device.