JPH05300041A - Drive control device for drive satellite antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] A part of the memory part, which is a component of this device,
The present invention relates to a drive satellite antenna drive control device that achieves the same function by using an EEPROM instead of a conventionally used RAM. [Structure] The EEPROM 2 (nonvolatile memory) has its memory area divided into 6 blocks, each of which has a role. RAM3 (volatile memory) is an actuator
It is used as a counter for the feedback pulse 42 from 41 and a memory for the data. The CPU 1 reads / writes data from / to each of the memories, controls the motor drive controller 46, and sets the antenna in a predetermined direction.
On the other hand, when the power supply (B2) is turned off, the memory data in the RAM 3 is lost, and in this case, the data before the loss is restored from the memory data in the EEPROM 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention replaces a conventionally used RAM as a part of a memory portion which is a constituent element of the present invention,
The present invention relates to a drive control device for a drive satellite antenna that achieves the same function by using an EEPROM.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a main part of an embodiment of a drive control device for a conventional drive satellite antenna. Hereinafter, the principle of driving the antenna will be briefly described with reference to FIG.
In the figure, 41 is a pulse generator (not shown) for driving the antenna in a designated direction and according to the driven angle.
Generates a pulse 42 and feeds it back to the CPU 47, 43 is a motor as a driving power source, 44
Is an antenna reflector, 45 is a frequency converter, 46 is a CPU
A motor drive control unit for supplying drive power to the motor 43 under the control of 47 to rotate the motor forward, reverse, or stop, 47 is a CPU, 48 is a memory of a pulse number corresponding to each satellite, and an antenna is being driven. A RAM 49 for writing a pulse to be fed back is a backup power source. There is a certain relationship between the antenna drive angle (azimuth angle) and the number of pulses generated in association with the drive. For example,
Like 18 pulses / 4 degrees. However, this relationship differs depending on the type of antenna. The starting point (reference point) of counting the number of pulses is the starting point of the antenna driving range. The satellite position is stored by presetting the number of pulses having the above relationship in the RAM 48 for each satellite. Thereafter, when the satellite is designated, the feedback pulse 42 is once written in the RAM 48. The number of written pulses is counted, and the number of written pulses is compared with the preset number of pulses. Since the antenna is driven in two directions (right or left), the motor also needs to be switched between normal rotation and reverse rotation. This switching is performed by the CPU 47 controlling the motor drive controller 46 to determine the polarity of the power supply to the motor 43.

[0003]

As described above, in the prior art (FIG. 5), a RAM was used as a memory for the number of pulses that serves as a reference for satellite position setting. This RAM has the drawback that the memory disappears once the power is turned off, so a backup power supply 49 (FIG. 5) is provided to cover this drawback. Therefore, the cost is increased by the backup power source. In consideration of the above-mentioned drawbacks of a RAM, the present invention provides a drive control device for a satellite antenna for a drive satellite, which does not lose the memory even when the power is turned off and therefore uses an EEPROM that does not require a backup power source instead of the RAM. The purpose is to do. Note that the EEPROM has a limit on the number of times it can be written, from the viewpoint of life.

[0004]

According to the present invention, in the drive type satellite antenna, the memory for updating the memory is updated every time the receiving satellite is changed by driving, and the memory for the data representing the satellite and the receiving satellite is changed by the driving. While updating the memory, a memory for the approximate position data of the antenna, a memory for whether the driving direction by the antenna drive command is to the right or left with respect to the current position, a memory for the number of pulses corresponding to each preset satellite, and reception An EEPROM that serves as a memory for the data representing the target satellite and a memory for whether the antenna drive control device is currently operating or stopped, and a RAM that serves as a memory for counting the number of pulses during antenna drive and for the count data. , The EEPR based on the input antenna drive command and the C / N level and the feedback pulse from the pulse generator A drive control device for a drive satellite antenna, which comprises a CPU that controls writing and reading of OM and RAM, and the CPU sets the antenna to a specified azimuth angle via the motor drive control unit. is there.

[0005]

As described above, the EEPROM is provided with 6 blocks in its memory area, and each is assigned a role. Also, R
The AM is used as a counter for feedback pulses and a memory for its data. The CPU reads and writes data in each of the above memories, and sets the antenna in a predetermined direction while controlling the motor drive control unit. On the other hand, when the power is turned off, the memory data in the RAM is lost. In this case, the data before the loss is restored from the EEPROM data.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drive control device for a drive satellite antenna according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a main part showing an embodiment of a drive control device for a drive satellite antenna according to the present invention, FIG. 2 is a diagram showing a specific example for explaining the following operation, and FIG. (B) shows Example 2. 3 and 4 are flowcharts for explaining the operation. In FIG. 1, the same components as those in FIG. 5 are designated by the same reference numerals, 1 is a CPU, and 2 is an EE as a nonvolatile memory.
PROM and 3 are RAMs as volatile memories. According to the present invention, as described above, the central part of the memory unit is the conventional RA.
Although M is changed to EEPROM and the backup power supply is deleted, in this case, the following problems to be solved arise. (1) The EEPROM has a limit in the number of times of writing, that is, has a life. In RAM, such a limit need not be considered. Therefore, it is necessary to minimize the writing contents and the number of times. (2) Due to the limit of the number of times of writing described above, RAM is used for counting feedback pulses from the actuator during antenna driving and for storing the count data, but since the backup power supply is deleted, it is possible to use the RAM during antenna driving. When the RAM power is turned off, the current position of the antenna becomes unknown. EE to solve the above problems
Prepare 6 blocks in the PROM memory area. Then, the satellite preset before normal use is stored in the memory area (memory 4) of the fourth block by the same method and operation as the conventional one.

Next, the operation of the present invention after the preset will be described separately for each example. (1) Description of Example 1 [FIG. 2 (A)] FIG. 2 (A) shows an example in which the azimuth position of the antenna currently in the azimuth of the satellite 1 is driven to the satellite 5. The same figure (a)
Shows the satellite position in Japan (as of January 1992), satellites 1 to 4 are CS (communication satellites), 1 is Super Bird B, 2 is Super Bird A, 3 is JC-SAT2,
4 is JC-SAT1. The satellite 5 is BS (satellite broadcast). Angles are in the “East longitude” position, 4 ° apart. Since the space between the satellites 4 and 5 is wide, during this period, imaginary positions A to I (4 degrees apart) are provided as shown in the figure.
Use as a checkpoint. The same figure (b) shows the C / N level of the received radio wave, which is used to confirm the reception of the satellite. The C / N level utilizes that generated in the receiving circuit block (not shown). Figure (C) shows EEPR
Shows the memory contents of OM2 and RAM3, especially EEPROM
For 2, 6 blocks in the memory area (memory 1
6) is prepared. The memory 1 is an area for storing the latest received satellite, and updates the satellite to be stored each time the receiving satellite changes due to antenna driving. The C / N level of (b) is used to determine whether or not a satellite has been received. The memory 2 is an area in which the approximate position of the antenna is updated to the latest position in accordance with the driving and is stored in the same manner as the memory 1, and includes not only satellites 1 to 5 but also imaginary positions of A to I. When driving the antenna, the memory 3 is a region for storing in which direction the current position is driven, that is, the right direction or the left direction, and follows the determination and control of the CPU.

The memory 4 is an area for storing the antenna azimuth position of each satellite as pulse number data corresponding to each satellite by presetting. The memory 5 is an area for storing a satellite to be newly set based on a user's designation operation (input operation unit 4). The memory 6 is an area for storing whether the antenna drive is currently operating or stopped, and reproduces the current position of the antenna (explained in Example 2) that becomes unknown when the power supply (B2) is turned off. At this time, the memory data in this area is used. The memory 7 is the RAM 3 itself, and has a role of counting the number of pulses 42 fed back from the actuator 41 during the driving of the antenna and keeping track of the current position being driven and storing it.

When the antenna is driven from satellite 1 to satellite 5, it operates as follows. The ST numbers in parentheses in the following represent each step in FIG. First, the CPU 1 sets the memory 3 to “right”, the memory 5 to “satellite 5”, and the memory 6
Are set to "in operation" (STEP) (ST)
1). While counting the pulses in the memory 7, (ST
2), drive control of the actuator 41 via the motor drive control unit 46 (ST3). In addition, CPU1 is memory 2
Confirm that the data of satellites are from satellites 1 to 4 (ST4
-YES), when passing through satellite 2, update the current data "satellite 1" in memory 1 to "satellite 2" and the current data "satellite 1" in memory 2 to "satellite 2" (ST5) The preset data of the satellite 5 is read from the memory 4, and the data is compared with the pulse count data in the memory 7 to determine whether the target satellite previously written in the memory 5 has been reached (ST6). At this time point, the comparison judgment is "mismatch", and the drive is continued (ST6-N
O). Even when the satellites 3 and 4 are passed, the data in the memories 1 and 2 are updated to the passed satellites, while the above comparison and determination are performed (ST2 to 6). A after passing through satellite 4
The satellite itself does not exist during I (4 degree interval), and memory 2
Data is not for satellites 1 to 4 (ST4-N
O). Therefore, it is assumed that each point has passed after the number of pulses corresponding to 4 degrees (18 pulses) has been counted, and the data in memory 2 is updated (ST7) (memory 1 remains "satellite 4"). In this way, "Satellite 5"
(ST6-YES), set memories 1 and 2 to "satellite 5" and set memory 6 to "stop" (ST8).

(2) Description of Example 2 [FIG. 2 (B)] As described above, since the memory 7 is a RAM, the power source (B
If 2) is turned off for some reason, the RAM
The memory data of is lost and the current position of the antenna cannot be known. In this case, when the power supply (B2) is restored, the following treatment is performed depending on whether the power is off while the antenna is being driven or is being stopped. The ST numbers in parentheses in the following represent each step in FIG. When the power is turned off while the antenna drive is stopped It can be determined from the data of the memory 6 whether the antenna is stopped or operating. That is, the CPU 1 reads the memory 6 (ST11),
Read that the result was stopped (ST12-N
O). In this case, the antenna position immediately before the power is turned off is stored in the memories 1 and 2 as can be seen from the above description of the example. Therefore, the CPU 1 has the memory 1 or 2
The current position is read from (ST13), the corresponding position data is read from the memory 4 (ST14), and set (written) in the memory 7 (ST15). As a result, the memory 7 in which the data has been lost is restored to the state before the power was turned off, and returns to the normal state. When the power is turned off during the operation of driving the antenna As shown in FIG. 2 (B), it is assumed that the power is turned off at the point (a) when passing through the satellite 2 while moving from the satellite 1 to the satellite 5.

First, the CPU 1 reads from the memory 6 that the antenna drive is in operation in the same manner as (ST12-YES). Next, the direction in which the antenna was moving is read from the memory 3 (ST16). Furthermore, the antenna position immediately before the power is turned off is read from the memory 2 (ST17). From the above, it can be read that the antenna was between the satellites 2 and 3 and was moving to the right. Therefore, take the route of (ST18-YES). Further, the distance from the satellite 1 to the satellite 5 is 4 degrees, and if the antenna is driven to the right by a maximum of 18 pulses due to the relationship of 18 pulses / 4 degrees (ST19), the satellite 3 can receive during that period. When the satellite 3 can receive, the preset data is read from the memory 4, set in the memory 7, and the data in the memory 7 is restored (ST20). As a result, all the memories are restored to the normal state before the power was turned off, and the operation returns to the operation of Example 1 (FIG. 3 *), and the antenna is driven and controlled up to the target satellite 5 (memory 5) (FIG. 3). ). If the power is turned off between satellites 4 and 5, the above y pulses are driven before the above
Perform the same processing as ST19 and later (ST18-NO-ST21-ST19 and Figure 3 *). y = (9−x) × 18 (pulse) [However, x is the satellite 4
= 0, A = 1, B = 2 or less, incremented by 1, and I = 9 is substituted. ]

[0012]

As described above, according to the present invention, when a RAM which is generally a volatile memory is conventionally used as a memory in the present apparatus, an EEPROM which is a non-volatile memory can be used. The backup power supply provided to prevent the memory loss can be deleted, and the technical effect of reducing the cost and maintaining the same function is achieved.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part showing an embodiment of a drive control device for a drive satellite antenna according to the present invention.

FIG. 2 is a diagram showing a specific example for explaining the operation of the present invention.

FIG. 3 is a flowchart for explaining the operation of the present invention [corresponding to FIG. 2 (A)].

FIG. 4 is a flowchart for explaining the operation of the present invention [corresponding to FIG. 2 (B)].

FIG. 5 is a block diagram of essential parts showing an embodiment of a conventional drive control device for a drive satellite antenna.

[Explanation of symbols]

 1 CPU 2 EEPROM 3 RAM 41 Actuator 43 Motor 46 Motor drive controller 47 CPU 48 RAM 49 Backup power supply B1 power supply B2 power supply

Claims (1)

[Claims] 1. A motor for driving an antenna in a designated azimuth by a power supply supplied through a motor drive control section controlled by a CPU, and a pulse generator for generating a number of pulses according to a driven angle are provided. In a driving satellite antenna equipped with an actuator, a memory of data representing a satellite is updated while the receiving satellite is changed by the driving, and a schematic position data of the antenna is updated when the receiving satellite is changed by the driving. Memory, whether the driving direction according to the antenna drive command is to the right or left with respect to the current position, the memory of the number of pulses corresponding to each preset satellite, and the memory of the data representing the satellite to be received. , EEPROM which is a memory of whether the antenna drive controller is currently operating or stopped, and the number of pulses during antenna drive And a RAM that forms a count of the count and a memory of the count data, and the EEPROM and the RAM based on the input antenna drive command and the C / N level and the feedback pulse from the pulse generator.
A drive control device for an antenna for a drive satellite, comprising a CPU that controls writing and reading, and the CPU sets the antenna to a specified azimuth angle via the motor drive control unit.