JPS6340058B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides two
This invention relates to a command generator that generates system commands. Such command generators are primarily suitable for electrical circuits for satellites.

[Conventional technology]

Artificial satellite commands mainly include real-time commands for immediately executing commands from the ground, and program commands for automatically controlling the satellite. The command is an m×n item command consisting of an (m, n) array and is sent from the ground as (m+n) bit data. Conventionally, this command matrix was set separately for real-time commands and program commands, and on the satellite, two systems of command generators corresponding to the above two types of commands were installed as shown in Figure 1, and command data was individually set. It decodes and sends commands to each device at predetermined timing. In Figure 1,
1 is a decoder for real-time commands, 1' is a decoder for program commands, 2 is a memory for storing program commands, and 3 is a control unit for controlling the operation timing of decoder 1' and memory 2.

[Problem that the invention seeks to solve]

A command generator with such a configuration has the following drawbacks.

(1) There are two types of command matrices, which complicates the command data creation procedure on the ground.

(2) Since there are two types of decoders, the circuit scale becomes large, and a large number of command signal lines to be sent to each device are inevitably required.

(3) Since there are two systems of command output, in each device receiving the command, if each command has the same function, it is necessary to perform a logical sum of the commands of the two systems, which increases the interface circuit.

The present invention solves the above-mentioned drawbacks,
For example, if the present invention is applied to a command generator of an artificial satellite, the command data sending procedure at the ground station can be simplified, and the circuit size of the decoder, command signal line, and command interface circuit of the artificial satellite can be halved. The purpose is to provide a command generator that can.

[Means for solving problems]

The present invention standardizes one type of command matrix, switches one system of command data for real-time commands and program commands,
Furthermore, when outputting commands, control is performed so that the above two commands are not output at the same time, and one
A method is adopted in which the command data is switched to one system and the commands are sent to each device using one system of decoders.

The present invention is characterized by a selection switching circuit that distributes one system of (m+n)-bit command data including two systems of commands with different output timings to two systems, a memory for storing the above command data, and The configuration includes a command data switching circuit that combines command data of the systems into one system, a control section including a function to control so that the commands of each system are not output at the same time, and a decoder that decodes the data from the command data switching circuit. It lies in being done.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram showing an apparatus according to an embodiment of the present invention.

In FIG. 2, numeral 4 is a command data selection switching circuit that switches the output between real-time commands and program commands into two series according to a selection control signal, 5 is a memory for storing program commands, and 6 is a real-time command and a program command. Command data of two types of program commands are combined into one
A command data switching circuit 7 controls writing and reading of program commands into memory and prevents crosstalk with real-time commands from occurring.
A control unit 8 is a decoder which controls the output timing of program commands and real-time commands, and the decoder output is led to the command data selection switching circuit 4 as a selection control signal 10 and also to the control unit 7.

The operation of the apparatus of this embodiment will be explained below.

Command data is unified into one type of command matrix of m×n items consisting of a common (m, n) array for both real-time commands and program commands, and is sent from the ground to the satellite as (m+n) bit command data. .

In the artificial satellite, this data is input to a command data selection switching circuit 4, which selects a real-time command and a program command using a selection control signal 10, and stores the data in a memory 5 and a command data switching circuit 6. The output destination can be switched. Identification of whether this is a real-time command or a program command is determined by a command that is assigned to a predetermined item of m×n items and instructs which type of command data will be sent after that command is sent. conduct. This command is decoded by the decoder 8, and a selection switching instruction is given to the command data selection switching circuit 4 by the selection control signal 10. Based on this instruction, the program command data is stored in the memory 5, and the real-time command data is stored in the memory 5. The output destination is switched to the command data switching circuit 6 and outputted.

The memory 5 is a memory for storing automatic control commands (program commands), and the control unit 7 writes commands in which a series of sequences are programmed.

Command data selection switching circuit 4 and memory 5
The command data output asynchronously from the command data switching circuit 6 is combined into one system. The command data switching circuit 6 is a circuit that switches input depending on whether the command to be output is a real-time command or a program command, and outputs either one of the command data to the decoder 8. Since both commands are input asynchronously, it is necessary to control so that both commands are not selected at the same time, and control and management of input command data switching is performed by control signals from the control section 7.

The control unit 7 controls writing of program commands to the memory 5 and timing control for reading and executing the program commands, and also controls the command data switching circuit 6 so that the program commands are not output at the same time as real-time commands.

When writing a program command from the ground to the memory 5, as described above, by sending a command indicating that the subsequent command is a program command, the command data selection switching circuit 4 is activated by the selection control signal 10 from the decoder 8. A command is issued to output the program command to the memory 5, and at the same time as the data is output from the command data selection switching circuit 4 to the memory 5, the control section 7 outputs a write control signal to the memory 5 to output the program command. Write control is performed. Further, when performing automatic control of the satellite, a command to that effect sent from the ground is sent to the control unit 7 via the decoder 8 to issue a command and start an automatic control sequence. Upon activation of the automatic control sequence, the control unit 7 sends out a read control signal to the memory 5 at predetermined programmed time intervals, reads out the program command, and also transfers the input circuit of the command data switching circuit 6 to the memory 5. control to send data to the decoder 8 and generate a program command. The control unit 7 also controls the timing of real-time commands and program commands so that crosstalk of commands such as when a real-time command and a program command are selected simultaneously in the command data switching circuit 6 does not occur.

The command data collected into one system by the command data switching circuit 6 is decoded by the decoder 8 and sent to each device inside and outside the command generator. The decoding result of the command for discriminating between the real command and the program command described above is led from the decoder 8 to the command data selection switching circuit 4 as the selection control signal 10, and the decoding result of the command to perform automatic control is as follows. It is guided to the control section 7.

In this way, the device of this embodiment uses one type of command matrix in common, so that real-time commands and program commands can be handled as the same command, which simplifies the procedure for sending command data on the ground, while on the satellite. Since there is only one decoder section, there is an advantage that the circuit scale of the decoder, the command signal line, and the command interface circuit can be halved, which also contributes to weight reduction.

〔Effect of the invention〕

As explained above, in the present invention, the command matrix of two systems is made common to one system, and by adopting a method of combining command data into one system before decoding, command data can be transmitted on the command side (ground). In addition to simplifying the procedure, it is possible to significantly reduce device hardware such as the decoder circuit scale, command signal line, and command interface circuit scale. When mounted on an artificial satellite, this greatly contributes to reducing the weight of the device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional command generator. FIG. 2 is a block diagram of a command generator according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Decoder, 2...Memory for program commands, 3...Control unit, 4...Command data selection switching circuit, 5...Memory, 6...Command data switching circuit, 7...Control unit, 8... Decoder, 1
0...Selection control signal.

Claims (1)

[Claims] 1. A selection switching circuit that distributes and outputs command data including two types of commands, first and second, with different output timings to two systems; and a memory circuit that stores commands; and a switching circuit that switches the circuit to output either the first command input from the memory circuit or the second command input from the selection switching circuit. A command generator comprising: a decoder that decodes output data of the switching circuit; and a control circuit that controls writing and reading of the storage circuit and controlling switching timing of the switching circuit.