JPS59169230A - Command generator - Google Patents

Abstract

PURPOSE:To simplify the command transmission procedure of the command side and to reduce the hardware quantity of a circuit scale, by changing the command matrices of two systems into one system and collecting the command data into a system before decoding them. CONSTITUTION:A command data discriminating circuit 4 of a command generator identifies a real time command and a program command to switch them between two systems. The real time command is stored in a memory 5. A command data switching circuit 6 switches the real time command given from the memory 5 and the program command given from the circuit 4 to the command of a single system under the control of a control part 7. In this case, the circuit 6 controls the output timing of the program and real time commands respectively. Then the command data are collected to a single system before they are decoded by a decoder 8 and then single system before they are decoded by a decoder 8 and then simplified in accordance with the command procedure of the command side. Thus the constitution of the circuit 4 is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a command generator that generates two systems of commands with different command output timings. Such command generators are primarily suitable for electrical circuits for satellites.

[Description of prior art]

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 mXn 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 FIG. 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 that controls the operation timing of decoder 1' and memory 2. .

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 number of interface circuits.

[Purpose of the invention]

The present invention solves the above-mentioned drawbacks. For example, when the present invention is applied to a command generator of an artificial satellite,
The purpose of the present invention is to provide a command generator that can simplify the command data creation procedure at a ground station and reduce the decoder circuit size, command signal line, and command rain face circuit in an artificial satellite by half.

[Key points of the invention]

The present invention commonizes one type of command matrix, and
Switch the command data of one system to one for real-time commands and one for program commands, and when outputting commands, control so that the above two commands are not output at the same time, switch to command data of one system, and output the command data of one system. A method is adopted in which commands are sent to each device using a decoder.

The present invention is characterized by: an identification circuit that distributes command data of one system of (m+n) focus to two systems, including two systems of commands with different output timing; a memory that stores the command data; a command data switching circuit that combines the command data of each system into one system;
The device is configured to include a control section including a function to control the commands of each system so that they are not output at the same time, and a decoder that decodes data from the command data switching circuit.

[Explanation based on examples]

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, 4 is a command data identification circuit that identifies real-time commands and program commands and switches between the two systems, 5 is a memory for storing program commands, and 6 is a circuit that identifies two systems of command data: real-time commands and program commands. A command data switching circuit 7 controls the writing and reading of program commands into memory, and also controls the output timing of program commands and real-time commands by the command data switching circuit 6 to prevent crosstalk with real-time commands. A control unit that controls
8 is a decoder.

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

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

In the satellite, this data is sent to the command data identification circuit 4.
The identification circuit 4 identifies real-time commands and program commands, and outputs the commands to the memory 5 and the command data switching circuit 6. This memory 5 is a memory for storing automatic control commands (program commands), and commands in which a series of sequences are programmed are written by the control unit 7. Command data output asynchronously from the command data identification circuit 4 and the memory 5 are combined into an input system by the command data switching circuit 6. The control unit 7 has the function of controlling the writing of program commands, controlling the timing for reading and executing program commands, and controlling the command data switching circuit 6 so that program commands are not output at the same time as real-time commands. . (2) The systemized command data is decoded by the decoder 8 and sent to each device inside and outside the command generator.

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 treated as the same command. This simplifies the procedure for transmitting command data on the ground, and the decoder section on the satellite Since there is only one system, 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 ink face 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 identification circuit, 5... Memory, 6... Command data switching circuit, 7... Control unit, 8... decoder.

Claims (1)

[Claims] +11 An identification circuit that distributes and outputs command data including two types of commands, first and second, with different output timings to two systems; and a storage circuit for storing; a switching circuit for switching the circuit so as to output either the first command input from the storage circuit or the second command input from the identification 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.