JPH0786997A - Command processor - Google Patents

Abstract

PURPOSE:To immediately execute an emergency command. etc. CONSTITUTION:A command for satellite processing is transmitted from a ground station side by attaching the execution priority order information of the command, respectively. A satellite side holds the command received from a ground station at the prescribed address of a command buffer 3. The execution priority order information attached on the command is held with a priority order generating part 4 forming a pair with the address of the buffet 3. The content held with the generating part 4 is compared with that held with a priority order register 5, and it is stored in the register 5 corresponding to an order to be executed. The address is designated from a command output part 14, and the command is read out from the buffer 3, then, it is executed. Therefore, the emergency command can be executed preferentially than another command by transmitting from the ground station side by attaching the priority order, which prevents a trouble in the operation of a satellite from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a command processing device, and more particularly to a command processing device for executing a command from a ground station on a satellite.

[0002]

2. Description of the Related Art Generally, artificial satellites are equipped with command decoders, which decode and output commands from ground stations and execute the commands. The command types include a satellite attitude control command and a power on / off control command for devices in the satellite.

Conventionally, a command decoder outputs data in the order of command input. Therefore, when there are a plurality of ground stations, that is, command generation sources, commands are output in order in a time division manner regardless of the types of generation sources. In addition, ground stations generally have a housekeeping station that maintains and controls satellites and a mission station that uses satellites. Prioritize these command sources and assign commands from command sources with high priority. Priority is running.

[0004]

When the above command decoder is mounted on a satellite, command data from a plurality of command generation sources are output in the order of generation, so that conflicting commands are generated from each command generation source. In that case, there is a drawback in that if it is executed as it is, a large disturbance may be added to the operation of the satellite.

Further, even if the command generation sources are prioritized, there is a drawback in that it may take time to execute an urgent command from the viewpoint of satellite operation.
In other words, even if a command that is urgent for satellite use is generated, if a command from another command source with a higher priority has already been input and buffered, that command will be output. There was a drawback that it could not execute urgent commands and affected the entire satellite.

As a solution to these drawbacks, there is a countermeasure to provide a dedicated line for emergency commands, but in that case, there are other drawbacks such as an increase in cost and weight due to an increase in interfaces, and a more effective solution. Was desired.

The present invention has been made in order to solve the above-mentioned conventional drawbacks, and its purpose is to provide a command having a flexible execution sequence of commands, such as a command which can be executed urgently can be preferentially executed. It is to provide a processing device.

[0008]

A command processing device according to the present invention adds execution priority information of a command to a command for satellite processing provided in each of N (N is a positive integer) ground station. And a command executing means for executing the command in accordance with the content of the priority order information provided in the satellite.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the main parts of an embodiment of a command processing device according to the present invention. In the figure, the command processor according to the embodiment of the present invention is
It receives commands from two ground stations and decodes them on the satellite. The configuration shown is to be installed on the satellite side, and commands from the ground station 12,
The command input ports 1 and 2 for receiving the command 13, the command buffer 3 for holding the command data in the command at a predetermined address, the priority information 8 and 9 in the command, and the command store address 10 from the command buffer 3 are paired. And a priority generation unit 4 for latching.

On the satellite side, the command priority order stored in the priority order register 5 and the command priority order latched in the priority order generation section 4 are compared and sorted to determine the command execution order. A control device (not shown) for generating the command address request signal 16 is generated to obtain the store address 7, and the command data 15 is read and output based on the command address. Command output part 1
4 is included.

In such a configuration, the ground station adds a priority to the command and transmits it to the satellite side.

On the satellite side, commands from each ground station
It is input to the corresponding command input port 1 or 2. That is, each of the commands 12 and 13 to be input is provided with a command priority identification bit indicating the execution priority of the command, and the command data 6, 7 and the command priority in the command input port 1 and the command input port 2 are added. After separation into 8 and 9, they are output to the command buffer 3 and the priority generation unit 4, respectively. The command buffer 3 outputs the command store address 10 to the priority generation unit 4 at the same time when the command data 6 and 7 are input.

The priority generation unit 4 latches the command priority levels 8 and 9 from the command input ports 1 and 2 and the command store address 10 from the command buffer 3 in pairs. After this latching, the priorities of the commands already stored in the priority register 5 and the priorities of the latched commands are compared and sorted. And
The execution priority of the latched command is determined, and the command priority and address 11 are stored in the priority register 5. Therefore, the command swirl addresses are sorted and stored in the priority order register 5 in the order of execution order.

Regarding the command address stored in the priority register 5, the command address request signal 16 from the command output unit 14 triggers the command output unit 14 to have the highest execution priority as the command store address 17. Is output. Command output unit 14
Then, the input address data is output to the command buffer 3 as the command store address 19, the command data 15 is read, and the command data 18 is output. As a result, the command is executed.

Next, the priority information added to the command will be described. First, the priority level can be set according to the type of command. For example, if three levels of priority are defined, low level or intermediate level priority information is added to normal commands, and high level priority information is added to commands that need to be executed urgently. Commands that are urgently needed can be executed before other commands.

Further, the priority of the command transmitted from the housekeeping station maintaining and controlling the satellite is set higher than the priority of the command transmitted from the mission station utilizing the satellite. As a result, even if there is a possibility that the operation of the satellite may be hindered, it is possible to recover quickly. In other words, the command processing device of this embodiment sorts the buffered commands according to the command priority information added to the commands, determines the execution order in the order of priority, and stores it in the command buffer. The order of command execution can be finely controlled by the priority information added in. Therefore, a command that needs to be executed urgently can be executed immediately by adding a high priority and giving the highest priority.

Further, by configuring so that a predetermined threshold value can be set and by executing only the command to which the priority order having a higher priority order than the threshold value is executed, the execution of the command having a low priority order can be suppressed. Furthermore, by setting the priority order according to the command generation source and the content of the generated command, it is possible to prevent the execution of conflicting commands due to the mixture of a plurality of commands having different generation sources. It should be noted that the threshold may be set externally, for example, by setting it with a command.

In this embodiment, the case where the number of command generating sources is two has been described, but it is clear that the number of command input ports can be increased even if the number of command generating sources is three or more.

[0020]

As described above, according to the present invention, it is possible to immediately execute an emergency command on the satellite by adding the execution priority information of the command to the command and transmitting it from the ground station. This has the effect that commands can be executed flexibly regardless of the transmission order.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a command processing device according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 command input port 3 command buffer 4 priority generation unit 5 priority register 14 command output unit

Claims (4)

[Claims] 1. A command transmitting means provided in each of N ground stations (N is a positive integer) for transmitting satellite processing commands with execution priority information of the command added, and command transmitting means provided in the satellite. A command processing device, comprising: a command execution unit that executes the command according to the content of the priority order information. 2. The satellite has a holding unit that holds a command received from the ground station at a predetermined address, and an address that specifies an address where a command with a high priority is held according to the content of the priority information. 2. The command processing device according to claim 1, further comprising a designating unit, wherein the command in the holding unit designated by the address designating unit is executed. 3. The command processing device according to claim 1, wherein the command executing means executes only a command to which a priority higher than a predetermined threshold is added. 4. The priority information is set such that a priority of a housekeeping station that maintains and controls the satellite is higher than a priority of a mission station that uses the satellite. The command processing device according to 1 or 2.