JP2001213400A - Artificial satellite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an operator's burden in the control of an artificial satellite to permit safer and more reliable command operation. SOLUTION: A telemetric command part (TTC) 1 of this artificial satellite 100 is provided with a scheduler means 12a and a command operation distributing means 12b. The distribution time of a system control command is determined by the scheduler means 12a according to the characteristics of sub-systems 2-1-2-n, and the system control command is supplied to each of the sub-systems 2-1-2-n on the basis of the determined distribution time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial satellite, and more particularly to a command operation technique using a system control command from a ground control system.

[0002]

2. Description of the Related Art In a conventional satellite control system, when necessary, a command is transmitted to a satellite each time to perform various controls. By the way, in sending a command, operations such as setting up a ground station configuration, controlling the pointing of an antenna to a satellite, and turning on / off an uplink are required. For this reason, especially when a large number of commands are to be sent, the burden on the operator is increased, and it has been difficult to realize safe and reliable operation.

In some cases, it is not possible to send a command at a desired timing due to weather conditions (for example, a line cannot be secured due to a typhoon or rainfall), complication of command operation during simultaneous operation of a plurality of satellites, or failure of ground equipment. In such a case, it is necessary to redo the above work each time, so that the burden on the operator is further increased.

[0004]

As described above, in the conventional satellite control system, a command is sent to the satellite each time it becomes necessary, so that the burden on the operator is large, and safe and reliable operation is performed. It was difficult to realize.

[0005] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an artificial satellite capable of reducing a burden on an operator in controlling the artificial satellite and thereby enabling safe and reliable command operation.

[0006]

In order to achieve the above object, the present invention comprises a plurality of subsystems for autonomously controlling the functions assigned to them by receiving a system control command, and a ground control system. Command receiving means for receiving and demodulating the transmitted command signal, and when the demodulated output from the command receiving means includes the system control command, the system control command should be individually distributed to the plurality of subsystems Scheduler means for determining a time in accordance with the characteristics of each subsystem; and command distribution means for individually applying the system control command to the plurality of subsystems in accordance with the distribution time determined by the scheduler means. I did it.

By taking such measures, the time at which a system control command should be given to each subsystem is determined on the artificial satellite side according to the characteristics of each subsystem. A system control command is given to each subsystem according to the determined distribution time, and each subsystem autonomously executes control in response to the command.

That is, since the time at which each subsystem operates is managed autonomously on the artificial satellite side, there is no need to send a command from the ground side every time it becomes necessary. As a result, for example, it is possible to set an operation schedule such that access to the artificial satellite is not required for one week, and the time flexibility of command operation is increased. As a result, a margin is provided for the operator, and safe and reliable satellite operation can be realized without fear of erroneous operation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the artificial satellite according to the present invention. The artificial satellite 10 shown in FIG.
0 is a telemetry command unit 1 having an antenna 200
And subsystems 2-1 to 2-n that operate in accordance with commands given from the telemetry command unit 1. Each of the subsystems 2-1 to 2-n is, for example, a power supply subsystem, an attitude subsystem, an ion engine subsystem, or the like. The control items in the power supply subsystem include battery charge control and the like. The control items in the attitude subsystem include momentum management and control for shifting to the safety mode. Control items in the ion engine subsystem include valve control and the like.

The command processing unit 12 performs integrated management of the subsystems 2-1 to 2-n by a so-called stored command system. That is, the system control command is delivered to each of the subsystems 2-1 to 2-n after the delivery time is controlled by the scheduler 12a.

Next, the operation in the above configuration will be specifically described. The command signal transmitted from the ground station (not shown) reaches the antenna 200 of the artificial satellite 100 and is received and demodulated by the command receiver 11 in the telemetry command unit 1. The demodulated command signal is provided to the command processing unit 12.

In the command processing section 12, commands corresponding to "system control" and other commands are sorted. Among them, a command corresponding to "system control" is given to the scheduler 12a.

A command corresponding to "system control" (hereinafter, referred to as a system control command) includes a command,
This command is used to control the execution of the sequence from the satellite control system side. For example, operation items that are meaningful with a single command, operation items for which a command sequence is not established, operation items that are not closed by a single subsystem, or operation items that require intervention by a ground-side control system, etc. Therefore, it is not appropriate to use each subsystem 2-1 to 2-n as a unit. Therefore, it is desirable to realize these operation items by giving commands from the system side. That is, it is desirable to perform system control.

In addition, operation items that are established as a sequence and are closed by a single subsystem but require the intervention of a ground station at the current technical level (control start time of orbit control, control of injection time, etc.) ), But system control is also performed for these.

Now, the scheduler means 12a to which the system control command has been given is connected to each of the subsystems 2-1 to 2-2.
-N each of the subsystems 2-1 to 2-2 according to the characteristics of
The distribution time of the system control command to be distributed to −n is determined, and this distribution time is notified to the command distribution means 12b.

The command distribution means 12b distributes a system control command to each of the subsystems 2-1 to 2-n according to the notified distribution time. Each subsystem 2-1 to 2
-N executes the command from the system control command delivered at the delivery time determined by the scheduler 12a.

As described above, according to the present invention, the scheduler means 12a and the command operation delivery means 12b are provided in the telemetry command section (TTC) 1 of the artificial satellite 100, and the delivery time of the system control command is set to the scheduler means 12
According to a, it is determined according to the characteristics of each of the subsystems 2-1 to 2-n, and a system control command is given to each of the subsystems 2-1 to 2-n based on the determined distribution time.

With this configuration, the timing at which a command should be given to each of the subsystems 2-1 to 2-n can be autonomously generated on the artificial satellite 100 side. As a result, it is possible to send a command a plurality of times in the past, instead of sending the command a single time, for example. As a result, the temporal flexibility of command operation can be increased. As a result, the burden on the ground operator can be remarkably reduced, and reliable satellite operation can be realized with a margin.

In particular, in a future artificial satellite, control of each subsystem is closed in each subsystem (subsystem control), and the system is directed to a form in which the control is integrated (system control). Expected. That is, it is expected that on-board automation will be further advanced, but according to the present invention, it is possible to enhance consistency with such an operation mode.

[0020]

As described above in detail, according to the present invention, it is possible to provide an artificial satellite capable of reducing the burden on the operator in controlling the artificial satellite and thereby enabling safe and reliable command operation. Become.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an artificial satellite according to the present invention.

[Explanation of symbols]

 Reference Signs List 100 artificial satellite 200 antenna 1 telemetry command unit 11 command receiver 12 command processing unit 12a scheduler unit 12b command distribution unit 2-1 to 2-n subsystem

Claims (1)

[Claims] 1. A plurality of subsystems for autonomously controlling functions assigned to them by receiving a system control command, command receiving means for receiving and demodulating a command signal transmitted from a ground control system, When the system control command is included in the demodulated output from the command receiving means, scheduler means for determining a time at which the system control command should be individually delivered to the plurality of subsystems in accordance with characteristics of each subsystem. And a command distribution means for individually giving the system control command to the plurality of subsystems in accordance with the distribution time determined by the scheduler means.