JP2000215088A - Computer mounted on satellite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily analyze the mounted computer in case of an error and to easily make recovery from the error by providing an independent memory which can store data even when the computer is powered OFF and saving data in control such as error information in the memory. SOLUTION: The satellite-mounted computer 1 is provided with a 2nd memory RAM 6 which can save data inside and a power circuit 8 which supplies the electric power to the 2nd memory RAM 6. If an error occurs, error information is saved after switching to the 2nd memory, and the computer 1 is powered ON again to hold the data obtained so far. Consequently, data needed to analyze the error can be taken out as telemetric data after the computer 1 is restarted to smoothly restore the operation of the satellite.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer mounted on an artificial satellite for controlling the satellite.

[0002]

2. Description of the Related Art FIG. 3 shows a configuration of a computer mounted on an artificial satellite. The mounting computer 1 includes a control processor (CPU: Central Process).
ingUnit) 2 and a read-only memory (ROM: Read O) storing control programs and data.
nly Memory) 3, an interface circuit 4 for exchanging information with the outside of the computer, and a write / read memory (RA) for recording data under control.
M: Random Access Memory) 5. FIG. 4 shows an outline of the error processing of the program when any error occurs during the processing of the computer. If an error occurs in the computer program, the process branches to an error processing program, where error processing 11 such as error classification and flag setting is performed, and information necessary for investigating the cause of the error such as register information is stored in the RAM 5. Process 12 to save to another variable
After that, the normal end processing 15 of the clock is executed.

[0003]

The conventional satellite computer is configured as described above. If an error occurs in the computer program, necessary error information is saved in another variable on the RAM 5. Wait for the next clock. Here, the saved error information can be checked on the ground after an error occurs by editing the error information into telemetry data.However, when an error occurs, the editing of the telemetry data is often not performed. Therefore, the computer is first stopped and restarted, and then the cause is investigated. However, in the case of an artificial satellite, power is not normally supplied to the RAM 5 in order to reduce the power consumption of the satellite.
When the power is turned off and restarted, the saved error information on the RAM 5 is also lost, and it is very difficult to determine the cause of the error that has occurred.

[0004] The present invention has been made to solve the above problems, and is intended to quickly analyze an on-board computer when an error has occurred, thereby facilitating recovery from the error.

[0005]

According to a first aspect of the present invention, a computer mounted on a satellite according to the present invention includes a second memory capable of storing data therein and a power supply circuit for supplying power to the second memory. When an error occurs, the error information is saved after switching to the second memory capable of storing data,
Even if the power of the computer is turned on again, the data so far can be stored.

A computer mounted on a satellite according to the second invention uses a RAM as the second memory in the first invention.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a mounting computer, 2 denotes a CPU of the mounting computer,
Is a ROM, 4 is an interface circuit, 5 is a RAM, 7 is a power supply circuit, 9 is a power supply line to a mounting computer, and 6 is a data storage RA which is a unique configuration of the present invention.
M is a power supply circuit for supplying power to the RAM 6, and 10 is a power supply line to the RAM 6. FIG.
FIG. 3 is a flowchart of a program according to the first embodiment of the present invention. In the figure, reference numeral 11 denotes an error process when an error occurs, 13 denotes a save process of register information and the like, 15 denotes a program end process, and 12 and 14 denote program end processes. This is a switching process between the data storage RAM 6 and the normal RAM 5 which is a specific configuration of the present invention. For example, if an error occurs during the computer processing of the satellite operation, the error processing program stores information such as the type of the error, the location of the generated logic, and data such as computer register information in the RAM 6 for data storage. To record.

[0008]

As described above, the on-board computer according to the first and second aspects of the present invention has a memory capable of storing data even when the power of the computer is turned off. By storing data in this memory, after restarting the computer, data necessary to analyze the error that has occurred can be extracted as telemetry data, which is useful for smoothly restoring satellite operation. It is.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a satellite-mounted computer according to the present invention.

FIG. 2 is a flowchart showing an outline of error processing in the satellite mounted computer according to the first embodiment of the present invention;

FIG. 3 is a configuration diagram showing a conventional satellite-mounted computer.

FIG. 4 is a flowchart showing an outline of error processing in a conventional satellite-mounted computer.

[Explanation of symbols]

1 computer, 2 CPU, 3 ROM, 4
Interface circuit, 5 RAM, 6 RAM, 7 power circuit, 8 power circuit, 9 power line, 10 power line, 11 error processing, 12 RAM switching processing,
13 Save processing of register information etc., 14 RAM switching processing, 15 End processing.

Claims (2)

[Claims] 1. A satellite control processor mounted on an artificial satellite, a first memory connected to the control processor and storing data and programs, a control program recorded on the memory, a satellite main body and data In a satellite-equipped computer composed of an interface circuit for exchanging data and a power supply circuit for supplying power to these devices, a second method is provided in which data can be saved regardless of whether the computer is turned on or off. A memory, a power supply circuit provided separately from the power supply circuit, for supplying power to the second memory, and a control program for switching and storing error information and the like generated during computer processing in the second memory. A computer mounted on a satellite, characterized in that: 2. The satellite-mounted computer according to claim 1, wherein said second memory is a RAM.