JPH10229361A - On-board remote instruction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce DC power consumption by using an on-board computer, so as to process a remote instruction sent from a ground to a satellite body. SOLUTION: When a system OS in a memory 330 is active normally, an on-board logic processor unit 310 after receiving a remote instruction from an instruction logic demodulator (CLD) 270 allows the memory 330 to generate a control signal and allows the memory 330 to store the instruction signal once received and gives the control signal to a SW programmable device 320 for authenticating the instruction and gives an authentication object instruction signal. Then the SW programmable device 320 uses a built-in instruction authentication software as a program, to generate an instruction authentication code and gives the instruction authentication code to the processor unit 310. Then the unit 310 selects a board of a transponder instruction electronic device 420, based on a selected address and gives a control signal to a power supply selection device 410, before transmitting data to the board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T &
The present invention relates to an on-board remote command device having a computer basic structure for use in a C (Telemetry & Command) device.

In particular, the present invention integrates another hardware, that is, a command authentication function of a MAD (Message Authentication Device) and a command decoding function of a CLP (Central Logic Processor), processes them by software, and creates a new internal burst. On-Board processor with bandwidth
Processor) for high-speed processing of large amounts of data, and a power selector for transponder command electronics (XC
E) an on-board remote command device for reducing the power supplied to the remote control device.

[0003]

2. Description of the Related Art Generally, a remote command device can be largely divided into a standard type and a non-standard type. In the past, the standard type and the non-standard type were not distinguished, but in recent years, they have been classified by function and form. Generally, a form based on a past communication method is a non-standard type, and a form having a protocol with a computer configuration method is classified as a standard type.

[0004] Although each of these forms has advantages and disadvantages, each component of the satellite body has a proven inheritance characteristic (Her
Itage) is often considered important. Therefore, in the case of a satellite configuration where stable reliability is required rather than excellent functions and performance, the existing equipment is changed and used, and the remote command device that requires new functions and performance is based on the structure of the computer. It is a recent worldwide trend that the concept of network communication is introduced.

A conventional remote commander for a satellite transponder will be described with reference to FIG. The conventional remote command device is a command logic demodulator ('CL
D ') (50), Remote Command Authentica
Option Device (100), Command Logic Processor (Command Logic
Processor, 'CLP') (200), Power Supplier
(250) and a transponder command electronics ('XCE') with multiple boards
(260).

Here, the internal configuration of the remote command authentication device (100) is an H / W (hardware) logical data encryption standard module (Hardware Logic Data Encryption Standard Module).
e, 'H / W Logic DES') (110), Comparator (120), Command Authentication Code Iden
tifier, 'CAC Identifier') (130), and a Master Control Sequencer (140). The internal structure of the instruction logic processor (200) is composed of a remote command decoder (210) and a remote command control circuit (220).

The configuration of such a conventional remote commander will be described in detail with reference to FIG. Command logic demodulator (CLD)
(50) is the remote command modulated from the receiver
(Remote Command) Receives a signal and plays a role of demodulation.

The hardware logical data encryption standard module (110) is an H / W encoding authenticator, which provides a standard of data encoding and has a unique function for determining whether or not the remote command is compatible. Authentication algorithm. The comparator (120) compares the remote command transmitted from the command logic demodulator (50) with the output of the hardware logic data encryption standard module (110) and compares the result with the master control sequencer (110). 140).

The instruction authentication code verifier (130) receives the execution result of the algorithm from the hardware logical data encryption standard module (110) and sends the verified instruction authentication code to the master control sequencer (140). Output.

The master control sequencer (140) is a command authentication controller, which manages overall control signals of the remote command authentication device (MAD) (100), and outputs the output result of the comparator (120) and the command. The result of comparison with the output of the authentication code verifier (130) is compared, and the compatibility of the remote command is transmitted to the command logic demodulator (50).

A remote command decoder (210) of a CLP (Command Logic Processor) (200) is an OP-cod
Using the e Decoder, the decoder (210) receives from the command logic demodulator (50) the command signal that has been authenticated and confirmed from the command authentication code verifier (130), and outputs the address of each serve device and It serves to separate each data. Therefore, the remote command decoder (210) is connected to the remote command control circuit (Con) in the CLP (200).
The remote control circuit 220 receives all the control, decodes a remote command signal received from the command logic demodulator 50 into an address and data, and transmits data to each address device.

A remote command control circuit (220) is a control unit (Control Circui) for controlling each module of (CLP) (200).
t) a remote command decoder for decoding the remote command signal
(210) serves to provide appropriate timing that can be separated into address and data.

A power supply (250) serves to supply DC power to each board in the transponder command electronics (260). The transponder command electronics (XCE) (260)
It plays a role in controlling each component of the satellite repeater. The control signal and data transmitted to XCE are based on the CLP
Output from (200).

The operation of such a conventional remote commander for a satellite transponder will now be described. Remote command (Rem
The ote command) signal is transmitted from the ground and received by the receiver of the satellite body through the antenna of the satellite body. The remote command signal received by the receiver is converted to an IF (I
After being converted to an intermediate frequency signal, the signal is demodulated by a command logic demodulator (50). The operation sequence of the prior art is until the demodulated remote command signal is finally transmitted to the transponder command electronic device (260).

First, before the remote command signal demodulated from the command logic demodulator (50) is signal-processed by the CLP (200), it is verified whether or not it is a legal command signal. Therefore, the command logic demodulator (50) sends the remote command signal to the remote command authentication device (100) to confirm its legality. The remote command signal transmitted from the command logic demodulator (50) is first supplied to a hardware logic data encryption standard module (110) in the remote command authentication device (100), and the data is encoded in a standard encoding standard. Verify if there is.

When the execution result of the command authentication algorithm of the hardware logic data encryption standard module (110) and the remote command of the command logic demodulator (50) are input to the comparator (120), the comparator (120) sends the result to the master control sequencer (140). On the other hand, the hardware logic data encryption standard module (110) transmits a result confirmed by a specific code value (Key 64 bits) to the command authentication code verifier (130) for command authentication. The command authorization code verifier (130) also sends the remote command authorization code to the master control sequencer (140).

The comparator (120) and the command authentication code verifier (13
The master control sequencer (140) having received the respective results output from (0) and (4) indicates whether or not to execute the remote command already received by the command logic demodulator (50). At this time, if the received remote command is an illegal command, the remote command authentication device (100) issues a command execution impossible command to the command logic demodulator (50). 200).

The instruction logic processor (200) thereby receives the remote instruction from the instruction logic demodulator (50), and receives the received remote instruction by the remote instruction decoder (210) in the instruction logic processor (200). Separation into operation code and data. At this time, all the steps of the signal processing are performed in response to an instruction from the remote instruction control circuit (220) in the instruction logic processor (200).

The transponder command electronics (260) is selected only when the address signal for selecting the transponder command electronics (260) is issued from the command logic processor (200), and the data is used for the selected address. Will be able to

A power supply (250) is a power supply for fixedly supplying DC power to all independent devices.
And the DC power supplied to the transponder instruction electronics (XCE) (260) is the number of boards required by XCE.
(P1, P2, P3, P4).

In such a conventional technology, most of the devices become hardware logic (H / W Logic), and the "TTC Subsystem
for the Olympus Spacecraft "(PJWander & BLFagg,
Journal of the British Interplanetary Society, Vo
l.41.p319-324), it is very difficult to modify it, and a fixed DC power must be supplied to each device, so a certain amount of power is consumed even in Standby Mode The power consumption of each device is very large.

That is, the problems of the conventional remote commander for satellite relay are as follows. First, the conventional remote commander for satellite relay is classified into independent devices according to functions and configured in hardware logic (H / W Logic). In this case, the memory portion and the control portion that are commonly required by the devices are configured to be overlapped. In addition, since it is composed of these independent devices, MAD and
If you try to modify a part of the CLP, the H / W will be modified and the signal will be unreliable.
It is not easy to optimize the system.

Second, in the case of XCE (Transponder Command Electronics) directly interfaced with the satellite transponder, in order to keep each board constituting XCE in the standby mode, a DC (DC) power supply is always supplied from the power supply. Must be applied. This means that as the number of elements on each board increases and as the number of drive interface devices increases, the standby power consumed increases, but this has a large burden on the manufacture of the satellite body.

[0024]

The ultimate technical goal of a satellite body control device including a remote command device is stability (Stabili).
ty), compatibility, reliability (Relliability) and low power consumption. A way to achieve this is an on-board remote commander with a programmable device and a general purpose I / O interface.

That is, the concept of the conventional hardware device is removed and the function of realizing the function through the modularization for each band is realized. By introducing a computer concept (Concept) and a structure (Architecture), which are very easy to process according to signal characteristics, by classifying them into bands, without making H / W devices independently by function, by remote control device, The purpose of the present invention is to keep the structure of the remote commander unchanged even when the function and use are changed.

Further, since the satellite body basically uses limited DC power, power consumption also acts as a very important factor. Therefore, the transponder command electronics (XCE) interfaced with the satellite transponder adopts a selective power application method to increase the power use effect and reduce the amount of heat generated.

According to the present invention, the functions of the conventional remote command authentication device and the remote command signal processing function are implemented by using on-board signal processing (On-Board Pr
It is an object of the present invention to provide an on-board remote command device to make the process easier and reduce DC power consumption.

[0028]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention stores a remote command system program and software for authenticating a remote command signal, and stores a remote command authentication code for an object to be authenticated. A software programmable device to generate, a memory for temporarily storing the system program and the received remote command signal and data for signal processing, and a demodulated signal from the command logic demodulator after being received by the satellite receiver. A remote command signal is received at the input and stored in the memory, the command data to be authenticated is output to the programmable device, a remote command authentication code is received from the programmable device, and the remote command authentication code and the memory are stored in the memory. Authentication by comparing with the remote command signal
A logic processor unit that decodes the authenticated remote command signal to generate an address specifying an output target, and outputs the decoded command data and the address; and outputs the data output from the logic processor unit to the address. And an input / output interface for outputting to an output target specified by the above-mentioned in the form of an on-board computer to process a remote command sent from the ground to the satellite.

[0029] Such an on-board remote commander comprises:
When power is supplied to a transponder command electronic device (XCE) having a large number of boards to which remote command data is output, a power selector for selectively applying power to only the board specified by the address is provided. On-
Include outside the board.

The on-board remote command device determines whether the received signal is a unique remote command signal or a program upgrade signal, and if the received signal is a program upgrade signal, sends the signal to the software programmable device. Overwrite upgrade data (R
e-writing) to upgrade the system program or the command authentication program.

A preferred example of the logic processor unit includes an input port for receiving a remote command, and an operation-code (Operation-cod) signal for authenticating the remote command signal.
e) a decoder that performs software decoding to separate the data from the data, and performs authentication control by comparing the remote command signal and the remote command authentication code, and performs the decoded operation-code. And an arithmetic processing unit that generates an output target address based on the

Here, any one of a microprocessor, a microcontroller, and a digital signal processor can be used as the logic processor unit.

Further, any one of a random access memory (RAM), an EEPROM and a flash memory can be used as the memory.

According to the present invention, the conventional remote command device based on the communication system is changed to a device using a computer concept, and the same function and improved performance are derived.

Therefore, the conventional MAD device for processing the remote command signal and the CLP device are not separately configured, and the S / W
(Software) An on-board configuration having a computer structure of a programmable device, a logic processor unit, and a memory. Therefore, the conventional MAD function and CLP function are configured by software other than hardware and programmed into the S / W programmable device.

Further, a conventional transponder command electronics
In (XCE), the power saving mode could not be selected because the board constituting the XCE device should always be in the standby mode by the DC power supply. However, the on-board remote command device of the present invention can reduce the power consumption by mounting the power selection device and applying the DC power only when needed.

To this end, the present invention provides an S / W programmable device capable of storing software of a DES algorithm for authenticating a remote command signal and a system program of a remote command device. A logic programmable device capable of performing all signal processing including S / W decoding, a memory (Random Access Memory) as a temporary data storage for signal processing, and a power selector for performing a power saving mode are configured. .

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIG. FIG. 2 is a block diagram of an on-board remote commander according to the present invention. On-Board Processing (300) is a traditional remote command authentication device (MAD) and command logic processor.
(CLP) function is realized. The power selector (410) uses a multi-presser and transponder command electronics (X
It operates only when there is a request of (CE) (420). Drawing code 300
And 410 are features of the system configuration of the present invention.

A logic processor unit (Logic Processor Unit)
The unit (310) uses a microprocessor, microcontroller, and digital signal processor to input an input port (311) for receiving a remote command from a satellite receiver and decode the remote command signal received through the input. Decoder (312), and an arithmetic processing unit (ALU; Arithmetic Logic Unit) (313) for performing a remote command signal processing arithmetic function,
And S / W (software) programmable device (3
20) and memory using random access memory (33
0), an internal data bus having a data input / output function (for example, an 8, 16, 32, or 64 bit bus) and a control signal. This differs from the conventional CLP (Command Logic Processor) in function and configuration.

Also, a transponder command electronic device (420)
An input / output interface (I / O Interface) (314) for inputting / outputting data by a driving device or another driving device is connected to the logic processor unit (310). Here, the interface (314) also has a function for designating the address of the transponder command electronics (420) and other driving devices and outputting the command signal after the authentication procedure and signal processing are completed for the remote command. Having.

The S / W programmable device (320) has an EE
It uses a PROM, flash memory, etc., and has a function to determine whether or not a remote command is legal by installing remote command authentication software. The S / W programmable device (320) is a remote instruction system operation software.
Since it is equipped with (OS) and is composed of devices that can read and write freely, software reloading on the ground (Re-Loading) is possible. This is also a part that differs from the conventional remote command authentication device in the configuration method.

The memory (330) has a function of storing processed data and arbitrary data between the logic processor unit (310) and the S / W programmable device (320). This is a part that integrates the register form distributed in each conventional device and manages it as a memory.

The power supply selector (410) is a function for selectively switching the DC power supply to change the power application state from the existing continuous mode to the instantaneous mode (select from among P1 ', P2', P3 ', and P4').
Having.

The power supply (400) is a power supply for supplying DC power to the transponder command electronic device (420) and other driving devices. It performs the same function as reference numeral 250 in FIG.

The transponder command electronic device 420 has a function of receiving data from the input / output interface (I / O interface) 314 and finally generating a response signal corresponding to the remote command. At this time, the required power supply is a power selector
(410). It performs the same function as reference numeral 260.

As can be seen from the above description, the conventional technology is a hardware logic data encryption standard module (H / W Logic DES) (110), a comparator (120), and an instruction authentication code verifier (130). ), Master Control Sequencer
q.) (140), remote command decoder (210), remote command control circuit (2
20) Contrary to this, the present invention has an on-board (O
n-Board) type logic processor unit (310), EEPROM,
Alternatively, it comprises a S / W programmable device (320) using a flash memory, a memory (330) using a random access memory (RAM), and a power selector (410).

The operation of the on-board remote commander according to the present invention having the above structure will be described with reference to FIG. First, the remote command authentication program installed in the S / W programmable device (320) and the remote command system program among the remote command system programs are transferred to the S / W programmable device (32
After porting from (0) to memory (330), it will be used as system OS. The reason is faster execution speed.

As described above, from the memory (330), the system OS
Once the command logic demodulator (CL
D) After receiving the remote command from (270), the logical processor unit (310) generates a control signal in the memory (330), stores the received command signal in the memory (330), and performs authentication for the command. After sending the control signal to the S / W programmable device (320), it sends out the command signal for authentication.
Thereafter, the S / W programmable device (320) generates an instruction authentication code using instruction authentication software incorporated as a program, and further transmits the instruction authentication code to the processor unit (310).

The logic processor unit (310) compares the command authentication code received from the S / W programmable device (320) with the remote command signal stored in the memory (330) to determine whether or not it is legal. Will be able to determine.

Thereafter, S / W decoding for separating the authenticated remote command into an operation code and data is performed. As a result of decoding,
An address for designating an output target device of the output interface (314) is determined, and the data is transmitted to the input / output interface (314).

The transponder command electronics according to the address selected by the input / output interface (314)
Select (420) and its transponder command electronics (42
0) Before sending data to the board in
Power supply selector (410) so that C power can be applied
Send control signal to

These DC power supplies are provided from a power supply 400, and a power supply selector (410) selectively supplies DC power to a transponder according to a power supply signal provided from an input / output interface (314). Apply to each board in the command electronics (420). (Select and apply among P1 'P2' P3 'P4').

On the other hand, it is also possible to upgrade (Up-Grade) the system program of the remote command device and the software which realizes the command authentication algorithm. First, when transmitting a command signal from the ground, a data code of a program to be upgraded is added after the command signal and transmitted. Then, as in the case of receiving the remote command signal, the remote command signal and the data signal are received from the satellite and the logical processor unit (31) is transmitted through the command logical demodulator (270).
0).

After the logical processor unit recognizes and determines a code which is a unique remote command signal or a program upgrade signal, it designates a control signal and an address to the S / W programmable device (320). After that, data is overwritten (Re-written) on the address. Such a function of upgrading the system program and the command authentication program is very usefully used in a satellite. In other words, when the command authentication code is to be changed or when the transponder command electronic device (4
This is particularly useful when trying to change the width of the output pulse of 20).

Therefore, the present invention is exactly an on-board
(On-Board) The functions required for the remote commander are integrated on a single board and configured based on the structure of the computer.The MAD required for the conventional remote commander for satellite repeaters, By processing the functions of the CLP by software using a software programmable device, the system and functions can be changed very easily.

The configuration becomes relatively easy as the system becomes larger or more complex. In addition, the signal processing path can be configured as a data bus having 8, 16, 32, and 64 bits, and can be easily applied to a place where high-capacity data should be processed at high speed.

[0057]

As described above, the conventional technology is independent of the MA.
D It is a method to authenticate the demodulated remote command signal in order to process the remote command signal in the device, and to decode the command signal in the CLP device. There is a disadvantage that it is not possible to convert or change the configuration, and the hardware configuration is very inefficient.

Further, the system OS cannot be upgraded, and the characteristics of a given standard cannot be utilized. In addition, since the system has independent devices for each function, power consumption can be reduced. In contrast to the disadvantages that cannot be achieved, the present invention allows the remote command authentication function (MAD function) and decryption function (CLP function), which were performed in hardware, to be performed in software in the conventional remote commander for a satellite repeater. Processing, and a power saving mode using a power selector can be adopted to reduce DC power consumption.

Further, since the configuration is based on the computer structure, the system can be easily expanded, that is, the MIL-STD-1553B bus and other input / output devices can be easily interchanged, and the bandwidth of the bus can be easily selected. Therefore, signal processing of a large amount of data is possible, and the present invention can be easily applied to a high-speed system.

The present invention described above can be variously replaced, modified, and changed by persons having ordinary knowledge in the technical field to which the present invention belongs without departing from the technical idea of the present invention. Therefore, the present invention is not limited to the above-described embodiment and drawings.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a conventional remote command device.

FIG. 2 is a block diagram of an on-board remote command device according to the present invention;

[Explanation of symbols]

270 Command Logic Demodulator 300 On-Board Processor 310 Logic Processing Unit
Unit) 311 Input Port 312 Decoder 313 Arithmetic Logic Unit (ALU) 314 I / O Interface 320 S / W Programmable Device 330 Memory 400 Power Supply 410 Power Selector 420 Transponder Command Electronics (XCE)

Continued on the front page (72) Inventor Kang Sung Chung Republic of Korea Expo apartment 408-1602, Tamin-dong, Yuseong-gu, Daejeon

Claims (4)

[Claims] 1. A software programmable device for storing software for authenticating a remote command system program and a remote command signal, and for generating a remote command authentication code for an object to be authenticated; A memory for temporarily storing data at the time of signal processing, and a remote command signal demodulated from the command logic demodulator after being received by the receiver of the satellite body and stored in the memory, and The command data is output to the programmable device, a remote command authentication code is given from the programmable device, the remote command authentication code is compared with a remote command signal stored in the memory, and the remote command authentication code is authenticated. Decodes signals and issues addresses to specify output targets A logic processor unit for outputting decoded instruction data and the address, an input / output interface for outputting data output from the logic processor unit to an output target specified by the address, and an on-board computer An on-board remote commander configured to process remote commands sent from the ground to the satellite. 2. The on-board remote command device, when supplying power to a transponder command electronic device (XCE) having a plurality of boards to which the remote command data is to be output, supplies the power to a board specified by the address. 2. The on-board remote command device according to claim 1, further comprising a power selector for selectively applying power to the outside of the on-board. 3. The on-board remote command device determines whether a received signal is a unique remote command signal or a program upgrade signal. If the received signal is a program upgrade signal, the on-board remote command device transmits the program upgrade signal to the software programmable device. Overwrite upgrade data
The on-board remote instruction device according to claim 1, wherein the system program or the instruction authentication program is upgraded by performing (Re-writing). 4. The logic processor unit according to claim 1, further comprising: an input board for receiving a remote command;
a decoder that performs software decoding for separating the data into a ratio-code and data, and performs authentication control by comparing the remote command signal and the remote command authentication code, and performs the decoded operation-code. 2. The on-board remote instruction device according to claim 1, further comprising: an arithmetic processing unit for generating an output target address based on the code.