KR100205046B1 - An agile command device with on-board for the satellite transponder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-board remote command device having a computer basic structure. In order to solve the problem of command authentication code, power consumption, reliability, and compatibility, the present invention provides a logic signal processing device and a S / W programmable device. And memory, the functions of the conventional MAD (Message Authentication Device) device 1 and the CLP (Central Logic Processor) device are all integrated into the logic signal processing device and the memory to implement on-board (On-Board) simply.

Instead of performing command authentication by a MAD device composed of a separate hardware device, a command authentication optimization method using software is applied, and if necessary, a new command authentication algorithm can be programmed on the ground and downloaded to a satellite. In addition, although each system board constituting the conventional XCE (transponder command electronics) always required a DC power source, the present invention can significantly reduce power consumption since the power saving mode is adopted. In addition, since the system internal bus is used, the bus bandwidth of 8, 16, 36, 64 bits can be selected, which is suitable for high-speed signal processing of large data. In addition, since the conventional structure is configured as a separate device to perform all the functions in the on-board computer (On-Board Computer, OBC) all improves power consumption, weight, reliability, flexibility.

Description

On-Board Remote Command Device with On-Borad for the Satellite Transponder

In the present invention, an on-board device having a computer basic structure used in a message authentication device (MAD), a central logic processor (CLP), and a transponder command electronics (XCE) of a satellite repeater TC (Telemetry Command) device is applied. . In addition, the power of the transponder command device (XCE), which finally processes the remote command signal, is processed by the power selector to reduce power consumption. Therefore, the on-board remote command device uses a command authentication device (MAD) and an OP-code decoder of central logic processor (HAD) composed of conventional hardware logic (H / w logic). The present invention relates to a device that implements remote command processing using an S / W programmable device, a logic signal processing device, and a random access memory so that software processing can be integrated.

The characteristics of the conventional method for implementing a remote command device for a satellite amplifier will be described with reference to FIG.

The central logic demoduiator (CLD) 50 of FIG. 1 receives and demodulates a modulated remote command signal from a receiver (not shown).

In addition, the code and authenticator (H / W Data Encryption Standard) 110 provides a standard for data encoding and performs a unique authentication algorithm for determining whether the remote command is direct.

Comparator 120 compares the remote command from the central logic demodulator 50 with the output of the coded authenticator 110 and compares the result with the command authentication controller (Master Control) of the remote command authentication device (MAD). Sequencer) to pass to (140).

In addition, the command authentication code generator 130 receives the result of performing the algorithm from the encoding authenticator 110 and passes the confirmed command authentication code to the command authentication controller 140.

The command authentication controller 140 manages the overall control signal of the remote command authentication device (MAD), and compares the output result of the comparator 120 with the output result of the command authentication code generator 130 to suitably synthesize the remote command. Whether or not to transmit to the central logic demodulator 50.

The remote command decoder 210 of the command logic processor (CLP) device 200 receives a command signal that has already been authenticated from the command authentication code generator 130 from the central logic demodulator 50. It receives and separates the address of each subunit and the corresponding data. Accordingly, the remote command decoder 210 receives all the control from another remote command controller 220 in the CLP apparatus 200 and decodes the remote command signal received from the central logic demodulator 50 into an address and data. It serves to transfer data to the address device.

The remote command controller 220 is a control circuit for controlling each module of the CLP apparatus 200, and the remote command decoder 210 that decodes the remote command signal can properly separate an address and data. It controls to provide timing.

In addition, an electronic power controller (EPC) 250 serves to supply DC power to each device.

Transponder Command Electronics (XCE) 260 is responsible for controlling the components of the satellite repeater. Control signals and data transmitted to the XCE is output from the CLP apparatus 200. Referring to the operation sequence of the conventional remote command device for a satellite repeater as follows.

The command signal is transmitted from the ground and received by the satellite receiver through the satellite antenna. The remote command signal received by the receiver is demodulated through the central logic demodulator 50 through a frequency down conversion to an IF (Intermediate Frequency) band. Here, the operation procedure of the prior art is until the demodulated remote command signal is finally transmitted to the transponder command device 260.

First, the remote command signal demodulated through the central logic demodulator 60 must first be authenticated whether or not it is a legitimate command signal before being signaled by the CLP 200. Therefore, the central logic demodulator 50 transmits a remote command signal to the remote command authentication device 100 to check whether it is legal.

The remote command signal from the central logic demodulator 50 is first applied to the hardware encoding authenticator 110 in the remote command authentication device 100 to verify whether the data standard encoding standard is satisfied. The result of performing the command authentication algorithm from the hardware coded authenticator 110 and the remote command from the central logic demodulator 50 are input to the comparator 120 to transmit the result to the command authentication controller 140. Meanwhile, the hardware encoding authenticator 110 transmits the result of confirming the feature code value (Key 64 bits) for command authentication to the command authentication code generator 130, and the command authentication code generator 130 also transmits the remote command authentication code. The command is transmitted to the authentication controller 140. The command authentication controller 140 which has received the respective results from the comparator and the command authentication code generator 130 already indicates whether to execute the remote command received by the central logic demodulator 50. At this time, if the illegal command, the remote command authentication device 100 gives a command impossible command to the central logic demodulator 50, and if it is a legitimate command, the remote command is transmitted to the command logic processor 200.

Accordingly, the command logic processor 200 receives the remote command from the central logic demodulator 50 and separates the received remote command from the op-code and data by the remote command decoder 210. In this case, all the processes of the signal processing are performed under the instruction of the remote command controller 220 in the command logic processor 200. The transponder command device 260 is selected only when an address signal for selecting the transponder command device 260 is generated from the command logic processor 200 and the corresponding data is written to the selected address.

The power supply unit (ECP) 250 is a power supply that supplies DC power to all independent devices in a fixed manner, and the DC power supplied to the transponder command unit (XCE) 260 is required by the XCE board. It is always needed as much as (Board) number ([p1], [p2], [p3], [p4]). This conventional technique is very difficult to modify because most devices are hardware logic (H / W Logic), and because a fixed amount of DC power must be supplied to each device, even in a standby mode (Standby Mode) The power consumption of each device is very high.

In other words, the features of the conventional remote command device for a satellite repeater are as follows.

First, the conventional remote command device for a satellite repeater is divided into independent devices according to functions, and configured as hardware logic (H / W logic). In this case, the memory part and the control part which are commonly required in each device may be overlapped. In addition, since it is composed of independent devices, it may be easy to share tasks when modifying a part of MAD or CLP, but the reliability of the signal is deteriorated due to the need to modify H / W. That's not true.

Secondly, in case of XCE (Transponder Command Electronics) directly interfaced with satellite repeater, DC power should be always applied from EPC in order to keep each board constituting XCE in standby mode. This means that as the number of elements of each board or the number of driving interface devices increases, the standby power consumed increases, which puts a heavy burden on the production of satellite blades.

In general, remote command devices can be divided into standard and non-standard types. In the past, the standard type and the non-standard type were not distinguished, but recently, they are classified according to their function and form. In general, forms based on past communication methods are non-standard, and computer-configured protocol holdings are classified as standard. However, each of these forms has advantages and disadvantages, but each component of the satellite is often more important than the verified heritability. Therefore, in the case of satellite configuration that requires more stable functions than excellent functions and performances, the existing devices are used by changing existing devices. In general, remote command devices that require new functions and performances have introduced the concept of network communication based on the computer structure. It is a trend.

The on-board remote command apparatus of the present invention has the function of the existing remote command authentication apparatus and the remote command signal processing function on-board signal processing and the power selector which can reduce the DC power consumed. There is a difference in the configuration method from the existing remote command device for the satellite repeater in the sense of detecting the. The XCE in the present invention may be replaced with another device, but due to the characteristics of the present invention, there is no difference in describing the On-Board remote command device and thus other devices are excluded.

The ultimate technology goal of satellite control devices, including remote command devices, is to ensure stability, compatibility, reliability and low power consumption. The way to achieve this is an on-board remote command unit with a programmable device and a universal I / O interface. In other words, the present invention deviates from the conventional function-oriented H / W device concept and implements a function through modularization for each band. It does not manufacture independent H / W device by function, but it is classified by band and introduces computer concept and architecture which is very easy to process signal according to signal characteristics. The structure of the device does not change. Also, since satellites basically use limited DC power, power consumption is very important. Therefore, by adopting a selective power supply method to the transponder command device (XCE) interfaced with the satellite repeater, the power use efficiency is increased and the amount of emitted heat is reduced. Accordingly, the present invention provides an on-board remote command apparatus that solves the problems of H / W complexity and power consumption, which are disadvantages of the prior art, by adopting an on-board computer concept with a programmable device. have.

1 is a block diagram of a conventional remote command apparatus.

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

* Explanation of symbols for main parts of the drawings

270 central logic demodulator (CLD)

300: On-Board Processor

310: logic signal processing device 311: input port

312 Decoder 313 Operational Algorithm (ALU)

314: I / O interface 320: S / W programmable device

330: data storage 400: power supply

410: power selector 420: transponder command device

In order to achieve the above object, the present invention processes a remote command signal received from a receiver and demodulated through a central logic demodulator, outputs a control signal for data storage and command authentication, and corresponding data, and transmits a transponder command. A logic signal processing device for outputting a power-on control signal to the device; A data storage unit for storing a demodulated remote command signal according to a control signal for data storage of the logic signal processing apparatus; A software programmable device that receives a control signal for authenticating the command of the logic signal processing device and command data for authentication, generates a command authentication code by its own program, and sends the command authentication code back to the logic signal processing device; And a power selector for selectively outputting power to a corresponding board in the transponder command device according to the power control signal from the power supplied from the power supply for power saving.

The logic signal processing apparatus includes an input port for receiving a remote command signal; A decoder which decodes the received remote command signal into remote command codes and data; A logic computing device for judging legitimacy by comparing a command authentication code received from a software programmable device with a remote command signal stored in a data storage; And an input / output interface for selecting a transponder command device and outputting a power control signal for supplying power to a corresponding board in the transponder command device according to the comparison result.

As described above, the present invention firstly changes the conventional remote command apparatus based on the communication method into a device incorporating the computer concept and derives the same function and improved performance. Therefore, the MAD device and the CLP device are not separately configured for the conventional remote command signal, but are configured in an on-board form having a computer structure of an S / W programmable device, a logic processor device, and a memory. Therefore, the conventional MAD function and CLP function are configured by software, not by hardware, to program the S / W programmable device.

Secondly, the conventional transponder command device (XCE) could not select the power saving mode because the component board constituting the XCE device must always be in standby mode by DC power. However, the on-board remote command device is equipped with a power selector to apply DC power only when necessary, thereby reducing power consumption.

To this end, the present invention, the software of the DES algorithm for authenticating the remote command signal and the S / W programmable device that can store the system program of the remote command device, all signal processing including the S / W decoding of the remote command signal A logic processor device capable of performing the operation, a memory (Random Access Memory) which is a temporary data storage place for signal processing, and a power selector for performing a power saving mode.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a block diagram according to the present invention.

The on-board processing unit 300 implements both the functions of the conventional remote command authentication unit (MAD) and the command logic processor (CLP). The power supply selection unit 410 is a transponder command unit. (XCE) 420 operates only upon request. Reference numerals 300 and 410 are features of the system configuration of the present invention.

The logic signal processing apparatus 310, which uses a microprocessor, a microcontroller, and a digital signal processor, decodes an input port 311 for receiving a remote command from a satellite receiver and a remote command signal received through the input port. Decoder 312, an arithmetic logic unit (ALU) 313 performing a remote command signal processing operation function, and a transponder command device 420 or other driving device in charge of outputting data. / I / O Interface (314), and has a bus and control signal having the input and output function to the data storage unit 330 using the S / W programmable device 320 or random access memory have. This is different in function and configuration from the conventional CLP (Central Logic Processor).

The S / W programmable device 320 uses an EEPROM, a flash memory, or the like, and has a function of determining whether or not the remote command is legal by mounting the remote command authentication software. In addition, since the system is equipped with a remote command system OS and is free to read and write, S / W re-loading from the ground is possible. Is a different way of organizing.

The data storage unit 330 has an arithmetic process or an arbitrary data storage function between the logic signal processing apparatus (logical signal processing apparatus) 310 and the S / W programmable device 320.

This is the part that manages the memory by integrating the register form distributed in each conventional device.

The I / O interface 314 has a function of outputting data to the transponder command device 420 or other driving device after the authentication procedure and signal processing are completed for the remote command. The power selector 410 has a function (selection among [p1], [p2], [p3], and [p4]) to selectively cut off the DC power in order to change the power supply state from the usual normal mode to the instantaneous mode. . The power supply unit 400 is a power supply device for supplying DC power to the transponder command device 420 or other driving device.

The transponder 420 receives data from the I / o interface 340 and finally generates a response signal according to a remote command. The necessary power is provided from the power selector 410.

In view of the above, the conventional technology is a coded authenticator (H / W Logic DES) 110, a comparator 120, a command authentication code generator (MAC) 130, a command authentication controller (Master Control Seq. (140) and a remote command decoder 210, a remote command controller 220, the present invention is an on-board logic signal processing device 310, S / W programmable device 320, The data storage unit 330 using the random access memory and the power selection unit 410 is composed of.

Referring to FIG. 2, the signal flow between the components is first applied to the remote command authentication program and the remote command system program mounted on the S / W programmable device 320 from the S / W programmable device 320. After porting to the storage unit 330 is used as a system OS. This is because of the faster performance. As such, when the system OS operates normally in the data storage unit 330, after receiving a remote command from the central logic demodulator (CLD) 270, the logic signal processing apparatus 310 sends a control signal to the data storage unit 330. After generating the command signal once received in the data storage unit 330, and sends a control signal to the S / W programmable device 320 for command authentication, and then sends an authentication target command signal. Then, the S / W programmable device 320 generates a command authentication code through the command authentication software built into its own program and transmits it back to the logic signal processing apparatus 310. The logic signal processing apparatus 310 compares the command authentication code received from the S / W programmable device 320 with the remote command signal stored in the data storage unit 330 to determine whether it is legal. After that, S / W decoding is performed to separate the authenticated remote command into OP-code and data. As a result of the decoding, an address for designating an output target device of the input / output interface 314 is determined according to the OP-code, and the corresponding data is transmitted to the input / output interface 314. The power selector selects the transponder command device 420 according to the address selected by the input / output interface, and applies DC power to the board before exporting data to the board in the transponder command device 420. The control signal is sent to 410. These DC powers are provided by the power supply unit 400, and DC power is selectively applied according to the operation state of the power selector 410 ([p1], [p2], [p3], [p4]). ).

On the other hand, it is also possible to upgrade (Up-Grade) the system program of the remote command device or software implementing the command authentication algorithm. First, when sending the command signal from the ground, add the data code of the program to upgrade after the command signal. Then, as in the case of receiving the remote command signal, the satellite system receives the remote command signal and the data signal and transmits it to the logic signal processing apparatus 310 through the central logic demodulator 270. The logic signal processing apparatus recognizes and determines whether it is a unique remote command signal or a program upgrade signal, assigns a control signal and an address to the S / W programmable device 320, and then writes data to the corresponding address (Re). -writing) Such a system program or command authentication program can be a very important factor in satellites. That is, it is particularly useful when you want to change the command authentication code or when you want to change the output pulse width of the transponder command device (XCE device) 420.

Therefore, the difference between the conventional method and the present invention is that the on-board remote command device combines the functions required on a single board and consists of a computer structure. In the present invention, the functions of the MAD and CLP apparatuses are software-processed in the S / W programmable device, so that the optimization of the system and the function change or modification is very easy.

This is relatively easy to configure as the system gets larger or more complex. In addition, the signal processing path can be configured as a data bus having 8, 16, and 32 64 bits, and can be easily applied to a place where a large amount of data needs to be arithmetic at high speed.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those having ordinary knowledge in the technical field to which the present invention belongs, and therefore, the embodiments and drawings described above are limited to It is not.

As described above, since the conventional technology is a method of performing command authentication on an independent MAD device for decoding a remote command signal and processing a command signal on a CLP device to process the remote command signal, it is used only as a unique device for remote command. Its disadvantage is that it can not be dedicated or modified for its purpose, resulting in a very inefficient hardware configuration. In addition, the system OS can not be upgraded, it is not possible to recycle the characteristics within a given standard, and because there is an independent device for each function, there is a disadvantage that can not reduce the power consumption, the present invention in the conventional remote command device for satellite repeater The remote command authentication function (Mad function) and the decryption function (CLP function), which were performed in hardware, can be processed in software, and the power consumption mode using the power selector can be adopted to reduce the DC power consumption.

In addition, since the computer structure is based on the system, it is not only easy to expand the system, that is, compatibility with the MIL-STD_1553B bus or other input / output devices, but also the bus bandwidth can be easily selected, enabling high-capacity data signal processing. Easy to apply

Claims (8)

Logic signal for processing remote command signal received from receiver and demodulated through central logic demodulator to output control signal for data storage and command authentication and corresponding data, and output power supply control signal to transponder command device A processing device; A data storage unit for storing the demodulated remote command signal according to a control signal for data storage of the logic signal processing apparatus; A software programmable device which receives a control signal for authenticating the command of the logic signal processing device and command data for authentication and generates command authentication code by its own program and sends the command authentication code back to the logic signal processing device; And a power selector configured to selectively output power supplied from a power supply to a corresponding board in the transponder command device in accordance with the power control signal for power saving. . The logic signal processing apparatus of claim 1, further comprising: an input port configured to receive the remote command signal; A decoder which decodes the received remote command signal into a remote command code and data; A logical operation device for comparing the command authentication code received from the software programmable device with a remote command signal stored in the data storage unit to determine whether it is legal; And an input / output interface configured to select a transponder command device according to the comparison result and output a power control signal for applying power to a corresponding board in the transponder command device. Command device. The on-board remote command apparatus of claim 1, wherein the logic signal processing apparatus uses any one of a microprocessor, a microcontroller, and a digital signal processing processor. The on-board remote command apparatus according to claim 1, wherein the logic signal processing apparatus recognizes and determines a unique remote command signal or a program upgrade signal. The on-board remote command apparatus of claim 1, wherein the data storage unit is a random access memory. The on-board remote command apparatus of claim 1, wherein the data storage unit uses any one of an EEPROM and a flash memory. The on-board remote command apparatus of claim 1, wherein the software programmable device is equipped with a remote command system operating system to enable software reloading. The on-board remote command device according to claim 1, wherein the power selector uses a multiplexer.