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Extremely low code rate remote control reliable receiving method suitable for deep space communication

A technology of deep space communication and receiving method, which is applied in the field of aerospace measurement and control communication, and can solve the problem that the size of the demodulation circuit is huge, unable to meet the requirements of demodulation of various code rates, ultra-low code rate demodulation, and unsuitable for deep space exploration mission requirements, etc. problem, to achieve the effects of small demodulation loss, reduced debugging workload, and low bit error rate

Inactive Publication Date: 2019-07-05
BEIJING INST OF SPACECRAFT SYST ENG
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the limitation of analog device characteristics, it cannot meet the demodulation requirements of various code rates and the demodulation of ultra-low code rates
In addition, the size of the existing demodulation circuit is huge, which is not conducive to the light and small design of the product, and is not suitable for the mission requirements of deep space exploration.

Method used

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  • Extremely low code rate remote control reliable receiving method suitable for deep space communication
  • Extremely low code rate remote control reliable receiving method suitable for deep space communication
  • Extremely low code rate remote control reliable receiving method suitable for deep space communication

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Experimental program
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Effect test

Embodiment

[0119] Adopt FPGA to realize the method of the present invention.

[0120] In this method, the received analog BPSK modulation signal is first passed through a band-pass filter for anti-aliasing filtering, and then A / D sampling is performed, and the sampled digital signal is sent to the FPGA chip for demodulation operation. The FPGA demodulation method is designed and realized according to the method of the present invention.

[0121] The FPGA demodulation chip can meet the following technical indicators:

[0122] 1. BPSK modulation on the remote control subcarrier, burst transmission channel;

[0123] 2. Modulation center frequency is 8000hz±0.02%hz;

[0124] 3. Switching according to the command can realize three code rate demodulation of 7.8125bps, 125bps and 1000bps;

[0125] 4. When the normalized signal-to-noise ratio of subcarrier input is not less than Eb / N0=16dB;

[0126] 5. In the case of Eb / N0=16dB, the demodulation bit error rate is not greater than 10 －5 ;

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Abstract

The invention discloses an extremely low code rate remote control reliable receiving method suitable for deep space communication, which can realize demodulation with a code rate lower than 125 bps (can realize demodulation with a code rate of 7.8125 bps) and meet task requirements of deep space detection. The method is adopted and used in cooperation with an FPGA chip and the like, the whole receiving device can be reduced to be a chip, and the requirements of deep space exploration for the size and power consumption are met; according to the method, the demodulation loss of a receiving circuit is small, the demodulation loss is increased by 2dB or above compared with that of traditional equipment, and the lower bit error rate is achieved under the same Eb / No condition; according to the invention, demodulation of multiple code rates can be realized under one band-pass filter, and the debugging workload of the filter is reduced.

Description

technical field [0001] The invention belongs to the technical field of aerospace measurement and control communication, and in particular relates to a very low code rate remote control reliable receiving method suitable for deep space communication. Background technique [0002] In my country's satellite measurement and control system, the unified S-band measurement and control system is widely used. The measurement and control uplink adopts the PM modulation method, and signals such as remote control subcarriers and ranging tones are superimposed on the center carrier. The transponder performs carrier tracking demodulation on the PM signal, and sends the remote control subcarrier output to the remote control unit for subcarrier demodulation. figure 1 The position of remote control subcarrier demodulation in the satellite TT&C link is given. The remote control subcarrier is BPSK modulation. Commonly used information code rates are 2Kbps and 1Kbps. For deep space detectors...

Claims

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Application Information

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IPC IPC(8): H04L27/227H04B1/12H04W52/52H04B7/185
CPCH04B1/123H04B7/18519H04L27/2272H04L27/2273H04W52/52
Inventor 沈小虎叶志玲顾明王翠莲杨小瑞
Owner BEIJING INST OF SPACECRAFT SYST ENG
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