Tracking demodulation method of high dynamic spread spectrum signal

A technology of spread spectrum signal and demodulation method, which is applied in the field of receiving and processing of high dynamic spread spectrum signal, can solve the problems affecting the acquisition of spread spectrum code, achieve the effect of improving tracking demodulation speed and reducing resource usage

Active Publication Date: 2019-04-05
北京航天万源科技有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the Doppler frequency

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  • Tracking demodulation method of high dynamic spread spectrum signal

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[0023] The following describes in detail a method for tracking and demodulating a high dynamic spread spectrum signal of the present invention with reference to the accompanying drawings and embodiments.

[0024] The spread spectrum signal parameters involved in the implementation case: IF 11.52MHz, spreading code rate 7.68MHz, sampling rate 46.08MHz, spreading code length 128, modulation method BPSK, baseband code rate 60KHz, Doppler frequency offset 20KHz.

[0025] The case implementation steps are as follows:

[0026] 1. IF signals with Doppler frequency deviation enter respectively figure 1 Middle I multiplier 2, I low-pass filter 5 and Q multiplier 3, Q low-pass filter 6 completes quadrature down-conversion to generate I, Q two-channel signals, and output the above-mentioned signals to n-channel partial correlation FFT7, perform some related FFT calculations, get the complex FFT calculation results of several points, and output the calculation results to the spreading code acqu...

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Abstract

The invention relates to a tracking demodulation method of a high dynamic spread spectrum signal, belongs to the field of high dynamic spread spectrum signal reception and processing in the aerospaceremote measurement communication system, and aims at solving the problem that large-range Doppler frequency offset influence capture of spreading codes. Code spreading, capturing and tracking are integrated in design, demodulation data is directly decided in processing, a spreading code tracking loop and a code synchronization loop are omitted, the spread spectrum signal tracking demodulation speed is improved greatly, the resource application amount is reduced, and strict requirement for the processing platform of processing short-time burst signals in real time can be met.

Description

technical field [0001] The invention relates to the field of receiving and processing high dynamic spread spectrum signals in the aerospace telemetry communication system. Specifically, it relates to a tracking and demodulation method of a high dynamic spread spectrum signal, which can satisfy the real-time reception and processing of the spread spectrum telemetry signal by an aerospace high dynamic platform. Background technique [0002] Receiving broadband spread spectrum signals on aerospace high dynamic platforms needs to face the problem that high-speed spread spectrum codes cannot be captured due to large-scale Doppler frequency offset. The tracking and demodulation method of a high dynamic spread spectrum signal involved in the present invention can effectively solve this problem, and compared with some common solutions at present, it has the integrated design of the capture and tracking process of the spread spectrum code, and the direct judgment of the demodulated d...

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Application Information

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IPC IPC(8): H04B1/7073
CPCH04B1/7073
Inventor 邹敏林汝梁丁辉王铮骆海潮梁训波
Owner 北京航天万源科技有限公司
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