A Tracking Demodulation Method for 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: 2022-01-11
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 offset in a large range affects the acquisition of spreading codes under high dynamic conditions

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  • A Tracking Demodulation Method for High Dynamic Spread Spectrum Signal

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Embodiment Construction

[0023] A method for tracking and demodulating a highly dynamic spread spectrum signal of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

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

[0025] The implementation steps of the case are as follows:

[0026] 1. IF signals with Doppler frequency deviation enter separately figure 1 In the middle, I-way multiplier 2, I-way low-pass filter 5 and Q-way multiplier 3, and Q-way low-pass filter 6 complete quadrature down-conversion to generate I and Q two-way signals, and output the above-mentioned signals to n-channel partial correlation FFT7, carry out the FFT operation of partial correlation, obtain the complex number FFT cal...

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Abstract

The invention relates to the field of receiving and processing high dynamic spread spectrum signals in the aerospace telemetry communication system. It specifically relates to a tracking demodulation method of a high dynamic spread spectrum signal, aiming at solving the problem that a large range of Doppler frequency deviation affects the capture of a spread spectrum code under high dynamic conditions. Through the integrated design of the spread spectrum code capture and tracking process, the processing method of demodulation data direct judgment saves the spread spectrum code tracking loop and the code clock synchronization loop, which greatly improves the tracking and demodulation speed of the spread spectrum signal. Moreover, the resource usage is reduced, which can meet the strict requirements of the processing platform for real-time processing of short-time burst signals.

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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Patent Type & Authority Patents(China)
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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