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针对航天测控通信的抗干扰问题,提出了一种改进的软扩频捕获及译码算法,基于自相关和互相关特性设计了具有强抗干扰能力的扩频前导序列,提高了信号捕获的灵敏度,并根据解扩后的相关值采用软判决译码方式提高了传输链路的可靠性。分析及仿真结果表明,本文算法在强干扰条件下依然有较高的信号捕获概率和较低的误码率,信号的捕获性能和误码率性能明显优于常规软扩频算法,能够满足航天测控抗干扰的实际应用。
Aiming at the anti-jamming problem of aerospace measurement and control communication, an improved soft-spectrum acquisition and decoding algorithm is proposed. Based on the autocorrelation and cross-correlation, a spread spectrum preamble with strong anti-jamming capability is designed to improve the sensitivity of signal acquisition , And uses the soft decision decoding method based on the correlation values after despreading to improve the reliability of the transmission link. The analysis and simulation results show that the proposed algorithm still has a higher signal acquisition probability and a lower error rate under strong interference conditions. The signal acquisition performance and bit error rate performance are significantly better than the conventional soft-spreading algorithm, Measurement and control anti-jamming practical application.