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本文以优化产生的二相编码信号为基础,应用超大规模集成器件,设计并实现了大压缩比二相编码信号的产生和数字处理系统。该系统处理190位、127位和63位三种典型码长,并具有处理190位以下任意码长信号的通用能力;系统兼有软限幅和硬限幅二种信号处理工作方式,供雷达操纵员根据目标环境条件灵活选用;系统既可采用码组波形捷变,实现MTI与波形捷变和频率捷变兼容;也可采用脉间波形捷变加非相参积累方式工作.本系统产生带有加性高斯噪声、子脉冲宽为0.3μs的模拟回波,在不同的多普勒频移(0～10kHz)下,测试了脉冲压缩系统的输出主副比及输出信噪比。在没有采用旁瓣抑制加权网络情况下,三位软限幅190位脉冲压缩输出主副比值,在f_d=0时为26.8dB,当f_d=8kHz时为21.6dB,满足了低空中近程监视雷达的工作要求。
Based on the optimized two-phase coded signal, this paper designs and realizes the generation and digital processing system of large compression ratio two-phase coded signal by using VLSI device. The system handles 190 bits, 127 bits and 63 bits of typical code length, and has the ability to handle arbitrary code length below 190 bits long signal; the system has both soft limit and hard limit two kinds of signal processing work for radar The operator selects according to the target environmental conditions flexibly; The system can adopt the code group waveform agility, realize the MTI compatible with the waveform agility and the frequency agile; Can also adopt the agile pulse mode agile non-coherent accumulation work. The simulated echo with additive Gaussian noise and sub-pulse width of 0.3μs was used to test the output primary-secondary ratio and the output signal-to-noise ratio of the pulse compression system under different Doppler shift (0 ~ 10kHz). In the absence of a sidelobe suppression weighted network, the three-bit soft-amplitude 190-bit pulse compression output of the primary and secondary ratio, f_d = 0, 26.8dB, when f_d = 8kHz, 21.6dB, to meet the short-range short-range surveillance Radar work requirements.