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针对脉压系统主旁瓣比这一主要矛盾。首先,从理论上分析了频域的幅度起伏,时域的相位起伏,相位误差和幅度起伏等对主旁瓣比的影响,对双色散脉冲压缩系统采用简单时域海明加权,压缩比为70和50时只能各自获得28db 和24db 的主旁瓣比,这就必需采取有效措施消除或减少上述影响主旁瓣比的因素,使主旁瓣比获得改善。然后对双阵列SAW 器件实现的脉冲压缩系统,采用各种措施研究了主旁瓣比的改善,这些措施有综合,方化和宽度参差等,其中综合法是非常有效的。采用单δ函数模型和FFT 算法用计算机模拟计算了压缩比为70和50的器件,各自满意地获得了40db 和36.8db 的主旁瓣比。文中也给出了综合法的具体方法。最后提出了一个减小衍射误差的简单方案。
Main pulse pressure system for the main side than the main contradiction. First of all, the influence of frequency fluctuation in the frequency domain, phase fluctuation in the time domain, phase error and amplitude fluctuation on the mainlobe ratio is analyzed theoretically. For the two-chromatic dispersion, a simple time-domain Hamming weighting is adopted, and the compression ratio is 70 and 50 can only get the main sidelobe ratio of 28db and 24db, which must take effective measures to eliminate or reduce the factors that affect the main sidelobe ratio, so that the mainlobelobe ratio improved. Then the pulse compression system of dual-array SAW device is implemented. Various measures are taken to study the improvement of the main-sidelobe ratio. These measures are comprehensive, square and wide-ranged, among which the synthesis method is very effective. A single delta function model and FFT algorithm were used to simulate the devices with 70 and 50 compression ratios respectively. The mainlobe ratios of 40db and 36.8db were obtained satisfactorily. The article also gives a concrete method of comprehensive law. Finally, a simple solution to reduce the diffraction error is proposed.