Modern synthetic aperture radars (SAR), e.g., space SARs for remote sensing of the Earth, use signals with linear frequency modulation and signals with phase-code shift keying (PCSK) coded by M-sequence (MS) as probing signals. Utilization of PCSK-signals permits an essential improvement of the radar image quality at the stage of its compression on azimuthal coordinate. Polyphase (p-phase where p is a prime number) probing signal with zero autocorrelation zone has been synthesized, which signal represents a sequence of p PCSK-pulses coded by complementary sequences with additional frequency shift-keying of the subpulses of pulses. A comparative analysis of the correlation characteristics of the synthesized three-phase signal with a PCSK-signal coded by ternary MS has been performed. Total correlation characteristics of the signal ensemble used in the mode of the radar aperture synthesis have been also analyzed. The analysis has revealed that in case of a mismatch by Doppler frequency, the level of side lobes of autocorrelation function (ACF) of the synthesized signal is comparable with the level of side lobes of ACF of the PCSK-signal coded by MS. The total ACF of the ensemble consisting on p2 signals has zero side lobes along the entire time axis τ. This makes it possible to use the signal in remote sensing radars to improve the quality of radar images.

中文翻译：

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离散频移键控和零自相关带的多相信号的遥感雷达

现代合成孔径雷达（SAR），例如用于地球遥感的空间SAR，使用具有线性频率调制的信号和具有由M序列（MS）编码的相移键控（PCSK）的信号作为探测信号。利用PCSK信号可以在雷达方位角压缩阶段显着改善雷达图像质量。已经合成了具有零自相关区域的多相（p相，其中p为质数）探测信号，该信号表示由互补序列编码的p PCSK脉冲序列，并带有脉冲的子脉冲的附加频移键控。已经对合成的三相信号与由三元MS编码的PCSK信号的相关特性进行了比较分析。还分析了在雷达孔径合成模式下使用的信号集合的总相关特性。分析表明，在多普勒频率不匹配的情况下，合成信号的自相关函数（ACF）的旁瓣电平与MS编码的PCSK信号的ACF旁瓣电平相当。由p2个信号组成的整体的总ACF在整个时间轴τ上具有零个旁瓣。这使得可以在遥感雷达中使用信号来提高雷达图像的质量。合成信号的自相关函数（ACF）的旁瓣电平与MS编码的PCSK信号的ACF旁瓣电平相当。由p2个信号组成的整体的总ACF在整个时间轴τ上具有零个旁瓣。这使得可以在遥感雷达中使用信号来提高雷达图像的质量。合成信号的自相关函数（ACF）的旁瓣电平与MS编码的PCSK信号的ACF旁瓣电平相当。由p2个信号组成的整体的总ACF在整个时间轴τ上具有零个旁瓣。这使得可以在遥感雷达中使用信号来提高雷达图像的质量。