Abstract

A sounding signal with zero autocorrelation zone (ZACZ) that represents a series of two phase-code-shift keyed (PCSK) pulses encoded with complementary sequences of the binary D code is synthesized for synthetic-aperture radars (SARs). Discretes of pulses of the synthesized signal are additionally linearly modulated with respect to frequency for suppression of side lobes (SLs) of the autocorrelation function (ACF) in the presence of the Doppler frequency mismatch. Correlation characteristics of the synthesized signal are compared with the characteristics of the signal without modulation of discretes and PCSK signal encoded with the M sequence (MS). Total correlation characteristics of an ensemble of signals are analyzed in the regime of synthesis of the SAR aperture. In the presence of the Doppler frequency mismatch, the level of all ACF SLs in the ZACZ of the synthesized signal is lower than the level of the MS-encoded PCSK signal. The total ACF of an ensemble of four signals has zero SLs along the entire time axis τ. In the presence of the frequency mismatch, the SL level of the ACF is lower than the SL level of the total ACF of the ensemble of four MS-encoded PCSK signals.

中文翻译：

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合成孔径雷达零自相关区的脉冲信号

摘要

对于合成孔径雷达（SAR），合成了具有零自相关区域（ZACZ）的探测信号，该探测信号表示一系列用二进制D码的互补序列编码的两个相移键控（PCSK）脉冲序列。在存在多普勒频率失配的情况下，针对频率对线性离散的合成信号脉冲离散度进行了抑制，以抑制自相关函数（ACF）的旁瓣（SLs）。将合成信号的相关特性与未经离散信号调制的信号特性和用M序列（MS）编码的PCSK信号进行比较。在SAR孔径合成方案中分析了一组信号的总相关特性。在多普勒频率不匹配的情况下，合成信号的ZACZ中所有ACF SL的电平都低于MS编码的PCSK信号的电平。四个信号集合的总ACF在整个时间轴τ上具有零个SL。在存在频率失配的情况下，ACF的SL电平低于四个MS编码PCSK信号集合的总ACF的SL电平。