抗距离遮挡的雷达相位编码信号设计方法
A Design Method of Radar Phase Code Signals for Avoiding Range Eclipse

为了解决单基站雷达近距离或远距离回波信号接收不全造成的距离遮挡问题,设计了一种抗距离遮挡的新型相位编码信号――截短低旁瓣相位编码信号(TLS序列)。首先,建立最小化更新序列自相关旁瓣峰值或能量的非线性码元映射关系;然后,随机产生一个短的初始相位编码序列;最后,在此基础上按照所建立的映射关系映射得到具有指定码元数的TLS序列,并估计出所得序列集的互相关峰值。仿真结果表明,与m序列等传统序列相比,等码元数截取后,TLS序列在进行脉冲压缩处理后的平均自相关旁瓣峰值约低5 dB,且所得序列集具有较低的互相关峰值,可用作正交波形。
A novel design method of radar phase code signals truncated with low sidelobes (TLS sequence) for avoiding range eclipse is proposed to solve the range eclipse problem of single base station radars. The range eclipse is caused by the incompletely received echo signals from far or near. Firstly, a nonlinear code mapping relation is established to minimize the autocorrelative sidelobe peak or energy of the updated sequence. Then, a phase code signal with short code？？length is randomly generated as an initial sequence. Finally, the established mapping relation is used to obtain the TLS sequence with any given code？？length from the initial sequence, and the cross？？correlation peak of the resulting sequence set is estimated. Simulation results and comparisons with m？？sequence and other well？？known sequences show that the average of autocorrelative sidelobe peak of the whole effective sub？？signals truncated from a TLS sequence after pulse compression reduces by about 5 dB, and the resulting sequence set has a low cross？？correlation peak, which can be used as an orthogonal waveform