基于LFM-BPSK 信号的距离像成像方法

针对雷达通信一体化系统中雷达成像与通信共享信号的设计,分析了常见的一体化信号设计模式。首先,利用线性调频信号相位调制传递通信信息,设计了一种基于线性调频—二进制相移键控(LFM-BPSK)调制的雷达通信一体化信号,并给出了运动扩展目标的回波信号表达式;其次,通过计算单脉冲回波信号采样的逆离散傅里叶变换或离散傅里叶变换,提出了基于一体化信号合成高分辨距离像方法;然后,依据相位因子对傅里叶变换的影响,分析了多普勒效应对一体化信号合成距离像的影响;最后,对一体化信号的雷达成像性能进行了仿真计算。

A Method of Synthesizing Range Profile Based on LFM -BPSK Signal

In allusion to the design of a sharing signal for radar imaging and communication in integrated radar and communication system, a general design mode is analyzed for integrated signal. First, an integrated radar and communication signal is designed based on LFM-BPSK modulation, which can transmit with communication information phase modulation. The expression is given for the echo signal from an extended target. Secondly, by way of computing inverse discrete Fourier transform or discrete Fourier transform of echo signal sample, a method of synthesizing range profile is proposed based on integrated signal. Then, according to the effect of phase factor on fourier transform, the influence of Doppler effect on synthesizing range profile is analyzed for the new integration signal. Finally, some simulation is provided for verified the theoretic analysis in radar imaging performance of the new signal.