Costas序列在多目标散射雷达系统中的应用研究

Study on the Application of Costas Arrays to Multiple Targets Scattering Radar Systems

在多目标散射环境中,雷达信号的模糊函数需要具有二维δ函数的"针状"特性,但事实上这样的信号是不存在的,因为信号的模糊体积是不变的。介绍了一种减小信号模糊体积的方法:雷达发射两个不同的Costas跳频编码序列信号,在接收端将两个信号模糊函数相乘,以减小两个信号模糊函数的边瓣,从而获得主瓣尖锐且模糊体积很小的"针状"特性。仿真结果验证了这种方法的可行性。

In the multiple targets scattering environment, radar signals need have an ambiguity function with a two dimensional delta-function characteristic. However such signal doesn＇ t exist due to the constant volume under the ambiguity surface. A method is introduced to reduce the signal ambiguity volume. Radar will transmit two different Costas arrays coded frequency hop signals, and the sidelobe of the two auto-am- biguities can be reduced by multiplying them in the receiver so that the ambiguity functions derive a main spike and little additional volume in the pedestal on the time-frequency plane. The feasibility of the method is justified through simulation.