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依据某型精密进场雷达实时工作的信号体制,采用中频直接正交采样实现正交检波的方法完成数字中频信号处理。在Matlab仿真软件中对工作时的发射信号、回波中频信号进行计算机模拟和数字正交采样仿真,最后结合现场可编程门阵列提出中频数字化的工程设计方法。从仿真的结果来看,效果较好,可以较好地对接收的目标信号进行分析,从而进一步验证了正交解调方法的可行性,该方法可以在雷达信号处理当中加以广泛应用。
According to the signal system of a type of precision approach radar working in real time, the method of orthogonal detection by direct sampling of intermediate frequency is used to complete the digital intermediate frequency signal processing. In the simulation software of Matlab, we carry on computer simulation and digital quadrature sampling simulation of transmitting signal and echo intermediate frequency signal when working, and finally propose the digital intermediate engineering design method combined with field programmable gate array. The simulation results show that the method is better and the received signal can be well analyzed, which further verifies the feasibility of the quadrature demodulation method. This method can be widely used in radar signal processing.