I/Q通道相位不一致对LFM脉压性能的影响

Influence of Disagreement between I/Q Phases on the Performance of LFM Pulse Compression

推导了存I/Q通道相位误差的情况下的LFM脉冲压缩输出信号的表达式,定量分析了I/Q通道相位不一致性对LFM脉冲压缩性能的影响,为雷达接收机系统设计中I/Q通道相位误差的控制提供了理论的参考依据。理论分析和计算机仿真表明,在采用加窗方式抑制脉冲压缩输出旁瓣的情况下,I/Q通道的相位误差会脉冲压缩输出的主副比性能产生严重影响。

This paper presents an expression of pulse compressed Linear Frequency Modulation （LFM） signal with I/Q phase error. The influence of the error on the performance of LFM digital pulse compression is analyzed in detail, a theoretical reference for controlling I/Q phase error in radar receiver designing is provided. The theoretical analysis and the simulating result show that the I/Q phase error will badly influence on the ratio between mainlobe and sidelobe of LFM digital pulse compression with window function for restraining the sidelobe.