正交解调中频误差对脉间变频雷达成像结果的影响

Effect of the Intermediate Frequency Error of Quadrature Demodulation in the Pulse to Pulse Frequency Shifting Radar Imaging

针对采用固定中频正交解调方法的脉间变频雷达可能存在的中频误差进行分析,得到在中频上进行正交解调不会对成像造成影响的结论。推导存在中频频率误差条件下的成像公式,分析误差影响的主要表现。通过仿真对比不同中频频率误差对二维成像结果的影响,得出成像结果随频率误差变化的规律,给出可以忽略此误差的条件。

The effect of the fixed intermediate frequency error in the pulse to pulse frequency shifting radar by means of the quadrature demodulation on the intermediate frequency is analyzed.The exact intermediate frequency has no influence on the radar imaging.The formulas of the effect of the frequency error are presented,and the 2-D imaging simulation results are given.Several simulation results under different conditions are contrasted.The influence on the imaging result caused by the frequency error is gained and the ignore rule is educed.