螺旋桨目标的雷达回波信号相位解缠技术

Study on Phase-Unwrapping of Radar Signal Return from Aircraft Propeller

建立了螺旋桨的雷达回波信号模型。对模型回波信号的相位混叠效应进行了理论分析,讨论了回波相位混叠效应出现的原因,通过模型改进获得了螺旋桨的雷达回波相位的理论表达式。提出插值与可调门限相结合的算法和自适应数值积分算法两种相位解缠方法,分别用于桨叶数为偶数和奇数时的相位解缠。仿真结果表明:两种算法有较高的精度。

Mathematical model of blade-modulation（MMBM） of radar signal return from aircraft propeller was proposed in this paper.Through analyzing phase-overlapping phenomenon of radar signal return from aircraft propeller,the reason of phase-overlapping was discussed.The modified model of radar signal return from aircraft propeller was deduced and a theoretical unwrapped phase was achieved.The two phase-unwrapping algorithms that were interpolation-variable threshold algorithm and self-adaptive numerical integration algorithm were put forward,which were adapted to phase-unwrapping respectively.The simulation results showed that the two algorithms were very precise.