外辐射源雷达运动目标信号特性及检测方法研究

以调幅广播为信号源的短波外辐射源雷达系统需进行信号长时间积累以检测微弱目标信号,目标运动变化会导致多普勒频率展宽,传统积累检测方法检测性能下降,针对这一问题提出了基于运动补偿的积累检测方法。建立了动目标回波模型;介绍了基于多项式拟合积累检测算法原理;分别通过仿真数据和试验数据进行补偿,验证目标运动补偿前后信噪比得益;并利用计算机仿真建模方法验证了该积累检测算法的检测性能;在此基础上分析了补偿后的理论损失及搜索步长的参数获取,并评估了目标运动补偿方法的运算量。

Characteristics and Detection of Moving Target Signal of Radar System Based on External Radiation Source

Shortwave external radiation source radar system,which adopts AM radio as the signal source,needs a long time for signal accumulation to detect the weak target signal.The movement of the tar-gets will expand Doppler frequency,so the performance of traditional accumulation detection method will drop.An accumulation detection method based on target movement compensation is presented to solve this problem.The echo model of moving targets is described.The polynomial fitting accumulation detection algo-rithm principle is introduced.The compensation via simulation data and test data is made to verify the benefit of signal noise ratio before and after compensation target movement.Computer simulation is made to verify the detection performance of the accumulation detection algorithm.The computational load of the target movement compensation method is also evaluated.