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线性调频(LFM)信号是一种重要的脉冲压缩信号。由于其具有众多优良性能,在工程实践中得到广泛应用。在不同工作频率下,LFM信号具有不同的距离多普勒耦合系数,脉压后带来的不同测距误差给双波段雷达的航迹起始带来困难。针对该问题,首先分析了多普勒耦合系数对双波段雷达测距的影响,导出了双波段雷达的非线性量测方程组;然后,采用加权最小二乘(高斯-牛顿迭代)法对运动目标进行定位;最后,提出了双波段雷达下的航迹起始方法。蒙特卡洛仿真结果表明:该方法可以在不同波段测量模式下有效提高目标航迹起始的准确率。
Linear frequency modulation (LFM) signal is an important pulse compression signal. Because of its many excellent properties, it has been widely used in engineering practice. LFM signals have different range Doppler coupling coefficients at different operating frequencies, and different ranging errors caused by pulse pressure make it difficult to start the track of dual-band radar. In order to solve the problem, firstly, the influence of Doppler coupling coefficient on the ranging of dual-band radar is analyzed, and the nonlinear measurement equations of dual-band radar are deduced. Secondly, weighted least squares (Gauss-Newton iteration) Target positioning; Finally, proposed a dual-band radar track initiation method. Monte Carlo simulation results show that this method can effectively improve the accuracy of target track initiation in different waveband measurement modes.