基于LFM的双波段雷达航迹起始方法

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。

The Algorithm of Track Initiation for Dual-band Radar Based on LFM Signal

The signal using linear frequency modulation technology is an important pulse compression signal. Because of its various excellent properties, it has been widely used in the actual engineering project. As a result of carriers at different frequencies, chirp signals will have different range-Doppler coupling coefficient. After the pulse compression, the ranging error caused by dual-band radar will make track initiation difficult. In order to deal with this problem, this article explains the influence of different range-Doppler coupling coefficient in the measurement of the dual-band radar, and exports the nonlinear equations of the dual-band radar measurement. Then the weighted least squares (Gauss-Newton iteration) algorithm is applied to calculate the initial state of moving radar target. Finally, the algorithm of track initiation for the dual-band radar based on LFM signal is proposed. Monte-Carlo simulation results show that this method can effectively improve the accuracy rate of moving target track initiation when the radar works under different wavelengths mode.