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 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.

TN957.52