伪码-线性调频复合信号快速参数估计方法

Fast parameter estimation approach of reconnaissance signal combined PRBC and LFM

针对常见的引信雷达信号参数估计算法计算量较大的缺点,提出了一种伪码-线性调频复合信号的快速参数估计算法。首先采用平方法消除了伪码调相,然后对得到的线性调频信号进行快速解线性调频处理,并用高精度频率估计参数重构了原线性调频信号,用其对原复合信号进行载波去除处理得到基带伪码调相信号,最后采用短时积分法提取了码速率。仿真与硬件实现表明,算法具有较高的参数估计精度且处理时间小于0.35 ms。

To lower the computational complexity of the common parameter estimation algorithm of reconnaissance signals combined pseudo-random binary phase code（PRBC） and linear frequency modulated（LFM）,a fast approach is presented.First,the square of the received signal is computed to eliminate the PRBC,then the fast dechirp algorithm is adopted to obtain the initial frequency and modulation slope,and both are used to reconstruct the LFM signal.The original signal is multiplied by the conjugated reconstructed signal to get the baseband signal of the PRBC.Finally,the code rate of PRBC is extracted by the short time integration method.Simulation and hardware implementation show that this approach has high accuracy,and the processing time is less than 0.35 ms.