摘要
目标与观测平台之间径向加速度引起的接收信号多普勒频率变化率的精确估计对于高精度单站无源定位与跟踪具有重要意义。该文针对脉内相位调制信号的频率变化率不能直接表征多普勒频率变化率的问题,首先引入相位补偿的方法消除BPSK相位调制序列的影响,然后针对固定脉冲重复频率和脉冲重复频率抖动两种情况分别提出了径向加速度引起的多普勒频率变化率的精确估计方法,并且给出了多普勒频率变化率与采样频率、观测时间及脉冲重复频率之间的约束关系。仿真结果表明,典型参数条件下该文提出算法的信噪比门限比已有算法低约4～6dB。
The precise passive locating and tracking technology for a single observer demands high accuracy estimation of Doppler frequency rate produced by the radial acceleration between the target and the observer from the received signals. The frequency rate cannot denote the Doppler frequency rate for the PSK signal. A phase compensation based algorithm for Doppler frequency rate estimation from BPSK coherent pulse train is presented to conquer the problem. Both the fixed and alterable pulse repetition frequency （PRF） cases are considered. The limitation between the Doppler frequency rate and the sampling frequency,the observing time and the PRF is given. The simulation results show that the proposed algorithm achieves a 4～6 dB lower SNR threshold than the known ones in the typical condition.
出处
《电子与信息学报》
EI
CSCD
北大核心
2010年第9期2156-2160,共5页
Journal of Electronics & Information Technology
