基于数字信道化和空时频分析的多网台跳频信号DOA估计

Directions of arrival estimation for multi frequency-hopping signals based on digital channelized receiver and spatial time-frequency analysis

提出了一种基于数字信道化和空时频分析的多跳频信号DOA(direction of arrival)估计方法,该方法能够在欠定条件下(传感器数目小于信号数目)实现多个信号的精确测向。首先利用多相滤波器组实现数字信道化接收机的设计,然后对各子信道的数据进行时频分析,得到全景时频图;再在时频域提取跳频信号的有效hop,针对每个hop建立一个空时频矩阵;最后运用空时频方法估计每hop的DOA。仿真结果验证了方法的有效性。

An algorithm of DOA estimation for multi frequency-hopping signals based on digital channelized receiver and spatial time-frequency analysis was proposed, which can realize exact DOA estimation in underdetermined condition. First, the architecture of digital channclized receiver based on polyphase filter banks was realized. Second, a clear time-frequency representation was gained by time-frequency analysis. Third, effective hops were selected from the time-frequency distribution, and every hop＇s spatial time-frequency matrix was built. At last every hop＇s DOA was estimated based on spatial time-frequency method. The simulation results demonstrate that the estimation algorithm is effective and efficient.