脉冲超宽带系统中基于改进传播算子算法的TOA和DOA联合估计

摘要

该文提出脉冲超宽带(Impulse Radio Ultra WideBand, IR-UWB)系统中一种基于改进传播算子算法(Propagator Method, PM)的到达时间(Time-Of-Arrival, TOA)和波达方向(Direction-Of-Arrival, DOA)联合估计方法。首先直接对接收信号的频域形式建模，然后采用改进的PM算法估计出两根天线的TOA参数，最后由两根天线的到达时间差计算出信号的DOA参数，从而达到TOA和DOA联合估计的目的。该算法无需谱峰搜索就可直接得到TOA和DOA的闭式解，且可以实现参数自动配对，大大降低了复杂度。最后给出了该算法的大量实验仿真，以及与现有算法的比较，仿真结果验证了该方法的可行性、稳健性和优越性。%An improved Propagator Method (PM) is proposed for joint Time-Of-Arrival (TOA) and Direction-Of-Arrival (DOA) estimation in Impulse Radio Ultra WideBand (IR-UWB) system. After modeling the received signal in frequency domain, the proposed algorithm estimates the TOA parameters in two antennas, and obtains the DOA parameters via the difference of the TOAs between the two antennas, thereby gains the joint TOA and DOA estimation. The proposed algorithm can obtain the closed-form solutions of the TOA and DOA parameters without spectral peak searching and these solutions can automatically get paired, thus significantly reduces the complexity. An amount of simulation experiments about the proposed algorithm and the comparisons with the existing algorithms are given. Simulation results verify the practicability, robustness and superiority of the proposed algorithm.