机载双天线模糊相位差和多普勒频率联合定位

An Airborne Passive Location Method Based on Ambiguous Phase Difference and Doppler Frequency with Only Two Antennas

研究机载单站利用双天线对固定辐射源进行无源定位的技术。首先介绍仅利用相位差变化率的全空域网格搜索定位法,然后对其进行改进,采用边沿相关来测时差,将全空域搜索缩小为扇形搜索,从而大幅减少了计算量。针对定位结果对飞机姿态精度敏感的问题,提出一种模糊相位差和多普勒频率联合定位算法,并通过仿真验证了算法在定位精度和收敛速度上的优越性。

This paper focuses on the airborne single observer passive location method for fixed target with only two antennas. Firstly, the full-space scanning method based on phase difference change rate is introduced. Because of the huge calculation cost, this method is improved in this paper. The edge correlation algorithm is used to measure the time difference between the two antennas, which reduces the full-space scanning to sector scanning. As a result, the calculation cost decreases a lot. Then a passive location method based on ambiguous phase difference and Doppler frequency is proposed to solve the problem that the location result based on phase difference change rate is sensitive to the measurement accuracy of airplane＇s attitude. Finally, the simulation results indicate that the proposed method can achieve higher location precision and convergence speed.