瞬时频率估计的水下运动目标参数估计方法

摘要

针对水下运动目标的参数估计，建立了目标与水听器相对运动形成的多普勒模型．提出利用互L-Wigner分布（ cross L-Wigner distribution， XLWD）作为瞬时频率估计器，精确估计水听器接收到的目标辐射线谱信号的多普勒频移，同时也获得信号的时变幅值，进而通过加权非线性最小二乘法估计得到水下运动目标的参数．海试数据分析表明，相对估计误差在20％以内时，正横距离和速度估计值的概率分别大于0．85和0．96，试验结果验证了方法的有效性．%In order to estimate motion parameters of an underwater object, a Doppler model was constructed based on relative motion between acoustic source and receiver. The cross L-Wigner distribution ( XLWD) was applied to precisely estimate the Doppler shift of the radiated tone noise as instantaneous frequency estimator. In the mean-time, the time-varying amplitude of the received Doppler signal was obtained by XLWD. Then the motion parame-ters of the underwater moving object were estimated by a weighted nonlinear least square algorithm. The results of sea data analysis show that the probabilities that the magnitudes of the relative errors for the estimated abeam range and speed that are within 20% of the actual values are greater than 0.85 and 0.96, and it validates the proposed method.