论文部分内容阅读
在海底是起伏不大的非均匀薄层的假设条件下,建立了底混响空间相关函数模型。当混噪比较高时,模型中空间相关函数相位等于基元间垂向矢量与波数的乘积。对于平面阵而言,基元间垂向矢量是由于基阵载体姿态引起的。因此,可以给出底混响空间相关函数相位与载体横摇角和纵摇角之间的关系式。如果接收阵存在3个接收基元,它们对应平行四边形面积与对角线之比不小于半波长,那么可以通过解方程组的方法得到横摇角和纵摇角的确定解或优化解。由于相位模糊的存在, 解的范围是有限的。通过Fisher信息矩阵得到了这种方法姿态估计的Cramer-Rao下限。仿真实验和海试结果表明这种方法是可行的。
Under the assumption that the seabed is a non-uniform thin layer with little fluctuation, a correlation function model of the bottom reverberation space is established. When the noise ratio is high, the phase of the spatial correlation function in the model is equal to the product of the vertical vector and wavenumber between the primitives. For a planar array, the vertical vector between the elements is due to the attitude of the substrate carrier. Therefore, we can give the relationship between the phase of the reverberation space correlation function and the carrier roll angle and pitch angle. If there are 3 receiving elements in the receiver array, their ratio of the area of the parallelogram to the diagonal is not less than half the wavelength, then the solution or the optimal solution of the roll angle and the pitch angle can be obtained by solving the system of equations. Due to the existence of phase ambiguity, the scope of solution is limited. The Cramer-Rao lower bound of attitude estimation for this method is obtained by Fisher information matrix. Simulation and sea test results show that this method is feasible.