论文部分内容阅读
本文对卫星导航增强终端的天线阵多径抑制方法展开研究,设计多相关器数字接收机结构.天线阵各阵元接收信号数字化后,在导航接收机的每个通道内,相关处理出各阵元接收该通道跟踪卫星的载波相位,进行相干信号二维来波方向估计、数字波束形成,跟踪相应卫星信号,抑制其多径.本文研究分析了立体阵来波方向估计方法,及立体阵估计相干来波方向的去相干方法.电偶极子组成立体天线阵——球体阵,接收相干来波,体积小,结构紧凑.X,Y,Z轴三个线阵分别采用前后向平滑技术去相干,组成去相干后的接收数据相关矩阵,用MUSIC方法估计出相干来波的二维方向,不需要对估计出的来波方向进行匹配.结合卫星直达信号来波方向的导航电文处理结果,确认多径的来波方向.本文仿真中用估计出的卫星直达信号来波方向和多径信号来波方向形成权值,使天线阵波束形成指向卫星直达信号方向,零陷指向多径入射方向,抑制多径干扰.
In this paper, we study the multi-path suppression of antenna array in satellite navigation enhanced terminal and design the structure of multi-correlator digital receiver.After digitizing the received signals of each antenna array, in each channel of navigation receiver, Yuan to receive the channel tracking satellite carrier phase, the coherent signal to the two-dimensional wave direction estimation, digital beamforming, tracking the corresponding satellite signal, inhibit its multipath.This paper analyzes the three-dimensional array of direction of arrival estimation method, and the three-dimensional array estimation Coherence to the direction of the wave to the coherence method.Electrode dipole composed of three-dimensional antenna array - ball array, to receive the coherent wave, small size, compact structure.X, Y, Z axis three front and rear smoothing techniques are used Coherent to form the correlation matrix of the received data after the decorrelation, the two-dimensional direction of the coherent incoming wave is estimated by the MUSIC method, and no matching of the estimated incoming wave directions is needed. Combined with the processing result of the navigation message in the direction of the satellite direct signal, Confirm the incoming direction of multipath.Using the estimated satellite direct signal to wave direction and multipath signals to form the weights in the direction of wave, Satellites direct signal direction, zero-point multi-path radial direction of entry, inhibition of multipath interference.