相控阵雷达反演口径分布中的误差分析

为了预估相控阵雷达各部件的非理想性对反演天线口径幅相分布的影响 ,分析了相控阵天线移相器插损和移相误差、接收机噪声、接收机非线性和测相误差、A/D变换位数等对时序 Walsh- Hadamard相位权重反演天线口径幅相分布的影响。理论分析表明 ,Walsh- Hadamard变换对相控阵雷达的天线和接收机的误差和噪声有一定程度的平滑和抑制作用。在此基础上 ,以实际使用为背景 ,对各个环节的误差提出了要求。这些要求一般的雷达以及目前的技术都能够达到 ,因而系统的实现是可行的。

Error analysis for aperture distribution reconstruction of phased array antenna

Azimuth super resolution for phased array radar can be achieved by reconstructing the distribution of both amplitude and phase. The reconstruction is obtained through time sequence phase weighting. The imperfection of the components may affect the performance of the reconstruction. The influence of the imperfection is analyzed. This imperfection includes insertion loss and phase error of phase shifter, additional noise and nonlinearity in receiver, non uniformity between inphase and quadrature channels, quantization error in analog to digital converter and so on. It is indicated that Walsh Hadamard transform can reduce the influence of error and noise. The selection of the component parameters is also proposed. The requirements are quite raesonable to the conventional radar and existing techniques. The analysis presented may serve as a guidance in the design of this kind of radar and the estimation of the system performance.