一种高精度液晶相控阵指向修正算法

电压的量化位数限制了波阵面相位的选择范围,导致波束的偏转角度偏离理想角度,从而降低指向精度。指向精度是液晶相控阵(LCPA)性能的重要指标之一。提出了一种提高指向精度的优化算法。该算法以最优化理论为依据,采用模式搜索方法,通过调整电压台阶的方式进行优化。首先分析了电压量化指向精度的影响,建立了波控模型,然后利用模式搜索法,以减小实际角度与理想角度之间偏差为目标进行相应的电压台阶修正。仿真结果表明,在扫描角度范围内,该算法能将归一化精度误差从100数量级降至10-3数量级,优化效果显著。

A Steering Correction Algorithm of Liquid-Crystal Phased Array with High Precision

Quantization digit of voltage limits the choice scope of wave front phase, causes actual angle deviating from ideal angle, and further decreases steering accuracy. Steering accuracy is one of the most significant performance indexes of liquid-crystal phased array (LCPA). An optimization algorithm is proposed aiming at improving steering accuracy. The algorithm is based on optimization theory; it adopts method of pattern search to optimize objective using the way of adjusting voltage staircase. The influence of voltage quantization on steering accuracy is analyzed first, and then model of wave control is established. Last the decreasing of deviations between actual angle and ideal angle is taken as objective to correct corresponding voltage staircases using pattern search. Simulation results show that the algorithm can decrease normalized accuracy error from order of 100 to 10-3 in the range of scanning angles, which is remarkable.