GNSS自适应抗干扰天线阵相位中心校正

Phase Center Correction for GNSS Adaptive Anti-Jamming Antenna Array

为在干扰环境实现实时精密定位、测距和姿态测量等应用,需要尽可能降低天线阵相位中心引起的误差.建立了抗干扰天线阵相位中心补偿模型,每个阵元视作多相位中心天线,推导了自适应抗干扰天线阵等效相位中心位置的计算方法,分析了抗干扰RTK系统中由相位中心偏移引起的误差.通过补偿载波相位观测量,实现了天线阵相位中心校正.仿真结果表明,GNSS接收机抗干扰天线阵等效相位中心的位置与干扰环境及所用抗干扰算法有关,不能通过预先建立固定查找表的方式进行补偿,只能根据抗干扰计算结果实时计算出等效相位中心位置,再补偿载波相位观测量.

To implement precise position and measurement of location and attitude in the presence of interference,the error induced by antenna array phase center offset should be reduced as much as possible.A phase center compensation model was established for anti-jamming antenna array.Taking every element of the array as antenna of the multiple phase center,a calculation method was derived to get the equivalent phase center position of adaptive anti-jamming antenna array.And the error induced by phase center offset in anti-jamming RTK system was analyzed.Phase center offset of antenna array was corrected by compensating carrier phase observable.Simulation results show that the position of equivalent phase center of antenna array varies with interference and adopted algorithms.Correspondingly,error induced by phase center offset cannot be compensated using fixed lookup table,but can be compensated with the carrier phase observable corrected by the anti-jamming calculation result in real time.