文中就全球定位系统(GPS)姿态确定系统中抗干扰问题,提出基于自适应阵抗干扰结构的双星定姿算法。首先提出抗干扰定姿接收机结构,采用去耦最大似然法(DEML)方法估计出卫星信号在载体坐标系中的到达角(DOA),然后利用直接法求解出载体姿态。仿真分析了不同方位、不同更新速率和不同强度下干扰源对总姿态误差的影响,结果表明该算法在强干扰环境下具备较高的定姿精度和鲁棒性。

The anti-jamming problem of GPS attitude determination system was studied and a two-satellite attitude determination algorithm based on adaptive array was proposed. Based on anti-jamming attitude determination receiver structure, the satellite signal DOA in carrier coordinate system was estimated by DEML at first, and then the carrier attitude was solved by direct method. The effect of interference source under different direction, different update rate and different power on total attitude error was simulated, the result shows that the attitude determination algorithm features high precision and robust under the condition of strong interference.