卫星/伪卫星/惯性组合着舰导引算法

针对舰载机安全着舰对高精度、高可靠性着舰导引系统的迫切需求,研究了卫星/伪卫星/惯性组合着舰导引技术,基于几何精度因子(geometric dilution of precision, GDOP)计算提出了伪卫星在舰船上的布设方案,并设计了其导航电文结构。研究了卫星/伪卫星/惯性组合着舰导引算法,利用卫星及伪卫星的双差分载波相位信息,采用改进的模糊度最小二乘去相关平差(least squares ambiguity decorrelation adjustment,LAMBDA)迭代算法解算其双差分整周模糊度,并基于舰载机运动模型建立滤波方程解算出舰机相对运动信息,再与惯导数据进行信息融合得到高精度的导引信息。仿真结果表明,提出的卫星/伪卫星/惯性着舰导引技术横向定位误差在0.3m以内,纵向定位误差在0.1m以内,高度定位误差在0.3m以内,可以满足舰载机着舰的要求,与卫星/惯性组合导引相比,该组合方式大大提高了垂直方向的定位精度,这对于确保安全着舰极为重要。并且,提出的着舰导引技术不仅精度高,而且工作连续可靠、抗干扰能力强,对保障舰载机着舰安全有重要的意义。

Satellite/pseudolite/INS integrated navigation algorithm

To meet the urgent demand of a high precision〖JP〗, high reliability landing guidance system for carrier based aircraft landing safely, the satellite/pseudolite/inertial navigation system (INS) integrated landing navigation technology is studied. Based on the geometric dilution of precision (GDOP) calculation, the layout scheme of pseudolites on the ship and the navigation message structure are proposed. The satellite/pseudolite/INS integrated landing guidance algorithm is studied by using satellite and pseudolites dual differential carrier phase information, and the dual differential ambiguity is solved by using the improved least squares ambiguity decorrelation adjustment (LAMBDA) iterative algorithm. Through establishing filtered equation based on the carrier aircraft movement model, landing target motion information can be calculated. Finally, highly accurate navigation information can be obtained by fusing the inertial navigation data. The simulation results show that the lateral positioning error of the proposed satellite/pseudolite/INS integrated landing navigation technology is less than 0.3 m, and longitudinal positioning error is less than 0.1 m, and the height positioning error is less than 0.3 m, which can meet the requirements of carrier based aircraft landing. Compared with the satellite/inertial guidance algorithm, it greatly improves the positioning accuracy in the vertical direction, which is extremely important to ensure a safe landing. Furthermore, the proposed landing guidance technology is not only high precision, but also reliable and continuous operation, anti jamming capability, which is significant to the protection of carrier based aircraft landing safety.