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从时差频差联合定位方程组出发,基于牛顿迭代法求解定位结果,并从理论上分析定位误差,说明时差频差联合定位的特点。考虑到双机时差频差定位中固有的定位结果模糊和定位精度不高2个问题,提出三机联合定位,通过飞机的两两组合消除定位结果模糊,并通过数据融合提高定位精度。通过仿真验证三机定位相对于双机在解定位模糊和精度方面要优于双机定位。
Based on the joint positioning equations of time difference and frequency difference, the positioning results are solved based on the Newton iteration method, and the positioning errors are analyzed theoretically to illustrate the characteristics of joint positioning of time difference and frequency difference. Taking into account the inherent ambiguity of positioning accuracy and the low positioning accuracy in dual-frequency TDOA positioning, the joint positioning of three machines is proposed. The two-to-one combinations of aircraft are used to eliminate ambiguous positioning results and improve the positioning accuracy through data fusion. Through the simulation, it is proved that three-machine positioning is better than double machine positioning in resolving ambiguity and accuracy of positioning.