基于CDMA蜂窝网的定位算法

A Location Algorithm Based on CDMA Cellular Network

基于TDOA的经典定位Chan算法主要针对地面移动台,针对中低空飞行器,将Chan算法推广到三维空间,并与飞行器上的惯导系统进行实时组合导航定位。主要思想是根据CDMA蜂窝网导频信号的到达时差(TDOA)两次使用加权最小二乘解算,吸收taylor算法的递推思想,得到飞行器位置的两组解。利用惯导系统提供的位置信息进行解模糊,从而得到飞行器的实时位置信息。仿真结果表明,在相同条件下,与其他经典算法相比,此算法定位精度高,定位运算速度快,其均方误差逼近克拉美罗界(CRLB),对中低空飞行器定位具有一定的参考价值。

Chan classic position algorithm based on TDOA is primarily intended for mobile base station on the ground. This paper focuses on low-altitude aircraft, and extends Chan algorithm to three- dimensions space and inertial navigation system （INS） on the aircraft is used for real-time integrated navigation. Main idea is that the location algorithm is using the arrival of time difference （TDOA） of CDMA cellular network pilot signals to make twice weighted least squares and absorbing recursive thought of Taylor algorithm and get vehicle＇s location solutions and taking use of the original information of INS to eliminate fuzz. Finally this paper obtains aircraft real-time location solution. Simulation shows that compared with other classical algorithm under the same conditions and the algorithm is of high speed and high precision,the mean square error approach Cramer-Rao Lower Bound （CRLB）. The algorithm has some reference value for Low- altitude aircraft location.