基于CDMA蜂窝网的飞行器三维定位算法

 针对中低空飞行器提出了一种将码分多址(CDMA)蜂窝网导频信号被动定位与惯性导航系统进行组合的导航定位方法。该定位方法是根据CDMA蜂窝网导频信号的到达时差（TDOA）进行两次加权最小二乘解算，并利用飞行器惯性组合的原始信息进行解模糊，从而实现中低空飞行器的三维实时定位。蒙特卡罗仿真证明：在高斯白噪声条件下，该算法运算速度快，精度高，其均方误差逼近克拉美罗下界（CRLB），为组合导航实时性要求提供了理论参考。

3D Localization Algorithm of Aircraft Based on CDMA Cellular Network

A navigation and localization method for a middle- and low-altitude aircraft is proposed which integrates passive localization using pilot signals from a code division multiple access(CDMA) cellular network with an inertial navigation system(INS). The method calculates weighted least squares twice according to the time difference of arrival (TDOA) of pilot signals from a CDMA cellular network, and then utilizes the original information of INS to resolve ambiguity, thus finally accomplishing the three-dimensional real-time localization of the middle- and low-altitude aircraft. In the Gaussian white noise condition, Monte Carlo simulation shows that the algorithm is of high computing speed and high precision, and that the mean square error approaches Cramer-Rao lower bound (CRLB). Hence it provides a theoretical reference for real-time requirements of integrated navigation.