零相位差-测向的随动二分法定位

The Servo Bisector Location Based on Direction Finding of Zero Phase Difference

针对射频无源定位中基于信号到达时间差(TDOA)定位模型因其双曲线非线性导致边缘测量误差放大单靠优化算法改进有限的问题,提出了基于零相位差-测向的随动二分法定位。该方法通过对测量天线的运动控制,获得误差最小测量位置,在此基础上通过电缆线延迟补偿法提高AD8302相位差测量精度,并对天线施加位置扰动获得精确角度,消除系统测量误差。对比分析了参数测量方差对此模型和正交TDOA模型几何精度因子(GDOP)的影响。并通过实验证实了此定位法相比于传统的TDOA定位法增大了定位范围,提高了定位精度。

The measurement error amplification problem,which is caused by the hyperbolic nonlinearity existing in the location model based on signal arrival time difference(Time Difference of Arrival,TDOA)for radio frequency positive location,can only be limitedly improved by optimization algorithm.Taking this into account,a servo bisector location method based on direction finding of zero phase difference was proposed.In this method,the measurement position with minimum error is obtained by controlling the motion of measuring antenna.On this basis,the AD8302 phase difference measurement accuracy is improved by the cable delay compensation method,and position disturbance is applied to antenna to obtain accurate angle to eliminate system measurement error.The effect of parametric variance on the geometric accuracy factor(GDOP)of this model and orthogonal TDOA model was analyzed and compared.Experiments show that this positioning method increases position range and improves position accuracy compared with conventional TDOA positioning method.