基于超宽带的 TOA-DOA 联合定位方法

针对现有的大多数超宽带(ultra-wide band,UWB)定位方法至少需要3个基站,系统开销较大的问题,提出一种新颖的基于波达时间-波达方向(time of arrival-direction of arrival,TOA-DOA)联合估计的定位方法,仅需一个基站即可准确快速定位目标.利用酋矩阵束算法估计视距信号TOA和最小二乘估计准则估计视距信号DOA,得到目标的相对坐标.Matlab仿真实验证明,该方法的TOA和DOA估计精度较高,定位精度达到厘米级,而且复杂度降低为矩阵束算法的1/4,采样频率为亚奈奎斯特速率,易于实现,是一种简单有效的定位方法.

Joint TOA-DOA estimation for UWB based positioning

To overcome the shortcoming of most available UWB positioning methods that they require at least three base stations therefore increase system cost, this paper presents a novel positioning method based on joint TOA-DOA estimation,which requires only one base station to position targets with high accuracy and low complexity. This method first applies unitary matrix pencil algorithm to estimate TOA of line-of-sight signal, then estimates its DOA by least square estimator, finally calculates the relative coordinate of the target using TOA and DOA estimates. Matlab simulation results prove that this method achieves centimeter order of position accuracy with sub Nyquist sampling rate and 1 /4 computation load of matrix pencil algorithm. Thus it is an effective,fast and easy implemented UWB positioning method.