一种GPS信号码片内多径时延估计算法

针对全球定位系统(global position system, GPS)中延迟差小于一个C/A码片的多径时延估计问题，提出一种基于约束增量维纳滤波的多径时延估计算法。该算法利用GPS信号C/A码延时先验估计，对多径冲激信道时延估计值和衰减系数估计值进行区间约束和幅度约束，并将约束条件应用到增量维纳滤波的迭代过程中，从而实现码片内多径时延的估计。理论分析和仿真结果表明，此算法具有时空复杂度低、收敛快，在低信噪比条件下有较高的分辨率等优点。

Subchip multipath time-delay estimation algorithm for GPS signals

To solve the estimation problem of multipath time delay (MTD) which is less than a C/A code chip in the GPS system, a new algorithm of MTD estimation based on constrained incremental Wiener filter is proposed. By utilizing the time-delay priori estimation of GPS C/A codes, the support interval and magnitude constraints are applied to the time-delay estimation and attenuation coefficient estimation in multipath impulse channels, respectively. The subchip MTD can be estimated through an iteration process of the incremental Wiener filter under the constraint conditions. Theoretical analysis and numerical simulation results show that the proposed algorithm has a low temporal and spatial complexity, fast convergence, and high resolution with low SNR.