一种GNSS信号模拟器高精度实时伪距计算优化方法

An optimized method of high precision and real-time pseudorange calculation in GNSS signal simulator

针对GNSS信号模拟器伪距计算的实时性和高精度需求,提出一种伪距计算的优化方法。该优化方法首先使用Hermite插值算法计算任意时刻的卫星位置,然后在迭代计算卫星发射时刻时不计算信道延迟量,并且针对不同动态条件选择不同的伪距时间间隔,插值计算伪距动态模型参数。与传统算法比较,该方法计算效率大幅提高。仿真结果表明:优化算法的伪距计算误差小于1mm,证明了该算法的良好性能。

Focused on the real-time and high precision pseudorange calculation of GNSS signal simulator, the optimization algorithm was provided. For the algorithm, firstly the Hermite interpolation algorithm was used to calculate the satellite position in any time, and then the channel delay was ignored on iterative calculation of satellite launch time.Meanwhile for different dynamic conditions, the pseudorange intervals were selected to calculate pseudorange dynamic model parameters. Compared with the traditional algorithm, the efficiency of this algorithm increases evidently. The simulation results show that the pseudorange calculation error of optimization algorithm is less than 1 mm, which confirms the good performances of the algorithm.