Pseudolite Close Proximity Static Position Solution Using Bias Kalman Filtering and Pseudorange Smoothing Techniques

摘要

Close proximity space operations require an accurate navigation solution when the line-of-sight to Global Positioning System (GPS) signals becomes blocked. The use of pseudolites in space applications can mitigate this problem. A navigation solution required to pinpoint the location of a static pseudolite receiver in an indoor lab is developed. By using calibration and position Kalman filters to remove code phase biases, unbiased pseudoranges are formed and a position is computed. A more accurate post-processed data solution is also developed from a pseudorange smoothing technique using carrier phases. In simulation, the final smoothed position solution was accurate to the centimeter level, and five-meter accuracy was achieved using lab test data.