Optimal Recursive Least-Squares Filtering of GPS Pseudorange Measurements
نویسندگان
چکیده
Code pseudorange measurement noise is one of the major error sources in Precise Point Positioning. A recursive least-squares solution with proper functional and stochastic modelling would help to exploit in addition the ultra high precision of the carrier phase measurement. Analyses of different methods, including phase smoothed, phase connected and phase adjusted pseudorange algorithm, will show that the phase adjusted pseudorange algorithm is statistically optimal. Static and kinematic experiment results also support the conclusion with more than 30% of improvement by going from the phase smoothed to the phase adjusted algorithm.
منابع مشابه
Robust Estimation Techniques for GNSS Positioning
Tracking and navigation problems are often solved using estimation methods that are based on least-squares and Kalman filtering techniques. It is well known that these classic methods are sensitive to unexpectedly large measurement errors. In this article we discuss some robust static and dynamic estimation methods that are designed to be insensitive against outlying observations. Positioning s...
متن کاملThe Autocovariance Least Squares Technique for GPS Interference/Jamming Detection
Abstract: In this paper, the Autocovariance Least Squares (ALS) technique is proposed for detecting the Global Positioning System (GPS) measurements’ interference or jamming. The interference is modeled by a moderate increase in the measurements noise covariance matrix while jamming is modeled by a larger increase in the measurements noise covariance matrix. The method makes use of the dynamics...
متن کاملThe Key to GNSS Ambiguity Resolution
One of the major obstacles in resolving ambiguities for longer baselines is the presence of unmodeled ionospheric delays. One technique to deal with this problem is to include ionospheric delay parameters in the observation equations, and estimate them as unknown states. The purpose of this article is to analyze this technique in light of the future signals that will be available through GPS mo...
متن کاملBasics of the GPS Technique: Observation Equations§
2. GPS DESCRIPTION................................................................................................................................................2 2.1 THE BASIC IDEA ........................................................................................................................................................2 2.2 THE GPS SEGMENTS...........................................
متن کاملSimultaneous State Estimation of UAV Trajectory Using Probabilistic Graph Models
For many airborne sensor applications, knowledge of the aerial platform’s position and velocity assists in construction of the target image and mapping the resultant model onto a surveyed map. Since sensor data is processed during post-processing, emphasis is placed on an accurate trajectory estimate as opposed to a real-time navigation. In this paper we present a smoothing approach for integra...
متن کامل