Estimation of GPS User Location Using Linearization Technique and Bancroft Algorithms

Abstract

This paper describes determination of GPS receiver position using Linearization technique and Bancroft algorithms. The position is determined by obtaining pseudo ranges from eight different GPS satellites. The measured ranges do not represent the true ranges as the signal coming from a GPS satellite will be contaminated by various errors like Ephemeris error; Propagation error in the form of Ionospheric and Tropospheric delays; Satellite and Receiver clock biases with respect to GPS Time (GPST); Multipath error etc. Most of these errors can be estimated accurately and can be accounted for. In this paper some standard mitigation techniques have been applied for the estimation of GPS errors and user position is then determined using the above two technique after making appropriate corrections. GPS data of Chitrakut station available in RINEX (Receiver Independent Exchange) format have been used for this purpose