Abstract
Global Positioning System (GPS) is a worldwide satellite system that provides navigation, positioning, and timing for both military and civilian applications. GPS based time reference provides inexpensive but highly-accurate timing and synchronization capability and meets requirements in power system fault location, monitoring, and control. In the present era of restructuring and modernization of electric power utilities, the applications of GIS/GPS technology in power industry are growing and covering several technical and man-agement activities. Because of GPS receiver’s error sources are time variant, it is necessary to remove the GPS measurement noise. This paper presents novel recurrent neural networks called the Recurrent Pi-Sigma Neural Network (RPSNN) and Recurrent Sigma-Pi Neural Network (RSPNN). The proposed NNs have been used as predictor in GPS receivers timing errors. The NNs were trained using the dynamic Back Propagation (BP) algorithm. The actual data collection was used to test the performance of the proposed NNs. The ex-perimental results obtained from a Coarse Acquisition (C/A)-code single-frequency GPS receiver strongly support the potential of the method using RPSNN to give high accurate timing. The GPS timing RMS error reduces from 200 to less than 40 nanoseconds.
Highlights
Most descriptions of Global Positioning System (GPS) focus on its use as a system to provide precise latitude, longitude and altitude information
The experimental results obtained from a Coarse Acquisition (C/A)-code single-frequency GPS receiver strongly support the potential of the method using Recurrent Pi-Sigma Neural Network (RPSNN) to give high accurate timing
The observation data received by a low cost and single frequency GPS receiver manufactured by Rockwell Company
Summary
Most descriptions of Global Positioning System (GPS) focus on its use as a system to provide precise latitude, longitude and altitude information. Continuous access to precise time and frequency, at low cost and anywhere it is needed, is a revolutionary development The U.S DoD states very clearly in the Federal Radio navigation Plan (FRP) what SPS and PPS provide: (1) SPS is a positioning and timing service which will be available to all GPS users on a continuous, worldwide basis with no direct charge. The GPS L1 frequency contains a Precision (P) code that is reserved for military use and is not a part of the SPS. (2) PPS is a highly accurate military positioning, velocity, and timing service which will be available on a continuous, worldwide basis to users authorized by the DoD. For effective use of GPS timing information in power systems, it is essential to model and predict these errors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have