GPS User Equipment Performance Evaluation.
Abstract
The significance of this research and development project to the Air Force is that it provides for a hot-bench simulation facility to validate GPS (Global Positioning System) User Equipment performance under various flight dynamics and environments and provides a data base for comparison with flight test results. This would also enable systematic evaluation of the performance of the GPS User Equipment in a simulated hostile electromagnetic environment. This simulation includes the generation of: GPS RF signals, jammer RF signals, white Gaussian noise, GPS navigation data, on-board sensor signals (i.e. IMU and altimeter), path loss and antenna pattern. As part of the simulation, error models for various functions and phenomena including IMU, altimeter, ionospheric and tropospheric delay, gravity anomaly, ephemeris, and clock error are included. The simulator precisely couples the changes in RF signals to the physical dynamics of the system (i.e., user, satellite, and jammer motions), including lever arm effects. The GPSE is currently designed to simulate five GPS satellite RF signs and five jammer RF signals. The entire simulation is under computer control in real time, utilizing as the input pre-computed data defining the user flight profile, jammer, and satellite motion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1979
- Accession Number
- ADA084842