Radar Field Measurements For The Dynamic DGPS Calibration System Design And Implementation

Nowadays, using GPS to calibrate the accuracy and characteristics of radar measurements is a common way in test and evaluation experiments of dynamic performance for the radar. Common GPS receivers are affected by many factors, such as the SA interference, ionosphere delay, troposphere delay, ephemeris error, satellite clock error and other factors, so the positioning accuracy inevitably can not meet the reqirements of calibration system of the performance for modern radar. Differential GPS (DGPS) technology is a trend for radar calibration.This paper mainly studied the design and implementation of a pseudo-range differential GPS bases on the GPS-OEM board, and presented the test methods and measured results of dynamic performance of the outfield radar with DGPS system.Based on the characteristics and needs of the calibration for the radar measurement accuracy and characteristics, the Introduction section introduces the development status of GPS and DGPS, presents the significance and main content of this research.The second chapter introduces the principle of GPS.The third chapter introduces the reasons of the GPS error, and hence educes the principle and implementation approach of the DGPS.The fourth chapter mainly studies the design and implementation of a pseudo-range differential GPS the bases on GPS-OEM board. The paper firstly presents the overall scheme of the pseudo-range DGPS bases on GPS-OEM board, and then emphatically introduces the design of the software for calculating the differential correction data from original information received by the OEM board and for compiling calculated data into the standard RTCM SC-104 format data. Finally, mobile station receives differential correction information from the base station and processes to export high-precision location information. The results of static and low dynamic tests show that real-time positioning accuracy reaches meter-level and meets the dynamic and high-precision requirements for the radar calibration,The fifth chapter introduces a calibration experiment using pseudo-range DGPS constituted with the GPS-OEM board. The real-time measurement data show that this system completes the calibration for dynamic performance of the radar. The system possesses many advantages, such as high accuracy, large measurement range, little affection from the climate and environment, quick handle of the data, agile location,so the system meets the calibration requirements for a wide range of radar performance indices.