详情

原文传递 GPS Carrier-Phase Frequency Transfer on the NIMA Monitor Station Network

题名：	GPS Carrier-Phase Frequency Transfer on the NIMA Monitor Station Network
作者：	Tolman, B W;Munton, D;
关键词：	GLOBAL POSITIONING SYSTEM, ZGLOBAL POSITIONING SYSTEMZ, TRANSFER, ZTRANSFERZ, FREQUENCY, ZFREQUENCYZ, ARTIFICIAL SATELLITES, ZARTIFICIAL SATELLITESZ, SYMPOSIA, ZSYMPOSIAZ, RECEIVERS, ZRECEIVERSZ, COMPUTER PROGRAMS, ZCOMPUTER PROGRAMSZ
摘要：	The National Imagery and Mapping Agency (NIMA) maintains a worldwide GPS Monitor Station Network (MSN). We are in the process of studying carrier-phase frequency transfer as one method for understanding the overall network performance, and for potential use in testing future GPS receivers. We have developed processing software that uses 30-second dual frequency data in a continuous sequential estimator, which allows unlimited forward processing as well as optional backwards (fixed-interval) smoothing. States in the estimation include tropospheric and ionospheric delays, corrections (assumed small) to the station positions, and double-differenced carrier-phase biases. Satellite positions are taken from either precise or broadcast ephemerides. We have tested our process using both zero-baseline datasets and benchtop tests. Our initial results indicate that instabilities seen in the estimated time offsets are dominated by temperature variations coupling to the GPS receiver used.
总页数：	12
报告类型：	科技报告