Loran-C User Position Software (LUPS) Navigation Performance with PC-104 and DDC Receiver Flight Test Data in the New Jersey Area

摘要

The Loran-C User Position Software (LUPS) developed by ISTI was used to post-process PC-104 andrnDDC receiver data collected during the Federal Aviation Administration Technical Center (FAATC) 19 –rn22 June 2001 flight tests along the New Jersey to North Carolina coastal areas. This paper summarizes thernspecial features of LUPS and reports the achieved navigation performance in terms of accuracy, integrity,rncontinuity, and availability metrics. The results show a 95% accuracy of about 470 meters using the PC-rn104 and 320 meters using the DDC data relative to truth GPS horizontal positions. The difference isrnattributed mainly to the lower average number of signals available in the PC-104 compared to the DDCrndata (5.3 versus 7.6). For a total of 7.9 hours of normal receiver operation, the results show no integrityrnfailures in terms of Hazardously Misleading Information, less than 0.03% Misleading Information, betterrnthan 99.9% continuity in terms of the number of alarms raised, and better than 99.9% availability ofrn(formal) accuracy and integrity. Processing of more flight test data in various geographic areas isrnrecommended to increase the statistical confidence in these results and to effect system improvements.rnMore work needs to be done on the validation/calibration of the Fault Detection and Exclusion (FDE), asrnopposed to fault-free, protection levels.