| Title | Loran-Based Buoy Position Auditing Systems - Analytical Evaluation |
|---|---|
| Record ID | 50352 |
| Personal Name Creator |
Wolfson, J. A.; Engels, P. D.; Poppe, M. C., Jr.; Foltz, J. M.; DePalma, L. M. |
| Source | 256p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Corporate Contributor |
United States. Coast Guard |
| Publisher | United States. Coast Guard |
| Publication Date | 19800201 |
| Language | English |
| Abstract | An analytic evaluation and comparison of the following candidate Buoy Position Auditing System (BPAS) configurations is presented in this report: transmission of digital Time Difference (TD) data from a Loran-C receiver on the buoy, retransmission of Loran-C pulses from the buoy, and combination of helicopter Loran-C data and helicopter-to-buoy microwave ranging data in a variable geometry solution. The candidate BPAS configurations utilize Loran-C in the differential mode. A model is developed to characterize differential Loran-C errors, accounting for the expected effect of the land/sea water conductivity interface. The error model is utilized alone, or with a microwave ranging system error model, to estimate buoy position-fix accuracy afforded by each BPAS configuration. Accuracy estimates and data on cost, complexity, and technical risk are employed to recommend a BPAS configuration for testing. It is concluded that Loran-C pulse retransmission is not a viable BPAS configuration. The variable geometry BPAS configuration is highly accurate, due to calibration of Loran-C errors by processing of redundant data, but is not presently cost-effective. The digital TD transmission BPAS configuration is recommended for testing, due to its simplicity and low cost. |
| Rosap ID | dot:11741 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/11741 |
| TRT Terms | Accuracy; Buoys; Digital computers; Errors; Helicopters; Loran; Mathematical models; Position fixing; Radio receivers; Radio transmitters; Rangefinders; Variables |
| Classification | NTL - MARINE/WATERWAYS TRANSPORTATION - MARINE/WATERWAYS TRANSPORTATION; NTL - MARINE/WATERWAYS TRANSPORTATION - Marine Planning and Policy; NTL - MARINE/WATERWAYS TRANSPORTATION - Marine Safety; NTL - MARINE/WATERWAYS TRANSPORTATION - U.S. Coast Guard |
| Geographical Coverage |
United States |
| Report Number | TSC-USCG-80-2; USCG-D-09-80 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/50000/50300/50352/DOT-TSC-CG-80-02.pdf |
| Format | |
| Database | NTL Digital Repository |