| Title | Alternate Waveforms for a Low-Cost Civil Global Positioning System Receiver |
|---|---|
| Record ID | 42101 |
| Personal Name Creator |
Vandevenne, Herman F.; Kelly, Edward J. |
| Source | 128p. in various pagings |
| Corporate Creator | Massachusetts Institute of Technology; John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. Department of Transportation. Federal Aviation Administration |
| Publication Date | 19800601 |
| Language | English |
| Abstract | This report examines the technical feasibility of alternate waveforms to perform the GPS functions and to result in less complex receivers than is possible with the GPS C/A waveform. The approach taken to accomplish this objective is (a) to identify, after a quick broad overview, a few promising waveforms, (b) to complete the architectural synthesis of a GPS system based on the new waveforms, (c) to analyze the performance of these systems in providing ranging and communication capability and (d) to assess the impact on receiver hardware and software. One conclusion is that the class of pulsed waveform, when combined with emerging matched filter technology, permits the use of a greatly simplified receiver design. A major part of the report consists of description of a pulse-based GPS design. Although very specific, the design was intended as a vehicle for performance analysis only and many refinements and alternatives within the same class are possible. Other classes of waveforms such as tone ranging and chirped FM waveforms, although adequate, do not seem superior to the present PN encoded CW waveform for GPS. Finally, if the 'alternate' waveform is simply the present C/A waveform but with a substantially increased power level, it is shown that with the present designs the performance will be greatly increased or, alternatively, performance margin can be traded for a simplified receiver implementation. |
| Public Note | Introduction, Review of waveform choices, Use of present C/A waveform with more power, A TDMA pulsed GPS waveform, A TDMA tone ranging GPS waveform, PRFDMA waveform, Implications of the TDMA format, Appendices |
| Rosap ID | dot:9356 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9356 |
| TRT Terms | Global Positioning System; Navigation devices; Waveform analysis; Civil aviation |
| General Subjects | Global positioning system; Navigation receiver; Ranging waveforms; Tone ranging; Clock stability; CCD matched filter application; Charged coupled devices; Chirp filters; Civil aviation; Peak power |
| Classification | NTL - AVIATION - Air Traffic Control |
| Geographical Coverage |
United States |
| OCLC | 6498044 |
| Contract Number | DOT/TSC-RA-78-06 |
| Report Number | DOT-TSC-FAA-79-24; FAA-EM-79-16 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/42000/42100/42101/DOT-TSC-FAA-79-24.pdf |
| Format | |
| Database | NTL Digital Repository |