Digital Tone Ranging Modem. Design and Implementation.
Final rept. Jul 71-Jun 72,
TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MASS
Pagination or Media Count:
The report describes a digital ranging modem implementation based on side-tone ranging concepts. The ranging technique implemented and tested in the DOTTSC avionics laboratory has direct application to the AEROSAT surveillance system. The performance of a breadboard unit was observed in the laboratory as well as under actual aeronautical and maritime experiments conducted with the NASA ATS-6 satellite. The technique demonstrated an acquisition probability of 0.98 for a signal-to-noise power density ratio, CNo, of 37 dB-Hz. The ranging precision of the modem for CNo50 dB-Hz is less than 66 meters. Circuit schematics, test data, test results and analyses are included in this report along with recommendations for future applications of the demonstrated hardware.
- Air Navigation and Guidance