Author(s): W. N. Dean and D. P. Roth
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 23, Number 4
Pages: 287 - 297
Cite this article: Dean, W. N., Roth, D. P., "THE AN/BRN-5 LORAN RECEIVER", NAVIGATION, Journal of The Institute of Navigation, Vol. 23, No. 4, Winter 1976-1977, pp. 287-297.
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Abstract: The AN/BRN-5 is a part of the Poseidon upgrading of the Ballistic Missile submarine fleet as a replacement for the aging and obsolescent AN/WPN-3. In this application, it is required to have better performance and higher reliability than any existing Loran receiver. The BRN-5 is actually only a sensor, in that the data processing, filtering and logic functions are performed in the CP-89O/UYK Central Navigation Computer. The hardware and software requirements are set by the performance ,required, which specifies search and settle times, track accuracy in noise and both synchronous and non-synchronous interferences, skywave rejection and a variety of other requirements. In addition, it is required to have an automatic overall self test capability, automatic fault isolation and a manual diagnostic mode. The system performance specification emphasizes reliability above all, not just hardware, but in the sense of accurate position information under the most severe sisal environment conditions. Because of the particularly stringent signal processing requirements, some techniques not generally employed in Loran receivers were utilized. This paper describes some of these techniques, along with parameter tradeoffs and unexpected phenomena uncovered in the course of system debug.