Two TA = No bearing ambiguity

[Deathblow]

Originally Posted by LuftWolf

I don't think the 688/688i carry enough processing power to perform the necessary calculations... considering the SW was built without utiziling COTS from scratch (the TB-29 currently on the 21/22 are of the legacy variety as far as I can tell), I'd say it's the same for the 21/22 (JC probably has more significant COTS implementation so may already be utilizing the TB-29A, the COTS variety of TB-29).

So, the issue of twin-TA utlization is more an issue of computing power than physics for US subs currently... so the ambiguity stays for US subs. Nice try though.

COTS can handle it! The programs needed to continously update the old 688i software has been in place since 1997. The 688 software systems have been undergoing continuous upgrades for the last 9 years. The SW was designed with open-enough architecture to be amendable to rapid software/systems upgrades.

http://www.fas.org/man/dod-101/sys/ship/ssn-688.htm

A-RCI is a four phased transformation of existing sonar systems (AN/BSY-1, AN/BQQ-5, or AN/BQQ-6) to a more capable and flexible COTS/OSA-based system. It also will provide the submarine force with a common sonar system. The process is designed to minimize the impact of fire-control and sonar system upgrades on a ship's operational schedule, and will be accomplished without the need for major shipyard availabilities. Phase I, which commenced in November 1997, will enhance towed-array processing. Phase II will provide additional towed- and hull-array software upgrades. Phase III will upgrade the spherical array, and Phase IV will upgrade the high-frequency sonar system on SSN 688I-class submarines. Each phase will install improved processing and control and display workstations. The current installation plan completes all SSNs through Phase III by FY03.

Processing power not a prob. Bearing ambguity.... going down!