What if question about ASW?

[geetrue]

What if the US Navy (I hope just our Navy) put up an array of directional hydrophones in the Persian Gulf straits or the Gulf of Mexico
and then posistioned an earth weather/cia satellite to cordinate sounds with what the satellite see's?

If the sounds are there and the satellite doesn't see anything wouldn't that indicate a submarine is attempting to enter or exit the area?

I know a little bit about this stealth stuff, but it was so long ago ... I have to remain silent.

Anyone else have any ASW idea's?

[Cybermat47]

Nice idea
You'd have to get the permission of whoever owns that area though.

[Platapus]

Would be an interesting way to counter the narco spss threat.

Would not take a lot of sensors either

[magicstix]

The problem with trying to correlate acoustic data with satellites is that recon satellites have very small windows in time and space for being able to cover a given area. It's a pretty big ocean in most places, so this wouldn't work too well.

On the other hand, you don't really *need* to correlate with a satellite, since if you have a bunch of phones out somewhere, you can classify by the acoustic signature and tell if it's a sub that way.

[geetrue]

What if the Navy used a spy drone instead of a satellite ...
can they see at night if any ships are going through the target surveyed area?

http://globalnation.inquirer.net/607...illance-report

Japan is considering introducing US spy drones to boost surveillance of its territorial waters near islands in the East China Sea at the center of a bitter dispute with Beijing, Kyodo News said Monday.

The Japanese defense ministry hopes to introduce the unmanned Global Hawk aircraft by 2015 “in a bid to counter China’s growing assertiveness at sea, especially when it comes to the Senkaku Islands,” the news agency said, citing unnamed government officials.

Beijing has been sending maritime patrol vessels into waters around the Japanese-controlled islands, which China claims as Diaoyu, since Tokyo nationalized the chain in September.

China is apparently seeking to prove that it can come and go in the area at will.

What if you used a floating passive sonar platform anchored like they did the USS Ponce?

http://www.foxnews.com/us/2012/09/23...rkout-in-gulf/

A new, key addition to American-led naval efforts to ensure Mideast oil keeps flowing has emerged as an unusual mix of a ship combining decades' worth of wear and tear with state-of-the-art technology and a largely civilian crew.

After winning a reprieve from the scrapyard, the USS Ponce was reborn through a rush retrofit earlier this year and turned into a floating base prowling the waters of the Persian Gulf.

It is now getting its biggest workout since refurbishment as the centerpiece for sweeping anti-mine naval exercises under way that serve as a very public warning to Iran.

The Islamic Republic has threatened to shut the Gulf's entrance at the Strait of Hormuz, the route for a fifth of the world's oil supplies, and would likely use mines to do so.

My main concern are diesel electric submarines going unoticed more than say a nuclear submarine that have very different signatures.

[magicstix]

Originally Posted by geetrue

My main concern are diesel electric submarines going unoticed more than say a nuclear submarine that have very different signatures.

Diesels go unnoticed because they're quiet, in which case it wouldn't matter if you had a drone flying over since you wouldn't have the acoustic signature to correlate against. If you could pick up the acoustics, you wouldn't need the drone.