Next message: Sellar, William E.: "RE: lv-ab: Dorade Boxes"
On Wed, 2003-01-22 at 19:34, steve weinstein wrote:
> Sounds suspiciously like the aircraft transponders that have been in
> widespread use for decades. The difference can't be that great and those
> units aren't that expensive.
>
> One thing though, wouldn't all the radar manufactures have to reprogram
> their units in order for them to interrogate the AIS signals?
>
> Steve Weinstein
An aircraft radar does not interrogate an aircraft transponder - it's a
different piece of hardware, which on some aircraft does display on the
radar scope, as it makes sense to correlate that data. But, most
civilian aircraft radar is optimized for the display of weather rather
than returns from aircraft.
However, a dedicated scope can be used for the display of transponder
returns - look for articles about TCAS on the web, such as the one at
http://www.caasd.org/proj/tcas/
AIS for ships would be similar to aircraft TCAS systems, except it'd
probably cost more - TCAS on aircraft can be as much as $100,000 per
unit - for a few reasons: it'd be mandated; it'd be new; and the marine
environment is probably tougher on electronics in general. There's an
article about AIS at http://www.gpc.se/aisusa/uscgais.htm . This link
says AIS should be $10,000-$20,000 per unit:
http://www.greatlakes-seaway.com/en/pdf/ais_faq_en.pdf
Billy
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