Re: How does TCAS get range and bearing?

In article <DfKdnRn-_pQbQtjVnZ2dnUVZ_oninZ2d@[EMAIL PROTECTED]
>,
 "RST Engineering" <jim@[EMAIL PROTECTED]
> wrote:

> Bob ...
> 
> I think you are a little bit off the mark.  TCAS sends, in one form or 
> another, my lat/long/altitude out either as a radar blip to an
interrogation 
> or from GPS coordinates.  If you know your own l/l/a and you get another

> l/l/a and the l/l/a of the interrogator, just a wee bit of geometry and 
> software can give you target info accurate to a degree and a few feet of

> altitudinous.

um, no.  ADS-B OUT sends out lat/long/altitude.  TCAS does not
send/receive 
that info.

ADS-B would be so much better than TCAS for SA, but one thing that has to
be addressed is the validation of the information (there is nothing
preventing
spoofing ADS-B out information).

-- 
Bob Noel
(goodness, please trim replies!!!)