On Thu, 12 Jun 2008 08:30:46 -0700 (PDT), deanwil@[EMAIL PROTECTED]
wrote:
>On Jun 3, 6:19 pm, "RST Engineering" <j...@[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.
>>
>> Jim
>>
>> --
>> "It is the mark of an educated mind to be able to entertain a thought
>> without accepting it."
>> --Aristotle
>>
>> "Bob Noel" <ihatessppa...@[EMAIL PROTECTED]
> wrote in message
>>
>> news:ihatessppaamm-D55A93.19444303062008@[EMAIL PROTECTED]
>>
>>
>>
>> > In article <1hdz3cp9zslvq.bd6inf8tkh7s....@[EMAIL PROTECTED]
>,
>> > Dallas <Cybnorm@[EMAIL PROTECTED]
> wrote:
>> > Well, it is a radar system. It determines RAnge and Direction the
same
>> > way
>> > the ATC Beacon Radars do. The TCAS II system sends out an
interrogation,
>> > times the response from the cooperating targets to get range. Crude
>> > direction
>> > information is determined by the 4-pole antennea. This azimuth
>> > information
>> > isn't particularly accurate (on the order of +/- 15 degrees)- Hide
quoted text -
>>
>> - Show quoted text -
>
>Bzzzzt.... nice try Jim, but thanks for playing! TCAS works exactly
>as Bob describes it. I worked at Boeing when TCAS was first
>implemented, and one of the LCD display projects I was working on was
>used as a retrofit TCAS/VSI.
Sounds like he's confusing ADS-B/Mode S extended squitter with TCAS.
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