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- Newsgroups: sci.space
- Path: sparky!uunet!utcsri!utzoo!henry
- From: henry@zoo.toronto.edu (Henry Spencer)
- Subject: Re: GPS for satellite positioning
- Message-ID: <BrwJK3.5Lq@zoo.toronto.edu>
- Date: Fri, 24 Jul 1992 16:38:26 GMT
- References: <9207221207.AA29101@cmr.ncsl.nist.gov> <1992Jul24.022700.4040@ke4zv.uucp> <1992Jul24.053343.12852@news.iastate.edu>
- Organization: U of Toronto Zoology
- Lines: 31
-
- In article <1992Jul24.053343.12852@news.iastate.edu> cfrandal@iastate.edu (Charles F Randall) writes:
- >I've been told that there are _no_ satellites that use GPS for their
- >positioning data. I find this hard to believe. I've seen
- >advertisements for the Monarch GPS receivers in 'Space News'.
-
- Bear in mind that satellites have long lead times and in recent years have
- tended toward very conservative design. The idea makes sense, it's just
- that nobody has tried it in space yet. I have a dim recollection that
- there are plans for trials soon.
-
- Bear in mind, also, that operational use is still hampered by the rather
- incomplete satellite constellation. There are times and places in which
- there aren't enough satellites visible for effective use.
-
- >It is my understanding that the current level of GPS is only capable
- >of providing lat. and long. information and in the future, they plan
- >to incorporate elevation. Is this correct?
-
- No. The GPS signals provide full three-dimensional positioning, given
- that your receiver is sufficiently intelligent and that enough satellites
- are in view.
-
- >Finally, does anyone know if crew members of the Shuttle have taken up
- >a hand held GPS unit?
-
- I haven't heard of it. Bear in mind that a lot of the handhelds are
- deliberately limited in the speed and altitude they can handle, to ensure
- that they are not useful for missile guidance.
- --
- There is nothing wrong with making | Henry Spencer @ U of Toronto Zoology
- mistakes, but... make *new* ones. -D.Sim| henry@zoo.toronto.edu utzoo!henry
-