*** GPS World ***
			       1995

Sun Jan 22 16:11:06 1995
Message : #21142933    From: Terri Watson
Address : terri-watson@nols.edu
Group   : Usenet.rec.backcountry
Length  : 347 words
Subject : Tech-weenine GPS info source

Org.  : National Outdoor Leadership School


GPS World has published an in depth 1995 GPS Receiver Survey in its
January 1995 edition.
This pub is aimed at people using GPS in technical research or other
pretty technical manner, but it's focus is simply, "News and
Application of the GPS."  Article topics are varied, but if you are
looking for all kinds of info on all the systems available, this is an
excellent listing.  Very technical in nature, but addresses some of the
GPS questions posed in this group (like Temp. range for operation).
Source listed at end of post

Info includes by manufacturere and model (54 manufacturers, 275
receivers):
-Intro date
-Channels/tracking mode
-signal that it tracks
-max # satellites tracked
-Use (land/marine/aviation/space
-Applications
(military,navigation,surveying&GIS,Timing&frequency,vehicle &
vesseltracking, other position location, other)
-Size (WxHxD in inches, to nearest 10th of inch)
-Weight to tenth of lb.
-Accuracy (single/differential/post. diff) without selective
availability capabilities.  Accuracy is rated in terms of:  meters,
velocity (m/sec), time (ns), and update rate (sec).
-Time to first fix.  This rated in terms of warm start (has recent
almanac, current time, and initial position but no current ephemeris);
cold start (none of the previous known); reacquisition (when signal
lost for a minute).
-Number and types of computer interface ports
-baud rate of interface
-Temperatures that it is rated for, storage and operational, in C.
-Humidity ratings (noncondensing)
-Power consumption (watts)
-input voltage (Vdc)
-antenna type
-whether provisioned for an external antenna
-whether postproduction software is available for it
-warranty period
and finally
U.S. List price

Accompanying article in this issue:  "Innovation:  Understanding GPS
Receiver Terminology-A Tutorial"  This article assumes basic scientific
familiarity with GPS signals, etc., but it does address fascinating
details.

Single issue price is $12 (!)
Source:  GPS World;  PO Box 7677; Riverton, NJ  08077-7677
1-800-949-6525 9-5 EST


-
STANDARD DISCLAIMER!

Terri Watson
terri_watson@nols.edu
Lander, Wyoming
(Terri Watson)