Update of /cvsroot/firebug/firebug/web
In directory sc8-pr-cvs1:/tmp/cvs-serv18140
Modified Files:
gps_tests.htm index_old.html
Added Files:
gps_coldstart_data.htm
Log Message:
reorganized gps pages
--- NEW FILE: gps_coldstart_data.htm ---
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=windows-1252" http-equiv=Content-Type></HEAD>
<BODY><XMP>%%%%%%%%%%%%%%%
%%% Purpose %%%
%%%%%%%%%%%%%%%
Determine cold-start acquistion time for Leadtek GPS receiver in a suburban environment.
%%%%%%%%%%%%
%%% Data %%%
%%%%%%%%%%%%
Roof of Bechtel
Time | Location | Cold Start | # of Sat.
--------------------------------------------------
8:45 Chessboard 40 sec. 3
8:50 " 55 3
8:53 " 46 3
8:55 " >2 min -
8:59 " 53 3
9:00 " 52 3
9:04 Next to Pines 1:15 3
9:06 " 1:24 3
9:08 " 1:09 4
9:12 " 51 3
9:13 " 36 4
9:14 " 52 3
9:15 " 51 3
9:18 Next to Davis 1:45 3
8:21 " >2 min -
9:27 Under Trees 47 5
9:29 " 20 3
9:30 " 51 4
9:31 " >2 min -
9:34 " 42 5
9:35 " >2 min -
9:38 " >2 min -
Roof of Main Stacks
Time | Location | Cold Start | # of Sat.
--------------------------------------------------
9:45 Main Stacks 48 5
9:47 " 41 5
9:48 " 51 5
9:49 " >2 min -
9:51 " >2 min -
9:53 " 48 5
9:54 " 39 5
mean = 52.54
median = 51
st. dev. = 17.28
%%%%%%%%%%%%%%%%%%
%%% Discussion %%%
%%%%%%%%%%%%%%%%%%
- Cold-start acquisition time seems to be unrelated to the # of satellites in line of sight.
- Geographical data more accurate with four or more satellites
- As observed at 'Main Stacks' and 'Under Trees', GPS occasionally fails even if an adequate number of satellites is know to be in line of sight
- Small tree canopies, like those at 'Under Trees' do not block GPS signals
- Acquisition times might be reduced by setting the receiver's sampling rate rather than power cycling it from the host (mote). To test this, though, it will be necessary to send commands to the receiver.
</XMP></BODY></HTML>
Index: gps_tests.htm
===================================================================
RCS file: /cvsroot/firebug/firebug/web/gps_tests.htm,v
retrieving revision 1.1
retrieving revision 1.2
diff -C2 -d -r1.1 -r1.2
*** gps_tests.htm 28 Jul 2003 16:47:45 -0000 1.1
--- gps_tests.htm 1 Aug 2003 16:34:06 -0000 1.2
***************
*** 67,71 ****
<p>
! For raw data, click <a href="cold_start.htm">here</a>. The average
cold-start time from 22 samples taken in various locations was between
51 and 52 seconds. Moreover, the following observations were made:
--- 67,71 ----
<p>
! For raw data, click <a href="gps_coldstart_data.htm">here</a>. The average
cold-start time from 22 samples taken in various locations was between
51 and 52 seconds. Moreover, the following observations were made:
Index: index_old.html
===================================================================
RCS file: /cvsroot/firebug/firebug/web/index_old.html,v
retrieving revision 1.2
retrieving revision 1.3
diff -C2 -d -r1.2 -r1.3
*** index_old.html 24 Jun 2003 00:07:20 -0000 1.2
--- index_old.html 1 Aug 2003 16:34:06 -0000 1.3
***************
*** 76,80 ****
<p>
GPS capabilities are explained <a href=
! "gps_driver.html">here</a>.
</p>
--- 76,80 ----
<p>
GPS capabilities are explained <a href=
! "gps.html">here</a>.
</p>
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