From Miranda Wed Oct 5 06:25:37 1994 From: Miranda (Miranda) Date: Wed, 5 Oct 1994 6:25:37 PDT Subject: [IGSMAIL-0736] Report of a Turbo Rogue Receiver Problem Message-ID: ****************************************************************************** IGS Electronic Mail Wed Oct 5 6:25:37 PDT 1994 Message Number 0736 ****************************************************************************** Author: Miranda Chin/CIGNET Subject: Report of a Turbo Rogue Receiver Problem Subject: Report of a Turbo Rogue (TR) Receiver Problem Station: Richmond, FL Receiver Serial #: T308 Firmware Version: 2.8.32.1 Description ----------- Jan Kouba notified CIGNET that the pseudoranges went bad after he analyzed the data using the point positioning software, DCRAP. However, this problem could not be detected by using the pseudorange_phase combination. CIGNET re-examined the data and found the problem started on Sept. 11, around 03:00 UTC. Actions Taken ------------- Date /Time Description ---------------------- --------------------------------------------------------------------- Sept. 22, '94 Action by CIGNET: warmbooted the receiver by issuing a 'bang' command. Report by Jan: no change of the pseudorange data quality. Sept. 28, '94 Action: disabled/enabled all channels. Report: no improvement to the pseudoranges. Sept. 30, '94 Action: powered off the receiver; waited a few minutes before power it on again. Report: improved pseudoranges. Oct. 5, '94 Report: Jan re-confirmed that the data quality is excellent again by examining global solutions. Below are outputs from DCRAP. 'Table I' shows the error of computed point positioning is about 30 meters from Sept. 19's data; and, 'Table II' shows a normal offset from the initial position on Oct. 1's data. Table I. -------------------------------------------------------------------------------- Station: RICHMOND_RCM5 Date : 19/ 9/1994 ------------------------------------------------------------------------------- POSITIONING RESULTS - 2873 FIXES WITH GDOP < 10 X (m.) Y (m.) Z (m.) LATITUDE(dms) LONGITUDE(dms) HEIGHT(m.) ------------------------------------------------------------------------------- INITIAL 961336.000 -5674079.200 2740539.700 25 36 49.667 -80 23 2.137 -8.985 MEAN 961386.276 -5674064.347 2740518.245 25 36 49.126 -80 23 .272 -23.893 +/- 93.079+/- 209.780+/- 124.991 DIFFERENCE 50.276 14.853 -21.455 0 0 .541 0 0 1.866 -14.907 ------------------------------------------------------------------------------- RECEIVER CLOCK PARAMETERS FROM 2873 ESTIMATES TIME OFFSET S.D. OFFSET DRIFT S.D. DRIFT ------------------------------------------------------------------------------- RICHM 86400.0 877.9 m +/- 5.0 -90.5 m/day +/- 8.6 0: 0: .0 2928.5 nsec +/- 16.6 -301.7 nsec/day +/- 28.7 ------------------------------------------------------------------------------- Table II. ------------------------------------------------------------------------------- Differential Corrections to Range And Position (DCRAP- 25/03/93) ------------------------------------------------------------------------------- File : screen/rcm5.rnx Data Rate: 30 sec. Station: RICHMOND_RCM5 Date : 1/10/1994 ------------------------------------------------------------------------------- POSITIONING RESULTS - 2880 FIXES WITH GDOP < 10 X (m.) Y (m.) Z (m.) LATITUDE(dms) LONGITUDE(dms) HEIGHT(m.) ------------------------------------------------------------------------------- INITIAL 961336.000 -5674079.200 2740539.700 25 36 49.667 -80 23 2.137 -8.985 MEAN 961336.198 -5674079.590 2740541.834 25 36 49.723 -80 23 2.133 -7.687 +/- 18.270+/- 36.834+/- 20.656 DIFFERENCE .198 -.390 2.134 0 0 .057 0 0 .005 1.299 ------------------------------------------------------------------------------- RECEIVER CLOCK PARAMETERS FROM 2880 ESTIMATES TIME OFFSET S.D. OFFSET DRIFT S.D. DRIFT ------------------------------------------------------------------------------- RICHM 518400.0 -143.4 m +/- .9 12.7 m/day +/- 1.6 0: 0: .0 -478.4 nsec +/- 3.2 42.3 nsec/day +/- 5.5 ------------------------------------------------------------------------------- [Mailed From: Miranda Chin ]