Subject: [IGSMAIL-255] Rogue Firmware Upgrade V7.4
From: J. Lindqwister
Date: 14 MAY 1993 08:43:44

IGS Electronic Mail       14-MAY-1993 08:43:44       Message Number 255
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From:  J. Lindqwister
Subj:  Rogue Firmware Upgrade V7.4
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A new bug has been discovered in the Rogue software affecting the
observables when AS is turned on. There are newly discovered biases in the C/A
psudorange as follows:

Bias [m]			Satellite
--------                -----------------------------
- 1.0			1,2,3,4,5,6,9,10,11,12,13,14,16,18,19,20
			23,25,26,27,28,29,30,31,32

+ 30.0			7, 15, 17, 21, 24

- 30.0			8, 22

These biases are unfortunately not perfectly predictable, since they
vary with time, hence the only solution is to correct the software
for them (rather than to adjust observables in post-processing).

This problem has been corrected such that the biases are brought down
to the 2 nanosecond level (~60 cm). This new Rogue software version
will be called V7.4. The release schedule is as follows:

Date		Action
--------- 	----------------------------
May 11, 93	Beta Test Version installed at JPL Mesa, CA
May 14, 93	Beta Test Version installed at Vandenburg, CA
Jun 01, 93	Test Version installed at Kokee, Usuda, Santiago
		and Faibanks
Jul 30, 93	Ugrades for rest of Rogues and MiniRogues in the
		GPS Global Network (~30 Rogue's worldwide)

- Ulf

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Ulf J. Lindqwister                 Telephone:   (818) 354 1734
GPS Networks & Operations Group    FAX:         (818) 393 4965
Jet Propulsion Laboratory          Email:       [email-masked]
4800 Oak Grove Dr.
Pasadena, CA 91109
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