Ublox GPS library not reporting number of satellites

iidioter / ardupilot-mega

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Ublox GPS library not reporting number of satellites #142

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago

What steps will reproduce the problem?
1. Run debug test for gps
2.
3.

What is the expected output? What do you see instead?
Number of satellites always reported as zero

What version of the product are you using? On what operating system?

Please provide any additional information below.

Original issue reported on code.google.com by dewei...@gmail.com on 27 Sep 2010 at 6:30

GoogleCodeExporter commented 9 years ago

The APM_GPS_UBLOX library files include the ability to parse a NAV-SOL message 
to get the number of satellites used in a solution, but I haven't observed a 
number of satellites reported other than 0 for the Ublox module so I assume the 
module doesn't send this message by default.

To get a true number of satellites in view, APM_GPS_UBLOX has to recognize a 
RXM-SVSI message (page 82 in the data sheet), which is variable length, so the 
code will have to be changed to deal with variable-length packets (perhaps set 
_expect to 0 when size-checking should be bypassed).  It will probably also 
have to send a CFG-MSG command on initialization to enable RXM-SVSI messages 
(page 100 in the data sheet).

Original comment by bjpcalt...@gmail.com on 28 Sep 2010 at 12:00

GoogleCodeExporter commented 9 years ago

NAV-SOL needs to be enabled by the uCenter software to get sats information. 

Byte Offset: 47 U1  -   numSV   -   Number of SVs used in Nav Solution

This will get the info we need. Can you load uCeter and test it. We also need 
to look at the raw output to test the parser does not have an error.
Jason

Original comment by jasonshort on 28 Sep 2010 at 5:37

GoogleCodeExporter commented 9 years ago

Original comment by jasonshort on 28 Sep 2010 at 10:48

Added labels: Milestone-Later, Priority-Low
Removed labels: Milestone-Beta, Priority-Medium

GoogleCodeExporter commented 9 years ago

I disabled the NAV-STATUS message and enabled the NAV-SOL. After that the 
number of sats is shown correct in APM. Attached my config file for the ublox 
which can be used by uploading it to the gps with the uCenter software. 

Mirko

Original comment by mir...@googlemail.com on 5 Dec 2010 at 2:30

Attachments:

ublox5_helix_602_navsol.txt

GoogleCodeExporter commented 9 years ago

[deleted comment]

GoogleCodeExporter commented 9 years ago

I will be adding an update to CLI test mode for raw gps, that will allow 
bidirectional access of ucenter to the ublox. This change verified the ublox 
config that allows more messages through.
My current config is NMEA disabled entirely, and the following UBX messages 
enabled.
DOP
POSLLH
SOL
STATUS
SVINFO
VELNED

Original comment by Draconis...@gmail.com on 24 Feb 2011 at 2:27

Changed state: Started

GoogleCodeExporter commented 9 years ago

this has been fixed in master, with NAV_SOL automatically enabled on startup

Original comment by tridg...@gmail.com on 19 Jul 2012 at 5:23

GoogleCodeExporter commented 9 years ago

Original comment by tridg...@gmail.com on 19 Jul 2012 at 5:24

Changed state: Fixed