1
\$\begingroup\$

I'm trying to set up a U-blox 6 GPS module with an Arduino.

In order to save power I have tried to reconfigure it using the U center to search for a fix only once every 5 minutes. I have read the instructions however probably I don't understand them correctly as the GPS still seems to give a reading for latitude and longitude once every second. I would like to know why this is and what I am doing wrong if someone could tell me.

The settings I used are:

Update Period: 300
Search Period: 150
Grid Offset: 0
Acquisition Timeout: 60
On Time:2

While the GPS itself is actually stationary I get results that are changing slightly e.g. as follows from 10:41:24:

$GPGLL,4119.01373,S,17445.96088,E,104124.00,A,A*71 10:41:25         
$GPGLL,4119.01371,S,17445.96091,E,104125.00,A,A*7A 10:41:26 
$GPGLL,4119.01373,S,17445.96100,E,104126.00,A,A*72 10:41:27 
$GPGLL,4119.01371,S,17445.96102,E,104127.00,A,A*73 10:41:28 
$GPGLL,4119.01380,S,17445.96110,E,104128.00,A,A*71 10:41:29 
$GPGLL,4119.01380,S,17445.96112,E,104129.00,A,A*72 10:41:30 
$GPGLL,4119.01380,S,17445.96112,E,104130.00,A,A*7A 10:41:31 
$GPGLL,4119.01392,S,17445.96120,E,104131.00,A,A*79 10:41:32
\$\endgroup\$
4
  • \$\begingroup\$ Over that five minutes does the position change at all? It's been a while since I've used a U-Blox but I thought there were different parameters for how often the fix was calculated versus the output rate. \$\endgroup\$ – PeterJ Dec 31 '14 at 10:27
  • \$\begingroup\$ thanks, yes it does seem to be changing slightly e.g. as follows 10:41:24 $GPGLL,4119.01373,S,17445.96088,E,104124.00,A,A*71 10:41:25 $GPGLL,4119.01371,S,17445.96091,E,104125.00,A,A*7A 10:41:26 $GPGLL,4119.01373,S,17445.96100,E,104126.00,A,A*72 10:41:27 $GPGLL,4119.01371,S,17445.96102,E,104127.00,A,A*73 10:41:28 $GPGLL,4119.01380,S,17445.96110,E,104128.00,A,A*71 10:41:29 $GPGLL,4119.01380,S,17445.96112,E,104129.00,A,A*72 10:41:30 $GPGLL,4119.01380,S,17445.96112,E,104130.00,A,A*7A 10:41:31 $GPGLL,4119.01392,S,17445.96120,E,104131.00,A,A*79 10:41:32 \$\endgroup\$ – S.H. Dec 31 '14 at 10:43
  • \$\begingroup\$ the GPS itself is actually stationary \$\endgroup\$ – S.H. Dec 31 '14 at 10:50
  • \$\begingroup\$ I've just added the info from your comments to the question. I'm heading off soon but if you don't get an answer meanwhile I'll have a better look tomorrow, I think I've got some code somewhere that changes the update period and seem to remember there was some subtle trick. \$\endgroup\$ – PeterJ Dec 31 '14 at 10:58
1
\$\begingroup\$

I think I've found the problem now...

In the U-blox center Configuration View I changed the settings in the section:

RXM (Receiver Manager) from 0-Continuous Mode to 1-Power Save mode.

Now it seems to be collecting points only once every 5 minutes as expected :)

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.