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Unable to get GPS fix using HK ground station or GCS Mavlink

Posted by Nikos Gerarchakis on May 22, 2011 at 11:44am

Hey, i want to report a problem with the GCS. I have a APM with IMU and MediaTek? MT3329 . I cant get a GPS Lock.I upgrade the gps to latest firmware.From telemetry i read 8-10 satellites, but no GPS Lock. The leds were steady red and blue light.I disable (or enable in Mediatek v1.6) any heartbeat configuration but nothing. The same problem i found with APM Mission planner(latest version). I test with Qcontrol and GPS Lock looks fine.

Any help would be much appreciated.

Thank you in advance,

Nikos

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Replies

Nikos Gerarchakis May 26, 2011 at 1:15pm
Hi Happy K and Bertrant , today i decide to test old versions of HK GCS .

So after many test , finaly i setup the version 1.2.39. and observe the followings
1. When i start up with the auto mode enable , the GCS ( with 4 sats) display the cordinates .
2. When I switch to manual mode, and restart the program ( without to turn off the APM) the readings are normal.
3. The flight instruments has normal display.
Finally i test the Qground Control , with the same sequence ( auto and then manual mode) and the readings and GPS was Normal.

The battery for both tests was a 4.8 V Nimh fully charged.

I try again with latest version of HK GCS , but nothing happened

I want to use the Happy Ks GCS, because is light and simple to use

Any more help would be much appreciated.

hp_gcs_v1-2-39.jpg

qgroundcontrol.jpg
Nikos Gerarchakis May 24, 2011 at 1:40pm

Hi Bertrand , yes i use a 4.8V NiMh batt. What type of Lipo you use ? . I try with 800mAh 3S1P with UBEC @ 5Volt , but still nothing .

Happy K, i use the xbee@2.4Ghz.

So can i connect the UBEC @ 6volts ?
Paul Mather May 23, 2011 at 5:32am

Can you clarify if you're running APM or ACM2 firmware? The lock bit actually comes from the MediaTek as it's own parameter in the protocol. The last time I tested, it worked for me....so I'm wondering if there's possibly something wrong with your hardware? I don't know enough about how the GPS units work to say for sure....or if it's just a bit that gets set when satellites >=5 or something like that. I've been swamped with custom software for a customer and haven't had time to test.

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