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Improve the GPS reliability
Build a helix antenna
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Results
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Neo6: patch - Helix antennaOn the images |
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bellow you can see |
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two GPS traces, first image is |
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obtained running the helix antenna with +/- 3m error |
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. The image on the right |
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show the original patch |
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result with more than 20 meters errors |
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/jumps. If you are really looking for a very high reliability |
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i would recommend to use a NEO-6 GPS module instead of the now popular M8N, this old NEO-6 device is less subject to position glitches. (see next example) If you want to use a magnetometer you can use a separate HMC5883l module. |
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I am not detailing the antenna construction because it has already been done in a lot of pages, I used this one as a guide : http://lea.hamradio.si/~s53mv/navsats/analog.html
In this case I had to add a 18pF capacitor because the original patch antenna has a built in preamplifier that is powered with 3.3V. To avoid a short circuit with the new antenna this capacitor is required, the exact value is not critical, just select one from 10pF to 47pF.
I also did the same modification with a M8N module that has a built in magnetometer. This module is able to catch more constellations but is more subject to jumping errors than the old NEO-6, so use it only if you want a compact design with an embedded magnetometer.
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Neo8m: Patch - Helix antenna
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In this test two GPS modules are used at same time, the left GPS trace show the original GPS Neo8m module and to the right trace another same module running helix antenna with SMA connector.
You can notice the North-East spike, those spikes or quick jumps can occurs as well using a helix antenna. The position change jump quickly 10m or more and return slowly to original position. This jumps issue looks related to neo7/neo8 family and can occur using only GPS(USA) as well. |
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My flying test platform
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