I’ve read the threads, but am under a tight schedule and don’t have time to attempt to debug GPS parsing problems. In the meantime, I get periodic aberrant GPS Lat & Lon, so my algorithm just filters out anything that suddenly sends me to Gilroy or Beijing.

When I walk around neighborhood, or driver around town or Hwy, it tracks perfectly, except when it is back on my desk just sitting there; then Lat or Lon sometimes fluctuate ~150 feet.

@douglaskbell , are those active external antennas? When you walk around, they are powered by battery. However when you get home, do you plug a USB power supply to them right away? Have you looked at the lat/lon data when you are home and battery (only) powered?

[image] douglaskbell: when it is back on my desk just sitting there; then Lat or Lon sometimes fluctuate ~150 feet. That's no surprise. These GPS satellites do transmit with rather low power and inside buildings satellite "visibility" is severely degraded.

That sounds about right. The GPS needs to “see” the satellites in order to work and four satellites is the minimum number for a valid fix, but when it “sees” more satellites it can improve the potential error in the fix by combining all the data. So going outside should improve your fix and going i…

peekay123: I don’t know. Yes, I usually plug into USB when I get home. No. So, you suspect the GSP inaccuracy when it’s on USB power? I will check into this.

BATTERY STATUS QUESTION: How do I get battery status (v and %)? Does TinyGPS have this? Or, can I have both libraries loaded in my app (ASSET TRACKER 0.0.3 to get ‘fuel’ class, and ASSET TRACKER RK 0.0.1 to get TinyGPS). …UPDATE: Ah, hah! I just spied batteryStatus() within ASSET TRACKER RK 0.…

[image] douglaskbell: How do I get battery status (v and %)? Look here https://docs.particle.io/reference/firmware/electron/#fuelgauge It's not part of the Asset Tracker but the Electron.

peekay123: My ASSET TRACKER 0.0.3 based electron firmware still drifts by Lat 112’ and Lon 158’ when indoors on battery power only. I am presently implementing ASSET TRACKER RK 0.0.1

[image] douglaskbell: My ASSET TRACKER 0.0.3 based electron firmware still drifts by Lat 112' and Lon 158' when indoors Did any of that reasoning "against" indoors use reach you at all? @bko has given you a rather well founded background in the topic. And I just stated the short version …

@douglaskbell , then that confirms what @bko said. Clean power is always important but in this case, is not the problem.

Is there a debugged asset tracker GPS library yet?

Troubleshooting

Mattster December 9, 2016, 5:13pm 23

It is unreasonable to expect a GPS to work indoors

[SOLVED] TinyGPS++ with Asset Tracker

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Is there a debugged asset tracker GPS library yet?

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