sdr wrote:We have 4 stationary beacons mounted horizontally to a plate in a rectangular pattern about 0.3m off the ground. This arrangement is able to track the hedgehog when it is close to the stationary beacons but the tracking drops out at distances greater than 0.6m y or 1.0m x. Here are some dashboard screenshots:
All beacons are using v5.63 and everything is using default settings. Any suggestions for improving the tracking distance?
I see, at least, 2 potential points to check:
1) In your modem settings you have limitation of distance set to Auto. It means, that the system will choose how long to wait for the the ultrasonic signal to come automatically based on the maximum distances between stationary beacons. Since you have pretty unusual setup - very short distance between stationary beacons and tracking outside of the stationary beacons - most probably, you simply hit the Limitation of distance area. And the system doesn't wait for the ultrasonic signal anymore at all.
What you have to do - to switch to manual mode and choose the distance to track in meters.
2) I see that RSSI is pretty high - -27dBm. Maybe, you simply go too close to the modem, and mobile beacon is overloaded with the radio signal from the modem. Keep modem 1-2m from any beacon
Please, notice, that triangles in trilateration will be very narrow in your setup, and you shall expect quite drastic decrease in precision, when going farther from the stationary beacons.