4 sats good? …hardly.
There are many reason why you get “Unhealthy GPS Signal” messages.
Some more info:https://ardupilot.org/copter/docs/common-gps-how-it-works.html?highlight=unhealthy+gps
https://ardupilot.org/copter/docs/gps-failsafe-glitch-protection.html?highlight=unhealthy+gps
Here is some more practical testing in regards to shielding
I had a few GPS related crashes over the years and since I had some time I’ve decided to test reception using an old Ublox6 I’ve got sitting around and Ublox u-center software. The testing was done outdoors at the exact same spot. At least one minute waiting time was provided in each setup in order to settle the signal and get true readings.
The purpose is to answer some questions in regards to shielding which apparently helps reception by reducing RF interference and signal deflection.
For th…
Some practical comparison of receivers:
Hello, I know this discussion is two years old but my comments might benefit some users. This test setup is not valid as the antennas are very close to each other (under 20cm which is a wavelenght at GPS L1). This means that they will couple to each other and affect their radiation patterns. Ideally, you need more space between the antennas (40 cm ++). Also the patch antennas need to be used with a 10 cm (diameter) ground plane directly under them. This is the only way to get the best performanc…