HedgeTrimmer
Captain
United States
Offline
|
hallmark007 Posted at 2018-4-14 12:34
A drone needs minimum 6 satellites for stable flight, so yes strictly if you go by the number of satellites shown aircraft at 12 would show a minimum number to be 7, you must remember that dji drones read both glonass and gps you need a minimum number 6 sats of one type.
If you are flying in between high rise buildings you maybe showing 12 but if these satellites are to close together and not providing good gps it will be noted on your bar graph this is where you should be reading you proper gps signal, those number of satellites are not a true reflection of the strength of your signal, you really need at least 4 lights lit on your bar graph for good stability.
To many people fooled by the numbers and not checking the bar graph.
you must remember that dji drones read both glonass and gps you need a minimum number 6 sats of one type
Is that a DJI drone restriction in their implementation, requirement of 6 satellites of same type to establish 3D fix?
According to electrical engineers discussing Satellite Positioning systems. A system needs minimum of two of a type (GLONASS, GPS, Galileo, Beidou).
For a single GPS case you need 4 Satellites for the components [X,Y,Z, dt (the estimated receiver clock error)]. For each new systems you have to add one bias term, describing the difference between the transmitted time scales (since every system has it's own specific time scale) for each system relative to one time scale
Leaving it to where you would only need 5 satellites if there were only two types. Three GPS + Two GLONASS or Two GPS + Three GLONASS. Rather than normal required 4 Sats of same type to get a 3D Lock (X, Y, Z, dt).
|
|