We have satellites that don’t have fixed orbits. But there is that minor problem there.
Drones have a very tiny RCS, cause they’re tiny.
They don’t have “fixed” orbits because they have fuel to adjust orbits. Only just so much fuel, so their delta-vee is limited. Such an orbital change also has to be done in advance. It can’t be an abrupt change, again a finite amount of delta-vee is carried.
Any adversary with sufficient National Technical Means would be tracking the satellite and notice the orbital change.