Drone anti-mute? Strengthening resilience?

Question

Quadcopter

There are many different types of drone stubs.
Interested in the following, what happens to the drone when it is jammed? Does he fall? Or is control lost but left hanging in the air?
Well, the most important question is how to improve the stability of the drone in case of a stub? At least bring him home.

Answer 1

Or losing control

This.
And it crashes or freezes - depends on the settings. Some drones require a constant connection to fly (they will fall), some do not (they will hang), some provide for the possibility of a permanent disconnection and behave according to a predetermined plan (slowly descend or arrive at a certain point).
And the devil knows. Change frequencies, for example, the remote control, but they still work in a certain range, which cannot be just taken and changed.

Answer 2

Look at Big Brothers.
Measures against jammers are as follows
* Switch to inertial guidance system
* Compare GPS differential signals and switch to inertial system in case of strong divergence
* Directional GPS antennas
* Terrain
guidance * Laser beam guidance
* Encryption of the communication channel
However, I think for such a smart drone, concern Kalashnikov has already prepared something like a mini MANPADS or an assault rifle with a millimeter-wave radar.

Answer 3

In this answer, information regarding the most common copters - from the manufacturer DJI
There are two main threats:
1 - air noise
a) communication with the remote control is
lost b) GPS is lost, positioning by drone sensors 2 - GPS
coordinates spoofing
In case of noise, the following will help:
and a copter,
the standard solution on the territory of this country is the software inclusion of more powerful "FCC" and "Boost" modes
- frequency shift
for some models is possible, again, by software, a small frequency shift - instead of 2.4, you can turn on 2.3 or 2.5
- directional antennas , amplifiers, etc.
hardware that improves communication between the remote control and the quadcopter
Nothing will help much from the loss of the GPS signal, but if the connection with the remote control is maintained and the pilot has the skills to control the copter in the "Atti" and "Vision" modes, the ability to return and land the copter safely will remain
. are specially shifted to one of the zones specified in the copter firmware by the manufacturer as forbidden = "NFZ", in connection with which, the DJI drone begins to descend, beyond the control of the pilot, even if there is a connection with the drone.
This situation can be avoided by "removing" the NFZ zones from the copter's brain. At the same time, in a situation of coordinate substitution, the copter will be poorly positioned, because regardless of its real position, it will see the same replaced coordinate. But, again, if there is a connection with the remote control and the skills of the pilot, it will be possible to safely take the copter out and land the opportunity.