# Monitoring of drone jammer avoidance places

In order to shield the signal, the interference source transmits radio frequency power (CW + modulation) at the same frequency as the enemy link or network. The enemy’s receiver (“listening” part) will receive both the drone jammer transmission and the “buddy” transmission. If the drone interferes with the power of the “partner”, the “receiver” will not be able to “understand” the message/data correctly. Or, if the power of the “partner” is greater than the power of the interferer, the “listener” may be able to correctly “understand” the message/data, and the communication link between the “partners” will remain uninterrupted.

Sometimes, the interference signal arriving at the input of the receiver may be lower than the communication signal (“partner”), but still dominate. This happens because the receiver usually needs a certain “margin” between the two signals at its input in order to be able to interpret one (usually the loudest). However, in advanced communication systems, this “margin” may sometimes even be negative (which means that the communication signal may be much weaker than the interference signal), and the receiver can still interpret the “partner” signal, thereby changing the interference. It’s more difficult.

Usually in anti-drone applications, the goal is to block the drone at a distance of hundreds of meters from sensitive areas/equipment (where the signal protective cover is installed). For example, we want a drone that is 300 meters away from the signal jammer and flies at an altitude of 10 meters. It can be understood that in this case, the diagonal distance between the signal shield and the drone is approximately the same as the horizontal distance between them. So, for the sake of simplicity, we will discuss the horizontal distance, and we won’t mind when calculating the exact distance because the difference is very small.

Although this equation is the simplest form (no cable loss, SNR, etc.), it can be used to calculate any interference scenario/budget. As you can see, it consists of two dimensions/links (Jammer <-> Drone and Operator <-> Drone), not just one dimension/link, just like a communication link. In other words, for each specific condition of the carrier link <-> UAV (specific output power, antenna gain and height, distance, etc.), the interference link <-> UAV has specific conditions/conditions in order to Stop it…that’s why you answered “What is the range of your drone jammer?”. This problem is not an easy task.