Currently, in large cities, there is a steady tendency to increase the spatial density of telecommunication systems.
The saturation of the radio spectrum with analog and digital systems used to solve the problems of radio communication
and television allows to improve the technologies of semi-active radar detection and determination of the coordinates of
a low-altitude object on their basis.
Conducting radar surveillance using non-radar radar transmitters is often called semi-active radar using
extraneous or parasitic radiation sources. The advantages of such systems are the minimization of deployment costs, low
operating energy costs, low probability of malfunctioning, stealth of the fact of operation, environmental friendliness,
and the absence of requirements for the allocation of radio frequency resources. Relatively high heights of antennas of
communications and television transmitters with the existing radiated power create favorable conditions for detecting
low-altitude objects. Digital signals of modern telecommunication systems have a spectrum width that provides
acceptable resolution and accuracy of measuring the total distance and angular coordinates [20; 21]. In the general
case, systems of this type are a multi-position system consisting of one or more radiation sources and one or more
receiving positions spread in space [22; 23].
The paper gives a general description of the proposed method of determining the coordinates of an aerial object
at low altitude under the conditions of propagation of several beams of radio signals. The method and its technical solution capable of determining the coordinates of an unauthorized low-altitude object under the conditions of the
existence of several rays of radio signal propagation are defined, and the algorithm of its operation necessary for the
technical implementation of the proposed method is presented.
The paper considers options for determining the coordinates of aerial objects with different composition of
primary coordinate measurements and the number of receiving points. The accuracy of determining the location of the
object for multi-position radio systems of this type was evaluated under the conditions of the existence of several beams
of radio signal propagation in the developed model, taking into account the number of received signals and their
measurement errors.
