METHOD OF DETERMINING FLIGHT ALTITUDE OF LOW-ALTITUDE TARGET BY MONOPULSE TRACKING RADAR STATION IN REAL TIME Russian patent published in 2024 - IPC G01S13/44 

FIELD: radar.

SUBSTANCE: invention relates to radar and can be used in a low-altitude target (LAT) tracking radar station (RS) at low elevation angles in the presence of interfering reflections from the underlying surface. Method of determining flight altitude of LAT by monopulse RS tracking in real time is characterized by generation and emission of probing radar signals, receiving reflected echo signals from the LAT and from the underlying surface and processing them using the RS computer to determine the distance to the LAT, determination of its flight altitude and corresponding mutual geometrical arrangement of RS and LAT. RS uses antenna with 4 quadrants A, B, C, D of the web, implementing sum-difference processing by elevation angle and in inclined plane. Method is based on calculating the "antipode" angle, the phase difference between the forward signal and the "antipode" signal and the coefficient of reflection from the underlying surface as functions of one variable of the elevation angle. This makes it possible, when using LAT tracking data, coming from the RS receiving device at a given probing cycle, and values of parameters of the RS antenna system to calculate the values of the vectors of the forward signal and the "antipode" signal and determine the phase values of the vector of the summation channel and the phase of the vector of the elevation difference channel. During the one-dimensional search by elevation angle by comparing the calculated phase values with the reference signal phase value in the total channel and with the control value of the signal phase in the elevation difference channel, the LAT true elevation angle and its flight altitude are determined.

EFFECT: high accuracy of determining flight altitude of LAT while simplifying the design of the RS antenna system.

1 cl, 5 dwg