BEARING MEASUREMENT METHOD AND APPARATUS THEREFOR Russian patent published in 2015 - IPC G01S3/02 

FIELD: radio engineering, communication.

SUBSTANCE: group of inventions relates to radio direction-finding and can be used to determine the bearing of radio-frequency sources of composite signals in conditions where the antenna is tilted relative to the bearing plane. The result is achieved due to that the inventions are based on the use of a differential-phase method. Said result is achieved due to that a bearing is formed from the phase (α) of a modulating wave. The pitch (θ) and roll (γ) values of the aircraft are used to generate the tilt parameter of the antenna of a radio direction-finder [cos(γ)] relative to the bearing plane and the angle (φ) of the direction of the minor axis of an ellipse, its projection on the bearing plane relative to the heading of the aircraft, which is subtracted from the phase value. The resultant difference is used to generate values of a cosine function {cos(α-φ)} and a sine function {sin(α-φ)}; the sine function is then multiplied by the tilt parameter {cos(γ)·sin(α-φ)}, after which a double arctangent function is calculated. The value of the function is summed with the previously subtracted angular value of the direction of the minor axis of the ellipse (φ) relative to the heading in the bearing plane {atan2[cos(α-φ), cos(γ)·sin(α-φ)]+φ}, wherein the summation result is the desired bearing. A radio direction-finder which realises the method includes an antenna consisting of N dipoles arranged on a circle, a switch, two receivers, a π/2 phase changer, an antenna tilt compensator and a spatial orientation coordinate converter, connected to each other in a certain manner.

EFFECT: high accuracy bearing measurement.

2 cl, 5 dwg