METHOD FOR DETERMINING THE LOCATION AND FLIGHT VELOCITY OF AN AIRCRAFT Russian patent published in 2022 - IPC G01S1/16 G01S13/87 G01C23/00 

FIELD: navigation.

SUBSTANCE: invention relates to methods for determining the navigation parameters of an aircraft (LA) - its location and flight velocity vector - when combining goniometric systems and ranging systems, and can be used as part of local navigation systems based on passive location. According to the proposed method, signals are formed and emitted using radio beacons with known coordinates. These signals for the synthesis time interval are received using the antenna-receiving module of the passive locator installed on the aircraft. According to the received signals, a trajectory signal vector is formed, characterized by complex envelopes of the received signals, a set of trajectory reference vectors is formed corresponding to the expected signal vector in the absence of noise and interference up to unknown desired parameters that determine the location and velocity vector of the aircraft. Next, the values ​​of the decision function characterizing the difference of each reference vector from the signal vector are determined, and the location and the aircraft flight speed vector are estimated by choosing the parameters of the reference vector for which the specified difference is minimal. Additionally, the distance between each radio beacon and the aircraft is determined at the beginning of the synthesis time interval and at the same time the value of the possible error of this measurement is estimated, and the distance from its starting point for the synthesis time interval to each radio beacon with known coordinates is determined for each reference vector. In this case, the determination of the value of the decisive function and the search for a reference vector that is minimally different from the signal vector is carried out only for those reference vectors for which the difference between the distance from each beacon to the aircraft and the distance from the starting point of the reference vector for the synthesis time interval to each radio beacon is less than distance measurement errors from each beacon to the aircraft.

EFFECT: increasing the accuracy of estimating the location of the aircraft and its flight speed vector while reducing the computational costs for these estimates.

3 cl, 1 dwg