METHOD FOR HIDDEN RADIO ENGINEERING NAVIGATION Russian patent published in 2022 - IPC G01C21/20 G01S1/08 G01S13/34 

FIELD: radio engineering.

SUBSTANCE: invention relates to the field of radio engineering and can be used to determine the location of objects such as unmanned aerial vehicles and other robotic systems. In the claimed method for radio engineering navigation of objects, synchronous emission of signals by the ground group of radio beacons, reception of signals by the navigation object and use of the difference in the propagation times of radio waves proportional to the corresponding differences in distances from the radio beacons to the navigation object as a navigation parameter are carried out. Lines of position of the object on the plane are constructed in the form of hyperbolas and surfaces of position in space in the form of hyperboloids of revolution and the position of the navigation object is found at the point of intersection of two hyperbolas on the plane or three hyperboloids of revolution in space. Radio beacons radiate linear-frequency-modulated signals with the same rate of change of the intra-pulse frequency, the initial frequencies of which are individual for each radio beacon and differ by specified values. The sum of the signals is received by the autocorrelation receiver of the navigation object, filtered, delayed by a specified time, multiplied by its own delayed copies, and the difference frequency component of the sum of the signals is isolated. By the maximum value of its amplitude-frequency spectrum (AFS), the presence of navigation signals is determined, the components of the sum of signals at mutual-difference frequencies are distinguished, by the values ​​of the difference between the ASF components at mutual-difference frequencies at the current reception and calculated during their simultaneous reception, the differences in the propagation times of radio beacon signals to the navigation object are determined, which are proportional to the respective distance differences.

EFFECT: increasing the radio-technical secrecy of the system.

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