PASSIVE LOCATION SYSTEM FOR DETERMINING AIRCRAFT COORDINATES IN NEAR AERODROME AREA AND AT LANDING WITH RESERVE CHANNEL OF DETERMINING DISTANCE Russian patent published in 2017 - IPC G01S3/46 G01C23/00 

FIELD: physics.

SUBSTANCE: system contains three narrow-base subsystems, each of which includes N receiving antennas, the first and the second analog-to-digital converter, a central electronic computing machine, a low-noise amplifier, N inputs of which are connected to N receiving antennas, the first and the second multi-channel synchronous quadrature receivers, the inputs of which are connected respectively with the first and the second outputs of the low-noise amplifier, and the outputs - with the first inputs of the first and the second analog-to-digital converters, the first and the second information processing channels, the first inputs of which are connected to the outputs of the analog-to-digital converters, and the outputs are connected to the central electronic computing machine; the controller is connected at the input to the central computing machine, the first output of which is connected to the second input of the first multi-channel synchronous quadrature receiver, to the second input of the first analog-to-digital converter and to the second input of the first information processing channel, and the second output - to the second input of the second multi-channel synchronous quadrature receiver, to the second input of the second analog-to-digital converter and to the second input of the second information processing channel; the central processing point, which is composed of three input ports, each input of which is connected through a hybrid fibre-coaxial network to the central electronic computer of each narrow-base subsystem, a keyboard unit, a display unit, a unit for calculating the current speed of the aircraft, a unit for calculating the current flight altitude of the aircraft, a unit for calculating the distance to the, random access memory, a persistent storage device, the first additional output port, a microprocessor, interconnected by the address and data bus; a radio modem of decameter radio wave range, the input of which is connected to the output of the first additional output port, and the output is an overall output of the system providing radio communication with the aircraft.

EFFECT: controlling the aircraft at extremely low altitudes in the near zone of the aerodrome and the withdrawal of the aircraft to the landing point.

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