RU-2861382-C1 - RADIO NAVIGATION SYSTEM FOR DETERMINING LOCATION AND ANGULAR POSITIONS OF AIRCRAFT

RU2861382C1RU 2861382 C1RU2861382 C1RU 2861382C1RU-2861382-C1

Abstract

FIELD: radio navigation engineering. SUBSTANCE: invention is intended for determining the location of an aircraft relative to a landing zone and its angular positions in a local ENU (East, North, Up) coordinate system. A radio navigation system for determining the location and angular positions of an aircraft comprises an airborne radio transmitter and a ground-based radio receiver. The airborne radio transmitter includes, sequentially connected and located on a printed circuit board of the radio transmitter, a triangular pulse shaper, a radio transmitter mixer, and three radio transmitter antennas. The radio transmitter antennas are located at an equal distance from the centre of the aircraft. The ground-based radio receiver consists of one radio receiver antenna and a printed circuit board of the radio receiver. A second-order bandpass filter of the radio receiver, a radio receiver mixer, a low-pass filter of the radio receiver, a modified differential amplifier with feedback, a radio receiver RMS voltage meter, and a radio receiver computing module are soldered on the printed circuit board of the radio receiver, all sequentially connected. The mixers of the radio transmitter and the radio receiver are connected to the control voltage generators of the radio transmitter and the radio receiver, respectively. The modified differential amplifier with feedback is connected to a triangular pulse shaper of the radio receiver. The radio transmitter and radio receiver antennas are connected to the printed circuit boards of the radio transmitter and the radio receiver, respectively, by means of SMA connectors of the radio transmitter and the radio receiver, respectively. EFFECT: priori simultaneous determination of the aircraft location relative to the landing zone and the angular positions of the aircraft. 1 cl, 2 dwg

Inventors

Lysov Stanislav Sergeevich
Dudarev Nikolai Valerevich

Dates

Publication Date: 20260505
Application Date: 20251006

Claims (1)

A radio navigation system for determining the location and angular positions of an aircraft, comprising an on-board radio transmitter, including a triangular pulse generator unit of the radio transmitter, a radio transmitter mixer connected to a control voltage generator of the radio transmitter, and three radio transmitter antennas located at an equal distance from the center of the aircraft and connected to the printed circuit board of the radio transmitter by means of SMA connectors of the radio transmitter, characterized in that the system additionally comprises a ground radio receiver, consisting of one radio receiver antenna, connected by means of an SMA connector of the radio receiver to the printed circuit board of the radio receiver, on which a second-order bandpass filter of the radio receiver, a radio receiver mixer connected to a control voltage generator of the radio receiver, a low-pass filter of the radio receiver, a modified differential amplifier with radio receiver feedback, connected to the generator are soldered in series triangular pulses of the radio receiver, the effective voltage meter of the radio receiver and the computing module of the radio receiver.

Description

The invention relates to radio navigation technology and is applicable as onboard and ground-based navigation equipment for aircraft. The device is designed to determine the aircraft's location relative to the landing zone and its angular position in the local ENU (East, North, Up) coordinate system. A device described in US Patent No. 3,419,861, MKI GOIS 42C 13/04, filed June 26, 1956, published December 31, 1968, is known from the prior art. It comprises a transmitter emitting a noise signal, a receiving and transmitting antenna, a circulator, a mixer, a delay line, a narrow-band filter, and an actuator circuit. A radio rangefinder is known (patent RU 2 325 670 C1, IPC G01S 13/08), which is intended for measuring short and ultra-short distances and consists of a noise signal transmitter, a circulator, a receiving and transmitting antenna, a mixer, narrow-band filters, frequency detectors, inverters, a memory device, a coincidence device, a resolution device, a NAND element and an actuator circuit. A device for determining the altitude and angular position of an aircraft using radio rangefinders is known, adopted as a prototype (patent RU232108U1). The device for determining the altitude and angular position of an aircraft includes radio rangefinders, comprising three radio rangefinders implemented in the form of 24 GHz microwave rangefinding radars, located at equal distances from one another on the lower hemisphere of the aircraft's surface, directed downward relative to said surface, and a computing module. The radio rangefinders and the computing module are mounted on a single base, the input of each radio rangefinder is connected to a power source, and the output is connected to the input of the computing module. The main drawbacks of the analog and prototype described above are the a posteriori nature of the range information from the aircraft to the landing point, the devices' vulnerability to external interference from random reflections from external objects, and the inability to determine the aircraft's location in space. This is explained by the fact that the radio rangefinders included in these devices operate by determining the delay time of the reflected probing signal relative to the emitted one and, therefore, can be reflected not only from the target but also from random external objects, which significantly interferes with determining the range from the aircraft to the landing point. Furthermore, neither of the described devices is capable of determining the aircraft's location due to either a single radio rangefinder in the case of No. 3.419.861 and RU 2 325 670 C1, or the lack of a reference signal source with a constant ground position in the case of RU232108U1. The technical objective of the invention is to simultaneously and a priori determine the aircraft's location relative to the landing zone and its angular position. This is achieved by incorporating multiple radio transmitter antennas onboard the aircraft, coupled with a radio receiver for a reference signal generator in the aircraft's landing zone, and a processing module that calculates the aircraft's location relative to the landing zone and its angular position in the local ENU coordinate system based on distance data from the radio transmitter antennas to the radio receiver antenna. The technical task and result are achieved in that the radio navigation complex for determining the location and angular positions of an aircraft contains one on-board radio transmitter, including a triangular pulse generator unit of the radio transmitter, a radio transmitter mixer connected to a control voltage generator of the radio transmitter, and three radio transmitter antennas located at an equal distance from the center of the aircraft, connected to the printed circuit board of the radio transmitter by means of SMA connectors of the radio transmitter according to the invention, the ground radio receiver consists of a radio receiver antenna, soldered on the printed circuit board of the radio receiver and connected in series with each other, a second-order bandpass filter of the radio receiver, a radio receiver mixer connected to a control voltage generator of the radio receiver, a low-pass filter of the radio receiver, a triangular pulse generator of the radio receiver, connected to a modified differential a feedback amplifier of the radio receiver, a current-voltage meter (counter) of the radio receiver and a computing module of the radio receiver, wherein the printed circuit board of the radio receiver is connected to the antenna of the radio receiver via the SMA connector of the radio receiver. The essence of the device is as follows: a radio navigation complex for determining the location and angular positions of an aircraft contains one on-board radio transmitter, including a triangular pulse generator unit of the radio transmitter (TPG), connected in series with each other and located on a printed circuit board, a radio transmitter