RU-2861558-C1 - PHASE DIRECTION FINDER FOR WIDEBAND SIGNALS

RU2861558C1RU 2861558 C1RU2861558 C1RU 2861558C1RU-2861558-C1

Abstract

FIELD: radar; radio navigation. SUBSTANCE: invention can be used to determine the angular coordinates of signal radiation sources. In the phase direction finder, symmetrical heterodyning of signals is used. EFFECT: maintaining high accuracy of measuring angular coordinates during dynamic adaptation of the passband of band-pass filters in real time. 1 cl, 1 dwg

Inventors

KOVALENKO VLADIMIR PAVLOVICH
TURLOV ZALIMKHAN NURLANOVICH
ZHUKOV ALEKSANDR OLEGOVICH
Valyaev Igor Nikolaevich
Filippov Fedor Evgenevich

Dates

Publication Date: 20260506
Application Date: 20251017

Claims (1)

A phase direction finder comprising two spaced antennas, two high-frequency amplifiers connected in series with them, first and second mixers connected in series with them, a local oscillator whose output is connected to second inputs of the first and second mixers, two bandpass filters with an adjustable passband, two delay lines, a first phase meter, a calculator, a spectrum analyzer and a correlation function analyzer connected in series, wherein the input of the spectrum analyzer is connected to the output of the first mixer, the outputs of the spectrum analyzer and the correlation function analyzer are connected to the first and second inputs of the calculator, respectively, characterized in that a first and second intermediate frequency amplifier are introduced into it, connected in series with the first and second mixers, respectively, a third, fourth, fifth and sixth mixers, wherein the first inputs of the third and sixth mixers are connected to the output of the first intermediate frequency amplifier, and the first inputs of the fourth and fifth mixers are connected to the output of the second intermediate frequency amplifier, second and third local oscillators, wherein the first and second outputs of the second local oscillator are connected to the second inputs third and fourth mixers, respectively, and the first and second outputs of the third heterodyne are connected to the second inputs of the fifth and sixth mixers, respectively, first and second adders, wherein the inputs of the first adder are connected to the outputs of the third and sixth mixers, respectively, and the inputs of the second adder are connected to the outputs of the fourth and fifth mixers, respectively, first and second bandpass filters with adjustable bandwidth are connected in series to the outputs of the adders, first and second delay lines, respectively, a multiplier, the inputs of which are connected to the outputs of the delay lines, two narrow-band filters, the inputs of which are connected to the output of the multiplier, a second phase meter, the first input of which is connected to the output of the second narrow-band filter, and the first input of the first phase meter is connected to the output of the first narrow-band filter, the second input of the first phase meter is connected to the third output of the second heterodyne, and the second input of the second phase meter is connected to the third output of the third heterodyne, the outputs of the phase meters are connected to the third and fourth inputs of the calculator, the first and second outputs of the calculator are connected to the control inputs of the delay lines, respectively, and The third output is connected to the control inputs of the bandpass filters.

Description

The invention relates to the field of radar, radio navigation and can be used to determine the angular coordinates of signal emission sources. Phase direction finding methods, phase direction finders and phase direction finder receiver structures are known (patents RF No. 2669385, RF No. 2681203, RF No. 2822466, Space trajectory measurements. General editorship by P.A. Agadzhanov et al. Moscow: Sov. Radio, 1969, pp. 244-245). The closest in technical essence to the proposed invention is the phase method for direction finding of broadband signals and the phase direction finder, Russian Federation patent No. 2822466, which was chosen as a prototype. The well-known phase direction finder provides reception of signals on two spaced antennas, conversion of received signals to an intermediate frequency, filtering of signals with bandpass filters with an adjustable passband, uses compensating delay lines, measures the spectrum of the received signal, based on the results of these measurements the adaptation of the passband of the bandpass filters to the spectrum of the signal is carried out, calculates the correlation function of the signal, determines the values of the correlation-phase frequency, measures the phase difference of the signals, calculates the delay time of the received signals and calculates the cosine of the direction angle to the radiation source. The prototype's main advantage is the ability to adapt the bandpass filter bandwidth to the spectrum width of received signals. This ensures maximum utilization of signal energy and, consequently, high measurement accuracy. A drawback of the prototype is the need to calibrate the phase response of bandpass filters over a wide range of passbands. Calibration is virtually impossible with dynamic adaptation in real time. The features of the invention, which coincide with the features of the prototype, are two antennas, two high-frequency amplifiers, two mixers, a local oscillator, two band-pass filters with adjustable bandwidth, two delay lines, a phase meter, a spectrum analyzer, a correlation function analyzer and a calculator. The technical objective of the invention is to eliminate the influence of the phase characteristics of bandpass filters on the accuracy of phase measurements. The technical problem is solved by using symmetrical heterodyning of signals. The technical result is maintaining high measurement accuracy during dynamic adaptation in real time. The essence of the invention being patented is explained by the description and drawing presented in Fig. 1. Fig. 1 shows the structural diagram of the patented phase direction finder for broadband signals. The phase direction finder comprises two spaced antennas 1 and 2, two high-frequency amplifiers 3 and 4 connected in series with them, two mixers 5 and 6 connected in series with them, two intermediate frequency amplifiers 7 and 8 connected in series with them, a local oscillator 9, the output of which is connected to the second inputs of mixers 5 and 6, a third 10, fourth 11, fifth 12 and sixth 13 mixers, wherein the first inputs of the third 10 and sixth 13 mixers are connected to the output of the first intermediate frequency amplifier 7, and the first inputs of the fourth 11 and fifth 12 mixers are connected to the output of the second intermediate frequency amplifier 8, a second 14 and third 15 local oscillators, wherein the first and second outputs of the second local oscillator 14 are connected to the second inputs of the third 10 and fourth 11 mixers, respectively, and the first and second outputs of the third local oscillator 15 are connected to the second inputs of the fifth 12 and sixth 13 mixers, respectively, the first 16 and second 17 adders, wherein the inputs of the first adder 16 are connected to the outputs of the third 10 and sixth 13 mixers, respectively, and the inputs of the second adder 17 are connected to the outputs of the fourth 11 and fifth 12 mixers, respectively, the first 18 and second 19 bandpass filters with an adjustable passband and the first 20 and second 21 delay lines, respectively, are connected in series to the outputs of the adders, a multiplier 22, the inputs of which are connected to the outputs of the delay lines 20 and 21, two narrow-band filters 23 and 24, the inputs of which are connected to the output of the multiplier 22, the first 25 and second 26 phase meters, wherein the first input of the first phase meter 25 is connected to the output of the first narrow-band filter 23, and the second input of the first phase meter 25 is connected to the third output of the second heterodyne 14, the first input of the second phase meter 26 connected to the output of the second narrow-band filter 24, and the second input of the second phase meter 26 is connected to the third output of the third heterodyne 15, a spectrum analyzer 27 and a correlation function analyzer 28 connected in series, a calculator 29, wherein the input of the spectrum analyzer 27 is conne