Mode of direction finding and direction finder for its realization

FIELD: proposed invention refers to radiolocation and may be used for definition of position and movement of sources of radiation of complex signals.

SUBSTANCE: achieved technical result of invention is increase of trustworthiness of reception of useful signals with a priori known carrier frequency and removal of ambiguity of direction finding by suppression false signals (interference) not interesting for radio control and coming from other directions. At that proposed arrangement has receiving antenna with circle diagram of radiation pattern , receiving antenna with cardioidic diagram of radiation pattern, block for control over diagram of radiation pattern, first and second receiving sets, division block, threshold block, former of control pulse, first and second keys, meter of frequency, memory block, block for comparison of codes, motor and register block.

EFFECT: increases trustworthiness of direction finding.

4 dwg

 

The proposed technical solutions related to radar and can be used to determine the location and movement of radiation sources of complex signals.

Known methods of direction finding and direction finders for their implementation (RF patents №№2.003.131, 2.006.872, 2.010.258, 2.012.010, 2.134.429, 2.155.352, 2.175.770; Space trajectory measurement. Under the General editorship Paerajanov and other M: Owls. radio, 1969, s-245; Kinkelin IE and other Phase method for the determination of coordinates. M: Owls. radio, 1979; Space radio systems. Edited Shibukawa. M: Owls. radio, 1967, p.134-137, RES,b, and others).

Of the known methods and devices closest to the proposed are a method and apparatus for phase direction finding (Space radio systems. Edited Shibukawa. M: Owls. radio, 1967, p.134-137, RIS,b), which is selected as the base object.

According to a known method the signals are carried out on two antennas, remote from each other by the distance d. Taken fluctuations amplify and limit, after which the phase discriminator (detector) is produced by comparing the phases of oscillations, the last two channels. The phase shift is determined by the ratio

Δϕ=2πd/λ*Cosα,

where α - the angle between the measuring base and direction to the radiation source signals;

d - the distance between what Nanami (test database);

λ - wavelength.

In the phase direction finder with a moving (rotating) base (ri,b) voltage error is used to generate the voltage control motor connected through a gear box with the antenna system.

Known technical solutions do not provide reliable receiving and direction-finding signals with a priori known carrier frequency. This is because the bandwidth of the receiver-the radio signal reaches a large number of false signals (noise)that are not of interest for radio control and coming from other directions.

In addition, the known technical solution inherent contradiction between accuracy and certainty of the location of the radiation source signals. Indeed, according to the above formula to increase the accuracy of measurements it is necessary to increase the relative size of the measuring base d/λ. However, with increasing d/λ phase shift Δϕ exceeds the value of 2πi.e. comes the ambiguity of reference angular coordinates α.

An object of the invention is to increase the reliability of receiving and direction finding useful signals with a priori known carrier frequency and dealing with ambiguity direction finding by suppressing spurious signals (noise)that are not of interest for radio control and coming from the other directions.

The problem is solved in that a method of direction finding, based, in accordance with blijaishim analogue, on the reception of signals on the two antennas and their strengthening, with one of the antennas rotate differs from the closest analogue of the fact that the directivity of the rotating antenna is chosen in the form of a cardioid, rotate the antenna with a cardioid polar pattern to match the direction of the zero reception direction to the radiation source of useful signals with a priori known carrier frequency, divide predetection reception equipment with a circular beam pattern voltage predetection reception equipment with cardioid polar pattern voltage, comparing a voltage proportional to the private from division with the threshold voltage at the threshold voltage, which corresponds to the coincidence with the direction of the zero reception direction to the radiation source of useful signals with a priori known frequency, form the control pulse, which allows the measurement of the carrier frequency of the received signals, compare the code of the measured carrier frequency ID a priori known frequency and in equality stop the rotation of the antenna with a cardioid polar pattern, and fix the true bearing to the source of useful signals and rorno known frequency.

The problem is solved in that direction finder comprising, in accordance with the closest analogue, two receiver antennas, one of which is made rotatable and is connected through a control block diagram of the focus motor differs from the closest analogue is the fact that it has a unit, the threshold unit, the imaging unit impulse control, two keys, a speed meter, a memory block, the block comparison code and the registration unit, and to output a rotating antenna connected in series, the control block pattern, the second receiver unit, the second input is through the first receiver connected to the output of the fixed antenna threshold unit, the imaging unit control pulse, the first key, a second input connected to the second output of the first receiver, the speed meter and the unit of comparison code, a second input connected to the output of the memory block, and the output connected to the control input of the motor, to the second output of the control block pattern serially connected second key, a second input connected to the output of the Comparer codes, and block registration.

A device that implements the proposed method contains (1) consistently included receiving antenna 2 with cardioid polar pattern, the unit 3 control is the exercise by the pattern, a second receiver 5, part 6, division, second entrance through which the first receiver 4 connected to the output of the receiving antenna 1 with a circular pattern, a threshold unit 7, the imaging unit 8 of the control pulse, the first key 9, a second input connected to the second output of the first receiver 4, the meter 10 frequency, block 12 comparison code, a second input connected to the output of the memory block 11, and the motor 13, the output of which is connected to the second input unit, unit 3 control pattern, sequentially connected to the second output unit 3 controls the directivity of the second key 14 second input connected to the output unit 12 comparison of codes and block 15 of the Desk.

The proposed method is implemented as follows.

Receiving antenna 1 is stationary and has a circular radiation pattern, antenna 2 is rotated, is connected through the unit 3 control pattern (reducer) with the motor 12 and has a cardioid pattern, which is formed by a frame and vertical vibrator (figure 2).

Each receiver 4 (5) consists of a cascaded amplifier of high frequency and of the amplitude detector. The amplitude of the received signals at the output of the receiver 4 does not depend on the direction their coming from circular pattern of the first pickup is Noah antenna 1 (figure 4). The amplitude of the received signals at the output of receiver 5 depends on the direction of their coming due to the cardioid pattern of the second receiving antenna 2. Envelopes of the input signals from the outputs of the amplitude detectors (the first outputs of the receivers 4 and 5) are fed to the two inputs of block 6 of division, respectively.

To implement the selection of useful signals in the direction by means of motor 12 and control unit 3 polar pattern cardioid radiation pattern of the receiving antenna 2 rotate to align the zero failure with the direction of arrival of the signals (figure 4). The amplitude of the signals in this direction at the output of receiver 5 is close to zero, so the output of block 6 of division, exercising division of the amplitude of the output signal from the receiver 4 to the amplitude of the signal output from the receiver 5, in this moment, the voltage will be maximum.

The threshold value set so that the threshold unit 7 worked only from signals coming from the zero direction.

When the alarm threshold unit 7 driver 8 generates a pulse which is fed to the control input key 9, opening it. In the initial state, the keys 9 and 14 are always closed.

High-frequency signal from the second output of the first receiver 4 (from the output of the amplifier high frequency) through public key 9 is fed to the input of 1 meter frequency. Code measured carrier frequency of the received signals fed to the first input unit 12 comparison of codes, the second input of which receives the code a priori known frequency, pre-recorded in the memory block 11.

If the codes listed frequencies are equal, the block 12 comparison code generates the control pulse, which is supplied to the control input of the motor 13, stopping him, and on the control input key 14, opening it.

The value of the angular coordinates αpdetermining the direction to the radiation source of useful signals (true bearing), through the public key 14 is fed to the input of block 15 of the Desk and fixed.

The dependence of the output voltage Uo(α) receivers 4 and 5 from the direction of arrival of electromagnetic waves is a dynamical characteristics (figure 3).

Receiving antenna 2 has a high DF sensitivity, which represents the slope of DF characteristics in the direction of zero reception

but the low signal-to-noise.

The joint use of two antennas 1 and 2 with a circular and cardioid directional diagrams eliminate this disadvantage, preserving dignity.

Thus, the proposed technical solutions are compared with the reference objects provide the increased reliability of receiving and direction finding useful signals with a priori known carrier frequency and dealing with ambiguity direction finding. This is achieved by increasing the signal-to-noise ratio when using an antenna with a cardioid polar pattern with high DF sensitivity, suppression of spurious signals (noise)that are not of interest for radio control and coming from other directions, and measuring the carrier frequency of the received signals at the maximum signal-to-noise.

Direction finder that contains two receiver antennas, one of which is made rotatable and is connected through a control block diagram of the focus motor, characterized in that it is equipped by the unit, the threshold unit, the imaging unit impulse control, two keys, a speed meter, a memory block, the block comparison code and the registration unit, and to output a rotating antenna connected in series, the control block pattern, the second receiver unit, the second input is through the first receiver connected to the output of a fixed antenna with a circular pattern, a threshold unit, the imaging unit control pulse, the first key, the second an input connected to the second output of the first receiver, the speed meter and the unit of comparison code, a second input connected to the output of the memory block, and the output connected to the control input of the motor, to the second output of the lock control pattern serially connected second key, a second input connected to the output of the Comparer codes, and block registration.



 

Same patents:

FIELD: radio detection and ranging, radio navigation, applicable for determining the angular co-ordinates of the signal radiation source.

SUBSTANCE: the claimed method is realized with the aid of a device having three receiving derails, three receivers, two phase-meters, computer, adder and a recording unit connected in a definite way.

EFFECT: enhanced range of one-valued measurement of angles at a small length of the rough measuring base.

3 dwg

FIELD: finding coordinates of radio source.

SUBSTANCE: as planes of position of radio source the planes are used, which have line of position of radio source, which has to be crossing of two hyperbolic surfaces pf position corresponding to time-difference measurements. Method is based upon reception of signal of radio source by four aerials, on measurement of three differences in time of reception of radio source signal by aerials, which aerials form measuring bases, upon subsequent processing of results of measurements for calculation of values of parameters of position of radio source and for calculating coordinate of radio source as crossing point of three planes of position. Device for realization of the method has four aerials which aerials form three pairs of measuring bases, which bases are disposed in non-coincident planes, three calculators for calculating parameters of position of radio source, calculator of radio source coordinates made in form of unit for solving system of linear equations and indication unit.

EFFECT: precise measurement of linear coordinates of object.

2 cl, 8 dwg

FIELD: radio electronics, applicable for passive radio monitoring in multi-channel system designed for direction finding of several sources of radio emission simultaneously getting into the reception zone.

SUBSTANCE: expanded functional potentialities by way of direction finding in two planes of several sources of radio emission simultaneously getting into the reception zone.

EFFECT: expanded functional potentialities.

2 dwg

FIELD: the invention refers to the field of radio technique and may be used in range-difference systems of definition of the position of the sources of radio emissions.

SUBSTANCE: the mode is based on measuring of two differences of distances Δr12 and Δr13 to two pairs of mobile supporting points {O1,O2}and {O1,O3 , } the coordinates ,j= 1,2,3 supporting points Oj in the moment of time of measuring of distances, then the vector of measured values is transformed into the vector of the coordinates of the three points F1,F2 and M belonging to a hyperbolina: the vector is stored and transmitted along the channels of transmitting information into the center of processing information for using it in quality of initial data at solution a range-difference navigational task; at that the points F1 and F2 defines the focuses of the hyperbolina if it is a hyperbola or an ellipse or a focus and its projection on a directrix if it is a parabola and the third point belongs to the hyperbolina in such a manner that the position of its project on the direct F1F2 defines the form of the curve of the second order.

EFFECT: decreases volume of stored and transmitted data.

5 dwg

FIELD: the proposed mode and arrangement refer to the field of radio electronics and may be used for definition of position of sources of emitting complex signals.

SUBSTANCE: the phase direction finder realizing the proposed phase mode of direction finding, has receiving aerials, receivers and a supporting generator, an impulse generator, an electronic commutator, a phase changer on 90, a phase detector and an indicator, a heterodyne, a mixer, an amplifier of an intermediate frequency, multipliers and band filters and a line of delay.

EFFECT: elimination of antagonism between requirements to accuracy of measuring and unique angle reading at phase mode of direction finding of sources of emitting of complex signals.

2 cl, 2 dwg

FIELD: radio engineering.

SUBSTANCE: device has the first, the second and the third receiving antennas, the first, the second and the third high frequency amplifiers, the first and the second heterodynes, the first, the second and the third mixers, the first, the second and the third multipliers, the first, the second, the third and the fourth narrowband filters, the first, the second and the third intermediate frequency amplifiers, frequency multiplier by two, the first, the second and the third phase detectors, the first and the second correlator units, the first, the second, the third and the fourth threshold units, the first, the second, the third and the fourth keys and unit for recording.

EFFECT: wide range of functional applications.

3 dwg

FIELD: radio engineering, applicable in electromagnetic reconnaissance, radio navigation and radio detection and ranging for determination of the direction to the source of radiation or reflection of radio waves.

SUBSTANCE: the phase direction finder has two antennas, two receiving paths, three phase shifters, two phase detectors, two limiters, three adders, two modulus computation devices, subtracting device, amplifier, comparator, gate circuit and an oscillator.

EFFECT: enhanced accuracy of direction finding and excepted its dependence of the attitude of the object of direction-finding.

2 cl, 10 dwg

FIELD: radio engineering, applicable for location of posthorizon objects by radiations of their radars, for example, of naval formations of battle ships with operating navigational radars with the aid of coastal stationary or mobile passive radars.

SUBSTANCE: the method consists in detection of radiations and measurement of the bearings (azimuths) with the use of minimum two spaced apart passive radars, and calculation of the coordinates of the sources of r.f. radiations by the triangulation method, determination of location is performed in three stages, in the first stage the posthorizon objects are searched and detected by the radiation of their radars at each passive radar, the radio engineering and time parameters of radar radiations are measured, the detected radars with posthorizon objects are identified by the radio engineering parameters of radiations and bearing, and continuous tracking of these objects is proceeded, the information on the objects located within the radio horizon obtained from each passive radar is eliminated, the working sector of angles is specified for guidance and tracking of the selected posthorizon object, in the second stage continuous tracking of one posthorizon object is performed at least by two passive radars, and the time of reception of each radar pulse of this object is fixed, in the third stage the period of scanning of this radar, the difference of the angles of radiation by the main radar beam of each passive radar and the range to the posthorizon object with due account made for the difference of the angles of radiation are determined by the bearings (azimuths) measured by the passive radar and the times of reception of each pulse of the tracked radar. The method is realized with the aid at least of two spaced apart passive radars, each of them has aerials of the channel of compensation of side and phone lobes, a narrow-band reflector-type aerial, series-connected noiseless radio-frequency amplifier, multichannel receiving device, device of primary information processing and measurement of carrier frequency, amplitude and time of reception of signals of the detected radar, device of static processing of information and measurement of the bearing, repetition period, duration of the train and repetition of the pulse trains and a device for calculation of the difference of the angle of radiation of the aerials of the passive radars by the detected radar.

EFFECT: reduced error of measurement of the coordinates of posthorizon sources of radio-frequency radiations.

3 cl, 5 dwg

FIELD: finding of azimuth of radio emission source (RES) in wide-base direction finding systems.

SUBSTANCE: angle of azimuth of RES is measured with high degree of precision due to elimination of methodical errors in direction finding caused by linearization of model electromagnet wave propagation wave front. As surface of RES location the plane is used which has RES line of location which has to be crossing of two hyperbolic surfaces of location corresponding to difference-time measurement. Method of RES direction finding is based upon receiving its signal by three aerials disposed randomly, measuring of two time differences of RES signal receiving by aerials which form measuring bases and subsequent processing of results of measurement to calculate values of RES angles of azimuth and coordinates of point through which the RES axis of sight passes. The data received are represented in suitable form. Device for realization of the method has three aerials disposed at vertexes of random triangle, two units for measuring time difference of signal receiving, computing unit and indication unit. Output of common aerial of measuring bases is connected with second inputs of time difference meters which receive signals from outputs of the rest aerials. Measured values of time differences enter inputs of computing unit which calculates values of RES angle of azimuth and coordinates of point through which the RES axis of sight passes. Data received from output of computing analyzing unit enter indication unit intended for those data representation.

EFFECT: widened operational capabilities of direction finder.

2 cl, 7 dwg

The phase signal, // 2206901

FIELD: finding of azimuth of radio emission source (RES) in wide-base direction finding systems.

SUBSTANCE: angle of azimuth of RES is measured with high degree of precision due to elimination of methodical errors in direction finding caused by linearization of model electromagnet wave propagation wave front. As surface of RES location the plane is used which has RES line of location which has to be crossing of two hyperbolic surfaces of location corresponding to difference-time measurement. Method of RES direction finding is based upon receiving its signal by three aerials disposed randomly, measuring of two time differences of RES signal receiving by aerials which form measuring bases and subsequent processing of results of measurement to calculate values of RES angles of azimuth and coordinates of point through which the RES axis of sight passes. The data received are represented in suitable form. Device for realization of the method has three aerials disposed at vertexes of random triangle, two units for measuring time difference of signal receiving, computing unit and indication unit. Output of common aerial of measuring bases is connected with second inputs of time difference meters which receive signals from outputs of the rest aerials. Measured values of time differences enter inputs of computing unit which calculates values of RES angle of azimuth and coordinates of point through which the RES axis of sight passes. Data received from output of computing analyzing unit enter indication unit intended for those data representation.

EFFECT: widened operational capabilities of direction finder.

2 cl, 7 dwg

FIELD: radio engineering, applicable for location of posthorizon objects by radiations of their radars, for example, of naval formations of battle ships with operating navigational radars with the aid of coastal stationary or mobile passive radars.

SUBSTANCE: the method consists in detection of radiations and measurement of the bearings (azimuths) with the use of minimum two spaced apart passive radars, and calculation of the coordinates of the sources of r.f. radiations by the triangulation method, determination of location is performed in three stages, in the first stage the posthorizon objects are searched and detected by the radiation of their radars at each passive radar, the radio engineering and time parameters of radar radiations are measured, the detected radars with posthorizon objects are identified by the radio engineering parameters of radiations and bearing, and continuous tracking of these objects is proceeded, the information on the objects located within the radio horizon obtained from each passive radar is eliminated, the working sector of angles is specified for guidance and tracking of the selected posthorizon object, in the second stage continuous tracking of one posthorizon object is performed at least by two passive radars, and the time of reception of each radar pulse of this object is fixed, in the third stage the period of scanning of this radar, the difference of the angles of radiation by the main radar beam of each passive radar and the range to the posthorizon object with due account made for the difference of the angles of radiation are determined by the bearings (azimuths) measured by the passive radar and the times of reception of each pulse of the tracked radar. The method is realized with the aid at least of two spaced apart passive radars, each of them has aerials of the channel of compensation of side and phone lobes, a narrow-band reflector-type aerial, series-connected noiseless radio-frequency amplifier, multichannel receiving device, device of primary information processing and measurement of carrier frequency, amplitude and time of reception of signals of the detected radar, device of static processing of information and measurement of the bearing, repetition period, duration of the train and repetition of the pulse trains and a device for calculation of the difference of the angle of radiation of the aerials of the passive radars by the detected radar.

EFFECT: reduced error of measurement of the coordinates of posthorizon sources of radio-frequency radiations.

3 cl, 5 dwg

FIELD: radio engineering, applicable in electromagnetic reconnaissance, radio navigation and radio detection and ranging for determination of the direction to the source of radiation or reflection of radio waves.

SUBSTANCE: the phase direction finder has two antennas, two receiving paths, three phase shifters, two phase detectors, two limiters, three adders, two modulus computation devices, subtracting device, amplifier, comparator, gate circuit and an oscillator.

EFFECT: enhanced accuracy of direction finding and excepted its dependence of the attitude of the object of direction-finding.

2 cl, 10 dwg

FIELD: radio engineering.

SUBSTANCE: device has the first, the second and the third receiving antennas, the first, the second and the third high frequency amplifiers, the first and the second heterodynes, the first, the second and the third mixers, the first, the second and the third multipliers, the first, the second, the third and the fourth narrowband filters, the first, the second and the third intermediate frequency amplifiers, frequency multiplier by two, the first, the second and the third phase detectors, the first and the second correlator units, the first, the second, the third and the fourth threshold units, the first, the second, the third and the fourth keys and unit for recording.

EFFECT: wide range of functional applications.

3 dwg

FIELD: the proposed mode and arrangement refer to the field of radio electronics and may be used for definition of position of sources of emitting complex signals.

SUBSTANCE: the phase direction finder realizing the proposed phase mode of direction finding, has receiving aerials, receivers and a supporting generator, an impulse generator, an electronic commutator, a phase changer on 90, a phase detector and an indicator, a heterodyne, a mixer, an amplifier of an intermediate frequency, multipliers and band filters and a line of delay.

EFFECT: elimination of antagonism between requirements to accuracy of measuring and unique angle reading at phase mode of direction finding of sources of emitting of complex signals.

2 cl, 2 dwg

FIELD: the invention refers to the field of radio technique and may be used in range-difference systems of definition of the position of the sources of radio emissions.

SUBSTANCE: the mode is based on measuring of two differences of distances Δr12 and Δr13 to two pairs of mobile supporting points {O1,O2}and {O1,O3 , } the coordinates ,j= 1,2,3 supporting points Oj in the moment of time of measuring of distances, then the vector of measured values is transformed into the vector of the coordinates of the three points F1,F2 and M belonging to a hyperbolina: the vector is stored and transmitted along the channels of transmitting information into the center of processing information for using it in quality of initial data at solution a range-difference navigational task; at that the points F1 and F2 defines the focuses of the hyperbolina if it is a hyperbola or an ellipse or a focus and its projection on a directrix if it is a parabola and the third point belongs to the hyperbolina in such a manner that the position of its project on the direct F1F2 defines the form of the curve of the second order.

EFFECT: decreases volume of stored and transmitted data.

5 dwg

FIELD: radio electronics, applicable for passive radio monitoring in multi-channel system designed for direction finding of several sources of radio emission simultaneously getting into the reception zone.

SUBSTANCE: expanded functional potentialities by way of direction finding in two planes of several sources of radio emission simultaneously getting into the reception zone.

EFFECT: expanded functional potentialities.

2 dwg

FIELD: finding coordinates of radio source.

SUBSTANCE: as planes of position of radio source the planes are used, which have line of position of radio source, which has to be crossing of two hyperbolic surfaces pf position corresponding to time-difference measurements. Method is based upon reception of signal of radio source by four aerials, on measurement of three differences in time of reception of radio source signal by aerials, which aerials form measuring bases, upon subsequent processing of results of measurements for calculation of values of parameters of position of radio source and for calculating coordinate of radio source as crossing point of three planes of position. Device for realization of the method has four aerials which aerials form three pairs of measuring bases, which bases are disposed in non-coincident planes, three calculators for calculating parameters of position of radio source, calculator of radio source coordinates made in form of unit for solving system of linear equations and indication unit.

EFFECT: precise measurement of linear coordinates of object.

2 cl, 8 dwg

FIELD: radio detection and ranging, radio navigation, applicable for determining the angular co-ordinates of the signal radiation source.

SUBSTANCE: the claimed method is realized with the aid of a device having three receiving derails, three receivers, two phase-meters, computer, adder and a recording unit connected in a definite way.

EFFECT: enhanced range of one-valued measurement of angles at a small length of the rough measuring base.

3 dwg

FIELD: proposed invention refers to radiolocation and may be used for definition of position and movement of sources of radiation of complex signals.

SUBSTANCE: achieved technical result of invention is increase of trustworthiness of reception of useful signals with a priori known carrier frequency and removal of ambiguity of direction finding by suppression false signals (interference) not interesting for radio control and coming from other directions. At that proposed arrangement has receiving antenna with circle diagram of radiation pattern , receiving antenna with cardioidic diagram of radiation pattern, block for control over diagram of radiation pattern, first and second receiving sets, division block, threshold block, former of control pulse, first and second keys, meter of frequency, memory block, block for comparison of codes, motor and register block.

EFFECT: increases trustworthiness of direction finding.

4 dwg

Up!