The phase signal,

 

(57) Abstract:

The invention relates to the field of radar and radio navigation, in particular the phase direction finders. Proposed phase signal with N antennas, in which the outputs of the antennas introduced N managed discrete phase and frequency adder. The phase difference of the signals required for each pair of antennas are computed in the digital processor through a set of values of the amplitude envelope of the total signal obtained from the output of the receiver the total signal at different combinations of phase shifts in the phase, sequentially installed during each working cycle of the direction finder. The proposed device can be used for the phase direction finding sources of narrowband signals in the plane or in space that is achievable technical result. 1 Il.

The invention relates to the field of radar and radio navigation, in particular for direction finders for determining the direction to the measurement of the phase shift of the signals taken from the diversity antenna.

Known phase DFS, the action of which is based on forming the vector sum of the signals received by a pair of spaced antiplatelets the amplitudes of the four parallel generated vector sum signals, corresponding to the four values of the phase shift between the summed signals. The direction finders of this type are described, for example, in U.S. patent N 3.631.491, NCI 343/113R, MKI G 01 S 3/46 and in the French patent N 2.718.252, MKI G 01 S 3/04 (application N 9403665 from 29.03.94).

Closest to the claimed device is direction finding, described in the French patent N 2.718.252. The known device comprises N antennas, the shaper is the four vector of the amounts of the high-frequency switches, inputs and outputs, multi-channel receiver with envelope detectors and ADCS on the outputs of each channel, the digital processor. A disadvantage of the known device is the low accuracy due to the variability and instability of the transfer characteristics of the phase-shifting and switching of high-frequency elements and the complexity of the schemes. An object of the invention is to improve the accuracy.

The solution of this problem is achieved by the fact that the direction finding device containing N antennas and connected in series receiver envelope detector and the ADC output and a digital processor, put N managed the discrete phase with the number of positions on the phase shift M is greater than two and increments the phase shift 2/M, Blo is ately included respectively between the outputs of the antennas and high-frequency inputs of the adder, the output of which is connected to the receiver input, control inputs of the phasers are connected respectively to the N outputs of the control unit phasers, the input of the synchronization signal which is connected to the output of the synchronization signal digital processor generating the measurement result of the phase difference signalm,nfor each of the desired m-th, n-th pair of antennas according to the algorithm:

(1)

where: i = 1, 2,... (MN-1), MN- the current number of combinations of phase shifts in the phase, sequentially set within a working cycle;

(m-n)i- the difference of phase shifts in the phase of the m-th, n-th pair of antennas;

xithe reference ADC output of the receiver when the i-th combination of phase shifts in the phase.

The work of the proposed direction finder is illustrated a block diagram and a description of the operating principle. On the block diagram indicated:

1 antenna; 2 - driven discrete phase shifter; 3 - control unit phasers; 4 - high frequency adder; 5 receiver envelope detector and the ADC output; 6 - digital processor.

Managed a discrete phase 2 included between the outputs of the antennas and, accordingly, high-frequency inputs of the adder 4. digital processor 6. The first output of the digital processor 6 is the output of the measurement result. The second output of the digital processor 6 is the output of the sync signal and is connected to the input of the synchronization signal control unit 3. The outputs of the control unit 3 is connected with the control inputs of the controlled discrete phase 2.

The antenna is made in the form sabnapravlenii emitters, beam width which covers the expected range of angles of bearing. Phasers made on ferrites or semiconductor diode with electronic control. The control unit is made on the basis of the binary register or counter with the shapers of currents or voltages at the outputs of the bits.

The device works in cycles, consisting of consecutive heartbeats. In each i-th step of the working cycle of the digital processor 6 generates the control unit 3 phasers synchronization signal containing the number i of this measure. The control unit 3 generates a combination of currents and voltages required for installation in controlled discrete phase 2 specific combination of phase shifts corresponding to the number i of this measure. After the end of the transient processes in manageable the La xifrom the output of the receiver, stores it, and outputs the synchronization signal containing the number of the new (i + 1)-th cycle. After completion of all cycles of the operating cycle, the total number of which is equal to the number of all possible combinations of States of phasers, digital processor computes estimates of the differences between the phases of the signals in all of the required pairs of antennas in accordance with the algorithm (1).

It is assumed that the cycle time measurement is significantly less than the correlation time of the signal amplitude.

The work of the proposed device is based on the use of voltage as a function of x at the output of square-law detector, envelope amount N of high-frequency signals from their amplitudes akthe initial phaseskand from the values of phase shiftskthe phasers. This dependence is described by the expression:

(2)

If you have the required set of known valuesk,l=k-lexpression (2) form a system of equations that can be solved relatively unknown quantitiesk,l=k-l.

In the proposed device uses M positional phasers with discretes for phase 2/M, M is an integer greater than two. In each working cycle resets all in the Yes (2) corresponds to the algorithm (1), implemented with a digital processor.

Because of the symmetry of the input part of the proposed device has the effect of balanced suppress the influence of the amplitude and phase errors of the phasers on the bearing measurement.

The proposed device can be used for the phase direction finding sources of narrowband signals in the plane or in space.

The phase signal containing N antennas and connected in series receiver with a detector of the flexor and the ADC output and a digital processor, characterized in that it introduced N managed the discrete phase with the number of positions on the phase shift M is greater than two and increments the phase shift 2M, the control unit phasers, high-frequency adder with N inputs, while managed discrete phasers included respectively between the outputs of the antennas and high-frequency inputs of the adder, the output of which is connected to the receiver input, control inputs of the phasers are connected respectively to the N outputs of the control unit phasers, the input of the synchronization signal which is connected to the output of the synchronization signal digital processor generating the result measured is/BR> where i=1,2,...(MN-1);

MN- the current number of combinations of phase shifts in the phase, sequentially set within a working cycle;

(m-nthe difference of phase shifts in the phase of the m-th, n-th pair of antennas;

Xithe reference ADC output of the receiver when the i-th combination of phase shifts in the phasers.

 

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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

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