Interference suppressor

FIELD: physics.

SUBSTANCE: invention is designed to isolate signals of moving targets against the background of passive interference during the group rearrangement of the carrier frequency of the probing pulses. Interference suppressor includes the first and the second delay units, a weighting coefficient unit, the first and the second complex multipliers, a weight block, a complex adder, a complex conjugation unit, a switching unit, an accuracy unit, a wiring unit and a two-channel switch interconnected in a certain way and carrying out a coherent processing of the original samples. The signal from the moving target and passive interference, significantly exceeding the useful signal in the quadrature phase detectors, is transferred to the video frequency and converted in such a way that the interference residues are compensated.

EFFECT: increasing the signal extraction efficiency of moving targets.

11 dwg

 



 

Same patents:

FIELD: radio engineering, communication.

SUBSTANCE: invention pertains to radio electronics and can be used for frequency selection of signals. The highly selective narrow-band LC-filter comprises two structurally identical band-pass filter links, each consisting of three capacitors and an inductance coil, eleven capacitors, two inductance coils, an input and an output potential terminal and a common bus.

EFFECT: high selectivity of the filter.

6 dwg

FIELD: radio engineering, communication.

SUBSTANCE: tunable band-pass LC-filter comprises a low-pass filter which consists of first, second and third inductance coils, a first capacitor, a band-pass circuit consisting of a fourth inductance coil, a fifth inductance coil, a sixth inductance coil, a second capacitor which is connected to the output of the band-pass circuit, as well as a seventh and eight inductance coil, first and second varicaps, wherein the seventh inductance coil is connected by one terminal to the input potential terminal, and by the second terminal to a common bus, the eight inductance coil is connected to the output of a low-pass filter, the second terminal of which is connected to the output potential terminal of the device, the first varicap is connected in parallel to the first capacitor, the second varicap is connected in parallel to the second capacitor.

EFFECT: high selectivity and broader functional capabilities by enabling frequency tuning.

8 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed device relates to radio electronics and can be used as input selecting circuits of professional-grade radio receivers. The band-pass LC filter with reflection compensation in the stop-band, having multiple cascade-connected links with an identical structure, each having a first inductance coil, the first lead of which is the input of the link, the second lead being connected to a first capacitor, the second lead of which is connected to second and third capacitors, the second lead of the second capacitor is connected to a common bus, the second lead of the third capacitor is connected to a second inductance coil, the second lead of which is the output of the link, wherein the first lead of the first inductance coil of the first link is connected to a fourth capacitor and a third inductance coil, wherein the second lead of a fourth capacitor is connected through a first resistor to the common bus, and the second lead of the third inductance coil is connected through a second resistor to the common bus.

EFFECT: improved standing wave ratio at the input of the band-pass circuit in stop-bands.

4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed device relates to radio electronics and can be used as selectors of professional-grade transceivers. The band-pass LC filter with constant input resistance in stop-bands comprises a first inductance coil, the first lead of which is connected to the input potential terminal of the filter, the second lead of the inductance coil is connected to a first capacitor, the second lead of which is connected to second and third capacitors, the second lead of the third capacitor is connected to a second inductance coil, the second lead of which is connected to fourth and fifth capacitors, the second lead of the fifth capacitor is connected to a third inductance coil, the second lead of which is the potential output of the filter, the second leads of the second and fourth capacitors are connected to a common bus; the device also comprises an additional circuit which consists of a fourth inductance coil, the first lead of which is connected to the input potential terminal of the filter, the fourth inductance coil is connected in parallel to a sixth capacitor, the second lead of the fourth inductance coil is connected to a resistor and a fifth inductance coil, the second lead of which is connected to a seventh capacitor, the second leads of the seventh capacitor and the resistor are connected to the common bus.

EFFECT: improved standing wave ratio at the input of the filter in stop-bands.

6 dwg

FIELD: radio engineering, communication.

SUBSTANCE: highly selective LC bandpass filter has two inductors and eight capacitors which are connected so as to form two links, the first link providing an attenuation terminal lower than the medium frequency and the second link providing an attenuation terminal higher than the medium frequency.

EFFECT: high selectivity of the filter by realising two attenuation terminals at end frequencies and improving squareness of the attenuation characteristics.

5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: multiband tunable LC bandpass filter has two structure-identical bandpass circuits, each consisting of two inductance coils and three capacitors; the input and output of each of the circuits are connected through electronic switches on both inductance coils to an amplifier, eight signal lines, between which, through corresponding electronic switches, are connected corresponding multiple sections of three inductance coils or three capacitors.

EFFECT: high squareness ratio of the amplitude-frequency curve, high level of attenuation in the stop band, broader functional capabilities.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: device includes a low-pass filter consisting of N structurally identical links, each link consisting of an inductance coil, the first lead of which is the input of the link, the second lead is the output of the link; each of the leads of the inductance coil is connected to a capacitor; the second leads of the capacitors are connected to a common bus, wherein two loops are further included, each consisting of parallel-connected capacitor and inductance coil; also additionally included are first, second, third and fourth signal lines; the second signal line is connected to a first group of M electronic switches; the second lead of each electronic switch is connected to a capacitor; the second leads of the capacitors are connected to the first signal line, and the third signal line is connected to a second group of M electronic switches; the second lead of each of the electronic switches is connected to a capacitor; the second leads of the capacitors are connected to the fourth signal line.

EFFECT: providing an electronically tunable rejection band in the operating frequency band.

2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: active piezoelectric band-stop filter has a differential amplifier, two piezoelectric resonators, two resistors and a capacitor.

EFFECT: wider rejection band.

1 dwg

FIELD: radio engineering.

SUBSTANCE: band-pass LC-filter includes the first and the second low-pass filters, the first and the second group of inductance coils, high-pass filter, amplifier, electronic switches and discrete capacitors of variable capacity.

EFFECT: improving operating characteristics of the device, increasing the width of rejection band, increasing the attenuation level in stop band, enlarging the service frequency band and reducing KCB (standing-wave ratio).

1 dwg

FIELD: radio engineering.

SUBSTANCE: device includes common bus, potential input terminal connected to the first output of inductance coil (IC) (2) the second output of which is connected to the first output of capacitor (C) (3) and the first outputs of two input piezoelectric resonators (PR) (4,5) the second outputs of which are connected to inputs of differential amplifier (DA) (7), and the second output of C (3) is connected to common bus. System includes M links; each link includes two output PR (12-19) and one operating amplifier (OA) (8-11). The first output of PR (12-19) is connected in each link to each input of OA, the second outputs of PR are combined in pairs and connected to each other, the second output of PR of odd-numbered links are connected to the first output of DA (7), and the second outputs of PR of even-numbered links are connected to the second output of DA (7). Output of each OA (8-11) is connected to the first output of the first C (20-24), the second output of which is connected to the first output of the second C (21, 25, 29, 33) and to the first output of IC (22, 26, 30, 34), the second output of the second C (21, 25, 29, 33) is connected to common bus, and the second output of IC (22, 26, 30, 34) is connected to separate potential output terminal of the device.

EFFECT: reduction of non-uniformity of amplitude-frequency characteristic in band-pass filters adjacent as to frequency band.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method of processing a packet of radio pulses, based on weighted summation of signals of a packet with weights defined by transmission and reception antenna beam patterns, includes simultaneously performing second weighted summation of signals of a packet with weights defined by the reception antenna beam pattern, making a decision on detecting a false target generated by a synchronous repeater jammer, if the standardised sum after the second weighted summation is greater than after the first weighted summation.

EFFECT: detecting a false target generated by synchronous repeater jamming and a real target.

1 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method for protection from pulsed and synchronous repeater jamming, based on setting a basic detection threshold and an additional higher threshold, the additional threshold is set in each range interval; spatial signal packets are formed from signals exceeding the basic threshold; a signal packet is considered to have been formed from synchronous repeater jamming signals if one or more signals of the signal packet exceed the additional threshold; based on said signal packet, features are determined, from which similar signal packets are detected in the coverage area of the radar station. Said result is also achieved due to that the level of the additional threshold is set based on the allowable probability of receiving the reflected signal from a real target located in said range interval. The feature of the signal packet formed by synchronous repeater jamming is the strength of at least one signal in the signal packet considered interference. Furthermore, the feature of the signal packet formed by synchronous repeater jamming is the number of pulses in the signal packet considered interference. The feature of the signal packet formed by synchronous repeater jamming is also angular coordinates of the beginning and end of the signal packet, as well as the phase difference between signals at spaced reception points in the packet considered interference.

EFFECT: generating features of synchronous repeater jamming and recognition thereof at all ranges.

6 cl, 4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: in the method for protection from pulse interference, which is based on establishing a primary detection threshold and a higher additional threshold, the additional threshold is established in each range interval; features of interference, from which said interference is detected in a radar coverage area, are determined from signals exceeding said threshold. The result according to the first version of the device is achieved due to that a device for protection from pulse interference comprises an antenna, a receiver, a main threshold device, an additional receiving device, an interference selection device, a temporary threshold controller, a synchroniser and an interference recognition device, connected to each other in a certain manner. The result according to the second version of the device is achieved due to that the device for protection from pulse interference comprises an antenna, a receiver, an interference selection device, a second antenna, a second receiver, two main threshold devices with limiters, an additional threshold device with a limiter, two phase detectors, a temporary threshold controller, an interference recognition device and a synchroniser, connected to each other in a certain manner.

EFFECT: generating features of pulse interference and recognition thereof at all range intervals.

8 cl, 4 dwg

FIELD: physics, navigation.

SUBSTANCE: invention relates to radar and can be used in radar stations for protection from active, including pulsed, repeater jamming. In the method of suppressing active jamming, based on receiving radiation of a jamming station using two receiving channels - main and auxiliary, calculating the correlation between signals in said channels, wherein the auxiliary channel receives interference from the jamming station which is reradiated by a relay, the main channel receives interference from the jamming station from the scanned direction, signals in the main channel are delayed until maxim correlation is achieved and automatic interference suppression is carried out. Said result is achieved due to that the system includes a radar station which includes a main receiving channel, an auxiliary receiving channel and a self-compensator; the system also includes a relay which is located within the visibility range of the radar station, wherein the output of the relay is connected to the input of the auxiliary receiving channel; the radar station also includes storage devices for the main receiving channel and the auxiliary receiving channel, a delay setting device, a multichannel delay device, a multichannel correlator and a synchroniser. The listed devices are connected to each other in a certain manner.

EFFECT: compensating for interference received by the main beam of a beam pattern and preserving the signal from a target.

6 cl, 3 dwg

FIELD: physics, navigation.

SUBSTANCE: disclosed engineering solutions relate to radar and can be used in radar stations for protection from synchronous repeater jamming. In the first version of the target recognition method, based on estimation of the radar cross section of the target, upon detecting a relationship between the radar cross section estimate and range, a decision is made that said target is a decoy target generated through synchronous repeater jamming. Said result is achieved due to that in a second version of the target recognition method, based on measuring the power level of a received signal, the power level of detected signals at different ranges is compared; a decision is made that the target is a decoy target generated via synchronous repeater jamming if the ratio of power levels of the signals does not depend on the range or the law of variation of said ratio differs from the fourth power of the ratio of the ranges.

EFFECT: recognising synchronous repeater jamming signals and signals reflected from a target.

3 cl

FIELD: radio engineering, communication.

SUBSTANCE: first recognition method, based on probing space by moving an antenna beam pattern on angular coordinates, includes measuring the ratio of the strength of received signals in two different angular directions of the beam pattern, making a decision on detection of signals reflected from a target or synchronous repeater jamming signals, if the value of said ratio is respectively close to the square of the ratio of function values of the beam pattern or to the ratio of function values of the beam pattern. A second recognition method, based on forming a packet of detected signals as a result of probing while moving the beam pattern on angular coordinates, on the strength of the received signal, at a known value of the level of the beam pattern, two packet size values are calculated: based on an assumption that signals reflected from a target are detected on an assumption that synchronous repeater jamming signals are detected; making a decision on detection of signals reflected from a target or synchronous repeater jamming signals, depending on which of the calculated sizes is close to the packet size of the detected signals.

EFFECT: recognising synchronous repeater jamming signals and signals reflected from a target in single-position radar sets.

2 cl, 2 dwg

FIELD: physics, navigation.

SUBSTANCE: invention relates to the field of radiolocation and is intended for usage in radars for detection of moving targets against the background of reflections from the ground surface. The difference between current and previous radar frames is determined, several previous radar frames are averaged, the obtained difference radar frame is divided into the fields with the given size and in the resulted fields the points of maximum density of brightness marks in the frame is determined iteratively using the special formula.

EFFECT: decrease of probability of identification of false targets and probability of target loss.

4 dwg

FIELD: measurement equipment.

SUBSTANCE: invention refers to measurement equipment and can be used in sensors. Proposed is an add-on for sensor of material with polarimeter provided with search antenna. Material sensor has a housing with antenna surface related to direction of detection, with magnets (4, 4') located opposite to each other with equal poles turned to each other, which poles surfaces are covered with tinned copper layer or oxidized aluminum (13). Magnets (4, 4') and copper layer or aluminium (13) as applied have at least one through hole (5, 5'). Magnets (4, 4') may be located or are located near housing (19, 11) of material sensor stretching perpendicular to antenna surface (12), and they form a space for magnetic field (14) located between magnets (4, 4') before antenna surface (12).

EFFECT: improving detection data reliability.

14 cl, 9 dwg

FIELD: physics, navigation.

SUBSTANCE: invention relates to radar, particularly protection of surveillance radar stations from passive jamming in the form of detected signal accumulations, e.g., in blast regions of surface-to-air missiles. Boundaries of blanking regions of detected signal accumulations are determined during regular surveillance of the zone of the radar station automatically in a "sliding window" with dimensions equal to the dimensions of the trajectory capturing gate, wherein the region of the surveillance zone in the "sliding window" is considered to belong to the blanking region if the density of detected signals calculated therein exceeds a threshold. The method includes, beyond the blanking regions, detecting and tracking trajectories of targets for which the heading velocity does not exceed the given threshold, and the vector of the heading velocity differs from the vertical direction by a value greater than the given threshold.

EFFECT: reducing delay in determining and establishing boundaries of blanking regions of detected signal accumulations, high accuracy of determining said boundaries and more reliable detection of target trajectories beyond the blanking regions.

2 cl, 2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method is implemented by means of several additional receiving channels (ARC), the antennas of which are located in an antenna curtain of the main channel so that their phase centres do not coincide between themselves as to an angle of a place; besides, levels of the main ADP lobes of ARC are established below the level of the main ADP lobe of the main channel at least by k1 times, and above the level of maximum ADP side lobe of this channel at least by k2 times, where k1 and k2 - specified values determined with allowable losses in target detection. During a surveillance process, ADP zones of additional receiving channels control so that at any azimuth and elevation position of the main ADP lobe of the main channel in surveillance zone (SZ) the main ADP lobes of ARC can cover as to angle of the place the specified SZ zone in the whole operating range of radar station as to distance, and as to azimuth - SZ zone including position as to azimuth of the main ADP lobe of the main channel. For each increment as to distance, there measured are levels of signals at the output of the main and each of additional receiving channels, and performance of the specified criterion of availability of passive jamming is checked. If this criterion is performed at least for one of ARC, then, a decision is taken on the fact that a signal at the output of the main channel is passive jamming.

EFFECT: increase of suppression of passive jamming.

4 cl, 3 dwg

FIELD: radiolocation.

SUBSTANCE: device can be used at radiolocation stations with continuous probing signal. Device for detecting moving objects has aerial connected in series with receiver, autocompensator, detector, low frequency filter and solving unit. Device also has additional rejecter filter and one or several compensation channels each of which has aerial connected in series with receiver and rejection filter which has output connected with compensation input of autocompensator. Auotcompensator is brought between receiver of main channel and detector. Additional rejection filter is brought into feedback circuit of autocompensator.

EFFECT: improved autocompensation.

6 dwg

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