Method of determining range to radio source

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering and can be used in radio monitoring systems when solving the problem of determining coordinates of objects concealed-carriers of radio-frequency sources.

EFFECT: technical result is possibility of determining distance to radiation source, mainly stations VHF range of operating outside the horizon, antenna which can be omnidirectional or highly-directional, scanning or fixed.

1 cl, 2 dwg, 1 tbl

 



 

Same patents:

FIELD: radio engineering, communication.

SUBSTANCE: electronic surveillance system calculates estimates X^j,i(k) of status coordinates of detected and tracked radio-frequency sources, based on which results of measuring coordinates Xin,i(k), obtained at the k-th moment in time, are identified with the corresponding radio-frequency sources, wherein for each status coordinate of each detected and tracked radio-frequency source, the method includes determining an interval of values which depends on variance of measurement of Xin,i(k), the variance of the rate of measuring status coordinates X˙j,i(k), as well as the coefficient of proportionality K, the value of which is selected in the range of 1 to 2. The set of intervals on all status coordinates of each radio-frequency source forms a multidimensional gate, where if the measurement result of the status vector Xin(k) at the k-th moment in time falls in said gate, the result is identified with, for example, a specific radio-frequency source. If the measured vector Xin(k) does not fall within any of the gates of the j-th radio-frequency source, where j=1,N¯, a new radio-frequency source with an index N+1 is detected.

EFFECT: high reliability of identifying signals in a multi-target environment.

2 dwg

FIELD: radio engineering, communication.

SUBSTANCE: invention presents a method, a device and computer program product for clocking using the relative behaviour of clocks of individual receiving stations as well as corresponding modelling to derive a time difference of arrival of a signal from a user device which can be used to correct the time difference of arrival based on the modelled clock behaviour and leads to a correct clocking of received user signals, which is applicable to a plurality of pairs of receiving stations and transmitted beacon signals and allows to correct location estimation of a user device.

EFFECT: enabling estimation of the location of a mobile device without the need to synchronise clocks at different receiving stations.

15 cl, 6 dwg

FIELD: radio engineering, communication.

SUBSTANCE: system includes receiving stations (4) for receiving signals transmitted from the spacecraft (6) and a processing station (2) for receiving data from the receiving stations (4), where each receiving station (4) records, during a recording window (8), signals transmitted from the spacecraft (6) and transmits, to the processing station (2), data representing the recorded signals. The recording windows (8) associated with each of the receiving stations (4) are offset and/or have different size with respect to each other. The processing station (2) correlates the recorded signals to estimate the distance difference between the spacecraft (6) and each of a plurality of receiving stations and to estimate the spacecraft (6) position.

EFFECT: avoiding the need to send a reference signal pattern, emission by the spacecraft of any trigger sequence and the need to adapt the spacecraft, and improved estimation of the position of the spacecraft.

22 cl, 10 dwg, 1 tbl

FIELD: radio engineering, communication.

SUBSTANCE: method and system for determining the position of a signal transmitter from the signal arrival time employ separate processing of a signal received by multiple antennae and receiving channels, waiting for characteristic points of the received signal, measuring the time of arrival of characteristic points of the received signal, summation with accumulation to determine the average arithmetic of measured values of the time of arrival of characteristic points of the received signal and calculating the position of the signal transmitter using the average arithmetic of the measured values of the time of arrival of the characteristic points of the received signal as the time of arrival of the signal.

EFFECT: high accuracy and longer range for determining position of a signal transmitter.

3 cl, 4 dwg

FIELD: radio engineering.

SUBSTANCE: measuring base implements the removal of signal amplitudes proportional to the field intensity, as per which the main lobe of antenna beam of radiation sources is restored in linear measure. Determination of the distance to radiation sources is achieved by means of calculation of the ratio of calculated width of radiation source antenna beam in linear units to the width value of antenna beam, which is taken from database, in angular radian measure.

EFFECT: possibility of passive determination of the distance to radiation sources with directional antenna oriented with its main lobe to direction finder antenna; the latter forms together with antennae of additional receiving stations the measuring base the size of which is much smaller than that during implementation of the known time-difference direction determining method, which in its turn allows eliminating communication channels for transfer of received signals to distance calculation station, and as a whole, applying the method on movable direction finder carrying object.

5 dwg

FIELD: physics, measurement.

SUBSTANCE: invention is related to the field of passive radio location and is intended for performance of full-scale tests of pilot samples of passive range-difference system (RDS) in case of absence of one of receiving posts. Substance of suggested method consists in the fact that mutual-correlation measurement of RRS signals time delays received by master and slave receiving posts, and missing slave receiving post is additionally imitated by definition of its location coordinates, which is symmetrical to location of slave receiving post relative to the line "master receiving post - RRS", and as RRS signal received by imitated slave receiving post, signal is used from existing slave receiving post, and then RRS location is defined by full-scale test method.

EFFECT: provides for possibility to evaluate accuracy in detection of radio-wave radiation source (RRS) location by passive RDS in case of one receiving posts in not available in its composition.

2 dwg

FIELD: radar-location.

SUBSTANCE: invention relates to methods and a device for establishing location of a receiver using GPS signals. The invention employs signals of GPS transmitters, which comprise a unique periodically recurring pseudonoise (PN) sequence. The invention is especially useful in non-synchronised systems, for example A-GPS, used in GSM and UMTS systems for mobile telephones. A received signal is stored in a receiver for at least two repetition periods of the PN sequence. A fast Fourier transformation operation is done (FFT), and frequency samples of data are obtained, which are curtailed in response to a hypothetical residual frequency. This cuts the number of the next required calculations and processing time. Correlation series are determined from the curtailed samples and reference frequency samples of the corresponding hypothetical transmission. If conformity is detected, the displacement of code shift is determined. Otherwise the process is repeated with another hypothetical residual frequency. Several similar obtained correlation series can be joined incoherently.

EFFECT: device and method of detecting GPS signals.

25 cl, 13 dwg

The invention relates to electrical engineering and can be used in communication systems to compensate for the delays of the signals received in the radio positioning

The invention relates to electrical engineering and can be used in systems for remote control of nuclear and other explosions, warning of missile launches, monitoring seismic activity

The invention relates to electrical engineering and can be used in systems for remote control of nuclear and other explosions, warning of missile launches, monitoring seismic activity

FIELD: radar-location.

SUBSTANCE: invention relates to methods and a device for establishing location of a receiver using GPS signals. The invention employs signals of GPS transmitters, which comprise a unique periodically recurring pseudonoise (PN) sequence. The invention is especially useful in non-synchronised systems, for example A-GPS, used in GSM and UMTS systems for mobile telephones. A received signal is stored in a receiver for at least two repetition periods of the PN sequence. A fast Fourier transformation operation is done (FFT), and frequency samples of data are obtained, which are curtailed in response to a hypothetical residual frequency. This cuts the number of the next required calculations and processing time. Correlation series are determined from the curtailed samples and reference frequency samples of the corresponding hypothetical transmission. If conformity is detected, the displacement of code shift is determined. Otherwise the process is repeated with another hypothetical residual frequency. Several similar obtained correlation series can be joined incoherently.

EFFECT: device and method of detecting GPS signals.

25 cl, 13 dwg

FIELD: physics, measurement.

SUBSTANCE: invention is related to the field of passive radio location and is intended for performance of full-scale tests of pilot samples of passive range-difference system (RDS) in case of absence of one of receiving posts. Substance of suggested method consists in the fact that mutual-correlation measurement of RRS signals time delays received by master and slave receiving posts, and missing slave receiving post is additionally imitated by definition of its location coordinates, which is symmetrical to location of slave receiving post relative to the line "master receiving post - RRS", and as RRS signal received by imitated slave receiving post, signal is used from existing slave receiving post, and then RRS location is defined by full-scale test method.

EFFECT: provides for possibility to evaluate accuracy in detection of radio-wave radiation source (RRS) location by passive RDS in case of one receiving posts in not available in its composition.

2 dwg

FIELD: radio engineering.

SUBSTANCE: measuring base implements the removal of signal amplitudes proportional to the field intensity, as per which the main lobe of antenna beam of radiation sources is restored in linear measure. Determination of the distance to radiation sources is achieved by means of calculation of the ratio of calculated width of radiation source antenna beam in linear units to the width value of antenna beam, which is taken from database, in angular radian measure.

EFFECT: possibility of passive determination of the distance to radiation sources with directional antenna oriented with its main lobe to direction finder antenna; the latter forms together with antennae of additional receiving stations the measuring base the size of which is much smaller than that during implementation of the known time-difference direction determining method, which in its turn allows eliminating communication channels for transfer of received signals to distance calculation station, and as a whole, applying the method on movable direction finder carrying object.

5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: method and system for determining the position of a signal transmitter from the signal arrival time employ separate processing of a signal received by multiple antennae and receiving channels, waiting for characteristic points of the received signal, measuring the time of arrival of characteristic points of the received signal, summation with accumulation to determine the average arithmetic of measured values of the time of arrival of characteristic points of the received signal and calculating the position of the signal transmitter using the average arithmetic of the measured values of the time of arrival of the characteristic points of the received signal as the time of arrival of the signal.

EFFECT: high accuracy and longer range for determining position of a signal transmitter.

3 cl, 4 dwg

FIELD: radio engineering, communication.

SUBSTANCE: system includes receiving stations (4) for receiving signals transmitted from the spacecraft (6) and a processing station (2) for receiving data from the receiving stations (4), where each receiving station (4) records, during a recording window (8), signals transmitted from the spacecraft (6) and transmits, to the processing station (2), data representing the recorded signals. The recording windows (8) associated with each of the receiving stations (4) are offset and/or have different size with respect to each other. The processing station (2) correlates the recorded signals to estimate the distance difference between the spacecraft (6) and each of a plurality of receiving stations and to estimate the spacecraft (6) position.

EFFECT: avoiding the need to send a reference signal pattern, emission by the spacecraft of any trigger sequence and the need to adapt the spacecraft, and improved estimation of the position of the spacecraft.

22 cl, 10 dwg, 1 tbl

FIELD: radio engineering, communication.

SUBSTANCE: invention presents a method, a device and computer program product for clocking using the relative behaviour of clocks of individual receiving stations as well as corresponding modelling to derive a time difference of arrival of a signal from a user device which can be used to correct the time difference of arrival based on the modelled clock behaviour and leads to a correct clocking of received user signals, which is applicable to a plurality of pairs of receiving stations and transmitted beacon signals and allows to correct location estimation of a user device.

EFFECT: enabling estimation of the location of a mobile device without the need to synchronise clocks at different receiving stations.

15 cl, 6 dwg

FIELD: radio engineering, communication.

SUBSTANCE: electronic surveillance system calculates estimates X^j,i(k) of status coordinates of detected and tracked radio-frequency sources, based on which results of measuring coordinates Xin,i(k), obtained at the k-th moment in time, are identified with the corresponding radio-frequency sources, wherein for each status coordinate of each detected and tracked radio-frequency source, the method includes determining an interval of values which depends on variance of measurement of Xin,i(k), the variance of the rate of measuring status coordinates X˙j,i(k), as well as the coefficient of proportionality K, the value of which is selected in the range of 1 to 2. The set of intervals on all status coordinates of each radio-frequency source forms a multidimensional gate, where if the measurement result of the status vector Xin(k) at the k-th moment in time falls in said gate, the result is identified with, for example, a specific radio-frequency source. If the measured vector Xin(k) does not fall within any of the gates of the j-th radio-frequency source, where j=1,N¯, a new radio-frequency source with an index N+1 is detected.

EFFECT: high reliability of identifying signals in a multi-target environment.

2 dwg

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to radio engineering and can be used in radio monitoring systems when solving the problem of determining coordinates of objects concealed-carriers of radio-frequency sources.

EFFECT: technical result is possibility of determining distance to radiation source, mainly stations VHF range of operating outside the horizon, antenna which can be omnidirectional or highly-directional, scanning or fixed.

1 cl, 2 dwg, 1 tbl

FIELD: wireless communications.

SUBSTANCE: invention relates to navigation and radar systems and can be used to create non-emitting receiver multiposition radar system, using navigation signals of space navigation system for air target illumination purposes. Nature of invention is that when a weak scattered navigation signal is received a powerful feedforward navigation signal is compensated, which in this case plays a role of a structurally determined interference. To this end when receiving an input as a mixture of high-power direct navigation signal, weak navigation signal diffused in the air, and intrinsic noise of the receiver the first procedure is detection of the powerful direct signal, accurate determination of its parameters, the whole input is stored in memory. Further, an exact copy of the direct signal is formed and subtracted from the recorded input implementation. Result contains only the intrinsic noise of the receiver and the weak scattered signal which is detected in a conventional manner. Impact of the main lobe of the correlation function of a not fully compensated direct propagation of the navigation signal is excluded by limiting the range of possible values of the delay in finding the weak scattered signal, as based on the geometry of the spread of direct and indirect signals, the delay of the scattered signal is always greater than that of the direct signal.

EFFECT: achievable technical result is an increase in the probability of correct detection of the navigation signal scattered by the air target.

2 cl, 1 dwg

FIELD: radio electronics.

SUBSTANCE: invention relates to radio electronics and can be used when determining locations of pulse emitters. Technical result is reduction of dimensions of the device while maintaining accuracy of determining range to a pulsed radiation source and the direction to it. Mentioned result is achieved due to that the detection device comprises three widely directed in azimuth antennae, three receivers, two variable delay lines, two units for determining a small time interval, a computer, a unit of two sensors of the reference distance, a secondary processing unit, an indicator.

EFFECT: listed devices are interconnected in a certain manner.

1 cl, 1 dwg

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