METHOD FOR DETERMINING DIRECTIONS AND DISTANCE TO SIGNAL SOURCE Russian patent published in 2017 - IPC G01S3/80 

FIELD: measuring equipment.

SUBSTANCE: arrival time of electromagnetic radiation (EMR) is registered to a single-point observation station with two infrasound registration points, as well as the infrasound arrival time to two recording points is registered, and for each registration point the difference is determined in the arrival time of the EMR and infrasound. In addition, before the infrasound arrives at the two registration points, the magnetic components of the EMR signal are recorded by two mutually perpendicular horizontal planes in the horizontal plane, with magnetic antennas oriented with the maxima of the directional diagrams, respectively, to the North-South and West-East directions. The azimuth signals are determined from the ratio of the magnetic antenna signals and the approximate distance to the source of signals from the change in the spectrum of the EMR signal as a function of the distance traveled by the EMR. For which the total range of the signals of the two magnetic antennas is determined, the upper and lower frequency spectrum and the amplitudes of the signals at these frequencies are defined, the ratio of upper frequency to the lower frequency spectrum and the ratio of the amplitude of the lower frequency to the amplitude of the upper frequency spectrum are determined, according to the obtained relationship, the lower frequency spectrum, the speed of light and the azimuth to determine the approximate range to the source of electromagnetic radiation and its location, an approximate location for each point is determined, the angle of signal arrival is checked between the direction to the signal source and the straight line connecting the point of registration, an approximate distance is determined to the signal source and the given speed of infrasound the expected time interval of arrival of the infrasound for each point is determined incorporating the error of the specified speed of infrasound and determining the approximate range and stopping the signal analasys until the expected time intervals of arrival of the infrasound, and within the expected time interval after the infrasound arrival and determining the time difference of the arrival of EMR and infrasound for each registration point, the angle-of-arrival signals, the known distance between the registration points and the time differences of the arrival of EMR and infrasound for each point registration specify the speed of infrasound during the passage of the signal time differences of the arrival of EMR and infrasound for each registration point and the updated velocity of the infrasound during the passage of signals specify the value range to the signal source, and the azimuth and elevation specified value range specify the location of the source signals.

EFFECT: reducing its usage error at the single-point observation station and increasing the noise-proof feature in the presence of the interfering signals, coming during the infrasound transmission the distance from the signal source upto the observation point.

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