METHOD FOR FORMATION OF CARDIOID RESPONSE OF A WIDE BAND GIDROACUSTICAL RECEIVER CHANNEL FOR AN UNINHABITED UNDERWATER APPARATUS Russian patent published in 2017 - IPC G01S15/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to methods for solving the problem of broadband reception the narrow-band (relative to the reception band frequency) acoustic signals with a priori unknown center frequency of the spectrum by a compact receiver cardioid (CNs) in a wide range of working angles amid interfering noise centered on corner. The main result achieved when using the proposed method is a significant increase in depth of the dip in the characteristic of the receiver orientation in a direction of interfering noise in the operating band of the reception channel frequencies. Additional results include: reduction in requirements for the identity of the active elements of the characteristics that make up a cardioid receiver, reducing the requirements for receiver assembly in the manufacture precision and simplification of the whole procedure of tuning the receiver while maintaining a large depth of the dip in the CN. The method is based on splitting by the procedure complex FFT receiving broad band signals at the output of the first and second elements forming the cardioid receiver into a plurality of narrowband channels. When setting up the receiver for the direction in which the failure should be provided in the CN, formed a table containing the complex coefficients for the center frequency of each narrowband channel, equal treatment of complex values of the output signals of the first and second channels. When a signal of the failure XH multiplication received second channel signal to the corresponding complex factor ensures precise alignment of the amplitude and phase cardioid receiver outputs of the first and second channels for the center frequency of each narrow frequency band, which is divided into the source a wide range of operating frequencies.

EFFECT: resulting in a cardioid XH shaper for calculating difference values of output signals of the first and second channels is achieved a substantial increase in depth of the dip at any frequency XH broadband reception channel.

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