DEMON spectral analysis shaft blade frequency extraction method

• Main Authors: WANG XIAOQING, LI JIN, LIANG HAOQIAN
• Format: Patent
• Language: Chinese; English
• Published: 11.07.2023
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETECTING MASSES OR OBJECTS; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

The invention discloses a DEMON spectral analysis axis and leaf frequency extraction method, belongs to the field of underwater acoustic target recognition, and can be used for passive sonar DEMON spectral analysis, target axis frequency and leaf frequency information extraction and target recognition capability improvement. According to the method, in a preprocessing stage, spatial filtering is performed on received data through beam forming so as to improve a signal-to-noise ratio; background equalization is carried out on the DEMON spectrum through a sorting truncation average method so as to extract a line spectrum more accurately; and a more accurate weight of a line spectrum difference frequency is obtained through an improved greatest common divisor method so as to accurately extract axis frequency and blade frequency information, and the weight of the line spectrum is weighted aiming at the condition that the number of line spectrum elements is insufficient at an unstable moment, so that the data util