4 results about "Matched field" patented technology

The application discloses a kind of based on trajectory poisson multi bernoulli hybrid filtering coherent matching field tracking method and system, belong to underwater acoustic technical field.Extract local peak value from the multiple frame ambiguity surface obtained from coherent matching field processing and carry out clustering, construct three-dimensional measurement set including target distance, depth and radial velocity estimation information;On this basis, establish matching field trajectory state space model, utilize trajectory poisson multi bernoulli hybrid filter in trajectory space to carry out state prediction, and update predicted result in combination with three-dimensional measurement set;Realize data association based on the likelihood consistency of distance, depth and radial velocity, to complete target trajectory estimation.The application is extracted to the peak value of three-dimensional ambiguity surface by clustering processing, effectively reduces the large number of highly similar redundant trajectories near real trajectory, reduces the calculation burden of algorithm and the uncertainty of data association.The matching field tracking problem under low signal-to-noise ratio environment is solved.

The application discloses a kind of low-frequency sound source three-dimensional passive positioning methods of deep-sea small aperture array, belong to ocean engineering, underwater acoustic engineering, array signal processing and sonar technology technical field, comprising the following steps: S1, setting small aperture array initial parameter;S2, small aperture array carries out super directivity azimuth estimation;S3, using small aperture array carries out the matching field positioning of super directivity;S4, using S2 and S3 estimation result, using small aperture array beam output result estimation target depth;The application breaks through the limitation that conventional scalar array cannot simultaneously obtain target azimuth, distance and depth information under the condition of smaller array aperture, can simultaneously obtain target azimuth and distance information with smaller aperture, and obtains target depth information according to known target azimuth and distance information, and has good azimuth estimation performance, and is convenient to lay and recover, more widely applicable, and lower cost.

The invention discloses a coherent matching field tracking method and system based on trajectory Poisson multi-Bernoulli hybrid filtering, and belongs to the technical field of underwater sound. Local peak values are extracted from a multi-frame ambiguity surface obtained through coherent matching field processing, clustering is carried out, and a three-dimensional measurement set containing target distance, depth and radial speed estimation information is constructed; on this basis, a matching field trajectory state space model is established, a trajectory Poisson-Bernoulli hybrid filter is utilized to perform state prediction in a trajectory space, and a prediction result is updated in combination with a three-dimensional measurement set; and realizing data association based on the likelihood consistency of the distance, the depth and the radial speed so as to complete target trajectory estimation. According to the method, clustering processing is carried out on the peak values extracted from the three-dimensional ambiguity surface, a large number of highly similar redundant trajectories near a real trajectory are effectively reduced, and the calculation burden of an algorithm and the uncertainty of data association are reduced. The method aims at a matching field tracking problem in a low signal-to-noise ratio environment.

The present application relates to underwater acoustic signal processing and sonar system parameter calibration technical field, especially a kind of active sonar pitch angle calculation method based on reverberation signal, for the physical mismatch of existing attitude sensor direct measurement, matching field type method lacks the technical blank with the pitch angle of sonar itself as inversion target, unknown pitch angle is regarded as inversion variable, through the joint forward of transmission-dispersion sound field propagation model and interface scattering model under different hypothetical pitch angle Theoretical reverberation signal is matched with the normalized cross-correlation of measured reverberation signal, the absolute value of the peak value of correlation coefficient corresponding angle is extracted, and the positive and negative signs of the comparison determination of the early interface reverberation arrival order obtained by envelope detection and the geometric theoretical arrival time are combined, and finally the real working pitch angle of sonar system is obtained.The method does not need additional hardware, and the pointing error caused by installation deviation and deformation can be eliminated using conventional reverberation data, and the inversion precision is high and the engineering practicability is strong.