Underwater glider platform based cross array line spectrum target passive detection method

An underwater glider, passive detection technology, applied in the direction of radio wave measurement system, measurement device, sound wave re-radiation, etc., to achieve the effect of far passive detection distance

CN109975813AInactive Publication Date: 2019-07-05HARBIN ENG UNIV
4 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-07-05
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to an underwater glider platform based cross array line spectrum target passive detection method. Thus, the problems of close underwater weak line spectrum target detection distances of existing underwater glider platforms can be solved. The processes of the method are as follows: 1, carrying a cross array hydrophone and a compass auxiliary system on an underwater glider so that two sets of segmentation cross-spectrum results can be obtained; 2, obtaining the long integral cross-spectrum superposition result of a virtual array corresponding to each set; 3, judging whethera target exists, measuring target line spectrum frequencies if yes, and showing that a line spectrum target is not detected if no; 4, respectively measuring the subarray azimuth formed by first and third array elements and second and fourth array elements in a cross array relative to the target; 5, obtaining the horizontal azimuth of the x-axis direction of the cross array relative to the target;and 6, obtaining the geodetic coordinate true orientation of the underwater glider platform relative to the target. The method is used for the field of line spectrum target passive detection.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a passive detection method for a line spectrum target. Background technique

[0002] Due to the particularity of the environment in the deep sea, there are strict requirements on the detection system platform to realize the passive detection of underwater acoustic targets and the measurement of the characteristics of marine environmental noise. The deep sea glider platform is a good carrier that can meet the above requirements. There are obvious sound convergence and shadow zone effects in deep-sea sound propagation, and the detection performance of the system is greatly affected by the working depth. Favorable detection. As a new type of underwater detection platform, underwater glider has the characteristics of long underwater working time, variable depth acquisition of acoustic information, strong self-control ability, good concealment, and convenient information transmission. It can be used in underwater acoustic detectio...

Examples

specific Embodiment approach 1

[0035] Specific implementation mode one: a kind of passive detection method of cross-front spectrum target based on underwater glider platform in this embodiment The specific process is as follows:

[0036] like figure 1 As shown, there are obvious sound convergence and shadow zone effects in deep-sea sound propagation, and the depth of target sound convergence areas at different distances is different. The detection performance of the system is greatly affected by the working depth. The detection system must have the ability to collect and record acoustic information at multiple depths. , to ensure that the detection equipment can detect targets located at different distances, the glider platform has the ability to maneuver in the depth direction, and is a good carrier that can meet the above requirements. Therefore, in order to make full use of the deep maneuverability of the glider, the presented method designs a processing method for long integration of the depth measureme...

specific Embodiment approach 2

[0050] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the step 1, a sub-array signal composed of 1 and 3 array elements of the cross array collected in the downlink process of the underwater glider platform is segmented Cross-spectrum calculation to obtain a set of segmented cross-spectrum results;

[0051] Segmented cross-spectrum calculations are performed on a sub-array signal composed of 2 and 4 elements of the cross array collected during the downlink process of the underwater glider platform, and a group of segmented cross-spectrum results are obtained;

[0052] The specific process is:

[0053] Process such as image 3 As shown, 1, 2, 3, and 4 in the figure represent the array element numbers.

[0054] During the downlink process of the underwater glider platform, the signals received by the 1st and 3rd elements of the cross array are collected x 1 (t), x 3 (t);

[0055] During the downlink process of the unde...

specific Embodiment approach 3

[0060] Specific embodiment three: what this embodiment is different from specific embodiment one or two is that, in described step 3, carry out line spectrum detection to cross matrix average amplitude spectrum, specific way is:

[0061] The method of two-way α filter line spectrum detection is used to detect the line spectrum of the average amplitude spectrum of the cross array, such as Figure 5 As shown, the process is:

[0062] Firstly, perform two-way α filtering on the average amplitude spectrum of the cross array to extract the background of the continuous spectrum. The process is as follows:

[0063] The specific implementation of bidirectional alpha filtering is as follows Image 6 shown.

[0064] The continuous spectrum background is extracted according to the two-way α filter formula, and the calculation formula of the two-way α filter is:

[0065] Y(k)=Y(k-1)+α[X(k)-X(k-1)]

[0066] In the formula, α is the filter coefficient; X(k) represents the input sequence...