A method and system for detecting and locating a falling container based on time-frequency addressing

Abstract

The invention discloses a submerged container detecting and locating method and system based on time-frequency addressing. The method comprises the steps that firstly, water surface detection nodes are put; secondly, address codes of submerged containers to be detected are determined, the water surface detection nodes send two frequency modulation pulse submarine sound signals according to the sequence of the address codes, and the address codes correspond to the two frequency modulation pulse signals and the time interval between the two frequency modulation pulse signals; thirdly, a submarine sound beacon conducts addressing according to the corresponding address codes, whether the frequencies of the first pulse signal and the second pulse signal which are received at present and the time interval between the two pulse signals are matched with the address codes or not is judged, if yes, addressing success is confirmed, a location response submarine sound signal is sent, and if not, addressing failure is confirmed, and a dormant program is executed; fourthly, the water surface detection nodes receive the location response submarine sound signal and finish detecting and locating of the submerged containers with confirmed addressing success; fifthly, detecting and locating of all submerged containers are finished. The submerged container detecting and locating method and system are suitable for detection and location of a plurality of submerged containers in a large water area.

Description

technical field [0001] The invention relates to time-frequency addressing technology, in particular to a method and system applicable to the detection and positioning of a plurality of falling containers in a large-scale water area based on underwater acoustic signal processing. Background technique [0002] With the popularization and use of containers, dangerous goods often appear in the form of containers in water transportation. Due to adverse weather conditions, unfavorable channel conditions, dense ship traffic flow distribution, and operational errors by ship drivers, etc., accidents of containers falling into the water will occur. In order to avoid the damage of dangerous goods to the marine environment, it is necessary to salvage the dangerous goods containers that have fallen into the water in time. The detection and positioning of the falling container is the premise of the salvage work. The underwater acoustic signal processing technology is often used to detect...

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Problems solved by technology

[0004] However, it needs to be explained that since the bandwidth of the underwater acoustic channel and the working bandwidth of the low-cost underwater acoustic transducer are very narrow, and considering the guard interval between different communication frequencies, the frequency division multiple access technology can be used for underwater acoustic beacons. The number of communication frequencies is small, which cannot meet the needs of addressing a large number of dangerous goods containers. Therefore, it is necessary to further solve the above-mentioned problems in the underwater acoustic beacon addressing technology of the above-mentioned detection and positioning technology for dangerous goods containers that have fallen into the water based on underwater acoustic signal processing. Insufficient to overcome the deficiencies of existing technologies

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