Method and system for detecting underwater objects based on frequency spectrum cognition and segmented frequency-hopping frequency modulation

A detection system and detection method technology, which is applied in the direction of radio wave measurement system, measurement device, sound wave reradiation, etc., to achieve the effect of avoiding calculation, improving work efficiency and improving robustness

Inactive Publication Date: 2014-05-07
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The transmitting end generates chirp signals sequentially from high to low according to the frequency bands in the table and is sent by the sending probe

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  • Method and system for detecting underwater objects based on frequency spectrum cognition and segmented frequency-hopping frequency modulation
  • Method and system for detecting underwater objects based on frequency spectrum cognition and segmented frequency-hopping frequency modulation
  • Method and system for detecting underwater objects based on frequency spectrum cognition and segmented frequency-hopping frequency modulation

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope and implementation methods of the present invention are not limited thereto.

[0045] The structural diagram of the underwater object detection system based on spectrum cognition and segmental frequency hopping is as follows: figure 1 As shown, it includes the following four parts: control center (including two parts of emission control and reception control), detection device, channel model and detection target. The connection relationship and signal transmission relationship of each part are shown in the figure, of which 10 is the control In the center, 110 is the emission control, 1101 is the spectrum listener, 1102 is the band-pass filter (BPF), 1103 is the parallel / serial converter, 1104 is the squarer, 1105 is the integrator, 1106 is the decision device, 1107 is the signal Generator, 1108 is LFM modulator, 1109 is frequency hopping modula...

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Abstract

The invention discloses a method and a system for detecting underwater objects based on frequency spectrum cognition and segmented frequency-hopping frequency modulation. The system comprises a control center and a detector. The control center comprises an emission control sub-system and a receiving control sub-system. The two sub-systems are both connected with the detector. A cognition method of active-passive combination is used, and a frequency spectrum monitor passively monitors underwater frequency bands to acquire a frequency band table. An emission end generates linear frequency-modulated signals according to frequency bands in the frequency spectrum table from high to low sequentially, and the signals are sent by a sending probe. A receiver can regulate emission parameters such as emission power and modulation parameter according to quality of echo signals after receiving the echo signals to realize more accurate detection. Sending parameters can be regulated in real time according to condition of channel quality, high-attenuation and strong multipath interferences can be resisted, and accurate and reliable underwater detection can be achieved.

Description

technical field [0001] The invention relates to the technical field of underwater detection, in particular to a short-distance underwater object detection method and system based on spectrum recognition and segmented frequency hopping. Background technique [0002] Since the beginning of the 21st century, human beings have paid more and more attention to the research and development of the ocean in terms of economy, military and environmental protection. Therefore, the detection of underwater targets is a problem that we often encounter in the process of developing and utilizing the ocean. It refers to the process of detecting, observing and identifying underwater targets by means of acoustics, optics and electromagnetics, using sonar, underwater television and magnetic detectors and other equipment. [0003] Different from the target detection on land, the underwater detection signal propagation channel is much more complicated than the various wired and wireless channels o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S15/02G01S15/93
Inventor 韦岗张琪杨萃陈建量马丽红
Owner SOUTH CHINA UNIV OF TECH
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