Underwater wireless time frequency comparison method and system
A time-frequency, wireless technology, applied in the field of communication
Active Publication Date: 2021-05-07
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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[0004] The purpose of the present invention is to provide an underwater wireless time-frequency comparison method and system to solve the problem of time-frequency comparison of multiple underwater nodes in underwater space
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description and claims, the advantages and features of the present invention will be more clear. It should be noted that all the drawings are in very simplified form and inaccurate scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
[0036] It should be noted that, in order to clearly illustrate the content of the present invention, the present invention specifically cites multiple embodiments to further explain different implementation modes of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity of description, the content mentioned in the previous embodiment is often omitted in the latter embodiment, therefore, the content not mentioned in the later embo...
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The invention discloses an underwater wireless time-frequency comparison method and system. The method comprises the steps: providing a first underwater node and a second underwater node, and enabling the first underwater node to generate a time-frequency integrated signal through the modulation processing of a time signal and a frequency signal generated by a time-frequency source of the first underwater node; modulating blue-green laser by using the time-frequency integrated signal, and performing beam collimation processing on the modulated blue-green laser to obtain a laser signal bearing standard time frequency; the first underwater node transmits a laser signal bearing a standard time frequency to the second underwater node, and performs detection receiving and signal demodulation at the same time; and the first underwater node performs time comparison solution and frequency comparison solution according to the time frequency source of the first underwater node and the received time frequency signal of the second underwater node to obtain a comparison result. The method has the advantages that the method is easy to implement, optical signals between the two nodes are compared through the wireless optical communication link, and therefore comparison of standard time frequency signals is completed.
Description
technical field [0001] The invention belongs to the technical field of communication, in particular to an underwater wireless time-frequency comparison method and system. Background technique [0002] In recent years, unmanned and miniaturized mobile devices such as underwater sensors and underwater vehicles, with their good flexibility and superior cost performance, have been used in seabed mining detection, fishery resource research, deep sea exploration and rescue, and even marine military applications. Many technical fields play an increasing role. When the system uses multiple devices to network and realize collaborative work, the time synchronization and frequency transfer technology between multiple devices has gradually become an unavoidable technical problem. [0003] Different from the atmospheric environment, underwater space has its unique characteristics, and electromagnetic waves attenuate greatly in water. The underwater wireless time synchronization method ...
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IPC IPC(8): H04B10/50H04B10/60H04B13/02
CPCH04B10/503H04B10/60H04B13/02
Inventor 杨文哲杨宏雷张升康王海峰王学运
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT