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Acoustic synchronization method in distributed underwater acoustic network passive positioning system

An underwater acoustic network and passive positioning technology, which is applied in time division multiplexing systems, positioning, radio wave measurement systems, etc., can solve the problems of positioning receiving time delay error and positioning accuracy decline, and improve receiving accuracy and cost Low, improve the effect of positioning results

Inactive Publication Date: 2018-11-30
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a clock synchronization method in a communication network, aiming to solve the problem of positioning reception delay error caused by the clock error caused by clock crystal oscillator synchronization in the underwater Tongxi network, resulting in a decrease in positioning accuracy

Method used

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  • Acoustic synchronization method in distributed underwater acoustic network passive positioning system
  • Acoustic synchronization method in distributed underwater acoustic network passive positioning system
  • Acoustic synchronization method in distributed underwater acoustic network passive positioning system

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Embodiment 1

[0022] The purpose of the present invention is to provide a clock synchronization method in a communication network, aiming to solve the problem of positioning reception delay error caused by the clock error caused by clock crystal oscillator synchronization in the underwater Tongxi network, resulting in a decrease in positioning accuracy . The present invention proposes a method based on acoustic communication between network nodes, through the interaction between network nodes of a certain protocol to realize synchronous transmission of positioning signals between networks. This project is called acoustic synchronization.

[0023] The method of acoustic synchronization is to determine the acoustic propagation delay between fixed nodes during the acoustic communication process between fixed nodes, and calculate the communication delay difference between each node through the communication between the fixed node and each sub-node. Then take a fixed node as the reference point,...

Embodiment 2

[0029] A distributed underwater acoustic positioning system according to an embodiment of the present invention can be divided into fixed nodes and mobile nodes to be positioned.

[0030] Such as figure 1 As shown, the fixed node is further divided into a master node A and at least two slave nodes B and C, which are used to locate the underwater mobile node D.

[0031] Step 1: Before the system starts working, when deploying fixed nodes A, B, and C, first use GPS equipment to record the GPS latitude and longitude of each fixed node;

[0032] Step 2: Sound velocity measurement process: Send signals to nodes B and C in sequence between fixed points, measure the sound propagation time from the sub-node itself to the master node, and calculate the distance from each slave node to the master node according to the sound propagation time and the distance obtained in step 1 The sound velocity value of the node;

[0033] Step 3: Delay measurement process: Node A enters a standby stat...

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Abstract

The invention discloses a synchronization method among distributed network nodes in an acoustic communication mode and belongs to the field of underwater acoustic communication. According to the method, acoustic propagation delay among fixed nodes is obtained through utilization of an acoustic communication process among the fixed nodes of a network; a clock of a master node in the network is taken as reference; a synchronization signal of the master node is taken as an alignment signal; time difference information from current signal transmitting time to positioning signal transmitting time is carried in the synchronization signal; and after sub-nodes receive the synchronization signal, time information in the synchronization signal is demodulated, the propagation delay between the masternode and the sub-nodes is subtracted by the time, and the time of transmitting positioning signals by the sub-nodes can be obtained, so the purpose of synchronously transmitting the positioning signals in the whole network is achieved. The method is characterized by that real-time high-precision synchronization of the whole system is realized in a positioning process, power consumption is low, and cost is low.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an acoustic synchronization method in a passive positioning system based on a distributed underwater acoustic network. Background technique [0002] The conventional passive positioning method requires time synchronization between the sending end (fixed node) and the receiving end (mobile node) of the positioning signal, and the distance between the two parties is obtained through one-way acoustic emission. Due to the limitation of power consumption, fixed network nodes can only use low-stability clocks, so long-term underwater work will cause clock skew and time instability. Before positioning at the same time, it is necessary for the mobile node to provide precise timing to the fixed node. This solution is not only difficult to implement, but also requires the mobile node to actively initiate communication during the timing process, which loses the meaning of p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06G01S5/18
Inventor 乔钢周锋孙宗鑫刘凇佐聂东虎赵晨
Owner HARBIN ENG UNIV
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