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GPS clock synchronization method for distributed acoustic positioning system

A GPS clock, underwater acoustic positioning technology, applied in time division multiplexing systems, synchronization, positioning and other directions, can solve problems such as low power consumption that does not meet the buoy, high power consumption of high-precision clocks, and inappropriate synchronization periods.

Inactive Publication Date: 2010-09-15
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

[0005] Using a high-precision clock inside each buoy can meet this requirement, but the high-precision clock consumes a lot of power, which does not meet the low power consumption requirements of the buoy, and the price is relatively expensive.
[0006] The second pulse signal of GPS is a standard signal, and its error is only about 200ns, but the pulse width and period of the second pulse signal are fixed. When measuring a faster or slower target, the synchronization period of 1 second is not suitable. suitable

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  • GPS clock synchronization method for distributed acoustic positioning system
  • GPS clock synchronization method for distributed acoustic positioning system
  • GPS clock synchronization method for distributed acoustic positioning system

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Embodiment Construction

[0040] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0041] figure 1 Schematic diagram of the application of GPS time synchronization device in underwater acoustic positioning system.

[0042] The distributed underwater acoustic positioning system has several nodes, and the data measured by each node should be synchronized in time, so each node needs to be equipped with a GPS time synchronization device. The main control computer (1) sends the synchronization start time and the preset value (7) of the synchronization pulse cycle and pulse width to each node through the radio communication chain (3). After each node receives the preset value sent by the main control computer (1), it compares the preset value with the GPS standard time (8) in real time.

[0043] figure 2 It is a block diagram of the GPS time synchronization device.

[0044] After the node receives the synchronization start time and the synchroniz...

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Abstract

The invention provides a GPS clock synchronization method for a distributed acoustic positioning system, which comprises the steps of: A. when GPS standard time is same as the preset synchronization time, synchronizing by a GPS second pulse triggering system, i.e. establishing time synchronization; B. after the synchronization is begun, according to preset clockc cycle and pulse width, generating a clock signal clkl by common crystal oscillation frequency division, and then generating synchronization pulses with corresponding pulse period and pulse width by clkl frequency division in a synchronizer; and C. when the number of the synchronization pulses reaches the preset number, triggering a GPS second pulse signal to generate a forced zero clearing signal so that all counters count again to eliminate cumulative errors caused by inaccurate common crystal oscillation. The invention is used in the distributed acoustic positioning system and can realize high-precise synchronization among all nodes, less power consumption and low cost.

Description

technical field [0001] The invention relates to time application technology and underwater acoustic measurement technology, in particular to a time synchronization method in an underwater acoustic buoy measurement system. Background technique [0002] Time application technology includes two aspects: the establishment of time synchronization and the maintenance of time synchronization. The establishment of time synchronization means that the user aligns the local clock with a certain standard clock, and the maintenance of time synchronization relies on the accurate frequency standard to maintain the local clock, so that the error between the local clock and the standard clock is as small as possible. [0003] GPS is a satellite-based all-weather passive navigation system. Due to its high precision, economical and simple use, etc., it has become the most widely used positioning and timing system. [0004] When using the multi-buoy method to accurately measure underwater targ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06G01S5/18G04G7/00
Inventor 梁国龙嵇建飞王燕付进张光普
Owner HARBIN ENG UNIV
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