Device for acquiring signal triggering moment value

Abstract

The invention provides a device for acquiring a signal triggering moment value. The device uses a GPS (global positioning system) component with long-term stability and high precision and a crystal oscillator with short-time stability and low cost. Pulse per second PPS outputted by the GPS component is subdivided through a programmable logic device, a frequency value outputted by the crystal oscillator is updated, so second-precise time of the arrival moment of a triggering signal is obtained, and NMEA information outputted by the GPS component is analyzed in real time to obtain corresponding information of year, month, day, hour, minute and second of triggering moment and satellite positioning state of the GPS component. Obtained information of year, month, day, hour, minute and second and the second-precise time of the arrival moment of the triggering signal are combined, and then an high-precision absolute time value of triggering moment of a distributed field test signal is provided. The device has the advantages of high triggering precision, freedom of periodic calibration, low cost, quick response speed and the like, is applicable to a distributed test system for testing field signals like sound field, pressure field and temperature field.

Description

technical field [0001] The invention belongs to the technical field of perception and measurement and control, and in particular relates to a signal trigger time value acquisition device. Background technique [0002] The distributed field signal test system needs to record the status of each measuring point in the system and the arrival time of the test signal, and the test results of the entire test system can be obtained through the accurate time information obtained by each measuring point. The higher the time accuracy obtained when the signal is triggered, the more conducive to the comprehensive analysis of the field signal and the higher the test accuracy. [0003] At present, there are mainly two ways to obtain high-precision trigger time in the distributed field signal test system: one is to introduce the standard time reference into each test node of the distributed test system to achieve absolute time synchronization among the test nodes; The synchronization algor...

AI Technical Summary

Problems solved by technology

The accuracy of atomic clocks is much higher than that of GPS, but they are costly and bulky, and they are often used as calibration equipment. At present, there is no miniaturized product for distributed testing. GPS is widely used in the market and has achieved miniaturization and low cost. , no need for regular calibration, easy to use

Common low-cost GPS devices can provide long-term stable second pulse signal PPS, but the time resolution they can provide is limited

[0005] A synchronization algorithm is used in the distributed test system, such as the network time synchronization algorithm of the wireless sensor network, so that the local time of each test node is stabilized on a relatively synchronized time axis, but the time synchronization algorithm is more complicated, and the synchronization accuracy can reach several us. For field signals with faster propagation speed, the test accuracy will be affected

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