Synchronous measurement apparatus based on high precision time reference triggering and method thereof

Abstract

The invention discloses a synchronous measurement apparatus based on high precision time reference triggering and a method thereof. The apparatus is characterized in that a FPGA is connected to a CPU, a GPS module, an acquisition module and a DAC respectively; a down-conversion apparatus, the acquisition module, the FPGA and the CPU are successively connected in series; the DAC, a voltage-controlled oscillator and a local oscillator module are successively connected in series; the voltage-controlled oscillator is connected to a sampling clock and a local oscillator respectively; the local oscillator module is connected to the down-conversion apparatus; and the GPS module is connected to the CPU. The apparatus and the method of the invention have advantages that through using the FPGA and the GPS, high precision measurement time reference is determined, and whole acquisition and processing accesses are synchronized to the GPS; a time error caused by non-synchronization in a measuring instrument is eliminated and high precision synchronization measurement is realized; recording, operation and enforcement are simple; and the apparatus and the method are not limited by a distance among a plurality of synchronous measurement instruments.

Description

technical field [0001] The invention relates to the technical field of synchronous measurement, in particular to a synchronous measurement device and method triggered based on a high-precision time reference. Background technique [0002] Synchronous measurement is conducive to improving measurement accuracy and realizing multi-directional measurement of transient signals. It has important applications in transient signal monitoring, emission source location and other testing. At present, there are three main methods for synchronous measurement of multiple instruments commonly used. [0003] Method 1: Based on the command message, the main controller sends a command to each measuring instrument to start the measurement, and the internal timing realizes the equal-interval synchronous measurement. This method realizes the synchronous measurement operation is simple, easy to realize, the disadvantage is that the synchronous precision is low. The connection distance between th...

AI Technical Summary

Problems solved by technology

There are many ways to use GPS to achieve precise timing. It is difficult for general analog devices to realize frequency and phase detection of pulse-per-second low-frequency signals. It is common to use digital phase-locked loops to synchronize clocks with GPS. The hardware design is complex and difficult to implement.

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