阅读说明：本技术 一种多功能近震源震动记录系统及其采集记录方法 (Multifunctional near-seismic source vibration recording system and acquisition recording method thereof ) 是由 俞小露 杨阳 胡鑫 陈静 于 2020-12-21 设计创作，主要内容包括：本发明公开了一种多功能近震源震动记录系统及其采集记录方法,多功能近震源震动记录系统包括有上位机、多功能近震源震动记录仪器和主动震源,多功能近震源震动记录仪器通过电缆与主动震源连接；多功能近震源震动记录仪器包括有数据整理模块,分别与数据整理模块连接的无线通信模块、GPS模块、时钟芯片、采集参数配置模块、触发信号识别模块和数据采集模块；上位机与无线通信模块进行无线通信连接。本发明满足精确的触发时间记录,具有多种触发方式识别和震动源扫频信号采集功能。(The invention discloses a multifunctional near-seismic source vibration recording system and an acquisition recording method thereof, wherein the multifunctional near-seismic source vibration recording system comprises an upper computer, a multifunctional near-seismic source vibration recording instrument and an active seismic source, and the multifunctional near-seismic source vibration recording instrument is connected with the active seismic source through a cable; the multifunctional near-seismic source vibration recording instrument comprises a data sorting module, a wireless communication module, a GPS module, a clock chip, an acquisition parameter configuration module, a trigger signal identification module and a data acquisition module, wherein the wireless communication module, the GPS module, the clock chip, the acquisition parameter configuration module, the trigger signal identification module and the data acquisition module are respectively connected with the data sorting module; the upper computer is in wireless communication connection with the wireless communication module. The invention meets the requirement of accurate trigger time recording and has the functions of multiple trigger mode identification and vibration source frequency sweep signal acquisition.)

1. The utility model provides a multi-functional near-source vibration recording system which characterized in that: the multifunctional near-seismic source vibration recording instrument is connected with the active seismic source through a cable; the multifunctional near-seismic source vibration recording instrument comprises a data sorting module, a wireless communication module, a GPS module, a clock chip, an acquisition parameter configuration module, a trigger signal identification module and a data acquisition module, wherein the wireless communication module, the GPS module, the clock chip, the acquisition parameter configuration module, the trigger signal identification module and the data acquisition module are respectively connected with the data sorting module; the upper computer is in wireless communication connection with the wireless communication module, the GPS module receives GPS time signals and pulse per second, the clock chip corrects the clock chip according to the GPS time signals and the pulse per second, the acquisition parameter configuration module sets acquisition parameters, the trigger signal identification module detects and identifies the trigger signal input by the active seismic source, the data acquisition module is used for acquiring seismic wave data, and the data processing module packs the acquired seismic wave data and the current GPS timestamp together to form a data frame.

2. The multi-functional near-source seismic recording system of claim 1, wherein: the clock chip is a constant temperature crystal oscillator clock connected to the data sorting module, and the data sorting module corrects the frequency offset of the constant temperature crystal oscillator clock through the GPS second pulse received by the GPS module to acquire an accurate time calibration RTC real-time clock.

3. The acquisition and recording method of the multifunctional near-source vibration recording system according to claim 1, wherein the acquisition and recording method comprises the following steps: the method specifically comprises the following steps:

(1) arranging the multifunctional near-seismic source vibration recording instrument and the active seismic source well according to the topological structure required by the operation;

(2) powering on the multifunctional near-seismic source vibration recording instrument, carrying out wireless communication connection with an upper computer, and configuring acquisition parameters through an acquisition parameter configuration module;

(3) after the multifunctional near-seismic source vibration recording instrument successfully receives the GPS signal through the GPS module, the GPS time locking and the clock calibration are completed, and the reference timestamp is uploaded;

(4) the active seismic source is excited, a trigger signal identification module of the multifunctional near-seismic source vibration recording instrument identifies a trigger signal, and a data acquisition module starts to acquire a sweep frequency signal given by the active seismic source and uploads the sweep frequency signal to an upper computer in real time;

(5) and after the upper computer receives the effective data frame, drawing and storing the effective data frame.

4. The acquisition recording method according to claim 3, characterized in that: the acquisition parameters comprise sampling frequency, sampling gain, sampling duration and filter parameters.

5. The acquisition recording method according to claim 3, characterized in that: after the trigger signal identification module of the multifunctional near-seismic source vibration recording instrument identifies the trigger signal, the data sorting module stores the GPS moment at the moment, uploads the GPS moment to the upper computer, and uploads a sweep frequency signal acquired by the data acquisition module within a sampling duration set after the GPS moment to the upper computer.

6. The acquisition recording method according to claim 3, characterized in that: the specific steps of the GPS time locking and the clock calibration are as follows: the frequency deviation of the constant temperature crystal oscillator clock is corrected through the GPS second pulse received by the GPS module, when the first GPS second pulse arrives, a timer of the constant temperature crystal oscillator clock is started, when each next second pulse arrives, the value of the timer is compared with the previous second pulse, the difference value is judged, and the constant temperature crystal oscillator clock is adjusted and corrected.

Technical Field

The invention relates to the field of geophysical exploration, in particular to a multifunctional near-seismic source vibration recording system and an acquisition and recording method thereof.

Background

Geophysical exploration is used for detecting geological conditions such as stratum lithology, geological structure and the like by researching and observing changes of various geophysical fields, and can be divided into engineering geological exploration in the fields of water conservancy, electric power, railways, bridges, urban construction, traffic and the like and resource exploration in the fields of petroleum, coal fields, uranium mines, underground water and the like according to different detection targets.

The node type seismic exploration instrument has the advantages of simple structure, light weight, convenience in construction and the like, and is widely applied to the field of geophysical exploration. During application of the node type seismic exploration instrument, a seismic source is required to be matched. In active source seismic exploration, accurate recording of the seismic source starting time is crucial to later data processing, and a special instrument is required for recording.

Active sources commonly used are source vehicles and explosives. The indication of the starting time of the seismic source vehicle is generally a pulse signal, and a sweep frequency signal is provided at the same time for relevant operation during later data processing; when using an explosive source, the start time indication is typically a short circuit signal, while the time confirmation is performed in conjunction with the near field detector data.

Disclosure of Invention

The invention aims to solve the technical problem of providing a multifunctional near-vibration source vibration recording system and an acquisition recording method thereof, which meet the requirement of accurate trigger time recording and have the functions of multiple trigger mode identification and vibration source frequency sweep signal acquisition.

The technical scheme of the invention is as follows:

a multifunctional near-seismic source vibration recording system comprises an upper computer, a multifunctional near-seismic source vibration recording instrument and an active seismic source, wherein the multifunctional near-seismic source vibration recording instrument is connected with the active seismic source through a cable; the multifunctional near-seismic source vibration recording instrument comprises a data sorting module, a wireless communication module, a GPS module, a clock chip, an acquisition parameter configuration module, a trigger signal identification module and a data acquisition module, wherein the wireless communication module, the GPS module, the clock chip, the acquisition parameter configuration module, the trigger signal identification module and the data acquisition module are respectively connected with the data sorting module; the upper computer is in wireless communication connection with the wireless communication module, the GPS module receives GPS time signals and pulse per second, the clock chip corrects the clock chip according to the GPS time signals and the pulse per second, the acquisition parameter configuration module sets acquisition parameters, the trigger signal identification module detects and identifies the trigger signal input by the active seismic source, the data acquisition module is used for acquiring seismic wave data, and the data processing module packs the acquired seismic wave data and the current GPS timestamp together to form a data frame.

The clock chip is a constant temperature crystal oscillator clock connected to the data sorting module, and the data sorting module corrects the frequency offset of the constant temperature crystal oscillator clock through the GPS second pulse received by the GPS module to acquire an accurate time calibration RTC real-time clock.

A multifunctional near-seismic source vibration acquisition recording method specifically comprises the following steps:

(1) arranging the multifunctional near-seismic source vibration recording instrument and the active seismic source well according to the topological structure required by the operation;

(2) powering on the multifunctional near-seismic source vibration recording instrument, carrying out wireless communication connection with an upper computer, and configuring acquisition parameters through an acquisition parameter configuration module;

(3) after the multifunctional near-seismic source vibration recording instrument successfully receives the GPS signal through the GPS module, the GPS time locking and the clock calibration are completed, and the reference timestamp is uploaded;

(4) the active seismic source is excited, a trigger signal identification module of the multifunctional near-seismic source vibration recording instrument identifies a trigger signal, and a data acquisition module starts to acquire a sweep frequency signal given by the active seismic source and uploads the sweep frequency signal to an upper computer in real time;

(5) and after the upper computer receives the effective data frame, drawing and storing the effective data frame.

The acquisition parameters comprise sampling frequency, sampling gain, sampling duration and filter parameters.

After the trigger signal identification module of the multifunctional near-seismic source vibration recording instrument identifies the trigger signal, the data sorting module stores the GPS moment at the moment, uploads the GPS moment to the upper computer, and uploads a sweep frequency signal acquired by the data acquisition module within a sampling duration set after the GPS moment to the upper computer.

The specific steps of the GPS time locking and the clock calibration are as follows: the frequency deviation of the constant temperature crystal oscillator clock is corrected through the GPS second pulse received by the GPS module, when the first GPS second pulse arrives, a timer of the constant temperature crystal oscillator clock is started, when each next second pulse arrives, the value of the timer is compared with the previous second pulse, the difference value is judged, and the constant temperature crystal oscillator clock is adjusted and corrected.

The invention has the advantages that:

the multifunctional near-vibration source vibration recording instrument corrects the frequency offset of the constant-temperature crystal oscillator clock through the GPS second pulse received by the GPS module to achieve high time precision; the multifunctional near-seismic source vibration recording instrument supports three triggering modes, and meets the requirement of the mainstream active seismic source triggering signal identification; the multifunctional near-seismic source vibration recording instrument is in wireless communication connection with the upper computer, so that effective signals can be acquired in real time, the instrument can be operated and controlled remotely, and construction is facilitated.

Drawings

FIG. 1 is a block diagram of the multi-functional near-source seismic recording system of the present invention.

FIG. 2 is a schematic block diagram of the multi-functional near-source seismic recording system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, the multifunctional near-seismic source vibration recording system comprises an upper computer 1, a multifunctional near-seismic source vibration recording instrument 2 and an active seismic source 3, wherein the multifunctional near-seismic source vibration recording instrument 2 is connected with the active seismic source 3 through a cable; the multifunctional near-source vibration recording instrument 2 comprises a data sorting module 21, a wireless communication module 22, a GPS module 23, a constant temperature crystal oscillator clock 24, an acquisition parameter configuration module 25, a trigger signal identification module 26 and a data acquisition module 27, wherein the wireless communication module 22, the GPS module 23, the constant temperature crystal oscillator clock 24, the acquisition parameter configuration module 25 and the data acquisition module 27 are respectively connected with the data sorting module 21; host computer 1 and wireless communication module 22 carry out wireless communication connection, GPS module 23 receives GPS time signal and pulse per second, data arrangement module 21 corrects the frequency offset of constant temperature crystal oscillator clock 24 through the GPS pulse per second that GPS module 23 received, acquire accurate time calibration RTC real-time clock, acquisition parameter configuration module 25 sets up the acquisition parameter, trigger signal identification module 26 detects with discerning the trigger signal of initiative seismic source 3 input, data acquisition module 27 is used for the collection to seismic wave data, data processing module 21 packs the seismic wave data of gathering and present GPS time stamp together and constitutes the data frame.

An acquisition and recording method of a multifunctional near-seismic source vibration recording system specifically comprises the following steps:

(1) arranging the multifunctional near-seismic source vibration recording instrument 2 and the active seismic source 3 according to a topological structure required by operation;

(2) powering on the multifunctional near-seismic source vibration recording instrument 2, carrying out wireless communication connection with the upper computer 1, and configuring acquisition parameters through an acquisition parameter configuration module 25, wherein the acquisition parameters comprise sampling frequency, sampling gain, sampling duration and filter parameters;

(3) after the multifunctional near-seismic source vibration recording instrument successfully receives the GPS signal through the GPS module 23, the GPS time locking and the clock calibration are completed, and the reference timestamp is uploaded;

(4) the active seismic source is excited, the trigger signal identification module 26 of the multifunctional near-seismic source vibration recording instrument identifies a trigger signal, the data sorting module 21 stores the GPS time at the moment and uploads the GPS time to the upper computer 1, meanwhile, the data acquisition module 27 starts to acquire a sweep frequency signal given by the active seismic source and uploads the sweep frequency signal acquired by the data acquisition module 27 within a sampling time set after the time to the upper computer 1;

(5) and after the upper computer 1 receives the effective data frame, drawing and storing the effective data frame.

The specific steps of GPS time locking and clock calibration are as follows:

a. waiting for the arrival of GPS second pulse after the multifunctional near-seismic source vibration recording instrument is started;

b. after the first GPS second pulse comes, starting a counter of a constant temperature crystal oscillator clock 24, wherein the value of the counter is 1 microsecond plus 1;

c. recording the value of a counter when each GPS second pulse arrives; if the difference between the two adjacent pulse-per-second counters is larger than the set upper limit threshold 100002, the reference voltage for triggering the constant temperature crystal oscillator clock 24 is reduced, and the clock frequency is reduced; if the pulse number is smaller than the set lower limit threshold 99998, the reference voltage for triggering the constant temperature crystal oscillator clock 24 is increased, and the clock frequency is increased;

d. when the difference between the values of two adjacent pulse-per-second counters is within the upper threshold and the lower threshold, the reference voltage of the constant-temperature crystal oscillator clock 24 is kept, clock calibration completion information is uploaded, and the clock calibration function is completed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.