CN103576185A

CN103576185A - Seismic survey GPS based on phase-locked loop circuit

Info

Publication number: CN103576185A
Application number: CN201210257678.9A
Authority: CN
Inventors: 张超; 王浩; 李素非; 王若擎
Original assignee: 张超
Priority date: 2012-07-24
Filing date: 2012-07-24
Publication date: 2014-02-12

Abstract

The invention discloses a seismic survey GPS based on a phase-locked loop circuit. The seismic survey GPS comprises a central micro-processor, a GPS receiver, a liquid crystal display, a constant-temperature crystal oscillator, an electric spark seismic source, a multi-channel acoustic wave collector and a phase-locked loop integrated circuit chip CD4046. According to the seismic survey GPS, the GPS receiver is integrated on the electric spark seismic source and the multi-channel acoustic wave collector and is controlled by the micro-processor to work, the electric spark seismic source is motivated to work when PPSs of the GPS are counted from one moment to a certain specified second, and meanwhile the multi-channel acoustic wave collector is started to collect signals. The phase-locked loop circuit is connected to the PPS output end of the GPS to achieve strict synchronization of clock signals, frequency division signals of the constant-temperature crystal oscillator serve as the synchronous clock signals when the GPS loses efficacy so as to achieve the effect that seismic data are accurately collected, analyzed and processed, and the seismic survey efficiency and the seismic survey accuracy are improved.

Description

Seismic survey gps system based on phase-locked loop circuit

Technical field

The present invention relates to a kind of seismic survey gps system based on phase-locked loop circuit.

Background technology

In recent years, earthquake disaster Dou Shidui China and all brought very large loss all over the world.Especially recent years, there is the phenomenon that earthquake takes place frequently all over the world, the Wenchuan violent earthquake of 08 year, the Chilean violent earthquake of 09 year, the Yushu district, Qinghai violent earthquake of 10 years and the Earthquakes in Japan tsunami of 11 years have all been beaten alarm bell to us, the research and development of earthquake prediction is extremely urgent, if we can locate focus accurately, will shake timely and effectively rear rescue work to us and bring greatly facility.

GPS comprises gps satellite, ground supports system, GPS receiver three parts.Gps satellite signal comprises carrier wave, ranging code and three kinds of component of signals of navigation message.By GPS, can reach relatively strict synchronous effect, then according to the sampling time reconfigure, sampling, analytical calculation be to carry out acquisition and processing geological data exactly, thereby reach the tremendous increase of exploration efficiency and validity.

Phase-locked loop structures is by phase detector PD, and loop filter LF and voltage controlled oscillator VCO form.By add phase-locked loop circuit in seismic surveying system, can make GPS pps pulse per second signal and constant-temperature crystal oscillator fractional frequency signal keep strict synchronous.Thereby realize pinpoint accuracy collection, control and processing seismic signal and data.

Summary of the invention

Technical matters to be solved by this invention is: traditional seismic survey device is improved, by adding phase-locked loop circuit, to guarantee control sparker source, the synchronous of hyperchannel sound wave Acquisition Instrument of pinpoint accuracy, send out, receive, improve collecting efficiency, reduce Acquisition Error, and reach the object of synchronous multiple list receipts and MIMO (Multiple-Input Multiple-Out-put).

The technical solution adopted for the present invention to solve the technical problems is: integrated GPS receiver on sparker source and hyperchannel sound wave Acquisition Instrument, by microprocessor, control GPS operation of receiver, when at a time GPS pps pulse per second signal (1PPS) count down to a certain second of regulation, excite sparker source work, hyperchannel sound wave Acquisition Instrument starts collection signal simultaneously.

GPS exports universal time (UTC), longitude (longitude), latitude (latitude) and pps pulse per second signal (1PPS), LCDs (LCD) demonstrates time, coordinate so that real time inspection under the control of microprocessor; Assist in synchronization crystal oscillator when constant-temperature crystal oscillator (OCXO) is mainly used in replacing GPS pps pulse per second signal or lost efficacy as GPS; Phase-locked loop intergrated circuit (PLL) can make GPS pps pulse per second signal and constant-temperature crystal oscillator fractional frequency signal keep strict synchronous.

That described microprocessor adopts is S3C44BOX, and it is the microprocessor of a kind of 32, and inside comprises the cache, internal SRAM, lcd controller of 8K etc.

Described sparker source is by multiplication of voltage booster circuit, to a group capacitor charging, arrives after setting value, by discharge switch moment, to discharge in water, produce seismic event, and use data collecting instrument record data, observation place shake wave frequency, the length of amplitude and vibration.

Described hyperchannel sound wave Acquisition Instrument is comprised of seismoreceiver, amplification system, register system three parts, forms a seismic trace, for gathering and record seismic signal.

Described GPS receiver can be under the control of microprocessor the details such as output satellite state, positioning time, longitude and latitude.

Useful result:

The present invention is the seismic surveying system that adopts GPS and phase-locked loop circuit, for carrying out source location exploration and location.By adding phase-locked loop intergrated circuit, play the effect of synchronous clock, reach and improve monitoring efficiency, reduce the effect of monitoring cost and monitoring error.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is system construction drawing of the present invention;

Fig. 2 is typical phase-locked loop circuit structural drawing;

Fig. 3 is GPS pps pulse per second signal and constant-temperature crystal oscillator fractional frequency signal synchronization scheme;

Embodiment

Below in conjunction with the drawings and specific embodiments, further set forth the present invention.Should be understood that these examples only do not limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.

A seismic survey gps system for phase-locked loop circuit, it comprises GPS receiver, microprocessor, phase-locked loop intergrated circuit and sparker source and multichannel sound collecting instrument.

Main implementation of the present invention is the integrated GPS receiver of difference on sparker source and sound wave Acquisition Instrument, make them there is the synchronous ability of sending out, synchronously receiving, in exploration process, set the concrete time interval gathering, so just can be according to the time of setting under the control of GPS, the sparker source generation seismic event that sparks, sonic apparatus starts the sound wave that collection transmits by medium (stratum, concrete etc.) simultaneously, and according to concrete moment preservation, so that analyze particularly, process these data.

Phaselocked loop (PLL) integrated circuit (IC) chip that the present invention adopts is CD4046, CD4046 is general CMOS phaselocked loop (PLL) integrated circuit, in instrument, mainly play clock synchronous effect, make constant-temperature crystal oscillator (OCXO) fractional frequency signal and GPS pulse per second (PPS) (1PPS) signal keep strict synchronous.The frequency of operation of CD4046 is lower than 1.2MHz, and supply voltage is 5 to 15V, is the cmos digital ring of low-power consumption, low frequency.

Part that the seismic survey device of the present invention design is better than other is its phaselocked loop integrated chip CD4046 that has adopted low-power consumption, low frequency, its objective is and make GPS pps pulse per second signal and constant-temperature crystal oscillator fractional frequency signal keep strict synchronous, thereby the efficiency of focus exploration is promoted greatly, and reduce the error that source location is detected.As shown in Figure 3, the GPS pps pulse per second signal by the signal VCOo of phaselocked loop (PLL) circuit output and the input of input reaches phase-locking.

Claims

1. the seismic survey gps system based on phase-locked loop circuit, is characterized in that it comprises S3C44BOX microprocessor, GPS receiver, sparker source and hyperchannel sound wave Acquisition Instrument, and phase-locked loop intergrated circuit chip CD4046.Described microcontroller is used for controlling GPS operation of receiver, when at a time GPS pps pulse per second signal (1PPS) count down to a certain second of regulation, excites sparker source work, and hyperchannel sound wave Acquisition Instrument starts collection signal simultaneously.Described phase-locked loop circuit is used for guaranteeing that GPS pps pulse per second signal and constant-temperature crystal oscillator fractional frequency signal keep strict synchronous, has reached high precision collecting and deal with data.

2. the seismic survey gps system based on phase-locked loop circuit according to claim 1, is characterized in that microcontroller is as core, controls analysis, processing and the demonstration output of the signal collecting.

3. the seismic survey gps system based on phase-locked loop circuit according to claim 1, it is characterized in that GPS pps pulse per second signal output terminal connects phase-locked loop structures, guarantee that clock signal is strictly synchronous, control sparker source, the synchronous of hyperchannel sound wave Acquisition Instrument of guaranteeing pinpoint accuracy send out, receive, improve collecting efficiency, reduce Acquisition Error, and can reach the object of synchronous multiple list receipts, MIMO (Multiple-Input Multiple-Out-put).

4. the seismic survey gps system based on phase-locked loop circuit according to claim 1, it is characterized in that connecting constant-temperature crystal oscillator at phase-locked loop circuit feedback end, be used for replacing GPS pps pulse per second signal or when GPS lost efficacy as assist in synchronization crystal oscillator, and there is high freuqency accuracy, high stability and low-noise characteristic.