CN116165698A

CN116165698A - Application method of reconfigurable antenna based on intelligent wireless geophone

Info

Publication number: CN116165698A
Application number: CN202211384143.8A
Authority: CN
Inventors: 李楠; 康玥
Original assignee: Sichuan Qiruike Technology Co Ltd
Current assignee: Sichuan Qiruike Technology Co Ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-05-26

Abstract

The invention discloses an application method of a reconfigurable antenna based on an intelligent wireless geophone, which comprises the steps of setting configuration information of a communication module transmitter, wherein a reconfigured directional antenna is designed to work at the frequency; setting configuration information of a communication module receiver, and checking the validity of the data packet by using a checksum by a program every time the receiving gateway receives the data packet from the node; if so, the program extracts the 64-bit source address and data from the frame; programming the microcontroller to select a direction having a higher received signal strength indicator level; the microcontroller stores the RSSI values for each gateway in all modes and compares them to select the gateway associated with the greatest RSSI value; setting the address of the selected gateway and preparing the node for transmission; converting seismic waves detected by sensor nodes of the wireless geophones into analog voltage signals; the analog voltage signal is then processed and passed to a communication module for transmission to the gateway in real time.

Description

Application method of reconfigurable antenna based on intelligent wireless geophone

Technical Field

The invention relates to the technical field of industrial Internet of things, in particular to an application method of a reconfigurable antenna based on an intelligent wireless geophone.

Background

The active seismic surveying technology for exploring petroleum and natural gas reservoirs is widely applied to the fields of natural resource exploration such as oil gas, mineral products and the like, geological disaster forecast and the like. The acquisition of seismic surveys has evolved with high density, high sampling rate, large deep exploration, from previous cabled surveys to now cableless portable seismic acquisition nodes, each of which covers the entire survey area, typically in an array configuration, by geophone sensors placed on the ground, and then used to detect the reflected components of these seismic waves.

Cable systems provide reliable uninterrupted operation and high resolution seismic data transmission, but their deployment and maintenance costs increase substantially as survey sizes and densities expand.

Furthermore, the complex environment of certain survey areas makes wired systems expensive and impractical. Therefore, next generation high density acquisition systems will inevitably be moving towards flexible platforms using wireless technology.

Disclosure of Invention

The invention aims to provide an application method of a reconfigurable antenna based on an intelligent wireless geophone, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

an application method of a reconfigurable antenna based on an intelligent wireless geophone comprises the following steps:

setting communication module transmitter configuration information, the reconfigured directional antenna being designed to operate at the frequency and having a matching bandwidth supporting the transmission rate;

setting configuration information of a communication module receiver, and checking the validity of the data packet by using a checksum by a program every time the receiving gateway receives the data packet from the node; if so, the program extracts the 64-bit source address and data from the frame;

programming the microcontroller to select a direction having a higher received signal strength indicator level and switching the reconfigurable antenna to that direction;

the microcontroller stores the RSSI values for each gateway in all modes and compares them to select the gateway associated with the greatest RSSI value; setting the address of the selected gateway and preparing the node for transmission;

converting seismic waves detected by sensor nodes of the wireless geophones into analog voltage signals; the analog voltage signal is then processed and passed to a communication module for transmission to the gateway in real time.

In some embodiments, the processing and passing of the analog voltage signal to the communication module for transmission to the gateway in real time includes: filtering and amplifying the analog voltage signal to remove unwanted signal components due to background vibrations and other noise sources;

the ADC module digitally samples the analog signal at a sampling rate of 500 samples per second at a resolution of 24 bits per sample;

the digital data is processed in the single board computer and then passed to the communication module for transmission to the gateway in real time.

In some embodiments, the method for processing digital data in the on-board computer is to add a header to the on-board computer, including the acquisition time of each sample, and then save the data to the on-board memory in the on-board computer.

In some embodiments, the wireless geophone uses an SM-24 geophone model, allowing implementation with a 2 meter sec sampling interval and a 24 bit resolution per sample, sampling yielding a sampling rate of 500 samples/sec every 2 meters sec and a bandwidth covering the frequency range of interest (10-100 Hz) used in active seismic surveys, with a sensitivity of 28.8V/m/s.

In some embodiments, the analog voltage signal is filtered and amplified into an analog circuit, consisting of a first low pass filter for filtering any frequencies detected by the sensor of the wireless geophone that are outside of the frequency range of interest, an amplifier, and a second low pass filter; the amplifier provides the required high voltage gain to prepare the data sampled by the ADC at high resolution; the final filtering stage of the second low pass filter filters out any noise introduced at higher frequencies during amplification and ensures a smoother attenuation of the low pass response of the overall circuit.

In some embodiments, the digital sampling and processing of digital data is to employ a 24-bit ADC; each time a sample is sampled and digitized, a time stamp is added to the sample to save the sampling time, and after the data received from the ADC is marked by the time stamp, the microcomputer is used for acquiring the sample and executing two basic functions of saving the acquired sample data in parallel; and saving the data as a CSV file into an onboard SD card, and sending the data to a communication module of the sensor node so as to be transmitted to a gateway in real time in a wireless manner.

The application method based on the intelligent wireless geophone reconfigurable antenna has the beneficial effects that the application method comprises the following steps:

the invention adopts an application method based on the reconfigurable antenna of the intelligent wireless geophone, can successfully capture the seismic data from the geophone sensor and wirelessly transmit the seismic data to the gateway unit in real time, the communication range between the sensor node and the gateway is obviously improved by 25 percent, and compared with a similar system using a monopole antenna, the enhancement of the communication range ensures that the coverage of the communication area of the gateway is obviously improved by 56 percent.

Drawings

FIG. 1 is a schematic diagram of a wireless geophone according to the present invention.

FIG. 2 is a schematic representation of a geophone acquisition flow chart according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions in the embodiments of the present application are described in more detail. The described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

An application method of the reconfigurable antenna based on the intelligent wireless geophone according to the embodiments of the present application will be described in detail with reference to fig. 1-2. It is noted that the following examples are only for explaining the present application and are not limiting of the present application.

1-2, the application method based on the intelligent wireless geophone reconfigurable antenna is realized based on a wireless geophone sensing system and comprises a wireless geophone sensor node and a gateway unit, wherein the wireless geophone sensor node comprises a data acquisition module and a communication module.

The analog voltage signal is processed and transferred to a communication module for real-time transmission to a gateway, comprising: filtering and amplifying the analog voltage signal to remove unwanted signal components due to background vibrations and other noise sources;

In some embodiments, the analog voltage signal is filtered and amplified into an analog circuit, consisting of a first low pass filter for filtering any frequencies detected by the sensor of the wireless geophone that are outside of the frequency range of interest, an amplifier, and a second low pass filter; it is therefore designed to a theoretical ideal cut-off frequency of about 150HZ. The amplifier provides the required high voltage gain to prepare the data sampled by the ADC at high resolution; the final filtering stage of the second low pass filter filters out any noise introduced at higher frequencies during amplification and ensures a smoother attenuation of the low pass response of the overall circuit.

In some embodiments, the digital sampling and processing of digital data is to employ a 24-bit ADC; because it is able to distinguish 224 different voltage levels within a narrow voltage range of 0 to 5 volts, which means that each level represents approximately 0.3 μv; meets the high resolution requirement of seismic exploration. Each time a sample is sampled and digitized, a time stamp is added to it to preserve the time of the sample, which is just the key information needed to process the data later, in order to properly interpret it. After time stamping the data received from the ADC, the microcomputer is configured to perform two basic functions in parallel; and saving the data as a CSV file into an onboard SD card, and sending the data to a communication module of the sensor node so as to be transmitted to a gateway in real time in a wireless manner.

The gateway adopts a raspberry group single board computer, and is a computer with small volume and low cost. The Raspberry Pi 2-B type is used because it provides good power efficiency compared to other models, as well as compatibility with high precision analog-to-digital/digital templates.

The wireless communication module adopts an XBE RF module and an Arduino microcontroller for controlling antenna reconfigurability and XBE module operation in an API mode. The working frequency of the module is 2.4GHz, is compatible with various wireless systems, can support reasonable data rate, low power consumption and wide coverage, and can wirelessly transmit high-resolution data from XBE to a gateway.

The antenna needs to be able to support the carrier frequency and provide sufficient bandwidth for the required data rate, matching bandwidth of about 200MHz.

The wireless geophones are placed in a box of sand and the gateway is connected to a laptop computer to map the received results in real time. The detector is activated by continuously tapping (by hand) a table placed on top of the system with different forces, which produce different magnitudes, the data being received wirelessly at the gateway.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. An application method of a reconfigurable antenna based on an intelligent wireless geophone is characterized by comprising the following steps:

2. The method of claim 1, wherein the processing and passing the analog voltage signal to the communication module for real-time transmission to the gateway comprises: filtering and amplifying the analog voltage signal to remove unwanted signal components due to background vibrations and other noise sources;

3. The method of claim 2, wherein the method of processing digital data in the on-board computer includes adding a header to the on-board computer including the time of acquisition of each sample, and storing the data in an on-board memory in the on-board computer.

4. The method of claim 1, wherein the wireless geophone uses an SM-24 geophone model, allowing for implementation with a sampling interval of 2 meters sec and a resolution of 24 bits per sample, sampling yielding a sampling rate of 500 samples/sec every 2 meters sec and a bandwidth covering the frequency range of interest (10-100 Hz) used in active seismic surveys, the sensitivity of the geophone used being 28.8V/m/s.

5. The method of claim 1, wherein the filtering and amplifying the analog voltage signal into an analog circuit comprises a first low pass filter, an amplifier, and a second low pass filter, the first low pass filter being configured to filter any frequencies detected by the sensor of the wireless geophone that are outside of the frequency range of interest; the amplifier provides the required high voltage gain to prepare the data sampled by the ADC at high resolution; the final filtering stage of the second low pass filter filters out any noise introduced at higher frequencies during amplification and ensures a smoother attenuation of the low pass response of the overall circuit.

6. The method of claim 1, wherein the digitally sampling and processing digital data is to employ a 24-bit ADC; each time a sample is sampled and digitized, a time stamp is added to the sample to save the sampling time, and after the data received from the ADC is marked by the time stamp, the microcomputer is used for acquiring the sample and executing two basic functions of saving the acquired sample data in parallel; and saving the data as a CSV file into an onboard SD card, and sending the data to a communication module of the sensor node so as to be transmitted to a gateway in real time in a wireless manner.