CN218772063U

CN218772063U - Underground wireless short-distance transmission and receiving device

Info

Publication number: CN218772063U
Application number: CN202320234283.0U
Authority: CN
Inventors: 潘勇
Original assignee: Zhongke Yihai Microelectronics Technology Chengdu Co ltd
Current assignee: Zhongke Yihai Microelectronics Technology Chengdu Co ltd
Priority date: 2023-02-16
Filing date: 2023-02-16
Publication date: 2023-03-28
Anticipated expiration: 2033-02-16

Abstract

The utility model provides a downhole wireless short transmission receiving device, which comprises a receiving antenna, an amplifier, an analog-to-digital converter, a demodulation module and a data compression module, wherein the demodulation module and the data compression module are realized on an FPGA chip; the demodulation module and the data compression module are realized on the FPGA with the reconfigurable function, and the demodulation module and the data compression module are realized by burning the bit stream file of the FPGA, so that the design of adding a plurality of filter circuits to a single chip microcomputer in the original design is replaced, the difficulty of circuit design is reduced, the uniformity of circuit design is improved, the filter module does not need to be replaced when the transmission frequency is subsequently changed, hardware does not need to be modified, and only the bit stream file software of the FPGA needs to be upgraded. The data compression module is used for solving the contradiction between narrow data bandwidth and large data volume, and the compression module compresses the data volume to be less than the original 20 percent.

Description

Underground wireless short-distance transmission and receiving device

Technical Field

The utility model belongs to the wireless receiving field especially relates to a wireless short-distance transmission receiving arrangement in pit.

Background

The main problem in oil field exploration and oil well development in China is that a large number of low-yield and lean oil layers exist, a horizontal well technology is needed to be used for exploiting such oil layers, and the distance between a measuring point of a conventional Logging While Drilling (LWD) system and a drill bit is 10-15m, so that the development requirement of horizontal wells for thin oil layers and ultrathin oil layers cannot be met. Therefore, in order to obtain information of the downhole operation of the drill bit more timely and accurately, development difficulties of thin and poor oil layers are solved by the appearance of near bit While Drilling (MWD) logging While Drilling (abbreviated as MWD) equipment. But transferring data across the motor to the MWD also becomes a bottleneck affecting the development of drilling technology. The problem can be solved by the wireless short transmission technology, the zero-distance measurement from a drill bit is realized, the actual well hole is ensured to penetrate through the optimal position of the reservoir, and the instantaneity of the acquisition of the geosteering parameters is further improved.

As shown in fig. 1, the receiving module of the underground wireless short transmission system is conventionally designed such that after receiving modulated data, the receiving antenna amplifies and filters the data through an amplifier, and an analog-to-digital converter performs analog-to-digital acquisition and demodulation, and the filtering is realized by using a single circuit module and a demodulation means as a main control unit singlechip. However, the design is complex, and the use of discrete devices, especially analog devices, is various; the data transmission bandwidth is narrow, and data cannot be transmitted in real time during large-amount transmission.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to current receiving system design complicacy, problem that can not real-time transmission when large amount of data transmission provides a wireless short-distance transmission receiving arrangement in pit.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:

a wireless short-distance transmission receiving device in the pit comprises a receiving antenna, an amplifier, an analog-to-digital converter, a demodulation module and a data compression module, wherein the demodulation module and the data compression module are realized on an FPGA chip;

the receiving antenna is used for receiving modulated data;

the amplifier is used for amplifying the modulation data received by the receiving antenna;

the analog-to-digital converter is used for converting the sampled analog signal into a digital signal;

the demodulation module is used for demodulating the modulation data according to the modulation form to obtain a baseband signal;

the data compression module is used for compressing the baseband signal.

Further, the demodulation module includes a band pass filter corresponding to the received frequency, a low pass filter corresponding to the band pass filter, an adder for adding signals from all the low pass filters, and a decision device for deciding a signal from the adder.

Furthermore, the circuit structures of the demodulation module and the data compression module are formed by programming a preset bit stream file of the FPGA.

Further, the number of the band-pass filters is consistent with the number of the received intermediate frequency signal sources, and the number of the low-pass filters is consistent with the number of the band-pass filters.

Adopt above-mentioned technical scheme, the utility model discloses following beneficial effect has:

the utility model provides a pair of wireless short pass receiving arrangement in pit, through realizing demodulation module and data compression module on the FPGA that has the reconfigurable function, because demodulation module and data compression module's function is realized burning through FPGA's bit stream file and is written and form, the singlechip that has replaced original design adds the design of a plurality of filter circuit, circuit design's the degree of difficulty has been reduced, circuit design's uniformity has been improved, follow-up change transmission frequency also need not to replace filter module, need not to modify the hardware, only need to upgrade FPGA's bit stream file software can. The data compression module is used for solving the contradiction between narrow data bandwidth and large data volume, and the compression module compresses the data volume to be less than the original 20 percent.

Drawings

FIG. 1 is a receiving system of conventional construction;

fig. 2 is a schematic diagram of a receiving system based on FPGA according to the present invention;

fig. 3 is a schematic structural diagram of a demodulation module.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 2, the embodiment of the present invention relates to a downhole wireless short transmission receiving device, which comprises a receiving antenna, an amplifier, an analog-to-digital converter, and a demodulation module and a data compression module implemented on an FPGA chip;

the receiving antenna is used for receiving modulated data;

the demodulation module is used for demodulating the modulation data according to the modulation form to obtain a baseband signal. In this embodiment, the demodulation module includes a band pass filter corresponding to the received frequency, a low pass filter corresponding to the band pass filter, an adder that adds signals from all the low pass filters, and a decision device that decides a signal from the adder. As shown in fig. 3, there are two band pass filters with center frequencies f1 and f2, respectively, each corresponding to a low pass filter, and an adder adds the signals from the two low pass filters. The number of the band-pass filters is consistent with the number of the received intermediate frequency signal sources, and the number of the low-pass filters is consistent with the number of the band-pass filters.

The data compression module is used for compressing the baseband signal. In the embodiment, when the data transmission quantity is large, the data is transmitted downwards to the slurry transmission system and needs to be transmitted after being compressed, and the system can complete lossless compression of the data in the FPGA, so that large-quantity data transmission is realized. The compression ratio can be less than 20%, so that the data transmission quantity can be effectively increased by at least 5 times.

In this embodiment, the circuit structures of the demodulation module and the data compression module are programmed by a preset bit stream file of the FPGA. According to the embodiment, the design that a single chip microcomputer and a plurality of filter circuits are replaced by one FPGA, the difficulty of circuit design is reduced, the characteristics that an FPGA chip can be reconstructed and a function module can be realized by burning and writing bit streams are fully utilized, extra hardware is not needed to be added, the use amount of circuit devices is effectively reduced, the filter module is not needed to be replaced when the transmission frequency is subsequently changed, the hardware is not needed to be modified, and only the bit stream file software of the FPGA is needed to be upgraded.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The underground wireless short transmission receiving device is characterized by comprising a receiving antenna, an amplifier, an analog-to-digital converter, a demodulation module and a data compression module, wherein the demodulation module and the data compression module are realized on an FPGA chip;

the receiving antenna is used for receiving modulated data;

the data compression module is used for compressing the baseband signal.

2. The receiving apparatus according to claim 1, wherein the demodulation module includes a band pass filter corresponding to the received frequency, a low pass filter corresponding to the band pass filter, an adder for adding signals from all the low pass filters, and a decision device for deciding a signal from the adder.

3. The receiving device according to claim 2, wherein the circuit structures of the demodulation module and the data compression module are programmed from a preset bit stream file of the FPGA.

4. The receiving apparatus according to claim 3, wherein the number of band pass filters corresponds to the number of received intermediate frequency signal sources, and the number of low pass filters corresponds to the number of band pass filters.