Low-frequency ground-penetrating communication system based on squid array

A technology of through-the-earth communication and array, applied in transmission systems, electrical components, etc., can solve the problems of weak communication signal strength, low efficiency of electromagnetic wave transmitting antennas, and reduced reliability and effectiveness of communication systems, so as to improve accuracy, improve The effect of receiving signal-to-noise ratio and reducing communication bit error rate

Active Publication Date: 2015-08-26
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

(2) In the low-frequency and extremely low-frequency electromagnetic wave frequency bands, the efficiency of the transmitting antenna for transmitting electromagnetic waves in this frequency band is very low, and in the ground-penetrating communication, the electromagnetic wave has to be attenuated by multiple penetrations and refractions, so that the communication signal at the receiving point The strength is very weak, so the reliability and effectiveness of the communication system are reduced

Method used

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  • Low-frequency ground-penetrating communication system based on squid array
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  • Low-frequency ground-penetrating communication system based on squid array

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Experimental program
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Embodiment 1

[0027]The SQUID device is glued on the carrier, and then the carrier is installed on the bracket to form a two-channel planar array. Image 6 is the magnetic field noise measured indoors by the two-channel SQUID and the combined noise of the two channels, from Image 6 It can be seen that in the white noise section, the noise after channel synthesis is smaller than the noise of each individual channel. The experimental results prove that this design scheme has a certain effect in noise suppression. If the channel number of the SQUID array is increased, the noise suppression effect will be greatly improved accordingly, so the present invention has positive significance for improving the system signal-to-noise ratio.

Embodiment 2

[0028] Embodiment 2 The Solution to the Crosstalk Problem

[0029] When the multi-channel readout circuit is connected to the SQUID array, multiple loops are formed. Since the distance between the SQUID devices is relatively close, and the distance between the device and the low-temperature cable connected to the readout circuit is also very small, it is very easy to Severe crosstalk occurs, causing the performance of the SQUID array to degrade or even fail to work properly. Based on the research of the inventor on the problem of SQUID crosstalk, the sources of crosstalk between channels include the following aspects: other channel SQUID feedback magnetic flux interference; other channel SQUID modulated magnetic flux interference; multi-channel connection lines between SQUID devices and readout circuits are coupled to each other. Channel crosstalk causes the performance of multi-channel SQUID modules to degrade or even fail to work.

[0030] Based on the existing research and...

Embodiment 3

[0031] Embodiment 3 Weak signal processing method based on SQUID array

[0032] Improving the receiving signal-to-noise ratio of low-frequency communication signals is a crucial issue in low-frequency through-the-earth communication systems. In low-frequency communication systems, the communication signals received at the receiving point are weak signals, which not only means that the amplitude of the signal is very small, but also The signal is completely submerged by strong noise, so the detection of the signal is very difficult. In order to improve the signal-to-noise ratio of the receiving end, the present invention proposes to use the empirical mode decomposition method to solve the weak signal processing problem based on the SQUID array.

[0033] The Empirical Mode Decomposition (EMD) method is suitable for the analysis of nonlinear and non-stationary signals, and is also suitable for the analysis of linear and stationary signals. This noise reduction method retains The...

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Abstract

The invention relates to a low-frequency through-the-earth communication system and a low-frequency through-the-earth communication method based on a superconducting quantum interference device (SQUID) array. The system is characterized by sequentially consisting of low-frequency signal transmission, wireless transmission earth channel and signal reception and analysis based on the SQUID array, wherein the signal reception based on the SQUID array integrates integration of multiple superconducting SQUID devices, a reading circuit matched with the SQUID array and Dewar which provides a low-temperature environment for the SQUID array. When the system is used, a multi-channel crosstalk solution method and a weak signal processing method are required to be considered. The signal to noise ratio of signal reception and signal reception accuracy can be improved on the basis, and the communication error rate is reduced.

Description

technical field [0001] The invention relates to a low-frequency ground-penetrating communication system and method based on a superconducting sensor array. It belongs to the technical field of through-ground communication. Background technique [0002] Mineral resources are an important material basis for national economic development and social progress, so mining is the basic industry of the national economy. However, most of the mining production activities are characterized by construction operations deep underground, with narrow spaces and harsh working environments. When an emergency occurs, rescue should be carried out as soon as possible. However, the current communication system is mainly based on wired transmission. After a disaster accident, the line is easily damaged, causing communication interruption, making it difficult for miners to contact the ground personnel, and the ground rescue personnel cannot timely and accurately understand the status and location o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04B1/16
Inventor 王会武荣亮亮徐婷常凯伍俊蒋坤侍文谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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