Abstract
Seismic communication might promise to revolutionize the theory of seismic waves. However, one of the greatest challenges to its widespread adoption is the difficulty of signal extraction because the seismic waves in the vibration environments, such as seas, streets, city centers and subways, are very complex. Here, we employ segmented correlation technology with Morse code (SCTMC), which extracts the target signal by cutting the collected data into a series of segments and makes these segments cross-correlate with the decoded signal to process the collected data. To test the effectiveness of the technology, a seismic communication system composed of vibroseis sources and geophones was built in an environment full of other vibration signals. Most notably, it improves the signal-to-noise ratio (SNR), extending the relay distance and suppressing other vibration signals by using technology to deal with seismic data generated by the system.
Highlights
Communication with Morse Code.As early as 1899, scientists started to discuss how to implement a system of communication which could transmit signals through the earth [1]
We have presented the segmented correlation technology with Morse code (SCTMC) to extract the target signal (SOS) and built a seismic communication system
We first discuss the influence of other vibration signals on the target signal using different transmitting devices, such as hammers and vibroseis sources
Summary
Communication with Morse Code.As early as 1899, scientists started to discuss how to implement a system of communication which could transmit signals through the earth [1]. Over the last three decades, many methods have been proposed for communication in special circumstances where radio cannot operate, such as during mine disasters or wars, as mentioned above To overcome this problem, Hanafy conducted a seismic communication test, where hammering signals are encoded and filtered by a band-pass filter with a hammer and geophones [6,7]. Zhang discussed the transmission of seismic signals with direct sequence spread spectrum technology (DSSS), orthogonal frequency division multiplexing technology (OFDM) and code division multiple access technology (CDMA) [10] He pointed out that a RAKE receiver could be used to solve the problem of multipath fading of seismic waves by MATLAB simulation [11]
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