User-defined encoding method of transmission waveform of high-density electric instrument

Abstract

The invention relates to a user-defined encoding method of a transmission waveform of a high-density electric instrument. A transmission signal of the high-density electric instrument is subjected to user-defined encoding based on random Gaussian white noise; an encoding process consists of steps of selecting main frequencies, mixing and encoding in a shaping manner according to an encoding principle; and the transmission signal is transmitted underground by the high-density electric instrument after the transmission signal is subjected to user-defined encoding. The quantity, amplitude, range and positions of the main frequencies can be determined by a user according to specific exploration target requirements, so that the flexibility of signal selection is increased. The code type is very beneficial to earth electricity exploration. By utilizing the user-defined encoding method, not only can the exploration depth be designed by the user, but also the noise interference signals can be effectively reduced, so that the excitation property of an earth electricity body can conveniently and prominently shown; and meanwhile, the resolution of the depth detection can be improved. The user-defined encoding method has the advantages of good self-correlation peak and strong anti-interference capability, and is beneficial to signal de-noising treatment in a later period.

Description

Technical field: [0001] The invention relates to a transmitting signal of a geophysical prospecting electrical instrument, in particular to a self-defined coding method for transmitting waveforms of a high-density electrical instrument. Background technique: [0002] High-density electrical prospecting systems play a very important role in today's geophysical prospecting field. Traditional electrical instruments mainly emit DC square wave signals, which are not conducive to extracting different frequency components. [0003] In July 2010, Academician He Jishan proposed a method based on 2 n (n is an odd number) m-sequence pseudo-random coding electrical mixing transmission technology, this technology completes the purpose of mixing transmission in one transmission, and the main frequency of m-sequence pseudo-random coding is equidistant on logarithmic coordinates , which is beneficial to geoelectric exploration. However, the pseudo-random code also has several deficiencies...

AI Technical Summary

Problems solved by technology

However, the pseudo-random code also has several deficiencies: First, although the main frequency of the pseudo-random code is equidistant on the logarithmic axis, the frequency between adjacent main frequencies is multiplied, resulting in an excessive span of depth points for high-density electrical detection. In addition, it can be seen from the frequency spectrum of the pseudo-random code that the frequency band of the coded signal is relatively narrow, which is not conducive to the denoising process in the later stage.

The article only mentions that custom waveforms can be transmitted, but does not describe the process and method of generation, and how to transmit custom codes

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