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

A technology of transmitting waveform and coding method, which is applied in the field of self-defined coding of transmitting waveform of high-density electrical method, can solve the problems of high-density electrical method detection depth point span, no description process and method, narrow frequency band of encoded signal, etc. Achieving good autocorrelation peak, highlighting IP properties, and strong anti-interference ability
CN102780492BInactive Publication Date: 2015-04-22JILIN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2015-04-22
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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...

Claims

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