Vibroseis phase-locked control system

A control system and phase-locking technology, applied in the field of seismic exploration control systems, can solve the problems of inability to fully adapt to complex and changeable geological conditions, strong system model dependence, poor environmental adaptability, etc. System volume, the effect of improving anti-noise capability

A control system and phase-locking technology, applied in the field of seismic exploration control systems, can solve the problems of inability to fully adapt to complex and changeable geological conditions, strong system model dependence, poor environmental adaptability, etc. System volume, the effect of improving anti-noise capability

CN103323874BInactive Publication Date: 2015-09-23JILIN UNIV
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  • Vibroseis phase-locked control system
  • Vibroseis phase-locked control system
  • Vibroseis phase-locked control system

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Embodiment Construction

[0023] Further detailed description will be given below in conjunction with the accompanying drawings and embodiments.

[0024] The phase-locked control system of the vibrator is composed of DSP1 respectively connected to the keyboard module 2 and the liquid crystal display module 3 to form the main control unit β‘ ; the standard signal source 4 is connected to the PID through the phase converter β… 5, the phase-locked controller 6 and the error obtaining module 7 The regulator 8 is connected, the error obtaining module 7 is connected with the analog-to-digital converter 13 through the K-L analysis filter 12, and the phase-lock controller 6 is connected with the K-L analysis filter 12 through the phase converter II to form a phase-lock control unit β‘‘; The converter 9 is connected with the signal conditioning circuit 14 via the low-pass filter 11 to form a signal acquisition and output unit β‘’; the acceleration sensor 15 is connected with the power amplifier 17 via the vibrator 16 to...

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Abstract

The invention relates to a vibroseis phase-locked control system which is formed by that a main control unit is respectively connected with a phase-locked control unit and a signal acquisition and output unit which is connected with a vibroseis module. A K-L decomposition filter is realized in an FPGA chip through programming, the influence of an external electromagnetic interference noise on a phase-locked loop is avoided, the anti noise performance of the system is raised, the zero phase shifting filtering of a vibroseis feedback signal is realized, the problems of feedback signal phase detection time offset and zero jump are solved, thus the phase detection accuracy is improved significantly, and the phase accuracy of a phase-locked loop output signal is increased. At the same time, according to the system, a standard signal is generated by a direct frequency synthesizer (DDS), and compared with the existing analog phase-locked loop control scheme, according to the phase control scheme with the combination of the direct frequency synthesizer and digital phase-locked loop technology, the speed of vibroseis phase-locked control is greatly improved.

Description

Technical field: [0001] The invention relates to a control system for seismic exploration, in particular to the phase-locked control of various vibrators using frequency-sweeping excitation signals. Background technique: [0002] The vibroseis, which is widely used in the field of engineering seismic exploration, is a non-explosive source, which can generate excitation signals with controllable waveforms, and use pulse compression technology to concentrate the small energy and long-term excitation wave energy, so as to achieve instantaneous large The energy excites seismic waves. However, in actual seismic exploration, the nonlinearity of the vibroseis system and the coupling between the vibrator substrate and the ground usually cause phase distortion of the vibrator, resulting in a decrease in the signal-to-noise ratio of seismic exploration. The phase distortion of the vibroseis means that the phase of the seismic wave emitted by the vibroseis varies nonlinearly with the ...

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Application Information

Patent Timeline
23 Sep 2015
Publication
CN103323874B
IPC
G01V1/04
Inventors
姜弒; 姚恩θΆ