A shooting time generation method for blended acquisition
GAN Zhiqiang1,2, SUN Xiang'e1, WEI Jian1
1. School of Electronic Information and Electrical Engineering, Yangtze University, Jingzhou, Hubei 434023, China; 2. Xi'an Geophysical Prospecting Equipment Company of BGP, CNPC, Xi'an, Shaanxi 710061, China
Abstract:The design of excitation source start-up time is one of the key technologies for efficient aliasing acquisition.The high-efficiency aliasing acquisition is a new acquisition mode produced by high-density seismic exploration, which can significantly shorten the seismic exploration period and reduce the acquisition cost, but the random degree of excitation source start-up time directly affects the quality of the acquired data.Therefore, this paper proposes an innovative algorithm for generating random excitation time in seismic exploration.Firstly, the local clock calibration and satellite time synchronization in a fixed time interval is carried out with using the satellite timing technology and the voltage-frequency linear relationship of a voltage-controlled crystal oscillator in a shorter period of time.Then the expected excitation time with a deviation of less than 10 μs is calculated based on the information of the source location, ready shot point excitation order, and time-distance rule parameters.Lastly, based on the predicted excitation time, the vibration sensor data collected in real time are used as the seed to randomly generate a random number of small jitter in a specified window as the source start-up time in millisecond to ensure the randomness of the production excitation time.The test solution shows that the dithered value of the random excitation time by the proposed algorithm has the characteristics of numerical size, controllable range, and strong randomness, which is closer to the actual needs of industrial applications.
SILVERMAN D.Method of Three Dimensional Seismic Prospecting:4159463[P].1979-06-26.
[2]
ALLEN K P, JOHNSON M L, MAY J S.High fidelity vibratory seismic (HFVS) method for acquiring seismic data[C].SEG Technical Program Expanded Abstracts, 1998, 17:140-143.
[3]
SALLAS J J, GIBSON J B, LIN F, et al.Broadband vibroseis using simultaneous pseudorandom sweeps[C].SEG Technical Program Expanded Abstracts, 2008, 27:100-104.
[4]
BAGAINI C, JI Y.Dithered slip-sweep acquisition[C].SEG Technical Program Expanded Abstracts, 2010, 29:91-95.
[5]
FROMYR E, CAMBOIS G, LOYD R, et al.Flam:a simultaneous source wide azimuth test[C].SEG Technical Program Expanded Abstracts, 2008, 27:2821-2825.
[6]
HAMPSON G, STEFANI J, HERKENHOFF F.Acquisition using simultaneous sources[J].The Leading Edge, 2008, 27(7):918-923.
[7]
ZHANG Z B, LUO W, ZENG T, et al.The first marine seismic survey of dual-source random shooting offshore China[C].SEG Technical Program Expanded Abstracts, 2019, 38:288-292.
[8]
ALLAN D W, WEISS M A.Accurate time and frequency transfer during common-view of a GPS satellite[C].34th Annual Symposium on Frequency Control, 1980, 334-346.
[9]
DAVIS D D, WEISS M A, CLEMENTS A C, et al.Remote synchronization within a few nanoseconds by simultaneous viewing of the 1.575 GHz GPS satellite signals[J].Alspach W J, Ed, CPEMDig N, 1982, 15:1982.
[10]
WEISS M, ZHANG V, NELSON L, et al.Delay variations in some GPS timing receivers[C].Proceedings of International Frequency Control Symposium, 1997, 304-312..
[11]
MANNERMAA J, KALLIOMAKI K, MANSTÉN T, et al.Timing performance of various GPS receivers[C].Proceedings of the 1999 Joint Meeting of the European Frequency and Time Forum and the IEEE International Frequency Control Symposium (Cat No 99CH36313), IEEE, 1999, 287-290.
[12]
MUMFORD P J.Relative timing characteristics of the one pulse per second (1PPS) output pulse of three GPS receivers[C].Proceedings of the 6th International Symposium on Satellite Navigation Technology Including Mobile Positioning & Location Services (SatNav 2003), Melbourne, Vic, Australia, 2003, 1-10.
[13]
PALLIER D, LE CAM V, Pillement S.Energy-efficient GPS synchronization for wireless nodes[J].IEEE Sensors Journal, 2021, 21(4):5221-5229.
[14]
CANTOR S R, STERN A, Levy B.Clock technology[C].Proceedings of the 55th Annual Meeting of The Institute of Navigation (1999), 1999, 37-47.
[15]
GOBATO R, GOBATO M R R, HEIDARI A.Rhodochrosite as crystal oscillator[J].American Journal of Biomedical Science & Research, 2019, 3(2):187.
[16]
TIAN R, ZHANG J, ZHANG S, et al.A high-precision energy-efficient GPS time-sync method for high-density seismic surveys[J].Applied Sciences, 2020, 10(11):3768.
[17]
MA Y, CHEN T, LIN J, et al.Entropy estimation for ADC sampling-based true random number generators[J].IEEE Transactions on Information Forensics and Security, 2019, 14(11):2887-2900.
[18]
CHOI S, SHIN Y, YOO H.Analysis of ring-oscillator based true random number generator on FPGAs[C].2021 International Conference on Electronics, Information, and Communication (ICEIC), IEEE, 2021, 1-3.
[19]
VASILEIADIS N, DIMITRAKIS P, NTINAS V, et al.True random number generator based on multi-state silicon nitride memristor entropy sources combination[C].2021 International Conference on Electronics, Information, and Communication (ICEIC), IEEE, 2021, 1-4.
[20]
CANG S, KANG Z, WANG Z.Pseudo-random number generator based on a generalized conservative Sprott-A system[J].Nonlinear Dynamics, 2021, 104(1):827-844.
[21]
KRISHNAMOORTHI S, JAYAPAUL P, DHANARAJ R K, et al.Design of pseudo-random number generator from turbulence padded chaotic map[J].Nonlinear Dynamics, 2021, 104(2):1627-1643.
[22]
LIU J, LIANG Z, LUO Y, et al.A hardware pseudo-random number generator using stochastic computing and logistic map[J].Micromachines, 2021, 12(1):31.