A Preliminary Study on CSAMT Anti-Jamming Transmitter System

Abstract:

On the basis of the relevant identification theory of pseudo-random code signal, the signals of CSAMT are divided into three parts according to the frequency of the signal. The signals which are susceptible to 50Hz interference signal and its harmonic components should be set by pseudo-random code way. Others are set by single square waveform way. The Control and signal generation software of the transmitter system is built on the advanced virtual instrument platform, LabVIEW. The hardware of the transmitter system is mainly composed of host computer, data acquisition card, high-speed optocoupler, IGBT driver module and four IGBT switches. The data acquisition card generate PWM signals, the high-speed optocoupler isolates low-voltage part and high-voltage part. IGBT drive module and four IGBT switches constitute high-voltage part. Entire transmitter system is suitable for different environments and research tasks, the transmit frequency are adjustable, and the pseudo-random code signal has strong capability to suppress the interference signals. The control software on host computer is simple and clear. There is good prospect for the use.

• Periodical: Advanced Materials Research (Volumes 962-965)
• Pages: 317-321
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.962-965.317
• Online since: June 2014
• Authors: Dang Li*, Jun Lu Wang, Yong Li, Jian Hua Li, Pin Rong Lin
• Keywords: Csamt, IGBT, L Sequence, LabVIEW

References

[1] Routh P S, Oldenburg D W: Inversion Of Controlled Source Audio-Frequency Magnetotellurics Data For A Horizontally Layered Earth. Geophysics, Vol. 64 No. 6 (1999), p.1689.

DOI: 10.1190/1.1444673

[2] Lu X Y, Unsworth J M, Booker J: Rapid Relaxation Inversion Of CSAMT Data. Geophysical Journal International, Vol. 138 No. 2(1999), p.381.

DOI: 10.1046/j.1365-246x.1999.00871.x

[3] Lin C H, Tan H D, Shu Q: Three-Dimensional Conjugate Gradient Inversion Of CSAMT Data. Chinese Journal Of Geophysics, Vol. 55 No. 11(2012), p.3829. (In Chinese).

[4] Liu Y G, Dong H B, Liu X J, He Z X: Preliminary Study Of Electrical Prospecting Based on m Sequence. Chinese Journal Of Engineering Geophysics, Vol. 7 No. 2(2010), p.159. (In Chinese).

[5] Tang J T, Li F, Luo W B: Electrical Fine-Exploration Transmitter Design Based on Invert-Repeated m-Sequence, Progress In Geophysics, Vol. 22 No. 3(2007), p.994. (In Chinese).

[6] Tang J T, Gong J Z，Luo W B: Invert-Repeated m-Sequence Pseudorandom Signal Generator Based on CPLD. Chinese Journal Of Engineering Geophysics, Vol. 5 No. 2(2008), p.141. (In Chinese).

[7] Tang J T , Luo W B: Pseudo-Random Electromagnetic Exploration Based on Invert-Repeated m-Sequence Correlation Identification. Chinese Journal Of Geophysics, Vol. 51 No. 4(2008), p.1226. (In Chinese).

[8] Luo W B, Li Q C, Tang J T: Coded Source Electromagnetic Sounding Method. Chinese Journal Of Geophysics, Vol. 55 No. 1(2012), p.341. (In Chinese).

[9] Information on http: /sine. ni. com/nips/cds/view/p/lang/zhs/nid/203190(In Chinese).

[10] Dan G W, Shen J F, Yan W X, Hui J: Drive and Protection Capability Analysis Of 2SD315A Integrated Driver. Journal Of Southern Yangtze University(Natural Science Edition), Vol. 5 No. 3(2006), p.317. (In Chinese).

[11] Tian Q, Jiang P, Wang C W, Qin W D, Liu H W: Applications Of 2SD315A in High Voltage Repetitive Frequency Power Supply. Ordnance Industry Automation, Vol. 29 No 5(2010), p.83. (In Chinese).