A Signal Simulator for Multifunctional Electromagnetic Method Receiver Test

Abstract

The invention provides a signal simulator used for multi-functional electromagnetic receiver testing. The signal simulator comprises a signal simulator circuit which is composed of a GPS module, a microcontroller MCU, a rotary switch, a digital compensation crystal MCXO, an on-site programmable gate array FPGA, a chopper circuit, a shaping circuit, a strobe switch, a power supply circuit and a lithium battery. The simulator provided by the invention can carry out 6 kinds of standard of signal output of MT, AMT, CSAMT, SIP, TDIP and TDEM, has the advantages of multiple functions, automatic cycle sweeping, high-precision time synchronization, being portable, low power consumption and easy use, and provides a scheme for indoor and field on-site self-test of a multi-functional electromagnetic receiver.

Description

technical field [0001] The present invention relates to the development of the electromagnetic method instrument in the geophysical instrument, which is used for the indoor and field self-inspection test of the multifunctional electromagnetic receiver. Specifically, it is a signal simulator used for the multifunctional electromagnetic method receiver test. A variety of specific waveforms can be output. Background technique [0002] Electromagnetic method (or electromagnetic induction method) is an important branch of electrical prospecting. This method mainly utilizes the differences in electrical conductivity, magnetic permeability and dielectric properties of rock ore, applies the principle of electromagnetic induction, observes and studies the distribution law (frequency characteristics and time characteristics) of artificial or natural electromagnetic fields, and then solves various related problems. geological problem. [0003] The electromagnetic method is a method o...

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Problems solved by technology

[0006] The above methods have very different requirements for signal output, which are reflected in the signal amplitude, frequency, waveform, time synchronization, and channel selection. However, the existing general-purpose function signal generator can only provide wide-band sine, square, triangle, and modulated waves. Or editable arbitrary waveforms, it is difficult to meet the test requirements in terms of channel number, time synchronization, automatic switching frequency, etc.

[0007] Existing white noise signal generators have limited bandwidth and cannot meet the requirements of broadband MT measurement

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