Method for generating global positioning system (GPS) synchronous control signal detected by electromagnetic method detection

Abstract

The invention relates to a method for generating a global positioning system (GPS) synchronous control signal suitable for electromagnetic method detection, which is used for the synchronization of the generation of the current of an electromagnetic method based transmitter and the reception of the signal of a receiver and suitable for the fields of geophysical exploration, engineering geologicalexploration, and the like. The invention adopts the technical scheme as follows: the transmitter and the receiver receive GPS clock information and second pulse signals, determine a time reference point and calculate sending signal synchronous control starting time, and start the output current of the transmitter through the second pulse narrowing signals when the clock is equal to the sending signal synchronous control starting time. The method has the advantages that the method can eliminate the setting of the synchronous control starting time; for a mixed field source transmitter not required for setting a sending current parameter, the method can omit the keyboard design and simplify the system with reliable use; and for other types of electromagnetic transmitters, a frequency selective switch is only needed to set a frequency, and the operation is quite convenient. The invention is also suitable for occasions where a plurality of transmitters are connected in series and in parallel and a plurality of receivers are combined for use.

Description

technical field [0001] The invention relates to a method for generating a synchronous control signal of a global positioning system for electromagnetic detection, and belongs to the technical field of synchronous generation of electromagnetic transmitter current and receiver signal reception. Background technique [0002] In the field of electromagnetic detection, the transmitter needs to output current, the output current can be unipolar square wave, bipolar square wave, sine wave, AC square wave, periodic multi-frequency sine wave, and the receiver collects the response from the geological body Signal, the receiver starts receiving according to the cycle of the sending current and the sending time, and the transmitter and receiver need precise synchronous control signals. [0003] The synchronization methods of the electromagnetic method transmitter and receiver include cable synchronization, wireless communication synchronization, quartz clock synchronization, induction s...

AI Technical Summary

Problems solved by technology

[0004] The shortcomings of the existing technology are: the transmitter and receiver of the electromagnetic method need to set the three parameters of the transmitter current waveform type, cycle and start time before construction, usually through the keyboard or wireless control terminal

The document "Synchronous Data Acquisition Technology of Mixed Field Source Electromagnetic Receiving System, Journal of Jilin University (Information Science Edition), March 2009, Volume 27, No. 2" proposed the synchronization technology of mixed field source electromagnetic detection system based on GPS, but did not describe And the method of determining the start time of synchronous control

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