Wired Cascade Electromagnetic Data Acquisition System and Measurement Method

Abstract

The invention discloses a wired cascade type electromagnetic data acquisition system and a measuring method thereof. The wired cascade type electromagnetic data acquisition system comprises a main control station and multiple acquisition stations. The multiple acquisition stations are connected with each other by use of a wired cascade mode to form linear arrangement; when the main control station is connected with any one of the multiple acquisition stations, the acquisition station is upgraded to be a gathering station for transferring data and commands of the main control station and the other acquisition stations; the main control station queries a network address from each acquisition station through the gathering station to determine the network topology structure of the system so as to obtain route information, establish a route and utilize the route to control each acquisition station to synchronously acquire electromagnetic data through a network; each acquisition station, while synchronously acquiring the electromagnetic data, actively transmits the acquired electromagnetic data to an upper acquisition station or the gathering station through the route; and the main station finishes data storage after receiving the data transmitted by each acquisition station. With such a system and measuring method provided by the invention, long-distance acquisition station networking with consistent measuring line directions is realized, the expansion is flexible, the net work connection is reliable, the transmission rate is high, and the data monitoring points are variable, thus field construction is facilitated.

Description

technical field [0001] The invention relates to an electromagnetic acquisition device and a measuring method thereof in geophysical prospecting. It is especially suitable for long-distance synchronous three-dimensional observation mode in electromagnetic prospecting. Background technique [0002] Geophysical prospecting (referred to as "geophysical prospecting") is a method of using physical principles to study geological structures and solve problems in prospecting and prospecting. It is based on the differences in physical properties such as density, magnetism, electricity, elasticity, and radioactivity of various rocks and ores, and uses different physical methods and geophysical instruments to detect changes in natural or artificial geophysical fields. , Inferring and interpreting the geological structure and mineral distribution based on the geophysical prospecting data obtained by the research. At present, the main geophysical prospecting methods are: gravity prospec...

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Problems solved by technology

However, most of the above studies are based on the collection station itself, and the collection station mostly adopts the traditional single-station independent working mode, that is, there is no connection between each collection device, and each works independently, independently collecting, recording and preprocessing data , such as TerraTEM in Australia, EH-4 from Geometrics in the United States, V5 and V6 multifunctional electrical instruments produced by Phoenix Geophysics in Canada; GDP32 multifunctional electrical instruments produced by Zonge in the United States; MT-24NS produced by EMI in the United States, etc. , this type of instrument is not suitable for synchronous electromagnetic data acquisition with large depth and long survey line

Although there are a small number of electromagnetic data acquisition systems using a distributed and simple network structure in the above researches, such systems mostly use the data acquisition method of the master-slave mode, such as the V8 distributed multi-function electrical instrument produced by the Phoenix Geophysics Corporation of Canada. , the number of slaves is at most 5, and the wireless channel distance is less than 200 meters. Therefore, although this type of acquisition equipment has preliminary scalability, its expansion ability is still poor, and it still cannot meet the requirements of synchronous electromagnetic systems with large depths and long survey lines. Data collection pattern requirement; Other similar or related products, literature also once proposed to adopt the data observation mode of wireless network and by point-to-multipoint wireless communication mode (as AGE-xxl), and system of the present invention is comparatively close, but its There are still problems such as short communication distance and low data rate. The detailed analysis is as follows

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