CN111221045A - Working parameter optimization method for frequency domain conduction electrical method three-dimensional exploration of exploration abnormal area - Google Patents
Working parameter optimization method for frequency domain conduction electrical method three-dimensional exploration of exploration abnormal area Download PDFInfo
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Abstract
A working parameter optimization method for frequency domain conduction electrical method three-dimensional exploration of an exploration abnormal area. The method obtains the optimized working parameters of the frequency domain conductivity method through a specific formula, such as the survey area range, the point distance, the line distance, the power supply point distance, the number of power supply points, at least the selected total number of channels of an electrical method instrument receiver and the like by analyzing the distribution condition of the survey abnormal area, the terrain grade of the survey area, the device type of the frequency domain conductivity method, the number of channels simultaneously supplied with power by a transmitter, the designed survey depth, the minimum size requirement of the length, the width and the thickness of an electrical abnormal body to be surveyed, the electrical difference between the electrical abnormal body to be surveyed and surrounding rocks, the survey time requirement coefficient and the like. The method can obtain better working parameters of the frequency domain conduction electrical method, thereby obtaining reliable exploration effect in more reasonable time and economic cost. The method is suitable for exploration work in an exploration area with more abnormal bodies and less known information.
Description
Technical Field
The invention relates to a novel optimization method for conducting electrical method three-dimensional exploration working parameters of an exploration abnormal area in the exploration geophysical field.
Background
At present, the working parameters of the frequency domain conduction electrical prospecting method are generally roughly estimated and selected by prospecting workers based on respective experiences and general knowledge of the prospecting region conditions, and due to the fact that the experiences of the prospecting workers and the general condition of the prospecting region are estimated and the like, the working parameter selection in the prospecting is high in randomness, a unified measuring scale is lacked, and too much or too little exploration workload is easily caused. The problems of workload waste, high exploration cost, low efficiency and the like are easily caused when the exploration workload is excessive; if the exploration workload is too small, the problems that the exploration effect is difficult to meet the exploration target requirement, the exploration target body is lost and the like are easily caused. How to effectively solve the problem of working parameter design of specific exploration work and to be used as a specific guide of actual exploration work becomes necessary.
The invention content is as follows:
the invention is based on the problems existing in the working parameter selection of the conventional frequency domain conduction electrical prospecting method, and obtains the working parameters after the frequency domain conduction electrical prospecting method is optimized through a specific formula, such as the prospecting area range, the point distance, the line distance, the power supply point distance, the number of the power supply points, at least the total channel number selected by an electrical prospecting instrument receiver and the like by analyzing the information in the aspects of the distribution condition of the prospecting abnormal area, the terrain grade of the prospecting area, the device type of the frequency domain conduction electrical prospecting method, the number of channels for simultaneously supplying power to a transmitter, the designed prospecting depth, the minimum size requirement of the length, the width and the thickness of the electrical abnormal body to be explored, the electrical difference between the electrical abnormal body to be explored and surrounding rocks, the prospecting time requirement coefficient and the. The method can obtain more optimal working parameters of the frequency domain conduction electrical method, so that reliable exploration effects can be obtained in more reasonable time and economic cost, namely, the optimal balance between the exploration cost and the exploration effects is realized. The method is suitable for three-dimensional exploration work in an exploration area with more abnormal bodies and less known information.
A working parameter optimization method for frequency domain conduction electrical method three-dimensional exploration of an exploration abnormal area comprises the following specific steps:
a) collecting the conditions of landforms and features in an exploration area, determining the Terrain level (Terrain _ level) of the exploration area, and determining a Terrain influence parameter K according to a formula (1), wherein K is Terrain-level (1); the determination of the terrain grade of the exploration area can be determined by adopting corresponding exploration standards or specifications, such as preferably according to the terrain grade division standard about physical exploration in the geological survey project budget standard issued by the Chinese geological survey office in 10 months 2009.
b) Collecting the horizontal Length and the horizontal width of an Abnormal area distribution range in the exploration area (the horizontal Length of the Abnormal area distribution range is Absormal _ Length, which means the horizontal connecting line Length of an Abnormal area where an electrical Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than 0; the horizontal Width of the distribution range of the Abnormal regions is Absormal _ Width, which refers to the horizontal connecting line Width of the Abnormal regions where electrical Abnormal bodies possibly exist, and the unit is meter, and the Absormal _ Width is more than 0);
c) collecting exploration depth (surveying _ depth, unit is meter, surveying _ depth >0) of an exploration area design; namely, the distribution of the electrical abnormal bodies in the exploration depth range of how many meters in the exploration area needs to be known is determined. Preferably, the exploration area is designed to have an exploration depth (exploration _ depth) of 1000 meters or less.
d) Collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of an electrical anomaly to be explored in an exploration area (the minimum horizontal Length of the electrical anomaly to be explored is Body _ Length unit which is meter, and Body _ Length is more than 0; the minimum horizontal Width of the electrical anomaly Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the electrical anomaly to be explored is Body _ Thick, which is measured in meters and is greater than 0; ) (ii) a The electrical anomaly to be explored means that the minimum electrical anomaly of a large scale is sought in an exploration area; since the form of the electrical anomaly actually existing in the exploration area is generally irregular and belongs to unknown information, it is assumed that the electrical anomaly to be searched is a regular cuboid, and the minimum size of the length, width and thickness of the electrical anomaly is defined. Preferably, the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness of the electrical anomaly to be detected are all greater than or equal to 1 meter.
e) Collecting the Electrical parameter values of the Electrical anomaly body to be explored in the exploration area and the Electrical parameter values of the surrounding rocks, and calculating the ratio (Electrical _ ratio, dimensionless) of the Electrical parameter values of the Electrical anomaly body to be explored and the Electrical parameter values of the surrounding rocks, wherein the Electrical _ ratio is equal to the ratio of the Electrical parameter values of the Electrical anomaly body to be explored and the Electrical parameter values of the surrounding rocks, the Electrical parameter types of the Electrical anomaly body to be explored and the Electrical parameter values of the surrounding rocks are the same, the Electrical _ ratio is not equal to 1, and the Electrical _ ratio is greater than 0; preferably, the electrical parameters of the electrical anomaly body to be explored and the surrounding rock are determined by testing the electrical property of the corresponding specimen; if the electrical parameter of the electrical anomaly body to be explored has a plurality of test results, calculating the average value of the electrical parameter of the electrical anomaly body to be explored; if the electrical parameters of the surrounding rock have a plurality of test results, the average value of the electrical parameters of the surrounding rock is obtained; and if the corresponding electrical anomaly body and the samples of the surrounding rocks cannot be acquired temporarily in the exploration area, estimating the electrical parameters of the electrical anomaly body and the surrounding rocks in the area by combining the data in the early stage of the exploration area and integrating the electrical parameters of the corresponding lithologic samples in other areas, and taking the estimated values as corresponding electrical numerical values. The electrical anomaly body and the surrounding rock are required to have obvious electrical difference so that the electrical anomaly body and the surrounding rock can be distinguished obviously through electrical prospecting work.
f) Collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement (Time, unit is day, Time >0) for completing exploration work; preferably, the exploration time requirement factor is equal to or greater than 0.1 days. Because some exploration areas (such as cities) have strict requirements on exploration efficiency and exploration time, it is desirable to complete related exploration work as soon as possible so as to evaluate electrical anomalies as soon as possible and minimize interference of exploration work on human activities in the exploration areas.
g) Collecting the Number of channels (Number _ Transmit, unit is one, Number _ Transmit >0) for simultaneously supplying power to the transmitter of the selected frequency domain conduction electrical method instrument; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter; preferably, the number of channels for simultaneously supplying power to the transmitter of the frequency domain conduction electrical instrument is greater than or equal to 1. Preferably, the transmitter of the frequency domain conducted electrical instrument can Transmit 1 or more single-frequency signals at the same time, i.e. (Number _ Transmit ≧ 1); the receiver of the frequency domain conduction electrical method instrument can simultaneously receive all signals simultaneously sent by the transmitter; the number of the single frequencies transmitted by the transmitter is the same as the number of the single frequencies received by the receiver; the frequency value that the sender can send is the same as the frequency value that the receiver can receive; that is, if the transmitter can simultaneously transmit n single-frequency signals, the receiver can also simultaneously receive n single-frequency signals. The instrument can simultaneously send or receive a plurality of single-frequency electric signals, thereby improving the exploration efficiency, reducing the exploration cost, and meeting the requirements of time and other aspects of a special exploration area.
h) Determining the TYPE of the electrical prospecting device selected in the prospecting work and assigning a value (ARRAY _ TYPE), wherein the ARRAY _ TYPE of the two-pole device is 3, the ARRAY _ TYPE of the three-pole device is 2, and the ARRAY _ TYPE of the four-pole device is 1; and selecting the type of the electrical prospecting device according to the specific requirements of the prospecting area, and assigning values according to the type of the device.
i) Calculating the working parameters after the frequency domain conduction electrical method optimization by adopting a formula (2), wherein the working parameters comprise the horizontal Length and the horizontal width of an Exploration area range (the horizontal Length of the Exploration area is the Exploration _ Length, the unit is meter, and the Exploration _ Length is more than 0; the horizontal Width of the Exploration area is expansion _ Width which is measured in meters and is greater than 0), the horizontal point distance of a measuring point (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of a measuring Line (Line _ Space which is measured in meters and is greater than 0), the horizontal distance of a power Supply point (Supply _ Space which is measured in meters and is greater than 0), the Number of the power Supply points (Supply _ Number which is measured in meters and is greater than 0), the minimum total Number of selected frequency domain conduction electric method receivers (Number _ Measure which is measured in tracks and is greater than 0);
wherein MAX () is a function that finds the maximum of the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
j) and (3) acquiring the optimized working parameters of the frequency domain conduction electrical method according to the formula (2), developing the frequency domain conduction electrical method exploration work of the exploration area, acquiring frequency domain conduction electrical method exploration data, and performing data processing and interpretation to obtain an exploration result. By adopting the optimized working parameters, the method can meet various special requirements of exploration work on an exploration area with more abnormal bodies and less known information, thereby realizing the purpose of obtaining reliable exploration results with lower time, economy and other costs.
Description of the drawings:
FIG. 1 is a flow chart of a method for optimizing working parameters of frequency domain conducted electrical three-dimensional exploration of an exploration abnormal area according to the present invention;
the specific implementation mode is as follows:
the invention is further described with reference to the following detailed description of the invention with reference to fig. 1.
a) Collecting the situations of landform, landform and features in an exploration area, determining the landform level (Tertain _ level) of the exploration area according to a landform level division standard about physical exploration in a geological survey project budget standard issued by the Chinese geological survey bureau in 10 months 2009, and determining a landform influence parameter K, wherein K is Tertain-level (1) according to a formula (1); assuming that the Terrain grade of a certain exploration area is determined to be 1 grade according to the Terrain grade division standard about physical exploration in the geological survey project budget standard issued in 10 months in 2009, namely Terrain _ level is 1, then K is 1;
b) collecting the Length of the horizontal projection and the width of the horizontal projection of an Abnormal area distribution range in the exploration area (the Length of the horizontal projection of the Abnormal area distribution range is Absormal _ Length, which means the Length of the horizontal projection of an Abnormal area where an electrical Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than 0; the Width of the horizontal projection of the Abnormal region distribution range is Absormal _ Width, which refers to the Width of the horizontal projection of the Abnormal region where an electric Abnormal body possibly exists, and the unit is meter, and the Absormal _ Width is more than 0); assuming that the Length of the horizontal projection of the Abnormal region distribution range in the certain exploration region selected in the step a) is 500 meters, and the Width of the horizontal projection is 300 meters, then the Abnormal _ Length is 500 (meters), and the Abnormal _ Width is 300 (meters);
c) collecting the exploration depth (surveying _ depth, unit is meter) of the exploration area design, and assuming that the exploration depth of a certain exploration area selected in the step a) is limited to 100 meters, the surveying _ depth is 100 meters;
d) collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of an electrical anomaly to be explored in an exploration area (the minimum horizontal Length of the electrical anomaly to be explored is Body _ Length unit which is meter, and Body _ Length is more than 0; the minimum horizontal Width of the electrical anomaly Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the electrical anomaly to be explored is Body _ Thick, in meters, Body _ Thick > 0); assuming that a certain exploration area selected in the step a) wants to know resistivity anomaly existing in the exploration area, wherein the resistivity anomaly has a horizontal Length of at least 100 meters, a horizontal Width of at least 50 meters and a vertical thickness of at least 5 meters, then Body _ Length is 100 meters, Body _ Width is 50 meters and Body _ Thick is 5 meters;
e) collecting the Electrical property ratio (Electrical _ ratio) of the Electrical anomaly to be explored to the surrounding rock, wherein the Electrical _ ratio is equal to the ratio of the Electrical property of the Electrical anomaly to be explored to the Electrical property of the surrounding rock, and the Electrical _ ratio is not equal to 1 and is dimensionless; assuming that a certain exploration area selected in the step a) is expected to judge and evaluate the underground abnormal body through the resistance rate parameters, and obtaining that the resistivity of the resistivity abnormal body to be explored is 50 omega-m, the resistivity of the surrounding rock is 500 omega-m and the resistivity ratio of the resistivity abnormal body to the surrounding rock is 0.1 according to the sample test result, namely, the exploration area is expected to search for the low-resistance abnormal body relative to the surrounding rock, and then the Electrical _ ratio is 50/500-0.1;
f) collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement (Time, unit is day) for completing the exploration work; assuming that the frequency domain conducted electrical prospecting work of a certain prospecting area selected in the step a) is expected to be completed within 2 days, the Time is 2 days;
g) collecting the Number of channels (Number _ Transmit, unit is one, Number _ Transmit >0) for simultaneously supplying power to the transmitter of the selected frequency domain conduction electrical method instrument; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter; preferably, the number of channels for simultaneously supplying power to the transmitter of the frequency domain conduction electrical instrument is greater than or equal to 1. Preferably, the transmitter of the frequency domain conducted electrical instrument is capable of transmitting 1 or more single frequency signals simultaneously; the receiver of the frequency domain conduction electrical method instrument can simultaneously receive all signals simultaneously sent by the transmitter; the number of the single frequencies transmitted by the transmitter is the same as the number of the single frequencies received by the receiver; the frequency value that the sender can send is the same as the frequency value that the receiver can receive; that is, if the transmitter can simultaneously transmit n single-frequency signals, the receiver can also simultaneously receive n single-frequency signals. The instrument can simultaneously send or receive a plurality of single-frequency electric signals, thereby improving the exploration efficiency, reducing the exploration cost, and meeting the requirements of time and other aspects of a special exploration area. Assuming that the Number of channels simultaneously powered by the transmitter of the frequency domain conduction electrical method instrument selected by the exploration work of the certain exploration area selected in the step a) is 5, the Number _ Transmit is 5; the receiver of the frequency domain conduction electrical instrument can also receive 5 signals simultaneously.
h) Determining the TYPE of the electrical prospecting device selected in the prospecting work and assigning a value (ARRAY _ TYPE), wherein the ARRAY _ TYPE of the two-pole device is 3, the ARRAY _ TYPE of the three-pole device is 2, and the ARRAY _ TYPE of the four-pole device is 1; assuming that the TYPE of the frequency domain conduction electrical prospecting working device of the certain prospecting area selected in the step a) is a quadrupole device, the ARRAY _ TYPE is 1;
i) according to the relevant data of the steps, acquiring the working parameters after the frequency domain conduction electrical method optimization by adopting a formula (2), wherein the working parameters comprise the horizontal Length and the horizontal width of an Exploration area (the horizontal Length of the Exploration area is application _ Length, and the unit is meter; the horizontal Width of the Exploration area is application _ Width, the unit of which is meter), the horizontal point distance of a measuring point (Station _ Space, the unit of which is meter), the horizontal Line distance of a measuring Line (Line _ Space, the unit of which is meter), the horizontal distance of a power Supply point (Supply _ Space, the unit of which is meter), the Number of the power Supply points (Supply _ Number, the unit of which is meter), and the minimum total Number of channels (Number _ Measure, the unit of which is channel) of the selected frequency domain conduction electrical method instrument;
(2) (ii) a Substituting the correlation data of the above steps into formula (2), thereby obtaining the following operating parameters:
that is, if the horizontal length of the abnormal area within the range of 100 meters buried depth within the range of 500 meters by 300 meters is not less than 100 meters, the horizontal width is not less than 50 meters, and the horizontal thickness is not less than 5 meters (Electrical _ ratio is 0.1), then the exploration range of 1000 meters by 600 meters, the point distance is 17 meters, the line distance is 34 meters, the distance between the power supply points is 15 meters, the number of the power supply points is 1177, and the number of channels for supplying power to the transmitter at the same time is 5, the frequency domain of the quadrupole device is selected to conduct the Electrical exploration work, the minimum total number of the frequency domain conduction Electrical instrument is 611 channels, thereby the exploration work can be completed within 2 days;
j) and according to the obtained working parameters after the frequency domain conduction electrical method optimization, carrying out frequency domain conduction electrical method exploration work of an exploration area, obtaining frequency domain conduction electrical method exploration data, and carrying out data processing and interpretation to obtain exploration results. By adopting the optimized working parameters, various special requirements of an exploration area on the exploration work can be met, and therefore a reliable exploration result can be obtained with lower time, economy and other costs.
The above description is only exemplary of the invention and should not be taken as limiting, since any modifications, equivalents, improvements and the like, which are within the spirit and principle of the invention, are intended to be included therein.
Claims (7)
1. A working parameter optimization method for frequency domain conduction electrical method three-dimensional exploration of an exploration abnormal area comprises the following specific steps:
a) collecting the landform and feature conditions of an exploration area, determining the landform grade (Terrain _ level) of the exploration area, and determining a landform influence parameter K according to a formula (1), wherein K is Terrain-level (1);
b) collecting the Length of the horizontal projection and the width of the horizontal projection of an Abnormal area distribution range in the exploration area (the Length of the horizontal projection of the Abnormal area distribution range is Absormal _ Length, which means the Length of the horizontal projection of an Abnormal area where an electrical Abnormal body possibly exists, and the unit is meter, and Absormal _ Length is greater than 0; the Width of the horizontal projection of the Abnormal region distribution range is Absormal _ Width, which refers to the Width of the horizontal projection of the Abnormal region where an electric Abnormal body possibly exists, and the unit is meter, and the Absormal _ Width is more than 0);
c) collecting exploration depth (surveying _ depth, unit is meter, surveying _ depth >0) of an exploration area design;
d) collecting the size requirements of the minimum horizontal Length, the minimum horizontal width and the minimum vertical thickness of an electrical anomaly to be explored in an exploration area (the minimum horizontal Length of the electrical anomaly to be explored is Body _ Length unit which is meter, and Body _ Length is more than 0; the minimum horizontal Width of the electrical anomaly Body to be explored is Body _ Width, the unit is meter, and the Body _ Width is more than 0; the minimum vertical thickness of the electrical anomaly to be explored is Body _ Thick, in meters, Body _ Thick > 0);
e) collecting the ratio of Electrical parameters (Electrical _ ratio, dimensionless) of an Electrical anomaly body to be explored and a surrounding rock in an exploration area, wherein the Electrical _ ratio is equal to the ratio of the Electrical parameter value of the Electrical anomaly body to be explored to the Electrical parameter value of the surrounding rock, the Electrical parameter types of the Electrical anomaly body to be explored and the Electrical parameter value of the surrounding rock are the same, the Electrical _ ratio is not equal to 1, and the Electrical _ ratio is greater than 0;
f) collecting exploration time requirement coefficients of an exploration area; the exploration Time requirement coefficient refers to the whole field data acquisition Time requirement (Time, unit is day, Time >0) for completing exploration work;
g) collecting the Number of channels (Number _ Transmit, unit is one, Number _ Transmit >0) for simultaneously supplying power to the transmitter of the selected frequency domain conduction electrical method instrument; the number of channels for supplying power to the transmitters simultaneously refers to the number of channels for supplying power to the transmitters of the frequency domain electrical conduction method instruments simultaneously, and the frequency of signals supplied by each channel is different from one another; the receiver of the corresponding frequency domain conduction electrical instrument can simultaneously receive all frequency signals simultaneously supplied by the transmitter;
h) determining the TYPE of the electrical prospecting device selected in the prospecting work and assigning a value (ARRAY _ TYPE), wherein the ARRAY _ TYPE of the two-pole device is 3, the ARRAY _ TYPE of the three-pole device is 2, and the ARRAY _ TYPE of the four-pole device is 1;
i) calculating the working parameters after the frequency domain conduction electrical method optimization by adopting a formula (2), wherein the working parameters comprise the horizontal Length and the horizontal width of an Exploration area range (the horizontal Length of the Exploration area is the Exploration _ Length, the unit is meter, and the Exploration _ Length is more than 0; the horizontal Width of the Exploration area is expansion _ Width which is measured in meters and is greater than 0), the horizontal point distance of a measuring point (Station _ Space which is measured in meters and is greater than 0), the horizontal Line distance of a measuring Line (Line _ Space which is measured in meters and is greater than 0), the horizontal distance of a power Supply point (Supply _ Space which is measured in meters and is greater than 0), the Number of the power Supply points (Supply _ Number which is measured in meters and is greater than 0), the minimum total Number of selected frequency domain conduction electric method receivers (Number _ Measure which is measured in tracks and is greater than 0);
wherein MAX () is a function that finds the maximum of the values; ROUNDUP () is a rounding up function; log10() represents the base-10 logarithm; | | represents an absolute value function;
j) and (3) acquiring the optimized working parameters of the frequency domain conduction electrical method according to the formula (2), developing the frequency domain conduction electrical method exploration work of the exploration area, acquiring frequency domain conduction electrical method exploration data, and performing data processing and interpretation to obtain an exploration result.
2. The method of claim 1, wherein the method comprises the steps of: preferably, the Terrain grade (Terrain _ level) of the exploration area is determined according to a Terrain grade division standard about physical exploration in "geological survey project budget standard" promulgated by the chinese geological survey office in 10 months 2009.
3. The method of claim 1, wherein the method comprises the steps of: preferably, the exploration area is designed to have an exploration depth (exploration _ depth) of 1000 meters or less.
4. The method of claim 1, wherein the method comprises the steps of: preferably, the minimum horizontal length, the minimum horizontal width and the minimum vertical thickness of the electrical anomaly to be detected are all more than or equal to 1 meter.
5. The method of claim 1, wherein the method comprises the steps of: preferably, the electrical parameters of the electrical anomaly body to be explored and the surrounding rock are determined by testing the electrical parameters of the corresponding specimen; if the electrical parameter of the electrical anomaly body to be explored has a plurality of test results, calculating the average value of the electrical parameter of the electrical anomaly body to be explored; if the electrical parameters of the surrounding rock have a plurality of test results, the average value of the electrical parameters of the surrounding rock is obtained; the electrical parameter types of the electrical anomaly body to be explored and the surrounding rock are the same.
6. The method of claim 1, wherein the method comprises the steps of: preferably, the exploration time requirement factor is equal to or greater than 0.1 days.
7. The method of claim 1, wherein the method comprises the steps of: preferably, the transmitter of the frequency domain conducted electrical instrument is capable of transmitting 1 or more single frequency signals simultaneously; the receiver of the frequency domain conduction electrical method instrument can simultaneously receive all signals simultaneously sent by the transmitter; the number of the single frequencies transmitted by the transmitter is the same as the number of the single frequencies received by the receiver; the frequency value that the transmitter can transmit is the same as the frequency value that the receiver can receive.
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2020
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| SU1701046A3 (en) * | 1990-02-12 | 1995-06-27 | Бубнов Валерий Павлович | Method of geological survey |
| US20150006081A1 (en) * | 2013-07-01 | 2015-01-01 | Subsurface Insights LLC | Adaptive time-lapse sub-surface electrical resistivity monitoring |
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