CN107329175A - One kind archaeology magnetic gradient vector detection system and method - Google Patents

Abstract

The invention discloses an archaeological magnetic gradient vector detection system and method, comprising a host, a non-magnetic trolley and a sensor system; the host includes a main control board, a communication device and a data recorder; the front end of the non-magnetic trolley has four The magnetic gradiometer probe rod (1) on the ground, two fluxgate probes with different heights are installed on each magnetic gradiometer probe rod (1), and the two fluxgate probes on each rod form a fluxgate gradient Magnetometer, after collecting the magnetic gradient data by two fluxgate probes with different heights, the data collected by the probes at different heights is subtracted to obtain the gradient data, the magnetic data collected by the data acquisition instrument and the two fluxgates on each rod The data correspond to each other, and the four magnetic gradiometer probe rods will simultaneously collect four sets of fluxgate gradiometer data. The device is simple in operation, low in work cost, high in efficiency, and highly intelligently integrated, can effectively reduce the cost of archaeological work, improve the quality of magnetic survey data, and is suitable for the application of large-area archaeological survey work.

Description

An archaeological magnetic gradient vector detection system and method

technical field

The invention relates to a magnetic gradient detection system and method applied in the archaeological field, and belongs to the technical field of new geophysical prospecting instruments.

Background technique

Magnetic archaeology is a new application field developed by magnetic detection in recent years. It is a geophysical detection method that studies the burial characteristics and distribution of detection targets by observing and analyzing the magnetic anomalies caused by the magnetic differences in the detection area. The application in archaeological work includes: ① Determine the specific location of the detection target. In archaeological work, the specific location of the detection target is usually difficult to determine. The traditional method is to use Luoyang shovel for manual drilling detection, but Luoyang shovel drilling detection Not only is the detection efficiency low, but it is also destructive to the detection target, especially in the arid region of the west, where the area is wide, and the traditional Luoyang shovel drilling detection workload is huge. ② Determine the range and distribution of detection targets. In archaeological work, staff usually obtain the approximate range and distribution of detection targets through the analysis of historical documents, ancient maps, and old aerial photographs. Long time and low accuracy. ③ Determine the burial depth of the detection target. The burial depth of the detection target is usually estimated by the staff based on experience, and the ground magnetic survey can calculate the burial depth of the detection target more accurately through the forward modeling and inversion of the data. Magnetic prospecting can also be used to study deep geological structures, estimate the depth of the Curie point to study geothermal energy, and carry out research on seismic seismosphere analysis and earthquake prediction. In the prospecting work, it can determine the location of the drilling hole and guide the drilling work, and it can also be used to find underground metal pipelines and other work.

Existing archaeological exploration work is complex in operation, high in work cost, low in efficiency, and low in intelligence integration.

Contents of the invention

Aiming at the disadvantages of complex operation, high work cost, low efficiency and low level of intelligent integration in the existing archaeological detection work, the present invention proposes an archaeological magnetic measurement system using a non-magnetic trolley as a platform, which can effectively reduce the cost of archaeological work and improve The quality of magnetic survey data is suitable for the application of large-area archaeological survey work.

The present invention is achieved through the following technical solutions.

An archaeological magnetic gradient vector detection system, including a host, a non-magnetic car and a sensor system; the host includes a main control board, a communication device and a data recorder; the sensor system includes a non-magnetic car for measuring the position, air pressure, temperature and magnetic field value The measurement sensor; the sensor used for the position measurement of the non-magnetic car includes GPS, and the altimeter; the data obtained by the GPS is used for the post-data magnetic compensation and the magnetic anomaly positioning, and the positioning is performed according to the GPS data after the magnetic anomaly is found; the data obtained by the altimeter It is mainly used for post-data magnetic compensation; barometer and thermometer respectively measure the air pressure value and temperature value of the current position of the non-magnetic car; the sensor used for magnetic field value measurement is a fluxgate gradient magnetometer, and the multi-channel fluxgate gradient magnetometer is installed On the magnetic gradiometer probe rod (1) at the front end of the non-magnetic trolley, away from the host and communication equipment to reduce various magnetic interference from the car body; there are four magnetic gradients at the front of the non-magnetic trolley with adjustable spacing and perpendicular to the ground Two fluxgate probes with different heights are installed on each magnetic gradiometer probe rod (1), and the two fluxgate probes on each rod form a fluxgate gradient magnetometer. After two fluxgate probes with different heights collect the magnetic gradient data, the data collected by the probes with different heights are subtracted to obtain the gradient data. The magnetic data collected by the data acquisition instrument corresponds to the two fluxgate data on each rod. , the four magnetic gradiometer probe rods will simultaneously collect four sets of fluxgate gradiometer data.

In the archaeological magnetic gradient vector detection system, the non-magnetic trolley includes a magnetic gradiometer probe rod (1), a front beam (2), a diagonal brace (3), a spoke type non-magnetic wheel (4), a tripod suspension (5 ), stand (6), handrail (7); two spoke-type non-magnetic wheels (4) are in total connected with the wheel hubs (10) at both ends of the wheel crossbeam (13) by bolts; the tripod suspension (5) is An isosceles triangular bracket made of detachable aluminum alloy profiles, the apex of the isosceles triangular bracket is detachably connected to the wheel beam (13), and the two ends of the bottom edge of the isosceles triangular bracket are detachably connected to the stand (6 ), the front portion of the stand (6) is detachably provided with a front beam (2), and the front beam (2) is detachably connected to one end of the magnetic gradiometer probe rod support rod (12) vertically, and the magnetic gradiometer probe rod support rod ( The other end of 12) is connected to the hoop, and the magnetic gradiometer probe rod (1) is detachably connected to the magnetic gradiometer probe rod support rod (12) through the hoop, and the magnetic gradiometer probe rod (1) is kept vertical to the ground; The rear part of the frame (6) is connected with the handrail (7), and the user manipulates the handrail to control the moving direction of the trolley; the end of the handrail close to the user is connected with a display (8) for the user to grasp relevant detection information in real time; the stand (6) The top is detachably connected to the main chassis (9), and the main engine is placed inside; four magnetic gradiometer probe rods (1) are arranged in total, and each magnetic gradiometer probe rod (1) is parallel to each other. The waist and the base of the above-mentioned isosceles triangle support, the non-magnetic profiles of the waist and height, height and base are all detachably connected by oblique connectors (11); Disassemble and connect the diagonal brace (3) to ensure the strength of the front beam (2) and the firmness of the overall structure; the front beam (2), diagonal brace (3), spoke type non-magnetic wheel (4), tripod suspension (5) . The cross-section is a rectangular cross-section, and there are fixed grooves on each side, which is convenient for the connection of various angles between non-magnetic profiles.

In the archaeological magnetic gradient vector detection system, the host is installed in the main box (9) of the non-magnetic trolley, the serial port of the main control board of the host is connected to the fluxgate gradient magnetometer, and the magnetic data is recorded by the data recorder; the air pressure is connected to the serial port. Gauge, altimeter, GPS, thermometer, record the data of each sensor through the data logger, and transmit the data to the host display screen for real-time display. The main control board also provides a time scale signal to make the working time of each sensor consistent with the recording time.

In the archaeological magnetic gradient vector detection system, the host, data acquisition system and sensors are made of non-ferromagnetic materials, and at the same time, ferromagnetic materials cannot be used in the installation process to reduce the magnetization of the car body by the earth's magnetic field. Inductive magnetic interference; a large number of conductive materials such as wires cannot be used between the various modules of the vehicle to reduce the eddy current magnetic interference generated by cutting the geomagnetic field during the measurement process.

In the archaeological magnetic gradient vector detection system, the mainframe realizes the following functions: 1. Check whether the magnetic measurement system is normal, including power supply power check, fluxgate gradient sensor and communication status check; Set the measurement parameters, including sampling frequency, magnetic data acquisition range and sampling mode and other parameter settings; 3. During the measurement work, monitor the measurement status in real time, and the communication device will transmit the acquired magnetic measurement status to the host in real time, and the host will The real-time status of the measurement is displayed. If a certain state of the system is in an abnormal working state, the measurement can be stopped in time to avoid invalid and wrong measurements.

The method for carrying out archaeological magnetic gradient vector detection according to any one of the archaeological magnetic gradient vector detection systems may further comprise the steps:

Step 1: Install the host and on-board sensors on the non-magnetic trolley;

Step 2: Put the low-magnetism trolley equipped with magnetic measuring equipment at the starting point of the area to be tested, turn on the power, start the host control software, and observe whether the power module is working normally;

Step 3: Switch the host control software to the data display interface, observe whether the host and each sensor can communicate normally, and then move the car to observe whether the data change of each sensor is consistent with the actual action of the non-magnetic car;

Step 4: The staff pushes the trolley to keep moving forward at a constant speed until the entire measurement area is measured, and then the power supply can be disconnected;

Step 5: Read the measurement data from the memory card of the host computer and import it into the relevant software AeroMag for processing;

Step 7: In AeroMag, first preprocess the aeromagnetic anomaly data, including normal correction field correction, temperature correction, zero point correction, normal gradient correction, and base point correction;

Step 8: After data preprocessing, process the magnetic anomaly data in AeroMag, including upward continuation, whose main function is to suppress shallow interference and highlight deep trends; vertical derivative, whose main function is to highlight shallow field sources Information; polarized magnetic poles, whose main function is to eliminate the influence of oblique magnetization and simplify the magnetic field form.

The method can also use the frequency domain to process and convert the magnetic anomaly data accordingly, and finally display the graphics in three dimensions.

The device is simple in operation, low in work cost, high in efficiency, and highly intelligently integrated, can effectively reduce the cost of archaeological work, improve the quality of magnetic survey data, and is suitable for the application of large-area archaeological survey work.

Description of drawings

Fig. 1 is the schematic diagram of the non-magnetic trolley gradiometer system of the present invention; 1 magnetic gradiometer probe rod, 2 front beams, 3 diagonal braces, 4 spoke type non-magnetic wheels, 5 tripod suspension, 6 stands, 7 handrails, 8 display instruments, 9 main chassis, 10 wheel hub, 11 bevel connector, 12 magnetic gradiometer probe rod support rod, 13 wheel beam;

Figure 2 is two groups of magnetic gradient data diagrams, the solid line is the magnetic gradient data diagram of one of the rods, and the dotted line is the magnetic gradient data diagram of the other rod;

Figure 3 is the contour map of the magnetic gradient of the ancient city of Luntai, Xinjiang;

Fig. 4 is the magnetic gradient value figure of straight line among Fig. 3;

detailed description

The present invention will be described in detail below in conjunction with specific embodiments.

The archaeological magnetic gradient vector detection system includes a host, a non-magnetic trolley and a sensor system.

The host includes a main control board, a communication device and a data logger. The host adopts a highly stable embedded system, and its volume and weight should be as small and light as possible. The main control board provides a time scale signal to make the working and recording time of each sensor consistent; the main control board is connected with the communication device, and the output is respectively connected to the data recorder and the sensor system.

The sensor system includes sensors for the measurement of the position, air pressure and temperature of the non-magnetic trolley and the measurement of the magnetic field value. The sensors used to measure the position of the non-magnetic trolley include GPS and altimeter; the data acquired by GPS is used for post-data magnetic compensation and magnetic anomaly positioning, that is, after the magnetic anomaly is found, it needs to be positioned according to GPS data. The data obtained by the altimeter is mainly used for post-data magnetic compensation; the barometer and thermometer respectively measure the air pressure value and temperature value of the current position of the non-magnetic car, and the sensor used for magnetic field value measurement is a fluxgate gradient magnetometer.

The non-magnetic trolley is the installation platform of the entire magnetic measurement system. Refer to Figure 1, including the magnetic gradiometer probe rod 1, the front beam 2, the diagonal brace 3, the spoke type non-magnetic wheel 4, the tripod suspension 5, the stand 6, and the handrail 7; There are two spoke-type non-magnetic wheels 4, which are detachably fixedly connected with the wheel hubs 10 at both ends of the wheel beam 13; the tripod suspension 5 is an isosceles triangle bracket formed by detachable aluminum alloy profiles, and the top angle Detachably connected to the wheel crossbeam 13, the two ends of the base of the isosceles triangle bracket are detachably connected to the stand 6, the front part of the stand 6 is detachably provided with the front crossbeam 2, and the front end crossbeam 2 is detachably connected vertically to the magnetic gradient One end of the instrument rod support rod 12, the other end of the magnetic gradiometer probe rod support rod 12 is connected to the hoop, the magnetic gradiometer probe rod 1 is detachably connected to the magnetic gradiometer probe rod support rod 12 through the hoop, and the magnetic gradiometer The probe rod 1 is kept vertical to the ground; the rear part of the stand 6 is connected with the handrail 7, and the user manipulates the handrail to control the moving direction of the trolley; the end of the handrail close to the user is connected with a display 8 for the user to grasp relevant detection information in real time; 6 is detachably connected to the main box 9, and the main engine is placed inside; four magnetic gradiometer probe rods 1 are arranged in total, and each magnetic gradiometer probe rod 1 is parallel to each other. The waist and base of the above-mentioned isosceles triangle bracket, the non-magnetic profiles of the waist and height, and the height and base are all detachably connected by the oblique connector 11 . A diagonal brace 3 is detachably connected between the front beam 2 and the stand 6 to ensure the strength of the front beam 2 and the firmness of the overall structure. The above-mentioned detachable connections can be connected through profile connectors, which can detachably connect the profiles through various angles, and details will not be repeated here.

Front beam 2, diagonal brace 3, spoke type non-magnetic wheel 4, tripod suspension 5, bench 6, armrest 7, main box 9, wheel hub 10, magnetic gradiometer probe rod support rod 12, wheel beam 13 are all non-magnetic profiles The cross-section of the non-magnetic profile is rectangular, and there are fixing grooves on each side, which facilitates the connection of various angles between the non-magnetic profiles.

The multi-channel fluxgate gradient magnetometer is installed on the magnetic gradiometer probe rod 1 at the front end of the non-magnetic car, away from the host and communication equipment to reduce various magnetic interference from the car body. There are four magnetic gradiometer probe rods 1 with adjustable spacing and perpendicular to the ground at the front end of the non-magnetic trolley. Two fluxgate probes are installed on each magnetic gradiometer probe rod 1, which consists of two fluxgate probes on each rod. For a fluxgate gradient magnetometer, the magnetic data collected by the data acquisition instrument must correspond to the two fluxgate data on each rod, and the four rods will simultaneously collect four sets of fluxgate gradiometer data.

The host is installed in the host box 9 of the non-magnetic trolley, which is easy to operate and ensures safe measurement. The serial port of the host main control board is connected to the fluxgate gradient magnetometer, and the magnetic data is recorded through the data logger; the barometer, altimeter, GPS, and thermometer are connected through the serial port, and the data of each sensor is recorded through the data logger, and the data is transmitted to the host in real time The display screen displays in real time, and the main control board provides time scale signals at the same time, so that the working and recording time of each sensor are consistent.

Components such as the host, data acquisition system and sensors are made of non-ferromagnetic materials, and ferromagnetic materials cannot be used in the installation process to reduce the induced magnetic-like interference generated by the magnetization of the vehicle body by the earth's magnetic field; at the same time, each vehicle A large number of conductive materials such as wires cannot be used between the modules to reduce the eddy current-like magnetic interference generated by cutting the geomagnetic field during the measurement process.

The host mainly realizes two types of functions: 1. Check whether the magnetic measurement system is normal, including power supply check, fluxgate gradient sensor and communication status check, etc. 2. Before the measurement work starts, set the measurement parameters on the host computer, including sampling frequency, magnetic data acquisition range and sampling mode and other parameter settings. 3. During the measurement work, the measurement status is monitored in real time, and the magnetic measurement status acquired by the communication device is transmitted to the host in real time, and the host will display the real-time measurement status. If a certain state of the system is in an abnormal working state, the measurement can be stopped in time , to avoid invalid measurements and wrong measurements.

The invention mainly uses the fluxgate gradient magnetometer as the core magnetic sensor for measuring the geomagnetic field, and integrates the supporting data recorder, communication device, and main control board into the host part of the system, and is equipped with a large-capacity battery module and other sensors. Composition of archaeological magnetic survey system suitable for non-magnetic trolley.

The non-magnetic trolley chooses low-magnetic materials (glass fiber and other composite materials) that are light in weight, high in strength, and have little influence on the magnetic measurement equipment for the production of the trolley. The space of the car body needs to meet the installation requirements of various on-board equipment.

The main engine integrates three main parts: communication device, data recorder and main control board, and is installed in the main box of the non-magnetic trolley body, and is counterweighted with the multi-channel power supply module to ensure the stability of the non-magnetic trolley. The host uses an embedded system, with a 32-bit microprocessor ARM as the core design. Connect and control the work of the fluxgate probes through the I/O interface, obtain the data of each fluxgate probe, and use multi-channel synchronous measurement to realize magnetic gradient measurement and improve data accuracy. Through the expandable interface, the GPS, altitude, temperature, air pressure and other data can be obtained, and all data will be stored synchronously by the data logger.

Among them, the fluxgate probe can realize the measurement of the geomagnetic vector field, and its precision is 1nT. The fluxgate probe is installed on the front vertical rod of the non-magnetic trolley, and two fluxgate probes with different heights are installed on each rod. These two probes form a fluxgate gradiometer. The two fluxgate probes with different heights After the door probe collects the magnetic gradient data, the data collected by the probes at different heights are subtracted to obtain the gradient data. This installation method keeps the magnetic probes away from the body of the non-magnetic trolley, reduces the magnetic interference from the non-magnetic trolley, and improves the quality of magnetic measurement data.

The core of the host computer is a main control computer, which can realize the setting of parameters in the magnetic measurement process, real-time feedback of the working status of the magnetic measurement equipment and power supply during the measurement, and real-time acquisition of measurement data. After the measurement, the measurement data can be simply processed and the quality control of the data can be carried out.

Step 1: Install the host and on-board sensors on the non-magnetic trolley, see Figure 1 for the specific location;

Step 2: Put the low-magnetism trolley equipped with magnetic measuring equipment at the starting point of the area to be tested, turn on the power, start the host control software, and observe whether the power module is working normally;

Step 3: Switch the host control software to the data display interface, observe whether the host and each sensor can communicate normally, and then move the car to observe whether the data change of each sensor is consistent with the actual action of the non-magnetic car;

Step 4: The staff pushes the trolley to keep moving forward at a constant speed until the entire measurement area is measured, and then the power supply can be disconnected;

Step 5: Read the measurement data from the memory card of the host computer and import it into relevant professional software (AeroMag) for processing;

Step 7: In AeroMag, first preprocess the aeromagnetic anomaly data, including normal correction field correction, temperature correction, zero point correction, normal gradient correction, and base point correction;

Step 8: After data preprocessing, process the magnetic anomaly data in AeroMag, including upward continuation, whose main function is to suppress shallow interference and highlight deep trends; vertical derivative, whose main function is to highlight shallow field sources Information; polarized magnetic poles, whose main function is to eliminate the influence of oblique magnetization and simplify the magnetic field form. In addition, the frequency domain can be used to process and convert the magnetic anomaly data accordingly, and finally display the graphics in three dimensions.

As shown in Figure 2, two sets of magnetic gradient data diagrams are shown. The solid line is the magnetic gradient data diagram of one rod, and the dotted line is the magnetic gradient data diagram of the other rod; it can be seen that the two gradient data diagrams are basically the same. The magnetic anomaly at peak A shows that there are cylindrical ferromagnetic materials underground, and the magnetic anomalies at peaks B and C in the figure indicate that there are irregular ferromagnetic materials underground.

Figure 3 is the contour map of the magnetic gradient of the ancient city of Luntai, Xinjiang; it can be seen in the figure that there is a magnetic anomaly in the lower right of the figure, where the magnetic gradient value is relatively high, and the staff excavated here, and a large number of them were found here animal teeth, which shows that the gradiometer has high precision and can guide archaeological work to a certain extent.

Figure 4 is the magnetic gradient value diagram of the straight line in Figure 3. It can be seen from the figure that the magnetic gradient value is -1000--1600nT, and a high gradient value appears at A, which is located in the magnetic anomaly area in Figure 3.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims (7)

1. one kind archaeology magnetic gradient vector detection system, it is characterised in that including main frame, without magnetic dolly and sensing system；It is main Machine includes master control borad, communication device and data acquisition instrument；Sensing system includes being used for without magnetic small truck position, air pressure, temperature Measurement and the sensor of the measurement of magnetic field value；Include GPS and altimeter for the sensor without magnetic dolly position measurement；GPS is obtained The data taken are used for later data magnetic compensation and magnetic anomaly is positioned, and are positioned after finding magnetic anomaly according to the gps data；Highly The data that meter is obtained are mainly used in later data magnetic compensation；Barometer, thermometer measure the gas of no magnetic dolly current location respectively Pressure value and temperature value；It is fluxgate gradient magnetic instrument, multipath magnetic flow door gradient magnetic instrument peace for the sensor that magnetic field value is measured Loaded on without on magnetic dolly magnetic gradiometer feeler lever (1) foremost, away from main frame and communication apparatus to reduce from all kinds of of car body Magnetic disturbance；Without magnetic dolly front end have four spacing adjustable perpendicular to ground magnetic gradiometer feeler lever (1), every magnetic gradiometer feeler lever (1) two fluxgate magnetic cores on two different fluxgate magnetic cores of setting height(from bottom), every bar constitute a fluxgate gradient After magnetometer, two highly different fluxgate magnetic core collection magnetic gradient data, the data of the probe collection of different height are subtracted each other And gradient data is obtained, magnetic data and the two magnetic flux gated datas on every bar of data collecting instrument collection are corresponded, four magnetic Gradient former feeler lever will gather four groups of fluxgate gradient former data simultaneously.

2. archaeology magnetic gradient vector detection system according to claim 1, it is characterised in that described to include magnetic without magnetic dolly Gradient former feeler lever (1), front end cross beam (2), diagonal brace (3), spoke type without magnetic wheel (4), tripod suspension (5), stand (6), help Hand (7)；Spoke type has two altogether without magnetic wheel (4), and the wheel hub (10) with wheel crossbeam (13) two ends is detachably solid by bolt Fixed connection；Tripod suspension (5) is the isosceles triangle support being detachably connected using aluminium alloy extrusions, isosceles triangle Support drift angle is detachably connected on wheel crossbeam (13), and the two ends on the base of isosceles triangle support are detachably connected on stand (6) on, the front portion of stand (6) is detachable to set front end cross beam (2), and the detachable vertical connection magnetic gradiometer of front end cross beam (2) is visited One end of bar support bar (12), the other end connection anchor ear of magnetic gradiometer feeler lever support bar (12), magnetic gradiometer feeler lever (1) passes through Anchor ear is detachably connected on magnetic gradiometer feeler lever support bar (12), and magnetic magnetic gradiometer feeler lever (1) is vertical with ground holding；Stand (6) rear portion connection handrail (7), manipulates handrail by user and controls the dolly moving direction；Connect on handrail close to user one end It is connected to display instrument (8) and grasps relevant detection information in real time for user；Mainframe box (9) is detachably connected on stand (6), inside is put Put main frame；Set between four magnetic gradiometer feeler levers (1), each magnetic gradiometer feeler lever (1) and be parallel to each other altogether.Above-mentioned isoceles triangle The waist of shape support and base, waist are detachably connected with high, high and base without magnetic-type material by oblique angle connector (11)；Front end Diagonal brace (3) is removably connected between crossbeam (2) and stand (6), with the intensity for ensureing front end cross beam (2) and integrally-built jail Gu；Front end cross beam (2), diagonal brace (3), spoke type are without magnetic wheel (4), tripod suspension (5), stand (6), handrail (7), mainframe box (9), wheel hub (10), magnetic gradiometer feeler lever support bar (12), wheel crossbeam (13) are that no magnetic-type material makes, and this is without magnetic-type material There are fixing groove, the convenient connection without various angles between magnetic-type material in rectangular cross-section section, each side.

3. archaeology magnetic gradient vector detection system according to claim 1, it is characterised in that main frame is installed on no magnetic dolly Mainframe box (9) in, the serial ports of main frame master control borad connection fluxgate gradient magnetic instrument passes through data acquisition instrument and records magnetic data； Barometer, altimeter, GPS, thermometer are connected by serial ports, the data of each sensor are recorded by data acquisition instrument, and in real time Transmission data are shown that master control borad provides timing signal simultaneously, makes each working sensor and record to host display in real time Time consistency.

4. archaeology magnetic gradient vector detection system according to claim 1, it is characterised in that main frame, data collecting system It is that nonferromugnetic material makes with the part such as sensor, while it can not use ferrimagnet in installation process, to subtract Small car body is magnetized produced sensing class magnetic disturbance by earth's magnetic field；It can not be led between vehicle-mounted modules using substantial amounts of leads Electric material, to reduce the vortex type magnetic disturbance in measurement process produced by cutting earth's magnetic field.

5. archaeology magnetic gradient vector detection system according to claim 1, it is characterised in that main frame realizes following functions： First, check whether geomagnetic survey system is normal, including electric quantity of power supply inspection, fluxgate gradient sensor and communication state inspection；2nd, exist Before measurement work starts, measurement parameter is configured on main frame, including sample frequency, magnetic data acquisition range and sampling mould The parameter settings such as formula；3rd, during measurement work is carried out, to the real-time monitoring of measuring state, by communication device by the magnetic measurement shape of acquisition State passes to main frame in real time, and main frame is shown real-time status is measured, if some state of system is in non-normal working shape State, can stop measurement in time, it is to avoid invalid measurement and mistake measurement.

6. the side that archaeology magnetic gradient vector is detected is carried out according to any archaeology magnetic gradient vector detection systems of claim 1-5 Method, it is characterised in that comprise the following steps：

The first step：Main frame and onboard sensor are loaded on without on magnetic dolly；

Second step：The low magnetic dolly that will be equipped with magnetic survey equipment is put in the starting point in region to be measured, turns on the power, and starts host computer control Whether software, observation power module is working properly；

3rd step：Host control software is switched to data display interface, whether can be just between observation main frame and each sensor Normal open believes then whether the data variation of each sensor of moving cart observation is consistent with without magnetic dolly actual act；

4th step：Promote dolly to remain a constant speed advance by staff, untill complete measured zone of measurement, can disconnect Power supply；

5th step：Measurement data is read from the storage card of main frame, and imports and is handled in related software AeroMag；

7th step：Aeromagnetic anomaly data are pre-processed first in AeroMag, including normal correction field is corrected and become outer day Correction, temperature correction, zero correction, normal gradient correction, base correction；

8th step：After data prediction, magnetic anomaly regular data is handled in AeroMag, including upward continuation, it is mainly made Disturbed with for compacting shallow-layer, prominent deep trend；Vertical Derivative, its main function is prominent shallow-layer field source information；Change magnetic pole, its Main function simplifies magnetic field configuration to eliminate oblique magnetizing effect.

7. method according to claim 6, it is characterised in that can also be carried out using frequency domain to magnetic anomaly regular data corresponding Processing and conversion, most at last figure carry out Three-dimensional Display.