CN111856554A - Air gun wavelet measuring device and method under shallow water condition - Google Patents
Air gun wavelet measuring device and method under shallow water condition Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/186—Hydrophones
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/38—Seismology; Seismic or acoustic prospecting or detecting specially adapted for water-covered areas
- G01V1/3808—Seismic data acquisition, e.g. survey design
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Abstract
The invention relates to a device and a method for measuring airgun wavelets under shallow water conditions, which comprises a submarine cable, a data processing unit, a vertical cable and a floating body unit which are connected in sequence; the submarine cable comprises a plurality of submarine cables which are vertical to each other, a plurality of first detector combinations are arranged on each submarine cable at the same interval, and each first detector combination comprises a magnetoelectric detector and a piezoelectric detector and is used for detecting air gun wavelet signals in a plane; the vertical cable is vertical to the plane of the submarine cable, and a plurality of hydrophone combinations are uniformly arranged on the vertical cable and used for detecting air gun wavelet signals in the vertical direction; the data processing unit acquires air gun wavelet signals acquired by the submarine cable and the vertical cable and analyzes and processes the air gun wavelet signals; the float unit is used for floating the measuring device on the water surface, thereby determining the position of the measuring device. The method is more suitable for far-field wavelet acquisition under the shallow water condition, can realize three-dimensional observation, and obviously improves the measurement precision.
Description
Technical Field
The invention relates to a device and a method for measuring air gun wavelets under shallow water conditions, and belongs to the technical field of seismic exploration.
Background
The far-field wavelet of the air gun seismic source is an important index for measuring the performance of the seismic source and is also important input data in seismic data processing. The far-field wavelet of the air gun source can relatively simply obtain the signal characteristics of the seismic air gun source, is easy to visualize and understand and is an important standard for measuring the performance of the source. Under shallow water conditions, the precision of the measured air gun wavelet is seriously influenced by complex multiple waves, guided waves, tides, surge and other special interference waves and water body structures, but the precision of the obtained data is lower because the measurement device which is commonly used at present under the shallow water conditions is a high-resolution multi-channel horizontal cable, and the resolution ratio of the measurement device is only capable of meeting the requirements of seismic exploration of middle-deep or shallow engineering and cannot meet the requirements of high-precision seismic exploration due to the fact that the measurement device is close to the sea level. The other method is a method for extracting from a shallow earthquake or a shallow stratum section, and the method has the defects of weak energy, poor anti-interference capability and the like, and cannot obtain accurate far-field wavelets of an air gun seismic source. In summary, it is difficult to obtain airgun wavelets through actual measurements in shallow water conditions.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a device and a method for measuring airgun wavelets in shallow water, which are more suitable for far-field wavelet acquisition in shallow water, and can realize stereo observation with significantly improved measurement accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme: a measuring device for airgun wavelets under shallow water conditions comprises a submarine cable, a vertical cable, a data processing unit and a floating body unit which are sequentially connected; the submarine cable comprises a plurality of submarine cables which are vertical to each other, a plurality of first detector combinations are arranged in each submarine cable at the same interval, and each first detector combination is a combination of a magnetoelectric detector and a piezoelectric detector and is used for detecting air gun wavelet signals in a plane; the vertical cable is vertical to the plane of the submarine cable, and a plurality of hydrophone combinations are uniformly arranged on the vertical cable and used for detecting air gun wavelet signals in the vertical direction; the data processing unit acquires air gun wavelet signals acquired by the submarine cable and the vertical cable and analyzes and processes the air gun wavelet signals; the float unit is used for floating the measuring device on the water surface, thereby determining the position of the measuring device.
Further, the vertical cable comprises a working section and a connecting section, the working section comprises the vertical cable and a plurality of hydrophone combinations which are distributed on the vertical cable at equal intervals, and the connecting section is sleeved outside each hydrophone combination.
Further, the second type of detector assembly is a hydrophone assembly, comprising at least two spaced apart piezoelectric detectors.
Further, the connecting section is a high-strength titanium alloy protective sleeve.
Further, an attitude sensor is arranged in the floating body unit, and the attitude sensor is connected with the data processing unit and used for controlling the inclination angle of the measuring device relative to the vertical direction
Furthermore, the data processing unit comprises a seismic data acquisition module, a temperature sensor, a pressure sensor, a GPS positioning system and a power module, the seismic data acquisition module acquires data acquired by the temperature sensor, the pressure sensor and the GPS positioning system, and the power module supplies power to the data processing unit.
Further, the seismic data acquisition module comprises a master control board, a first seismic data acquisition board, a second seismic data acquisition board, a third seismic data acquisition board, a temperature and pressure acquisition board, an inclination data acquisition board, a GPS and power control board; the system comprises a first seismic data acquisition board, a second seismic data acquisition board, a third seismic data acquisition board, a temperature pressure acquisition board, a power supply control board, a GPS (global positioning system) and a power supply module, wherein the first seismic data acquisition board, the second seismic data acquisition board and the third seismic data acquisition board are respectively used for acquiring wavelet signals of a vertical cable, a first submarine cable and a second submarine cable, the temperature pressure acquisition board is connected with the temperature sensor and the pressure sensor to realize acquisition and control of temperature and pressure, the inclination angle data acquisition board is connected with an attitude sensor to realize acquisition and control of an inclination angle of the device, the GPS is connected with the power supply control board, the GPS positioning system and the power supply module are used for positioning and supplying power to the device.
Further, a metal base is arranged at the bottom of the data processing unit; the side walls of the data processing unit are respectively provided with a watertight connector of the data processing unit for connecting with the watertight connectors of the vertical cable and the submarine cable.
Further, polyurethane solid materials are filled between the submarine cables and the first type of detector combination, and polyurethane solid materials are filled between the vertical cables and the second type of detector combination; the submarine cable and the vertical cable are both wrapped by polyamide materials, and Kevlar fibers are mixed in the polyamide materials.
The invention also discloses a method for measuring the air gun wavelet under the shallow water condition, which adopts any one of the air gun wavelet measuring devices under the shallow water condition and comprises the following steps: s1, testing the submarine cable and the vertical cable, and assembling the measuring device; s2, after reaching a to-be-detected place, firstly putting the vertical cable and the floating body unit into water, then sinking the data processing unit into the sea, dragging one submarine cable to a specified position by using a boat, pulling the rope to slowly place the submarine cable to the sea, and then putting the other submarine cable to the specified position in the same way; s3, determining and recording the position offset of the measuring device according to the changes of the tidal flow direction and the water depth in the area to be measured; and after the S4 device is placed, the device activates a gas gun seismic source, digital-to-analog conversion is carried out on the acquired and received analog signals through the data processing unit, and the converted digital signals are fed back to the upper computer for storage and recording.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. a stereo observation mode is adopted, so that the measurement precision of the air gun wavelet under the shallow water condition is improved; 2. the change rule of the air gun wavelet can be monitored in the transverse direction and the longitudinal direction by adopting a combined measuring mode of a submarine cable and a vertical cable, so that richer and more complete air gun wavelet data can be obtained; 3. noise interference is relatively less, and the vertical cable and the submarine cable are far away from the sea surface, so that the influence of wave and surge noise is reduced; 4. the attitude sensor is arranged, so that the influence of the attitude of the measuring device on the wavelet can be corrected, and the measuring error is reduced; 5. the temperature and pressure sensors are arranged, so that temperature and pressure information during wavelet measurement can be acquired; 6. when analog signals are converted into digital signals, the time sampling rate is high and can reach 1/32ms, and the selectable sampling rate is more: 1/32ms, 1/16ms, 1/8m, 1/4ms, and 1/2 ms; the pre-amplification gain can be selectively controlled, and 12dB, 24dB, 36dB and 48dB can be selected.
Drawings
FIG. 1 is a schematic structural diagram of an air gun wavelet measuring device under shallow water conditions according to the present invention;
FIG. 2 is a schematic diagram of the structure of a hydrophone module in a vertical cable according to the invention;
FIG. 3 is a schematic diagram of the structure of a data processing unit of the present invention;
FIG. 4 is a top view of the data processing unit of the present invention;
fig. 5 is a schematic structural view of the floating body unit of the present invention.
Reference numerals:
1-a submarine cable; 11-a first detector combination; 12-a first submarine cable; 13-a second submarine cable; 2-vertical cables; 21-a hydrophone combination; 22-a connecting segment; 23-a hydrophone; 3-a data processing unit; 31-a seismic data acquisition module; 311-total control board; 312-a first seismic data acquisition panel; 313-a second seismic data acquisition board; 314-a third seismic data acquisition panel; 315-temperature pressure acquisition plate; 316-GPS and power control board; 32-a temperature sensor; 33-a pressure sensor; 34-a GPS positioning system; 35-a power supply module; 36-a metal base; 4-a floating body unit; 41-attitude sensor; 5-watertight joint.
Detailed Description
The present invention is described in detail by way of specific embodiments in order to better understand the technical direction of the present invention for those skilled in the art. It should be understood, however, that the detailed description is provided for a better understanding of the invention only and that they should not be taken as limiting the invention. In describing the present invention, it is to be understood that the terminology used is for the purpose of description only and is not intended to be indicative or implied of relative importance.
Example one
The embodiment relates to an air gun sub-wave measuring device under shallow water conditions, which comprises a submarine cable 1, a vertical cable 2, a data processing unit 3 and a floating body unit 4 which are sequentially connected as shown in figure 1; the submarine cable 1 comprises a plurality of submarine cables 1 which are vertical to each other, a plurality of first detector combinations 11 are arranged on each submarine cable 1 at equal intervals, each first detector combination 11 is a double-detection detector comprising a magnetoelectric detector and a piezoelectric detector and is used for detecting airgun wavelet signals in a plane, in the embodiment, the number of the first detector combinations 11 is preferably 12, the distance between the two first detector combinations 11 is one meter, and the detection precision can be effectively improved due to the fact that the distance between the detectors is short; the vertical cable 2 is vertical to the plane of the submarine cable 1, and a plurality of hydrophone combinations 21 are uniformly arranged on the vertical cable 2 and used for detecting air gun wavelet signals in the vertical direction; the data processing unit 3 acquires air gun wavelet signals acquired by the submarine cable 1 and the vertical cable 2, and analyzes and processes the air gun wavelet signals; the float unit 4 is used to float the measuring device on the water surface, so that the measuring device position is determined. Polyurethane solid materials are filled between the submarine cable 1 and the first type of geophone combination 11, and polyurethane solid materials are filled between the vertical cable 2 and the hydrophone combination 21; the outsides of the submarine cable 1 and the vertical cable 2 are both wrapped by polyamide materials, and Kevlar fibers are mixed in the polyamide materials. In the embodiment, the submarine cable 1 is arranged in a deeper water area, so that the influence of sea waves, tides and the like on the detection result is avoided, and the submarine cable is more suitable for collecting far-field wavelets under shallow water conditions; by arranging the vertical cable 2 and the at least two mutually perpendicular submarine cables 1, three-dimensional observation in a three-dimensional space can be realized, and the measurement precision is remarkably improved.
The vertical cable 2, as shown in fig. 2, includes an operating section and a connecting section 22, the operating section includes the vertical cable and a plurality of second type of hydrophone combinations, i.e. hydrophone combinations 21, which are distributed equidistantly on the vertical cable, wherein the number of the hydrophone combinations 21 is 12, the distance between each hydrophone combination 21 is one meter, the hydrophone combination 21 includes at least two hydrophones 23 therein, the distance between two hydrophones 23 is preferably 0.2 meter, unlike the first type of hydrophone combination 11, the hydrophone 23 includes only one hydrophone, and the connecting section 22 is sleeved outside each piezoelectric type of hydrophone combination 21. The connecting section 22 is a high strength titanium alloy protective sleeve. The end of the connecting section 22 is connected to the data processing unit 3 by a watertight joint 5 of a 19-pin vertical cable 2.
The data processing unit 3, as shown in fig. 3 and 4, includes a seismic data acquisition module 31, a temperature sensor 32, a pressure sensor 33, a GPS positioning system 34, and a power supply module 35. The seismic data acquisition module 31 comprises a master control board 311, a first seismic data acquisition board 312, a second seismic data acquisition board 313, a third seismic data acquisition board 314, a temperature and pressure acquisition board 315, an inclination data acquisition board and a GPS and power control board 316; the first seismic data acquisition board 312, the second seismic data acquisition board 313 and the third seismic data acquisition board 314 are respectively used for acquiring wavelet signals of the vertical cable 2, the first submarine cable 12 and the second submarine cable 13, the temperature and pressure acquisition board 315 is connected with the temperature sensor 32 and the pressure sensor 33 to acquire and control temperature and pressure, and the GPS and power supply control board 316 is connected with the GPS positioning system 34 and the power supply module 35 to position and supply power to the device. The bottom of the data processing unit 3 is provided with a metal base 36 to keep the data processing unit 3 in a stable attitude on the seabed; the side walls of the data processing unit 3 are provided with watertight joints 5 of the data processing unit 3 for watertight take-over connection with the vertical cable 2 and the submarine cable 1, respectively.
The data processing unit 3 adopts a continuous acquisition mode, can continuously work for 15 days when the maximum sampling frequency is sampled, an embedded controller-ARM-AT 91RM9200 is adopted in the design of the seismic data acquisition module 31 as a main controller, and comprises functions of a memory, a network, a FLASH and the like, the measurement process of the whole measurement device is monitored through each interface, and the device has the functions of acquiring, processing and storing seismic data, monitoring the arrangement state of other external measurement devices and the working state of each internal component and the like, and has the characteristics of small volume, low power consumption, high working reliability, powerful function and the like compared with a common microcomputer.
The first seismic data acquisition board 312 is connected with the vertical cable 2 and is used for acquiring analog signals output by the hydrophones 23 in the 12 hydrophone combinations 21 in the vertical cable 2; the second seismic acquisition board and the third seismic acquisition board are respectively connected with two submarine cables 1 which are vertical to each other, namely a first submarine cable 12 and a second submarine cable 13, and are respectively used for acquiring analog signals output by 12 first detector combinations 11 in the first submarine cable 12 and the second submarine cable 13. A24-bit analog-to-digital converter is formed by CS5372/5376 components, analog signals obtained by the first detector combination 11 and the hydrophone 23 are converted into digital signals, the dynamic range is large (the highest dynamic range can reach 120dB), and the detection capability is strong and suitable for collecting seismic data. Each seismic data acquisition board comprises a preamplifier and a digital and clock device, wherein the preamplifier and an analog-to-digital converter are provided with four signal channels comprising four programmable gain preamplifiers and a delta-sigma A/D digital modulator. The front zoom gain is one of 12dB, 24dB, 36dB and 48dB, and the corresponding sampling rate may be one of 1/32, 1/16, 1/8, 1/4 and 1/2 ms. The digital and clock device consists of FIFO buffer and logic circuit, and is used to provide first-in first-out buffer for A/D converted data, and then record the data into the electronic flash U disk. The record output format is SEG-Y format, the data transmission adopts UDP, TC/PIP, and the transmission rate is 100 Mb/s. The digital and clock unit also includes a high precision GPS7 time service clock generator for providing standard clock for the overall unit control and the delta-sigma A/D converter. The high-precision internal signal source generates sine waves and square waves with various frequency amplitudes and distortion indexes reaching the order of five millionths. The power supply adopts a high-efficiency LM1755 chip to generate +3.3V and +/-2.5V analog power supplies. Thus converting continuous analog signals into discrete digital signals and realizing the digital conversion of the signals collected by the vertical cable 2 and the submarine cable 1.
The first, second and third seismic data acquisition boards are powered by an externally input 4V DC power supply. Due to the fact thatThe needs of accurate sampling still need do secondary treatment to the power on gathering the board, become eight kinds of analog power and two kinds of digital power by the 4V direct current power supply of external input, eight kinds of analog power include: +2.5AV, -2.5AV, +3.3AV, + VRefA,-VRefA,+VRefB,-VRefB and + TSGV, two digital power supplies including: +3.3DV1，+3.3DV2. The ripple coefficient of the power supply voltage of the first, second and third seismic acquisition boards is very high, so that the ripple coefficient of the power supply voltage of 4V needs to be controlled to be 10-15mV, and the ripple coefficient of the analog power supply after digital-to-analog conversion needs to be controlled to be 0.05 mV.
The temperature and pressure data acquisition board is used for acquiring temperature and pressure data in the temperature sensor 32 and the pressure sensor 33 respectively, and transmitting the temperature and pressure data to the master control board 311, and the master control board 311 stores and processes the temperature and pressure data.
The inclination data collecting board is connected to the attitude sensor 41, and is configured to collect inclination data of the attitude sensor 41 in the floating body unit 4, and transmit the collected inclination data to the main control board 311, and the main control board 311 stores and processes the inclination data.
The power module 35 is located at the bottom of the data processing unit 3 and is used for supplying power to the whole measuring device, and the power module 35 comprises a power conversion circuit unit which converts the battery voltage into various power supplies required by the acquisition system, including a digital system power supply, an analog system power supply, an A/D converter high-precision reference voltage and the like. The power module 35 is charged through the watertight connector 5 at the top of the data processing unit 3, and the inside of the whole sphere is sealed by polyvinyl chloride casting.
The data processing unit 3 further comprises a communicator for uploading data acquired by the data processing unit 3 to an upper computer and feeding back control signals of the upper computer to each component of the measuring device, so that the measuring condition and process of the measuring device can be regulated and controlled at any time, and the occurrence of an emergency is avoided.
As shown in fig. 5, a posture sensor 41 is arranged in the floating body unit 4, the posture sensor 41 is connected with the data processing unit 3 and used for controlling the inclination angle of the measuring device relative to the vertical direction, and the posture sensor 41 is connected with an inclination angle data acquisition board in the data processing unit 3. The floating body unit 4 may be any component that can float on the water surface, such as a floating ball.
Example two
Based on the same inventive concept, the embodiment discloses a method for measuring air gun wavelet under shallow water, which adopts the device for measuring air gun wavelet under shallow water, and comprises the following steps:
s1, testing the submarine cable 1 and the vertical cable 2, and assembling the measuring device;
before construction, the submarine cable 1 and the vertical cable 2 are tested, the data processing unit 3 is connected and sealed with the watertight joints 5 of the submarine cable 1 and the vertical cable 2, interfaces of all parts are carefully checked to ensure that no looseness exists, voltage and electric quantity of a battery are tested, and after the data processing unit 3, the submarine cable 1 and the vertical cable 2 are installed, a floating ball is tied to one end, which is not connected with the data processing unit 3, of the vertical cable 2.
S2, the digital bag connected with the vertical cable 2 and the submarine cable 1 is placed on a small ship, the ship is positioned by a GPS, after the ship arrives at a to-be-detected place, the vertical cable 2 and the floating body unit 4 are firstly placed in water, then the data processing unit 3 is placed in the water, the two submarine cables 1 are pulled, and the data processing unit 3 is slowly lowered until the data processing unit 3 sinks to the seabed; the number of the submarine cables 1 is two, each submarine cable 1 is connected with a Kevlar rope, one submarine cable 1 is dragged to a designated position by a boat, the submarine cable 1 is slowly placed on the seabed by pulling the ropes, and the other submarine cable 1 is placed at the designated position in the same way. And the collision between the cable and the detector and the ship body is avoided in the cable laying process.
S3, determining and recording the position offset of the measuring device according to the changes of the tidal flow direction and the water depth in the area to be measured, and determining the offset according to the field experiment result during construction when the sea surface condition is very complex;
and after the S4 device is placed, the device activates a gas gun seismic source, digital-to-analog conversion is carried out on the acquired and received analog signals through the data processing unit 3, and the converted digital signals are fed back to the upper computer for storage and recording. And after the measurement is finished, the cable is recovered, the collected cable, the data processing unit 3, the first detector combination 11 and the hydrophone 23 are checked, and when a problem is found, the cable is required to be repaired or replaced in time.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims. The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The air gun wavelet measuring device under the shallow water condition is characterized by comprising a submarine cable, a vertical cable, a data processing unit and a floating body unit which are sequentially connected;
the submarine cables comprise a plurality of submarine cables which are vertical to each other, a plurality of first detector combinations are arranged on each submarine cable at equal intervals, and each first detector combination comprises a magnetoelectric detector and a piezoelectric detector and is used for detecting air gun wavelet signals in a plane;
the vertical cable is vertical to the plane of the submarine cable, and a plurality of hydrophone combinations are uniformly arranged on the vertical cable and used for detecting air gun wavelet signals in the vertical direction;
the data processing unit acquires air gun wavelet signals acquired by the submarine cable and the vertical cable and analyzes and processes the air gun wavelet signals;
the floating body unit is arranged on the top of the vertical cable and used for floating the vertical cable on the water surface to determine the position of the vertical cable.
2. The air gun wavelet measuring device under shallow water conditions as claimed in claim 1, wherein said vertical cable comprises an operating section and a connecting section, said operating section comprises a vertical cable and a plurality of hydrophone assemblies disposed on said vertical cable and distributed at equal intervals, and said connecting section is sleeved outside each of said hydrophone assemblies.
3. The apparatus of claim 2, wherein the hydrophone assembly comprises at least two of the hydrophones, the hydrophones being piezoelectric geophones.
4. The air gun wavelet measuring device under shallow water conditions of claim 2 wherein said connecting segment is a high strength titanium alloy protective sleeve.
5. The airgun wavelet measuring device under shallow water conditions of claim 1 wherein an attitude sensor is provided in said float unit, said attitude sensor being connected to said data processing unit for controlling the inclination of the measuring device with respect to the vertical.
6. The air gun wavelet measuring device under shallow water conditions as claimed in claim 5, wherein said data processing unit comprises a seismic data acquisition module, a temperature sensor, a pressure sensor, a GPS positioning system and a power supply module, said seismic data acquisition module acquires data acquired by said temperature sensor, said pressure sensor and said GPS positioning system, said power supply module supplies power to said data processing unit.
7. The air gun wavelet measuring device under shallow water conditions as claimed in claim 6, wherein said seismic data acquisition module comprises a master control board, a first seismic data acquisition board, a second seismic data acquisition board, a third seismic data acquisition board, a temperature pressure acquisition board, an inclination data acquisition board and a GPS and power control board; the system comprises a first seismic data acquisition board, a second seismic data acquisition board, a third seismic data acquisition board, a temperature pressure acquisition board, a GPS and a power supply control board, wherein the first seismic data acquisition board, the second seismic data acquisition board and the third seismic data acquisition board are respectively used for acquiring wavelet signals of a vertical cable, a first submarine cable and a second submarine cable, the temperature pressure acquisition board is connected with the temperature sensor and the pressure sensor to realize acquisition and control of temperature and pressure, the inclination angle data acquisition board is connected with an attitude sensor to realize acquisition and control of an inclination angle of the device, the GPS is connected with the power supply control board, a GPS positioning system and the power supply module are used for positioning and supplying power to the device, and the master control board is connected with each acquisition board and the.
8. The air gun wavelet measuring device under shallow water conditions as claimed in claim 6, wherein a metal base is provided at the bottom of said data processing unit; the side walls of the data processing unit are respectively provided with a watertight connector of the data processing unit, which is used for watertight connection with the vertical cable and the submarine cable.
9. The shallow water air gun wavelet measuring device according to any one of claims 1-8, wherein a polyurethane solid material is filled between said submarine cable and said first geophone combination, and a polyurethane solid material is filled between said vertical cable and said hydrophone combination; the submarine cable and the vertical cable are both wrapped by polyamide materials, and Kevlar fibers are mixed in the polyamide materials.
10. A method for measuring airgun wavelet under shallow water condition, which comprises the following steps:
s1, testing the submarine cable and the vertical cable, and assembling the measuring device;
s2, after reaching a to-be-detected place, firstly putting the vertical cable and the floating body unit into water, then sinking the data processing unit into the sea, dragging one submarine cable to a specified position by using a boat, pulling the rope to slowly place the submarine cable to the sea, and then putting the other submarine cable to the specified position in the same way;
s3, determining and recording the position offset of the measuring device according to the changes of the tidal flow direction and the water depth in the area to be measured;
and after the S4 device is placed, the device activates a gas gun seismic source, digital-to-analog conversion is carried out on the acquired and received analog signals through the data processing unit, and the converted digital signals are fed back to the upper computer for storage and recording.
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