SY/T 10026-2001 Calibration Guide for Offshore Seismic Acquisition and Positioning Auxiliary Equipment SY/T10026-2001 Standard download decompression password: www.bzxz.net

TCS 75.020
Registration No.: 9607—2001
Petroleum and Natural Gas Industry Standard of the People's Republic of ChinaSY/T10026—2001
Guide for calibrating the positioning assistant equipment of marine seismic acquisition2001-09-24 Issued
State Economic and Trade Commission
2002-01-01 Implementation
SY/T 10026-2001
Reference Standard
Gyro Compass Calibration
5Cable Compass (Square Sensor) Calibration6LXGPS Static Calibration
7Cable Depth Sensor Calibration
8Laser Ranging System Calibration
9RGPS Dynamic Calibration
10Echo Sounder Calibration·
Appendix A (Standard Appendix)
Record Form Format
SY/T 10026--2001
With the continuous development of offshore seismic exploration technology, the types and quantities of positioning and navigation equipment (sensors) have increased dramatically. In order to ensure the accuracy and reliability of each receiving point and source position, it is very important to calibrate the sensor regularly. This standard is formulated to standardize the calibration methods, technical requirements and technical indicators of gyrocompass, cable compass, real-time differential global positioning system (DXGI\S) static, cable depth sensor, laser ranging system, relative global positioning system (RGPS) dynamic, depth sounder, etc. used in geophysical prospecting vessels. Appendix A of this standard is the appendix of the standard.
This standard was proposed by China National Offshore Oil Corporation. The drafting unit of this standard is China National Offshore Oil Geophysical Exploration Company. The main drafters of this standard are Cao Zhanquan
Yang Sigu
The chief examiner of this standard is Xu Guangxiou
1 Scope
Petroleum and Natural Gas Industry Standard of the People's Republic of China
Calibration Guide for ralilyrating the positioning assistantcquipmcnt of marine scismic acquisitionSY/T 10026--2001
This standard specifies the calibration methods, technical requirements and technical indicators of shipboard gyrocompass, cable compass, real-time differential global positioning system (LDGPS) static, cable depth sensor, laser ranging system, relative global positioning system (RGPS) dynamic, depth sounder, etc. This standard is applicable to the calibration of the above equipment used in geophysical prospecting ships. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the All versions are valid. All standards will be revised. Parties using this standard should explore the possibility of using the following standards to promote the latest version. SY/T10015-1998 Technical specification for offshore towed 2D seismic data acquisition SY/T10016-1998 Technical specification for offshore towed 3D seismic data acquisition SY/I1019-1998 Technical specification for offshore real-time differential global positioning system (XGPS) positioning measurement 3 Terminology
The following terms apply to this standard.
3.1 G-0i value
The difference between the measured ship heading and the gyrocompass reading. 3.2 "Same hole" principle
In normal cable towing, it is assumed that each node of the cable must pass through the same point in the water in a forward and backward order, and all cable compass birds have consistent readings when passing through this point.
3.3 Compass bird eye tracking deviation
When the cable feather angle is less than 5\, the compass horse error calculated using the "same hole" principle 3.4 True heading
The true heading calculation formula is:
Heading =HeadinglAMag
Where: Headingl——compass bird heading reading Ag——compass bird deviation positive value;
Mag——regional magnetic declination.
3.5 Public navigation point: a point used to calculate the gun position in the integrated navigation system, which can be on board or outside the ship, and can be a real point or a virtual point:
3.6TXGPS antenna bias: a 1-dimensional distance from the DGPS antenna to the public navigation point. 3.7 Cable depth sensor: a device used to determine the depth of cable sinking 3.8 Laser ranging system: a system composed of several laser mirrors to measure the azimuth and distance of the target. Approved by the State Economic and Trade Commission on September 24, 2001 and implemented on January 1, 2002
SY/T 10026-2001
3,9C2-02 value: refers to the difference between the calculated value and the observed value in the laser ranging system. 3.10 Calibration target: Prism of known fixed reference point. 3.11 Verification target: Prism of laser monitoring point on board ship 3.12 RGPS: refers to the relative global positioning system used on cable tail marker and source tail marker. 3.13 Depth of echo sounder probe: vertical distance from water surface to echo sounder sensor. 4 Gyro compass calibration
4.1 Requirements
Mainly include:
a) Determine the time and place of calibration, and prepare complete calibration and communication equipment; b) During calibration, the hull should be kept stable; c) Draw a calibration baseline suitable for gyro compass correction from a high-precision known point, and the azimuth accuracy of the baseline should be within 0.1: Conventional measurement methods (such as microwave rangefinder) should be used to accurately determine the ship's collapse; d) Measure the calibration angle of the gyro compass gyro head relative to the centerline of the ship. The gyro head cannot move during the calibration process; if If the gyro head moves for any reason, the calibration is invalid and must be recalibrated; e) The calibration result is valid for six months:
f) The difference between the C1-01 values ​​obtained in the two directions of the gyro compass should be less than F0.5° 4.21. Operation process
4.2.1 Start the navigation system, set the compass calibration value in the system to 0, set the latitude compensation of the gyro compass to the latitude of the reference point, and set the speed compensation to 0
4.2.2 When adjusting the measurement clock and navigation system, synchronize them with the CPS clock. 4.2.3 After the gyro compass has been running for at least 24 hours and the hull has been stable at the dock for at least 2 hours, start calibration. 4.2.4 Place the reflective prism used for calibration accurately on the centerline of the ship, and use the distance and azimuth measured by one or two total stations on the dock to determine the ship's direction.
4.2.5 Collect more than 15 sets of reliable measurement values ​​within 90 minutes. 4.2.6 Use the navigation system to record the reading and time of the gyrocompass. 4.2.7 Turn the ship to 180°, and repeat steps 4.2.5 to 4.2.6 after stabilization for 2 hours. 4.2.8 Convert the measured readings into gyrocompass readings, and derive the C,-O, value of the gyrocompass together with the gyrocompass data recorded by the integrated navigation system,
4.2.9 Process the complete recorded results, and provide a timing diagram and statistical analysis to evaluate the stability of the gyrocompass. 4.2.10 Prepare a calibration report. The recorded results of the entire calibration process should be used as the basic part of the calibration report. 4.2.11 Output the gyrocompass correction value produced by the calibration to compensate for the ship's heading determined by the gyrocompass. 4.3 Recording form
Recording form See Table A1 in Appendix A (Appendix of the standard). 5 Cable compass bird (direction sensor) calibration 5.1 Requirements
Mainly include:
a) It should be carried out on the selected site on land. Only when all the deviation values ​​of the compass bird in eight directions (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) are less than ±0.5°, can the compass bird be considered to have passed the calibration; b) All calibration results should be documented in the calibration report; c) The validity period of the result should be 2 years
d) When the compass bird parts are replaced and the tracking deviation between adjacent compass birds is greater than 1', it should be recalibrated. 2
5.2 Site survey and requirements
Mainly include:
SY/T 10026--2001
a) The site should be an open flat land, away from roads, houses, factories, high-voltage lines, etc., and the magnetic field changes should be gentle. b) Necessary measuring equipment should be provided to survey the site. The method is: first determine the center point of the site from the known point, and then determine eight points on a square with each side of 15m with this point as the center to form 0°, 45°, 90°, 135°, 180°, 225°, 270°, and 315° calibration lines.) Necessary equipment should be provided, such as computers, magnetometers, magnetometers, levels, compasses, etc., to conduct magnetic field surveys and determine the magnetic north-south direction. The specific method of magnetic field survey is: 1) Establish a 5m×5m area inside the site, use a magnetometer to measure the magnetic field change from south to north at an interval of 1tm, and the difference between the sampling values ​​of adjacent points should not exceed 10nT: 2) Complete the magnetic field survey within 5min, and the difference between the sampling values ​​of the entire site should not exceed 15nl3) Use a magnetometer and theodolite to determine the magnetic north-south direction of the calibration site, that is, determine the magnetic declination: 5.3 Workflow
5.3.1 Place the compass bird to be calibrated 20m away from the calibration site and arrange them in order. 5.3.2 Place the standard calibration compass at the center of the site and adjust the hydrometer to the end of the calibration. 5.3.3 Place eight "V" shaped calibration platforms on eight base points in sequence, align the center with the reference point, adjust to a horizontal level, and align the direction with the calibration line squares (0°, 45°, 90°, 135°, 180, 225°, 270°, 315\) 5.3.4 Connect the computer, modem and other equipment and start calibration. 5.3.5 Place a compass bird to be calibrated on a 0° "V"-shaped platform, and start reading after confirming that the direction is correct; the compass bird's heading reading plus the magnetic declination is the 0° azimuth of the compass, and then place it on 45°, 90°, 135°, 180°, 225°, 270°, 315° \V"-shaped platforms in turn, obtain the compass bird readings and record them. 5.3.6 During the calibration process, the standard calibration compass is read once every 30 minutes. 5.3.7 Repeat steps 5.3.5 and 5.3.6 for all compass birds in turn until the entire calibration is completed. 5.3.8 All data, including site survey, magnetic field survey and compass calibration, are collected and recorded. Processing to form the final calibration report: 5.4 Record form
The record form is shown in Table A2 in Appendix A (Standard Appendix). 6DGFS static calibration
6.1 Requirements
Mainly include:
a) The time and place of calibration should be determined, and calibration and communication equipment should be prepared; b) During the calibration, the hull should be kept stable; r) Check the validity of the parameters, and the parameters should not change during the calibration process: d) The calibration result should be valid within the coverage area of ​​the XGPS; e) The horizontal error of DGPS should be within 2m, which is considered qualified. 6.2 Operation process
6.2.1 Start running DGPS system, correctly set the parameters of the TGPS system in this area. 6.2.2 Input the navigation main longitude calibration value into the integrated navigation system. 6.2.3 Adjust the measurement clock and the integrated navigation system clock to synchronize with the GPS clock. 6.2.4 Use conventional measurement methods to accurately determine the horizontal position of the IGPS antenna, which should be accurate to the meter level: 6.2.5 Input the DGIS antenna bias into the integrated navigation system and establish a reflecting prism at the common navigation point. 6.2.6 Input the IXPS antenna bias into the integrated navigation system. 6.2.7 Collect more than 15 sets of reliable data from the reflecting prism at the common navigation point, and the time should not be less than 30 minutes: 3
SYT 10026--201
6.2.8 Record DGPS data, public navigation point data, main compass direction and time in real time. 6.2.9 Calculate the position of the public navigation point based on the measured distance and azimuth. 6.2.10 Use the measurement results and the records of the integrated navigation system to calculate the horizontal error of the LGPS system. 6.2.11 Perform statistical analysis on the DGPS data collected during the calibration period. The data should be made into a distribution map to confirm the stability of IXGPS. 6.2.12 Write a calibration report. The recorded results of the entire calibration process should be used as the basic part of the calibration report. 6.3 Recording form
See Table A37 Cable Depth in Appendix A (Appendix of Standard Male) for the recording form. Depth sensor calibration
7.1 Requirements
Should include:
a) During the use of pressure equipment, it should be ensured that no harmful incidents occur;
The pressure gauge used for calibration should have a qualified inspection certificate within one year, and the error should be within the range of 1kPa; for the pressure gauge with Psi as the unit, the error should be within the range of 0.Lpsi;
) The calibration should be completed on board and formally documented;
d) During the calibration process, the seawater density and depth correction values ​​cannot be changed;
e) The calibration result should be valid for six months;
f) The depth sensor parts should be recalibrated when replaced;
g) The difference between the actual reading and the set reading should be less than or equal to ±0.3m, and the calibration is considered qualified. 7.2 Workflow
7.2.1 Form a pressure-depth relationship table and relationship curve,
7.2.2 Start the air compressor to provide sufficient pressure required for calibration. 7.2.3 Set the depth sensor correction value in the depth sensor display and recording device to 0. 7.2.4 Record the depth sensor reading without pressurization [with a force of 1 standard atmosphere (1ati=101.325kPa)]. 7.2.5 Slowly adjust the pressure gauge to 50kPa, observe the change in depth, and record the reading after it stabilizes. 7.2.6 Pressurize in intervals of 50kPa to obtain data until the pressure exceeds the cable sinking depth required by the user by more than 50kPa. 7.2.7 Slowly adjust the pressure gauge to k1a, observe the change in data, and record the reading after it stabilizes. 7.2.8 Repeat steps 7.2.4 to 7.2.7 to calibrate all depth sensors in turn. 7.2.9 The cable depth sensor correction value generated by the calibration is used to compensate for the depth sensor measurement value. 7.3 Record form
The record form is shown in Table A4 in Appendix A (Appendix of the standard). 8 Laser ranging system calibration
8.1 Requirements
Mainly include:
a) The time and place of calibration should be determined, and complete calibration and communication equipment should be available; b) During the calibration, the hull should be kept stable; c) A reference point (with an accuracy of meters) and a calibration baseline (with an azimuth accuracy of less than U.1°) suitable for laser ranging system calibration should be provided;
d) The calibration target should be on the center line of the ship and be the rear-sight target relative to the laser scanning head: the distance between the calibration mark and the laser scanning head should be greater than 100m;
e) If the calibration mark and the calibration date mark are moved for any reason, the calibration will be invalid; f) The calibration result should be valid for six months: 4
SY/T 10026-+2001
g) The C,-0, value of the azimuth calibration should be less than ±0.25°, and the C,0 value of the distance calibration should be less than +0.5m. The calibration is qualified.
8,2 Workflow
8,2.1 Ensure that the laser ranging system is configured correctly and determine the relative position of the laser head and the calibration target: 8.2.2 The azimuth and distance calibration values ​​of the laser ranging system are set to 0. 8.2.3 Adjust the measurement clock and navigation system clock to synchronize with the GPS clock. 8.2.4 Record all data of the laser ranging system during the calibration process in real time. 8.2,5 Measure at least 15 groups of valid digital fingers and record the time and the original data of the gyrocompass. 8.2.6 Calculate the distance and azimuth from the laser ranging system to the calibration target. 8.2.71
Use the measured results and the raw data from the laser ranging system and the gyro compass data to determine the calibrated azimuth and distance errors
8.2.8 Perform statistical analysis on the laser data collected during calibration and make a discrete distribution diagram to confirm the stability of the system. 8,2.9 The laser correction value generated by the calibration is used for compensation of the laser system. 8.3 Record table
The record table is shown in Table A5 in Appendix A (Standard Appendix). 9 RGPS dynamic calibration
This chapter describes the method and technical requirements for dynamic calibration of RGPS using the laser ranging system. 9.1 Requirements
Mainly include:
a) Calm sea conditions with wave height less than 1.5m should be selected; b) The gyro compass of the laser ranging system should be calibrated and qualified; c) During the calibration process, all parameters shall not change; d) During the calibration process, the ship shall maintain a constant direction of sailing against the current; e) The ranging error between RGPS and the laser system shall be less than or equal to ±2m; f) The calibration result shall be valid for six months. 9.2 Workflow
9.2.1 Obtain the three-dimensional relationship data between the laser system scanning head and the RGIS earth antenna and the elevation of the laser system scanning head. 9.2.2 Start the laser system, RGI\S system and integrated navigation system, and set the correction values ​​in each system to 0. 9.2.3 Check the RGPS output type,
9.2.4 Place the laser marker and RGI'S target at the same point on the stern marker and calculate their elevations. 9.2.5 When the stern marker is 1000-1500m away from the ship, the navigation system simultaneously records the laser ranging system, gyro compass and RGPS data for a time greater than 15min
9.2.6 Perform statistical analysis on the collected RGPS data to determine the stability of the system and the correction values ​​of the laser ranging system and gyro compass
9.2.7 Use the recorded data to calculate the measurement error of RGPS. 9.2.8 Repeat steps 9.2.4 to 9.2.7 to calibrate all R(PS targets: Write a calibration report, and all original recorded data should be the basis of the report. 9.2.9
9.3 Record form
For the record form, see Table A610 in Appendix A (Standard Appendix).
This chapter describes the plumb line calibration method.
10.1 Requirements
Mainly include:
SY/T 0026—200
a) The time and place of calibration should be determined, and complete calibration and communication equipment should be available; b) The advection time should be selected for the calibration of the depth sounder, and the hull should be kept stable during the calibration period; c) The depth of the probe should be calculated;
d) The calibration result should be valid for six months; e) If the sensor is replaced, it should be recalibrated; f) The difference between the actual water depth and the measured water depth should be less than or equal to 0.3tna10,2 Workflow
10.2.1 Start the depth sounder, check the configuration of the depth sounder parameters, and set the depth compensation to 0.10.2.2 Select the correct acoustic velocity (this velocity can be obtained using a speed meter).10.2,3 Use a plumb line to detect the water depth near the two sensors of the ship, and record the reading and time.10.2.4 Use a plumb line to detect the water depth at the bow and stern, and record the reading and time.10.2.5 Repeat steps 10.2.3 and 10.2.410.2.6 The flat flash value of the eight readings is the actual water depth at that location.10.2.7 During calibration, use the navigation computer to record the data of the depth sounder:10.2.8 Perform statistical analysis on the data of the depth sounder during calibration to determine the validity of the readings.10.2.9 The average value of the depth measured by the depth sounder plus the probe depth is used as the measured water depth at that location. 10.2.10 The difference between the actual water depth and the measured water depth is the calibration value of the depth sounder. The depth of the depth sounder probe plus the calibration value is the compensation value of the depth sounder.
10.3 Recording table
Recording table table A76 in Appendix A (Standard Appendix)
Recording table format See Table AI-Table A7..
Compass 1 model
Compass 2 model
Location:
Gyro compass longitude and latitude compensation setting
Gyro compass speed compensation setting
Navigation system Gyro compass calibration value reset to 0
Time
Surveying team
Navigation group
Processing group
Support personnel
SY/T 100262001
Appendix A
(Appendix to the standard)
Record form format
Table A1 Gyrocompass calibration record table
Compass 1 serial number
Compass 2 serial number
Compass 1 reading
Compass 2 reading
Regional magnetic declination
Site survey personnel
Site investigation personnel
Calibration personnel:
Site magnetic field survey and magnetic north and south determination
V-shaped frame push
Compass bird number
Marking difficult bearing
SY/T 10026—2001
Table A2 Cable compass bird calibration table
Compass bearing
IXGPS System type 1
DGPSSystem type 2
System|Antenna bias
System 2 Antenna bias
Location:
Main compass calibration
DGPS system bias input to navigation system
Survey team
Navigation group
Support staff
SY/T 10026—2001
Table A3LDGPS static calibration table
Serial number
Serial number
System 1
System 2
Compass 1 model
Compass 2 model
Location:
Gyro compass longitude and latitude compensation setting
Gyro compass speed compensation setting
Navigation system Gyro compass calibration value returns to 0
Time step
Measurement team
Navigation group
Processing group
Support staff
SY/T 100262001
Appendix A
(Appendix to the standard)
Record form formatbzxz.net
Table A1 Gyrocompass calibration record table
Compass 1 serial number
Compass 2 serial number
Compass 1 reading
Compass 2 reading
Regional magnetic declination
Site survey personnel
Site investigation personnel
Calibration personnel:
Site magnetic field survey and magnetic north and south determination
V-shaped frame push
Compass bird number
Marking difficult bearing
SY/T 10026—2001
Table A2 Cable compass bird calibration table
Compass bearing
IXGPS System type 1
DGPSSystem type 2
System|Antenna bias
System 2 Antenna bias
Location:
Main compass calibration
DGPS system bias input to navigation system
Survey team
Navigation group
Support staff
SY/T 10026—2001
Table A3LDGPS static calibration table
Serial number
Serial number
System 1
System 2
Compass 1 model
Compass 2 model
Location:
Gyro compass longitude and latitude compensation setting
Gyro compass speed compensation setting
Navigation system Gyro compass calibration value returns to 0
Time step
Measurement team
Navigation group
Processing group
Support staff
SY/T 100262001
Appendix A
(Appendix to the standard)
Record form format
Table A1 Gyrocompass calibration record table
Compass 1 serial number
Compass 2 serial number
Compass 1 reading
Compass 2 reading
Regional magnetic declination
Site survey personnel
Site investigation personnel
Calibration personnel:
Site magnetic field survey and magnetic north and south determination
V-shaped frame push
Compass bird number
Marking difficult bearing
SY/T 10026—2001
Table A2 Cable compass bird calibration table
Compass bearing
IXGPS System type 1
DGPSSystem type 2
System|Antenna bias
System 2 Antenna bias
Location:
Main compass calibration
DGPS system bias input to navigation system
Survey team
Navigation group
Support staff
SY/T 10026—2001
Table A3LDGPS static calibration table
Serial number
Serial number
System 1
System 2
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