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Sejong
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Sejong Contact:
| Agency | Korea Astronomy and Space Science Institute |
| Mailing Address | 776 Daedeok-Daero Yuseong-gu Daejeon 305-348 Republic of Korea |
| Primary Contact | |
| Contact Name | Man-Soo Choi |
| Telephone (primary) | +82-42-865-3244 |
| Telephone (secondary) | |
| Fax | +82-42-861-5610 |
| cmsoo@kasi.re.kr | |
| Secondary Contact | |
| Contact Name | |
| Telephone (primary) | |
| Telephone (secondary) | |
| Fax | |
Sejong Coordinates:
Approximate Position:
| X coordinate | [m] | -3110108.3836 |
| Y coordinate | [m] | 4082170.2894 |
| Z coordinate | [m] | 3774911.7489 |
| Latitude | [deg] | 36.520991 N |
| Longitude | [deg] | 127.302913 E |
| Elevation | [m] | 176.415 |
| Survey Method | ||
| Date Measured | ||
| Additional Information | ||
Sejong News:
Local Events:
No local events found.
SLRMail Messages:
No SLRMail mesages found.Sejong Link:
Sejong: Site Log
Instructions and Update Site Log
You can use the hyperlinks to quickly get to the section of interest or you can scroll down to read them all.
Section: 0. Form
Section: 1. Identification of the Ranging System Reference Point (SRP)
Section: 2. Site Location Information
Section: 3. General System Information
Section: 4. Telescope Information
Section: 5. Laser System Information
Section: 6. Receiver System
Section: 7. Tracking Capabilities
Section: 8. Calibration
Section: 9. Time and Frequency Standards
Section: 10. Preprocessing Information
Section: 11. Aircraft Detection
Section: 12. Meteorological Instrumentation
Section: 13. Local Ties, Eccentricities, and Collocation Information
Section: 14. Local Events Possibly Affecting Computed Position
Section: 15. On-Site, Point of Contact Agency Information
Section: 16. Responsible Agency (if different from 15.)
Section: 17. More Information
ILRS Site and System Information Form
International Laser Ranging Service
0. Form
Prepared by (Full Name) : Man-Soo Choi
Preparer E-mail : cmsoo@kasi.re.kr
Date Prepared : 2024-07-26
Report Type : UPDATE
Site Log Format Version : 2.0
Site Log Revision :
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1. Identification of the Ranging System Reference Point (SRP)
Site Name : Sejong
IERS DOMES Number : 23907S002
CDP Pad ID : 7394
Subnetwork : WPLTN
Description : AZ EL INTERSECT
Monument Description : N.A.
Monument Inscription : N.A.
Mark Description : N.A.
Date Installed : 2015-08-07
Date Removed :
Geologic Characteristic : BEDROCK
Additional Information : DAEK station was moved to the SEJL station.
: SEJL is located in Sejong city.
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2. Site Location Information
City or Town : Sejong
State or Province : Sejong
Country : Republic of Korea
Tectonic Plate : Eurasian
Local Time (UTC +/- hours) : 9
Approximate Position
X coordinate [m]: -3110108.3836
Y coordinate [m]: 4082170.2894
Z coordinate [m]: 3774911.7489
Latitude [deg]: 36.520991 N
Longitude [deg]: 127.302913 E
Elevation [m]: 176.415
Survey Method :
Date Measured :
Additional Information :
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3. General System Information
3.01 System Name : Sejong
4-Character Code : SEJL
CDP System Number : 26
CDP Occupation Number : 01
Eccentricity to SRP (if Not Identical With SRP)
North [m]:
East [m]:
Up [m]:
Date Measured : N.A.
Date Installed : 2015-08-07
Date Removed :
Additional Information :
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4. Telescope Information
4.01 Receiving Telescope Type : CASSEGRAIN
Aperture [m]: 0.4
Mount : AZ-EL
Date Installed : 2015-07-10
Date Removed :
Xmitting Telescope Type : REFRACTOR
Aperture [m]: 0.1
Date Installed : 2015-07-10
Date Removed :
Tracking Camera Type : CCD
Model : PCO1600 for day; WAT-120N for night
Manufacturer : PCO for day; Watec for night
Field of View [deg]: 0.08
Minimum Magnitude [mag]: N.A.
Date Installed : 2011-08-10
Date Removed :
Transmit/Receive Path : SEPARATE
Transmit/Receive Switch : NONE
Max Slew Rate Az [deg/s]: 20
Max Slew Rate El [deg/s]: 10
Max Used Tracking Rate Az : 20
Max Used Tracking Rate El : 10
Telescope Shelter : DOME
Daylight Filter Type : SPECTRAL FILTER, No Oven Control
Dayl. Filt. Bandwidth [nm]: 0.27
Adjustable Attenuation : NO
Adjustable Field of View : NO
Transmit Efficiency : 92.3
Receive Efficiency : 64.9
Date Installed : 2015-08-07
Date Removed :
Additional Information :
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5. Laser System Information
5.01 Laser Type : ND:YAG
Model : RG-L-532
Manufacturer : Photonics Industries
Number of Amplifiers : 2
Primary Wavelength [nm]: 1064
Primary Maximum Energy [mJ]:
Secondary Wavelength [nm]: 532
Secondary Max. Energy [mJ]: 2.5
Xmit Energy Adjustable : NO
Additional Information :
Pulse Width (FWHM) [ps]: 50
Max. Repetition Rate [Hz]: 5000
Fullw. Beam Divergence ["]: 5 - 200
Theoretical Beam Div : N.A.
Measured Beam Div : N.A.
Method Used : N.A.
Additional Information :
Final Beam Diameter [m]: 0.08
Eyesafe : NO
Eyesafe Standard : N.A.
Polarization on Exit : UNKNOWN
Laser Fire Control : CONTROLLED
Laser Energy Monitor : OCCASSIONAL
Start Diode Type : pin diode
Manufactorer : KASI
Model : N.A.
Quantum Efficiency [%]: N.A.
Rise/Fall Time [ps]: 35ps/5
Date Installed : 2012-09-15
Date Removed : N.A.
Signal Processing : Pulse Distrubution Unit
Manufacturer : KASI
Model : N.A
Date Installed : 2012-09-26
Date Removed :
Additional Information :
Date Installed : 2012-09-26
Date Removed :
Additional Information :
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6. Receiver System
6.01.01 Primary Chain
Wavelength [nm]: 532
Detector Type : CSPAD
Manufacturer : PESO Consulting
Model : N.A.
Quantum Efficiency [%]: 20
Nominal Gain : N.A.
Rise Time [ps]: 100
Jitter (Single PE)[ps]: 20
Field of View Diam ["]: 90
Date Installed : 2012-09-26
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain : N.A.
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing : Time Walk Compensated
Manufacturer : PESO Consulting
Model : N.A.
Date Installed :
Date Removed :
Amplitude Measurement : NO
Return-Rate Controlled: NO
Mode of Operation : SINGLE to FEW PHOTON
Additional Information:
Time of Flight Observ. : EVENT
Manufacturer : Inst. of Electr. and Computer Science, Riga
Model : A033-ET
Resolution [ps]: 1
Precision [ps]: 4
Date Installed : 2012-09-26
Date Removed :
Additional Information :
6.02.01 Secondary Chain
Wavelength [nm]:
Detector Type :
Manufacturer :
Model :
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed :
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled:
Mode of Operation :
Additional Information:
Time of Flight Observ. :
Manufacturer :
Model :
Resolution [ps]:
Precision [ps]:
Date Installed :
Date Removed :
Additional Information :
6.03.01 Tertiary Chain
Wavelength [nm]:
Detector Type :
Manufacturer :
Model :
Quantum Efficiency [%]:
Nominal Gain :
Rise Time [ps]:
Jitter (Single PE)[ps]:
Field of View Diam ["]:
Date Installed :
Date Removed :
Amplifier Type :
Manufacturer :
Model :
Gain :
Bandwidth :
Date Installed :
Date Removed :
Additional Information:
Signal Processing :
Manufacturer :
Model :
Date Installed :
Date Removed :
Amplitude Measurement :
Return-Rate Controlled:
Mode of Operation :
Additional Information:
Time of Flight Observ. :
Manufacturer :
Model :
Resolution [ps]:
Precision [ps]:
Date Installed :
Date Removed :
Additional Information :
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7. Tracking Capabilities
7.01 Satellites
Very Low Alt (<400 km) : YES
Low Altitude (400-2000) : YES
LAGEOS/LARES : YES
GLONASS : NIGHT
Etalon : NIGHT
GNSS : NIGHT
Geosynchronous : NO
Moon : NO
Ave. Pass Switch Time [s]: 30
Average values for LAGEOS
Single Shot RMS [mm]: 15
# of Obs per NP : 300
Use of Semi-trains : NO
# of Semi-train Tracks : N.A.
Range Gate Width [ns]: 100 - 6000
Beam Pointing Accuracy ["]: 5
Angle Encoder Resolution["]: 0.02
Min. Tracking Elev. [deg]: 20
Laser Polarization @emitter: UNKNOWN
Operation
Months per Year : 12
Days per Week : 7
Hours per Day : 24
Staff per Shift : 1
System Shared With : NOTHING
Time Allocated to SLR [%]: 100
Remotely Controllable : NO
Tracking Restrictions
Go/No-go flag : NO
Satellite Verification : NONE
Date Verified :
Maximum elevation : YES
Satellite Verification : NONE
Date Verified :
Pass segments : YES
Satellite Verification : NONE
Date Verified :
Schedule segments : YES
Satellite Verification : NONE
Date Verified :
Maximum laser power limit: NO
Satellite Verification : NO
Date Verified :
Date First Applicable :
Date Last Applicable :
Additional Information :
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8. Calibration
8.01 Calibration Type : PRE+POST
Target Location : EXTERNAL WITHIN DOME
Target Type : Prism and Diffuser
Target Structure : METAL POLE
Number of Targets : 1
Target Distance(s) [m]: 1.07
Date Measured : 2012-09-26
Accuracy [mm]: 0.5
Verification : Multiple lines
Return-Rate Controlled : NO
Eye-Safe Method : OTHER
Additional Information :
Mode of Operation : FEW PHOTON
Calibration performed : 60
Single Shot RMS [mm]: 4.5
Edit Criterion 1st Chain : ITERATIVE 2.2 SIGMA
Edit Criterion 2nd Chain : N.A.
Application of Cal Data : LINEAR FIT
Date Installed : 2012-09-26
Date Removed :
Additional Information : Target consists of a prism and a diffuser
: to reduce the beam strength
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9. Time and Frequency Standards
9.01.01 Frequency Standard Type : RUBIDIUM
Model : XLi
Manufacturer : SYMMETRICOM
Short Term Stab. [e-12]: 6
Long Term Stab. [e-12]: 1
Time Reference : GPS
Synchronization : GPS
Epoch Accuracy [ns]: 30
Date Installed : 2012-09-26
Date Removed :
Additional Information :
9.02.01 GNSS Timing Rcvr Model : XLI
Manufacturer : SYMMETRICOM
Date Installed : 2012-09-26
Date Removed :
Additional Information :
9.03.01 One-way System Calibration
Date performed :
Direction Calibrated :
Additional Information :
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10. Preprocessing Information
10.01 On-site NP Generation : YES
Data Screening : CPF+POLYNOMIAL
Return-Rate Rejection : NONE
Edit Criterion 1st Chain : ITERATIVE 2.2 SIGMA
Edit Criterion 2nd Chain : NONE
Upload interval : DAILY
Date First Applicable : 2012-10-12 10:00 UT
Date Last Applicable :
Additional Information :
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11. Aircraft Detection
11.01 Detection Type : RADAR
Manufacturer/Provider : Honeywell
Automatic Laser Shutoff : YES
Alarms Recorded : YES
Hazard Distance [km]: 40
Date Installed : 2012-09-26
Date Removed :
Additional Information :
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12. Meteorological Instrumentation
12.01.01 Pressure Sensor Model : WXT520
Manufacturer : VAISALA
Recording Interval : EVERY MINUTE
Accuracy [mbar]: 0.5
Height Diff to SRP [m]: 0.2
Distance from SRP [m]: 6
Date Installed : 2012-09-26 00:00 UT
Calibration Interval : TWO YEARLY
Date Removed :
Additional Information :
12.02.01 Temp Sensor Model : WXT520
Manufacturer : VAISALA
Recording Interval : EVERY MINUTE
Accuracy [deg C]: 0.3
Date Installed : 2012-09-26 00:00 UT
Calibration Interval : TWO YEARLY
Date Removed :
Additional Information :
12.03.01 Humidity Sensor Model : WXT520
Manufacturer : VAISALA
Recording Interval : EVERY MINUTE
Accuracy [% rel h]: 3
Date Installed : 2012-09-26 00:00 UT
Calibration Interval : TWO YEARLY
Date Removed :
Additional Information :
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13. Local Ties, Eccentricities, and Collocation Information
13.01 Collocated Permanent Geodetic Systems
13.01.01.01 GNSS : IGS
Date Installed : 2012-02-15
Date Removed :
Additional Info :
13.01.01.02 GNSS :
Date Installed :
Date Removed :
Additional Info :
13.01.02.01 DORIS :
Date Installed :
Date Removed :
Additional Info :
13.01.03.01 PRARE :
Date Installed :
Date Removed :
Additional Info :
13.01.04.01 VLBI : YES
Date Installed : 2012-03-27
Date Removed :
Additional Info :
13.01.05.01 Gravimeter :
Date Installed :
Date Removed :
Additional Info :
13.01.06.01 Other SLR :
Date Installed :
Date Removed :
Additional Info :
13.02.01.01 Local Ties from the SRP to Other Monuments or Systems on Site
Monument Name : SEJN
Instrumentation Type : GPS
Instrumentation Status : PERMANENT
DOMES Number : 23907M001
CDP Number : N.A.
Differential Components (ITRS)
dx [m]: 24.996 +- 0.01
dy [m]: -74.281 +- 0.01
dz [m]: 113.619 +- 0.01
Date Measured :
Determined by :
Date Installed :
Date Removed :
Additional Information :
13.02.02.01 Local Ties from the SRP to Other Monuments or Systems on Site
Monument Name : VLBI, SEJONG
Instrumentation Type : VLBI
Instrumentation Status : PERMANENT
DOMES Number : 23907S001
CDP Number : 7368
Differential Components (ITRS)
dx [m]: 27.089 +- 0.01
dy [m]: -101.419 +- 0.01
dz [m]: 166.989 +- 0
Date Measured :
Determined by :
Date Installed :
Date Removed :
Additional Information :
13.03.01.01 Eccentricities Between Other Monuments on Site
From: Monument Name : SEJN
DOMES Number : 23907M001
CDP Number : N.A.
To: Monument Name : VLBI, SEJONG
DOMES Number : 23907S001
CDP Number : 7368
Differential Components (ITRS)
dx [m]: 2.093 +- 0.01
dy [m]: -27.138 +- 0.01
dz [m]: 53.370 +- 0.0
Date Measured :
Determined by :
Additional Information :
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14. Local Events Possibly Affecting Computed Position
14.01 Date :
Event :
Additional Information :
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15. On-Site, Point of Contact Agency Information
Agency : Korea Astronomy and Space Science Institute
Mailing Address : 776 Daedeok-Daero Yuseong-gu Daejeon
: 305-348 Republic of Korea
Website : http://slr.re.kr/en/default.aspx
Primary Contact
Contact Name : Man-Soo Choi
Telephone (primary) : +82-42-865-3244
Telephone (secondary) :
Fax : +82-42-861-5610
E-mail : cmsoo@kasi.re.kr
Secondary Contact
Contact Name : Ki-Pyoung Sung
Telephone (primary) : +82-42-865-2079
Telephone (secondary) :
Fax : +82-42-861-5610
E-mail : kpsung@kasi.re.kr
Tertiary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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16. Responsible Agency (if different from 15.)
Agency :
Mailing Address :
Primary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Secondary Contact
Contact Name :
Telephone (primary) :
Telephone (secondary) :
Fax :
E-mail :
Additional Information :
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17. More Information
URL for More Information : http://www.kasi.re.kr
Hardcopy on File
Site Map : NO
Site Diagram : NO
Horizon Mask : NO
Monument Description : NO
Site Pictures : NO
Additional Information :
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Sejong: Meteorological data
Note: For a larger view, please select a thumbnail.
| Type | Since 2012 | Monthly Average Offset |
|---|---|---|
| Temperature |  |
 |
Humidity |  |
 |
| Pressure |  |
 |
Sejong: LAGEOS performance
Note: For a larger view, please select a thumbnail.
| type | Since 2012 | Monthly average |
|---|---|---|
| RMS |  |
 |
| Cal RMS |  |
|
| Sys Dly |  |
 |
| Obs per NPT |
 |
 |
| FR Obs per Pass |
 |
 |
Sejong: 7-day tracking information
Click on a plot to view a larger image.
| Days ago | |
|---|---|
| 1 |  |
| 2 |  |
| 3 |  |
| 4 |  |
| 5 |  |
| 6 |  |
| 7 |  |
Sejong: Satellite Information (as a function of local time and satellite range)
Click on a plot to view a larger image.
| satellite | local time | range | ||
|---|---|---|---|---|
| npt rms | numFR /npt | npt rms | numFR /npt |
|
| Ajisai 30 sec |
 |
 |
 |
 |
| Cryosat-2 15 sec |
 |
 |
 |
 |
| Etalon-1 300 sec |
 |
 |
 |
 |
| Etalon-2 300 sec |
 |
 |
 |
 |
| Galileo-102 300 sec |
 |
 |
|
 |
| Galileo-202 300 sec |
 |
 |
|
 |
| Galileo-209 300 sec |
 |
 |
|
 |
| Galileo-210 300 sec |
 |
 |
|
 |
| GLONASS-131 300 sec |
 |
 |
 |
 |
| GLONASS-134 300 sec |
 |
 |
 |
 |
| GLONASS-138 300 sec |
 |
 |
 |
 |
| GLONASS-139 300 sec |
 |
 |
 |
 |
| GRACE-FO-1 5 sec |
 |
 |
 |
 |
| GRACE-FO-2 5 sec |
 |
 |
 |
 |
| Jason-3 15 sec |
 |
 |
 |
 |
| LAGEOS-1 120 sec |
 |
 |
 |
 |
| LAGEOS-2 120 sec |
 |
 |
 |
 |
| LARES 30 sec |
 |
 |
 |
 |
| Starlette 30 sec |
 |
 |
 |
 |
| Stella 30 sec |
 |
 |
 |
 |
| Swarm-A 5 sec |
 |
 |
 |
 |
| Swarm-B 5 sec |
 |
 |
 |
 |
| Swarm-C 5 sec |
 |
 |
 |
 |
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