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SLR  Satellite Laser Ranging Systems  


KASI has developed two SLR systems, called Sejong and Geochang. The Sejong station has been a member of the International Laser Ranging Service (ILRS) tracking network since 2015 as well as the core station of the Global Geodetic Observation System (GGOS) since 2017. The Sejong core station consists of a Very Long Baseline Interferometry (VLBI) system, a Global Navigation Satellite System (GNSS), and a SLR system. The Geochang station was established in 2018, which contributes to the ILRS tracking network and supports Korean space missions. They utilize the most accurate ranging technique for satellites and space debris and are going to provide crucial technologies for many space applications. 



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                                                                                                                                                                                                     source: https://ilrs.cddis.eosdis.nasa.gov/network/stations/index.html

                                                          

Mission and System Specification

The SLR team at KASI has been operating the Sejong station with mm level accuracy for research on space geodesy geophysics and precise orbit determination. The Sejong system has a separate Coude optical path using 40cm (Rx), 10cm (Tx) and an aperture telescope. Its ranging capability is  250km to 25,000km. The Geochang system (under operational test and validation) has the common Coude optical path using 100cm aperture telescope. Its ranging capability is 300km to 36,000km which includes Geostationary Earth Orbit (GEO) satellites. Especially, an adaptive optical equipment attached to the system could obtain images of satellites brighter than 10th magnitude.




Target Satellite


Targets of SLR systems are satellites equipped with laser reflectors or dedicated to geodesic researches. Most of target satellites are launched by US, Japan, and Russia. Three Korean satellites are now available for SLR targetting, which are STSAT-2C, COMPSAT-5, and GK-2B. 


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Observation Result

The observed data indicates the observation time for the residuals between the measured laser pulse time of flight and the predicted time of flight. These were generated from processing program separately.

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 Observatory Information : Sejong Station

  - Site Name : Sejong Satellite Laser Ranging Observatory(SEJL)

  - Monument : 7394
  - Location : Sejong City, Republic of Korea
  - CDDIS SOD : 23907S002



 Observatory Information : Geochang Station 

  - Site Name : Geochang Satellite Laser Ranging Observatory(GEOL)  

  - Monument : 7395

  - Location : Geochang City, Republic of Korea
  - CDDIS SOD : 23910S001




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