ENR 4.3   GLOBAL NAVIGATION SATELLITE SYSTEM(GNSS)

1. Overview of Satellite-Based Augmentation System(SBAS)
1.1 The Republic of Korea, developed the Korea Augmentation Satellite System(KASS) for supplement the GPS as a Satellite-based Augmentation System (SBAS) in compliance with ICAO SBAS Standards and Recommended Practices, and will provide safety of life services using the Korea Augmentation Satellite System (KASS) in Incheon Flight Information Region(FIR) for aviation.
1.2 KASS consists of a ground segment comprising 7 reference stations, 2 satellite communication stations, 2 central processing/control stations and wide area networks, and a space segment comprising 2 geostationary satellites(1~2), and uses the WGS-84 coordinate system.
1.3 KASS, in accordance with ICAO Annex 10 Vol.1, uses identification number 6 as the SBAS service provider, adhering to the System Integrity, Accuracy, and Continuity(SIS) requirements specified in ICAO Annex 10 Vol.1, 3.7.2.4.
1.4 KASS uses the L1(1575.42 MHz) and L5(1176.45 MHz) frequencies.
1.5 KASS is operated with a geostationary orbit satellite (MEASAT-3D) located at 91.5 degrees east longitude, using Pseudo Random Noise(PRN) Code 134. The second geostationary satellite is planned for operation after the 25th year.

System name

Frequencies

Geo Satellite

Service coverage

Management organization

Aviation service

Korea Augmentation Satellite System (KASS)

L1 : 1575.42 MHz

L5 : 1176.45 MHz

First Geo : Measat-3D, PRN Code 134

Incheon FIR

Korea Air Navigation Satellite Center,

Air traffic management office,

Ministry of Land, Infrastructure and Transport

En-route,

Terminal,

NPA,

RNP APCH

2. KASS Operational Information and Service
2.1 KASS user receivers must be complied with FAA/TSO (Technical Standard Order) C145, C146, or equivalent European TSO.
2.2 In case of anomalies in KASS signals or service unavailability due to the rapid changes of a GPS status, ionospheric disturbances, or planned maintenances, a NOTAM will be issued relevant information.
2.3 Aircraft operators and pilots planning RNP APCH LPV procedures must check NOTAMs in advance and consider KASS performance degradation or non-service periods.
2.4 In En-Route, Terminal using KASS service, the horizontal alarm limit is defined as 1 NM, In NPA, the horizontal alarm limit is defined as 0.3 NM, In APV (LPV) the horizontal alarm limit is defined as 40 m, and the vertical alarm limit is defined as 50 m.
2.5 With appropriate avionics, KASS will provide services supporting all phases of flight, including RNAV(GNSS) approaches such as LNAV, LNAV/VNAV, and LPV approach procedure within the service coverage.
2.6 Authorized charts for RNP APCH LPV procedures are included in the Aeronautical Information Publication(AIP) under the Airport section(AD section) for each airport.
2.7 Some locations near the edge of the KASS service coverage may have lower availability of approaches providing vertical guidance.
2.8 Contact Information

Pilots, air traffic service providers, or airport operators to require additional information about KASS signal provision or to report abnormal situations during KASS usage can contact the following address. :

Korea Air Navigation Satellite Center,

Air Traffic Management Office,

Ministry of Land, Infrastructure and Transport

Address : 230-8, Ipdong-ri, Naesu-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, 28142, Republic of Korea

TEL : +82-43-901-6400

FAX : +82-43-901-6448

In En-Route, Terminal using KASS service, the horizontal alarm limit is defined as 1 NM, In NPA, the horizontal alarm limit is defined as 0.3 NM, In APV (LPV) the horizontal alarm limit is defined as 40 m, and the vertical alarm limit is defined as 50 m.