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Active Sensor Information for Radio Astronomers

Here you will find information on active sensors for radio astronomers in order to help protect radio astronomy receivers from damaging interference.

Cloudsat Information

Per Resolution SFCG 24-2 (PDF, 160 KB), orbital information on the Cloudsat Mission utlizing the 94.0-94.1 GHz allocation can be found on the Cloudsat website. This includes both Cloudsat orbital elements and orbital predictions.

NOTE:The Cloudsat mission is still operational but is only operated during the sunlit portion of the orbit due to battery issues. It is expected to be operational into sometime in 2021.

Cloudsat orbital elements and orbital predictions will continue to be available on the Cloudsat website.

Two-Line Element Ephemeris Data

NORAD Two-Line Element (TLE) ephermeris data for Earth orbiting objects can be found here. Satellite tracking software is also available.

CEOS Earth Observation Handbook

The Committee on Earth Observation Satellites (CEOS) maintains an on-line version of its Earth Observation Handbook. This Handbook contains useful information on all Earth observation satellites currently operating.

ITU Database Information

The International Telecommunications Union - Radiocommunications Sector (ITU-R) maintains a database of all space systems (i.e., satellites) registered with the ITU. The Space Network Systems (SNS) database contains all technical information available in ITU filings for such systems.

Active Sensors Look-Up Table

Currently Operational Spaceborne Active Sensor Missions That Could Potentially Cause M/L to M/L Damage to RAS Station Receivers (Updated: May 2019)
MissionAgencyITU NameFrequency (MHz)Bandwidth (MHz)RadiatedPower (W)NORAD Catalog Number
Sentinel-1A and -1B(2 satellites active at 180 degrees orbital separation) (SAR)ESASentinel-15405Up to 100 (mode dependent)520039634 and 41456
ALOS-2 PALSAR-2JAXAALOS-21240, 1260, 128042/84.2/42.2612039766
RADARSAT-2 SARCSARADARSAT-2C RADARSAT-2D RADARSAT-2E RADARSAT-2F530011.6, 17.3, 30, 50, 100500032382
COSMO-SkyMed 1/2/3/4 (SAR)ASICOSMO SKYMED960041 to 400280031598/32376/33412/37216
TerraSAR-X SAR/TANDEM-X SARDLRTERRASAR9650150, 300226031698/36605
CLOUDSAT (CPR)NASAUSCLOUDSAT940500.36150029107
GPM DPR (Precipitation Radar)JAXAGPM13600, 355503.36 x 2 1000, 15039574
RISAT-1/-2 (SAR)ISRORISAT5250-547518.75 to 75400038248/34807
HJ-1C (SAR)CNCDR(CNSA)HJ-1-ABC32006030038997

This table is also available in MS-Word format. Additional information on the Metop sensors is also available. At SFCG-31, document SF31-9DR1 on "Potential Damage to RAS Sites by EESS (active) Systems" was presented by NASA providing calculations of the power levels received vis-à-vis power levels given in Report ITU-R RA.2188. At SFCG-36, a new Action Item was adopted to further refine this work.

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This page last updated on 28-May-19 at 13:15 ET