NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Search and Rescue Satellite Aided Tracking System (SARSAT)

NSSDCA ID: 2005-018A-07

Mission Name: NOAA 18


The Search and Rescue Satellite Aided Tracking System (SARSAT) on the Advanced TIROS-N NOAA K-N series of polar orbiting meteorological satellites is designed to detect and locate Emergency Locator Transmitters (ELTs) and Emergency Position-Indicating Radio Beacons. The SARSAT instrumentation consists of two elements: the Search and Rescue Repeater (SARR) and the Search and Rescue Processor (SARP-2). The SARR is a radiofrequency (RF) system that accepts signals from emergency ground transmitters at three very high frequency (VHF/UHF) ranges (121.5 MHz, 243 MHz and 406.05 MHz) and translates, multiplexes, and transmits these signals at L-band frequency (1.544 GHz) to local Search and Rescue stations (LUTs or Local User Terminals) on the ground. The location of the transmitter is determined by retrieving the Doppler information in the relayed signal at the LUT. The SARP-2 is a receiver and processor that accepts digital data from emergency ground transmitters at UHF and demodulates, processes, stores, and relays the data to the SARR where they are combined with the three SARR signals and transmitted via L-band frequency to local stations.

Alternate Names


Facts in Brief

Mass: 24 kg
Power (avg): 53 W
Bit rate (avg): 2.4 kbps

Funding Agencies

  • Department of Defense-Department of the Air Force (United States)
  • NOAA National Environmental Satellite Service (United States)


  • Engineering: None assigned

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
[] NASA Logo -