CYGNSS Competed Science Team (ROSES 2017)

Funding Agency:
National Aeronautics and Space Administration

The Cyclone Global Navigation Satellite System (CYGNSS) was successfully launched into low Earth orbit on 15 December 2016. CYGNSS consists of a constellation of eight satellites, each carrying a four-channel bistatic radar receiver that measures GPS signals scattered by the Earth’s surface. The common orbit plane of the constellation is inclined by 35 degrees from the equator, resulting in Earth coverage from 38 N to 38 S latitude. The satellites produce three primary science data products. A Level 1 product is the scattering cross section of the surface over both the ocean and land, with 10-15 km spatial resolution; a Level 2 product is the 10 m referenced neutral stability wind speed over the ocean, with 25 km spatial resolution; and a Level 3 product is a gridded version of the Level 2 winds, with 0.25 deg lat/lon resolution. In each case, temporal sampling is characterized by a median revisit time of 3 hours and a mean revisit time of 7 hours. Use of the GPS L1 navigation signal at 1575 MHz (19 cm wavelength) scattered from the ocean surface results in wind measurements that are largely insensitive to scattering or attenuation by intervening precipitation. Further details about the CYGNSS mission are available at The CYGNSS level 1, 2 and 3 data are being archived at the Physical Oceanography Distributed Active Archive Center at the NASA Jet Propulsion Laboratory At the present time, the CYGNSS data are being released with a latency of approximately 6 days. Here, data latency is defined as the elapsed time from the downlink of raw data to the public availability of processed Level 2 data products.

The CYGNSS mission was originally conceived to support improved sampling of ocean surface winds in tropical cyclones, by reducing the revisit time and lowering the sensitivity to precipitation relative to previous satellite-based wind observations, such as those from scatterometers. This ROSES element seeks to expand the utility of the CYGNSS measurements by demonstrating other scientific uses and end-user applications of the mission’s science data products; successful proposers will become members of the Competed CYGNSS Science Team.

This program element has eligibility requirements involving the type of data that may (and must) be used in the proposed activities and there are special requirements on current CYGNSS science team members and proposers from federal agencies other than NASA. All proposers are strongly encouraged to carefully read Section 4 Eligibility and Evaluation Criteria.


  • Notice of Intent: Sep. 8, 2017
  • Proposal: Nov. 8, 2017




Engineering and Physical Sciences
Environmental & Life Sciences

External Deadline

November 8, 2017