CYGNSS Level 1 Full Delay Doppler Map Data Record

This Level 1 (L1) dataset contains the Full Delay Doppler Map (DDM) sensor data from the Delay Doppler Mapping Instrument aboard the CYGNSS satellite constellation. The primary CYGNSS instrument, also known as the Delay-Doppler Mapping Instrument (DDMI), measures the incoming radio frequency (RF) streams from three input antenna channels (2 nadir oriented science antennas and one zenith oriented navigation antenna) and processes them in real time into DDMs, which are two-dimensional maps of the signal scattered from the Earth surface as a function of propagation time delay and Doppler frequency shift. DDMs are normally sampled over a restricted range of delay and Doppler values centered on the values at the specular point of reflection. The bit resolution of scattered signal strength is also truncated by a lossy data compression algorithm. Full DDMs are sampled over a wider range of delay and Doppler values and retain their full (lossless) bit resolution. Full DDM data records are typically 10-15 min in duration and are initiated by ground commands to coincide with an overpass by one of the spacecraft of a target area of interest.

Data and Resources

Additional Info

Field	Value
Maintainer	Earthdata Forum
Last Updated	April 6, 2026, 19:29 (UTC)
Created	April 1, 2025, 15:17 (UTC)
accessLevel	public
bureauCode	{026:00}
catalog_conformsTo	https://project-open-data.cio.gov/v1.1/schema
harvest_object_id	6f8a5cac-35f3-41a8-8567-4b869d893c46
harvest_source_id	b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title	Science Discovery Engine
identifier	10.5067/CYGNS-L1FDD
license	https://www.usa.gov/government-works
modified	2026-03-30T22:16:00Z
programCode	{026:000}
publisher	NASA/ESSP/UMICH/CYGNSS;NASA/JPL/PODAAC
resource-type	Dataset
source_datajson_identifier	true
source_hash	5a69900b07bcd3cea0ba84f4b24cad7f3de1f59b399d743278ecca23689f2a90
source_schema_version	1.1
spatial	["CARTESIAN",[{"NorthBoundingCoordinate":40.0,"WestBoundingCoordinate":-180.0,"EastBoundingCoordinate":180.0,"SouthBoundingCoordinate":-40.0}]]
temporal	2017-08-19/2020-11-17
theme	{"Earth Science"}