Spacecraft advanced passive microwave radiometry instrument makes use of natural thermal emissions to remotely sense Earth phenomena of interest to science in the L-band (soil moisture, for example). Soil moisture is a strategic parameter whilst 8” of soil feed 7.046 billion people. Here a terrestrial signal-to-space suffers less attenuation by the intervening canopy or atmosphere. Unfortunately, relative insensitivity of the L-band region to atmospheric effects also makes it an extremely attractive spectral range for wireless radar & cell communications that are causing radio frequency interference (RFI) with the signal of interest.
State-of-the-art radiometry technology detects an RFI event and deletes the entire contaminated measurement point. Excision of just the RFI component from the composite signal is presently a tall challenge task. This IRAD-FY14 will research and develop new technologies to solve this task based on the Hilbert-Huang Transform for two dimensions (2D HHT2).
The three goals of this IRAD are:
1.1 Research and develop the Hilbert-Huang Transform for 2D second and last component – the Hilbert Spectral Analysis for 2D (HSA2) and complete the HHT2 theory;
1.2 Develop the engineering tool for a direct decomposition of the RFI-contaminated signal into 2D or bi-dimensional Intrinsic Mode functions (BIMFs) and use the BIMFs to recover RFI-contaminated science data points by HSA2;
1.3 Verify the new technology tool prototype by a controlled drone experiment at Wallops, comprising a miniature radiometer, a controlled RFI source, and science data processing on the ground.More »
Direct RFI detection and mitigation will benefit science data recovery from RFI-events (%10 of science telemetry) for Soil Moisture Active Passive instruments Mission (SMAP Launch October 2014) and the Global Precipitation Mission (GPM Launched February 2014 ) carrying a radiometer imager susceptible to RFI noise.
This technology will also result in less complex on-board instrument data processing system within the electrical and electronics subsystem and ground system.
It will also allow to re-process heritage big data sets and recover RFI-contaminated measurements that couldn’t be done with the state-of-the-art.
Completion of the Hilbert-Huang Transform for 2D HSA2 components will open the door for using the HHT2 for spectral analysis of images for missions such as the Global Precipitation Mission (GPM) carrying a radiometer images susceptible to RFI noise.
Completion of the Hilbert-Huang Transform for 2D HSA2 components will open the door for using the HHT2 for spectral analysis of images for future missions.
This project will benefit Syneren Technologies and other industry entities involved in satellite image processing and reconstruction.
This project will benefit DoD Navy for underwater image reconstruction.More »
|Organizations Performing Work||Role||Type||Location|
|Goddard Space Flight Center (GSFC)||Lead Organization||NASA Center||Greenbelt, MD|
|Wallops Flight Facility (WFF)||Supporting Organization||NASA Facility||Wallops Island, VA|
|Syneren Technologies Inc.||Industry||Lanham, MD|