The primary objective of this work is to define the next generation sensor: a sensor that will continue the measurement of ocean salinity demonstrated by Aquarius and will address issues identified in current observations, such as:
a. The need to reduce uncertainty in cold water;
b. The need for improved spatial resolution to address applications in the coastal zone and near the ice edge where effects of climate change are most likely to be important.
The general approach is to examine options for improved spatial resolution (e.g. better antennas and/or interferometry) and frequencies in addition to the primary L-band to improve accuracy of the science product. Specifically, this work will:
1) Define the science requirements and associated instrument performance requirements;
2) Conduct a science/engineering study to identify risks and benefits in the choice of observing frequencies (P-band, L-band, S-band, C-band);
3) Conduct a trade study to inform the choice between a single, multi-octave feed and optimized, single-frequency ones;
4) Review technology to define options among pushbroom and conical scanning conventional radiometers and interferometric radiometers [Martin-Neira et al., 2014];
5) Assuming a conventional radiometer, identify a preliminary design for the primary reflector antenna and the illuminating feed(s);
6) Determine the need for a passive (radiometer) and active (radar) combination and if so, at which frequencies.
This study will cover the early stages of instrument development, outlining a reasonable approach to a future mission with the aim of enhancing Goddard’s competiveness in the competition for a future flight implementation. It will also assess the present-day TRL of key technologies, to help identify areas where development funds could be more fruitfully invested.
At the end of this project we will have gained a better understanding of the design requirements and technology challenges for the next-generation sea salinity instrument.
The goals of the FY2018 research are to:
A follow-on salinity instrument has been among the white papers submitted to the National Research Council’s Decadal Survey. The work performed here will help to position GSFC to win potential future competition for such a mission by providing a well-conceived integrated package of scientific requirements and technological developments.
Acquisition of the technical know-how for multi-feed beam synthesizing will benefit on-going and planned research on soil-moisture from towers and airborne platforms by enabling the use of compact aerials.More »
|Organizations Performing Work||Role||Type||Location|
|Goddard Space Flight Center (GSFC)||Lead Organization||NASA Center||Greenbelt, MD|