Evaluating solar background and electronic noise for GEDI waveform detectors and optimizing signal detection
Abstract
Global Ecosystem Dynamics Investigation (GEDI) is a NASA mission to observe Earth's forests and topography from the International Space Station (ISS). GEDI instruments was successfully launched on December 5th, 2018 with the SpaceX Commercial Resupply Mission 16. On April 1, 2019, GEDI completed its commission phase and started science data acquisition phase. One major goal for GEDI is to make precise measurements of forest canopy height, canopy vertical structure, and surface elevation. It is vital to know the ground elevation to derive the canopy heights and vertical structure. While the majority of the ground elevation return signal in a waveform is above noise level, some of the ground elevation signal is comparable to the noise level. In this study, we analyzing night and day background noise of six GEDI waveform detectors; developing algorithms to filter out noise to detect ground returns. The noise only data (collected while GEDI lasers were intentionally turned off) of night and day time were analyzed. The GEDI waveform detector noise measured from its shot-to-shot noise window and its return waveform stretchers_x/y portions are also analyzed. The techniques of performing waveform four-bin-pattern bias correction, return waveform smoothing, and false alarm rate analysis are discussed. The algorithms are evaluated over various conditions and the results are compared with coincident data of NASA's Land, Vegetation, and Ice Sensor (LVIS).
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.B11E2363Y
- Keywords:
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- 0439 Ecosystems;
- structure and dynamics;
- BIOGEOSCIENCES;
- 0480 Remote sensing;
- BIOGEOSCIENCES;
- 1294 Instruments and techniques;
- GEODESY AND GRAVITY