(ATBD) SMAP Level 1 Radar Data Products - NASA
(ATBD) SMAP Level 1 Radar Data Products - NASA
(ATBD) SMAP Level 1 Radar Data Products - NASA
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Table 13: Calibration Error Table<br />
Parameter Error Allocation Calibration Method<br />
λ 2 < 0.01 dB Design, Could verify with clock drift<br />
measurement<br />
R 4 < 0.01 dB Nav/Ephemeris determination<br />
G a - pointing errors 0.22 dB Pre-launch measurement, pointing<br />
stability reqmt<br />
G a - feed, antenna stability 0.07 dB Pre-launch measurement, antenna stability<br />
reqmt, post launch antenna<br />
model fitting<br />
P t G r 0.1 dB Internal loopback measurements<br />
L - outside of loopback 0.1 dB Pre-launch temperature models, postlaunch<br />
correction<br />
L - shared components (rotary joint, feeds) 0.1 dB Pre-launch temperature models, postlaunch<br />
correction<br />
P s - noise subtraction 0.1 dB Design, noise only data<br />
P s - ambiguity/PSF contamination 0.1 dB Design, noise only data<br />
P s - Faraday rotation 0.1 dB Use radiometer derived correction<br />
A res 0.1 Processing algorithm<br />
RSS of above terms 0.35 Applies on short (1 month) time scale<br />
X - long term variability 0.2 Use reference target (Amazon) to<br />
track<br />
RSS of above two terms 0.4 Total K pr