1 / 11

Satellite Instrument Status and Performance Review

Detailed review of satellite instruments' operational status, performance, and recent improvements with excellent stability and calibration techniques.

merrittc
Download Presentation

Satellite Instrument Status and Performance Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. INSTRUMENTSTATUS AND PERFORMANCE Guido Levrini

  2. ASAR • No TRM failure since launch (4 TRM’s lost in Tx due to PSU) • Excellent instrument stability (~0.2 dB, better than expected) • Antenna patterns completely characterized (all beams/ all pol *) • Instrument operability issues solved: • Echo shift -> fine tuning of on board parameters • Historic swath parameters (‘Neustrelitz effect’) • N-2 timing patch • Incorrect Wave mode exit -> solved by MP rules • Wave mode switch down -> patch • AP mode SWST annotations -> patch • Incorrect GMM exit -> hopefully solved this week! • Instrument completely operable: no remaining open problem * All HH, VV, VH beams 5/7 HV beams

  3. MERIS • Instrument availability: ~ 100% • Calibration technique & mechanism: perfectly working • Spectral calibration: characterization confirmed (± 1 Å) by recent spectral campaigns (begin Nov) • Spectral stability: excellent • Radiometric calibration: very good overall stability. • Slow degradation in the blue (@412 nm) -> now in the order of 2 % • Smile correction fully verified -> under implementation in Level 1b.

  4. AATSR • Nominal operations, 100% instr. availability • Temperatures nominal, Cal S/S OK, Coolers functioning nominally, Blanking Pulses OK • Scan mechanism: small jitter (on occasions) • Spectral calibration: OK • Pointing characterization: OK • Dynamic range (all channels) optimized • Radiometric stability: visible channels affected by water condensation. • Outgassing: water removed each time, it comes back at lower rate -> we gradually -but inefficiently - get rid of the water

  5. RA-2 • Over Ice: excellent tracking capabilities • Over Ocean: excellent range noise performance (1.8 cm) • On board parameters optimized: no change since Cal Review • S band accumulation anomaly cured by operational work-around • Datation correction implemented in Level 1b • Absolute Sigma zero calibration (1st time ever) -> the computed bias is: • Range Absolute Calibration • all data collected • analysis to be finalized (to reduce error bars)

  6. DORIS / LRR / MWR • DORIS Orbit radial accuracy (rms) • Navigator: < 30 cm • Preliminary (2d): < 5 cm • Precise (20d): < 3 cm • LRR: good laser coverage • MWR • 23.8 GHz channel perfectly stable • Suspected slow drift of the 36.5 GHz channel: under investigation

  7. MIPAS • Good NESR performance • Detector non linearity in spec (lower end of dynamic range under optimization) • Radiometric stability: in spec, but affected by ice formation After warm-up, the water builds up slower -> periodic decontamination • In-flight ILS within budget L2 more sensitive than expected -> scheme under improvement • Spectral calibration: OK (including refined NL component in L2) • Pointing: OK. Update on 13 Nov (~25 mdeg in pitch). LOS OK • FOV characterization: OK (using the planet Mercury). • Cooler Anomaly (6-22 Aug, 1-11 Oct). No H/W problem. VCS sensitive to environmental conditions -> Use coarse balancing only.

  8. GOMOS • Good instrument operability • Excellent tracking capabilities (down to 3 km!) • Radiometric stability: excellent • Spectral calibration: OK (± 1/30 pixel) • Spectral stability: excellent • No ghosts on the CCD • CCD sensitive to proton radiation (-> hot pixels and RTS): • operating temperature decreased (+10 -> -4 C, minimum achievable) • dark charge calibration approach changed (every orbit now) • ground processing under update • Independent CCD Expert Investigation Board set-up

  9. SCIAMACHY • All mechanisms working • ‘Flash’ Ice decontamination (during ‘Leonids’) worked. • Dark current stability: excellent in ch.1-6, affected by ice in ch.7-8 • Straylight: Ok in nadir for ch.1-6. Ch.7-8 under investigation • Etalon correction: OK. • PPG: OK for ch. 1-6, under investigation for ch. 7-8. • Spectral calibration: excellent stability • Sun mean reference: recently determined offset under investigation (does not affect DOAS) • Polarization: Nadir is OK, Limb just starting.

  10. CALENDAR OF MAIN PROCESSOR UPGRADES N. B. = Updates of Aux Data files to be added

More Related