AMSU-A engineering model calibration
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


AMSU-A engineering model calibration

Filetype[PDF-32.98 MB]

Select the Download button to view the document
This document is over 5mb in size and cannot be previewed


  • Description:
    Thermal-vacuum calibration data generated from the Advanced Microwave Sounding Unit-A (AMSU-A) Engineering Model (EM) were analyzed for assessing the instrument's performance and the results were compared to the required specifications. A new calibration algorithm, which represents a scene target-view radiance in terms of radiometric counts was developed and rested with the calibration data. Nonlinear contribution due to an imperfect square-law detector was incorporated into the calibration algorithm via a nonlinearity parameter, [mu], of which values were determined by least-squares fit of a set of data taken at a fixed instrument temperature. The analysis covers the calibration accuracy, nonlinearity, and radiometric temperature sensitivity (NE[delta]T). We found that all specifications are met by the results derived from the thermal-vacuum chamber test data, except that the NE[delta]T values (0.34K and 0.52K) at channels 9 and 15 (57.29 and 89.0 GHz), which exceed the required specification of 0.25K and 0.5K, respectively, for the two channels. The manufacturer found that the large NE[delta]A value at channel 9 was due to un-optimized mixer and its requirement was waived. The NE[delta]T value at channel 15 exceeds the limit by a small margin and probably meets the requirement within measurement uncertainty. For each channel, a warm target fixed bias correction factor, which plays an important role in this analysis, is incorporated into the calibration algorithm. These fixed bias correction factors (supplied by Aerojet) also depend on the instrument temperatures. This analysis of the AMSU-A data provides us with a better understanding of the instrument's functioning. Experience and information gained from this work provide useful insights into the development of computer software for processing the NOAA-K, L, M, data collected from space in the future.
  • Content Notes:
    Tsan Mo, Michael P. Weinreb and Norman C. Grody.

    "June 1993."

    Also available online in PDF via the NOAA Central Library.

  • Document Type:
  • Rights Information:
    Public Domain
  • Compliance:
  • Main Document Checksum:
  • File Type:

Supporting Files

  • No Additional Files

More +

You May Also Like

Checkout today's featured content at

Version 3.26