SU320CSX
4110-0446, Rev. B
Page 47 of 96
© 2016 UTC Aerospace Systems
Date Printed: 5-Dec-2016
This document does not contain any export controlled technical data.
CORR:OFFSET:CAL
-- acquire cal offset data based on 32 (default value) frames and
save in camera live (volatile) memory.
5.9.
Automatic Gain Control (AGC) Commands
The Automatic Gain Control (AGC) algorithm monitors frame statistics on every frame and selects the
operational configuration (OPR number) to achieve the best camera sensitivity settings for the given
imaging scene. When AGC is enabled, operational configurations can be loaded using the OPR command
(Section 5.5.3). However, the AGC algorithm will override the user set operation configuration if the
scene data falls outside of the AGC requirements for that OPR. Therefore, it is best to disable the AGC
when manually adjusting the operational configuration (OPR). The OPR? command can be used to poll
the current operational configuration setting.
The AGC operates within groups of OPRs of a related temperature setpoint. These OPR groups are
delimitated by the Macro group. See the separate Appendix B document for a table of OPRs and details
on the MACRO command settings. See Section 5.20 for details on the MACRO command itself.
TEC Setpoint (°C)
MACRO
Low Case
Temperature (°C)
High Case
Temperature (°C)
18 0 -40
35
32 1 0 55
45 2 20 70
For the standard configuration, there are more than one focal plane array setpoint temperatures available
for AGC operation, as shown in the table above. By default, the camera loads MACRO0, which
corresponds to the lowest FPA setpoint. This allows for the highest sensitivity operation, but may also
show image persistence in certain scenes. If the case temperature is expected to exceed 35°C, or if image
persistence is an issue, it is best to run MACRO1, which utilizes the median focal plane array temperature
setpoint for standard sensitivity with low lag (image persistence) performance. If the camera case
temperature is expected to exceed 55°C, it is recommended to change the focal plane array setpoint to the
high temperature AGC setting with MACRO2 to assure thermal stability of the focal plane array for
elevated camera case temperatures.
The user can select among the different AGC ranges by using the MACRO command as described in
Section 5.20. Macros are created by the factory and listed in Appendix B (attached on hard copy of
manual, and located as a separate file on the CD shipped with your camera).
Note:
The image enhancement algorithm is not recommended for windowing operation or enhancement
of uncorrected data.
