Sequencer Site SIRTF IOC Activity c. 2002

CAID: MIPS-111 Title: 70 um On-board Data Processing Algorithms
 
System: MIPS Principal: alberto Deputy: dfrayer, SStolovy
Objective:   
To ensure that the on-board command 
sequences
expand appropriately and that the data
manipulation of
70um array behaves as expected. (e.g. SUR, 
RAW and
CO-ADDing modes).
 
Description: 
Commands wil be iussed that get expanded 
on board
of the spacecrfat. The telemetry will be 
monitored
to ensure that the correct commands were
performed.

A modified  70um Photometry AORs(3sec) will 
be
used
to observed the same star in SUR, RAW,
CO-ADD=2,4,8
 
Day:   42.4708333333401 Suggested Order:   G500
 
Must be preceded by these activities (list by CAID):   MIPS-322
 
Place in Schedule:   The telescope has to be cold enough to measure standard stars at 70um
 
Priority:   Critical

Conditions

Maximum telescope temperature: 12 K
 
Minimum telescope temperature: 5.5 K
 
Should activity be repeated if focus changes?   No     Repeat if focus changes by 0 mm
 
Maximum absolute pointing uncertainty: 60 arcsec (1 sigma radial)
 
Maximum precision offset uncertainty: 60 arcsec  (1 sigma radial)
 
Observatory configuration:
 
Go/No Go criteria:

Resources

Duration:   15 minutes
 
Real time downlink:   No   

Data Volume (uncompressed): 96 Mbits
 
List Blocks, AORs, SERs, IERs, or unique sequences required (uplink):
 
List Analysis tools required (downlink):   Standard Software tools from IRAF and IDL will be used to analyze the fits files

Outcome

Estimate of data turn around:   0 hours
 
Description: Data products: BCDs
 
Can proceed in parallel with other activity: No
 
Must outcome be confirmed before next activity: No
 
Method of Confirmation:   SUR and Raw models are identical in function for Ge, so their BCDs should reflect that. Ratio or difference of the BCDs should be enough to show discrepancy. Co-adding reduces dowlink volume, but otherwise should produce also identical BCDs, so same method will be applied.
 
 
Success criteria: The BCDs should be pretty much the same. Cosmic Rays will be the source of largest uncertainty, and at this point is impossible to quantify their effect (although we hope is not large).
 
Contingency plan:  (1) If co-adding fails. This is not a big issue for 70um, since this observing mode is not use during normal operation. (2) If either Raw or SUR fails. It can be replaced by either mode. (3) If we can not take data using our commands, this a major issue and should be brought up to the highest decision making level because there is not an obvious "work around".
 
 

Comments

 
References:  
 
Additional Comments:
 
This activity last updated: 10/8/2002 9:47:33 AM