NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Towards Automating Spacecraft Attitude Sensor CalibrationWith a view towards reducing cost and complexity for spacecraft early mission support at the NASA Goddard Space Flight Center (GSFC), efforts are being made to automate the attitude sensor calibration process. This paper addresses one of the major components needed by such a system. The beneficiaries of an improved calibration process are missions that demand moderate to high precision attitude knowledge or that need to perform accurate attitude slews. Improved slew accuracy reduces the time needed for re-acquisition of fine-pointing after each attitude maneuver, Rapid target acquisition can be very important for astronomical targeting or for off-nadir surface feature targeting by Earth-oriented spacecraft. The normal sequence of on-orbit calibration starts with alignment calibration of the star trackers and possibly the Sun sensor. Their relative alignment needs to be determined using a sufficiently large data set so their fields of view are adequately sampled. Next, the inertial reference unit (IRU) is calibrated for corrections to its alignment and scale factors. The IRU biases are estimated continuously by the onboard attitude control system, but the IRU alignment and scale factors are usually determined on the ground using a batch-processing method on a data set that includes several slews sufficient to give full observability of all the IRU calibration parameters. Finally, magnetometer biases, alignment, and its coupling to the magnetic torquers are determined in order io improve momentum management and occasionally for use in the attitude determination system. The detailed approach used for automating calibrations will depend on whether the automated system resides on the ground or on the spacecraft with an ultimate goal of autonomous calibration. Current efforts focus on a ground-based system driving subsystems that could run either on the ground or onboard. The distinction is that onboard calibration should process the data sequentially rather than in a single large batch since onboard computer data storage is limited. Very good batch- processing calibration utilities have been developed and used extensively at NASA/GSFC for mission support but no sequential calibration utilities are available. To meet this need, this paper presents the mathematical description of a sequential IRU calibration system. The system has been tested using flight data from the Rossi X-ray Timing Explorer (RXTE) during a series of attitude slews. The paper also discusses the current state of the overall automated system and describes plans for adding sequential alignment calibration and other additions that will reduce the amount of analyst time and input.
Document ID
20040013169
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Sedlak, Joseph
(Computer Sciences Corp. Lanham, MD, United States)
Welter, Gary
(Computer Sciences Corp. Lanham, MD, United States)
Ottenstein, Neil
(Computer Sciences Corp. Lanham, MD, United States)
Date Acquired
August 21, 2013
Publication Date
February 23, 2003
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: 54th International Astronautical Congress
Location: Bremen
Country: Germany
Start Date: September 29, 2003
End Date: October 3, 2003
Sponsors: International Astronautical Congress
Funding Number(s)
CONTRACT_GRANT: GS-35F-4381G
CONTRACT_GRANT: NASA Order S-71002-G
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available