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1448,
EXTRACTION OF PRECISE ATTITUDE BY MEANS OF IMAGE NAVIGATION CHANNEL DATA OF AVNIR
Kazuyoshi Takahashi and Makoto Ono
Remote Sensing Technology Center of Japan
1-9-9 Roppongi, Minato-ku, Tokyo, Japan
Commision I, Working Group 2
KEY WORDS: Photogrammetry, Technology, Development, Instruments, Electrooptical
ABSTRACT
A method for precise geometrical correction of space borne imager is proposed. In the AVNIR (Advanced Visible and Near Infrared
Radiometer) to be launched on Japanese earth observation satellite ADEOS has an additional CCD array channel (called as image
navigation channel) to be used for this precise geometric correction. Through self closed attitude estimation by using both image data
out of the main CCD channels and stripes out of the image navigation channel, precise relative attitude which is enough to correct
geometrical distortion due to the satellite or sensor attitude motion can be generated. This paper introduces the principle of operation as
well as the simulated result to show the performance of the process.
INTRODUCTION
Till recently, most space borne Earth observing imager data was
processed to eliminate geometrical distortion due to the satellite
motion using attitude telemetry provided from the satellite bus
system. For higher resolution imagers, time intervals of attitude
data are insufficient for extracting enough information to correct
attitude errors, especially to eliminate vibration effects with high
frequency components of attitude change.
In some satellites, additional attitude extraction tools like star
trackers are installed to overcome such problems. This introduces
another bulky instrument into the restricted satellite volume.
Furthermore it doesn't always provide accurate attitude data
0.54 degrees
Main channel Image navigation channel
Image navigation
of AVNIR channel
Main channel
because the local vibration of the satellite is not always the same
as that of the high resolution imagers. Multimission satellites like
ADEOS carry many sensor, some of which have mechanically
moving components which could cause vibration of in the IFOV
of the high resolution imagers.
In this paper, we propose an idea for attitude change extraction
through the high resolution imager itself. We present the basic
idea and principle of operation as well as the simulated result of
attitude change extraction. The system is installed in AVNIR, an
instrument carried aboard ADEOS which will be launched in
August of this year.
ADEOS
The ADEOS satellite acquires global observation data
corresponding to environmental changes, such as global warming,
destruction of the ozone layer, decrease of tropical rain forests,
and occurrence of climatic anomalies. This information is used
for international monitoring of the global environment and to
develop platform bus and inter-orbit data relay technologies
necessary for next-generation Earth observation systems. The
satellite will be equipped with core sensors, AVNIR and an Ocean
Color and Temperature Scanner (OCTS) developed by the National
Space Development Agency of Japan (NASDA), and six sensors
from the US, France, MITI and the Environment Agency. The
satellite will be launched by an H- Il launch vehicle in early 1996
from Tanegashima Space Center. Figure 1 shows the AVNIR
channel and Image navigation channel geometry. Table 1 shows
AVNIR capabilities.
Figure 1 The main and image navigation channels of AVNIR geometry.
187
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996
