AIRBORNE MULTIDIMENSIONAL INTEGRATED REMOTE SENSING SYSTEM
Weiming Xu*, Jianyu Wang, Rong Shu, Zhiping He, Yanhua Ma
Shanghai Institute of Technical Physics, CAS, 500 Yutian Road, Shanghai 200083, P. R. of China -
xuwm@mail.sitp.ac.cn
Commission VI, ICWG V/I
KEY WORDS: Imaging spectrometer, Three-line scanner, Laser ranger, Position & orientation subsystem
ABSTRACT:
In this paper, we present a kind of airborne multidimensional integrated remote sensing system that consists of an imaging
spectrometer, a three-line scanner, a laser ranger, a position & orientation subsystem and a stabilizer PAV30. The imaging
spectrometer is composed of two sets of identical push-broom high spectral imager with a field of view of 22°, which provides a field
of view of 42°. The spectral range of the imaging spectrometer is from 450nm to 900nm, and its spectral resolution is 5nm. The
three-line scanner is composed of two pieces of panchromatic CCD and a RGB CCD with 20° stereo angle and 10cm GSD(Ground
Sample Distance) at 1000m flying height. The laser ranger can provide height data of three points every other four scanning lines of
spectral imagers and those three points are calibrated to match the corresponding pixels of the spectral imagers. The post-processing
attitude accuracy of POS/AV 510 used as the position & orientation subsystem, which is the aerial special exterior parameters
measuring product of Canadian Applanix Corporation, is 0.005° combined with base station GPS data. The airborne
multidimensional integrated remote sensing system was implemented successfully, performed the first flying experiment on April,
2005, and obtained satisfying data.
1. INTRODUCTION
Both the spatial and spectral resolutions are very important
specifications for remote sensing systems. The former
determines geometrical resolution power of systems; the latter
determines the power of target recognizing. In the past few
decades, the spatial and spectral resolutions of airborne remote
sensing systems have been improved greatly. The spatial
resolution reached 0.1m at 1000m flying height, and the spectral
resolution up to lnm. However, it is still very difficult to obtain
good images with both high spatial and spectral resolution
simultaneously, which can be registered easily, because of
relative restriction of these two specifications. To fulfill the
requirements, we designed this multidimensional integrated
remote sensing system that can provide high spatial and spectral
data synchronously. This system was supported by high-tech
research and development program of China, which can survey
and produce 1:2000 to 1:5000 thematic map and suitable for the
regions of city layout, resource investigation, environment
inspection, similar applications and so on.
2. SYSTEM DESCRIPTION
2.1 System configuration
The system consisted of multidimensional information
acquisition subsystem, multidimensional information processing
subsystem, performance measurements and systematic
calibration subsystem. The information acquisition subsystem
includes: a three-line scanner with high spatial resolution power,
an imaging spectrometer with high spectral resolution power, a
laser ranger, a stabilized platform and a set of attitude &
position measuring device. The multidimensional information
processing subsystem includes: data preprocessing module, high
spatial data processing module, high spectral data processing
module, and data merge processing module. The performance
measurements and systematic calibration subsystem includes:
comprehensive performance measurement module in the lab,
spectral and radiometric calibration in the lab and field. All the
above are shown in figure 1 and 2.
As shown in figure 2, the system can be used as one set of
device, also can be divided into two parts: high spatial part and
high spectral part, which is flexible for different applications.
When used as a whole, the system can be controlled by a
computer; consequently it needs only one person to operate this
instrument. And a basic external clock was divided into
different frequencies to synchronize all sensors: 600Hz for
three-line scanner, 50Hz for imaging spectrometer, 10Hz for
laser ranger, at the same time all the working frequencies were
copied to POS/AV 510, which could record attitude and position
information at the rising or falling edge of the ingoing pulse
according to the customized settings.
Figure 1. Functional diagram of system
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