Payload Configurations for Efficient Image Acquisition – Indian Perspective
Other literature type
Samudraiah, D. R. M.
Kiran Kumar, A. S.
(issn: 2194-9034, eissn: 2194-9034)
The world is increasingly depending on remotely sensed data. The data is regularly used for monitoring the earth resources and also
for solving problems of the world like disasters, climate degradation, etc. Remotely sensed data has changed our perspective of
understanding of other planets. With innovative approaches in data utilization, the demands of remote sensing data are ever
increasing. More and more research and developments are taken up for data utilization. The satellite resources are scarce and each
launch costs heavily. Each launch is also associated with large effort for developing the hardware prior to launch. It is also associated
with large number of software elements and mathematical algorithms post-launch. The proliferation of low-earth and geostationary
satellites has led to increased scarcity in the available orbital slots for the newer satellites. Indian Space Research Organization has
always tried to maximize the utility of satellites. Multiple sensors are flown on each satellite. In each of the satellites, sensors are
designed to cater to various spectral bands/frequencies, spatial and temporal resolutions. Bhaskara-1, the first experimental satellite
started with 2 bands in electro-optical spectrum and 3 bands in microwave spectrum. The recent Resourcesat-2 incorporates very
efficient image acquisition approach with multi-resolution (3 types of spatial resolution) multi-band (4 spectral bands) electro-optical
sensors (LISS-4, LISS-3* and AWiFS). The system has been designed to provide data globally with various data reception stations
and onboard data storage capabilities. Oceansat-2 satellite has unique sensor combination with 8 band electro-optical high sensitive
ocean colour monitor (catering to ocean and land) along with Ku band scatterometer to acquire information on ocean winds. INSAT-
3D launched recently provides high resolution 6 band image data in visible, short-wave, mid-wave and long-wave infrared spectrum.
It also has 19 band sounder for providing vertical profile of water vapour, temperature, etc. The same system has data relay
transponders for acquiring data from weather stations. The payload configurations have gone through significant changes over the
years to increase data rate per kilogram of payload. Future Indian remote sensing systems are planned with very high efficient ways
of image acquisition.
This paper analyses the strides taken by ISRO (Indian Space research Organisation) in achieving high efficiency in remote sensing
image data acquisition. Parameters related to efficiency of image data acquisition are defined and a methodology is worked out to
compute the same. Some of the Indian payloads are analysed with respect to some of the system/ subsystem parameters that decide
the configuration of payload. Based on the analysis, possible configuration approaches that can provide high efficiency are
identified. A case study is carried out with improved configuration and the results of efficiency improvements are reported. This
methodology may be used for assessing other electro-optical payloads or missions and can be extended to other types of payloads