In this paper, we discuss various techniques being employed to obtain high resolution data with reasonable SNR. Generally, high resolution cameras are combined with high speed electronics to handle high data rates which need more power.

Improved attitude sensors and high capacity actuators are essential to meet these stringent requirements. As the spatial resolution improves, the spacecraft pointing accuracy and drift rate requirements become stringent. The data transmission system needs to be sufficiently capable to transmit the high volume imaging data to the ground station. The capacity of the data storage system has to be increased to cater the high data volume storage requirement. The data handling system has to be designed to handle high data rate and data volume. The performance of satellite bus subsystems like structure, the data handling, and storage system, the data transmission system, attitude sensors and actuators should also be improved to achieve good quality data. Alternate methods such as Step and Stare, and time delay integration methods can be used to achieve high signal to noise ratio images. The mass and size of camera increase with the improvement in spatial resolution. Significant complexity lies in the realization of high spatial resolution camera starting from material selection, high stiffness-low mass opto-mechanical system design, detector selection to high speed camera electronics design.

The realization of high resolution satellite is a challenging task. This data is provided by many satellites and being used in numerous applications.

: High spatial resolution satellite data is essential to identify small objects and extract minute details of the terrain.

Big aperture camera