Abstract: The present invention relates to a system for performing radiometric calibration of mosaicking of images. The system includes a calibration reference positioned about an area to be imaged. A sensor is disposed on an aerial vehicle in flight over the area to be imaged. A processor is in communication with the sensor. A plurality of images are obtained by the sensor and are radiometrically calibrated and mosaicked by the processor regardless of whether a calibration reference is visible in an individual image of the plurality of images.

Abstract: A system and method is provided which allows multicast communications encrypted using IPSec protocol to be received by receivers in a network. In order to allow the receivers to receive the encrypted multicast communication, the address information of the received multicast communication is modified to appear as a unicast communication being transmitted directly to the address of the receiver, such that the receiver may then decrypt the received multicast communication using IPSec decryption capabilities or may, alternatively, forward the received multicast communication in its encrypted state to other devices. The system and method further provide IPSec encryption key delivery to the receiver using an encrypted markup language file. Multiple keys may also be generated for a given IP address of a receiver with each key being generated for a particular multicasting hierarchical classification.

Abstract: A method and system for providing high-speed, satellite-based information delivery is described. Improved communication channel efficiency is accomplished by employing an asymmetric data flow. The high bandwidth channel capacity of digital satellite systems is used for the download of large volumes of data. While relatively low speed communication channels are used for upstream data requests. The use of separate channels for upstream data and downloaded data provides an increased efficiency of use for typical Internet and other electronic information service subscribers.