Abstract: A terminal, allowing bidirectional communication with a gateway, receives information from the gateway through a forward satellite and sends information towards the gateway through a return satellite. The terminal comprises an antenna arrangement having a receive aperture for receiving signals from forward satellite and a transmit aperture for transmitting signals to return satellite. A controller computes a pointing direction from receive aperture towards the forward satellite based on the terminal's position and orientation, the antenna arrangement's geometry, and the forward satellite's orbital position; and computes a pointing direction from the transmit aperture towards the return satellite based on the computed pointing direction from the receive aperture towards the forward satellite and the return satellite's orbital position. The invention also relates to a system comprising a terminal and a gateway, and to a method for operating a terminal.

Abstract: A terminal, allowing bidirectional communication with a gateway, receives information from the gateway through a forward satellite and sends information towards the gateway through a return satellite. The terminal comprises an antenna arrangement having a receive aperture for receiving signals from forward satellite and a transmit aperture for transmitting signals to return satellite. A controller computes a pointing direction from receive aperture towards the forward satellite based on the terminal's position and orientation, the antenna arrangement's geometry, and the forward satellite's orbital position; and computes a pointing direction from the transmit aperture towards the return satellite based on the computed pointing direction from the receive aperture towards the forward satellite and the return satellite's orbital position. The invention also relates to a system comprising a terminal and a gateway, and to a method for operating a terminal.

Abstract: The quality of reconstructed images is improved by a post-processing method at the decoder which uses codeword-dependent, spatially-varying 2-dimensional filters. The post-filtering, working across block boundaries, reduces coding artifacts and increases the signal-to-noise ratio. The technique is applicable for use with any VQ-based image compression and can also be used in conjunction with image magnification.