Viasat, Inc.

David D Greenidge

Kevin Duane House

Michael T Kretsch

Craig A Miller

David C Wittwer

Mark D Vossler

Kenneth V Buer

Steve Chacko

A multi-static synthetic aperture radar using beamformed illumination beams and multiple collection satellites is described. An illumination satellite may be in first orbit and multiple collection satellites may be in a second orbit. The illumination satellite may transmit beam signals (e.g., communication signals carrying modulated data to user terminals) from an antenna array to different beam coverage areas according to a beamforming matrix. Each of the collection satellites may receive reflections of the beam signals. The reflected signals received at the collection satellites may be processed according to the beam signals and beamforming matrix used to transmit the beam signals to obtain an image of a geographical area. In some cases, the collection satellites may relay the received signals for processing via the illumination satellite.

Multi-static synthetic aperture radar using low earth orbit collection

Systems and method for supporting a fractionated satellite constellation are disclosed. A gateway satellite may route communications to and from auxiliary satellites using a first communication protocol. The auxiliary satellites may be orbitally-coupled with the gateway satellite and may be equipped with respective payload types that provide respective functionalities. The auxiliary satellites may also use respective communications protocols that are different than one another and the first communication protocol. Routing communications to and from auxiliary satellites may include relaying a communication between multiple auxiliary satellites. Routing communications between auxiliary satellites may include relaying a communication between multiple gateway satellites. Routing communications to and from auxiliary satellites may also include relaying communications between commercial satellites and auxiliary satellites.

Fractionated satellite constellation

A system supporting remote sensing of information may include a processing capability configured for determining differences between the sensed information and a baseline condition, such as a base map of information. The determined differences from the baseline condition may be communicated over communication link (e.g., a wireless communication link, a satellite communication link), which may be referred to as or be otherwise associated with a 'delta coding' of information sensed by the remote sensor system. In some examples, delta coding may support a smaller transfer of information over a communication link than communicating an entirety of sensed information. By communicating such difference information, the remote sensor system may accordingly support updating information more efficiently, more frequently, more rapidly, or more reliably, among other benefits.

Delta coding for remote sensing

An AMC antenna apparatus includes a ground plane and a flexible antenna element layer above the ground plane. The ground plane includes a conductive base surface, a plurality of flexible conductors, and a frequency selective surface (FSS) layer above the base surface, where the FSS layer includes a plurality of conductive patches separated from one another. Each of the flexible conductors electrically connects one of the conductive patches to the base surface. A latch mechanism is arranged between the base layer and the FSS layer. An inflatable bladder system between the base layer and the FSS layer is configured to receive a gas input during deployment of the antenna apparatus and inflate to produce force sufficient to cause the latch mechanism to transition from an unlatched state to a latched state in which the conductive base surface is fixedly separated from the FSS layer at a predetermined distance.

Deployable antenna apparatus with inflate to latch mechanism

An artificial magnetic conductor (AMC) antenna apparatus includes a ground plane and a flexible antenna element layer above the ground plane. The ground plane includes a conductive base surface, a plurality of memory metal wires, and a frequency selective surface (FSS) layer above the base surface, where the FSS layer includes a plurality of conductive patches separated from one another. Each of the memory metal wires electrically connects one of the conductive patches to the base surface. Each of the memory metal wires is rigid in a memory-shaped state, causing the FSS layer to be fixedly spaced from the base surface during operation of the AMC antenna apparatus. The memory metal wires are each flexible in a non-memory-shaped state, enabling the FSS layer to be collapsed towards the base surface when the antenna apparatus is stowed.

Antenna apparatus and deployment method employing collapsible memory metal

Systems and method for supporting a fractionated satellite constellation are disclosed. A gateway satellite may route communications to and from auxiliary satellites using a first communication protocol. The auxiliary satellites may be orbitally-coupled with the gateway satellite and may be equipped with respective payload types that provide respective functionalities. The auxiliary satellites may also use respective communications protocols that are different than one another and the first communication protocol. Routing communications to and from auxiliary satellites may include relaying a communication between multiple auxiliary satellites. Routing communications between auxiliary satellites may include relaying a communication between multiple gateway satellites. Routing communications to and from auxiliary satellites may also include relaying communications between commercial satellites and auxillary satellites.

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Longmont, CO, United States of America

David D Greenidge