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| Number | Title | Issue Date |
| 7469124 | Rate adaptive satellite communications A system and method for transmitting data from a satellite to a terrestrial receiving station are provided. The system comprises a satellite including a rate adaptive data receiver. The system is configured to establish a data transmission for the satellite to the t... | 12/23/2008 |
| 6961025 | High-gain conformal array antenna An antenna array system comprising a plurality of antenna elements organized in an array and configured to form a non-planar shaped antenna array surface. The antenna array system further comprises switching circuitry configured to switch each of the plurality of an... | 11/01/2005 |
| 6816112 | Hybrid RF/optical acquisition and tracking system and method A hybrid optical and millimeter wave beam acquisition and tracking system and method. A host platform includes an INS and a GPS for generating geolocation data, optical and RF receivers, and a common optical/RF aperture. An interface is coupled to the host platform ... | 11/09/2004 |
| 6810048 | Virtual coherent signal controlled oscillator A virtual coherent signal controlled laser oscillator for use in optical phase locked coherent receivers. The present invention employs a fixed laser oscillator in combination with a signal controlled microwave oscillator. A single sideband mixer processes the signa... | 10/26/2004 |
| 6697996 | Multi-dimensional packet recovery system and method Multi-dimensional packet recovery systems and methods that permit recovery of lost packets and packets containing transmission errors that are transmitted over a network. The packet recovery systems and methods transmit a multi-dimensional array comprisin... | 02/24/2004 |
| 6593827 | Modulating array transmitter autocalibration method and system An autocalibrating modulating array transmitter 10 and autocalibration method 30. The autocalibrating modulating array transmitter is used to gain-balance and phase-balance parallel amplifier stages 11 for coherent combining. The novelty of the autocalibr... | 07/15/2003 |
| 6567477 | Two-dimensional constellation generation, pruning, and partial gray coding for bandwidth and power efficiency An improved constellation pruning and partial Gray coding method for generating constellations that are transmitted by a transmitter. The approximate symbol error rate (SER) for each possible subconstellation is first determined. Then, each of the subcons... | 05/20/2003 |
| 6267329 | Medium earth orbit communications satellite system A Medium Earth Orbit (MEO) satellite constellation comprising two satellite subconstellations. Each of the two satellite subconstellations comprises three cross-linked satellites. The cross-linked satellites of both subconstellations lay within or near th... | 07/31/2001 |
| 6195195 | Opto-mechanical controlled variable RF/microwave delay element and method A delay element and method for delaying an RF/microwave signal. The delay element uses a laser and an RF modulator to modulate a laser beam using an applied RF/microwave input signal. Collimating optics collimate the modulated laser beam and couple the be... | 02/27/2001 |
| 6151481 | Combiner with phase and delay correction A combining technique for coherently combining signals transmitted from a moving satellite that are received by separate antennas. The combining technique corrects for differential delays that are large enough to cause misalignments in the symbols of the ... | 11/21/2000 |
| 6144786 | High bandwidth-time product continuously variable controlled delay system Delay systems that employ switched discrete delay elements and continuously variable controlled delay elements to achieve a continuous (glitchless) delay range. The delay systems incorporate several technologies and subsystems to realize very high bandwid... | 11/07/2000 |
| 6137833 | Programmable transmitter baseband equalizer A transversal filter equalizer comprising a programmable transmitter baseband equalizer for use in high rate digital transmitters. The programmable transmitter baseband equalizer processes digital data using a 1/2-symbol spaced transversal filter to produ... | 10/24/2000 |
| 6002723 | Digital receiver having programmable complex threshold detectors and threshold interpreters A programmable digital baseband receiver that processes a large number of signal waveforms and data rates. Programmable elements of the receiver implement coherent signal detection, automatic gain control and decision processing that permits processing of... | 12/14/1999 |
| 5917384 | Modulating array transmitter and method having improved on-off keying A modulating array transmitter employing a method that provides for improved power efficiency. The present inventors have observed that for symbols where pairs of power amplifiers of the modulating array transmitter are driven with opposing phases, the pa... | 06/29/1999 |
| 5898737 | Adaptive digital symbol recovery for amplitude phased keyed digital communication systems Improvements to amplitude phased keyed digital communications systems and to the processing of amplitude phase keyed symbols transmitted over radio frequency channels. The present invention provides for an amplitude phased keyed digital communications sys... | 04/27/1999 |
| 5890679 | Medium earth orbit communication satellite system A Medium Earth Orbit (MEO) satellite constellation comprising two satellite subconstellations. Each of the two satellite subconstellations comprises three cross-linked satellites. The cross-linked satellites of both subconstellations lay within or near th... | 04/06/1999 |
| 5867071 | High power transmitter employing a high power QAM modulator A high power RF transmitter that uses high power modulators that perform quadrature amplitude modulation (QAM) on a carrier signal after power amplification that is performed in the RF carrier source. The present invention transposes the locations of the ... | 02/02/1999 |
| 5783977 | Tunable and bandwidth programmable multi-element filter system A method and apparatus which realize an RF bandpass filter having a tunable bandwidth and center frequency over a large range of the radio frequency spectrum. The filter is comprised of a cascade of filter elements. Each element is comprised of a signal s... | 07/21/1998 |
| 5666124 | High gain array antenna system A high gain Cassegrain reflector antenna system is disclosed for use in a RF signal receiving application. In one embodiment of the invention the antenna is a single parabolic reflector antenna having a plurality of feeds, while in another embodiment the ... | 09/09/1997 |
| 5612651 | Modulating array QAM transmitter This invention pertains to a method for producing high power microwave transmission signals conveying one of a plurality of symbols, wherein a symbol represents a plurality of bits, and also to a modulating array transmitter that operates in accordance wi... | 03/18/1997 |
| 5543811 | Triangular pyramid phased array antenna A phased array antenna (PAA) that is particularly adapted to accommodate communications with low earth orbiting (LEO) satellites includes three antenna faces which comprise a phased array of radiating elements, each antenna face is triangular and the thre... | 08/06/1996 |
| 5432787 | Packet data transmission system with adaptive data recovery method A packet communication system transmits a stream of L data packets with at least one parity packet transmitted as an L+1th packet. The parity packet comprises at least, N data segments, each ith data segment being the modulo-2 sum of all identi... | 07/11/1995 |
| 5237292 | Quadrature amplitude modulation system with compensation for transmission system characteristics Digital signals are converted to phase and amplitude altered, periodic, analog signals and emplaced on an output link. The system is adaptive and includes a plurality of simple quadrature phase shift keying modulators, each modulator having a plurality of... | 08/17/1993 |
| 4958349 | High data rate BCH decoder A decoder for selected linear error correcting codes, such as a BCH code, uses relatively low-speed circuitry to determine syndromes and corresponding error locations for correcting the code. In a specific embodiment of a BCH linear cyclic invariant error... | 09/18/1990 |
