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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 5878034 | Spacecraft TDMA communications system with synchronization by spread spectrum overlay channel In a time division multiple access spacecraft communication system, each ground station determines when to send its information packets to arrive at the spacecraft at the beginning of a time slot. The calculation is based upon knowledge of the locations o... | 03/02/1999 |
| 5867489 | Method and apparatus for TDMA slot synchronization with precision ranging In a time division multiple access spacecraft communication system, each ground station determines when to send its information packets to arrive at the spacecraft at the beginning of a time slot. The calculation is based upon knowledge of the location of... | 02/02/1999 |
| 5828335 | Spacecraft communication channel power control system A control system for the uplink transmitter of a ground station communicating with a spacecraft includes an antenna located at the ground station, pointed toward the spacecraft for receiving downlink signals transmitted therefrom. The received signals are... | 10/27/1998 |
| 5717686 | Cellular spacecraft TDMA communications system with call interrupt coding system for maximizing traffic throughput Improved throughput is provided in a spacecraft TDMA cellular communications system by in-call signalling without the need for flag bits, while still allowing the in-call signaling to be differentiated from other traffic. The terrestrial locations include... | 02/10/1998 |
| 5708966 | Method and apparatus for performing power control using the wide-band synchronization A communications system includes first and second ground stations and a spacecraft repeater. Data signals are transmitted between ground stations by way of the repeater, together with spread-spectrum ranging signals. Uplink rain attenuation is compensated... | 01/13/1998 |
| 5680143 | Method and apparatus for a low complexity satellite ranging system using Gaussian noise overlay A ranging system for a communications spacecraft (14) overlays a Gaussian noise signal over a broadband channel which also carries information or traffic signals. The noise is used to establish the range between a ground station (12) and the spacecraft (1... | 10/21/1997 |
| 5668450 | Half-wave, brushless, four-phase DC motor with bifilar windings A half-wave brushless, four-phase DC motor includes sets of four stator windings fed at 90° phase increments by four switches. The 0° and 180° windings are wound about their magnetic stator poles in bifilar conductor pairs, and the 90° and 270° ... | 09/16/1997 |
| 5633995 | Camera system and methods for extracting 3D model of viewed object A system for extracting a three-dimensional model of an object viewed in a selected scene, includes at least one camera for acquiring scene information, each from a different spatial-temporal aspect of the total scene. A digitizer converts the scene video... | 05/27/1997 |
| 5566150 | Multibeam optical apparatus and method for tracking control for an optical disk having a set of tracks A multitrack optical disk has two or more circular or spiral tracks, which are recorded or played back in simultaneous sets for high data rates. Tracking is accomplished by sets of first and second tracking pads, which lie partially on and partially off t... | 10/15/1996 |
| 5546421 | Self compensating spread-spectrum hybrid A communications station (10) couples a bidirectional input-output signal path (16') to two unidirectional signal paths; a transmit signal path (12') and a receive signal path (14'), using a controllable hybrid (20). A feedback control system in the stati... | 08/13/1996 |
| 5432819 | DPSK communications with Doppler compensation A data receiver receives differential phase-shift keyed (DPSK) signals, and filters the signal by a process including frequency conversion, under the control of an estimated carrier frequency (fre), to produce a filtered output signal which is ... | 07/11/1995 |
| 5425058 | MSK phase acquisition and tracking method An MSK receiver includes a downconverter for downconverting the received MSK signals. The phase drift or phase error per bit of the message preamble is determined. The reference carriers are generated, and the phase of the reference signals is adjusted du... | 06/13/1995 |
| 5309520 | Signal processing system using recursive radon video transform processor A recursive Radon video transform processor, for detecting signal responses from objects to be recognized, generates a special manifold of the response data for Radon transformation of the stored data before operation thereon by a subsequent enhancement p... | 05/03/1994 |
