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| Number | Title | Issue Date |
| 7302267 | Apparatus and method for estimating a velocity of a mobile terminal in a mobile communication system A Base Station (BS) apparatus for estimating a velocity of a Mobile Station (MS) in a mobile communication system includes a channel estimator for performing channel estimation according to a velocity band, receiving a wireless channel signal from the MS, and perfor... | 11/27/2007 |
| 7054739 | Radio navigation system Navigation apparatus that may include a radio receiver, at least one directional antenna communicatively coupled to the radio receiver, and a navigation computer including a memory and a processor. The navigation computer may be communicatively coupled to the radio ... | 05/30/2006 |
| 6151353 | Pre-acquisition frequency offset removal in a GPS receiver A direct sequence spread spectrum receiver samples an incoming signal and stores the sample in memory. Prior to sampling and storage, the incoming signal is translated to an IF signal. Also prior to storage, the IF signal is corrected for a frequency offs... | 11/21/2000 |
| 5878330 | Satellite communications system including automatic frequency control An automatic frequency control system for use in satellite communications is provided that is pre-programmed with an initial acquisition Doppler offset frequency. The system includes a search mode for accurately determining the satellite's initial frequen... | 03/02/1999 |
| 5757677 | Compensation for differences in receiver signals and in satellite signals Method and apparatus for compensating for the differences in time varying signals S(t;R;S) received and processed by two signal receivers (R2 and R3), located at the same site, from two signal sources (S2 and S3... | 05/26/1998 |
| 5526291 | Compensation for receiver and satellite signal differences A method for compensating for the differences in time varying signals S(t;R;S) received and processed by two signal receiver/processors (R2 and R3), located at the same site, from two signal sources (S2 and S3) ... | 06/11/1996 |
| 5465274 | Digital circuit for decoding encoded doppler data An electronics circuit receives a sub frame of encoded doppler data having roups One through N of data words with the first three words of Group N comprising a frame sync signal which is compared to a reference signal with a sync pulse being generated when... | 11/07/1995 |
| 4485384 | Microwave system The new invention is a description of a double sideband commutated Doppler microwave system for landing aircraft or spacecraft. It is capable of providing angular information in elevation and azimuth by the measurement of a Doppler frequency in an airborn... | 11/27/1984 |
| 4417250 | Monitoring device for a radio navigation system of the doppler VOR type A device for monitoring a Doppler VOR system emitting sinusoidal signals at a frequency of 30 Hz, one called "reference" and the other called "variable" whose phase varies with respect to that of the first signal, comprises at least one sensor close to th... | 11/22/1983 |
| 4148034 | Radio direction finding system A radio direction finding system including a transmitter and associated antenna located at one end of a radio communication path and a receiver and associated antenna at the other end. One of the antennas is characterized by an omni-directional pattern. T... | 04/03/1979 |
| 4017862 | Aircraft guidance system A ground installation for an aircraft landing system has an array of transmitting elements located on the arc of a circle. When the elements are activated sequentially either in one direction ("to") or the other ("fro"), a signal is transmitted which, whe... | 04/12/1977 |
| 3988733 | VOR receiver with improved performance in a Doppler navigation system VOR receiver which operates in known manner when receiving from normal VOR ground stations, SSB-DVOR and DSB-DVOR ground stations, and with substantially improved accuracy when receiving ASB-DVOR ground stations. When the receiver receives ASB signals, on... | 10/26/1976 |
| 3977002 | Tracking filter for frequency measurement in a Doppler type navigation guidance system or the like A Doppler type radio navigation system in which each element of a linear array is energized discretely and sequentially to produce a simulated Doppler effect at a remote location such as an aircraft on landing approach. A reference signal is also transmit... | 08/24/1976 |
| 3958244 | Transmitter output monitor A monitor for detecting faults in the output signals of a transmitter in which a selected modulation component of the signal is used to activate fault-detecting means. In the case of a DVOR beacon system, the sub-carrier frequency is filtered from the det... | 05/18/1976 |
| 3946386 | Navigation receiver with doppler filter gating A navigation guidance receiving system for use with a Doppler navigation beacon of the type comprising a commutated linear array for producing a simulated Doppler effect. The receiving system includes a wideband Doppler beat waveform information filter an... | 03/23/1976 |
| 3943518 | Doppler ILS receiver with beat signal scan synchronization Radio navigation receiver apparatus for operation with ground beacon equipment of the simulated Doppler type (having a commutated array). The receiver derives a beat between the received ground beacon (commutated) signals and a reference signal also from the g... | 03/09/1976 |
