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| Number | Title | Issue Date |
| 7250815 | Amplifier distortion management apparatus, systems, and methods An apparatus and a system, as well as a method and an article, may include detecting an indication of an amplifier output signal amplitude and responsively adjusting the amplifier input signal phase to reduce a change in the phase of the output signal. ... | 07/31/2007 |
| 7110719 | Indoor mobile communication device It is an object of the present invention to provide an indoor mobile communication device having a simple structure, providing a sufficient communication range, and also providing for stable communication with a small fading effect. In order to attain this object, t... | 09/19/2006 |
| 7002461 | Passive RFID transponder/machine-mounted antenna and reader system and method for hidden obstacle detection and avoidance A system designed to detect and identify fixed utility objects, such as telephone pedestals, power transformers, man-holes, anchor cables, and the like, that are hidden by heavy overgrowth of vegetation. The system provides for automatic look-ahead detection of such... | 02/21/2006 |
| 6621417 | Passive RFID transponder/reader system and method for hidden obstacle detection and avoidance A system designed to detect and identify fixed utility objects, such as telephone pedestals, power transformers, man-holes, anchor cables, and the like, that are hidden by heavy overgrowth of vegetation. The system provides for automatic look-ahead detect... | 09/16/2003 |
| 5402132 | Monopole/crossed slot single antenna direction finding system A direction finding system utilizing a single monopole/crossed slot antenna in combination with associated electronic circuitry. Each of the four ports of the antenna are connected to amplitude varying elements whose outputs are combined by a power combin... | 03/28/1995 |
| 5323167 | Antenna configuration and system for determining the direction of a radio frequency signal An antenna configuration system for determining the bearing angle of a radio frequency signal includes a plurality of loop antennas and at least one sense antenna. Through the utilization of combining networks with the loop antennas, in-phase and out-of-p... | 06/21/1994 |
| 5198823 | Passive secondary surveillance radar using signals of remote SSR and multiple antennas switched in synchronism with rotation of SSR beam The range from which transponder replies can be received at a virtual secondary surveillance radar of the type described in U.S. Pat. No. 4,115,771 is extended by replacing the omnidirectional antenna previously utilized to receive replies from transponde... | 03/30/1993 |
| 5003316 | Single null miniature direction finder A single null miniature direction finder which may be worn on the arm of the user and is fully automatic in operation. Signals from a single loop antenna and a sense antenna are summed; however, the amplitude of the sense signal is adjusted at first and s... | 03/26/1991 |
| 4667203 | Method and system for determining position using signals from satellites A method and a system are disclosed for measuring the baseline vector b between a pair of survey marks on the ground by radio interferometry using radio signals broadcast from the earth orbiting satellites of the NAVSTAR Global Positioning System (GPS), t... | 05/19/1987 |
| 4654664 | Electronic null-seeking goniometer for ADF Described herein is a system providing an electronic null-seeking goniometer for use in automatic direction finding equipment. A microprocessor is used to generate sine and cosine information in response to the detected phase of the bearing signal. The mi... | 03/31/1987 |
| 4635065 | Antenna device for direction finders An antenna device for a direction finder includes a substantially grounded conductive base plate, a plurality of web-shaped antenna elements mounted in spaced relation on the base plate and having central portions extending in crisscross relation and insu... | 01/06/1987 |
| 4617570 | Interference cancelling receiver having high angular resolution intercept of transmitted radiators A swept interference canceller including a multiplexed interference cancelling receiver coupled to a scanned notch antenna and an omni-directional antenna as well as an estimator type of angular beam splitting system for accurately measuring angular beari... | 10/14/1986 |
| 4358768 | Radio direction finder A radio direction finder for obtaining the bearing of a transmitter with respect to a receiver comprises a multi-element receiving antenna, two separate scanning means coupled to said antenna for simultaneously generating a rightward and a leftward rotati... | 11/09/1982 |
| 4197542 | Radio navigation system An electronic navigation system ground station, which may be either an omni-range beacon (such as VOR) or a passive direction finder. A circular array of antenna elements has a feed arrangement which includes switched programming of at least one discrete ... | 04/08/1980 |
| 3987446 | Direction finding apparatus The present invention refers to a system intended to locate the direction of a source of electromagnetic radiation and is particularly applicable to radar detection receivers such as those employed in aircraft. This system is capable of performing the dir... | 10/19/1976 |
| 3943516 | Strobe generator 4. A strobe generator for a radar set which includes a rotatable directio antenna, a plan position indicator and has an interpulse period defined by the time between transmitted pulses, comprising; means to sweep said rotatable directional antenna past a... | 03/09/1976 |
