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| Number | Title | Issue Date |
| 6275164 | Emergency locator system A low-cost emergency locator beacon (ELB) device that transmits an identifying serial number in addition to the beacon signal. This transmission includes an audio modulated Manchester encoded digital version of the serial number, and an analog, voice synt... | 08/14/2001 |
| 6198436 | Integrated interferometer and instantaneous frequency measurement device and method An integrated receiver includes an Instantaneous Frequency Measurement (IFM) device, an interferometer and switches. The IFM receives signals from a target and determines the frequency of the signals. The IFM includes the shared N-channel phase receiver. ... | 03/06/2001 |
| 6115654 | Universal sensor interface system and method A universal sensor interface system that utilizes a common hardware and software interface to drive many types of sensors. A variety of stimulation signals are generated that are transmitted to a plurality of sensors. The stimulation signals cause the sen... | 09/05/2000 |
| 6040801 | Low duty cycle navigation system This invention relates to radio navigation systems and is particularly dited to means for transmitting range and azimuthal information to selected receivers only. More specifically this invention relates to a R-O navigating system in which the signal is ... | 03/21/2000 |
| 6034622 | Location monitoring via implanted radio transmitter An open-loop internal monitoring system comprising (a) a plurality of internal radio transmitters, each being implanted in a human for transmitting a plurality of signal pulses, each pulse being encoded with unique identifying information; (b) a plurality... | 03/07/2000 |
| 5900828 | Modemless transmitter for test vehicle tracking system A system for recording vehicle data from vehicles traversing a test track includes a plurality of locator beacons buried in respective well casings around the test track for transmitting location signals. Each beacon includes a transmitter and a microproc... | 05/04/1999 |
| 5815113 | Monolithic, low-noise, synchronous direct detection receiver for passive microwave/millimeter-wave radiometric imaging systems A direct detection receiver for a passive microwave and millimeter wave radiometric imaging system. The receiver includes a balanced switch low-noise amplifier (BSLNA). A front-end, low-noise amplifier (LNA) is inserted before the BSLNA to achieve a low-n... | 09/29/1998 |
| 5682313 | Method for localization of beacons for an autonomous device The present invention provides an improved method for determining a coarse direction in an orientation system of a an autonomous device (10), for instance a dust cleaning robot together with a system of active beacons or transponders. A transmitter (20) f... | 10/28/1997 |
| 5652592 | Radio location with enhanced Z-axis determination An enhanced system for calculating the Z-Axis, or relative height or altitude, of a radio beacon. The present invention uses a barometric pressure sensing device co-located with the radio emitter to transmit data representing relative altitude. To further... | 07/29/1997 |
| 5581261 | Communication configurator and method for implementing same A method and apparatus for communication configuring in digital equipment based on the location of the equipment includes a mechanism determining the location of the digital equipment and a mechanism configuring a communication channel of the equipment ba... | 12/03/1996 |
| 5563612 | Frequency multiplier circuitry for radio beacons A portable emergency position indicating radio beacon (EPIRB) that transmits two signals at different frequencies whereby one frequency is twice the frequency of the other and wherein the beacon incorporates a push-push frequency multiplier to multiply th... | 10/08/1996 |
| 5515061 | System for broadcasting marker beacon signals and processing responses from seeking entities A target electronic system forms part of a marker beacon. The target system ids in detecting the marker beacon upon deployment. A seeking electronic system for locating the target system may be mounted on an air vehicle, land vehicle, sea vehicle, or backp... | 05/07/1996 |
| 5446466 | Radio beacon phase modulator A phase modulator for a position indicating radio beacon which includes a digital memory circuit having a plurality of sets of stored numerical amplitude values with each set corresponding to a sine wave of a given phase and with at least three values in ... | 08/29/1995 |
| 5365451 | Mobile unit tracking system A communication network keeps track of the locations of mobile units which utilize the network. On powering up, the mobile units determine their current locations using signals broadcast, for example, by overhead satellites. They then send data communicat... | 11/15/1994 |
| 5226061 | Transmitters and transmitter circuits The invention relates to small low voltage transmitters for transmitting at a single frequency, preferably in the VHF range, suitable for use in the location or tracking of birds, animals, vehicles, people or other objects where the transmitter is require... | 07/06/1993 |
| 5218366 | Emergency transmitter buoy for use on marine vessels An emergency position indicating radio beacon ("EPIRB") includes a watertight housing with an ON-OFF switch on the outside of the housing which does not require holes through the housing wall. A floatation collar on the housing maintains the EPIRB in an u... | 06/08/1993 |
| 4888595 | Acquisition signal transmitter An encoded information transmitter which transmits a radio frequency carrier that is amplitude modulated by a constant frequency waveform and thereafter amplitude modulated by a predetermined encoded waveform, the constant frequency waveform modulated car... | 12/19/1989 |
| 4673936 | Rescue transmitter apparatus A small-size transmitting apparatus for search and rescue operation (SARTR) adapted to be worn by a user for emitting a microwave rescue signal upon a marine accident involving the user. The SARTR includes a power supply, a transmitter unit energizable by... | 06/16/1987 |
| 4241310 | Delay line digital code detector Digital codes, each of which is comprised of a series of equally spaced pulse positions bracketed by framing pulses are passed through a delay line having a plurality of taps. The taps are connected in a gating structure which extracts only valid codes an... | 12/23/1980 |
