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| Number | Title | Issue Date |
| 7342538 | Asynchronous local position determination system and method In a local positioning system, the land-based transmitters include free running oscillators or oscillators free of clock synchronization with any remote oscillator. A reference receiver receives the ranging signals from different transmitters and generates timing of... | 03/11/2008 |
| 7339525 | Land-based local ranging signal methods and systems To provide sub-meter accuracy in a local positioning system, ranging signals with a high modulation rate of code, such as 30 MHz, or more are transmitted. Code phase measurements may be used to obtain the accuracy without requiring relative motion or real time kinem... | 03/04/2008 |
| 7339524 | Analog decorrelation of ranging signals In a local positioning system, a receiver is adapted for receiving signals from a land-based transmitter. The receiver includes an analog decorrelator for decorrelating the transmitted spread spectrum signals. A down converter connected with an antenna may be spaced... | 03/04/2008 |
| 7339526 | Synchronizing ranging signals in an asynchronous ranging or position system In a local positioning system, the land-based transmitters include free running oscillators or oscillators free of clock synchronization with any remote oscillator. A reference receiver receives the ranging signals from different transmitters and generates timing of... | 03/04/2008 |
| 7280072 | System for the relative navigation of aircraft and spacecraft using a phased array antenna A system for the relative navigation of aircraft and spacecraft is disclosed which uses a series of short duration, unmodulated radio pulses transmitted from a phased array antenna. The aircraft or spacecraft whose position is to be determined from another is called... | 10/09/2007 |
| 7276990 | Single-pole multi-throw switch having low parasitic reactance, and an antenna incorporating the same A switch arrangement comprises a plurality of MEMS switches arranged on a substrate about, and close to, a central point, each MEMS switch being disposed on a common imaginary circle centered on the central point. Additionally, and each MEMS switch is preferably spa... | 10/02/2007 |
| 7271766 | Satellite and local system position determination In a local positioning system, augmentation of the land-based system is provided by receiving signals from a GNSS. The signals from the land-based positioning system have a code phase accuracy better than one wavelength of a carrier of the signals from the GNSS. Dif... | 09/18/2007 |
| 7230980 | Method and apparatus for impulse radio transceiver calibration A method for calibrating an impulse radio distance measuring system comprising an impulse radio transceiver by conducting a pulse through a transmit receive switch to an antenna, receiving return energy which has been discharged across the transmit receive switch, d... | 06/12/2007 |
| 7215296 | Switched multi-beam antenna An antenna assembly includes a common reflector and multiple monopole type antenna elements positioned on a ground plane and fed with a switch assembly. The switch assembly is capable of feeding individual antennas as well as combining multiple antennas for improved... | 05/08/2007 |
| 7209071 | System and method for distance measurement A system and method for performing distance measurement using wireless signals. A time of flight calculation is enabled by an interrogating device that transmits an interrogation signal to a responding device, which returns a synchronized signal back to the interrog... | 04/24/2007 |
| 7193561 | Phase controlled antennae for data transmission between mobile devices In a phase-controlled antenna array for mobile devices, in particular designed for flying device, groups of controllable passive antenna elements are arranged in concentric circles around an active central antenna element. The arrangement of additional similar plana... | 03/20/2007 |
| 7176844 | Aperiodic array antenna An antenna array that uses at least two passive antennas and one active antenna disposed above a ground plane, but electrically isolated from the ground plane, and a respective resonant strip positioned beneath each passive antenna. The passive antenna elements are ... | 02/13/2007 |
| 7133810 | Designs for wide band antennas with parasitic elements and a method to optimize their design using a genetic algorithm and fast integral equation technique A method for applying an algorithm to facilitate the design of wideband omnidirectional antennas, and the design of sleeve cage monopole and sleeve helix units includes rapid resolution of a complex relationship among antenna components to yield an optimal system. A... | 11/07/2006 |
| 7123659 | Digital reception apparatus for removing distortion from received signals A digital reception apparatus includes a receiver that processes a received signal and a distortion corrector that corrects a non-linear distortion of the processed received signal, introduced by the receiver. The receiver may include an amplifier, a quadrature demo... | 10/17/2006 |
| 7116278 | Compact low RCS ultra-wide bandwidth conical monopole antenna A low radar cross-section monocone antenna is provided with an ultra-wide bandwidth in the microwave region of the electromagnetic spectrum running from 1 gigahertz to 18 gigahertz by decreasing the low frequency cutoff through enlarging the overall dimensions of th... | 10/03/2006 |
| 7079081 | Slotted cylinder antenna An antenna (100) for RF communications. The antenna includes a radiating member (102) which is substantially tubular so as to define a cavity (104) therein. The radiating member (102) is made of a conductive material having a non-conducti... | 07/18/2006 |
| 7034656 | Method for identifying the position of a portable transponder, and an antitheft system A method for the recognition of the proximity of a portable transponder (20) to a base station (2), comprises the steps of: the base station transmits a first test signal with a defined power, the transponder determines the field strength with which it... | 04/25/2006 |
| 7009559 | Method and apparatus for adapting antenna array using received predetermined signal A mobile subscriber unit includes a smart antenna having antenna elements for generating a plurality of antenna beams, and adjustable weight control components connected to the antenna elements for selecting any one of the antenna beam. A transceiver is connected to... | 03/07/2006 |
| 7006047 | Compact low RCS ultra-wide bandwidth conical monopole antenna A low radar cross-section monocone antenna is provided with an ultra-wide bandwidth in the microwave region of the electromagnetic spectrum running from 1 gigahertz to 18 gigahertz by decreasing the low frequency cutoff through enlarging the overall dimensions of th... | 02/28/2006 |
| 5157408 | Low probability of interception relative position determination system A radio system for determining the range and bearing of mobile equipment, such as an aircraft, relative to reference equipment such as an aircraft carrier, with low probability of interception (LPI). The aircraft remains equipped with high power range and... | 10/20/1992 |
| 5128873 | Aircraft rendezvous using low data rate two-way TACAN bearing information Aircraft rendezvous is facilitated by operating airborne remote aircraft TACAN stations in the inverse bearing mode and using low data rate range interrogation and range reply signals for determining bearing. An aircraft determines its bearing to another ... | 07/07/1992 |
| 4905012 | Power efficient feed network for TACAN antenna arrays An antenna feed for a TACAN circular array. A power divider divides a source of radio frequency signals into zero, first and ninth order mode signals. A second power divider divides the zero mode input signal into a plurality of output signals each drivin... | 02/27/1990 |
| 4730192 | Monitor for an electronic TACAN beacon A monitor for an electronic TACAN (ELTA) includes a 16-way switch whereby samples of the r.f. signal fed to each TACAN antenna element are fed via a common lead 30 to (a) means for r.f. phase correlating the samples with the transmitter generated signals,... | 03/08/1988 |
| 4698637 | Device for pulse modulation automatic control A device for pulse modulation automatic control, where the modulation is a combined plurality of pulse components. Each pulse component is singly controlled by a respective control voltage or current, the control voltages and/or currents being fully indep... | 10/06/1987 |
| 4682181 | Flush mounted tacan base station antenna apparatus A flush-mounted radiating antenna is disclosed which can be electronically switched to produce a rotating directional field with no moving parts in the antenna element itself or with the appropriate electronics in the entire mechanism. This is accomplishe... | 07/21/1987 |
| 4646097 | Off-channel frequency discriminator circuit for use in a precision distance measuring equipment (DME/P) receiver A precision distance measuring equipment (DME/P) receiver for detecting an RF signal including at least one interrogation pulse is described. The DME/P receiver includes first and second signal processing channels. The first processing channel includes a ... | 02/24/1987 |
| 4641142 | TACAN beacon A TACAN beacon is disclosed in which the pulse-modulated carrier signal generated in a transmitter is applied to the elements of a circular antenna array through controllable phase shifters that generate 15-Hz and 135-Hz sidebands through, switches, and t... | 02/03/1987 |
| 4636958 | Arrangement for receiving TACAN signals A receiver for pulse amplitude modulated TACAN signals having 15 Hz and 135 Hz modulating components and which determines the TACAN bearing angle by calculating the phase shift angles $c;15 and $c;135 of those components of the received signals. The... | 01/13/1987 |
| 4631546 | Electronically rotated antenna apparatus An antenna of the type having a central driven element and a plurality of surrounding parasitic elements is shown. Further, there is circuitry for modifying the basic omnidirectional pattern of said antenna to a directional pattern by normally capacitivel... | 12/23/1986 |
| 4446464 | Airborne tacan equipment utilizing a logarithmic amplifier Airborne Tacan equipment includes a receiver to receive Tacan signals and to provide an output signal having modulation components containing bearing information. The receiver includes a logarithmic amplifier to preserve the amplitude modulation of the mo... | 05/01/1984 |
| 4409594 | Apparatus for performing radio frequency pulse modulation with automatic modulation control A modulator for RF class C amplifiers particularly suitable for transistor power stages employing FAIL-SOFT. Automatic modulation control operates to independently adjust the gains of a pair of controllable amplifiers whose outputs are then combined, filt... | 10/11/1983 |
| 4385300 | Digital TACAN processor A stand-alone digital processor based system includes a five-output state digital filter provided with magnitude and time data relative to a received TACAN signal. Threshold detection is provided for validating the received signal magnitude. The filter ou... | 05/24/1983 |
| 4207570 | Device for simulating bearing signals of the tacan type The invention relates to a device for simulating bearing signals of the TACAN type, formed by a modulation signal carried by a high frequency signal and resulting from the superposition of two sinusoidal signals of different low frequencies, as well as by... | 06/10/1980 |
| 4143376 | Method for sampling Tacan signal envelope This invention relates to a method for supplying samples of the received signal envelope in airborne Tacan equipment to the airborne bearing circuitry. During the DME search phase, the airborne DME equipment searches for only those replies which have been... | 03/06/1979 |
| 4074268 | Electronically scanned antenna There is disclosed herein an antenna for generating a rotating pattern. The pattern is generated electronically, and no physically moving parts are required. An exemplary embodiment of the antenna radiates a cardioid pattern which rotates at a 15Hz rate f... | 02/14/1978 |
| 4069412 | Area navigation system There is disclosed an area navigation system including signal averaging and lag compensation circuits to overcome VOR signal propagation instabilities and a meter sensitivity control circuit which decreases the sensitivity of a track angle deviation left-... | 01/17/1978 |
| 4061297 | Approach range monitor An area navigation system capable of operating during an ILS approach to provide the pilot range and bearing with respect to the outer and middle markers for a front course approach, and with respect to the final approach fix and the end of the runway for... | 12/06/1977 |
| 4047176 | Method for the comparative vector measurement of signal pulses arriving nearly simultaneously at several radio receiving stations A method for the comparative vector measurement of keyed radio signal pulses, in particular Tacan pulses, arriving nearly simultaneously at several receiving stations and which can exhibit great level differences, in which, at each receiver, the pulses ar... | 09/06/1977 |
| 4041486 | Pulse stream identification circuit An aircraft DME is receptive of a series of pulses the nature of which alternates between a series of random time spaced pulses and a series of uniform time spaced pulses, where the latter serve to identify the source of the pulses. A set-reset type of co... | 08/09/1977 |
| 4032756 | Tacan-dme identity detector This relates to a method and apparatus for extracting identity information from a Tacan signal which occurs during a 5 second interval every 37.5 seconds. The identity information consists of marks and spaces wherein a mark comprises a predetermined numbe... | 06/28/1977 |
