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| Number | Title | Issue Date |
| 7411535 | D/A conversion circuit and semiconductor device A D/A conversion circuit in accordance with the present invention, which is provided with a switch swD, allows a writing operation of a voltage (a true gradation voltage) to be performed at a higher speed by first applying a first voltage (a voltage close to the tru... | 08/12/2008 |
| 7379013 | Detecting objects within a near-field of a frequency modulated continuous wave (FMCW) radar system The present disclosure relates to a radar device and technique for detecting the presence of objects located in the near-field of a frequency modulated, continuous wave (FMCW) radar device. The technique includes transmitting and receiving a frequency modulated sign... | 05/27/2008 |
| 7259713 | Ranging systems A continuous wave ranging system, comprising a modulator 2 for modulating an r.f. carrier wave in accordance with a pseudo random code, a transmitting antenna 5 for radiating the modulated signal towards a target, a receiving antenna 6 and recei... | 08/21/2007 |
| 7215208 | Fully integrated frequency generator Embodiments of the present invention include a frequency generator comprising a feedback loop with a transmission line integrated on a single integrated circuit. In one embodiment, a frequency generator comprises a phase detector and a voltage controlled oscillator ... | 05/08/2007 |
| 7199751 | Radar equipment A radar equipment of the present invention amplifies a reception signal with feedback based on the delay amount obtained from the correlation detection result. Accordingly, it becomes possible to maintain the reception signal (demodulated signal) level to a proper l... | 04/03/2007 |
| 7193555 | System and method for detecting emitter signals in the presence of unwanted signals A method for receiving at least one signal emitted by at least one emitter includes defining a first dwell associated with a first signal. The first dwell has a frequency range that overlaps at least a portion of a frequency range of a second signal. The method also... | 03/20/2007 |
| 7176826 | System and method for detection of emitter signals using multiple intercept rules A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. A rule-based system is provided for determining how emitters should be detected by a detection system. Rules m... | 02/13/2007 |
| 7068209 | System and method for detecting and jamming emitter signals A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. In one embodiment, the scan strategy may be computed to operate in a manner cognizant of on-board active jamme... | 06/27/2006 |
| 7019684 | Phase lock loop circuitry An arrangement for reducing the effect of vibration-induced changes in phase of the first local oscillator in a tracking receiver wherein final detection is accomplished by a synchronous detector in a phase lock loop incorporating a voltage-controlled oscillator is ... | 03/28/2006 |
| 7002509 | Method and system for emitter identification using transmission signatures A Method and System for Emitter Identification Using Transmission Signatures is disclosed. Also disclosed is a system that is able to take in the undemodulated IF of the receiver and perform identification algorithms on that data. The system is further able to perfo... | 02/21/2006 |
| 6995705 | System and method for doppler track correlation for debris tracking The present invention is directed to a system and method for Doppler track correlation for debris tracking in PCL radar applications. The disclosed embodiments describe the systems and methods used in the detection of debris pieces and the association of the Doppler... | 02/07/2006 |
| 6831592 | Near-vertical incidence HF radar An HF radar system comprises a transmitting system, a receiving system, a signal processing system and a frequency management/ionospheric sounding system. The transmitting system comprises a transmitting antenna array configured to transmit a beam in a near vertical... | 12/14/2004 |
| 6801155 | Method and apparatus for recognising a radar target A method of recognizing a radar target comprises producing a sequence of Doppler spectra of radar returns form a scene and producing therefrom a sequence of Doppler feature vectors for a target in the scene. Hidden Markov modelling (HMM) is then used to identify the... | 10/05/2004 |
| 6753803 | Signal detection A transmitted signal and a received signal are combined and the combination is expected to determine whether or not a target signal is present. Either the transmitted signal or the received signal is combined with an auxiliary signal containing a range of frequencie... | 06/22/2004 |
| 6691031 | Method and apparatus for substituting sensor data for satellite signal in GPS receiver Embodiments of the present invention are directed to a method and apparatus for substituting temperature sensor data for a satellite signal in a GPS receiver. In one embodiment of the present invention, a mathematical model of a GPS receiver's clock's res... | 02/10/2004 |
| 6653974 | Method for clearly determining the intermediate frequency difference in a frequency-controlled radar system In a method for the determination of the unambiguous range for the measurement of the IF deviation in a frequency-regulated radar system, a frequency adjustment or tuning of the radar system is carried out during the reception of an echo signal by adjusti... | 11/25/2003 |
| 6650271 | Signal receiver having adaptive interfering signal cancellation A radar system receiver having an antenna system adapted to receive a jammer signal from both a direct path and from an indirect path. The direct and indirect paths have both differential Doppler frequency and differential time delay induced phase shifts.... | 11/18/2003 |
| 6618001 | Apparatus for detecting signal A radar signal detecting apparatus is provided. The radar signal detecting apparatus includes a coupler diverging a part of signal from received signal, a local oscillator outputting local signal, a mixer converting the diverged signal multiplied the loca... | 09/09/2003 |
| 6486826 | Arrangement for the precise distance measuring, in particular the filling level measuring An arrangement for the precise measuring of the distance with a FMCW radar device having a frequency-variable digitally-actuated oscillator to generate a transmitting frequency which can be tuned over a predetermined frequency range. The digital actuation... | 11/26/2002 |
| 6411199 | Radio frequency identification system A radio frequency identification system includes a transponder and a transponder reader. The transponder, responsive to an interrogation signal continuously transmitted by the transponder reader, generates a transponder signal modulated by an identificati... | 06/25/2002 |
| 6297764 | Radar receiver having matched filter processing An electronic counter-measure receiver can be colocated with a threat simulator radar, which transmits a radar signal. As a pulsed-Doppler signal, this transmitted radar signal is sampled as a reference signal by the receiver to determine quadrature, cohe... | 10/02/2001 |
| 6295017 | Jammer detection and tracking system A radar receiver adapted to detect and track a narrow band jammer is shown to include logic circuitry adapted successively to sense jamming signals from such a jammer to determine the extant frequency of the speed gate when the amplitude of the automatic ... | 09/25/2001 |
| 6133865 | CW converter circuit A circuit for use in anti-radar missile seekers or radar counter-measure eivers to convert the signals received from continuous wave radars into pulse signals so that the signals may be more readily detected and can be processed in the same signal proces... | 10/17/2000 |
| 6100845 | Emitter location using RF carrier or PRF measurement ratios A method and apparatus for determining from a moving observer the location, in terms of latitude, longitude, altitude, and velocity, of a stationary or moving radar emitting a pulsed or continuous-wave signal. The moving observer extracts from the radar s... | 08/08/2000 |
| 6094588 | Rapidly tunable, high-temperature superconductor, microwave filter apparatus and method and radar receiver employing such filter in a simplified configuration with full dynamic range A narrow bandwidth (1 to >100 MHz) HTS microwave filter (30 or 50) is described which is tunable over a moderate frequency range (100 to >1000 MHz at X-band). The low loss ( | 07/25/2000 |
| 6091356 | Chirp source with rolling frequency lock for generating linear frequency chirps A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate a chirp. The FM coil is coupled to receive a PLL error sig... | 07/18/2000 |
| 6072423 | Method for measuring the doppler shift in a sensor system using ambiguous codes The invention relates to methods which make it possible to measure the Doppler shift of the echoes of a detection system. That is, the present invention modulates the frequency of the pulses of the transmissions of this system by a pseudohyperbolic functi... | 06/06/2000 |
| 5864313 | Process for determining the intermediate frequency deviation in frequency pulsed radar systems The invention relates to a process for determining the deviation of the intermediate frequency from a given reference frequency (fR) in the case of a frequency-pulse radar system, characterized by the time-related scanning of the echo signal such th... | 01/26/1999 |
| 5654716 | Circuit for short duration multiple look pulse based frequency measurement A low cost automatic frequency control system measures short duration radio frequencies with high a degree of accuracy within 0.5 MHz. The system is programmable to allow applicability over a wide range of frequencies within the required accuracy and vari... | 08/05/1997 |
| 5442362 | Radar apparatus Radar apparatus provided with a signal generator (1), transmitter means (2), antenna means (3), receiver means (4), a video processor (6) and an indication device (7) for the generation of a radar picture of the surroundings of the radar apparatus with a ... | 08/15/1995 |
| 5438332 | Method of hardening transmissions, in particular between a control station and a transponder, and a device implementing the method To harden transmissions, in both directions, between a master station (1) and a slave station (2), a table of communication parameter values is memorized in each station and the table values are then used in accordance with the master station's decision. ... | 08/01/1995 |
| 5355141 | Channelized bearing processor A channelised bearing processor comprises a channelised receiver consisting of a plurality of i.f. receivers (34 to 42) covering contiguous parts of a predetermined frequency range. Each of the receivers (34 to 42) is connected to a respective, continuous... | 10/11/1994 |
| 5175553 | Telemetric process for measuring short distances A telemetric process for measuring short distances comprises emitting an electromagnetic signal modulated by a pseudo-random sequence having a number (n) of bits delivered at a clock frequency (fH), correlating the echo detected with the modulated signal ... | 12/29/1992 |
| 5059969 | GPS satellite signal tracking method for GPS receivers A method for recapturing a satellite at the highest elevation angle as quickly as possible with a GPS receiver having a plurality of receiving channels when a state of receiving satellite signals recovers to normal after having been interrupted by obstacl... | 10/22/1991 |
| 5036327 | Single oscillator FSK pulsed radar receiving transmitter An improved radar receiver transmitter uses a single oscillator frequency shift keyed system in which the oscillator shifts rapidly between a pulsed output frequency and a local frequency such that the system can transmit at one frequency and shift fast e... | 07/30/1991 |
| 5017921 | Radar system and a method for operating a radar system A radar system and a method of operating a radar system. The radar system comprises a transmitter-receiver subsystem to transmit a series of electromagnetic pulses, to scan those pulses across an area of interest, and to receive echoes of the pulses. The ... | 05/21/1991 |
| 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 |
| 4600924 | Automatic frequency control for radar receiver A digital automatic frequency control for a pulse-type radar receiver having a voltage controlled local oscillator. A first digital number is generated and converted to a first analog voltage for coarse control of the local oscillator frequency. The first... | 07/15/1986 |
| 4513285 | Quasi coherent two-way ranging apparatus An accurate radio frequency ranging system is provided for measuring the time required for a signal to be transmitted from a ground station to a remote station and to be returned to the ground station. The ground station is provided with a master referenc... | 04/23/1985 |
| 4484193 | Radar apparatus for detecting and/or classifying an agitated reflective target when relative translation obtains Improved non-cooperative radar apparatus locates and type-classifies an agitated, vibrating reflective target (e.g., a vehicle with its engine running) - whether the target is moving or stationary. A receiver with a cooperating band pass filter extracts a refl... | 11/20/1984 |
