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| Number | Title | Issue Date |
| 7154433 | Method and device for the detection and track of targets in high clutter A method for discriminating and tracking a target in a clutter cloud includes transmitting a radar signal at a signal bandwidth to: identify a range extent of a clutter cloud; determine a centroid and a velocity growth rate of the clutter cloud; and identify a direc... | 12/26/2006 |
| 7095358 | Technique for cancellation of elevated clutter for the detection of fixed and ground moving targets under trees A target is detected under a forest canopy or other elevated clutter where the target is obscured by the elevated clutter. Radar returns reflected from the target on the surface, combined with those from the elevated clutter are digitized. Motion compensation is per... | 08/22/2006 |
| 7095363 | Pulse radar apparatus A pulse radar apparatus uses different frequencies, for example, frequencies one of which is a multiple or a submultiple of the other for a signal which becomes a reference of a control pulse for controlling a gate operation for a reception signal and a signal which... | 08/22/2006 |
| 7068216 | Method for the linearization of FMCW radar devices A method for the linearization of frequency modulated continuous wave (FMCW) radar devices having non-linear, ramp-shaped, modulated transmitter frequency progression x(t). With this invention, a correction phase term for compensation of the phase error in the recep... | 06/27/2006 |
| 6741202 | Techniques for 3-dimensional synthetic aperture radar The height of a radar target above a horizontal plane at a location within the horizontal plane is measured using a synthetic aperture radar (SAR). The synthetic aperture radar is mounted on a moving platform. The moving platform moves along a continuous climbing pa... | 05/25/2004 |
| 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 |
| 6608584 | System and method for bistatic SAR image generation with phase compensation A method and bistatic synthetic aperture radar (SAR) imaging system generate an image of a target area without knowledge of the position or velocity of the illuminator. The system includes an illuminator to illuminate a target area with a null-monopulse r... | 08/19/2003 |
| 6591146 | Method for learning switching linear dynamic system models from data From a set of possible switching states and responsive to a sequence of measurements, a corresponding sequence of switching states is determined for a system having a plurality of dynamic models, associates each model with a switching state such that a mo... | 07/08/2003 |
| 6525686 | Receiving/transmitting apparatus and radar equipment The present invention relates to a receiving/transmitting apparatus for radiating a predetermined signal and receiving a signal arriving as a response to the radiated signal, and to a radar equipment in which the receiving/transmitting apparatus is instal... | 02/25/2003 |
| 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 |
| 5952955 | Compensation for radar path length variation and phase error Methods that compensate for phase errors caused by path length variations in a radar system, and that compensate for relative phase errors in upconvertor and downconverter references employed in the radar system. One method samples a signal reflected from... | 09/14/1999 |
| 5940025 | Noise cancellation method and apparatus A radar transmitter for producing a radar signal in response to a radar trigger signal fed thereto. The transmitter includes a radio frequency oscillator for producing a signal having a radio frequency carrier to be used in each transmitted radar signal. ... | 08/17/1999 |
| 5790067 | Jam-resistant radar apparatus with phase shift provisions Radar apparatus provided with a transmitting unit (1), having a transmit phase shifter for providing each transmitted pulse in a burst with a selected phase shift, and a receiving unit (7), having a receive phase shifter (9) for cancelling the selected ph... | 08/04/1998 |
| 5525997 | Self-calibrating, eigenstructure based method and means of direction finding A method of estimating the directions of radiating sources (56, 58, 60) with respect to an array (46) of a number of antenna elements (48), each of which elements has a separate gain/phase control (50). With nominal gain and phase selected a first estimte... | 06/11/1996 |
| 5473332 | RFI suppression circuit and method Improvement of radar sign-to-noise ratio and detection sensitivity in radar systems is achieved by methods employing the subtraction of the unwanted radio frequency interference, RFI, or "clone" signals thereof, from the total received signal. The Clone s... | 12/05/1995 |
| 5469173 | Monitoring phase characteristics of BPSK and CW signals Discernible frequency characteristics regarding BPSK and CW signals are dved from consecutive transform outputs of a dual channel chirp-Z processor. Physically separated antennas direct the signals to the chirp-Z channels and concurrently occurring trans... | 11/21/1995 |
| 5311189 | Method for distinguishing between at least two targets The present invention relates to a pulse Doppler radar wherein the phase position of the reflected signals is evaluated as the most important component in addition to the amplitude. Thus a very good resolution results in the range direction and in the vel... | 05/10/1994 |
| 5233351 | Local oscillator arrangement for a monopulse receiver in a semiactive missile guidance system An improved local oscillator arrangement for a monopulse receiver in a semiactive missile guidance system is shown. The monopulse receiver includes an improved reference local oscillator wherein a first local oscillator signal and a pair of reference sign... | 08/03/1993 |
| 5150128 | In-phase and quadrature conversion error compensator A system for detecting phase and gain imbalance errors in a synchronous detector. The synchronous detector (10) is assumed to have a fist circuit (16) for providing a first signal representing a first sinusoidal term (e.g., a cosine term) and for providin... | 09/22/1992 |
| 5041836 | Self-steered antenna system An antenna system determines the true time delay in two or more correlated signals without a priori knowledge of the time relationship between the signals and uses the determined true time relationship to achieve maximum signal combinations of received an... | 08/20/1991 |
| 4554548 | Side-lobe suppressing unit for a pulse radar apparatus In a pulse radar apparatus the receiver comprises a main transmission channel connected to a directional antenna and an interference canceller connected to said channel for selecting target returns obtained through the major lobe of the antenna radiation ... | 11/19/1985 |
| 4249179 | Circuit arrangement for displacing the clutter spectrum in a radar receiver A circuit for a pulse Doppler radar receiver in which a measuring signal for determining the mean frequency of disturbing low frequency received clutter signals is obtained from which there is determined a control signal for operating a circuit that prece... | 02/03/1981 |
| 4155086 | Clutterlock with displaced phase antenna This invention relates to a clutterlock with displaced phase antenna, and more particularly to a means to provide a control signal generated from radar signals which may be used to maintain alignment between the physical and synthetic beams of a coherent ... | 05/15/1979 |
| 4064511 | Clutter subtraction system A radar system having transmitted and received signals, the system including a feedback loop for modulating a sample of the transmitted signal to duplicate the phase and amplitude of the clutter echoes from nearby points of reflection. The modulated trans... | 12/20/1977 |
| 4042924 | MTI clutter tracking and cancelling system A clutter tracking and cancelling system, for use in a MTI radar system, comprising an auxiliary channel consisting primarily of a phase detector and a canceller. The phase detector provides an output which represents the phase difference between the IF a... | 08/16/1977 |
| 4024540 | Continuous wave FM tone ranging radar with predetection averaging A CW FM TR radar receiver responsive to a local tone modulation source and a return signal having a carrier frequency modulated by the tone is particularly adapted to handle a return signal containing different returns derived from multiple targets and/or... | 05/17/1977 |
| 3995271 | Adaptive clutter cancellation and interference rejection system for AMTI radar In an AMTI radar having digital doppler processing, adaptive clutter and interference rejection is achieved by automatically adjusting antenna phase and amplitude weights to trim for uncalibrated errors and to put nulls in the antenna receive patterns in ... | 11/30/1976 |
| 3942177 | Interferometer radar elevation angle measurement apparatus In the measurement of the phase difference (proportional to the elevation angle of a target) provided by the radar target signals that are received by each antenna of an antenna array, a comparison of the responses of the signal processing circuitry to th... | 03/02/1976 |
