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| Number | Title | Issue Date |
| 4231037 | Radar clutter suppressor This disclosure describes a radar clutter suppressor and target classifier that compares two or more video signals. Various signal conditioning and processing means are used for enhancing echo differences between targets and clutter caused by differences ... | 10/28/1980 |
| 4213130 | Monopulse radar apparatus The invention relates to monopulse radar for automatic angle tracking of a moving target, which prevents angle tracking errors from occurring when the polarization of the received signals is orthogonal to the polarization of the radar receiver. The monopu... | 07/15/1980 |
| 4191953 | Intrusion sensor and aerial therefor Perimeter protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter to a receiver. The transmitter and receiver have associated beam antennas of extended vertical aperture of not less than 0.75... | 03/04/1980 |
| 4184156 | Doppler radar device for measuring speed of moving objects A doppler radar device for measuring the speed of moving objects, which comprises a casing with an antenna, a transmitter-receiver unit and a data-processing unit enclosed therein, control elements and a power cable. The casing is formed with an elongated... | 01/15/1980 |
| 4160251 | Hybrid dual mode radiometric system An improved high frequency radiometric system features time shared passive and active modes of operation for correlation of active and passive signal returns. The processed, normalized, and stored passive signals are subtracted from similarly treated acti... | 07/03/1979 |
| 4156874 | Anti-collision vehicle radar system The anti-collision vehicle radar system overcomes interference problems due to radar beams from similar radar systems on other vehicles by providing a radar transmitter having a transmitting antenna which transmits a radar beam having circular polarizatio... | 05/29/1979 |
| 4114153 | Echo location systems This invention generally relates to echo location or ranging systems in which the individual properties of targets or reflectors (such as range, bearing, elevation angle, relative velocity, impedance contrast, etc.) in a field of targets within some propa... | 09/12/1978 |
| 4107678 | Polarization correlation target seeker A target seeker circuit contained in a projectile having a trajectory guidance mechanism cross-correlates returns of a cross-polarized antenna pattern to distinguish between target returns reflected by man-made targets and clutter returns reflected by nat... | 08/15/1978 |
| 4106014 | Radar set sensitive to target shape The circuitry includes a pulse radar set including a transmitter and a fi receiver which share a common antenna which is arranged to both launch and receive plane polarized waves at 45° to the earth's surface. A second antenna and receiver are arranged ... | 08/08/1978 |
| 4079361 | Intrusion sensor and aerial therefor Perimeter protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter to a receiver. The transmitter and receiver have associated beam antennas of extended vertical aperture of not less than 0.75... | 03/14/1978 |
| 4068234 | Frequency scanned illumination imaging array Disclosed herein is an imaging system comprising a linear array of receivers and a single transmitter deployed and operated in such a manner as to produce the equivalent of a completely filled, two-dimensional array.... | 01/10/1978 |
| 4053882 | Polarization radar method and system A polarization radar method and system employs polarization discrimination to obtain target-to-clutter enhancement. The polarization of the radar is rotated at very fast rates. The polarization is rotated at least 360° during one pulse and discrimination... | 10/11/1977 |
| 4035797 | Polarized radar system for providing target identification and discrimination A diplex doppler radar is described which includes an RF generator which generates an RF signal alternating between two selected frequencies. The RF signals are selectively vertically or horizontally polarized and transmitted by an antenna. A circuit is r... | 07/12/1977 |
| 4028708 | Antenna feed for dual beam conical scan tracking radar An improved antenna feed providing control of the plane of polarization ecially useful with "scanning with compensation" radar tracking. An input transducer is coupled to first and second output transducers whereby the output transducers transmit two pen... | 06/07/1977 |
| 4011445 | Optical array active radar imaging technique An optical target imaging system having a laser transmitter that provides a dual pulse sequence target illuminating field. One pulse of the dual pulse field is predominantly polarized in one direction and the other pulse is predominantly orthogonally pola... | 03/08/1977 |
| 4005425 | Dual quadrature polarization radar system A radar system provides a measurement of the co-linear and cross-polarization characteristics of a radar target. Vertically and horizontally polarized RF signals are selectively transmitted to a target and the co-linear and cross-polarized RF returns from... | 01/25/1977 |
| 4005414 | Method for providing means to eliminate ambiguous polarization effects on phase and amplitude of radar backscatter due to unknown target aspect angle A radar system is operated in a manner that provides determination of the coincidence of radar signal polarization with the major axis of a target of unknown aspect angle. This information so obtained can be utilized to enhance radar signals or to improve... | 01/25/1977 |
| 3988732 | 3-Channel selectable polarization, target discrimination antenna A monopulse radar antenna having an improved three-channel feedhorn for piding selectable polarization and greater target discrimination. The antenna feed employs a comparator having a difference port, a first sum port, and a second sum port utilizing a ... | 10/26/1976 |
| 3962705 | Radar microwave lobing systems 4. A radar system responsive to unmodulated elevation error signals, azimuth error signals and sum signals comprising a modulator responsive to the elevation and azimuth error signals coupled in space quadrature for rotating said error signals at a predet... | 06/08/1976 |
| 3958241 | Chaff discrimination system 1. A microwave radio fuze system for a missile having means for discriminng between a target and chaff comprising in combination, a pair of oppositely polarized transmitting antennas operably connected to a frequency modulated oscillator by a first switc... | 05/18/1976 |
| 3952305 | Marine radar transmission and reception system A marine radar transmission and reception system in which first and second transmission pulse radar waves are emitted as first and second pulse radar waves from first and second radar antennae or a common radar antenna; reflected waves of the first and se... | 04/20/1976 |
| 3945005 | Surveillance radar 1. In a radar apparatus having a pulsed transmitter source of linearly poized radio-frequency energy, a duplexer, a receiver, and a directional antenna system including a rotatable dipole antenna for radiating linearly polarized radio-frequency energy, m... | 03/16/1976 |
| 3938157 | Rotatable radar antenna feed and receiver horn A rotatable radar antenna feed and receiver horn having two summing ports d a difference port with a rotatable section having a plurality of susceptor pins to rotate the polarization of the transmitted and received electromagnetic energy to reduce or mini... | 02/10/1976 |
| 3936838 | Multimode coupling system including a funnel-shaped multimode coupler A multimode coupling system includes a funnel-shaped coupling member having one coupling aperture at the narrow end thereof, one larger coupling aperture at the larger end thereof, and a plurality of coupling apertures in the side wall thereof. A first an... | 02/03/1976 |
