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| Number | Title | Issue Date |
| 5426435 | Open loop proximity detector An open loop proximity detector is contemplated which receives a Doppler frequency when a target is first detected, and predicts a specific fuzing Doppler frequency. The detector continues to transmit and receive electromagnetic waves and sends a detonati... | 06/20/1995 |
| 5172123 | Frequency feedback linearizer Range resolution in an FMCW radar system is achieved by providing a periodic linear frequency sweep. The present invention assures the linearity of this sweep by using a negative feedback circuit which includes means for obtaining 16 sequential instantane... | 12/15/1992 |
| 5160264 | Radar target simulator A programmable radar target simulator provides microwave signals for testing a missile that is otherwise controlled by such signals when it is deployed. The simulator has the capability for initiating suitable microwave signals at the proper power levels ... | 11/03/1992 |
| 5148178 | Precision ranging system The range (R) to a target (12) is precisely determined by controlling the amplitude of the carrier before modulation using a feedback signal derived from the detected return. The amplitude of the carrier is adjusted (40) so that all return pulses have a c... | 09/15/1992 |
| 5081457 | Apparatus for reducing synchronous fruit in TCAS surveillance systems A system wherein TCAS transmissions have two jitter components added to the jitter component utilized in the interscan interval to minimize TCAS interference with ground station operation. The jitter components minimize the establishment of false intruder... | 01/14/1992 |
| 5064376 | Portable compact simulated target motion generating system A portable compact target motion simulation system, adapted to generate simulated target motion for displaying, tracking, and controlling a plurality of simulated targets on a display device for training purposes. The system is operable to generate pre-pr... | 11/12/1991 |
| 5027125 | Semi-active phased array antenna A module disposed at each radiating element of a phased array antenna, the module having a limiter, a low-noise amplifier and a phase shifter. One embodiment includes a DPDT switch to permit use of a common phase shifter on transmit and receive. On transm... | 06/25/1991 |
| 5003316 | Single null miniature direction finder A single null miniature direction finder which may be worn on the arm of the user and is fully automatic in operation. Signals from a single loop antenna and a sense antenna are summed; however, the amplitude of the sense signal is adjusted at first and s... | 03/26/1991 |
| 5003314 | Digitally synthesized phase error correcting system A system for correcting phase errors in a space based radar system utilizing probes located in front of an array of lens elements of a phased array antenna. Included is a mechanism for supplying a stored perfect value signal indicative of the distance bet... | 03/26/1991 |
| 5000567 | Laser radar system for detecting an object A laser radar system for detecting objects transmits a laser beam which is frequency modulated by the motion of scanning mirrors, which scan the beam across an object to be imaged. The return beam, reflected by the object, is combined with the local oscil... | 03/19/1991 |
| 4999636 | Range limiting system Briefly, the range limiting system of the invention is capable of differentiating desired received signals having an amplitude above a predetermined threshold level and at least one other recognizable predetermined characteristic, from other received sign... | 03/12/1991 |
| 4997282 | Dual fiber optic gyroscope A fiber optic gyroscope includes a sensing coil formed of ordinary single mode fiber and a module including polarization maintaining optical fibers. A clockwise beam guided by a polarization maintaining fiber passes through a polarizer before being input ... | 03/05/1991 |
| 4992794 | Transponder and method for the production thereof An implantable transponder has a plastic holder having a hollow interior and preferably a rough outer surface, a transmit/receive unit within the hollow interior of the holder, and an electronic element electrically connected to said transmit/receive unit... | 02/12/1991 |
| 4992795 | Method and device for the validation of plots, for radar, with self-adaptive updating To make an "intelligent" selection, in a radar, of the piece of information transmitted to the tracking unit by the extractor, in case of saturation, a method comprising the first step of selecting a set of N attributes (x1, x2, . . ... | 02/12/1991 |
| 4989008 | Spotlight mapping radar system The receiving apparatus of a spotlight mapping radar system is provided with a digital beamforming antenna capable of converting the echo signals received by a plurality of antenna elements into corresponding digital signals and processing them by DFT and... | 01/29/1991 |
| 4989006 | Microwave absorption system Microwave absorption in a varying magnetic field is investigated near electron cyclotron resonance with a network analyzer which is capable of swept frequency measurements, and of measuring reflection and transmission coefficients from 0.045 to 18 GHz, wi... | 01/29/1991 |
| 4989009 | Digital range correlator A digital range correlator is disclosed which provides a correlation scheme which can be mechanized and produced repeatedly with minimal need for offsets and reduced power supply sensitivity. CCDs are eliminated and the need for channel-to-channel matchin... | 01/29/1991 |
| 4986635 | High efficiency nonlinear Kerr effect filter An optical filter for blocking radiation of preselected wavelength is described which comprises a colloidal suspension of an optical medium and a multiplicity of microspheres of optical dimensions in a substantially regular three-dimensional array, the op... | 01/22/1991 |
| 4983976 | Signal transmission system and method A data transmission system includes a data carrier which has a memory for storing therein data including an identification code and which is attached to an object and a main apparatus having a microwave oscillator so as to conduct communications with the ... | 01/08/1991 |
| 4982195 | Servo control with self calibrating preset A frequency input for receiving a frequency signal and digital storing for storing the received frequency signal. A controller has a first and second input and an output. The first input is connected to the digital storage for providing a reference signal... | 01/01/1991 |
| 4982196 | Radar target simulator The present invention provides a radar simulation system with at least two counters. The first counter is a coarse counter 20/30 that counts a transmit pulse interpulse periods to provide a coarse return delay at the beginning of a radar look. The second ... | 01/01/1991 |
| 4979816 | Range sensing system An optical range sensing system that includes a source (80) for producing a pulse of light directed toward an object, and a receiver that comprises a photosensitive charge integrating device (90). The receiver receives a return pulse reflected by the obje... | 12/25/1990 |
| 4980633 | Method and apparatus for measuring a vehicle's own speed by the Doppler radar principle A method for measuring a vehicle's own speed by the Doppler radar principle, in accordance with which microwaves of a transmission frequency are sent out by the vehicle, a part thereof being reflected back and mixed with the microwave signal at transmissi... | 12/25/1990 |
| 4980688 | Regenerator A radar countermeasure comprising an inflatable balloon, a corner reflector ounted inside said balloon, and means mounted on top of said balloon for destroying said balloon upon the incidence of a search radar beam, said means comprising a radar receiving ... | 12/25/1990 |
| 4978221 | Laser distance and altitude measuring apparatus Two laser distance measuring functions are preformed on board of a ground-hugging cruise missile by at least one laser distance meter for taking downwardly directed altitude measurements and diagonally or slantedly forwardly directed distance measurements... | 12/18/1990 |
| 4975703 | High resolution short range radar A short range, high resolution, radar system of particular use in training radar operators. The system transmits very short pulses of a radio-frequency (RF) signal at a very high pulse repetition frequency, PRFo. A signal pre-processor samples ... | 12/04/1990 |
| 4975704 | Method for detecting surface motions and mapping small terrestrial or planetary surface deformations with synthetic aperture radar A technique based on synthetic aperture radar (SAR) interferometry is used to measure very small (1 cm or less) surface deformations with good resolution (10 m) over large areas (50 km). It can be used for accurate measurements of many geophysical phenome... | 12/04/1990 |
| 4975707 | Multiple satellite locating system A locating system employs a multiple satellite configuration employing rotating scanning patterns for generating peak signal data which can be used to calculate the position of a signal source within a scanned region. One preferred embodiment utilizes two... | 12/04/1990 |
| 4973965 | Passive radar target A passive radar target comprises a sond lens (50) of substantially uniform dielectric constant, having a reflecting surface (51) integrally formed therewith, the lens being constructed of particulate material having a dielectric constant selected such tha... | 11/27/1990 |
| 4973969 | Coherent frequency burst detector apparatus and method A method and apparatus for automatically detecting a coherent frequency burst is disclosed. The apparatus 10 determines the approximate frequency and duration of the burst. The apparatus 10 operates utilizing principles of autocorrelation to reject random... | 11/27/1990 |
| 4973964 | Method for orienting a radar installation against a target A method for orienting a radar installation which possesses an at least approximatingly axial-symmetrical antenna radiation or beam characteristic towards a target. The radar beam which is emitted by the radar installation is reflected or scattered back a... | 11/27/1990 |
| 4973970 | Integrated automated system for waste site characterization A system for characterizing contamination levels of a selected site uses a base station for the collection of data and generating waste site characterization and remediation needs reports. An on-site station is provided to detect the contamination levels ... | 11/27/1990 |
| 4972194 | Method and device for compensating for the speed of clutter in a coherent doppler radar with variable blind speed In a doppler radar, in order to compensate for the speed of moving clutter, one first establishes during a burst of order (i) the phase variation $c;ri from one period to the next and which is due to clutter in a given range cell. Then, this... | 11/20/1990 |
| 4972192 | Constant amplitude doppler producing radar reflector A constant amplitude Doppler producing radar reflector for simulating a moving target. A plurality of dihedral reflectors having equal radar cross sections are rotated axially at equal rotational speeds. The dihedral reflectors are separated laterally and... | 11/20/1990 |
| 4970519 | Continuously transmitting and receiving radar A CW radar comprises a substantially continuously operable transmitter (10) and receiver (16,18,20), signal operating means (12,14) for radiating the transmitter signal and for receiving at least the return signal and a reflected power canceller (RPC) cir... | 11/13/1990 |
| 4968967 | Continuously transmitting and receiving radar A continuously transmitting and receiving radar comprises a transmitter (10), a receiver (16), an antenna (12) and a circulator (14) for effecting communication between the transmitter and the antenna and between the antenna and the receiver. A reflected ... | 11/06/1990 |
| 4968968 | Transmitter phase and amplitude correction for linear FM systems A system is disclosed for measuring and correcting for waveform modulation errors in a radar system employing FM signals and a digitally controlled waveform generator. The system relies on the assumption that the transmitter and other waveform phase and a... | 11/06/1990 |
| 4967201 | Multi-layer single substrate microwave transmit/receive module A microwave transmit/receive module comprises a single multi-layer substrate having at least two opposed mounting surfaces. The substrate including a plurality of integrated dielectric layers, electrical conductors and thermal conductors selectively inter... | 10/30/1990 |
| 4965586 | Position determination and message transfer system employing satellites and stored terrain map A radio position determation and message transfer system is implemented using a pair of satellites in geostationary orbit for replaying interrogation and replay signals between a ground station and a user-carried transceiver. The user portion is calculate... | 10/23/1990 |
| 4965582 | Method for radar mapping an area and a radar equipment to carry out the method The invention relates to a method for radar mapping an area and a radar equipment for wideband exploration at frequencies below 300 MHz. A large number of frequencies, for instance 1000, are distributed over a frequency band between for instance 12.5 and ... | 10/23/1990 |
