Quotables
"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7362261 | Linear frequency-modulated pulse radar A linear frequency-modulated pulse radar system is provided in which the echo signal is mixed with a de-ramp signal, in order to reduce the bandwidth. The transmission signal of the pulse radar and the de-ramp signal are generated with the same reference oscillator,... | 04/22/2008 |
| 7310062 | Dual antenna diversity method to detect GPS signal tampering A method of detecting GPS signal tampering uses two GPS receivers. A first receiver measures carrier phases of two or more satellite signals and of a tampered signal. A second receiver measures carrier phases of the two or more satellite signals and the tampered sig... | 12/18/2007 |
| 7269152 | Method and apparatus for transmitting information within a communication system A node within a communication system periodically broadcasts its interference status to neighboring nodes within the communication system. Additionally, the node receives an interference status from all neighboring nodes. If communication is desired with a neighbori... | 09/11/2007 |
| 7184493 | Pulse sorting apparatus for frequency histogramming in a radar receiver system Disclosed is a real-time pulse sorting apparatus of a preprocessor in a pulsed radiation detection system. The apparatus, responsive to digital signals generated by a system receiver, uses the instantaneous frequency as the address input to store discrete data group... | 02/27/2007 |
| 7079987 | Tunable filter device for spatial positioning systems A device for spatial positioning systems includes a programmable measurement filter that is dynamically tuned by the device signal processing unit. The signal processing unit analyzes available data including the measurement signal to determine the likelihood that a... | 07/18/2006 |
| 7024188 | Wireless communications system with detection of foreign radiation sources The invention discloses a method for use in a wireless communications system with a plurality of broadcasting nodes, comprising the step of enabling one node in the system to function as a central node in said system and letting said node enable measurements on at l... | 04/04/2006 |
| 7010262 | Techniques for circumventing jamming of global positioning system receivers A method and apparatus for circumventing jamming of receivers for a global positioning system (GPS) include determining that a receiver is being jammed by a jamming signal not originating from the GPS. A first signal is transmitted from a portable unit including the... | 03/07/2006 |
| 6995660 | Commander's decision aid for combat ground vehicle integrated defensive aid suites A decision aid for use in the defense of a combat ground vehicle which includes a track fusion element, a threat typing element, threat prioritization element, and a countermeasures (CM) selection element. ... | 02/07/2006 |
| 6937639 | System and method for positioning pulses in time using a code that provides spectral shaping A system, method and computer program product for positioning pulses, including positioning pulses within a specified time layout according to one or more codes to produce a pulse train having one or more predefined spectral characteristics where a difference in tim... | 08/30/2005 |
| 6933878 | Wide bandwidth radar A wave-form generator drives a number of microwave generating devices each operating at different frequency bands. The output of each microwave generator is connected to its own transmission channel of limited bandwidth which contains all the non-linear components n... | 08/23/2005 |
| 6798375 | Radar device and a method for suppressing interference in a radar device A radar device includes elements for generating a carrier signal having a carrier frequency fT, elements for generating pulses with a pulse repetition frequency fPW, elements for distributing the carrier signal to a transmission branch and a re... | 09/28/2004 |
| 6748351 | Modular covert remote electronic warfare simulator An apparatus for electronic warfare signal simulation which is used in an external test system to simultaneously test a plurality of “victim” communication systems for vulnerability to jamming. The test system includes a remote radiator of a signal free of jammi... | 06/08/2004 |
| 6650270 | Radar system The present invention describes a system for counteracting countermeasures against radar detection. Two known countermeasures are "phase front tilting" and "isotropic scattering." The invention accomplishes this counteraction by deliberately producing a t... | 11/18/2003 |
| 6639541 | Device and method for detecting, measuring, and reporting low-level interference at a receiver An inexpensive, reliable apparatus and method for autonomously monitoring, measuring the incident level, recording, comparing, reporting, and optionally displaying an indication of intentional or unintentional low-power interfering signals or emissions, i... | 10/28/2003 |
| 6486824 | Tracking radar receiver A tracking radar receiver as described herein is relatively invulnerable to image frequency jamming. Partial image-rejection down-converters down-convert RF signals to IF signals in each of various sum and difference receiver channels. Image frequency com... | 11/26/2002 |
| 6313782 | Coded phase modulation communications system A coded phase modulation communications system which relates to communications systems in which undesired detectability of the radiated signal is materially reduced, and wherein the vulnerability of the system to interfering signals, such as, intentional ... | 11/06/2001 |
| 6141371 | Jamming suppression of spread spectrum antenna/receiver systems A jamming suppression system which includes a plurality of receivers for receiving electromagnetic radiations and a separate notch filter coupled to each receiver for filtering selected frequencies from electromagnetic radiations received by each of the r... | 10/31/2000 |
| 5892477 | Anti-jam FM/CW radar A radar system (10) uses independent, adaptive modulation controls for the local oscillators (16, 40) in the transmitter (24) and receiver (26) portions. The adaptive modulation enables the radar to filter out any repeater jammer signal while maintaining ... | 04/06/1999 |
| 5539407 | Radar apparatus provided with ECCM facilities A radar apparatus that is provided with auxiliary antennas (5, 10) of an omnidirectional nature. In addition to customary ECCM applications, such as side-lobe suppression and side-lobe blanking, the auxiliary antennas (5, 10) are also used for the emissio... | 07/23/1996 |
| 5537117 | Closed loop countermeasure to passive direction finding and location of radar transmitters using Doppler techniques Method and apparatus for enabling a pulse echo radar to generate a false signal in both time and frequency based passive Doppler ESM location systems. The latter false signal causes the ESM system to mislocate the radar. The radar's reference oscillator f... | 07/16/1996 |
| 5534867 | Open loop countermeasure to passive direction finding and location of radar transmitters using Doppler techniques A method and apparatus for controlling the output characteristics of a radar emitter for thereby preventing the location of the emitter using Doppler techniques. The emitter's RF frequency and PRF are under the control of a random signal generator which c... | 07/09/1996 |
| 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 |
| 5377222 | Frequency agile radio A frequency agile spread spectrum radio system which uses a frequency-agile receiver that adaptively learns which frequencies to avoid as being occupied or jammed. The transmitter sends redundant transmissions on widely separated pseudo-random carrier fre... | 12/27/1994 |
| 5311541 | Frequency agile radio A frequency agile spread spectrum radio system which is capable of efficient frequency re-use and frequency sharing. The receiver adaptively learns which frequencies to avoid. The transmitter sends redundant transmissions on widely separated pseudo-random... | 05/10/1994 |
| 5291202 | Noise radars In a noise radar a pseudo-random sequence is generated repeatedly and used to phase modulate a transmitted signal. The transmission is interrupted during a number of periods during each pseudo-random sequence which allows returns from targets to be receiv... | 03/01/1994 |
| 5168215 | Instantaneous frequency measurement apparatus and method An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite signal, filtering the squared signal for separating a first pas... | 12/01/1992 |
| 5099243 | Digital frequency measurement receiver with bandwidth improvement through multiple sampling of complex signals This is a technique for extending the frequency range which employs in-phase and quadrature components of the signal coupled with non-uniform sampling to gain the advantages of a high sampling rate with only a small increase in the number of samples. By s... | 03/24/1992 |
| 5099194 | Digital frequency measurement receiver with bandwidth improvement through multiple sampling of real signals This proposed approach to extending the frequency range uses non-uniform sampling to gain the advantages of a high sampling rate with only a modest increase in the number of samples. The basic idea is to use two sets of uniform samples with slightly diffe... | 03/24/1992 |
| 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 |
| 4996532 | Digital beam forming radar system A radar system having improved interference resistance. A transmitting section includes an oscillator capable of switching the oscillation frequency, and a transmitting antenna connected to said oscillator and capable of transmitting electric waves having... | 02/26/1991 |
| 4358766 | Jamming signal reduction system Improved radar system performance in a jamming environment is achieved by making a complete frequency analysis of the jamming power entering the radar receiver during each range sweep (once per transmitted pulse) and then setting the frequency of the next... | 11/09/1982 |
| 4328497 | Method and system for jamming analysis and transmission selection A jamming analysis and transmission selection system for a radar wherein the frequencies present in the environment are sampled during a discrete time interval following each radar transmission; and utilizes a surface acoustic wave device having a plurali... | 05/04/1982 |
| 4135189 | Random frequency radar system 1. A variable frequency pulse radar system comprising: A transmitter, a receiver and means for initiating successive radar transmission-reception cycles at successive frequencies; listening means for picking up, while one of said radar cycles is running at a g... | 01/16/1979 |
| 3992709 | Doppler radar A Doppler radar for use in a vehicle for predicting a collision with another vehicle, capable of detecting noise due to a false wave i.e., the transmitted wave from another vehicle having a frequency in the vicinity of the true transmitted wave frequency ... | 11/16/1976 |
| 3981012 | Random frequency radar systems 1. A random frequency radar system comprising: a normally blocked transmitting channel including a radio frequency oscillator; a receiving channel including a mixer and a local oscillator feeding said mixer; means for selecting a random pair of associated... | 09/14/1976 |
