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| Number | Title | Issue Date |
| 5173701 | Radar apparatus with jamming indicator and receiver device with jamming indicator A radar apparatus is provided with a jamming indicator (11), the jamming indicator (11) having the same bandwidth as the preselector filter (15) of the radar receiver (5).... | 12/22/1992 |
| 5162805 | Frequency diversity sidelobe canceller A new system and technique for cancelling interference in frequency agile ceiving systems. Main and auxiliary signals are supplied to a pair of multiple loop side-lobe cancellers which are capable of being tuned to different frequencies. At the same time,... | 11/10/1992 |
| 5101209 | Jam strobe resolution using a monopulse antenna In a surveillance radar, a process is disclosed which can determine the angular positions of multiple jammers with the use of a monopulse agile beam antenna. It involves collecting and processing jammer data received via a monopulse antenna, in order to d... | 03/31/1992 |
| 5075864 | Speed and direction sensing apparatus for a vehicle An apparatus is provided for determining the velocity and orientation of a vehicle, for instance to permit route guidance by dead reckoning. Two optical speed over ground sensors on the vehicle are arranged at acute angles to the longitudinal axis of the ... | 12/24/1991 |
| 5008677 | Anti-jamming device for a radar provided with a reflector antenna A reflector of an antenna in a radar system subject to jamming carries a multiplicity of localized phase shifters which are sequentially controlled by a processor to introduce certain phase modifications into incoming signals reflected toward an associate... | 04/16/1991 |
| 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 |
| 4959653 | Adaptive sidelobe blanker An adaptive sidelobe blanker uses the covariance matrix used to form an adaptively nulled main channel to generate an adaptively nulled version of an omnidirectional antenna pattern. Individual antenna control includes sampling, digitizing, and storage of... | 09/25/1990 |
| 4935743 | Anti-jamming apparatus and method for a radar system Anti-jamming apparatus and method for a radar system having a main antenna utilizes a single electronic-scan auxiliary antenna having a plurality of radiating elements each coupled to appropriate phase shift means. The auxiliary antenna is successively si... | 06/19/1990 |
| 4891647 | Method and a device for reducing the power of jamming signals received by the secondary lobes of a random frequency radar antenna A method and a device for reducing the power of jamming signals received by the secondary lobes of the main antenna AP of a radar transmitting at a random frequency fE (n), with which is associated a number of secondary antennas ASl, . . . ASN.... | 01/02/1990 |
| 4870424 | Method and apparatus for reducing unwanted r.f. signal antenna reception/transmission A method and apparatus is disclosed for selectively modulating r.f. signals received/transmitted via the radiation pattern side lobes of an r.f. antenna structure. Such modulation permits discrimination between desired r.f. signal energy received via the ... | 09/26/1989 |
| 4851847 | Method for eliminating self-screening noise jamming in radar systems A method for eliminating self-screening noise jamming from the main beam of a radar in order to reveal the skin echoes of aircraft at the same angle, including the aircraft carrying the jammer by using a main antenna and an auxiliary antenna located a sho... | 07/25/1989 |
| 4757265 | Adaptive eccm signal processor An adaptive nonlinear processor in which the desired radar signal together with an interfering signal is mixing with a voltage controlled oscillator and fed to a dispersive filter, the output thereof being detected and converted into gating pulses for ena... | 07/12/1988 |
| 4698632 | Radar detector A radar detector capable of discriminating a prescribed radar signal from other undesired radar or interference signals by mixing an incoming electromagnetic wave radar signal with a local signal whose frequency varies with time within a fixed range of fr... | 10/06/1987 |
| 4688041 | Baseband detector with anti-jam capability A method and apparatus for detecting a short pulse signal in the presence of an interfering jamming signal wherein the jamming signal is utilized as the local oscillator in a diode mixer when it is received at a sufficiently high level for efficiently mix... | 08/18/1987 |
| 4672378 | Method and apparatus for reducing the power of jamming signals received by radar antenna sidelobes Secondary lobe cancellation (SLC) is used to reduce the power of jamming signals received by the sidelobes of a main radar antenna. The signal from the radiation pattern of the main antenna is summed with signals from auxiliary radiation patterns. Each au... | 06/09/1987 |
| 4628320 | Cancellation of scatter jamming In side-lobe cancelling equipment direct jammer signals appearing in an auxiliary antenna channel are better correlated with reflected jammer signals in a main antenna channel by splitting the signal in the auxiliary channel into two parts, one of which i... | 12/09/1986 |
| 4586048 | Sidelobe canceller An intermediate frequency sidelobe canceller having two cancellation points, one delayed with respect to the other. By utilizing the control signal generated by the loop associated with the undelayed cancellation point to control the cancelling signal at ... | 04/29/1986 |
| 4586045 | Wide band multiple side-lobe canceller An IF side-lobe canceller having a main channel and a pair of auxiliary channels in which the signal from the main channel is mixed with a stable local oscillator and fed to a subtractor, while in each of the pair of auxiliary channels the signal from an ... | 04/29/1986 |
| 4573051 | Adaptive system for suppressing interferences from directional jammers in electronically or mechanically scanning radar A radar antenna with a collector of microwave energy incident along the main lobe of its radiation pattern, feeding a processor whose principal channel generates a raw output signal, is provided within the effective area of that collector with one or more... | 02/25/1986 |
| 4549183 | Interference suppressor for an electronically or mechanically scanning monopulse radar generating sum and difference signals from received microwave energy An electronically or mechanically scanning monopulse radar has an antenna feeding incident microwave energy contaminated by jamming signal to a processor which has a sum channel and one or two difference channels generating a raw sum signal Σ along with ... | 10/22/1985 |
| 4388723 | Control device for steerable null antenna processor A radio receiving system partially overcomes jamming and other interference y receiving on a narrow selected frequency which is rapidly changed, i.e., fast frequency hopping (FFH). The system includes a broadband receiving antenna array and a steerable nul... | 06/14/1983 |
| 4369445 | Automatic ECM video processor A video processor that responds to the video signals received from a group of radar receivers to automatically select the video that is least affected by ECM environment in which the receivers operate. Each receiver in the group has known ECM characterist... | 01/18/1983 |
| 4241889 | Method for increasing the hit probability of jammed missiles and device for carrying out the method A method and device is disclosed for increasing the hit probability of guided missiles exposed to jamming by double or multiple targets. In particular, the missiles are guided by the proportional navigation principle and have a follow-up target-seeking he... | 12/30/1980 |
| 4215344 | Multiple channel electronic countermeasures radar receiver 1. A multiple channel electronic countermeasures radar receiving system comprising: source means for supplying periodic echo pulses beat to the intermediate frequency of the system and combined with jamming noise of variable frequency distribution, first ... | 07/29/1980 |
| 4214244 | Null pattern technique for reduction of an undesirable interfering signal A null pattern technique for reducing the effect of an undesired interfering signal in a data link channel, using an accepted monopulse tracking arrangement in a novel mode, such that the source of such interfering signal can be caused to be placed at the... | 07/22/1980 |
| 4190837 | System for protecting a vehicle-borne tracking radar against an off-target jammer A protective system for a vehicle-borne tracking radar, designed to counter the effect of an off-target jammer whose interfering signals are picked up by a directive antenna together with echoes from an actual target, comprises a receiver with a sum chann... | 02/26/1980 |
| 4170009 | Multiple channel electronic countermeasures receiver system 1. A multiple channel electronic countermeasures radar receiving system comprising: An input to which periodic echo pulses beat to the intermediate frequency of the system and combined with random noise energy is applied; Limiting receiver means including in t... | 10/02/1979 |
| 4107682 | System for overcoming the effect of electronic countermeasures An electronic counter counter-measure (ECCM) system for overcoming the effect of sidelobe repeater or stand off jammer type electronic counter measures (ECM). A primary monopulse type antenna is divided into four quadrants for transmission and reception w... | 08/15/1978 |
| 4075633 | Space adaptive coherent sidelobe canceller An improved interference cancelling system and technique for optimizing sal sampling, particularly in a side-lobe canceller system operating in a multiple signal environment. A plurality of auxiliary antennas provide samples of the interference environme... | 02/21/1978 |
| 4063239 | Range or doppler gate deception rejection system A doppler radar wherein the range signal is differentiated to obtain a range rate of change and a velocity signal is obtained from the doppler frequency shift of signals returned from a target, and wherein the range rate and velocity signals are compared ... | 12/13/1977 |
| 4044359 | Multiple intermediate frequency side-lobe canceller 1. In an undesired signal canceller, a main signal transmission channel having an output terminal, a plurality of auxiliary signal transmission channels having output terminals, means for cross coupling each of said auxiliary channels separately to said m... | 08/23/1977 |
| 4015261 | Time sharing circuit for guard radar receiver in radar ranging system 1. A time sharing circuit for a multiple pulse repetition frequency, pulsoppler target bearing and ranging radar having dual antenna horns with a receiver and a plurality of range channels coupled in a receiver channel from each antenna horn to a data pr... | 03/29/1977 |
| 3950751 | CW Interference canceller (CWIC) An antijam device for use in radar and missile guidance systems which tra a doppler-shifted CW target echo by means of an automatic frequency control loop. Means are placed between the doppler filter and error detector portion of the automatic frequency ... | 04/13/1976 |
| 3949309 | Non-linear processor for anti-jam operation A non-linear signal processor reduces or eliminates the effects of a contous wave jamming frequency in a communication signal. Mixing, filtering, and summing operations are used to isolate and eliminate the jamming frequency.... | 04/06/1976 |
| 3943515 | Counter-countermeasure guidance system 4. A method of avoiding countermeasure jamming techniques comprising the ps of: Transmitting a signal over at least a pair of carrier waves which differ in frequency by a predetermined amount and Receiving and beating the carrier waves one against the other t... | 03/09/1976 |
