Abstract:
A system (100) for providing integrated detection and countermeasures against unmanned aerial vehicles(44) include a detecting element (103), a location determining element (104) and an interdiction element (102). The detecting element detects an unmanned aerial vehicle in flight in the region of, or approaching, a property, place, event or very important person. The location determining element determines the exact location of the unmanned aerial vehicle. The interdiction element can either direct the unmanned aerial vehicle away from the property, place, event or very important person in a non-destructive manner, or can cause disable the unmanned aerial vehicle in a destructive manner.
Abstract:
A threat launch detection system includes at least one temporal threat detector, each temporal threat detector including a single sensing element operable to sense radiation from various types of short-burn threats that occur within a field of view of the detector. The single sensing element generates a detection signal in response to the sensed radiation. A processing circuit is coupled to each temporal threat detector and is operable to analyze the detection signal from each detector as a function of time to detect the occurrence of a short-burn threat within the field of view of any of the temporal threat detectors. Each temporal threat detector may be a prism-coupled compound parabolic concentrator (PCCP).
Abstract:
The transmitter of active barrage radio jamming, including case (1) with cone-shaped upper part (2) and cylindrical body (3), in which the following items are placed one under the other: accelerator (6), battery (8), electronic unit (9) (including noise generator (20), voltage controlled generator (24), power amplifier (25) and antenna matching unit (10), stabilizer (11) and cap (12). The electronic unit (5) is shaped as a complete module, including connected in series modulator (22), phase detector (23) and correction amplifier (21), as its output is connected to the input of voltage controlled generator (24), and the second outputs of the power amplifier (25) and the antenna tuning unit (10) are connected to the respective inputs of the phase detector (23) and a second modulator output (22) is connected to a second input of the antenna tuning unit (10). Along the whole length of the case (1) of the transmitter there is a cylindrical cavity (5) in which a telescopic antenna (6) is placed.
Abstract:
Die Erfindung betrifft eine mobile, auf Fahrzeugen anzubringende Störsenderantenne, umfassend ein Antennenarray mit mindestens zwei Antennen, wobei die Antennen des Antennenarrays als Rundstrahlantennen (A1 -A4;A5-A7) ausgebildet sind, wobei die Antennen (A1 -A4;A5-A7) des Arrays durch nicht-kohärente Signale, die keine feste Phasenbeziehung zueinander haben, gespeist werden, derart dass Nullstellen und Pegeleinbrüche im Antennendiagramm vermieden werden.
Abstract:
The feed for the subject receiver-on-chip is a 30 Mhz to 18 Mhz Rf input (42), which is coupled to an RF pre-select and attenuation or notch filter circuit (44), which is off-chip. The out put of this circuit is amplified by a low noise amplifier LNA (46) and is either switched between a low band pass filter (48) or mixer (50) is used in a single down conversion stage, with the mixer (50) being driven by either 8, 10 or 12 GHz local oscillators on line (52) from a clock and local oscillator (54).
Abstract:
A deceptive signature broadcast system for an aircraft or other emissions generating asset for generating an emissions pattern for masking the normal emissions signature of the aircraft or asset, and protecting it from emissions tracking intercept vehicles such as Infrared tracking missiles; the system includes at least two beacons mounted in a spaced apart arrangement orthogonal to the desired zone of protection, and bracketing the asset, such as on opposite wingtips of the aircraft for fore and aft protection; the beacon set is modulated from one end to the other with a sweeping pattern of emission intensity, deceptively indicating to the intercepting vehicle a lateral component of motion of the aircraft away from its true relative position within the intercept vehicle's field of view, thereby inducing the intercept vehicle to adopt an erroneous and exaggerated lead angle and course correction that results in a missed intercept trajectory.
Abstract:
A method is disclosed for effectively reducing the radar cross section for external irradiation of an antenna arrangement. The method is particularly applied to an array of radiating elements. It is not necessary to reduce scattering from each element of the array. Instead each element is arranged to scatter with a phase and amplitude such that the combined backscattering from the complete array in a particular direction is minimized. This particular direction is typically towards the external (threat) source. An antenna arrangement is demonstrated in which radar signals are received by an array lobe, while shaping a reduced scattering pattern having a null appearing in the external radar direction and a reduced scattering pattern for any external illumination by introduction of an impedance member in the feed line of a number of the array elements. According to the invention this impedance load may further be systematically varied according to the requirements of each particular situation.
Abstract:
Apparatus and method for multi-band, multi-frequency signal detection and transmission, comprising a multi-band wideband antenna, a receiver based on a plurality of synthesized down-converters and a plurality of synthesized programmable multi-channel phase-locked LOs, a DDS and a synthesized complex I/Q phase-detector, a control center based on a DSP connected with an ADC, plurality of DACs and an FPGA, and a plurality of synthesized programmable multi-channel transmitters synchronized with the DDS.
Abstract:
The present invention relates to a fibre optical system having gradually variable delay for range gate pull-off of radar echoes, which system comprises one or more devices (2a, 2b) for immediate or very quick connection of the signal to two or more parallel delay links. Further, it comprises said two or more parallel delay links, which consist of delay lines in the form of monomode fibres (5) in increasing lengths and electromecanically controlled switches (6) having very low optical attenuation, as is normally the case with such switches. Finally, there are one or more devices (3) for combining the outputs of the delay lines to a common output for the system.