摘要:
Driving assistance device for a motor vehicle, including at least one emitter of radiation toward the front of the vehicle, a receiver of part of this radiation reflected by a target vehicle, and control and calculation means for influencing the acceleration and braking of the following vehicle in accordance with information coming from the unit comprising the emitter and the receiver and in accordance with data pertaining to the following vehicle. At least the emitter is mounted so as to be rotatable in terms of the azimuth and means for driving the emitter in rotation are provided in order to modify the azimuth of the beam of the emitter in accordance with the curvature of the road. This beam advantageously turns by the same angle as that of the beam of an adaptive lighting system.
摘要:
A variable scattering device comprising a object which may be an antenna, a load impedance which is optimal and a switch which connects the scattering object to the load impedance. By using the switch to switch the load impedance in and out of the connection with the scattering object a large dynamic range for a fluctuating scattered signal may be achieved.
摘要:
The invention is a radar decoy which electronically simulates objects by generating radar detectable signals over the entire microwave frequency range. The simulator includes a series of tuned, spaced diode networks for generating carrier suppressed doppler side bands. Each diode network operates at a single, different frequency. The diode networks are enclosed by a corner reflector which modulates the amplitude and the phase of an impinging radar signal. The diode networks are controlled by a switching network which turns the diodes on and off at a desire frequency to produce a doppler frequency shift and thereby simulate moving objects.
摘要:
An emergency passive radar locating device for use by missing persons or craft to enhance their survivability in a search and rescue operation. The emergency passive radar locating device comprises an array of eight radar corner reflectors. Each corner reflector of the emergency passive radar locating device has three radar signal reflective surfaces which are mutually perpendicular. When fully inflated the emergency passive radar locating device is spherical in shape with three mutually perpendicular toroidal flotation rings.
摘要:
There is provided a radar reflector apparatus that is mounted in a lifeboat or a small rescue boat or in a floating buoy used for salvage or search practice, or is used by itself independently, to serve as a radar wave reflector of a search radar. The radar reflector apparatus has a simple structure, and is folded when not in use, and when used, is unfolded automatically when dropped by a marine vessel or aircraft or the like.
摘要:
A reflector circuit is provided which responds to illuminating radiation with corresponding output radiation of increased magnitude relative to the illuminating radiation, while also providing a frequency selective limiting characteristic. The circuit comprises an antenna for receiving the illuminating radiation and emitting the corresponding output radiation, a delay line providing a frequency selective limiting and signal storage characteristic and an amplifier assembly. The antenna provides an input signal upon receipt of the illuminating radiation, a portion of which is amplified, frequency selectively filtered and then stored for a period after which it is emitted as the output radiation from the circuit. Switches are incorporated and are operable to counteract spontaneous oscillation within the circuit.
摘要:
The invention provides an artificial magnetic conductor (AMC) system and method for manufacturing. The AMC has a post plane with posts and slots. The posts are operatively disposed adjacent to conductive shapes on one or more frequency selective surfaces. The posts formably extend from the post plane.
摘要:
A frequency selective surface includes at least one frequency selective layer (1) made up of an array of electrically conductive elements (2, 2a, 2b), at least one frequency selective layer (3) having an array of non-conductive apertures (4) therethrough overlaying the element layer (1) and a dielectric layer separating the two layers (1, 3). The element layer (1) is complementary in plan view to the aperture layer (3). The element layer (1) and the aperture layer (3) are rotated through 90 degrees in plan with respect to each other and substantially parallel to one another and the element array and the aperture array have the same periodicity.