Abstract:
A system for detecting a target, the system comprises a transceiver and a signal processor; wherein the transceiver that is configured to: transmit a first pulse train that comprises multiple radio frequency (RF) pulses of a first non-linear polarity; receive first echoes resulting from the transmission of the first pulse train; generate first detection signals that represent the first echoes; and wherein the signal processor is configured to process the first detection signals to provide an estimated polarization orientation of a target; wherein the processing of the first detection signals comprises estimating a Jonas matrix of the target.
Abstract:
A radar level gauge system for determining a filling level in a tank. The radar level gauge system comprises a transceiver, a horn antenna having a first opening connected to the transceiver and a second opening facing a surface of the product in the tank, and processing circuitry connected to the transceiver for determining the filling level based on an electromagnetic surface reflection signal. The horn antenna is configured in such a way that an electrical distance from the first opening to the second opening, along a path defined by an intersection between a wall of the horn antenna and a half-plane starting from and extending in parallel with a cone axis of the horn antenna, is different for different orientations of the half-plane with respect to the cone axis. Hereby, disturbance from an antenna reflection signal can be reduced, which provides for improved measurement of high filling levels.
Abstract:
A scanning system uses synthetic aperture radar and photography. The system is capable of conjoint use of image data developed by these and other scanning apparatus to form a model of a zone. In some versions, the model includes subsurface image information. Methods for use to scan and for implementation of images and models developed by the scan are also disclosed.
Abstract:
In one embodiment of a positioning system, a transmit element is configured to transmit at least one electromagnetic pulse having a carrier signal frequency. An antenna array with a plurality of receive elements includes at least two receive elements separated by a spacing more than a half wavelength. Each of the at least two receive elements is configured to receive a return signal over a period of time. The return signal includes a return pulse from an object within a detection area of the system. The wavelength corresponds to the carrier signal frequency of the transmitted pulse. A detector is configured to process the return signal from one receive element and the other receive element so as to isolate the return pulse received at each of the at least two receive elements and thereby determine a position of the object in relation to the system.
Abstract:
A microwave transponder for automatic identification systems using back scatter technology, where two parallel and concentric patch antennas with an intermediate earth plane are used to achieve good sensitivity from both sides.
Abstract:
A field effect transistor FMCW radar transceiver for short-range target detection, employs a varactor-tuned, gallium arsenide field effect transistor, voltage-controlled oscillator in the dual role of the transmitter signal source and the local oscillator. The radar transceiver is capable of operating at low IF frequencies for short range, which can be less than 30 feet, target detection.
Abstract:
An adaptive radar apparatus (10) for substantially reducing background clutter, particularly relatively time-invariant clutter, such as sea clutter, and especially at low radar grazing angles. The apparatus (10) includes a transmitting antenna (12) having horizontally and vertically oriented, transmitting elements (26, 28) and a relative phase control therebetween and a receiving antenna (14) also with horizontally and vertically oriented receiving elements (30, 32) also having relative phase detection and phase shift possible therebetween. A controllable radar signal generator (16) is provided for supplying signals to the transmitting antenna (12) and a controllable signal processor (18) is provided for processing return signals from the receiving antenna (14). Means (20) are included for determining, from return test signals, a background mean null polarization for a number of radar range and azimuth cells and for providing null polarization control signals Ho, Vo and oo, to the signal generator (16) and return signal processor (18) to cause the radar to operate at a polarization state which is the same as the clutter mean null polarization. A corresponding method is provided for reducing background clutter, especially relatively time-invariant sea clutter, in low grazing angle radar.
Abstract:
A radar antenna, comprises a radar source configured to transmit a radar signal having a first polarisation in a transmission direction, a transformer having at least three layers spaced apart along the transmission direction, each of the at least three layers comprising an electrically conductive structure such to transform the radar signal into a radar signal having a second polarisation, such as from a linear polarized radar signal into a circular or vertical polarized radar signal and a substantially radar signal transparent climate shell arranged on the transformer. An outermost layer of the at least three layers adjacent to the climate shell is configured for electrically heating the climate shell. Figure 1
Abstract:
Radarsensor (10) für Kraftfahrzeuge, mit einer Sendeantenne (14) und einer getrennt von der Sendeantenne (14) ausgebildeten Empfangsantenne (16), dadurch gekennzeichnet, dass die Sendeantenne (14) zur Emission von in einer ersten Richtung zirkulär polarisierter Strahlung konfiguriert ist und die Empfangsantenne (16) zum Empfang von Strahlung konfiguriert ist, die in einer der ersten Richtung entgegengesetzten zweiten Richtung zirkulär polarisiert ist.
Abstract:
Die vorliegende Erfindung betrifft ein polarimetrisches Radar bestehend aus einer Sendeanordnung, die zirkular polarisierte Wellen über Sendeantennen abstrahlt, und einer Empfängeranordnung, die die reflektierten zirkular polarisierten Wellenanteile über eine Antennenanordnung empfängt, wobei mehrere Zweikanalempfänger als Empfängeranordnung vorgesehen sind, die gleichzeitig links-und rechtsdrehende, zirkular polarisierte Signalanteile empfangen, die für eine der Antennenanordnung nachgeschaltete digitale Strahlformung vorgesehenen sind, sowie ein Verfahren zur Objektklassifikation.