Abstract:
With the present invention, there is provided an image generation method for displaying images to users according to the data received from at least one radar. Said method comprises the steps of forming a plurality of scan regions by dividing a region that is to be scanned by the radar into azimuth and range lines such that each of the scan regions remains between at least two azimuth lines and two range lines; dividing each scan region into at least two sub-regions; receiving scanning data related to each scan region from said radar; determining the number of sensing point (3) in each sub-region according to the received scanning data; establishing a threshold value for each scan region according to the numbers of the sensing point (3) that form the scan region; for each sub-region, comparing the number of sensing point (3) in the corresponding sub-region with the threshold value of the scan region where the sub-region is located; if the number of sensing point (3) in a sub-region is higher than the threshold value of the scan region where the sub-region is located, then determining that the sensing points (3) in the concerned sub-region belong to a target (4); displaying to a user on a screen the sensing points (3) which are determined to belong to the target (4); if the number of sensing points (3) in a sub-region is lower than the threshold value of the scan region where the sub- region is located, then determining that the sensing points (3) in the concerned sub-region are caused by a clutter; if a new scanning data with respect to each scan region is received from the radar, repeating the steps of establishing a threshold value, comparing the number of sensing point (3) in the sub-region with the threshold value, determining that the sensing points (3) in the sub-region belongs to a target (4) and displaying to a user on a screen the sensing points (3) which are determined to belong to the target (4), and determining that the sensing points (3) in the sub-region are caused by a clutter.
Abstract:
According to various embodiments, systems and methods for through imaging a medium are disclosed. An apparatus can include one or more radiating elements comprising one or more artificially-structured materials. The one or more radiating elements can be configured to transmit a radiation pattern of electromagnetic energy into a medium. The apparatus also can include one or more receiving elements configured to receive backscattered energy from the radiation pattern of electromagnetic energy transmitted into the medium. The backscattered energy received by the one or more receiving elements can be used to generate one or more through images of the medium.
Abstract:
A radio frequency (RF) imaging device comprises an RF sensor assembly, a position sensor, a processor, and a memory. The RF sensor assembly receives an RF signal for capturing an RF image of a portion of a space behind a surface. The position sensor receives a plurality of signals respectively emitted by a plurality of position markers at known positions relative to the surface. The processor determines a plurality of angles at which the plurality of signals respectively arrive at the position sensor and determines, based on the plurality of angles and the known positions of the plurality of position markers, a position of the RF imaging device relative to the surface. The memory stores the RF image in association with the determined position of the RF imaging device. A time-of-flight or triangulation of signal data may be used for position determination.
Abstract:
L'invention concerne un procédé d'estimation spectrale du fouillis d'un milieu liquide halin reçu par un radar océanographique, tel qu'un lac, un fleuve, une mer ou un océan, à partir d'un réseau d'antennes comportant au moins trois antennes. Il comporte les étapes suivantes : - une première étape (101) de formation d'au moins deux sous-réseaux d'antennes à partir du réseau d'antennes, chacun des sous-réseaux comportant au moins une antenne de moins que le réseau d'antennes; - une deuxième étape (102) de calcul d'un faisceau dans une direction pour chaque sous réseau d'antenne; - une troisième étape (103) de localisation en azimut de toutes sources comprise dans le faisceau à partir des données du faisceau provenant de chacun des sous-réseaux; - une quatrième étape (104) d'estimation de l'énergie de chacune des sources localisées; - une cinquième étape (105) de sélection d'une source, dite source préférée, parmi plusieurs sources selon un critère prédéterminé lorsque le faisceau comporte plusieurs sources.
Abstract:
The invention pertains to a system for determining a distance to an object comprising: a solid-state light source for projecting a pattern of discrete spots of laser light towards the object in a sequence of pulses; a detector comprising a plurality of picture elements, for detecting light representing the pattern of discrete spots as reflected by the object in synchronization with said pulses; and processing means to calculate the distance to the object as a function of exposure values generated by said picture elements. The picture elements are configured to generate exposure values by accumulating, for each pulse of said sequence, a first amount of electrical charge representative of a first amount of light reflected by said object during a first time window and a second electrical charge representative of a second amount of light reflected by said object during a second time window, said second time window occurring after said first time window.
Abstract:
A method of imaging within an absorptive object comprising: placing transmit and receive antennas in close proximity to a surface of said object; transmitting electromagnetic pulses from the transmit antenna into the object; and receiving a receive signal at the receive antenna simultaneously with the transmit antenna transmitting said pulses; wherein the transmitting and receiving comprises the following steps: a) setting a threshold level for the receive signal strength; b) transmitting one or more pulses; c) comparing the receive signal for said one or more pulses with the threshold level; d) changing the threshold level; e) repeating steps b), c) and optionally d) one or more times. This arrangement can operate at extremely high speed due to the absence of any slow multi-bit ADCs. Coupled radar applications require very high sampling rates and a high dynamic range is required if both the strong direct path signal and the weaker signal from depth are both to be received simultaneously. The use of a comparator as effectively a 1-bit ADC quantises the incoming signal into two levels; it can operate at high speed and thus provide the time resolution required for signal processing. The comparison threshold is adjustable, i.e. the quantisation level is adjustable. This provides the high dynamic range that makes coupled radar applications possible.
Abstract:
Methods and systems for improved positioning accuracy relative to a digital map are disclosed, and which are preferably used for highly and fully automated driving applications, and which may use localisation reference data associated with a digital map. A vehicle localization is obtained by comparing real time depth map acquired by a sensor associated to the vehicle to a depth map associated to a digital map. The depth maps are indicative of an environment around the vehicle. Longitudinal and lateral offsets of the vehicle with respect to the digital map are determined. The invention further extends to methods and systems for the generation of localisation reference data associated with a digital map.
Abstract:
A system for generating a three dimension (3D) imaging of an object, the system comprising: an electromagnetic transducer array such as an RF (radio- frequency) antenna array surrounding the object said array comprising: a plurality of electromagnetic transducers; a transmitter unit for applying RF signals to said electromagnetic transducer array; and a receiver unit for receiving a plurality of RF signals affected by said object from said electromagnetic transducers array; a Radio Frequency Signals Measurement Unit (RFSMU) configured to receive and measure said plurality of plurality of affected RF signals and provide RF data of the object; and at least one processing unit, configured to process said RF data to identify the dielectric properties of said object and construct a 3D image of said object.
Abstract:
This document describes techniques for radio frequency (RF) based micro-motion tracking. These techniques enable even millimeter-scale hand motions to be tracked. To do so, radar signals are used from radar systems that, with conventional techniques, would only permit resolutions of a centimeter or more.