12 research outputs found
Comparison of matching layers for automotive radome design
Hidden integration of 79 GHz sensors behind plastic and painted fascia
represents a challenging task since both electromagnetic and car body design
constraints have to be met. This paper compares different possibilities for
low-cost integration of radar sensors. Based on a model for stratified media,
a study of the most important parameters such as bandwidth, angle and
tolerances is shown. Our results suggest that for plastic fascia, the
requirements of future radar sensors can be met with low-cost matching. Even
with metallic paints, the requirements imposed by modern 79 GHz radar sensors
can be met under certain conditions
Pedestrian recognition using automotive radar sensors
The application of modern series production automotive radar sensors to
pedestrian recognition is an important topic in research on future driver
assistance systems. The aim of this paper is to understand the potential and
limits of such sensors in pedestrian recognition. This knowledge could be
used to develop next generation radar sensors with improved pedestrian
recognition capabilities. A new raw radar data signal processing algorithm is
proposed that allows deep insights into the object classification process.
The impact of raw radar data properties can be directly observed in every
layer of the classification system by avoiding machine learning and tracking.
This gives information on the limiting factors of raw radar data in terms of
classification decision making. To accomplish the very challenging
distinction between pedestrians and static objects, five significant and
stable object features from the spatial distribution and Doppler information
are found. Experimental results with data from a 77 GHz automotive radar
sensor show that over 95% of pedestrians can be classified correctly under
optimal conditions, which is compareable to modern machine learning systems.
The impact of the pedestrian's direction of movement, occlusion, antenna beam
elevation angle, linear vehicle movement, and other factors are investigated
and discussed. The results show that under real life conditions, radar only
based pedestrian recognition is limited due to insufficient Doppler frequency
and spatial resolution as well as antenna side lobe effects
Optimized tracking for cooperative sensor systems in multipath environments
In a cooperative sensor system for pedestrian protection, a pedestrian and other road users exchange data by means of radio frequency communication. In the proposed system, the pedestrian carries a transponder which is interrogated by a vehicle and sends an anonymous identification (ID) sequence. By decoding the ID, the interrogation unit in the vehicle detects the presence of the transponder. Evaluating the incident wave of the transponder's answer, a localisation is possible. <br><br> In the proposed localization system, the measurement results can be distorted by multipath propagation. Multipath errors result if signals of the same transponder arrive simultaneously at the receiver unit from different directions. In this case, erroneous distances and angles are measured. Because the signals arriving from different directions contain the same transponder ID, they can be assigned to their origin. One of the challenges in post-processing for signal improvement is enhancing the selection of the correct position information by making assumptions about the pedestrian's movement and by knowing the vehicle's current driving parameters. Additionally, information contained in multipath signals is used to form a better estimate for the true position of the transponder. To overcome the problems related to multipath propagation effects, a method is proposed that estimates the origin of a multipath signal and maps the distorted position information back to the true position. A fusion of tracked direct positions and mapped multipath signals leads to an improvement in positioning accuracy
Antennensystem, Sichtscheibe und Kraftfahrzeug
DE 102008027371 A1 UPAB: 20091216 NOVELTY - The antenna system (12) for a motor vehicle (10) includes a surface arrangement of flat antenna elements (16) on a dielectric carrier and an electrically conductive Faure plate (18) on the opposite surface to the carrier. The dielectric carrier is in the form of one or more layers of the laminar windscreen (14) of the vehicle. There is an arrangement of several holes in the Faure plate. USE - For a motor vehicle. ADVANTAGE - Enables advantages of planar or micro-strip antenna to be applicable to a motor vehicle