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An active quasi-circulator (QC) for transmit (TX) and receive (RX) signal separation in monostatic FMCW 77-GHz radar transceivers is presented with special emphasis on linear behavior in the TX-path. To increase the compression point in the TX-path, the conventional structure of an active QC circuit is modified. A transformer is used to transfer the transmit power to the antenna, which performs DC...
This paper describes the possibilities of automotive series production short range radar sensors in a vehicle environment for Highly Automated Driving. Four 24GHz sensors in our test vehicle provide measurements for an occupancy grid based environmental perception approach. Two example scenarios show the usage of the short range radar data for landmark detection and for free space estimation in construction...
In this paper we analyze the cancellation of the interference caused by a Intelligent Transportation Systems (ITS) on devices operating in the Dedicated Short Range Communications (DSRC) framework. The cancellation is operated by an interference canceller based on the active feed-forward architecture. The canceller is designed to operate over the frequency band 5.2 GHz – 6.4 GHz, hence it is suitable...
In the last few years automotive radar has been transformed from being a niche sensor to becoming standard even in middle-class cars. With Euro-NCAP ratings now requiring automated braking and pedestrian safety functionality, radar is often identified as the best suited sensor for this purpose. Additionally, future automated driving will require detailed and highly reliable information on the environment...
High-accuracy measurement systems are in high demand for industrial applications. Especially in machine tools, range measurement options close to the stage position are required. The main challenge of the measurement technique is the integration into the machine tool concept. In this paper, a novel measurement principle based on radar and on guided waves is presented for these applications, to achieve...
Cooperative Radar Sensor Systems operate several radar sensors with independent generation in a distributed network. Evaluating the cross-echo distances (bistatic responses), additional information about the target’s contour can be gained, as the locations of further reflection points of the target can be estimated. In this paper, a system model with several singlechannel stations is introduced, which...
Radar is an essential element of state of the art advanced driver assistance systems. In the foreseeable future, radar will be an indispensable sensor for the use in affordable, automated driven cars. Simulation tools are the key for an efficient development process and hence will lower the price of sophisticated driver assistance systems. Therefore, the development of adequate simulators is important...
Given the complexity of a radar system with Digital Beamforming a number of error influences can appear due to hardware non-idealities, temperature drift and aging. These errors can result in a reduced target detection probability or even lead to false detections. According to their appearance in the presented radar system their effects are analyzed with respect to the angular spectrum estimation...
In this paper, a CPW-fed dual band antenna for Circular Polarization (CP) is proposed and fabricated. CP is achieved using an 'L' shaped radiating patch and a one corner truncated slot in the ground plane. Dual band CP is achieved by connecting one end of the 'L' shaped patch to the ground plane and adding a stub to the ground plane. The proposed antenna has impedance bandwidths (S11 <-10 dB) of...
In this paper the evolution of silicon based automotive radar for the 76-81 GHz range is described. Starting with SiGe bare-die chips in 2009, today packaged MMICs are available for low-cost radar applications. Future SiGe BiCMOS technology will enable highly integrated single chip radars with superior performance at lower power consumption. This will pave the way for automotive radar safety for everyone...
In this paper a method for interference detection and cancellation for automotive radar systems is proposed. With the growing amount of vehicles equipped with radar sensors, interference mitigation techniques are getting more and more important to maintain good interoperability. Based on the time domain signal of a 76 GHz chirp sequence radar the interfering signals of FMCW radar sensors are identified...
In this paper, a new millimeter-wave transmit/receive antenna module for radar sensors was proposed. This antenna was designed operating at 24 GHz and intended for obstacle detection and short-range automotive applications. The transmitting part was implemented by a microstrip array antenna with 48-elements and improved with the concern of nonhomogeneous weights for amplitudes excitation. The receiving...
Cooperative Intelligent Transport Systems (C-ITS) enable the communication between vehicles, roadside infrastructure and traffic control centers. Except of the radio link between the vehicles and between vehicles and roadside infrastructure the system specifications are not finalized now. In this paper the C-ITS concept in context of the European Cooperative ITS corridor is described. The focus is...
The availability of high-resolution image radars allows estimating the orientation of vehicles from a single measurement without temporal filtering. This gives the opportunity to react even faster to certain critical traffic scenes. This paper presents an approach for estimating the orientation of a vehicle. The orientated bounding box algorithm known from literature is adapted to this end and a quality...
This paper describes a localization method for an IR-UWB (Impulse Radio Ultra Wideband) two-way ranging system developed for precise time-of-arrival measurements. The ranging system provides a time resolution of 275 ps, which allows precise indoor distance estimation with the accuracy of 4 cm. In this work, a two-way ranging algorithm has been extended into a localization algorithm without the need...
In order to release the increasing pressure of traffic flow in metropolises, this paper introduced a method of using high sensitivity microwave radiometric systems to monitor the traffic flow in all-weather conditions. In this method, radiometers were employed to detect and recognize the automobiles on the roads based on different behaviors of the automobile roofs and road surface in the millimeter...
Automotive radar interference is an issue arising with the increasing amount of radar systems in automotive scenarios. Interference can influence the functionality of a radar system, e.g. decrease its detection capability. To ensure functionality in critical situations, interference countermeasures are applied. This paper proposes a countermeasure for chirp sequence modulated radars interfering one...
Due to advances in the field of robotics, service robots have been rapidly gaining popularity over the past 20 years. However, the crucial aspect of indoor mobile-robot localization has remained relatively unexplored. This paper presents a bilateral 24 GHz wireless positioning system with minimum infrastructure for 3D real-time localization of people and mobile robots for indoor service-robot applications...
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