Wilhelm Grabow

Adaptive array antennas for 5.8 GHz vehicle to roadside communication

In this paper a new concept for future short range vehicle to roadside communication systems at 5.8 GHz with electronically controlled array antennas is presented. The main beam of each antenna system is directed to fixed contours in the communication zone according to the vehicles position. Interfering signals from vehicles on adjacent lanes are suppressed with an adaptive sidelobe reduction algorithm. Results for an automatic fee collection system show the efficiency of the adaptive array concept.<<ETX>>

Interoperable 5.8 GHz DSRC Systems as Basis for Europeanwide ETC Implementation

This paper studies the requirements of Electronic Toll Collection systems in regard to their demand for interoperable 5.8 GHZ Dedicated Short Range Communication (DSRC) systems. It first gives an overview of DSRC standardization. It then describes the technical concepts of the physical layer of 5.8 GHz DSRC, and gives examples of roadside and vehicle equipment and advanced solutions for future multilane electronic toll collection systems.

A Mobile Antenna for the Digital Satellite Radio (DSR)

An adaptive antenna for mobile reception of the digital satellite radio (DSR) is presented. The antenna system is developed for the 12 GHz frequency range and left-hand circular polarization. It consists of four planar arrays, each with 8×32 microstrip patches. The design of the antenna considers the special problems inherent in the mobile reception of direct broadcasting satellites in Germany. With the main beam steerable in a full azimuth range of 360° and an elevation range of 150° - 37° the antenna meets the required specifications. 4-bit phase shifters are used to control the main beam in azimuth and 1-bit phase shifters are sufficient for the elevation range. The applied adaptation method needs only input information, which can easily be provided by the receiver. First tests on the mobile reception of the DSR signals via TV-SAT2 have shown good performance.

Access control system based on the emerging European standard for 5.8 GHz short range communication

Standardized and compatible 5.8 GHz communication equipment is now under development by several electronic suppliers and will be available on the market soon. In addition to electronic toll collection special access control systems, using the same technology, will appear. In summary, two main constraints had to be solved. First, to be compliant to the more pretentious technical specifications according to CEN TC 278 compared with the former 5.8 GHz systems. Second, to reduce the production costs essentially. Our result is an integrated antenna/transceiver unit installed in a conventional traffic light housing.