Beamforming concepts for angular measurements in azimuth and elevation with 77 GHz lens based radar sensors

2014 15th International Radar Symposium (IRS)

Ellenrieder

Walter

et al. 2014

Self Cite

In the last decade radar based driver assistance systems have increased the safety in all vehicle classes and get the access to mass market applications. Currently slow FMCW waveforms are the state of the art principle for automotive radar sensors at 24 GHz and 77 GHz. This contribution presents an innovative 77 GHz multi channel radar sensor, with the capability for fast FMCW PLL locked chirp modulations down to 10 µs. It gives a brief review on short FMCW chirp modulations and its processing. Furthermore the application of compressed sensing algorithms for r/v estimation is discussed and system simulations and measurements are presented.

Section: System Conceptmentioning

confidence: 99%

On fast chirp modulations and compressed sensing for automotive radar applications

2014 15th International Radar Symposium (IRS)

Ellenrieder

Walter

et al. 2014

Self Cite

“…The antenna concept shown in Fig. 4 enables angular estimation in azimuth and elevation and was published in detail in [13]. The basic principle is the usage of phase information in one angular plane, and amplitude information in the other angular plane.…”

Section: System Conceptmentioning

confidence: 99%

“…Figure 5 shows a fullwave simulation of the near-field behavior of the lens used in the system at 77 GHz [15]. The feed antenna elements are placed in the center of the focal region.…”

Section: System Conceptmentioning

confidence: 99%

“…In the beam overlap area, an angular estimation can be obtained using amplitude comparison and correlation methods. The adjustment of the squinted beams can be easily obtained due to a displacement of the feeding elements from the focus of the lens [15]. The second important parameter of interest is the beamwidth of the antenna system.…”

Section: System Conceptmentioning

confidence: 99%

“…The second important parameter of interest is the beamwidth of the antenna system. Due to the diffraction the broadening of the beam is defined as: where θ is the angle of the first intensity minimum, λ is the wavelength, and d a is the aperture size of the lens [9, 15].…”

Section: System Conceptmentioning

confidence: 99%

See 2 more Smart Citations

Lens-based 77 GHZ MIMO radar for angular estimation in multitarget environments

Int. J. Microw. Wireless Technol.

Walter

Weigel

2014

Self Cite

The demanding tasks for automotive radar systems in multitarget scenarios require an increased target separation performance and new sensor concepts. In this contribution, a highly integrated 77 GHz time domain multiplex (TDM) MIMO radar is presented. The sensor is feasible for advanced direction of arrival (DOA) estimation in azimuth and elevation. For efficient and high-quality measurements a fractional-n phased locked loop (PLL) with integrated waveform generator, enabling chirp and frequency modulated continous waveform (FMCW) modulations, is implemented. Spatial beamforming is done with series feed array patch antennas in combination with a dielectric cylindrical lens. For the improvement of the direction of arrival (DOA) estimation performance a new lens-based MIMO radar approach is introduced. Therefore the classical MIMO approach is combined with the advantages of an optical beamforming concept. Due to the usage of these techniques the sensor performance in accuracy, ambiguity suppression, and angular resolution can be significantly increased.

Angular measurements in azimuth and elevation with 77 GHz radar sensors

Baur

Mayer

Int. j. microw. wirel. technol.

et al. 2013

Self Cite

An antenna concept for direction of arrival estimation in azimuth and elevation is proposed for 77 GHz automotive radar sensors. This concept uses the amplitude information of the radar signal for the azimuth angle and the phase information for the elevation angle. The antenna consists of a combination of a series-fed-array structure with a cylindrical dielectric lens. This concept is implemented into a radar sensor based on SiGe MMICs for validation. A two- and a four-beam configuration are presented and discussed with respect to angular accuracy and ambiguities.