An Automatic Gain and Offset Control Circuit for DC-Coupled Continuous-Wave Radar Systems

AbstractIn this contribution, a composite measurement concept for the gas flow determination in diverse stream scenarios is presented. The approach utilizes the pressure- and mixing-dependent relative permittivity of gaseous media, which, in case of a vortex or a marker gas, creates a detectable variation in the measuring beam of the radar. Since the measurement effect is very small, phase measurements based on highly precise and low jitter frequency-modulated continuous-wave radar systems in different frequency bands are applied. Moreover, disturbances caused by vibrations of the measurement setup are compensated out of the measurement signal.

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Automotive Frequency Modulated Continuous Wave Radar Interference Reduction Using Per-Vehicle Chirp Sequences

Sensors ◽

10.3390/s18092831 ◽

2018 ◽

Vol 18 (9) ◽

pp. 2831 ◽

Cited By ~ 7

Author(s):

Youn-Sik Son ◽

Hyuk-Kee Sung ◽

Seo Heo

Keyword(s):

Continuous Wave ◽

Signal Interference ◽

Radar Signal ◽

Driver Assistance ◽

Interference Reduction ◽

Fmcw Radar ◽

Radar Sensors ◽

Vehicle To Vehicle ◽

Radar Systems ◽

Wave Radar

Recently, many automobiles adopt radar sensors to support advanced driver assistance system (ADAS) functions. As the number of vehicles with radar systems increases the probability of radar signal interference and the accompanying ghost target problems become serious. In this paper, we propose a novel algorithm where we deploy per-vehicle chirp sequence in a frequency modulated continuous wave (FMCW) radar to mitigate the vehicle-to-vehicle radar interference. We devise a chirp sequence set so that the slope of each vehicle’s chirp sequence does not overlap within the set. By assigning one of the chirp sequences to each vehicle, we mitigate the interference from the radar signals transmitted by the neighboring vehicles. We confirm the performance of the proposed method stochastically by computer simulation. The simulation results show that the detection and false alarm performance is improved significantly by the proposed method.

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Low-Complexity 2D-MUSIC for Joint Range and Angle Estimation of Frequency Modulated Continuous-Wave Radar

Journal of Electromagnetic Engineering and Science ◽

10.26866/jees.2021.5.r.48 ◽

2021 ◽

Vol 21 (5) ◽

pp. 399-405

Author(s):

Yongchul Jung ◽

Seunghyeok Lee ◽

Seongjoo Lee ◽

Yunho Jung

Keyword(s):

Continuous Wave ◽

Low Complexity ◽

Processing Technique ◽

Angle Estimation ◽

Multiple Signal Classification ◽

Fmcw Radar ◽

Radar Systems ◽

Wave Radar ◽

Preprocessing Technique ◽

Joint Range

A pre-processing technique is proposed to reduce the complexity of two-dimensional multiple signal classification (2D-MUSIC) for the joint range and angle estimation of frequency-modulated continuous-wave (FMCW) radar systems. By using the central symmetry of the angle steering vector from a uniform linear array (ULA) antenna and the linearity of the beat signal in the FMCW radar, this preprocessing technique transforms 2D-MUSIC from complex values into real values. To compare the computational complexity of the proposed algorithm with the conventional 2D-MUSIC, we measured the CPU processing time for various numbers of snapshots, and the evaluation results indicated that the 2D-MUSIC with the proposed pre-processing technique is approximately three times faster than the conventional 2D-MUSIC.

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