Coded 24 GHz Doppler radar sensors: a new approach to high-precision vehicle position and ground-speed sensing in railway and automobile applications

2002 ◽  
Author(s):  
P. Heide ◽  
V. Magori ◽  
R. Schwarte
Keyword(s):  
High Precision ◽  
Doppler Radar ◽  
New Approach ◽  
Ground Speed ◽  
Radar Sensors ◽  
Vehicle Position ◽  
24 Ghz

scholarly journals Multi-frequency sensor for remote measurement of breath and heartbeat

2006 ◽  
Vol 4 ◽  
pp. 79-83 ◽  
Author(s):  
M. Jelen ◽  
E. M. Biebl
Keyword(s):  
Doppler Radar ◽  
Low Cost ◽  
Remote Measurement ◽  
Range Resolution ◽  
Radar Sensors ◽  
Pulse Radar ◽  
Radar Systems ◽  
Frequency Sensor ◽  
24 Ghz

Abstract. Remote measurement of breath and heartbeat is desirable in many situations. It avoids the discomfort resulting from electrodes applied on the skin for long-term patients or during sports acvtivities. Also, surveillance of high security areas or finding survivors of disasters are interesting applications. Common methods identify the movement of heart and thorax by using the range resolution provided by UWB pulse radar systems. In this paper a low-cost approach is presented, that is based on detection of movement by means of Doppler radar sensors. Combining three sensors working in the ISM bands at 433 MHz, 2.4 GHz and 24 GHz, the presence of persons was reliably detected and the frequency of breath and heartbeat was measured.

scholarly journals A 24-GHz Front-End Integrated on a Multilayer Cellulose-Based Substrate for Doppler Radar Sensors

Sensors ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 2090 ◽  
Author(s):  
Federico Alimenti ◽  
Valentina Palazzi ◽  
Chiara Mariotti ◽  
Marco Virili ◽  
Giulia Orecchini ◽  
...  
Keyword(s):  
Doppler Radar ◽  
Radar Sensors ◽  
Front End ◽  
24 Ghz

SINS/Odometer/Doppler Radar High-precision Integrated Navigation Method for Land Vehicle

2021 ◽  
pp. 1-1
Author(s):  
Bo Yang ◽  
Liang Xue ◽  
Hongdong Fan ◽  
Xiaogang Yanga
Keyword(s):  
High Precision ◽  
Doppler Radar ◽  
Integrated Navigation ◽  
Land Vehicle ◽  
Navigation Method

Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds

2010 ◽  
Vol 438 ◽  
pp. 65-72 ◽  
Author(s):  
Andreas Mehner ◽  
Ju An Dong ◽  
Timo Hoja ◽  
Torsten Prenzel ◽  
Yildirim Mutlugünes ◽  
...  
Keyword(s):  
Injection Molding ◽  
High Precision ◽  
Sol Gel ◽  
Processing Parameters ◽  
Hybrid Coatings ◽  
Optical Elements ◽  
Optical Components ◽  
New Approach ◽  
Free Silica ◽  
Gel Processing

The demand for high precision optical elements as micro lens arrays for displays increases continually. Economic mass production of such optical elements is done by replication with high precision optical molds. A new approach for manufacturing such molds was realized by diamond machinable and wear resistant sol-gel coatings. Crack free silica based hybrid coatings from base catalyzed sols from tetraethylorthosilicate (TEOS: Si(OC2H5)4) and methyltriethoxysilane (MTES: Si(CH3)(OC2H5)3) precursors were deposited onto pre-machined steel molds by spin coating process followed by a heat treatment at temperatures up to 800°C. Crack-free multilayer coatings with a total thickness of up to 18 µm were achieved. Micro-machining of these coatings was accomplished by high precision fly cutting with diamond tools. Molds with micro-structured coatings were successfully tested for injection molding of PMMA optical components. The wear resistance of the coatings was successfully tested by injection molding of 1000 PMMA lenses. Hardness and elastic modulus of the coatings were measured by nano indentation. The chemical composition was measured by X-ray photo electron spectroscopy (XPS) as a function of the sol-gel processing parameters.

New approach to high-precision Fourier transform spectrometer design

1996 ◽  
Vol 35 (16) ◽  
pp. 2891 ◽  
Author(s):  
James W. Brault
Keyword(s):  
Fourier Transform ◽  
High Precision ◽  
Fourier Transform Spectrometer ◽  
New Approach

A 24 GHz ISM-Band Doppler Radar Antenna With High Isolation Characteristic for Moving Target Sensing Applications

2019 ◽  
Vol 18 (7) ◽  
pp. 1532-1536 ◽  
Author(s):  
Sungpeel Kim ◽  
Dong Kyoo Kim ◽  
Youjin Kim ◽  
Jaehoon Choi ◽  
Kyung-Young Jung
Keyword(s):  
Doppler Radar ◽  
Moving Target ◽  
Ism Band ◽  
High Isolation ◽  
Sensing Applications ◽  
Radar Antenna ◽  
24 Ghz

Implementation of Doppler Radar at 24 GHz

2017 ◽  
pp. 675-684 ◽  
Author(s):  
Manisha Das ◽  
Tarini Singh ◽  
Soumyasree Bera
Keyword(s):  
Doppler Radar ◽  
24 Ghz

scholarly journals Speed Calibration and Traceability for Train-Borne 24 GHz Continuous-Wave Doppler Radar Sensor

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1230
Author(s):  
Lei Du ◽  
Qiao Sun ◽  
Jie Bai ◽  
Xiaolei Wang ◽  
Tianqi Xu
Keyword(s):  
Continuous Wave ◽  
Doppler Radar ◽  
Single Channel ◽  
Full Range ◽  
Calibration Method ◽  
Simulation System ◽  
Radar Sensor ◽  
Dual Channel ◽  
Calibration Methods ◽  
24 Ghz

The 24 GHz continuous-wave (CW) Doppler radar sensor (DRS) is widely used for measuring the instantaneous speed of moving objects by using a non-contact approach, and has begun to be used in train-borne movable speed measurements in recent years in China because of its advanced performance. The architecture and working principle of train-borne DRSs with different structures including single-channel DRSs used for freight train speed measurements in railway freight dedicated lines and dual-channel DRSs used for speed measurements of high-speed and urban rail trains in railway passenger dedicated lines, are first introduced. Then, the disadvantages of two traditional speed calibration methods for train-borne DRS are described, and a new speed calibration method based on the Doppler shift signal simulation by imposing a signal modulation on the incident CW microwave signal is proposed. A 24 GHz CW radar target simulation system for a train-borne DRS was specifically realized to verify the proposed speed calibration method for a train-borne DRS, and traceability and performance evaluation on simulated speed were taken into account. The simulated speed range of the simulation system was up to (5~500) km/h when the simulated incident angle range was within the range of (45 ± 8)°, and the maximum permissible error (MPE) of the simulated speed was ±0.05 km/h. Finally, the calibration and uncertainty evaluation results of two typical train-borne dual-channel DRS samples validated the effectiveness and feasibility of the proposed speed calibration approach for a train-borne DRS with full range in the laboratory as well as in the field.

scholarly journals Extended Kalman Filter (EKF) Design for Vehicle Position Tracking Using Reliability Function of Radar and Lidar

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4126 ◽  
Author(s):  
Taeklim Kim ◽  
Tae-Hyoung Park
Keyword(s):  
Kalman Filter ◽  
Sensor Fusion ◽  
Extended Kalman Filter ◽  
Reliability Function ◽  
Position Estimation ◽  
Position Tracking ◽  
Radar Sensors ◽  
Vehicle Position ◽  
Sensor Errors ◽  
Fuzzy Adaptive

Detection and distance measurement using sensors is not always accurate. Sensor fusion makes up for this shortcoming by reducing inaccuracies. This study, therefore, proposes an extended Kalman filter (EKF) that reflects the distance characteristics of lidar and radar sensors. The sensor characteristics of the lidar and radar over distance were analyzed, and a reliability function was designed to extend the Kalman filter to reflect distance characteristics. The accuracy of position estimation was improved by identifying the sensor errors according to distance. Experiments were conducted using real vehicles, and a comparative experiment was done combining sensor fusion using a fuzzy, adaptive measure noise and Kalman filter. Experimental results showed that the study’s method produced accurate distance estimations.

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