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Automotive Synthetic Aperture Radar System based on 24 GHz Series Sensors
Fabian Harrer 26.09.2017
26.09.2017 Fabian Harrer 1
Cooperation Project
26.09.2017 Fabian Harrer 2
Automotive Synthetic Aperture Radar System based on 24 GHz Series - - PowerPoint PPT Presentation
Automotive Synthetic Aperture Radar System based on 24 GHz Series - - PowerPoint PPT Presentation
Automotive Synthetic Aperture Radar System based on 24 GHz Series Sensors Fabian Harrer 26.09.2017 26.09.2017 Fabian Harrer 1 Cooperation Project 26.09.2017 Fabian Harrer 2 Motivation for radar Independent of environment, such as
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Motivation for radar
- Independent of environment, such as rain, fog
- Suitable for a hidden integration in the vehicle
- Low azimuth resolution for aperture sizes used in
automotive
26.09.2017 Fabian Harrer 3
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Synthetic Aperture Radar (SAR)
- Increasing the aperture with moving antennas: SAR
- Known as remote sensing application for airplanes/
satellites
- Resolution is range independent
- Series sensor
- Vehicle internal odometry based on wheel ticks and
gyroscope
- Single channel is sufficient
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Overview
- Fully
integrated in the vehicle
- No additional
hardware necessary
- Post
processing on the normal radar ADC data
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SAR principle
- Multiple mea-
surements are combined to form a huge aperture aperture
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Contents
1
Performance estimation
2
Evaluation of automotive relevant SAR properties
3
Measurement
4
Conclusion + Outlook
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Contents
1
Performance estimation
2
Evaluation of automotive relevant SAR properties
3
Measurement
4
Conclusion + Outlook
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Performance estimation
radar frequency band maximum azimuth resolution real aperture (2 m) synthetic aperture, range independent (2 m) 24.05 GHz to 24.25 GHz 9.0◦ = 316 mm 5.8 mm = 0.17◦ 76 GHz to 77 GHz 2.8◦ = 98 mm 1.8 mm = 0.05◦ 77 GHz to 81 GHz 2.8◦ = 98 mm 1.8 mm = 0.05◦ radar frequency band maximum range resolution 24.05 GHz to 24.25 GHz 75 cm 76 GHz to 77 GHz 15 cm 77 GHz to 81 GHz 5 cm
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Contents
1
Performance estimation
2
Evaluation of automotive relevant SAR properties
3
Measurement
4
Conclusion + Outlook
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Parameters
- Carrier frequency 24 GHz
- Bandwidth 150 MHz
- Range resolution 1 m
- Sampling rate 2 mm
- Single channel
- Antenna beamwidth 60◦
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Undistorted SAR measurement
- Measurement
- f a corner
reflector
- High azimuth
resolution
- Low range
resolution at 24 GHz 2 4 6 −6 −4 −2 East in m North in m −20 −15 −10 −5 Normalized Amplitude in dB
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Incorrect trajectory measurement
- Linear
trajectory (green line)
- Inaccurate
- dometry
measurement (red line)
- Azimuth
resolution is lost 2 4 6 −6 −4 −2 East in m North in m −20 −15 −10 −5 Normalized Amplitude in dB
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Insufficient azimuth sampling
- Azimuth
sampling theorem not satisfied
- Ambiguities
arise 2 4 6 −6 −4 −2 East in m North in m −20 −15 −10 −5 Normalized Amplitude in dB
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Contents
1
Performance estimation
2
Evaluation of automotive relevant SAR properties
3
Measurement
4
Conclusion + Outlook
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Measurement
1 2 3 4 5 6
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Measurement
1 2 3 4 5 6
Raw data, no threshold, no clustering −10 −5 2 4 6 8 10 −20 −15 −10 −5
1 2 3 4 5
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Contents
1
Performance estimation
2
Evaluation of automotive relevant SAR properties
3
Measurement
4
Conclusion + Outlook
26.09.2017 Fabian Harrer 18
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Conclusion + Outlook
- SAR processing is possible using series sensors and
- dometry
- 24 GHz band limited by range resolution
- Extension to 77 GHz necessary
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