A W-Band Heterodyne FMCW Radar Based on TX IQ-Modulation
-
Reinhard Feger
,
Christoph Wagner
Abstract
In this paper a method to realize a heterodyne frequency-modulated continuous-wave (FMCW) radar is presented. The proposed principle relies on the use of an inphase/quadrature (IQ)-modulator as single-sideband-mixer to shift the frequency of the FMCW-output away from dc. Since in any IQ-modulator phase and amplitude imbalances occur, the effect of these imbalances will be investigated by deriving the corresponding signal model. Based on this analysis, a method to compensate the imbalances by a predistortion of the modulation signal will be derived. The presented method does not require special test signals or additional hardware, but relies on a standard FMCW measurement onto a calibration target. A prototype radar system was built and used in test measurements to verify the proposed principle. The measurement results show that a suppression of unwanted signal components caused by IQ-imbalances better than 45 dB is achievable.
Copyright © 2011 De Gruyter
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Articles in the same Issue
- Special Issue GeMiC2011
- Inherent Resolution Limit Analysis for Millimeter-Wave Indirect Holographic Imaging
- A W-Band Heterodyne FMCW Radar Based on TX IQ-Modulation
- Broadband Patch Antenna with Polarization Multiplexing for K-Band Array Applications
- A 77 GHz Near-Field Probe with Integrated Illuminating Waveguide used for Reflectarray Characterization
- Time-Domain Emission Measurements in K-Band
- Load-Pull Investigation of a High-Voltage RF-Power GaN-HEMT Technology in Supply Modulated Applications
- Wireless Temperature Sensing with BST-Based Chipless Transponder Utilizing a Passive Phase Modulation Scheme
- Wireless Measurement System for Extracting Open Loop Micro Coil Parameters
- CRLH-TL Sensors for Flow Inhomogeneties Detection of Pneumatic Conveyed Pulverized Solids
- Dispersion Analysis of Periodic Structures by Solving Corresponding Excitation Problems
