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.
| Original language | English |
|---|---|
| Pages (from-to) | 183-191 |
| Number of pages | 9 |
| Journal | Frequenz |
| Volume | 65 |
| Issue number | 7--8 |
| DOIs | |
| Publication status | Published - Aug 2011 |
Fields of science
- 202037 Signal processing
- 202033 Radar technology
JKU Focus areas
- Mechatronics and Information Processing