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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Vallant, G. Epp, M. Schlecker, W. Schneider, U. Anttila, L. Valkama, M. |
| Copyright Year | 2012 |
| Description | Author affiliation: Department of Communications Engineering, Tampere University of Technology, Finland (Anttila, L.; Valkama, M.) || Cassidian, Digital Equipment, EADS Deutschland GmbH, Woerthstrasse 85, D-89077, Ulm, Germany (Vallant, G.; Epp, M.; Schlecker, W.; Schneider, U.) |
| Abstract | We address the Zero-IF or homodyne radio architecture as a pursuable way for small Radar receivers. While Zero-IF is beneficial for integration, several inherent analog impairments place a limit on the achievable dynamic range. The most dominant non-idealities are gain and phase imbalance in the IQ branches, mixer nonlinearity, and DC Offset. In the case of IQ Imbalance, careful receiver design can at best achieve an Image Rejection Ratio (IRR) of 30–40 dB. Also, IQ imbalance tends to be frequency-dependent with increasing bandwidth (BW). It has to be investigated, whether sophisticated digital post-processing is able to deliver a dynamic range sufficient for Pulse-Doppler Radar. After establishing some theoretical background and proposing digital correction methods, we will present hardware measurements of frequency-dependent IQ imbalance made on a Zero-IF receiver with large bandwidth. Despite significant improvements can be achieved using an offline calibration, time-varying drifts due to temperature changes will degrade the achievable IRR. Therefore adaptive circularity-based algorithms should be applied to track those changes. However, Radar Chirp signals at complex baseband (BB) cannot be used directly, as they are not circular. To restore the circularity for estimating the Complementary Autocorrelation Function (CACF), we propose applying a digital band-stop to the operational data beforehand. Highly increased IRR values are technically feasible: Digital Assistance acting jointly with state-of-the-art RF circuit design can pave the way for adequate performance in integrated receiver solutions. |
| Starting Page | 1703 |
| Ending Page | 1707 |
| File Size | 761650 |
| Page Count | 5 |
| File Format | |
| ISBN | 9781457717734 |
| ISSN | 10915281 |
| e-ISBN | 9781457717727 |
| DOI | 10.1109/I2MTC.2012.6229222 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-05-13 |
| Publisher Place | Austria |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Receivers Chirp Dynamic range Frequency measurement Mixers Radar tracking Pulse-Doppler Radar Zero-IF IQ Imbalance Post-Correction Digital Assistance IRR SFDR DBF |
| Content Type | Text |
| Resource Type | Article |
| Subject | Instrumentation Electrical and Electronic Engineering |
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