IEEE transactions on geoscience and remote sensing, 2017-08, Vol.55 (8), p.4252-4261
2017
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Details
- Autor(en) / Beteiligte
- Titel
- Precise Calibration of Channel Imbalance for Very High Resolution SAR With Stepped Frequency
- Ist Teil von
- IEEE transactions on geoscience and remote sensing, 2017-08, Vol.55 (8), p.4252-4261
- Ort / Verlag
- New York: IEEE
- Erscheinungsjahr
- 2017
- Quelle
- IEEE Xplore Digital Library
- Beschreibungen/Notizen
- Synthetic aperture radar (SAR) images require a high-resolution system for accurate interpretations. This high range resolution can be achieved by stepped frequency chirp signals. To reconstruct a wideband waveform from each subband signal, amplitude/phase/delay imbalance between the channels should be precisely compensated. In this paper, the system configuration is first presented. Further, a calibration strategy was proposed based on three calibration loops: the reference calibration, transmitting calibration, and receiving calibration loops for coarsely compensating the channel imbalance. Then, two different methods based on the cost functions were proposed to remove the residual channel imbalance. The proposed methods were validated using stepped frequency SAR data acquired by an X-band airborne SAR system with a total bandwidth of 3.6 GHz, yielding (unweighted) a 3-dB range resolution of 4 cm.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0196-2892eISSN: 1558-0644DOI: 10.1109/TGRS.2017.2688728Titel-ID: cdi_ieee_primary_7930499
- Format
- –
- Schlagworte
- Bandwidths, Broadband, Calibration, Calibration loops, channel imbalance, Chirp, Chirp signals, cost function, Data acquisition, Frequency modulation, High resolution, Image resolution, Methods, Radar, radar data processing, Radar imaging, Resolution, SAR (radar), Signal resolution, Stepped, stepped frequency waveforms, Synthetic aperture radar, synthetic aperture radar (SAR)