Coherent Doppler tomography-a technique for narrow band SAR
| Autor: | B.K. Chang, N. Magotra, J.W. McCoy |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Point spread function
Synthetic aperture radar Computer science business.industry Doppler radar Aerospace Engineering Iterative reconstruction Signal Space-based radar law.invention symbols.namesake Narrowband Optics Space and Planetary Science law Radar imaging symbols Electrical and Electronic Engineering Radar business Image resolution Doppler effect |
| Zdroj: | IEEE Aerospace and Electronic Systems Magazine. 6:19-22 |
| ISSN: | 0885-8985 |
| DOI: | 10.1109/62.67844 |
| Popis: | Some concerns regarding a technique of narrowband synthetic aperture radar (N-SAR) imaging called coherent Doppler tomography (CDT), which may be a good candidate for spaceborne applications, are addressed. Using a single-frequency signal, are addressed. Using a single-frequency signal, resolution of two tenths of a wavelength can be achieved in the point spread function if the radar platform circles the ground path to be imaged. However, the high sidelobe level of -8-dB in the point spread function results in an unacceptable dynamic range. To reduce the sidelobe level, two approaches are presented: coherent processing using multiple discrete frequencies and noncoherent subaperture processing. Simulation results demonstrate that the sidelobe level is substantially reduced by both methods. However, the resolution is degraded and the computational overhead is greatly increased for noncoherent subaperture processing. Also presented is a possible satellite geometry configuration that could utilize N-SAR processing to provide high-resolution global mapping capability. > |
| Databáze: | OpenAIRE |
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