| 摘要 |
An optical SAR transmits toward a target an amplitude modulated optical signal. Modulation of optical signals may be performed using light emitting devices such as semiconductor laser diodes driven by a modulation signal so that the emitted optical signal intensity is amplitude modulated. Transmitted optical signals are reflected from a target, and reflected optical signals are detected by light detecting devices such as photodiodes that detect and automatically demodulate the reflected optical signals. Optical elements such as a polarizer, a lens, and a frequency filter such as a color filter may optically process the amplitude modulated optical signal before transmission and detection. This technique achieves the potential benefits of an optical SAR, such as high resolution, better image quality, and elimination of electromagnetic interference, while circumventing many of the problems traditionally associated with optical SARs, such as the requirement for optical coherence and extremely accurate platform motion measurements.
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