This paper describes a technique of narrow-band synthetic aperture radar imaging (N-SAR), also referred to as coherent Doppler tomography (CDT), which may be a good candidate for spacebome applications. Using this approach a point spread function with a -3 dB mainlobe width of VS can be attained, where h represents the wavelength of the transmitted continuous wave signal. However, the high sidelobe level (-8dB) in the point spread function results in an unacceptable dynamic range. Two approaches to reducing the sidelobe level are presented. One uses multiple discrete frequencies; the other uses a noncoherent subaperture processing technique.Simulation results demonstrate that the sidelobe level is substantially reduced in both methods. The price paid for this improvement in the sidelobe level, is a slight increase in the mainlobe width of the point spread function.,

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