ModelsandSignal Processing forMillimeter-Wave LFMCW SARImaging

Inremote sensing applications, there isaspecial interest inlightweight, costeffective, andhighresolution imaging sensors. Thecombination oflinearly frequency modulated continuous wave(LFMCW)technology and synthetic aperture radar (SAR)technique canlead tosucha sensor. Assuch, this paper concentrates onthemodels and signal processing ofmillimeter-wave (mmW)LFMCW SARforhigh-resolution imaging, whichincludes twomain parts. Inthefirst part, thesystemmodelsanduseful relations formmW LFMCW SAR imaging areprovided, andanimageformation algorithm that takes into account thespecial characteristics ofCW (continuous wave) SARis investi-gated. Thesecond partfocuses ontheimpact of LFMCW waveform errors onSARimagery. Theallowable magnitudes ofphase error foreachcategory arequantified, andaneffective compensation technique forcompensating possible frequency nonlinearity errors inLFMCW signals is presented. Thusthenovel combination ofmmW LFMCW andSARcanpavethewayforthedevelopment ofasmall, lightweight, andhighresolution imaging sensor. 12