Commercial Off the Shelf Direct Digital Synthesizers for Digital Array Radar
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
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Up until the 1980s, conventional radar systems consisted primarily of analog circuits, which are costly to build and compatible only to a narrow band of operations. Modern digital technology offers increasing capabilities at a lower cost making it attractive for modern radar application. The Direct Digital Synthesizer DDS is one such example of digital technology that is now routinely found in newer radar system designs. The DDS characteristics that most attract radar-system designers are precision frequency tuning, phase offset control, and linear chirp capability. This study discusses the option of incorporating DDS for use in a digital pulsed andor frequency modulated continuous wave FMCW radar, and examined the necessary adaptations such as up-converting baseband signals from DDS to a radar transmission frequency, viable transmit and receive waveforms and the synchronization problem relating to synchronizing the many radiating elements that could range from a few to possibly thousands.
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