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http://dx.doi.org/10.5139/JKSAS.2020.48.1.73

Ultra Low Noise Hybrid Frequency Synthesizer for High Performance Radar System  

Kim, Dong-Sik (LIG NEX1)
Kim, Jong-Pil (LIG NEX1)
Lee, Ju-Young (LIG NEX1)
Kang, Yeon Duk (LIG NEX1)
Kim, Sun-Ju (Agency for Defense Development)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.48, no.1, 2020 , pp. 73-79 More about this Journal
Abstract
Modern radar system requires high spectral purity and low phase noise characteristics for very low RCS target detection and high resolution SAR (Synthetic Aperture Radar) image. This paper presents a new X-band high stable frequency synthesizer for high performance radar system, which combines DAS (Direct Analog Synthesizer) and DDS (Direct Digital Synthesizer) techniques, in order to cope with very low phase noise and high frequency agility requirements. This synthesizer offers more than 10% operating bandwidth in X-band frequency and fast agile time lower than 1 usec. Also, the phase noise at 10kHz offset is lower than -136dBc/Hz, which shows an improvement of more than 10dB compared to the current state of art frequency synthesizer. This architecture can be applied to L-band and C-band application as well. This frequency synthesizer is able to used in modern AESA (Active Electronically Scanned Array) radar system and high resolution SAR application.
Keywords
Frequency Synthesizer; DAS; DDS; Phase Noise; AESA;
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