High precision direction finding technique of microwave photonics combined time difference and phase difference
Addressing the issues of low precision in short baseline time-difference direction finding,ambiguity in long baseline phase-difference direction finding,and the difficulty of traditional microwave technologies to meet the long-distance transmission requirements for distributed deployment of electronic warfare equipment,a distributed long-distance single-baseline high-precision direction finding technology based on microwave photonics combining time-difference and phase-difference is proposed.This technology employs direct modulation mode microwave photonic transmission equipment,overcoming the impact of time-difference and phase-difference variations caused by long-distance transmission of microwave signals,ensuring stable transmission of microwave photonics over long distances.Furthermore,an improved time-difference surface fitting interpolation method is adopted to resolve the phase-difference ambiguity issue.Simulations and experimental tests have verified the feasibility of this technology for implementing high-precision distributed long-distance single-baseline direction finding.
microwave photonicstime difference direction findingphase difference direction findingreal-time correction
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