논문 상세보기
pp.73-90
A software simulator is developed for verifying the VLBI Correlation Subsystem (VCS) trial product hardware. This software simulator includes the delay tracking, fringe rotation, bit-jump, FFT analysis, re-quantization, and auto/cross-correlation functions so as to confirm the function of the VCS trial product hardware. To verify the effectiveness of the developed software simulator, we carried out experiments using the simulation data which is a mixed signal with white noise and tone signal generated by software. We confirmed that the performance of this software simulator is similar as that of the hardware system. In case of spectral analysis and re-quantization experiment, a serious problem of the VCS hardware, which is not enough for expressing the data stream of FFT results specified in VCS hardware specification, was found by this software simulator. Through the experiments, the performance of software simulator was verified to be efficient. In future, we will improve and modify the function of software simulator to be used as a software correlator of Korea-Japan Joint VLBI Correlator (KJJVC).
1. 서론
2. VLBI상관서브시스템의 논리적인 구성
3. 소프트웨어 시뮬레이터
3.1 지연보정(Delay Compensation)
3.2 프린지 회전(Fringe Rotation, FR)
3.3 창함수(Window function)
3.4 스펙트럼 분석(Spectral Analysis)
3.5 Δ ω· Correction
3.6 재양자화(Re-quantization)
4. 실험결과 및 고찰
4.1 NICT 소프트웨어 상관기와의 비교
4.2 소프트웨어 시뮬레이터 시험결과
4.3 KVNDAS의 디지털분광기와 결과 비교
4.4 VCS 시제품의 상관결과와 비교
5. 결론
참고문헌
