抄録
VLBI data analysis system has been developed for the VRAD mission of Japanese lunar explorer program KAGUYA. The system is composed of correlation and delay estimation parts. Carrier search program has been newly developed in the correlation part. This program automatically distinguishes the carrier wave signal of the lunar orbiter from spurious signal. The delay estimation part has been newly developed. This program corresponds to the multi frequency VLBI method and estimate the cycle ambiguity of S-band and X-band signal automatically. Graphical user interfaces has been also developed both for the correlation and delay estimation parts. VLBI data analysis system contributes a great deal to reduce processing time. This makes it possible to accumulate the delay data which is enough to estimate the orbit of lunar orbiters and lunar gravity field precisely. Moreover, our system is applicable to future deep space mission in terms of orbit determination by using VLBI technique.
