The Second TDC Meeting was held

Agenda

• 1. Opening
  Opening, by Mr.A.Sugiura, Director of Standards and Measurements Division, CRL
• 2. Report on the Technical Developments in 1991
  • (1) Outline
  • (2) K-4 System Development
  • (3) Earth Rotation Observation
  • (4) Geodesy
  • (5) Millimeter Wave VLBI and Radio Astronomical Aspects
  • (6) Utilization of Satellite Technipues
• 3. Discussion on the report
• 4. Discussion on the proposal about the Antarctica VLBI

MINUTES OF THE MEETING

Hama: It is planned, and is under development.

Okihara: Regarding the K-4 data recorder, GP-IB is available as well as RS422 interface. Moreover VME bus and SCSI interface are also available in near future. So controlling the K-4 data recorder will be easier by making use of a variety of functions.

Kawaguchi : I hope 22GHz band receiver will be also included at the Antarctic station in Syowa for the future VLBI.

Nakayama: Loss in the radome and surface accuracy of the 11m dish have to be taken into account. I think it is technically possible.

Uchida: What is the difference between K-4 and new K-4?

Kawaguchi: It has been a rule that new number (one digit) is given for a system when we introduce a new type data recorder in it. But to distinguish a system by version number (more detail) must be necessary after significant modification to avoid confusion.

Nakahori: We are analyzing the long and short tidal terms to distinguish the mean sea level change from the tidal effects. These results will be taken into account when we evaluate our VLBI data.

Following the above discussion, a topic concerning the promotion of a VLBI project in the Syowa station was discussed. Discussions about this topic are also shown below.

Finally, it was suggested that the policy of VLBI development should be discussed between both Technical Development Centers in the United States and Japan. We will try to find an effective way for this purpose.

Discussion on the Resolution proposed by Prof. Ejiri about Promoting the VLBI project in Syowa station

Kawaguchi: I agree with the meaning of the proposal. But why does the TDC make such a resolution?

Uchida: We can endorse the plan from the technical point of view. I suggest to stress the technical points in the proposal.

Sugiura: I think the endorsement should be made also from the Japanese committee on geodesy.

Ejiri: It takes time. But I should try.

Sasao: I will also try to get an endorsement at the Japanese committee on astronomy.

Attendees

Abbreviation:

CRL: Communications Research Laboratory
NAO: National Astronomical Observatory
GSI: Geographical Survey Institute
NIPR: National Institute of Polar Research

Tokyo SLR Station