1. California Institute of Technology,Dept. of Electrical Engineering,Pasadena,U.S.A.
2. California Institute of Technology,Graduate Aerospace Laboratories,Pasadena,U.S.A.
3. California Institute of Technology,Dept. of Applied Physics,Pasadena,U.S.A.
4. Jet Propulsion Laboratory,Pasadena,U.S.A.
5. System Engineering Consultants,Columbia,U.S.A.