Phase-Coherent Dual Frequency Link for High Precision Doppler Tracking

File — Box: 1, Folder: 34

Staff Only

Dates

Creation: 1974 - 1978

Creator

From the Collection: United States. National Aeronautics and Space Administration (1958-) (Organization)

Conditions Governing Access

This collection is open for research in the Archives & Special Collections reading room. Handling guidelines and use restrictions will be communicated and enforced by archives staff members.

Extent

From the Collection: 1 Linear foot (1 box. )

Language of Materials

From the Collection: English

Additional Description

General

During the Apollo-Soyuz Test Project, a phase-coherent dual frequency link was established between the Docking Module (DM) and the Apollo Command Service Module (CSM). The purpose of the radio link was to enable relative Doppler measurments to an accurcy of the order of the one millihertz between the two modules. These measuremnts will be used to detect mass concentrations (mascons) in the earth's crust of the 10 milligal and greater. The link operates at 162 and 324 MHz.

Source: D Reidel Publishing Co. Dordrecht, Holland.