ITU-R REPORT SA.2162

Abstract

<strong>Introduction</strong> <br>At the World Administrative Radio Conference for dealing with frequency allocations in Certain Parts of the Spectrum (WARC-92) (Malaga-Torremolinos, 1992), a secondary allocation was made to the space research service in the 410-420 MHz band for space-to-space operations. These operations, limited to 5 km from an orbiting manned space vehicle, are to permit EVA communications between astronauts and between astronauts and primary or base space vehicles. As permanent space facilities are developed in the future, the needs and requirements for EVA will also increase in order to support many of the planned and envisioned space activities. This is particularly true when considering the construction, maintenance, and operation of space facilities. <br>This Report contains update to the work done at (CCIR, 1991). It shows the EVA communication requirements in the 410-420 MHz band and identifies typical communication characteristics for the fixed and mobile services in the band. The Report contains the interference investigation/analysis from the space research EVA systems to the fixed and mobile service systems in terms of power flux-densities incident at the surface of the Earth. A representative fixed service system and a representative mobile service system are used in evaluating interference to the space research EVA links. The power flux-density (pfd) levels in this Report under &#167; 4 (called new proposed PFD limits) are those in No. 5.268 in the Radio Regulations (RR).