scope:

This standard describes the use of spread spectrum modulation in RF satellite communications systems and presents a detailed specification of the particular PN spread formats implemented in the low rate data transmission and PN range tracking services currently used by NASA systems. The functions and required capabilities of each element of PN spread links are also provided, including the typical signal flow and equipment characteristics and constraints involved.

Relevant information on the specification of PN sequences for use in NASA systems is also provided.

Purpose

This standard is intended to provide a comprehensive description of the PN spread spectrum modulation formats used in NASA links and to give associated technical requirements from the system level to the component level. The document is organized to support a range of uses, from providing basic system description, capabilities listing, and theoretical background for readers seeking a general understanding of existing systems to documenting the detailed technical requirements necessary for implementing hardware that is compatible with the current NASA systems.