ISO DIS 20208

Description / Abstract: SCOPE AND APPLICABILITY

This Recommended Standard contains the specification for a Delta-DOR RDEF designed for applications involving Delta-DOR raw data interchange among space agencies.

The format here specified can be equally used for collecting and exchanging more general open loop raw data.

This data format is suited to inter-agency exchanges that involve automated interaction. The attributes of the RDEF make it primarily suitable for use in computer-to-computer communication.

The characteristics of the data recording (sampling rate and quantization) are defined within the RDEF. There is no definition of accuracy for raw Delta-DOR data, and hence no assessment of accuracy is provided in the exchange format. An assessment of accuracy for reduced Delta-DOR measurements is outside the scope of this Recommended Standard. This Recommended Standard defines only the data format and content, but not the means for its transmission. The method of transmitting the data among partners is beyond the scope of this document. Data transmission could be based on a CCSDS data transfer protocol, filebased transfer protocol such as SFTP, stream-oriented media, or other secure transmission mechanism. In general, the transmission mechanism shall not place constraints on the technical data content of an RDEF.

PURPOSE

Delta-DOR (Delta Differential One-Way Ranging) is a Very Long Baseline Interferometry (VLBI) technique that can be used in conjunction with Doppler and ranging data to improve spacecraft navigation by more efficiently determining spacecraft angular position in the plane of sky. It involves the use of multiple ground stations, possibly belonging to different agencies, for simultaneous acquisition of either spacecraft or quasar signals (see reference [D2]).

This Delta-DOR Raw Data Exchange Format (RDEF) Recommended Standard specifies a standard format for use in exchanging Delta-DOR raw data among space agencies. Delta- DOR raw data exchange is required every time the data correlation involves at least one participating station not belonging to the agency responsible for the correlation.This document includes specifications on the parameter fields that the data format has been designed to meet. For exchanges where these specifications do not capture the needs of the participating agencies another mechanism may be selected.