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Currently 67 Books Listed
Re-entry Data Message. Blue Book. Issue 1. November 2019.
This Recommended Standard specifies a standard message format to be used in the exchange of spacecraft re-entry information between Space Situational Awareness (SSA) or Space Surveillance and Tracking (SST) data providers, satellite owners/operators, and other parties. These messages can be used to inform spacecraft owners/operators of predicted re-entries or warn civil protection agencies about potential ground impacts.
Navigation Data--Definitions and Conventions. Green Book. Issue 4. November 2019.
This Report contains technical material to supplement the CCSDS Recommended Standards for spacecraft navigation data. The topics covered include radiometric data content, spacecraft ephemeris, planetary ephemeris, tracking station locations, coordinate systems, and attitude data. This Report deals explicitly with the technical definitions and conventions associated with interagency cross-support situations involving the transfer of ephemeris, tracking, and attitude data. The current issue brings the Green Book up to date with the current issue of Orbit Data Messages (CCSDS 502.0-B-2) as well as the new Recommended Standards for Tracking Data Message and Attitude Data Messages (CCSDS 503.0-B1 and CCSDS 504.0-B-1, respectively).
Delta-DOR--Technical Characteristics and Performance. Green Book. Issue 2. November 2019.
This Informational Report describes the theoretical aspects of and discusses trade-offs and system performance for the navigation technique known as Delta Differential One-Way Ranging (Delta-DOR). The topics covered include a general description of the technique, theoretical background, definition of observables, estimates of system performance, system trade-offs, and descriptions of existing systems. This Report deals explicitly with the technical definitions and conventions associated with inter-Agency cross-support situations involving Delta Differential One-way Ranging operations.
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CCSDS 211.2-B-3
File size 534 KB
Proximity-1 Space Link Protocol--Coding and Synchronization Sublayer. Blue Book. Issue 3. October 2019.
The CCSDS Recommended Standard for Proximity-1 Space Link Protocol—Coding and Synchronization Sublayer specifies the synchronization and channel coding schemes used with the Proximity-1 Data Link Protocol. The current update adds applicability to Unified Space Data Link Protocol, CCSDS 732.1-B-1.
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CCSDS 524.4-B-1
File size 756 KB
Mission Operations--Message Abstraction Layer Binding to ZMTP Transport. Blue Book. Issue 1. October 2019.
This Recommended Standard defines the binding between the Mission Operations (MO) Message Abstraction Layer (MAL) and the ZeroMQ Message Transport Protocol (ZMTP). This binding allows MO Services to use ZMTP as messaging technology in all situations where this may be required.
Optical Communications Physical Layer. Blue Book. Issue 1. August 2019.
This Recommended Standard specifies the Physical Layer characteristics of free-space optical communications systems used by space missions.
Optical Communications Coding and Synchronization. Blue Book. Issue 1. August 2019.
This Recommended Standard specifies channel coding and synchronization schemes for free space optical communications systems used by space missions.
CCSDS Cryptographic Algorithms. Blue Book. Issue 2. August 2019.
This Recommended Standard provides the basis for standard CCSDS security algorithms. The document recommends a single symmetric block-cipher encryption algorithm and several authentication algorithms. This update increases the specified key size for greater security.
Corrigendum 1 to CCSDS 320.0-M-7, Issued November 2017. Magenta Book. Issue 7 Cor. 1. July 2019.
This Technical Corrigendum documents changes to CCSDS 320.0-M-7, CCSDS Spacecraft Identification Field Code Assignment Control Procedures (Magenta Book, Issue 7, November 2017)
Schedule-Aware Bundle Routing. Blue Book. Issue 1. July 2019.
This Recommended Standard specifies Schedule-Aware Bundle Routing (SABR) for the forwarding of Delay-Tolerant Networking (DTN) bundles in the space environment. SABR provides dynamic route computation in an environment of stable topology but time-varying connectivity when instances of connectivity are scheduled rather than opportunistic.
Technical Corrigendum 1 to CCSDS 123.0-B-2, Issued February 2019. Blue Book. Issue 2 Cor. 1. July 2019.
The Recommended Standard for multispectral and hyperspectral image compression specifies a data compression algorithm applied to digital three-dimensional image data from payload instruments, such as multispectral and hyperspectral imagers. Lossless and near-lossless methods are specified, along with a format for storing the compressed data.
CCSDS Authentication Credentials. Blue Book. Issue 1. July 2019.
This CCSDS Recommended Standard provides the specification for credentials to be used for authentication by CCSDS missions and ground systems.
SCCC--Summary of Definition and Performance. Green Book. Issue 1. April 2019.
It is expected that a number of Earth Exploration Satellite Service (EESS) missions will carry payloads producing substantial data rates, that is, starting from a few hundred Mb/s. Such missions would benefit from employing transmitters using a state-of-the-art air interface that exploits link adaption, that is, achieves high spectral efficiency by adjusting the modulation and coding to the link budget.
CCSDS Guide for Secure System Interconnection. Green Book. Issue 2. April 2019.
This CCSDS Informational Report is an adaptation of United States National Institute of Standards and Technology (NIST) Security Guide for Interconnecting Information Technology Systems (NIST Special Publication 800-47). The CCSDS Report is tailored for the space community and provides a guide for secure space agency interconnections.
Spacecraft Onboard Interface Services--XML Specification for Electronic Data Sheets. Blue Book. Issue 1. April 2019.
This Recommended Standard defines the XML Specification for SOIS Electronic Data Sheet (SEDS). The SEDS is for use in electronically describing the data interfaces offered by flight hardware such as sensors and actuators over the SOIS Subnetwork Services.
Security Guide for Mission Planners. Green Book. Issue 2. April 2019.
This Informational Report provides guidance to mission planners in developing the management, operational, and technical security controls appropriate to the value of their system and the information processed in it.
Technical Corrigendum 1 to CCSDS 232.1-B-2, Issued September 2010. Blue Book. Issue 2 Cor. 1. April 2019.
This Technical Corrigendum documents changes to CCSDS 232.1-B-2, Communications Operation Procedure-1 (Blue Book, Issue 2, September 2010).
Spectral Pre-Processing Transform for Multispectral & Hyperspectral Image Compression. Green Book. Issue 1. March 2019.
This Informational Report presents a summary of the key operational concepts and rationale that underlie the requirements for CCSDS 122.1-B-1, Spectral Preprocessing Transform for Multispectral and Hyperspectral Image Compression (Blue Book, Issue 1, September 2017).
Guidelines for the Specification of Cross Support Transfer Services. Magenta Book. Issue 1. March 2019.
This Recommended Practice defines the guidelines for the specification of CCSDS-standard Cross Support Transfer Services based on the CSTS Specification Framework.
The Application of Security to CCSDS Protocols. Green Book. Issue 3. March 2019.
This Report is intended to provide guidance to missions that wish to use the CCSDS Recommendations for spacecraft control and data handling but also require a level of security or data protection. The report provides background information on security, details various options for security implementation in space missions, and outlines the impact of security on defined CCSDS services.
Radio Frequency and Modulation Systems--Part 1: Earth Stations and Spacecraft . Blue Book. Issue 29. March 2019.
Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current issue updates recommendations 2.4.17A, 2.4.22A, and 2.4.22B and adds new recommendation 3.1.7.
Low-Complexity Lossless and Near-Lossless Multispectral and Hyperspectral Image Compression. Blue Book. Issue 2. February 2019.
The Recommended Standard for multispectral and hyperspectral image compression specifies a data compression algorithm applied to digital three-dimensional image data from payload instruments, such as multispectral and hyperspectral imagers. Lossless and near-lossless methods are specified, along with a format for storing the compressed data. The current version of this document contains all updates through technical corrigendum 1, dated July 2019.
Optical High Data Rate (HDR) Communication--1064 NM . Orange Book. Issue 1. December 2018.
This Experimental Specification contains the technical specification for implementing the Physical Layer and the Coding and Synchronization (sub)layer of optical communication systems. It is based on the High Data Rate (HDR) scenario implemented in ESA missions (EDRS series, Sentinel series).
Mission Operations Message Abstraction Layer--C++ API. Magenta Book. Issue 1. December 2018.
This Recommended Practice defines a C++ API for the Mission Operations Message Abstraction Layer specified in CCSDS 521.0-B-2.
Voice Communications. Green Book. Issue 2. December 2018.
This CCSDS Informational Report presents an overview of voice communications in use in human spaceflight.
Unified Space Data Link Protocol. Blue Book. Issue 1. October 2018.
This CCSDS Recommended Standard specifies the Unified Space Data Link Protocol (USLP) for use by space missions over space-to-ground, ground-to-space, or space-to-space communications links.
Concepts and Rationale for Streaming Services over Bundle Protocol. Green Book. Issue 1. September 2018.
The purpose of this document is to discuss concepts and rationale for real-time video streaming services over Bundle Protocol. Previous testing of video streams over Bundle Protocol is documented. A common test configuration for continued testing and benchmarking of video (and other streaming data) is also documented.
CCSDS Recommended Procedures for Cloud-Based Interoperability Testing. Yellow Book - CCSDS Normative Procedures. Issue 1. June 2018.
This CCSDS Record specifies a recommended practice for performing inter-agency CCSDS standards interoperability testing using cloud technologies.
Space Data Link Security Protocol--Summary of Concept and Rationale. Green Book. Issue 1. June 2018.
This Informational Report presents the concept and rationale for the CCSDS Recommended Standard on the Space Data Link Security Protocol.
Network Layer Security Adaptation Profile. Blue Book. Issue 1. June 2018.
This CCSDS Recommended Standard provides the basis for Network Layer security for missions utilizing the Internet Protocol (IP), including missions using IP over CCSDS Space Links.
Mission Operations--Message Abstraction Layer Binding to HTTP Transport and XML Encoding. Blue Book. Issue 1. June 2018.
This Recommended Standard specifies the binding between the Mission Operations (MO) Message Abstraction Layer (MAL) and the Hypertext Transfer Protocol (HTTP) and defines an XML encoding for MAL data types.
Mission Planning and Scheduling. Green Book. Issue 1. June 2018.
This Informational Report documents mission planning scenarios, use cases, and deployment architectures relevant to the creation of standards for mission planning and scheduling.
Corrigendum 1 to CCSDS 508.0-B-1, Issued June 2013. Blue Book. Issue 1 Cor. 1. June 2018.
This Technical Corrigendum documents changes to CCSDS 508.0-B-1, Conjunction Data Message (Blue Book, Issue 1, June 2013).
Data Entity Dictionary Specification Language (DEDSL)--XML/XSD Syntax . Orange Book. Issue 1. May 2018.
This Experimental Specification provides a new implementation of the Abstract Syntax of the Data Entity Dictionary Specification Language (DEDSL) (CCSDS 647.1-B-1) using the XML Schema definition for the construction and interchange of data entity dictionaries, while being fully compatible with the XML/DTD Syntax (CCSDS 647.3-B-1).
Cross Support Service Management--Simple Schedule . Blue Book. Issue 1. May 2018.
This Recommended Standard specifies a standard format for use in transferring scheduling information related to ground stations and/or relay satellites between space agencies and commercial or governmental spacecraft operators.
Radio Frequency and Modulation Systems--Part 1: Earth Stations and Spacecraft. Silver Book. Issue 28. February 2018.
Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current issue updates recommendations 2.1.4A and 2.1.4B, deletes recommendations 2.1.8A and 2.1.8B, and adds new recommendation 2.6.11A.
Bandwidth-Efficient Modulations--Summary of Definition, Implementation, and Performance. Green Book. Issue 3. February 2018.
This Report contains technical material to supplement the CCSDS Recommendations for the standardization of modulation methods for high symbol rate transmissions generated by CCSDS Member Agencies.
Delta-Differential One Way Ranging (Delta-DOR) Operations. Magenta Book. Issue 2. February 2018.
This Recommended Practice specifies a set of standard practices and message formats for use in the navigation technique known as Delta Differential One-Way Ranging (Delta-DOR). The current issue adds clarifications, adds a subsection on quantitative validation criteria, renames 'Service Request' to 'Support Request', adds Support Request specifications, adds examples of Support Requests as new annex, deletes section 7 in favor of reference to the Delta-DOR Quasar Catalogue.
Delta-DOR Quasar Catalog Update Procedure. Magenta Book. Issue 1. February 2018.
This Recommended Practice provides specifications for a quasar catalogue to be used in Delta-DOR measurements; description of the catalogue update process; procedures and qualitative criteria to evaluate whether the updates of such catalogues are acceptable; description of the registries to be included in a quasar catalogue; and rules to update SANA entries.
Pointing Request Message. Blue Book. Issue 1. February 2018.
This Recommended Standard defines the Pointing Request Message (PRM), a standardized format that allows space agencies and operators to exchange information about requested (sequences of) changes to the attitude of the spacecraft or to an articulated spacecraft component.
Voice and Audio Communications . Blue Book. Issue 1. November 2017.
This Recommended Standard specifies the technologies, services, and service interfaces for real-time or near real-time voice and audio communications among terrestrial facilities and space systems in support of the mission operations of space flight.
Mission Operations--Message Abstraction Layer Binding to TCP/IP Transport and Split Binary Encoding. Blue Book. Issue 1. November 2017.
This CCSDS Recommended Standard specifies a binding of the Mission Operations Message Abstraction Layer (MAL) to TCP/IP using a split binary encoding for MAL data types.
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CCSDS 320.0-M-7
File size 434 KB
CCSDS Spacecraft Identification Field Code Assignment Control Procedures. Magenta Book. Issue 7. November 2017.
This Recommended Practice defines the procedures governing assignment, relinquishment, and management of CCSDS Spacecraft Identification (SCID) codes. The current update adds frequency band as a qualifier for SCID assignment, names the SCID qualified by version number and frequency band the Qualified SCID (Q-SCID), and replaces the outdated hard-copy request form with instruction to use the online form on the Space Assigned Numbers Authority (SANA) Web site. The current version of this document contains all updates through technical corrigendum 1, dated July 2019.
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CCSDS 401.0-B-27-S
File size 2608 KB
Radio Frequency and Modulation Systems--Part 1: Earth Stations and Spacecraft. Silver Book. Issue 27. November 2017.
Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current draft updates recommendations 2.4.18 and 2.5.6B.
Spacecraft Onboard Interface Services--RFID . Blue Book. Issue 1. October 2017.
This Recommended Standard specifies tag-encoding options that augment, yet remain compatible with, a legacy ISS Inventory Management System tag encoding schema established for early flight experiments.
Mission Operations Monitor & Control Services . Blue Book. Issue 1. October 2017.
This Recommended Standard defines the Mission Operations Monitor and Control services in conformance with the service framework specified in the Mission Operations Services Concept Green Book (CCSDS 520.0-G-3).
Image Data Compression. Blue Book. Issue 2. September 2017.
This Recommended Standard defines an image-data compression algorithm applicable to digital data from payload instruments and specifies means to control compression rate and how these compressed data shall be inserted into source packets for retrieval and decoding. The current issue adds modifications to support the Recommended Standard for Spectral Pre-Processing Transform for Multispectral and Hyperspectral Image Compression.
Spectral Preprocessing Transform for Multispectral and Hyperspectral Image Compression. Blue Book. Issue 1. September 2017.
This Recommended Standard is an extension to CCSDS 122.0-B-2, Image Data Compression (Blue Book, Issue 2), defining a data compression algorithm that can be applied to digital three-dimensional image data from payload instruments, such as multispectral and hyperspectral imagers, and specifying the compressed data format.
TM Synchronization and Channel Coding. Blue Book. Issue 3. September 2017.
The Recommended Standard for TM Synchronization and Channel Coding contains specifications to be used by space missions on synchronous communications links. The current update adds LCPC coding for a stream of Sync-Marked Transfer Frames (SMTFs).
TC Synchronization and Channel Coding. Blue Book. Issue 3. September 2017.
The Recommended Standard for TC Synchronization and Channel Coding contains specifications for synchronization and channel coding to be used by space missions on asynchronous communications links. The current issue adds LCPC coding; globally changes 'codeblock' to 'codeword' for consistency with modern usage; deletes obsolete annex detailing changes from documents retired in 2005.
Real-Time Weather and Atmospheric Characterization Data. Green Book. Issue 1. May 2017.
This Informational Report identifies and describes the atmospheric constituents that are most responsible for transmission losses in optical communications links at wavelengths near 1550 and 1064 nm. Considerations concerning the temporal measurement of the atmospheric parameters are discussed, along with the possible ways the data can be used for long-term ETS characterization and real-time operations, including handover prediction support.
Simultaneous Transmission of GMSK Telemetry and PN Ranging. Green Book. Issue 1. May 2017.
This Informational Report is an adjunct document to the CCSDS Recommended Standard for Pseudo-Noise (PN) Ranging Systems (CCSDS 414.1-B-1). It provides background information and discussion of technical details related to the PN ranging systems defined by the CCSDS Recommended Standard.
Wireless Network Communications Overview for Space Mission Operations. Green Book. Issue 3. May 2017.
This Informational Report contains background and explanatory material to support the CCSDS wireless network communications Best Practices for networked wireless communications in support of space missions. It examines the possibilities and advantages of the onboard application of wireless communications technology to space missions, describes a set of driving use cases in the space domain, and evaluates the utilization of existing technologies and related terrestrial commercial standards to meet the resulting space-based use case requirements. Also included is relevant tutorial information intended to assist the reader in understanding basic concepts of wireless transmission and networking along with possible issues related to the deployment of wireless networks.
Cross Support Transfer Service--Specification Framework. Blue Book. Issue 1. April 2017.
This Recommended Standard defines the various logical components required for specifying Cross Support Transfer Services.
Cross Support Transfer Services--Monitored Data Service. Blue Book. Issue 1. April 2017.
This Recommended Standard defines the Monitored Data Cross Support Transfer Service (CSTS), which allows a spaceflight mission to receive cyclic reports on, and to query the current values of, the parameters that are pertinent to cross support services being provided by a Cross Support Complex. The Monitored Data service also allows a spaceflight mission to receive notifications of the occurrence of events of interest associated with the services that are being provided by a Cross Support Complex.
CCSDS Protocols over DVB-S2--Summary of Definition, Implementation, and Performance. Green Book. Issue 1. November 2016.
This document is a CCSDS Informational Report that contains background and explanatory material to support the CCSDS Recommended Standard for CCSDS Space Link Protocols over ETSI DVB-S2 Standard.
Telerobotic Operations. Green Book. Issue 1. November 2016.
This CCSDS Informational Report contains overview and descriptive material supporting analysis, requirements, descriptions of use, scenarios, etc., pertinent to the development of standards that support the safe, collaborative operation of mixed teams of human and robotic assets in the exploration of space.
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CCSDS 401.0-B-26-S
File size 2472 KB
Radio Frequency and Modulation Systems--Part 1: Earth Stations and Spacecraft. Silver Book. Issue 26. October 2016.
Numerous concise recommendations appear in the notebook volume bearing the number 401.0-B. Each recommendation is dated, and the most recent revision is shown in the table of contents. These Recommendations are developed for conventional near-Earth and deep-space missions having moderate communications requirements. The current issue adds new recommendation 2.4.23, Modulation Methods at High Symbol Rate Transmissions, Earth Exploration Satellites (EES) 25.5¬27.0 GHz Band, Space-to-Earth.
Producer-Archive Interface Specification (PAIS)--A Tutorial. Green Book. Issue 1. September 2016.
This CCSDS Informational Report provides a tutorial for CCSDS 651.1-B-1, Producer-Archive Interface Specification (PAIS) (Blue Book, Issue 1, February 2014).
Corrigendum 1 to 914.0-M-2, issued September 2015. Magenta Book. Issue 2 Cor. 1. August 2016.
This corrigendum documents changes to CCSDS 914.0-M-2, Space Link Extension—Application Program Interface for Transfer Services—Core Specification (Magenta Book, Issue 2, September 2015).
Digital Motion Imagery. Blue Book. Issue 2. August 2016.
This Recommended Standard provides a common reference and framework of standards for digital motion imagery and provides recommendations for utilization of international standards for capturing and transferring motion imagery between spacecraft elements and ground systems. The current draft adds support for MPEG4 recording and JPEG2000 transmission.
Space Link Extension--Return All Frames Service Specification. Blue Book. Issue 4. August 2016.
The Recommended Standards for Space Link Extension (SLE) services specify data services conformant to the transfer services specified in Cross Support Reference Model—Part 1: SLE Services (CCSDS 910.4-B-2). The current updates add clarifications and corrections, add or update production status annexes for consistency across all five SLE service specifications, and update specifications to accommodate recent additions to the CCSDS Recommended Standards for coding and synchronization.
Space Link Extension--Return Operational Control Fields Service Specification. Blue Book. Issue 3. August 2016.
The Recommended Standards for Space Link Extension (SLE) services specify data services conformant to the transfer services specified in Cross Support Reference Model—Part 1: SLE Services (CCSDS 910.4-B-2). The current drafts add clarifications and corrections, add or update production status annexes for consistency across all five SLE service specifications, and update specifications to accommodate recent additions to the CCSDS Recommended Standards for coding and synchronization.
Space Link Extension--Return Channel Frames Service Specification. Blue Book. Issue 3. August 2016.
The Recommended Standards for Space Link Extension (SLE) services specify data services conformant to the transfer services specified in Cross Support Reference Model—Part 1: SLE Services (CCSDS 910.4-B-2). The current drafts add clarifications and corrections, add or update production status annexes for consistency across all five SLE service specifications, and update specifications to accommodate recent additions to the CCSDS Recommended Standards for coding and synchronization.
Space Link Extension--Forward CLTU Service Specification. Blue Book. Issue 4. August 2016.
The Recommended Standards for Space Link Extension (SLE) services specify data services conformant to the transfer services specified in Cross Support Reference Model—Part 1: SLE Services (CCSDS 910.4-B-2). The current drafts add clarifications and corrections, add or update production status annexes for consistency across all five SLE service specifications, and update specifications to accommodate recent additions to the CCSDS Recommended Standards for coding and synchronization.
Space Link Extension--Forward Space Packet Service Specification. Blue Book. Issue 3. August 2016.
The Recommended Standards for Space Link Extension (SLE) services specify data services conformant to the transfer services specified in Cross Support Reference Model—Part 1: SLE Services (CCSDS 910.4-B-2). The current drafts add clarifications and corrections, add or update production status annexes for consistency across all five SLE service specifications, and update specifications to accommodate recent additions to the CCSDS Recommended Standards for coding and synchronization.
CCSDS SANA Registry Management Policy. Yellow Book - CCSDS Normative Procedures. Issue 1. June 2016.
This document describes the CCSDS Space Assigned Numbers Authority (SANA) Registry Management Policy and related procedures.
Procedures for SANA Registry Specification. Yellow Book - CCSDS Normative Procedures. Issue 1. May 2016.
This document defines procedures for CCSDS Working Group (WG) interactions with the CCSDS Space Assigned Numbers Authority (SANA) for the purpose of creating and modifying SANA registries.
Space Assigned Numbers Authority (SANA)--Role, Responsibilities, Policies, and Procedures. Yellow Book - CCSDS Normative Procedures. Issue 2. May 2016.
This CCSDS Record defines the Space Assigned Numbers Authority (SANA), its role, responsibilities, policies, and procedures within the Consultative Committee for Space Data Systems (CCSDS).
Corrigendum 2 to CCSDS A02.1-Y-4, Issued April 2014. Yellow Book - CCSDS Normative Procedures. Issue 4 Cor. 2. January 2016.
This Corrigendum documents changes to CCSDS A02.1-Y-4, Organization and Processes for the Consultative Committee for Space Data Systems (Yellow Book, Issue 4, April 2014).
Lossless Multispectral and Hyperspectral Image Compression. Green Book. Issue 1. December 2015.
This Informational Report presents a summary of the key operational concepts and rationale that underlie the requirements for the CCSDS Recommended Standard for Lossless Multispectral & Hyperspectral Image Compression, CCSDS 123.0-B-1, and provides a broad tutorial overview of algorithm.
Security Threats against Space Missions. Green Book. Issue 2. December 2015.
This CCSDS Informational Report provides an overview of potential threats against various categories of civilian space missions and provides illustrative security threat data for mission planners.
Navigation Data Messages Overview. Green Book. Issue 1. December 2015.
This Informational Report contains background and explanatory material to supplement the CCSDS Recommended Standards for spacecraft navigation data.
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