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MARS COMMUNICATION PROTOCOLS. G. J. Kazz1 and E Concepts and Approaches for Mars Exploration 6114.pdf MARS COMMUNICATION PROTOCOLS. G. J. Kazz1 and E. Greenberg 2, 1Jet Propulsion Laboratory, Califor- nia Institute of Technology, 4800 Oak Grove Dr. Pasadena, CA. 91109, [email protected]., 2Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr. Pasadena, CA. 91109, egreen- [email protected]. Introduction: Over the next decade, international messaging service between In-Situ assets. Proximity-1 plans and commitments are underway to develop an is a bi-directional protocol using the same format and infrastructure at Mars to support future exploration of procedures in the forward (command) as well as the the red planet. The purpose of this infrastructure is to return (telemetry) link. It provides for expedited as provide reliable global communication and navigation well as reliable data transfer. It is truly a modeless coverage for on-approach, landed, roving, and in-flight assets at Mars. The claim is that this infrastructure protocol meaning all of the services provided do not will: 1) eliminate the need of these assets to carry Di- require that the caller or responder be configured into a rect to Earth (DTE) communications equipment, 2) particular mode for operations. It supports all types of significantly increase data return and connectivity, 3) directionality: full, half duplex, and simplex. It uses a enable small mission exploration of Mars without DTE data driven technique as opposed to a managed ap- equipment, 4) provide precision navigation i.e., 10 to proach for on-board data processing. It supports both 100m position resolution, 5) supply timing reference coded and uncoded links as well as asynchronous accurate to 10ms. [1]. This paper in particular focuses (variable frame) vs synchronous (fixed frames) links. on two CCSDS recommendations for that infrastruc- Communication is point-to-point but includes one to ture: CCSDS Proximity-1 Space Link Protocol [2] and many on the forward link. CCSDS File Delivery Protocol (CFDP)[3]. A key as- CFDP Key Characteristics: CFDP is an interna- pect of Mars exploration will be the ability of future missions to interoperate. These protocols establish a tional standard for automatic, reliable or expedited bi- framework for interoperability by providing standard directional file transfer between spacecraft or space- communication, navigation, and timing services. In craft and ground, built on top of the CCSDS data link addition, these services include strategies to recover layer. Unlike TCP/IP, it requires no handshaking and is gracefully from communication interruptions and inter- datagram and transaction based to deal with space link ference while ensuring backward compatibility with characteristics e.g., long RTLT and non-persistent previous missions from previous phases of exploration. links but is adaptable to fit the proximity link as well. [4]. Metadata associated with each transaction describes Need for Standardization: The diversity of the data transfer including data processing once the file communication links within the future potential Mars arrives. environment creates challenging engineering problems. Operational Scenarios: The following scenarios Problems such as frequency coordination, link opera- examine operations across two separate links: proxim- tions, standard data transfer, product accountability, ity (landed assets to orbiters) and deep space (orbiters link performance, scheduling vs demand access of to Earth). The proximity link is characterized by short services, and network-wide data prioritization need to distance (within 400,000 km), moderate signal be addressed. The CCSDS Proximity-1 Space Link strength, and single sessions. The deep space link is Protocol provides recommendations for dealing with characterized by long delays, and weak signals. The the components of these issues in the physical and data following 5 scenarios generically demonstrate opera- link layers. These include frequency allocation, coding, tions between Mars landed assets, orbiter relays, and data rates, link establishment, maintenance, and termi- Earth ground stations. nation procedures, reliable or expedited data transfer, Scenario 1: Simple Relay. The objective is to trans- ranging and time transfer. On top of Proximity-1, the fer a file by means of an orbital relay. A file may be CCSDS File Delivery Protocol at the transport layer transferred from a landed asset to Earth or visa versa. provides applications the capability of transporting The orbital relay functions as a store and forward node. their data products end to end across the entire space The on-board command and data handling system link either expedited or reliably. manages the data it receives from Earth or the landed Proximity-1 Key Characteristics: Proximity-1 asset, as a file in it’s on-board file management system. In those cases where the lander does not manage data provides standard services for transferring command, as a file, the relay orbiter can accept data not organized telemetry, and radiometric data products across the In- in files e.g., byte streams, CCSDS packet sets, and cre- Situ link. It provides a timing service which includes ate one or multiple files from this data on-board. Once techniques for round trip light time (RTLT) calculation the file is successfully transferred to the orbiter, it and setting remote spacecraft time. It also provides a takes custody of the data (custody transfer), and relays Concepts and Approaches for Mars Exploration 6114.pdf MARS COMMUNICATION PROTOCOLS: G.J. Kazz and E. Greenberg status back to the lander acknowledging its receipt. three phased approach below describes how the bi- Given adequate resource margins on-board the orbiter, directional file transfer concept can be infused into the lander can now delete this data providing storage future Mars missions. The description below uses a space for future data acquisition. simple communications model of a landed asset, an Scenario 2:Multi-Hop Relay (Rover to lander to orbiter relay, and Earth stations as illustrative only. orbiter to Earth) Now a rover enters the environment and transfers its data to the lander. The rover having Phase 1:Expedited CFDP (Deep Space limited computing power and storage does not have the Link)/reliable Proximity-1 Link The objective of this resources to run CFDP. Depending upon the required phase is to relay data collected by the landed asset via completeness of the data transfer, the rover utilizes a reliable Proximity-1 link to an orbiter, store the data either the expedited or the sequence controlled service on-board, and later transmit that data as a file to Earth of Proximity-1. Both the lander and orbiter function as using the expedited features of CFDP. This phase does store and forward nodes. Custody transfer occurs first not require the landed asset to transmit nor store its between the lander and the rover and later between the data as a file. This version of CFDP does not include orbiter and the lander. the automated selective repeat (report) feature. Scenario 3:Point-to-Multi-point (forward link) Phase 2: Expedited CFDP (In-Situ and Deep Within the proximity link environment, an orbiter en- Space)/reliable Proximity-1 Link The objective here is counters multiple landed assets. Assuming the orbiter has only one transceiver, it can simultaneously com- to move the functionality of building the file into the municate to all or a subset of the Mars assets within its landed asset. The orbiter is provided with the function- field of view. By cycling through a set of spacecraft ality of receiving the file and storing it in the on-board IDs during the hailing period, the orbiter can a) broad- data management. As in phase 1, the orbiter transmits cast commands for all Mars assets, or b) multicast the data as a file to Earth using expedited CFDP. commands to a subset of landed assets e.g., all landers, Phase 3: Reliable CFDP (In-Situ and Deep Space)/ or c) poll each landed asset to determine the priority of unreliable Proximity-1 Link. Here the landed asset uses its return link data transfer and once determined the more efficient and reliable QoS (selective repeat choose the asset with the highest priority. The Proxim- methodology) of CFDP to transfer a file to the orbiter ity-1 frame verification rules specify that only data using the expedited QoS of the Proximity-1 link. marked with the called asset’s spacecraft ID or multi- Similarly, for the Deep Space link, CFDP can be run cast address will be accepted by the asset. reliably on top of either CCSDS Packet Telemetry [5] Scenario 4:Time-Sequenced Point-to-Point (return or CCSDS Telecommand [6] Standard to/from Earth. link) Again assuming the orbiter has only one trans- References: [1] Hastrup, R.C. “Mars Network for ceiver, it can time share the return link with multiple Enabling Low-Cost Missions," Fourth IAA Interna- Mars assets based upon a priority scheme. It does this tional Conference on Low-Cost Planetary Missions," by establishing communications with a specific asset IAA-L-0509, Laurel, Maryland, 2-5 May 2000. [2] by hailing it, limiting the period of the data contact to a Consultative Committee on Space Data Systems subset of the total pass time, terminating the link with Proximity-1 Space Link Protocol , CCSDS 211.0-R-2, that asset before hailing the next asset and repeating Red Book Issue 2, Jan. 2000. Available at the process. http://www.ccsds.org/ .[3] Consultative Committee on Scenario 5:Point-to-Point Network This scenario Space Data Systems File Delivery Protocol, CCSDS will require some form of multiple access scheme. 727.0-R-3, Red Book Issue 3, May 1999. Available at Candidates under study at this time are frequency divi- http://www.ccsds.org/ [4] Kazz, G.J. “Application of sion multiple access (FDMA), code division multiple an Extended CCSDS Telecommand Standard for all access (CDMA), and time division multiple access Mars In-Situ Telecommunication Links,” First ESA (TDMA).
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