urn:nasa:pds:context:instrument:rss.maven 1.0 1.8.0.0 Product_Context 2017-10-04 1.0 Original version. urn:nasa:pds:context:instrument_host:spacecraft.maven::1.0 instrument_to_instrument_host urn:nasa:pds:maven.rose.raw:document:rsr instrument_to_document The version referenced is Rev. A, dated 2001, which should be adequate for most users. Rev. B included minor content/format changes. Subsequent versions (now at Rev. F) have been issued solely to improve the documentation. Status of Revs. B and C is unknown; Revs. D-F have not been cleared for ITAR release. urn:nasa:pds:maven.rose.raw:document:dlf instrument_to_document This document must be used in conjunction with maven_rose_rsr. It describes variations in RSR tuning that allow better real-time frequency tracking of the downlink carrier when occultations are observed in two-way mode. For MAVEN ROSE the RSR tuning is adjusted at millisecond cadence rather than at (nominal) one second cadence. Asmar, S. W., N. A. Renzetti, The Deep Space Network as an Instrument for Radio Science Research, JPL Publication 80-93, Rev. 1, 15 April 1993. Available at https://ntrs.nasa.gov/search.jsp?R=19950015039 A description of the technical capabilities of the NASA Deep Space Network in the mid 1990s as they might be applied to radio science observations conducted with spacecraft. The report also provides an overview of six types of radio science investigations conducted using the DSN (radio propagation and occultation, solar corona and solar wind, celestial mechanics, gravitational waves, relativistic time delay, and spacecraft deceleration in cometary comae). Although somewhat dated in technical details, the overview remains useful since the antenna, transmitter, and receiver performance has changed little since 1993. Deep Space Mission Systems (DSMS) Telecommunications Link Design Handbook (810-005), Jet Propulsion Laboratory, Pasadena, CA. Available at https://deepspace.jpl.nasa.gov/dsndocs/810-005/ A modular document that provides technical information useful in designing telecommunications interfaces and estimating their performance. It provides data on 26-, 34-, and 70-m antennas; solar, atmospheric, and environmental effects; frequency assignments; doppler, ranging, commanding, telecommunications, interferometry, and open-loop receiving subsystems; and geometry, coverage, calibration, and test support. A glossary is also included. The modular organization facilitates updates, the most recent being in February 2017. Mars Reconnaissance Orbiter Telecommunications, Jet Propulsion Laboratory, Pasadena, CA. September 2006. Available at https://deepspace.jpl.nasa.gov/DPSummary/summary.html The referenced document provides technical details about the telecommunications subsystem flown on Mars Reconnaissance Orbiter. The subsystem flown on MAVEN is similar. Differences include a 2-meter parabolic reflector high-gain antenna on MAVEN (rather than the 3-m offset parabolic reflector with subreflector on MRO) and no special on-board oscillator on MAVEN, compared with an ultra-stable oscillator on MRO. The minimum downlink data rate for MAVEN was 271-550 kb/s whereas it was 500 kb/s for MRO. Radio Science Instrument Radio-Radar In two-way mode a DSN ground station transmits an uplink carrier at about 7.2 GHz, referenced to the local frequency and timing standard (FTS), which ensures greatest stability. The uplink signal is received at the spacecraft; there are small phase changes in the signal if it has passed through the atmosphere/ionosphere of Mars. The spacecraft telecommunication subsystem locks to the uplink signal and echoes it back at about 8.4 GHz. Additional phase changes are imposed if the downlink signal passes through Mars atmosphere/ionosphere. The downlink signal is received by the DSN ground station using its open-loop Radio Science Receiver, which is referenced to the FTS.