Deep Space Communications by Jim Taylor

By Jim Taylor

A number of a few of the Jet Propulsion Laboratory's house missions chosen to symbolize the planetary communications designs for a development of assorted varieties of missions

The textual content makes use of a case learn method of exhibit the communications hyperlink functionality because of the planetary communications layout built through the Jet Propulsion Laboratory (JPL). this can be comprehensive in the course of the description of the layout and function of six consultant planetary missions. those six situations illustrate development via time of the communications system's services and function from Seventies expertise to the latest missions. The six missions mentioned during this booklet span the Voyager for fly-bys within the Seventies, Galileo for orbiters within the Eighties, Deep house 1 for the Nineties, Mars Reconnaissance Orbiter (MRO) for planetary orbiters, Mars Exploration Rover (MER) for planetary rovers within the 2000s, and the MSL rover within the 2010s.

Deep house Communications:

  • Provides an outline of the Deep house community and its capabilities
  • Examines case experiences to demonstrate the development of method layout and function from project to project and gives a extensive assessment of the missions platforms described
  • Discusses genuine flight venture telecom functionality of every system

Deep house Communications serves as a reference for scientists and engineers drawn to communications structures for deep-space telecommunications hyperlink research and layout control.

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Deep Space Communications

A suite of a few of the Jet Propulsion Laboratory's house missions chosen to symbolize the planetary communications designs for a development of assorted forms of missions The textual content makes use of a case learn method of express the communications hyperlink functionality due to the planetary communications layout constructed by way of the Jet Propulsion Laboratory (JPL).

Additional resources for Deep Space Communications

Sample text

In the second design control table, x‐percentile inclement weather is assumed. What is meant by “x‐percentile” weather is that with x percent probability a pessimistic assumption is being made about weather effects; moreover, with (100 – x) percent probability an optimistic assumption is being made. As an example, 95‐percentile means that 95 percent of the time the degradation due to weather is less than predicted, while 5 percent of the time the weather ­degradation is worse.  The design procedure is described here.

2‐6) where Pc = portion of received power in the residual carrier, and BLO = one‐ sided threshold loop noise bandwidth. Here, Pc is calculated from PR using the modulation indices of the link and depends on the type of modulation used (see Chapter 5 of Ref. 2). The above definition of carrier margin was chosen because a phase‐locked loop receiver loses lock when Pc drops below 2BLON0 watts (W) (see Chapter 3  is calculated as of Ref. 2). Thus, Pc = 2BLON0 defines carrier threshold. 2‐7) and represents the number of decibels the received residual carrier is above carrier threshold.

Each DSCC contains one 70‐meter (m) and from two to five 34‐m antennas. There are two types of 34‐m antennas. The first is the so‐called high efficiency (HEF) antennas that have their feed, low‐noise amplifiers, and transmitter located on the tilting structure of the antenna. These antennas were named when a less‐efficient 34‐m antenna was in use by the DSN and the name has survived. The efficiency of all DSN 34‐m antennas is now approximately the same. The second type of Chapter 2 The Deep Space Network: A Functional Description17 34‐m antenna is the beam waveguide (BWG) antenna where the feeds, low‐ noise amplifiers and transmitters are located in a room below the antenna structure and the radio frequency energy is transferred to and from the antenna surface by a series of mirrors encased in a protective tube.

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