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Lunar exploration ground sites will enhance the Near Space Network’s communications services

July 23, 2024
in Science
Lunar exploration ground sites will enhance the Near Space Network’s communications services
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Lunar exploration ground sites will enhance the Near Space Network's communications services

LEGS will directly support the Artemis campaign, including the Lunar Gateway, human landing system (HLS), and lunar terrain vehicle (LTV). Credit: NASA

NASA’s LEGS can do more than help Earthlings move about the planet. Three Lunar Exploration Ground Sites, or LEGS, will enhance the Near Space Network’s communications services and support of NASA’s Artemis campaign.

NASA’s Space Communications and Navigation (SCaN) program maintains the agency’s two primary communications networks—the Deep Space Network and the Near Space Network, which enable satellites in space to send data back to Earth for investigation and discovery.

Using antennas around the globe, these networks capture signals from satellites, collecting data and enabling navigation engineers to track the mission. For the first Artemis mission, these networks worked in tandem to support the mission as it completed its 25-day journey around the moon. They will do the same for the upcoming Artemis II mission.

To support NASA’s Moon to Mars initiative, NASA is adding three new LEGS antennas to the Near Space Network. As NASA works toward sustaining a human presence on the moon, communications and navigation support will be crucial to each mission’s success. The LEGS antennas will directly support the later Artemis missions, and accompanying missions such as the human landing system, lunar terrain vehicle, and Gateway.

“One of the main goals of LEGS is to offload the Deep Space Network,” said TJ Crooks, LEGS project manager at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. “The Near Space Network and its new LEGS antennas will focus on lunar missions while allowing the Deep Space Network to support missions farther out into the solar system—like the James Webb Space Telescope and the interstellar Voyager missions.”

Lunar exploration ground sites will enhance the Near Space Network's communications services

The Gateway space station will be humanity’s first space station in lunar orbit as a vital component of the Artemis missions to return humans to the moon for scientific discovery and chart a path for humans to Mars. Credit: NASA

The Near Space Network provides communications and navigation services to missions anywhere from near Earth to 1.2 million miles away—this includes the moon and sun-Earth Lagrange points 1 and 2. The moon and Lagrange points are a shared region with the Deep Space Network, which can provide services to missions there and farther out in the solar system.

The LEGS antennas, which are 66 feet in diameter, will be strategically placed across the globe. This global placement ensures that when the moon is setting at one station, it is rising into another’s view. With the moon constantly in sight, the Near Space Network will be able to provide continuous support for lunar operations.

How it works

As a satellite orbits the moon, it encodes its data onto a radio frequency signal. When a LEGS antenna comes into view, that satellite (or rover, etc.) will downlink the signal to a LEGS antenna. This data is then routed to mission operators and scientists around the globe who can make decisions about spacecraft health and orbit or use the science data to make discoveries.

The LEGS antennas are intended to be extremely flexible for users. For LEGS-1, LEGS-2, and LEGS-3, NASA is implementing a “dual-band approach” for the antennas that will allow missions to communicate using two different radio frequency bands—X-band and Ka-band.

Lunar exploration ground sites will enhance the Near Space Network's communications services

The LEGS antennas (similar in appearance to this 20.2-meter CPI Satcom antenna) will be placed in equidistant locations across the globe. This ensures that when the moon is setting at one station, it will be rising into another’s view. With the moon constantly in sight, NASA’s Near Space Network will be able to support approximately 24/7 operations with moon-based missions. Credit: CPI Satcom

Typically, smaller data packets—like telemetry data—are sent over X-band, while high-resolution science data or imagery needs Ka-band. Due to its higher frequency, Ka-band allows significantly more information to be downlinked at once, such as real-time high-resolution video in support of crewed operations.

Further LEGS capacity will be sought from commercial service providers and will include a “tri-band approach” for the antennas using S-band in addition to X- and Ka-band.

The first LEGS ground station, or LEGS-1, is at NASA’s White Sands Complex in Las Cruces, New Mexico. NASA is improving land and facilities at the complex to receive the new LEGS-1 antenna.

The LEGS-2 antenna will be in Matjiesfontein, South Africa, located near Cape Town. In partnership with SANSA, the South African National Space Agency, NASA chose this location to maximize coverage to the moon.

South Africa was home to a ground tracking station outside Johannesburg that played a role in NASA’s Apollo missions to the moon in the 1960s. The agency plans to complete the LEGS-2 antenna in 2026. For LEGS-3, NASA is exploring locations in Western Australia.

These stations will fully complement the existing capabilities of the Near and Deep Space Networks and allow for more robust communications services to the Artemis campaign.

Citation:
Lunar exploration ground sites will enhance the Near Space Network’s communications services (2024, July 23)
retrieved 23 July 2024
from https://phys.org/news/2024-07-lunar-exploration-ground-sites-space.html

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part may be reproduced without the written permission. The content is provided for information purposes only.

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