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Deploying and Demonstrating Navigation Aids on the Lunar Surface


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Deploying and Demonstrating Navigation Aids on the Lunar Surface

ln-1-1.jpg?w=1175

PROJECT

Lunar Node-1 (LN-1)

SNAPSHOT

NASA is developing lunar navigation beacons to be deployed on spacecraft or the lunar surface to aid in localization and help future space vehicles determine position, velocity, and time to high accuracy.

ln-1-1.jpg?w=1175
The Lunar Node-1 payload in the test chamber at the Deep Space Network’s  Development and Test Facility (DTF)-21 radio frequency (RF) compatibility testing lab. The large block seen in the image is the antenna hat used to collect RF energy for ground testing and integration.

“Are we there yet?” is a constant question on any journey. As humanity expands its presence on, near, and around the Moon, new systems are needed to provide navigation signals similar those provided by the Global Positioning System (GPS) on Earth. To enable this capability, NASA is supporting research on a range of sensors, architectures, and techniques for providing reference signals to help spacecraft and humans find their way.

Lunar Node 1 (LN-1) is an S-band navigation beacon for lunar applications that was recently designed and built at Marshall Space Flight Center (MSFC). As part of NASA’s Commercial Lunar Payload Services (CLPS) initiative, this beacon is scheduled to be delivered to the Moon’s surface on Intuitive Machine’s NOVA-C lunar lander on the IM-1 mission in early 2024.

Left: a closeup of a metallic cube topped by a metallic platform mounted to a flat white structure. Wires protrude from the mounted cube. Right: the same metallic cube and platform shown from a further viewpoint; the white structure they are mounted upon is covered with numerous wires.
The Lunar Node-1 flight payload installed on the Intuitive Machines NOVA-C lander for the IM-1 mission. The payload is mounted near the top deck of the vehicle to provide a clear field of view for its antenna back to Earth.
Image Credit: Intuitive Machines/Nick Rios

During this mission, LN-1’s goal will be to demonstrate navigation technologies that can support local surface and orbital operations around the Moon, enabling autonomy and decreasing dependence on heavily utilized Earth-based communication assets like NASA’s Deep Space Network demonstrate these capabilities, LN-1’s design leverages CubeSat components as well as the Multi-spacecraft Autonomous Positioning System (MAPS) algorithms, which enable autonomous spacecraft positioning using navigation measurements. In addition to demonstrating the MAPS algorithms, LN-1’s radio will also be used to conduct pseudo-noise (PN)-based, one-way, non-coherent ranging and Doppler tracking to provide alternate approaches and comparisons for navigation performance. To provide a real-time solution similar to GPS, but in the lunar environment, multiple references must be in view of users at the same time. As this future lunar communication network is deployed, LN-1 hardware and capabilities could be part of a much larger infrastructure.

Over the course of the transit to the Moon from Earth and during its the nominal lunar surface operations, LN-1 will broadcast its state and timing information back to Earth. Once it lands on the lunar surface, the payload will enter into a 24/7 operational period, and will also provide a navigation reference signal back to Earth.  To validate LN-1 capabilities, DSN ground stations will be used to capture measurements and measure performance. Upon reception of the LN-1 data, high-accuracy packet reception timestamps will be used (along with atmospheric data for induced delays) to assess a ranging observation. This data will be captured during multiple passes to compute a navigation state of the payload during the mission. The LN-1 team is also partnering with other NASA researchers to collect Very Long Baseline Interferometry observations of the navigation signals as an independent truth reference.

An image of the moon with a cartoon payload on the surface. Blue rectangles depicting the elements in the data paths are connected by black arrows labeled according to the type of data being transferred between elements.
Concept of Operations. This diagram shows the dual data paths being exercised by the LN-1 payload. The primary operational command and data handling is done through a hardwire connection between the payload and the host lander. Using its onboard transmitter, LN-1 will transmit its navigation signals independently, providing the lander’s current time and state information via both a reference one-way PN solution as well as the transmission of MAPS packets.

The compact size of the LN-1 payload can be seen in the LN-1 CAD models in the figures below. The primary LN-1 structure is approximately 175x220x300 cm in volume with a mass of approximately 2.8 kg. The dominating feature of the design is the large top surface, which is a radiator. The hot environment on the lunar surface, combined with the heat generated by the LN-1 radio while transmitting, require the LN-1 design to incorporate a radiator to dissipate heat during operation so that a clean interface with the host vehicle will be maintained. While the LN-1 payload is not designed to survive the lunar night, it uses a modular design that could be integrated into a variety of host vehicles; if adequate power generation/storage were provided, the design may be able to offer long-term operation at any lunar landing site.

Left: a gray platform with a triangular structure mounted atop a gray cube. One side of the cube is cut away to show wiring and circuitry inside the cube. Right: the same structure shown rotated to show the elements inside the cube from a different angle.
Interior views of LN-1. These images provide a look inside the payload showing the primary components: radiator hat, antenna mount adapter, SWIFT SL-X transmitter, FPGA-based controller board, and power conditioning electronics.
A laboratory containing several large tubes with protruding wires and tubes. The door to the tube in the center is open, showing the equipment inside the tube.
LN-1 successfully passed vibration, electromagnetic interference testing, and thermal vacuum testing at Marshall Space Flight Center in 2020 and 2021.

After completion and delivery of the LN-1 payload, testing with the planned operational ground stations began. This testing included RF compatibility testing between the DSN and the LN-1 payload as well as tests of the data flows between the DSN and MSFC’s Huntsville Operations Support Center. Performed at the DSN’s Development and Test Facility (DTF)-21 facility in early 2021, these tests successfully verified RF compatibility between DSN and the LN-1 payload. Specifically, the tests showed that the DSN can receive S-band telecommunication signals in all the planned operational modes required to process telemetry and ranging data from LN-1.

A man seated at a desk wearing a lab coat and mask, working on a computer.
LN-1 Principal Investigator, Evan Anzalone, performing RF Compatibility Testing at DTF-21. This testing was important to characterize the stability of the one-way ranging tone and demonstrate integration with the DSN ground network for flight operations. The LN-1 team is currently setting up the flight spare with a flight-matching radio and is preparing to conduct another round of testing to capture long-term stability data with ground receivers to demonstrate improved capability with improved clocks and signal generation algorithms.

In the future, this new technology and the MAPS algorithms demonstrated by LN-1 could enable autonomous navigation for lunar assets. As NASA invests in communication and navigation infrastructure around, near, and on the Moon, the LN-1 team continues to develop future iterations of the navigation beacon to support broad lunar surface coverage. The team is currently maturing the capabilities of the payload in preparation for continued laboratory assessments and field demonstrations using updated navigation signals as defined for LunaNet. Three key capabilities will be the focus of the development of a follow-on payload to LN-1:

  • Demonstration of inter-spacecraft navigation, providing support to operational vehicles in lunar orbit by acting as a fixed ground reference
  • The capability to survive the lunar night onboard the payload to demonstrate technologies needed for a long-term navigation beacon
  • Maturation of signal to match the Augmented Forward Signal standard as defined in the LunaNet Interoperability Specification for integration, operation, and compatibility with other planned NASA assets and infrastructure

PROJECT LEAD

Dr. Evan Anzalone and Tamara Statham, NASA Marshall Space Flight Center (MSFC)

SPONSORING ORGANIZATION

NASA-Provided Lunar Payloads Program

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