Collision Avoidance Operations of DEIMOS-1 and DEIMOS-2 Missions

A collision risk mitigation strategy is proposed for DEMOS-1 and DEIMOS-2 in order to ensure mission survivability, although taking into account several constraints coming from the platform. Due to the fact that both satellites are equipped with low-thrust electric propulsion systems, the achievable delta-V is too low to be able to separate the satellite enough from the incoming object along the radial direction. The strategy consists of a single collision avoidance maneuver that has to be made several hours before the Time of Closest Approach in order to achieve the suitable in-track separation from the expected collision location. The propulsion system characterization provides a deeper insight of that. The internal procedure implements a constant monitoring of hazardous events, assessing conjunction characteristics and sharing trajectory information with the 18th SPace Control Squadron (SPCS). It provides a scheme to be followed when meeting certain conditions, mainly the time to closest approach and collision probability. In this process, the automatic generation of risk assessment reports and reception of alarms by email are essential for the Flight Dynamics Team to be warned of new important events at any time of the day. The safety of the post-maneuver trajectory must also be granted by analyzing the close approaches foreseen after any orbit control maneuver and before executing it. This paper goes through the risk mitigation procedure especially dedicated to Deimos Imaging's low-thrust satellites when maneuvering for collision avoidance or orbit control purposes. I. Nomenclature Delta-V= velocity variation PC = collision probability as computed by Deimos Imaging

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“…In Ref. [1] a detailed description of the analysis of a collision event in terms of geometry is given.…”

Section: A Single Maneuvermentioning

confidence: 99%

Collision Risk Mitigation for Deimos Imaging Low Thrust Satellites

Mazzoleni¹,

Luengo²,

Castillo³

et al. 2018

2018 SpaceOps Conference

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Formal Specification and Analysis of Spacecraft Collision Avoidance Run Time Assurance Requirements

Hobbs

Davis²,

Wagner³

et al. 2021

2021 IEEE Aerospace Conference (50100)

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Evolution of Operations Throughout DEIMOS-1 Mission

Álvarez¹,

Bueno²,

Carballo³

et al. 2018

2018 SpaceOps Conference

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Deimos Imaging (Spain), a subsidiary of UrtheCast Corp. (Canada), is a private Spanish company specialized in the operation and commercial exploitation of Earth Observation systems. Currently, Deimos Imaging owns and operates the DEIMOS-1 and DEIMOS-2 satellites. DEIMOS-1 is the first Spanish Earth Observation satellite, providing 22 m resolution, 3 band imagery (Red, Green and Near Infrared) with a very wide (650 km) swath from its 650 km of altitude. The Operations Team is in charge of the satellite's control and mission planning activities, being also responsible for assessment duties related to Flight and Ground Segment. Two Ground Stations (one polar located at Svalbard, Norway, and one local in Boecillo, Spain) allows at least one contact every orbit. Throughout its almost 9 years of mission, DEIMOS-1 operations have experienced a great evolution to reach the current state of stability and automation. This evolution has been reflected in both Ground Segment and Flight Segment. Ad-hoc software tools, improvements and procedures have been developed and applied in order to satisfy operations needs and increase the efficiency of the mission.

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Collision Avoidance Operations of DEIMOS-1 and DEIMOS-2 Missions

Cited by 4 publications

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Collision Risk Mitigation for Deimos Imaging Low Thrust Satellites

Collision Risk Mitigation for Deimos Imaging Low Thrust Satellites

Formal Specification and Analysis of Spacecraft Collision Avoidance Run Time Assurance Requirements

Evolution of Operations Throughout DEIMOS-1 Mission

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