17/10/2022
Space Surveillance and Tracking (SST):
To avoid collisions with space debris, the orbits of objects in space must be known. This requires a system of sensors comprising, typically, radars, telescopes and laser-ranging stations, and a data center to process the acquired observation data.
The data generated by an SST system can be used to predict hazards to operational spacecraft, such as a potential collision with a debris object, or to infrastructure on the ground, such as from a reentering object.
Any SST system can be considered a ‘processing pipeline’ to process observational data acquired by sensors – the telescopes, radars or laser-ranging stations – and provide derived applications and services, typically comprising collision warnings.
The core of the SST segment is an updated catalogue, which contains information about the detected objects, such as their orbits and physical properties. To produce such a catalogue, several steps must be executed:
- Check to see if the detected object is already in the catalogue (correlation)
- Determine (if a new object is detected) or update (for an object already in the catalogue) the orbit from the sensor data (orbit determination)
- Monitor the catalogue data to periodically schedule new observations
Once a catalogue of all detectable objects that orbit Earth has been created and is being maintained, different services can be provided:
-Conjunction predictions: issuing warnings for potential collisions (a 'conjunction event' is a close approach between two objects) between operational spacecraft and space debris
-Fragmentation detection: determine when a fragmentation event has occurred, either due to a collision or due to an explosion (possibly caused by a discarded rocket stage that still contains fuel or charged batteries) and estimate the evolution of the fragment cloud and the associated risks
-Reentry prediction: determine the orbital lifetime and compute the reentry date and trajectory
DarkStar Aerospace operates SST systems for Space Situational Awareness (SSA):
-We operate a Ground & Tracking Station in the EU, this has the ability to communicate with satellites, track, range, and analyse their orbits.
-Soon, we will open another Ground & Tracking Station in the MENA region.
-Our DSA-MSI will be able to conduct advanced observations & analysis of fast moving space debris, even smaller debris which is more difficult to track.
-We are developing a new sensor system that will be able to observe LEO/GEO with new methodology, to provide advanced SSA. Currently, our Engineering Team are calibrating the sensor system against known debris objects & materials, so when it is placed on a small satellite constellation, it will be able to detect, track, and analyse debris far faster & more accurately, for greater awareness & collision avoidance.