Test of Neural Network Techniques using Simulated Dual-Band Data of LEO Satellites
AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
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Dual-band, multi-pass simulations of low Earth orbit LEO satellites are used to train a feedforward neural network to recognize different classes of resident space objects RSO. Simulated data allow for a controllable and diverse set of inputs necessary to test our methods, especially at the initial phase of the evaluation, while avoiding the problems and expense associated with real data collection from ground-based facilities. Simulation software is used to generate signatures in two visible bands for satellites exhibiting typical bus-types, materials combinations and methods of stabilization. Orbits and observational parameters are generated from the relevant statistical distribution of the orbital parameters obtained from the Space Surveillance Network, and stabilization is simulated external to the framework of the software used to calculate signatures. We examine various pre-processing schemes that combine temporal, spectral and solar phase angle SPA information from non-glinting signatures into vectors that can be used as inputs for our classifier. A metric that assigns a proxy signal-to-noise ratio to each neural network output is introduced to determine the confidence level of each result.
- Spacecraft Trajectories and Reentry