The Optimization Design of Sub-Regions Scanning and Vibration Analysis for Beaconless Spatial Acquisition in the Inter-Satellite Laser Communication System

Abstract

We mainly report an efficient approach to optimize the design of beaconless spatial laser acquisition. In order to analyze the influence of vibration environment on the beaconless spatial acquisition, a demonstration of an efficient method will be presented to simulate the level of satellite platform vibration. An important power spectral density (PSD) model of satellite platform vibration used by the European Space Agency is introduced. Then through LABVIEW, a simulated vibration waveform is generated, and the simulated PSD has a basic consistency with the in-orbit measurement spectral line, referring to the design of the filter, generating the Gaussian white noise sequence, filtering the pseudorandom signal and the whole processing procedure of parameter matching. The variation interval of the vibration amplitude is from −100 to 40 μrad. Then, the model of beaconless acquisition is proposed, which uses the spiral scan pattern, laser with a divergence angle of 80 μrad scan in an uncertainty cone (UC), and also the scan coupled with the simulated vibration is given. Through the beaconless acquisition program, the vibration is suppressed between −10.7 and 5.9 μrad; when the overlap factor is selected as 10%, it does not produce any leakage scanning area. It can be used for a wide variety of platforms. This new method will be good for analysis and test of beaconless spatial acquisition algorithm. Finally, the description of acquisition duration, which mainly includes the fast steering mirror spiral scan and the mechanical rotary table step scan, is introduced. And the corresponding optimal selection method of sub-region is proposed; the design of 1.6-mrad scanning pattern with 7 × 7 sub-regions in the 8-mrad acquisition UC is given. Through the actual measurement, the acquisition time is 18.21 s, the tracking error is better than 0.4 μrad.

Impact of spectral noise shape and correlations of laser beam jitter on acquiring optical links in space

“…Based on an available jitter model for the SILEX mission, the analysis in [19] uses a colored noise spectrum with constant spectral density up to a roll-off frequency f r =1 Hz, from where it drops as 1/ f 2 towards higher frequencies:…”

Probabilistic model for spatially acquiring optical links in space under influence of band-limited beam jitter

“…During the acquisition the satellite platform vibrates and leads to jitter with a variance of σ 2 n . For the following analysis, the one-sided Power Spectral Density (PSD) of the jitter spectrum specified by ESA for the SILEX platform is assumed that is given by [7,18]…”

Target Tracking and Ranging Based on Single Photon Detection

“…This scanning method scans from the high probability position to the least likely location and dwells on each spot for a constant duration. Moreover, the scanning capture efficiency is relatively high [28][29][30][31]. The geometry diagram of spiral scanning is shown in Figure 4.…”