Multi-parameter influenced acquisition model with an in-orbit jitter for inter-satellite laser communication of the LCES system

Abstract

With the development of large low earth orbit (LEO) communication constellations, the efficiency of laser inter-satellite link (ISL) establishing become the bottleneck for subsequent large-scale launch and rapid networking applications of LEO communication constellations. Hence, we establish the pointing jitter error structure of LEO communication experiment satellites (LCES) system. The error structure can be used to trace the source of errors and evaluate the in-orbit jitter. And we derive an analytical expression of the acquisition probability density function (PDF) which comprehensively considering the influence of the scanning region, the pointing jitter error, the overlap factor and the in-orbit jitter error. The multi-parameter influenced acquisition model is validated by Monte Carlo (MC) simulations and semi-physical tests. The results reveals that the multi-parameter influenced acquisition model can be used to guide the in-orbit ISL establishing.

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

“…However, as can be seen in Fig. 2, there is no noticeable difference between the results of the much more involved approach of [12](red crosses) and the original model of [16] (blue line). The latter model yields accurate results, if the width of the uncertainty distribution σ uc is larger than D t , which is the case for all conceivable mission scenarios.…”

“…For optical link acquisition, the scanning beam of SC 1 is typically moved along an Archimedean search spiral with constant angular velocity, covering the uncertainty distribution of the receiving SC2 from the center to the maximum scan radius (see e.g. [6,[8][9][10][11][12]). Considering the Gaussian profile of the uncertainty distribution (see section 2A), the regions of higher probability are scanned before those of lower probability, making the Archimedean spiral a very efficient choice.…”

“…Therefore, the total probability of failure P f ail can be found by integrating the conditional probability of missing the scanning beam for a given offset x t from track n over a uniform density in between the two tracks [16]. A recent paper [12] suggested to improve the accuracy of the calculation by piecewise integration of the conditional probability over all track pairs, density weighted by the exact shape of the uncertainty distribution in each segment. However, as can be seen in Fig.…”

“…Discussing the model predictions for realistic parameters in section 3A, it becomes apparent that for fast scan speeds the emerging correlations may reduce P f ail by orders of magnitude, which is a dominating effect that is not accounted for by previous analytical models. Remarkably [16] (blue line), the modified 2-track model [12] (red crosses), and the "N-track model" [14] for N = 7 (black line).…”

178-W picosecond green laser with active beam-pointing stabilization

“…In addition, beam jitter is an issue that must be addressed to extend the application of lasers to moving platforms such as aircraft, ships, vehicles, and satellites [27,28]. Beam jitter caused by engine vibration, atmospheric turbulence, and attitude changes severely limits the pointing performance of laser beams on moving platforms [29].…”