Beaconless acquisition for ISL and SGL, summary of 3 years operation in space and on ground

Sterr, U.; Gregory, Mark A; Heine, F.

doi:10.1109/icsos.2011.5783704

Cited by 25 publications

(9 citation statements)

References 1 publication

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“…In one extreme, if the width of the auto-correlation function is larger than the time of one full spiral revolution, this correlates fluctuations between two adjacent tracks and significantly increases the probability of detection. This condition is the typical operational regime of optical communication terminals with a fast beam-steering mirror, large beam intensities in the far field, and correspondingly short integration times [12,14]. In the other extreme, if the width of the auto-correlation is smaller than the time it takes for the beam to sweep past the location of the receiving SC, the integration windows within this period become uncorrelated, which also increases the detection probability.…”

Section: B Previous Models and Scope Of This Papermentioning

confidence: 99%

“…This is similar to the case of gravitational wave observatories [7], where the very large distance between SC leads to similarly weak powers, although the divergence angle is about 50 times smaller, owing to the much larger telescope size. The parameters of mission scenario (M2) were mostly extracted from [8] and correspond to a typical optical communication terminal in space, such as discussed in [8,12,14], where received powers are between 3 and 6 orders of magnitude higher and integration times correspondingly much shorter.…”

Section: B Reference Mission Parametersmentioning

confidence: 99%

“…This is generally accounted for by the tracking system of the scanning SC which receives updated ephemeris of both SC before starting acquisition and estimates the required change of pointing due to their orbital evolution accordingly. Knowledge errors in the initial conditions, such as the relative SC velocity vectors, lead to drifts of the receiving SC in the uncertainty plane seen by the scanning SC [14]. For example, a radial velocity knowledge error of v r leads to a displacement of the SC in the uncertainty plane of d = v r • 2πR 0 /γ during one spiral revolution at a radial distance R 0 .…”

Section: Beam Driftmentioning

confidence: 99%

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

Hechenblaikner¹

2022

Appl. Opt.

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We investigate how the probability of acquiring an optical link between a scanning and a target spacecraft depends on the spectral shape, power and dimensionality of the beam jitter, as well as on the choice of detector integration time, beam detection radius and scan speed. For slow scans and long integration times, the probability of failure (Pfail) is determined by the integrated jitter power up to a critical frequency, which we verify by comparing the results of an analytical model to those of Monte Carlo simulations. Jitter above the critical frequency leads to a loss of correlation between integration windows and decreases Pfail for both, 1d (radial) and 2d (radial and tangential) jitter, as long as the RMS jitter amplitude does not exceed the beam diameter. In the opposite limit of fast scans and short integration times, emergent correlations between jitter fluctuations on two adjacent scanning tracks also decrease Pfail. The analytical model is additionally used to assess the effect of multiple overlapping tracks and the impact of target drifts in the uncertainty plane.

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Section: B Previous Models and Scope Of This Papermentioning

confidence: 99%

Section: B Reference Mission Parametersmentioning

confidence: 99%

Section: Beam Driftmentioning

confidence: 99%

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

Hechenblaikner¹

2022

Appl. Opt.

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“…In such terminals, the ATP system splits part of the light beam from the signal beam as the beacon light to detect the angle of the incidence light. The signal beam energy obtained by the on-board terminal remains unchanged, but in order to ensure communication Sensors 2020, 20, 5649 2 of 14 quality, the ATP system will not separate too much beam energy from the signal beam, so the energy of the beacon light entering the ATP system is greatly reduced [7][8][9]. How to perform high-precision spot position detection under extremely low signal-to-noise ratio (SNR) is a problem that must be faced.…”

Section: Introductionmentioning

confidence: 99%

TRC-Based High-Precision Spot Position Detection in Inter-Satellite Laser Communication

Guo

et al. 2020

Sensors

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Inter-satellite laser communication (Is-OWC) is one of the main space optical communication technologies currently studied in various countries. In recent years, a kind of Is-OWC communication terminal without independent beacon light has appeared. Such terminals do not have a separate beacon laser with a large divergence angle, but use a narrower communication beam to complete space capture and tracking. Therefore, the energy of the light beam divided by the acquisition, tracking, and aiming (ATP) system is greatly reduced. How to perform high-precision spot position detection under extremely low signal-to-noise ratio (SNR) is a problem that must be faced. Aiming to resolve this problem, this article proposes to use a cosine signal to modulate the intensity of the signal light, so as to convert the problem of detecting a weak light signal into the problem of detecting a line spectrum signal. The authors used the time reversal convolution (TRC) algorithm with a window function to suppress noise and enhance the spectrum line, so as to accurately detect the amplitudes of the weak photocurrents. Finally, by calculating the ratio of the photocurrent amplitude values, the precise spot position is obtained. In the experiment, when the output SNR of the four-quadrant detector (QD) is as low as −17.86 dB, the proposed method can still detect the spot position and the absolute error is limited within 0.0238 mrad.

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“…In a beaconless spatial acquisition process, each LCT scans sequentially its uncertainty cone with its highly collimated communications laser beam and aligns its optical axis perpendicularly to the received optical wavefront, based on the optical signal detected by its quadrant photodiode. This Master/Slave sequence is described in detail in [9]. An overview is summarized in Fig.…”

Section: The Beaconless Spatial Acquisition Processmentioning

confidence: 99%

The ESA's optical ground station for the EDRS-A LCT in-orbit test campaign: upgrades and test results

Perdigués¹,

Sodnik²,

Hauschildt

et al. 2017

International Conference on Space Optics — ICSO 2016

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Beaconless acquisition for ISL and SGL, summary of 3 years operation in space and on ground

Cited by 25 publications

References 1 publication

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

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

TRC-Based High-Precision Spot Position Detection in Inter-Satellite Laser Communication

The ESA's optical ground station for the EDRS-A LCT in-orbit test campaign: upgrades and test results

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