NFIRE and TerraSAR-X laser communication tests: ground- breaking results for inter-satellite and space-to-ground links

Smutny, Berry; Fields, R. A.; Lunde, C.; Skoog, J.; Mühlnikel, Gerd; Sterr, U.; Meyer, Rolf; Wandernoth, B.; Kozlowski, D.A.; Ranere, M.; Luna, Joseph J.; Czichy, Reinhard H.

doi:10.1049/cp.2009.1211

Cited by 2 publications

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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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Section: Introductionmentioning

confidence: 99%