TY - JOUR
T1 - Laser back scatter
T2 - Limitation to higher repetition rate [kHz] Satellite Laser Ranging system
AU - Iqbal, Farhat
AU - Kirchner, G.
AU - Koidl, F.
AU - Leitgeb, Erich
N1 - Funding Information:
We acknowledge the Austrian Academy of Science for providing a placement and Higher education commission of Pakistan to fund this study.
Publisher Copyright:
© 2021 The Authors
PY - 2021/1
Y1 - 2021/1
N2 - Satellite laser ranging (SLR) with higher repetition rate is the recent trend for its various advantages. Laser backscatter (coincidence between recently transmitted pulses and received pulses near the detector) is found to be a constraint for the repetition rates higher than 20 kHz, due to, overlapping with photons returning from a satellite with the present constellation of most of the SLR systems. Such an overlap occurs at every 75 km satellite distance change at 2 kHz repetition rate, and remains for about 7.5 km; for a 20 kHz system however, it will occur after every 7.5 km and remains for 7.5 km, resulting in constant backscatter overlap – leaving no chance to avoid it. The resulting noise is 5 times more than before causing a serious problem in detection and lowers the signal to noise ratio of the overall SLR system. However, decreasing energy per shot at higher repetition rates – assuming a constant power laser – the resulting backscatter may decrease fractionally.
AB - Satellite laser ranging (SLR) with higher repetition rate is the recent trend for its various advantages. Laser backscatter (coincidence between recently transmitted pulses and received pulses near the detector) is found to be a constraint for the repetition rates higher than 20 kHz, due to, overlapping with photons returning from a satellite with the present constellation of most of the SLR systems. Such an overlap occurs at every 75 km satellite distance change at 2 kHz repetition rate, and remains for about 7.5 km; for a 20 kHz system however, it will occur after every 7.5 km and remains for 7.5 km, resulting in constant backscatter overlap – leaving no chance to avoid it. The resulting noise is 5 times more than before causing a serious problem in detection and lowers the signal to noise ratio of the overall SLR system. However, decreasing energy per shot at higher repetition rates – assuming a constant power laser – the resulting backscatter may decrease fractionally.
KW - Higher repetition rate
KW - Noise
KW - Retro reflectors
KW - Satellite laser ranging
UR - http://www.scopus.com/inward/record.url?scp=85100398361&partnerID=8YFLogxK
U2 - 10.1016/j.geog.2020.08.002
DO - 10.1016/j.geog.2020.08.002
M3 - Article
AN - SCOPUS:85100398361
SN - 2589-0573
VL - 12
SP - 48
EP - 53
JO - Geodesy and Geodynamics
JF - Geodesy and Geodynamics
IS - 1
ER -