Hayabusa2 LIDAR level 1 data product: laser link experiment

Overview

This website provides Hayabusa2 LIDAR laser link experiment data. For details of the experiment, see Noda et al. (2017), Laser Link Experiment with the Hayabusa2 Laser Altimeter for In-flight Alignment Measurement, Earth, Planets and Space, doi:10.1186/s40623-016-0589-8

Citation

When you publish your own work based on the Hayabusa2 LIDAR laser link experiment data, please refer to the following paper(s):
  1. Mizuno, T., Kase, T., Shiina, T. et al., Space Sci. Rev. (2016), doi:10.1007/s11214-015-0231-2
  2. Noda, H., Kunimori, H., Mizuno, T. et al., Earth, Planets and Space (2017), doi:10.1186/s40623-016-0589-8

Files


Laser link mode:
  1. hyb2_ldr_l1b_laser_link_exp_aocsm_20151211_opt.csv
  2. hyb2_ldr_l1b_laser_link_exp_aocsm_20151215_opt.csv
  3. hyb2_ldr_l1b_laser_link_exp_aocsm_20151218_opt.csv
  4. hyb2_ldr_l1b_laser_link_exp_aocsm_20151219_opt.csv
Range mode:
  1. hyb2_ldr_l1b_laser_link_exp_aocsm_20151219_rng.csv

Format description

  1. Laser link mode
    column 1: On board time in UTC (YYYY-MM-DDTHH:MM:SS.SSSSSS) The time when a command of the LIDAR was issued is shown as UTC time for valid data. In the laser link mode, it corresponds to the time when the LIDAR started waiting for the laser pulses from a ground laser station.
    column 2: Stop1 timing The LIDAR has a 17-bit counter with frequency of approximately 300 MHz (3.3 ns per bit) for ranging. In the laser link mode, the laser diode is triggered by first laser reception, then after a period of laser excitation, shown as gStart timingh, a laser pulse is emitted from the LIDAR. Stop1 timing shows a raw counter value of the interval between first detected pulse and laser diode trigger time in this mode.
    column 3: Stop2 timing In the laser link mode, the LIDAR can receive up to two laser shots from the ground station during 1-sec waiting period. Stop2 timing shows the interval between two received pulses.
    column 4: Start timing Start timing shows a raw counter value of the interval between laser diode trigger time and laser emission after laser diode excitation. Therefore, the internal delay in the instrument is expressed as Stop1 timing + Start timing.

  2. Range mode
    column 1: On board time in UTC (YYYY-MM-DDTHH:MM:SS.SSSSSS) The time when a command of the LIDAR was issued is shown as UTC time for valid data. In the range mode, this time corresponds to the laser shot time of the LIDAR.
    column 2: Receiving power of long-range telescope [mV] The output voltage of APD (Avalanche Photo Diode) of the long-range (far) receiving telescope, converted from receiving power to voltage in mV unit, is shown. In the case of laser link experiment, the gain multiplier of the APD is set to high (M = 100, parameter set = 8), the responsivity (conversion coefficient from receiving power to output voltage) is 500 kV/W.
    column 3: Laser energy [mJ] This column shows the energy of laser pulse from the LIDAR in mJ unit.

LIDAR related papers

The following papers would be useful to know more about Hayabusa2 LIDAR.
  1. Namiki, N. et al. in New Results in the Observations and Space Exploration of Asteroids, ed. by W-H. Ip (Macau University of Science and Technology, Macao, 2012), pp. 74-96
  2. Mizuno, T., Kase, T., Shiina, T. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-015-0231-2
  3. Yamada, R., Senshu, H., Namiki, N. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-016-0240-9
  4. Senshu, H., Oshigami, S., Kobayashi, M. et al., Space Sci. Rev. (2016). doi:10.1007/s11214-016-0242-7
  5. Noda, H., Kunimori, H., Mizuno, T. et al., Earth, Planets and Space (2017), doi:10.1186/s40623-016-0589-8