Photography of large meteoroids penetrating deeply into the Earth's atmosphere. Addition to traditional multi-station photography with periodic shutters for calculating the atmospheric trajectory and velocity of the meteoroid: add 1 Hz time markers to the waveform driving an LCD shutters. This creates additional reference points for comparing records from multiple stations. This technique was pioneered by the Ondřejov Observatory in the Czech Republic [reference needed].
The required meteor obstruction pattern is visible from the photograph below (courtesy of the Astronomical Institute of the Academy of Sciences of the Czech Republic).
When using an LCD shutter to realize the required pattern one needs an LCD opaqueness waveform represented in the figure below.
Based on TIMEPULSE and TIMEPULSE2 signals from a Ublox Neo-M8T SoC.
Based on an Arduino board.