Multiple Time Around / MTA is the situation that might occur while scanning when several laser pulses are emitted before the echo from the previous laser pulse reaches the laser scanner. It means that multiple pulses are ‘in the air’ simultaneously. It depends on range to a target and laser pulse repetition rate. Ranging becomes ambiguous, i.e. assignment of the echoes to their corresponding laser pulses is not possible without additional information. This is often referred to as multiple time around (MTA) problem.
