Loran Envelope match
Envelope match (in Loran)
The comparison, in time difference, between the leading edges of the demodulated and filtered pulses from a master and a slave station.
The pulses are superimposed and matched manually or automatically.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM