Next: line number
The actual pulse repetition frequency (PRF) is computed based on the
data in the SLC leader file. However, the 'actual' value, as read
from the leader file, is used (after private communications with ESA
helpdesk). It is defined as:
PRF is the pulse repetition frequency in Hz.
Nl is the total number of lines (lastline - firstline).
is the azimuth time of the last line minus the azimuth time
of the first line,
or the acquisition time of the image.
This equation, and the following, can be easily verified by
substitution of the values for the first/last line/pixel.