USER’S MANUAL__________________________________________________________________
260 _________________________________________________________________ M211322EN-D
3072, though depending on the computational intensity of the
configuration, the RVP900 may be able to compute fewer bins. If the
number of bins selected in the bit mask exceeds this maximum, the trailing
bins are truncated. If the new mask does not specify any active bins, then
a single bin at range zero is forced on. The default power-up mask selects
256 bins equally spaced by 1.0km starting from zero range.
Range averaging is also determined by LRMSK. The upper byte of the
command controls how many consecutive bins are grouped together. A
value of zero means no averaging; one means that pairs of samples are
averaged; 255 means that 256 terms are summed, etc. The individual
samples that go into each average are still taken according to the bits that
are set in the mask, except that they are now grouped together so that only
one net bin results from the several data samples. Note that the limitation
of 3072 sampled ranges applies to the bin count prior to averaging.
For example, suppose 100 bits are selected in the range mask and no
averaging is elected. Then parameters are computed at those 100 ranges,
and 100 bins of data are output. If the averaging were set to one, rather than
zero, samples would still be taken at the same ranges, but pairs of bins
would be averaged together and only 50 ranges would result. Note that the
parameters are averaged by summing the autocorrelations for each bin.
The range normalization value associated with the averaged bin is
computed according to the midpoint of the first and last sample.
Incompletely averaged bins are discarded by the LRMSK command. In the
above example, if the averaging were set to two so that triples of samples
were summed, then only 33 bins would be output. This is because the 100-
bit mask left a dangling 100th sample. In the extreme case where there are
not enough mask bits to result in even one complete bin, the RVP900
forces the averaging to zero and turns on a single bin at zero range.
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