USER’S MANUAL__________________________________________________________________
290 _________________________________________________________________ M211322EN-D
occur. In such cases, the correct number of words are still output, but they
are all zero after the point at which overflow was detected.
7.8 Load Clutter Filter Flags (LFILT)
A special feature of the RVP9 processor is that any of the available clutter
filters may be chosen independently at each selected range. This range-
dependent clutter removal is useful when the clutter characteristics vary
with increasing range. Typically, clutter interference is most severe in the
immediate vicinity of the radar. Thus, a highly rejective filter might be
chosen for near ranges, and a less rejective or perhaps no filter could be
used at far ranges.
Legacy Version
In the legacy version of LFILT, the input words following the command
specify the choice of filter to be applied at each of the selected range bins.
A fixed size filter table is always loaded, regardless of whether the range
mask (see Section 7.2 Load Range Mask (LRMSK) on page 257) is using
the full number of bins. In such cases, the later filter codes are simply
ignored for the current range mask. However, if a longer range mask is
loaded in the future, then those later codes would apply to the
correspondingly numbered bins. Put another way, each filter code is
associated with a particular bin number, not with a particular range. The
correspondence between bin numbers and actual ranges is made only
through the range mask.
Only the low three bits are used in each word to specify the filter number.
If the L3K bit is set in the Command, then 3072 words are loaded,
otherwise only 512 words are loaded. In both cases the last filter choice is
replicated for all bins further in range.
0916-116
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| |ALL| 0 1 0 0 0 | Command
|_______________________________________|___|___________________| (Legacy)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
| | | | | | | | | | | | | | | | |
| | Filter #1 | Input 1
|___________________________________________________|___________|
.
.
Either 512 or 3072 Words Loaded
To Next Page
Loading...
Need help?
General