User's Manual

UM-003-A OPS243-A User Manual 9 OmniPreSense Corporation
Sampling Rate/Buffer Size (-A, -C Doppler only) – set these values to control the sample rate of the
module. This setting influences the output data and the rate at which the data is reported. The buffer
size influences the report rate and resolution. A buffer size of 512 will have a report rate between 5-30Hz.
The resolution becomes worse by a factor of two with a 512-buffer size versus 1024 (Figure 6) and worse
again at 256 buffer size.
Command
Name
R/W
Notes
SI
1K samples/second
Write
SV
5K samples/second
Write
SX or S1
10K samples/second
Write
S2
20K samples/second
Write
SL
50K samples/second
Write
SC
100K samples/second
Write
S>
1024 buffer size
Write
1024 samples are collected before processing
S<
512 buffer size
Write
512 samples are collected before processing
S{
256 buffer size
Write
256 samples are collected before processing
Figure 6. Doppler (-A) Buffer Size versus Resolution
-0.10
0.10
0.30
0.50
0.70
0.90
1.10
1.30
1.50
1.70
1.90
2.10
2.30
2.50
1,000 10,000 100,000
Resolution (m/s)
Sampling Rate
256 Buffer
512 Buffer
1024 Buffer