USER’S MANUAL__________________________________________________________________
42 __________________________________________________________________ M211322EN-D
The functions performed by the processor are:
- Reception of the digital serial fiber optic data stream
- Band pass filtering of the IF signal using configurable digital FIR
filter matched to the pulse width
- Range gating and optional coherent averaging (essentially performed
during the band pass filtering step)
- Computation of "I" and "Q" quadrature values (also performed during
the band pass filtering step)
- Transmit burst sample frequency, phase, and amplitude calculation
- I and Q phase and amplitude correction based on transmit burst
sample
- Interference rejection algorithm
- AFC frequency error calculation with output to IFDR for digital
control of STALO (for magnetron systems)
The advantage of the digital approach is that the software algorithms for
these functions can be easily changed. Configuration information (for
example, processor major mode, PRF, pulse width, gate spacing, etc.) is
supplied from the host computer.
0916-010
Figure 14 Digital IF Band Pass
The digital matched filter that computes "I" and "Q" is designed in an
interactive manner using a TTY and oscilloscope for graphical display.
The filter's passband width and impulse response length are chosen by the
user, and the RVP900 constructs the filter coefficients using built-in design
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