Specifications

Introduction and Specifications
RVP8 User’s Manual
March 2006
1–24
S Computation of “I” and “Q” quadrature values (also performed during the band pass
filtering step).
S Transmit burst sample frequency, phase and amplitude calculation
S I and Q phase and amplitude correction based on transmit burst sample.
S Interference rejection algorithm.
S AFC frequency error calculation with output to IFD for digital or analog 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 (e.g., processor major mode, PRF, pulsewidth, gate
spacing, etc.) is supplied from the host computer.
The digital matched filter that computes “I”
and “Q” is designed in an interactive man-
ner using a TTY and oscilloscope for graph-
ical display. The filter’s passband width
and impulse response length are chosen by
the user, and the RVP8 constructs the filter
coefficients using built-in design software.
The frequency response of the filter can be
displayed and compared to the frequency
content of the actual transmitted pulse.
Microwave energy can come from a variety of transmitters such as ground-based, ship-based or
airborne radars as well as communications links. These can cause substantial interference to a
weather radar system. Interference rejection is provided as standard in the RVP8. Three different
interference rejection algorithms are supported.
The RVP8/Rx board places the wide dynamic range “I” and “Q” samples directly on the PCI
bus where they are sent to the processor section of the PC (e.g., dual Pentium processors on a
single-board computer or motherboard). The I/Q values are then processed on the Pentium
processors to extract the moment information (Z, V, W and optional polarization parameters).
The I and Q values can also be placed on a gigabit Ethernet line (1000 BaseT) which is provided
directly on the processor board. This means that there is no second PCI bus “hit” required to
send the data to a recording system or a completely separate processing system.