Transcript The RVP8TM Digital Tx/Rx and Signal Processor for Weather

The RVP8TM Digital Tx/Rx
and Signal Processor
for Weather Radar
Elena Saltikoff
SIGMET
The Famous RVP7
• Most widely sold Doppler weather radar
processor (over 200 units)
• All the algorithms of RVP7 are ported to the
new RVP8 Architecture.
• RVP8: new capabilities, new hardware
solutions and a digital transmitter.
Digital Transmitter and Receiver
(digitally synthesized IF waveform)
More control of the signal
• Real time signal correction for I/O samples:
- Amplitude correction
- Phase stability of magnetrons to nearly as
good as klystrons (better clutter cancellation)
• Linear dynamic range 98 dB for a 1 s pulse
• Linearization
(saturation 3-5 dB later due to oversampling)
For Klystron Radars also
• Pulse Compression
(less power, less interference)
• Frequency agility
(dual frequency, more range resolution)
• Phase agility
(2nd trip cancellation)
Long Expected Life Cycle
Easy to maintain, upgrade and expand
• Open hardware: standard PCI bus technology
• Linux, Pentium, Standard I/O
• SoftPlaneTM to control critical I/O
• API (Application Program Interface)
for own innovations
Nexrad gets RVP8, too
• Prototype RVP8 July 2002
• 10 sites during 2003
• 150 sites more
2004 – 2005
• RVP8, RCP8 and
IRIS/Radar
Examples of newish algorithms
• Adaptive FFT Doppler filter
• Random Phase “Doppler Doubler”
(for Doppler dilemma)
• SQI threshold for V and Z
• 2D speckle filter (remove and fill)
Adaptive FFT
Doppler filter:
Cancellation limits
move dynamically
within set limits
Random Phase “Doppler Doubler”
• Study the phase of two pulses
(for magnetron random, for klystron controlled)
• Use SQI threshold for each
• Recover the 2nd trip echo
• Allows use of higher PRF
2D Speckle filter
• Study 8 neighbors in range and azimuth
• Delete or fill
?
Want to know more ?
• 23-page technical description available
• 3-page paper at ERAD (O’Hora et al.)
www.sigmet.com
I’ll add some slides
for those who want
technical details.
That’s Hannu,
really, cheers !
RVP8 Example: Basic Magnetron System
Digital STALO
DAFC
triggers
Received IF
Magnetron IF
IFD
fiber downlink
antenna angles
RVP8/RX
RVP8/IO
SBC
10 /100 BASE-T LAN
K/V/M
PCI BUS
Linearity