Vaisala RVP900 User Manual

USER’S MANUAL__________________________________________________________________
50 __________________________________________________________________ M211322EN-D
2.10 RVP900 Control and Maintenance Features
2.10.1 Radar Control Functions
The RVP900 also performs several important radar control functions:
- Trigger generation—Up to eight programmable triggers
- Pulse width control (four states controlled by four bits)
- Angle/data synchronization—To collect data at precise azimuth
intervals (for example, every 0.5 degree, 1 degree, 1.5 degrees) based
on the AZ/EL angle inputs
- Phase shifter—To control the phase on legacy Klystron systems. New
or upgraded Klystron or TWT systems can use the RVP900/Tx card
to provide very accurate phase shifting
-Z
dr
switch control—For horizontal/vertical or other polarization
switching scheme
- AFC output (digital) based on the burst pulse analysis for magnetron
systems
Pulse width and trigger control are both built into the RVP900. Four TTL
output lines can be programmed to drive external relays that control the
transmitter pulse width. The internal trigger generator drives eight separate
lines, each of which can be programmed to produce a desired waveform.
The trigger generator is unique in that the waveforms are stored in RAM,
and can be modified interactively by user software. Precisely delayed and
jitter-free strobes and gates can be easily produced. For each pulse width,
there is a corresponding maximum trigger rate that can be generated;
however, the RVP900 can also operate from an external user-supplied
trigger. In either case, the processor measures the trigger period between
pulses, so that user software can monitor it as needed.
The RVP900 also supports trigger blanking, during which one or more
(selectable) of the transmit triggers can be inhibited. Trigger blanking is
used to avoid interference with other electronic equipment and to protect
nearby personnel from radiation hazard. There are two techniques:
- 2D AZ/EL sector blanking areas can be defined in the RVP900
- An external trigger blanking signal (switch closure to ground, TTL, or
RS422) can be supplied, for example, from a proximity switch that
triggers when the antenna goes below a safe elevation angle or
connected to the radome access hatch

Vaisala RVP900 Specifications

General

Brand	Vaisala
Model	RVP900
Category	Receiver
Language	English