Vaisala RVP900, User Manual, Page: 31 / 484

Figure 6 Received Signal Spectrum Analysis Tool
3.1.4 Digital Transmitter Function
RVP900 can function as a digital radar receiver and transmitter simultaneously. RVP901
IFDR synthesizes an output waveform that is centered or offset from the radar’s
intermediate frequency. This signal is filtered using analog components, then up-converted
to RF, and finally amplified for transmission.
The transmitter can be a solid state or vacuum tube device. RVP900 can correct for
waveform distortion by adaptively “pre-distorting” the transmit waveform, based on the
measured transmit burst sample.
The IFDR has 2 SMA outputs for the IF Tx waveform. The digital IF waveforms are generated
by a 16-bit DAC with 65 dB SNR from 10 MHz ... 95 MHz. There is also a third 12-bit A/D video
channel for output for an auxiliary signal or clock up to 1.2 MHz.
The RVP900 digital transmitter complements the digital receiver in the radar system. The
receiver samples an IF waveform that has been down-converted from RF. The transmitter
synthesizes an IF waveform for up-conversion to RF. This gives RVP900 control over both
halves of the radar, making matched Tx/Rx processing algorithms possible.
Chapter 3 – Functional Description
29