Use the following parameter to select the channel used for RX and burst pulse sampling:
• Type NO to use the default Burst Sample Input of ADC-E.
• Type YES to sample the burst pulse on the channel configured as the IF signal input.
See 4.2.6 RVP901 IFDR Inputs (page 62).
In this configuration, the IF signal and the burst pulse signal are received on the same
ADC channel.
Use the same channel for Rx and Burst Pulse Sampling: NO
The PhaseLock parameter controls if RVP900 locks the phase of its synthesized I and Q
data to the measured phase of the burst pulse.
• Type YES for an operational magnetron system, since the transmitter's random phase
must be known to recover Doppler data.
• Type NO for non-phase modulated klystron systems in which the IFDR sampling clock is
locked to the COHO.
NO is also useful for bench testing. In these cases, the phase of I and Q is determined
relative to the stable internal sampling clock in the IFDR module.
PhaseLock to the burst pulse: YES
The Minimum power for valid burst pulse parameter is the minimum mean
power required in the burst pulse for it to be considered valid and suitable for input into the
algorithms for frequency estimation and AFC. For information on the reporting burst pulse
power, see 6.5 Pb — Plot Burst Pulse Timing (page 132).
The mean power level of the burst is computed within the narrowed set of samples used for
AFC frequency estimation. The narrow pane contains only the active portion of the burst,
and thus a mean power measurement is meaningful. The full FIR pane includes the leading
and trailing pulse edges and would not produce a meaningful average power. Since radar
peak power tends to be independent of pulse width, this single threshold value can be
applied for all pulse widths.
The value entered here should be, perhaps, 8 dB less. This makes sure that burst pulses are
properly detected even if the transmitter power fades slightly.
Limits: -60 ... +10 dBm
Minimum power for valid burst pulse: -15.0
Choose the analysis window used in the design of the FIR matched
filter and the
presentation of the power spectra for the scope plots.
RVP900 User Guide M211322EN-J
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