Sometimes it is useful to run plot commands with samples from the IF-Input of the IFDR,
rather than from the Burst-Input.
Press % to toggle between the IF input SMA connectors on the IFDR.
1. Use Mb to set the systems intermediate frequency.
See 5.2.1 Mb — Burst Pulse and AFC (page 93).
2. Use Mt to choose the PRF and pulse width. Also, choose the range resolution, as it may
constrain the design of the matched
filter later.
See 5.2.5 Mt — General Trigger Setups (page 113).
3. Use Mt0, Mt1, and so on to set the relative timing of the RVP900 triggers used by the
radar.
Do not worry about the absolute values of the trigger start times. Set their polarity and
width, and their start times relative to each other.
Make an initial guess of FIR
filter length as 1.5 times the pulse width.
See 5.2.6 Mt<n> — Triggers for Pulsewidth n (page 116).
4. Use Pb to slew the start times of all triggers so that the burst pulse is properly sampled.
Refine the impulse response length if necessary so that all samples easily fit within the
display window.
See 6.5 Pb — Plot Burst Pulse Timing (page 132).
5. Use Ps to design the matched FIR
filter.
See 6.6 Ps — Plot Burst Spectra and AFC (page 137).
a. Further refine the impulse response length and passband width to achieve a filter
that matches the spectral width of the burst, and that has strong attenuation at DC.
If the FIR length has changed, return to Pb to verify that the burst is still sampled
properly
6. Continue using Ps and Mb to tune the AFC feedback loop.
The settings that work for one pulse width should also work for the others.
7. Use Pr to verify that targets are being detected with good sensitivity.
See 6.7 Pr — Plot Receiver Waveforms (page 155).
8. Repeat the procedure for each pulse width supported by the radar.
6.4
P+ — Plot Test Pattern
You can use the P+ command to generate a simple test pattern and verify that the display
software works properly.
Chapter 6 – Plot-assisted Setups
131
To Next Page
Loading...