Checklist
Table 108 Receiver Bandwidth Checklist
Task Checked OK/Not OK Remarks
Test procedure completed successfully.
Parameters are set.
See 6.7 Pr — Plot Receiver Waveforms (page 155).
Test Passed
For Customer Date:
For Vaisala Date:
A.24 Checking Receiver Phase Noise
Test Goal
Verify the stability of the STALO by looking at the phase noise of a clutter target.
Background
For proper velocity calculations and for ground clutter rejection, radar's must STALO
maintain a stable frequency, and that the transmitted pulse must not contain any amplitude
or phase artifacts.
Test Equipment
Ascope utility. See IRIS and RDA Utilities Guide.
Known clutter targets with no weather signal
Test Procedure
1.
Configure the radar for normal operation expect pointing at a known clutter target.
2. Run the Ascope utility and configure as follows:
• 16-bit time series
• Spectrum not from DSP
• Spectrum size 256
• Rectangular window
• Short pulse width
• High PRF
• No clutter
filters
3. Select the maximum range and number of bins to get the maximum resolution over the
target. For targets < 24 km, use 201 bins, 25 km.
4. Select the range bin of the target.
5. Try minor changes in Az, El, and Range to get the lowest phase noise. The goal is less
than 1° within 20 km.
Appendix A – Installation and Test Procedures
365
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