NEXRAD Range and Velocity Ambiguity Mitigation

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Mitigation of Range/Velocity Ambiguities

Proposed VCP 11

The following table describes the selected PRTs and other parameters that we propose for the VCP 11 of the WSR-88D.

 

Cut #

Elev.

(deg)

 AZ rate

(deg s-1)

 Period

(s)

 Dwell time

(ms)

 WF type Tu (ms) T1 (ms) T2 (ms) M rar (km) rav (km) va (m s-1)
1 0.48 18.90 19.05 52.81 CS,1 3.11 - - 17 466 - -
2 0.48 20.00 18.00 49.92 SZ(8/64) 0.78 - - 64 - 234 35.5
3 1.45 20.10 17.91 49.71 CS,1 3.11 - - 16 466 - -
4 1.45 20.00 18.00 49.92 SZ(8/64) 0.78 - - 64 - 234 35.5
5 2.42 17.20 20.92 58.27 ST(2/3) 0.61 1.22 1.84 19 276 184 45.1
6 3.34 19.00 18.95 52.57 ST(2/3) 0.55 1.11 1.66 19 249 166 50.1
7 4.31 19.80 18.18 50.6 ST(2/3) 0.46 0.92 1.38 22 207 138 60.2
8 5.23 18.70 19.25 53.40 ST(2/3) 0.59 1.19 1.78 18 267 178 46.7
9 6.20 18.60 19.35 53.90 ST(2/3) 0.51 1.03 1.54 21 231 154 54.0
10 7.51 26.70 13.48 37.4 ST(2/3) 0.44 0.88 1.32 17 198 132 63.0
11 8.70 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9
12 10.02 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9
13 12.00 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9
14 14.02 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9
15 16.70 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9
16 19.51 27.70 13.00 36.1 ST(2/3) 0.38 0.76 1.14 19 171 114 72.9

  

Abbreviations:

  • Elev.: Elevation angle (in deg)

  • AZ rate: Antenna rotation speed (in deg/s)

  • Period: Period of one cut (360 deg) (in s)

  • Dwell time: Period of one radial (in ms)

  • WF type: Waveform type. It could be:

  • CS,x: Contiguous Surveillance, PRT #x

  • SZ(n/M): SZ Phase Coded Contiguous Doppler

  • ST(r): Staggered PRT (with no overlay resolution and r as the stagger ratio)

  • PRT #: PRT number

  • Short PRT #: Short PRT number (for staggered PRT)

  • Long PRT #: Long PRT number (for staggered PRT)

  • M: Number of pulses in one radial

  • Tu: PRT period (in ms)

  • T1: Short PRT period (for staggered PRT) (in ms)

  • T2: Long PRT period (for staggered PRT) (in ms)

  • rar: Maximum unambiguous range for the reflectivity field (in km)

  • rav: Maximum unambiguous range for the velocity field (in km)

  • va: Effective maximum unambiguous velocity (obtained after de-aliasing for the staggered PRT mode) (in m/s)

The fields of reflectivity, velocity, and spectrum width are displayed for several events. Labels on the figures indicate the variable (Reflectivity, Velocity, or Spectrum Width), the waveform type (Staggered PRT, Uniform PRT, PC=Phase Coded, or Non PC), the elevation angle (EL), the date, and the approximate time. The following selected case studies are available:

Event descriptions are extracted from the JPOLE KOUN database.

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© Sebastian Torres

Last modified on 05/06/2008

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