Furuno WR2120 Operator's Manual page 27

Recommend values for pulse setting:
In radar operations it is necessary to select the optimum setting for the location while considering all
trade-offs.
For example; there is no way to observe rain with high accuracy using a fast antenna rotation speed or having
wide detection range, high PRF, high sensitivity, and high resolution.
The length of the detection range and the value of PRF are a trade-off relationship. High sensitivity and
high resolution are also generally another trade-off relationship. It is also difficult to achieve both high
antenna rotation speed and precise precipitation observation.
The general trade-offs of radar, operational precautions, etc. are described in the World Meteorological
Organization's "WMO GUIDE TO METEROROLOGICAL INSTRUMENTS AND METHODS OF
OBSERVATION (the CIMO Guide, WMO-No. 8) PART 2 OBSERVING SYSTEMS CHAPTER 7 Radar
measurements" Since it is written in detail, please refer to when configuring the radar.
For some observational tradeoffs, please select the optimal setting which best fits the radar installed
location using Table 2.7 or Table 2.8 below.
Non-
Pulse RX modulation
pulse width
No.
[km] [μs]
1-1 30 0.5
1-2 30 1
1-3 50 1
1-4 70 1
1-5 50 2
1-6 30 2
1-7 50 2
1-8 70 2
2-1 30 0.5
2-2 30 1
2-3 50 1
2-4 70 1
2-5 50 2
2-6 30 2
2-7 50 2
2-8 70 2
3-1 30 0.5
3-2 30 1
3-3 50 1
3-4 70 1
3-5 50 2
3-6 30 2
3-7 50 2
3-8 70 2
Note:
1. Pulse No.3-2 means PRF pattern = 3 and Pulse set = 2 in RainMap TX setting.
2. The values of PRF are slightly different between No.1-1, No.2-1, and No.3-1. The same applies to No.
1-2, No.2-2, No.3-2, and subsequent values.
3. Method of using No.1-1, No.2-1, and No.3-1 properly: For example if changed from No.1-1 to No.2-1 or
No.3-1, when No.1-1 scans it may have interference waves from other transmissions. However there
are cases when this interference influence can be reduced.
4. Mix*: Short pulse is 150, and long pulse is 75. It does not affect to scn file.
5. Non-modulation pulse width is P0N, Modulation pulse width is Q0N.
Table 2.7: Pulse setting
Short
Modulation
pulse
pulse width
range
[km] [μs] [MHz]
3.3 20 4
4.8 30 2
6.3 40 2
7.8 50 2
7.8 50 2
4.8 30 1
6.3 40 1
7.8 50 1
3.3 20 4
4.8 30 2
6.3 40 2
7.8 50 2
7.8 50 2
4.8 30 1
6.3 40 1
7.8 50 1
3.3 20 4
4.8 30 2
6.3 40 2
7.8 50 2
7.8 50 2
4.8 30 1
6.3 40 1
7.8 50 1
S2E-17-0208_OM_WR2120_C
PRF1 PRF2 Resolution
[Hz] [Hz]
2000 1600
2000 1600 150
1700 1360 150
1300 1040 150
1600 1280 75/150 Mix*
2000 1600 300
1700 1360 300
1300 1040 300
1900 1520
1850 1480 150
1575 1260 150
1200 960 150
1450 1160 75/150 Mix*
1850 1480 300
1575 1260 300
1200 960 300
1825 1460
1750 1400 150
1475 1180 150
1125 900 150
1350 1080 75/150 Mix*
1750 1400 300
1475 1180 300
1125 900 300
18
related
Sensitivity
[m]
Low
75
Mid
Low
Low
Mid
High
Mid
Mid
Low
75
Mid
Low
Low
Mid
High
Mid
Mid
Low
75
Mid
Low
Low
Mid
High
Mid
Mid
PRF
High
High
Mid
Low
Mid
High
Mid
Low
High
High
Mid
Low
Mid
High
Mid
Low
High
High
Mid
Low
Mid
High
Mid
Low