Campbell-scientific Wireless Sensor Network (CWB100, CWS220, and CWS90 Instrukcja Użytkownika Strona 62
- Strona / 70
- Spis treści
- ROZWIĄZYWANIE PROBLEMÓW
- BOOKMARKI
Oceniono. / 5. Na podstawie oceny klientów
Appendix B. Measurement Names and Meanings
Standard deviation of wind direction, σ(Θu), using Campbell Scientific
algorithm:
σ(Θu)=81(1-
U
/S)
1/2
The algorithm for σ(θu) is developed by noting (Figure B.3-3) that
Cos U / s ; where
ii
(') '
Θ
Θ
Θ
Θ
ii
u
i
=
=
−
FIGURE B.3-3. Standard Deviation of Direction
The Taylor Series for the Cosine function, truncated after 2 terms is:
Cos ( ') ( ') /
ΘΘ
ii
≅−
1
2
2
For deviations less than 40 degrees, the error in this approximation is less than
1%. At deviations of 60 degrees, the error is 10%.
The speed sample may be expressed as the deviation about the mean speed,
ss'S
ii
=
+
Equating the two expressions for Cos (θ‘) and using the previous equation for
s
i
;
12
2
−=
(')/ /(')
Θ
iii
UsS
+
Solving for
(')
Θ
i
2
, one obtains;
(') / (')'/ '/
ΘΘ
iiii
U S sS sS
22
22 2
=− − +
i
Summing
(')
Θ
i
2
over N samples and dividing by N yields the variance of Θu.
Note that the sum of the last term equals 0.
(( )) (')/ ( /) ((')')/
σ
ΘΘ Θ
uNUSs
ii
i
N
i
N
22 2
11
21
==−−
==
∑∑
NS
i
B-6
- Wireless Sensor Network 1
- Warranty 3
- Assistance 4
- Table of Contents 5
- Figures 7
- 2. Specifications 16
- 2.1.2 Typical RF Range 17
- 2.1.3 RSSI 17
- 2.2 CWB100 Specifications 18
- 2.3 CWS220 Specifications 19
- 2.4 CWS655 Specifications 20
- 2.5 CWS900 Specifications 21
- Network 22
- 3.1.2 Required Cables 23
- 3.1.3 Configuration CD 24
- 3.1.5 Driver Installation 24
- 3.9 Physical Connections 36
- 4.1 Array Declaration 37
- 4.2 CWB100() Instruction 38
- 4.2.1 Configuration String 39
- 4.2.2 Field Names 40
- 4.2.3 Status Monitoring 40
- 4.6 Program Example 43
- 5.2 Sensor Battery Voltage 45
- 6. Testing the Network 46
- 7. Maintenance 48
- 8. Troubleshooting 50
- Meanings 57
- B.3 CWS900 Default Names 58
- Measured raw data: 60
- Calculations: 60
- ()(( /)) ( /) 63
- Appendix C. Battery Life 65
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