Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.ipa.nw.ru/conference/wpltn2012/docs/25/1120%20ilyin.pdf Дата изменения: Mon Oct 1 12:17:42 2012 Дата индексирования: Sun Feb 3 17:26:42 2013 Кодировка: Поисковые слова: столовая гора

Institute of Applied Astronomy

Ilin G., Mitryaev V.

Transparency of the atmosphere according to WVR data in Svetloe observatory and quality of LRS "Sazhen-TM" observations

WPLTN -2012 ,St. Petersburg , September 24 -27


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Prototype of WVR is mounted in Svetloe observatory in 2011
W V R + V LB I

Elgered, G. (1993). Atmospheric Remote Sensing by Microwave Radiometry, Ed. M. A. Janssen, John Wiley & Sons, Inc., pp. 215-258.


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Operation mode:
Total power measurements of the LNA input signal

Hach, J.P. A very Sensitive Airborne Microwave Radiometer Using Two Reference Temperatures. IEEE Trans. On MTT, 1968, 16, 629-636.

WVR Micro wave block (


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Parameters Frequency bandwidth, - 3 dB, GHz Block Block B Noise temperature, at the input , , Block Block B Gain, up to Sq. law detector, dB Block Block B Real sensitivity, m, t = 1s (dry weather) Block Block B Relative gain instability 1h/24 h, , less than Value able 1. 20,75±0,25 WVR MW Block Parameters 32,05±0,25 .

132 288 65 65

5 0 /1 2 6 0 /1 8
amb

= ±0.5°, % , 0,03 0,06 6 5

HPBW, degree Angular resolution Az, El, arc minutes


Institute of Applied Astronomy WVR - new instrument for Quasar observatory WVR ­ highly sensitive to Ta (t) variations, WVR channel 21GHz ­ more sensitive for water vapor WVR channel 32GHz ­ more sensitive for condensed water

Can WVR register small troposphere turbulence (small variation in Ta) ?


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Date 2012-05-02 2012-05-03
2012-05-04 2012-05-06

Time Time Satellite 0:00 9:40
1 :2 0 1 :5 3 2 :0 7 2012-05-09 1 :1 3 2 3 :3 9 2012-05-10 2012-05-14 0 :0 1 1 :2 7 9 :5 3 2012-05-15 2012-05-18 2012-05-19 0 :0 2 0 :2 1 2 2 :2 4 1 :5 2 3 :3 3 7 :3 5 1 7 :0 3 2012-05-20 2012-05-21 2012-05-23 2012-05-25 2012-05-26 0 :1 6 2 3 :0 2 3 :4 5 7 :4 3 1 8 :3 8 8 :0 1 2 1 :4 2

Dist., km 5850 5625

Quantity, N(LRS) T, minutes 3459 194
191 361 236 136 428 5136 347 444 651 596 33 546 100 301 2325 1280 593 566 213 2590 855 2532

0:24 1 9:49 2
1:22 1 1:59 1 2:11 1 1:19 1 23:56 1 0:19 1 1:37 1 9:55 1 0:06 1 0:24 1 22:37 1 2:00 1 4:02 2 7:41 2 17:14 1 0:44 1 23:17 1 4:09 2 7:48 2 18:51 1 8:11 2 22:02 1

24 9
2 6 4 6 17 18 10 2 4 3 13 8 9 6 11 28 15 24 5 13 10 20

Tme

an

10m

2012-05-27 1:33 1:44 1

278

11


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2012:05:10


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T(B) ­ antenna temperature in Kelvin in channel B of WVR (32GHz), z e n i th a n g l e z = 0 T(B) mean ~16,5 K

T(A) mean ~15,2 K


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1 D (t ) = D (k ) = N -k
2

N -k i =1

( x (i )

- x (i + k

))2

2012:05:19, N=546, Scl~40


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D()

0,003

0,0025

0,002

0,0015

0,001

0,0005

0 0 20 40 60 80 100 120 140 160

n*5.7, s

2012:05:18, N=33, Scl ~ 10


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Thank you


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