Vaisala Vaisala GPS GPS

stationstation

Egyptian Meteorological Authority (EMA) Koubry ELQuobba EMA , Cairo , Egypt , P.

BOX : 11784

Fax : 00202 226852789 zanb_f@hotmail.com

AbstractAbstract

Egyptian Meteorological Authority ( EMA ) will begin a new development technology for Upper air ground Egyptian Meteorological Authority ( EMA ) will begin a new development technology for Upper air ground

stations at jun 2010 by adding new sounding system SR2K2 MODEM with radio sond M2K2-DC from France stations at jun 2010 by adding new sounding system SR2K2 MODEM with radio sond M2K2-DC from France and new technology for communication of network of the stations .and new technology for communication of network of the stations .

also EMA have 6 upper air stations which used the sounding system of Digicora iii with Radiotidotite RT also EMA have 6 upper air stations which used the sounding system of Digicora iii with Radiotidotite RT 20A ( Vaisala ) from fenland . 20A ( Vaisala ) from fenland .

So since 2007 we started to use new development technology with the GPS wind finding system (Vaisala) , for So since 2007 we started to use new development technology with the GPS wind finding system (Vaisala) , for three upper air stations in (Matrouh at 2007 , Asswan at 2008 and Helwann at 2009 ) to using Digicoraiii three upper air stations in (Matrouh at 2007 , Asswan at 2008 and Helwann at 2009 ) to using Digicoraiii with Radiotidotite RT 20A and GPS wind finding system. with Radiotidotite RT 20A and GPS wind finding system.

In this paper We will compare between the different of observations from RDF and GPS system.In this paper We will compare between the different of observations from RDF and GPS system.Also , we will use DigicoraIII dual-mode GPS/RDF Also , we will use DigicoraIII dual-mode GPS/RDF wind finding awind finding and Modem GPS data Comparison flights executed in nd Modem GPS data Comparison flights executed in

Asswan , Marsa Matrouh and Helwan stations , during 2007 to 2010 by the EMAAsswan , Marsa Matrouh and Helwan stations , during 2007 to 2010 by the EMA. .

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Global Global Positioning Positioning System (GPS)System (GPS)GPS GPS

Signal Signal PathPath

There are two system in upper air stations 1-Upper Air sounding system SR2K2 Modemconsists in collecting P,T,U, and wind finding data measured and transmitted from a

Radiosonde M2K2-DC during its flight through upper atmosphere layers which used M2K2-DC (Dual Core) GPSonde that is already widespread in the operational SYNOP upper-air network of major and National Met. Services.

M2K2 GPSonde successfully participated to the latest WMO inter-comparison of High-Quality Radiosondes, Designation of High-Quality Radiosonde is fully applicable to MODEM’s M2K2 GPSonde

2-The DigiCORA® Sounding System MW312-The DigiCORA® Sounding System MW31 with the Radiotheodolite RT20A and GPS wind finding ( Vaisala )( Vaisala ) contains :- contains :-

A-Radiotheodolite RT20 system Radiotheodolite windfinding is best suited for situations where the balloon elevations

remain above about 16°, so we using the stations of Radiotheodolites in the summer season .

B-GPS wind finding system portable system with small antennas for 403 MHz telemetry and GPS wind finding RS92-portable system with small antennas for 403 MHz telemetry and GPS wind finding RS92-

SGP Radiosonde for GPS wind Technology, Major Features SGP Radiosonde for GPS wind Technology, Major Features All-digital All-digital code-correlating code-correlating GPS GPS Radiosonde Higher level of PTU measurement performance Continuously Radiosonde Higher level of PTU measurement performance Continuously available, highly accurate wind data code correlating GPS . available, highly accurate wind data code correlating GPS .

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We compare between the two upper air systems vaisala and Modem-:

In the fig (1), (2) and (3) we used system of Modem of upper air sounding system in the 14 jun 2010 we used Modem system and in the fig (4),(5) and (6) the day of 14 jul 2010 we used Vaisala system this data for Marsa matroh , Asswan, and Helwan stations.

In the fig (7) it the statistics for data of max height of wind speed from( Dec 2007 to Feb 2008 ) with using vaisala upper air sounding system we found the data of wind speed and direction for all observations reach to about

(30-20) kms.

Max height of wind for Matroh station from (dec2007 to feb2008) GPS

0

5000

10000

15000

20000

25000

30000

35000

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

no of observations

max

hei

ght b

y m

Dec2007 Jan2008 Feb2008

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Asswan station in Egypt it is one of The Upper-air Network (Asswan station in Egypt it is one of The Upper-air Network (GUANGUAN) which consists of stations selected from the ) which consists of stations selected from the Global Observing System of the World Weather Watch. Criteria for choice of sites included homogeneity, a history of Global Observing System of the World Weather Watch. Criteria for choice of sites included homogeneity, a history of high quality observations . high quality observations .

The data flow for the GUAN begins with national centers that collect and submit the data to the international The data flow for the GUAN begins with national centers that collect and submit the data to the international system. system.

The data collected by the network of GUAN stations are transmitted on the GTS in the form of upper-air reports (TEMP and CLIMAT TEMP).

International centers perform quality control on the data, prepare data products for users, and archive it for future International centers perform quality control on the data, prepare data products for users, and archive it for future users. Some of these international centers prepare routine reports on the performance of the system. users. Some of these international centers prepare routine reports on the performance of the system.

Summary Of GUAN for Asswan Station Summary Of GUAN for Asswan Station

Range time Range time WMO STATION OBS LVLS 00Z 12Z AVGPRS >100 >50 >10 TEMPS DPDS WINDS WMO STATION OBS LVLS 00Z 12Z AVGPRS >100 >50 >10 TEMPS DPDS WINDS

(2007 /8 ) 62414 ASSWAN, EGYPT 30 1780 30 0 52.9 27 27 0 1075 630 1157 ( Air upper air st.) (2007 /8 ) 62414 ASSWAN, EGYPT 30 1780 30 0 52.9 27 27 0 1075 630 1157 ( Air upper air st.)

(2008 /8) 62414 ASSWAN, EGYPT 28 2097 28 0 26.2 27 26 0 1129 693 1410 ( vaisala upper air st.)(2008 /8) 62414 ASSWAN, EGYPT 28 2097 28 0 26.2 27 26 0 1129 693 1410 ( vaisala upper air st.) (2009 /9) 62414 ASSWAN, EGYPT 29 2541 29 0 16.8 28 28 4 1225 770 1817 ( vaisala upper air st.)(2009 /9) 62414 ASSWAN, EGYPT 29 2541 29 0 16.8 28 28 4 1225 770 1817 ( vaisala upper air st.)

(2009/11-4)(2009/11-4) 62414 ASSWAN, EGYPT 179 16893 179 0 23.3 171 166 4 8215 5071 11446 ( vaisala RDF&GPS upper ( vaisala RDF&GPS upper air)air)

(2010 /4) 62414 ASSWAN, EGYPT 30 2914 30 0 22.6 30 27 1 1344 820 2064 ( vaisala RDF upper air (2010 /4) 62414 ASSWAN, EGYPT 30 2914 30 0 22.6 30 27 1 1344 820 2064 ( vaisala RDF upper air st.)st.)

We found that seine using Air sounding system we used 500 kg of Metrological balloon which burst at latitude less than 30 km We found that seine using Air sounding system we used 500 kg of Metrological balloon which burst at latitude less than 30 km and and

fill with Hydrogen gas by using Sagim system so we found that the number of significant levels for temperature , dew point and fill with Hydrogen gas by using Sagim system so we found that the number of significant levels for temperature , dew point and wind inwind in

Air system is less than when used Vaisala system for GPs and RDF system .Air system is less than when used Vaisala system for GPs and RDF system .