1 / 25

National Spectrum Managers Association Spectrum Management 2005 May 24, 2005 Robert Ferguson - MCI

Use Of Weather Data In The Investigation Of Ku-Band Fading Events. National Spectrum Managers Association Spectrum Management 2005 May 24, 2005 Robert Ferguson - MCI. Overview. The Problem Satellite System Description

justin-rojas
Download Presentation

National Spectrum Managers Association Spectrum Management 2005 May 24, 2005 Robert Ferguson - MCI

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Use Of Weather Data In The Investigation Of Ku-Band Fading Events National Spectrum Managers Association Spectrum Management 2005 May 24, 2005 Robert Ferguson - MCI

  2. Overview • The Problem • Satellite System Description • Data Collection Methodology • Satellite • Weather (Rain) • Three Examples – Fade Events Versus Rain Data • Final Comments

  3. The Problem • VSAT Network 2-Way Performance -- Affected By Multiple Factors • Hub Site – Satellite – Terminal • Propagation Conditions (Hub – Satellite, Satellite – Terminal) • Transmission Equipment (14 GHz / 12 GHz) (Receive, Transmit, Antenna) • Interference(Radar Detectors, Sun, Adjacent Satellite, …) • Normal Contention For Shared Network Resources (Service Class Specifies Over-Subscription) • Maintenance, Etc. • Simplified Problem: During Selected Periods Of “Apparent” Degradation,Does Rain On The Downlink Path Appear To Be A Factor?

  4. Nera Satlink 1900 IDU Satellite Radio Link Summary Nera DVB-RCS Two-Way Satellite System Location : Richardson TX, USA Band : Ku (12 GHz /14 GHz) Terminal : Nera Satlink 1900 IP Router Antenna : 1.2 Meter Andrew LNB/BUC : Invacom (2W Tx Power) Hub Site : Hispasat - Near Madrid, Spain Satellite : Hispasat-1 at 30W Longitude Antenna Alignment Azimuth : 103.2 Deg Elevation : 10.8 Deg

  5. Overview • C-Language Program Serves As Hyper-Terminal Emulator • Emulator Sends Periodic CLI-Management Commands To IDU Via RS232 And Generates “Pings” To Hub-Site Server (Spain) Via LAN • Basic Downlink Data (S/N, BER, etc) And “Ping” Times Are Retrieved • Data Is Analyzed, Reformatted, And Saved Periodically (1 Minute Or Less) Example Results Of “Ping” Command Example Output From CLI-Command Pinging 192.168.3.169 with 32 bytes of data: Reply from 192.168.3.169: bytes=32 time=551ms TTL=126 Reply from 192.168.3.169: bytes=32 time=638ms TTL=126 Ping statistics for 192.168.3.169: Packets: Sent = 2, Received = 2, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 551ms, Maximum = 638ms, Average = 594ms Satellite (DVB) RX Status -------------------------------- State : Locked Frequency : 12.002470 GHz Symbol Rate : 14.000000 Msps FEC Code rate : 1/2 SNR : 11 dB Viterbi Error Rate : 0 Data Collection Methodology DVB-RCS Terminal

  6. Distribution of Downlink S/N Values Distribution Of Downlink Reported S/N Values Within Three Ping Value Categories (February 6 - March 4, 2005) All Ping Values Ping "Timeouts" Ping Values > 0 100 10 (%) Occurrence Frequency 1 0.1 0 2 4 6 8 10 12 Downlink S/N (dB)

  7. Data Collection MethodologyWeather Sources • Overview • For Weather Underground Data, Examine Monthly Summaries For Each WX Station, Download Daily Files Of Interest (Comma-Delimited Format) • For Controlled Station (MCI), Collect Data Directly From History File • Analyze Text Data (Using C-Program) From Differing Formats (Airport, “Personal”,MCI), Flag Missing And Errored Records • Convert Each Format To CommonTime (Day Number) And CommonPrecipitation (Incremental, Rain Rate, Daily Cumulative) Representations • Load To Spreadsheet For Analysis And Comparison With Radio Data Note: For Radio Applications, “Rain Rate” Is The Primary Parameter Of Interest. However, Because Of Differing Collection Systems, Algorithms, And Data Output Formats, Rain Rates At Different Sites Are Not Necessarily Directly Comparable (But Still Useful).

  8. Data Sources From Weather UndergroundExample For “Richardson TX” Location Nearby Airports Choice Of Month/Day/Year Personal Weather Stations (3 Shown, 14 Total Listed)

  9. Weather Underground Daily Output - “Airport” Formats “Formal” And Comma-Delimited DFW Airport April 25, 2005 - 9:53 AM – 12:53 PM (Note Accumulated Precipitation Is Reset After xx:53 Each Hr) 9:53 AM,57.0,50.0,77,29.81,8.0,NNW,8.1,-,0.00,Rain,Light Rain10:04 AM,55.4,51.8,88,29.80,2.5,NNE,9.2,-,0.06,Rain-Thunderstorm,Thunderstorms and Rain10:18 AM,53.6,51.8,94,29.79,4.0,ENE,9.2,-,0.11,Rain-Thunderstorm,Thunderstorms and Rain10:44 AM,55.4,51.8,88,29.77,9.0,ESE,12.7,-,0.12,,Overcast10:53 AM,55.9,52.0,87,29.76,9.0,ESE,10.4,-,0.12,Rain,Light Rain11:04 AM,55.4,51.8,88,29.76,5.0,ESE,12.7,-,0.00,Rain-Thunderstorm,Light Thunderstorms and Rain11:44 AM,57.2,53.6,88,29.75,5.0,East,6.9,-,0.05,Rain-Thunderstorm,Light Thunderstorms and Rain11:53 AM,57.9,55.0,90,29.74,7.0,ESE,9.2,-,0.05,Rain,Light Rain12:53 PM,64.9,57.9,78,29.70,10.0,SE,15.0,-,0.00,,Mostly Cloudy

  10. Weather Underground Monthly Summary - By Day DFW Airport January, 2005 - Comma-Delimited Format (Allows Rapid Identification Of “Rain Days”) • 2005-1-1,74,69,63,61,61,56,90,74,57,30.17,30.10,30.05,10,10,9,22,13,25,0.00,8,2005-1-2,68,64,60,65,61,59,100,92,84,30.20,30.13,30.09,10,5,0,23,9,29,0.79,6,Rain2005-1-3,76,67,58,68,64,56,100,87,74,30.17,30.11,30.07,10,6,0,22,12,29,1.57,8,Rain-Thunderstorm2005-1-4,70,63,56,66,57,54,100,91,81,30.13,30.09,29.89,10,5,1,21,10,26,0.10,8,Rain2005-1-5,68,49,29,64,45,23,100,88,75,30.21,29.98,29.85,10,6,2,25,17,31,0.17,7,Rain2005-1-6,35,30,24,25,18,14,85,68,51,30.28,30.17,30.06,10,10,10,22,11,25,0.00,6,2005-1-7,56,45,34,41,29,25,100,78,55,30.24,30.06,29.98,10,6,2,12,7,14,T,8,2005-1-8,52,42,31,39,32,28,92,76,59,30.37,30.29,30.24,10,7,4,13,6,16,0.00,5,2005-1-9,74,56,38,58,48,37,100,77,53,30.27,30.22,30.13,10,9,6,21,10,24,0.00,1,2005-1-10,73,65,57,64,57,56,100,81,61,30.15,30.09,29.95,10,6,2,23,13,28,0.00,4,2005-1-11,75,69,62,61,60,57,93,75,57,29.95,29.87,29.69,10,10,10,23,16,26,0.00,7,2005-1-12,70,65,60,61,56,27,87,57,27,29.68,29.58,29.45,10,10,6,30,20,38,0.05,7,Rain-Thunderstorm2005-1-13,61,49,37,36,30,21,70,49,27,30.35,30.02,29.62,10,10,10,36,16,43,T,5,2005-1-14,53,41,29,28,26,21,78,53,28,30.51,30.44,30.36,10,10,10,13,6,15,0.00,1,2005-1-15,50,42,33,30,28,26,82,62,42,30.63,30.54,30.48,10,10,10,15,8,16,0.00,2,2005-1-16,39,33,26,25,23,18,81,65,48,30.76,30.71,30.63,10,10,8,18,9,22,0.00,0,2005-1-17,46,34,22,28,21,17,78,64,49,30.69,30.64,30.57,10,10,10,10,5,12,0.00,0,2005-1-18,45,37,28,28,22,19,75,60,45,30.65,30.54,30.40,10,10,10,15,8,18,0.00,3,2005-1-19,65,51,36,45,37,29,77,63,48,30.39,30.33,30.22,10,10,10,15,6,17,0.00,4,2005-1-20,73,56,39,48,42,38,93,64,35,30.21,30.10,30.00,10,9,5,12,5,14,0.00,0,2005-1-21,79,61,42,48,42,39,89,59,29,29.99,29.92,29.84,10,10,8,13,6,15,0.00,1,2005-1-22,60,46,32,47,26,10,77,52,26,30.58,30.25,29.90,10,10,10,30,17,43,0.00,5,2005-1-23,42,33,23,20,12,10,60,45,29,30.59,30.50,30.38,10,10,10,21,9,23,0.00,1,2005-1-24,61,45,29,27,20,19,69,46,22,30.39,30.23,30.09,10,10,10,21,12,23,0.00,0,2005-1-25,79,60,41,41,32,27,65,44,23,30.06,29.91,29.76,10,10,10,24,11,28,0.00,2,2005-1-26,68,56,44,42,40,29,76,54,31,30.12,30.00,29.85,10,10,10,17,11,22,0.00,1,2005-1-27,52,46,40,39,34,32,92,68,44,30.26,30.20,30.12,10,6,2,18,11,22,0.70,6,Rain2005-1-28,43,41,38,39,37,36,100,91,82,30.20,30.20,30.07,8,4,1,15,7,17,0.14,8,Rain2005-1-29,47,44,41,40,39,38,93,82,71,30.22,30.14,30.13,10,6,1,10,5,13,0.01,8,2005-1-30,44,41,38,39,37,33,100,87,73,30.18,30.14,30.06,10,4,2,15,9,16,0.80,8,Rain2005-1-31,45,42,39,39,38,36,100,85,70,30.29,30.20,30.15,10,6,1,17,11,20,T,8,Rain

  11. Four Airport Weather Stations “Near” VSAT ES(ES-SAT Path Azimuth = 103.2 Deg, Elevation = 10.8 Deg) McKinney 16.8 mi To Satellite ES DFW 18.6 mi Love 11.1 mi Terrell 34.2 mi Note:WX Stations Shown Meet Basic Data Quality Criteria

  12. “Auxiliary” (Non-Airport) Weather Stations Of Interest MCI 1201A & Rowlett (Rowle7- Residence) McKinney 16.8 mi MCI 1201A 0.5 mi Rowlett 7.5 mi To Satellite ES DFW 18.6 mi Love 11.1 mi Terrell 34.2 mi Note:WX Stations Shown Meet Basic Data Quality Criteria

  13. Example Data Verification Weather Station Locations Terrell Airport WX Station 32 42 49 96 16 96 Rowlett 7 WX Station 32 55 17 96 35 05

  14. Rain Rates Data From 6 Weather Stations January 1 - April 30, 2005

  15. Rate Rain Data From 6 Weather StationJanuary 2, 2005 00:00 CST – 24:00 CST January 2, 2005 1 0.75 MCI 1201 Rowlett Terrell Rain Rate (In/Hr) 0.5 Love McKinney DFW 0.25 0 1 1.25 1.5 1.75 2 Day Number (January 2, 2005 @ 00:00 = 1)

  16. Selected Radio Parameters Mid-Band (13 GHz) H-Pol Rain RateAttenuation 1 in/hr 1.1 dB/km 2 in/hr 2.6 dB/km 3 in/hr 4.2 dB/km 4 in/hr 5.8 dB/km Beam Ht At Distance From ES (10.8 Degree Elevation Angle) DistanceHeight (AGL) 5 mi ~ 5,000 ft 10 mi ~10,000 ft 20 mi ~20,000 ft 30 mi ~30,000 ft

  17. AboveSome Height, “Rain” Is Not Present May 8, 2005 - Seven Of The Storms Tops Are Between 30,000 and 39,000 Feet (From Weather Underground)

  18. Example Fade Event - April 5, 2005Downlink Reported S/N Vs Time 16:00 CST - 20:00 CST 12 10 8 6 Downlink Reported S/N (dB) 4 2 0 94.64 94.66 94.68 94.7 94.72 94.74 94.76 94.78 94.8 94.82 94.84 94.86 Day Number (April 5 @ 00:00 = 94.00)

  19. Rain Rate Data From 6 Weather Stations April 5, 2005 16:00 CST - 20:00 CST(No Rain Reported At MCI 1201, Love)

  20. Example Fade Event - March 1-2, 2005Downlink Reported S/N Vs Time21:00 CST (March 1) - 12:00 CST (March 2) Day Number (March 2 @ 0.00 = 60.00)

  21. Rain Rate Data From 6 Weather Stations 21:00 CST (March 1) - 12:00 CST (March 2)

  22. Rain Rate Data From 3 Weather Stations 21:00 CST (March 1) - 12:00 CST (March 2)

  23. Example Fade Event - May 1, 2005Downlink Reported S/N Vs Time 6:00 CST (May 1) - 15:00 CST (May 1)

  24. Rain Rate Data From 6 Weather Stations 6:00 CDT (May 1) - 15:00 CDT (May 1) (At All Stations, No Rain On May 1)

  25. Final Comments • Readily Available Weather Data Has Been Useful In The Analysis Of A Ku-Band VSAT Radio System • Similar Methodology Can Be Used For Terrestrial Systems • Weather Underground Is An Excellent Resource • Current And Historical Weather Data Available • Suitable For “Casual” And More Detailed Investigations • Weather Data From Multiple Reporting Sites Is Beneficial • Provides Geographic Diversity, Clearer View Of Trends • Choices Can Include Selected “Personal” Weather Stations • Thanks - Nera, Hispasat, Weather Underground (weatherunderground.com) • Questions?

More Related