CHRCTERISTICS OF THE GPS SIGNL SCINTILLTIONS DURING IONOSPHERIC IRREGULRITIES ND THEIR EFFECTS OVER THE GPS SYSTEM Eurico R. de Paula, I.J.Kantor, L.F.C. de Rezende ERONOMY DIVISION NTIONL INSTITUTE FOR SPCE RESERCH ( INPE) IV SIMPÓSIO BRSILEIRO DE ENGENHRI INERCIL INPE 17 19 DE NOVEMBRO DE 2004
IDEL CONDITION FOR STELLITE ERTH COMMUNICTION
HOWEVER REL LIFE IS NOT THT ESY!!
OUTLINE
PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES ND THEIR CHRCTERISTICS. OUTLINE
OUTLINE PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES ND THEIR CHRCTERISTICS. DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH: SESON LOCL TIME SOLR CTIVITY MGNETIC CTIVITY
OUTLINE PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES ND THEIR CHRCTERISTICS. DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH: SESON LOCL TIME SOLR CTIVITY MGNETIC CTIVITY THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL
OUTLINE PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES ND THEIR CHRCTERISTICS. DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH: SESON LOCL TIME SOLR CTIVITY MGNETIC CTIVITY THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL THE EFFECTS OF IONOSPHERIC IRREGULRITIES OVER TEC
OUTLINE PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES ND THEIR CHRCTERISTICS. DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH: SESON LOCL TIME SOLR CTIVITY MGNETIC CTIVITY THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL THE EFFECTS OF IONOSPHERIC IRREGULRITIES OVER TEC POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES: LOSS OF LOCK DILUTION OF PRECISION INCRESE ( DEGRDTION ) DECRESE ON VILBLE NUMBER OF GPS STELLITES EFFECTS ON THE SBS ( SPCE BSED UGMENTTION SYSTEM ) EFFECTS ON THE DGPS (DIFFERENTIL GPS )
PHYSICL MECHNISM THT GIVE ORIGIN TO THE IONOSPHERIC IRREGULRITIES IONOSPHERIC IRREGULRITY GENERTION MECHNISM Rayleigh - Taylor (RT) instability Dungey (1956) Kelley (1989, pag. e 122) nimação gentilmente cedida por C. M. Denardini
IONOSPHERIC IRREGULRITIES CHRCTERISTICS
IONOSPHERIC IRREGULRITIES CHRCTERISTICS IONOSPHERIC IRREGULRITIES RE ELECTRON DENSITY DEPLETED REGIONS OF THE IONOSPHERIC PLSM
IONOSPHERIC IRREGULRITIES CHRCTERISTICS IONOSPHERIC IRREGULRITIES RE ELECTRON DENSITY DEPLETED REGIONS OF THE IONOSPHERIC PLSM GENERTED T THE EQUTORIL REGION FTER SUNSET ( UP TO MIDNIGHT DURING QUIET MGNETIC CONDITIONS ) ND THEY CN EVOLUTE TO LRGE DEPLETED STRUCTURES CLLED BUBBLES.
IONOSPHERIC IRREGULRITIES CHRCTERISTICS IONOSPHERIC IRREGULRITIES RE ELECTRON DENSITY DEPLETED REGIONS OF THE IONOSPHERIC PLSM GENERTED T THE EQUTORIL REGION FTER SUNSET ( UP TO MIDNIGHT DURING QUIET MGNETIC CONDITIONS ) ND THEY CN EVOLUTE TO LRGE DEPLETED STRUCTURES CLLED BUBBLES.
IONOSPHERIC IRREGULRITIES CHRCTERISTICS THE EFFECTS RE IN THE TROPICL REGION LL OVER THE WORLD WITH LRGEST INCIDENCE OVER BRZIL ( LRGE MGNETIC DECLINTION ).
IONOSPHERIC IRREGULRITIES CHRCTERISTICS THE IONOSPHERIC IRREGULRITIES HVE MNY SCLE SIZES (cms. to Kms. ) SO THEY FFECT SEVERL TRNSMISSION FREQUENCIES ( HF TO SEVERL GHz ).
IONOSPHERIC IRREGULRITIES CHRCTERISTICS THE IONOSPHERIC IRREGULRITIES HVE MNY SCLE SIZES (cms. to Kms. ) SO THEY FFECT SEVERL TRNSMISSION FREQUENCIES ( HF TO SEVERL GHz ). THEY HVE LRGE DY-TO-DY VRIBILITY.
IONOSPHERIC IRREGULRITIES CHRCTERISTICS THE IONOSPHERIC IRREGULRITIES HVE MNY SCLE SIZES (cms. to Kms. ) SO THEY FFECT SEVERL TRNSMISSION FREQUENCIES ( HF TO SEVERL GHz ). THEY HVE LRGE DY-TO-DY VRIBILITY. DURING MGNETICLLY QUIET PERIODS THEY DRIFT FROM WEST TO EST WITH VELOCITY OF BOUT 150 m / s. ( SHOWED T NEXT SLIDE ).
IONOSPHERIC IRREGULRITIES CHRCTERISTICS BUBBLE ESTWRD DISPLCEMENT ( 21 01 LT ) N LL SKY PHOTOMETER 6300 Å, MRCH 18 1999, CCHOEIR PULIST. w E BUBBLES RE ELECTRON DENSITY DEPLETED REGIONS ND CONSEQUENTLY THERE IS DRSTIC REDUCTION IN THE EROLUMINESCENCE INTENSITY OVER THESE REGIONS. S
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH LOCL TIME SESONL EFFECTS IONOSPHERIC IRREGULRITIES OCCURRENCES FROM SEPTEMBER TO MRCH
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH LOCL TIME ND SOLR CTIVITY ) ) ) 2F.F.X:UU 77HQ 03F.HR 04I1/ E-D,Q3G/V8F.L Q3W9LOO D,W9L R4Q3Y;H0U7V8X:V8W9L P2HD 0,Q3G/P2R4Q3W9K I1R4U7W9K U7H0H0\ H0D,U7V8R4I1L Q3F.U7H0D,V8L Q3J V8R4O D,U7D,F.W9L Y;L W9\
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH MGNETIC CTIVITY
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH MGNETIC CTIVITY THE MGNETIC STORM CN INHIBIT THE IRREGULRITIES DURING THEIR OCCURRENCE PERIOD.
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH MGNETIC CTIVITY THE MGNETIC STORM CN INHIBIT THE IRREGULRITIES DURING THEIR OCCURRENCE PERIOD. OTHERWISE THE MGNETIC STORM CN TRIGGER IRREGULRITIES T NY MONTH OF THE YER (EVEN DURING PERIOD OF NON OCCURRENCE ). ONE EXMPLE FOLLOWS T NEXT SLIDE:
DEPENDENCE OF IONOSPHERIC IRREGULRITIES WITH MGNETIC CTIVITY
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL THE ERTH IONOSPHERE, THT IS N IONIZED TMOSPHERIC LYER, CUSES DELY IN THE GPS SIGNL THT PROPGTES WITH THE GROUP VELOCITY (V g ) THT IS SMLL THN LIGHT VELOCITY.
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL THE ERTH IONOSPHERE, THT IS N IONIZED TMOSPHERIC LYER, CUSES DELY IN THE GPS SIGNL THT PROPGTES WITH THE GROUP VELOCITY (V g ) THT IS SMLL THN LIGHT VELOCITY. THIS IONOSPHERIC DELY IS PROPORTIONL TO THE TOTL ELECTRON CONTENT LONG THE GPS SIGNL.
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL THE ERTH IONOSPHERE, THT IS N IONIZED TMOSPHERIC LYER, CUSES DELY IN THE GPS SIGNL THT PROPGTES WITH THE GROUP VELOCITY (V g ) THT IS SMLL THN LIGHT VELOCITY. THIS IONOSPHERIC DELY IS PROPORTIONL TO THE TOTL ELECTRON CONTENT LONG THE GPS SIGNL. OVER LOW MGNETIC LTITUDES ( BRZIL FOR EXMPLE) THE IONOSPHERE PRESENTS THE EQUTORIL IONOSPHERIC NOMLY THT CONSTITUTES OF HIGHER ELECTRON DENSITIES PEKS T BOUT 15 MGNETIC DEGREES (NORTH ND SOUTH) COMPRED TO EQUTORIL REGION.
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL 3!/ 27) %5#207%20 '(+ (/ )$$ )('(5#$/ $9 ', $7%, 21$'0, 1, 6$7%5#$7%, 21 8&6$ $
THE EFFECTS OF THE IONOSPHERIC TOTL ELECTRON CONTENT (TEC) OVER GPS SIGNL
THE EFFECTS OF IONOSPHERIC IRREGULRITIES OVER TEC IONOSPHERIC IRREGULRITIES CUSE LRGE DEPLETION ON THE TOTL ELECTRON CONTENT. 3!/ 27) %5#207%20 '(+ (/ )$$ )('(5#$/ $9 ', $7%, 21$'0, 1, 6$7%5#$7%, 21 8&6$ $
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES IONOSPHERIC SCINTILLTION Ionosphere WBP (db) 42 40 38 36 34 3100 3120 3140 3160 3180 3200 3220 3240 3260 3280 3300 Tempo (s) v
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES SCINTMON RECEIVERS SITES OVER BRZIL
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES SCINTMON RECEIVERS SITES OVER BRZIL TO NLYSE THE GPS SCINTILLTIONS OVER BRZIL, WE USE N RRY OF 12 SCINTILLTION MONITORS ( L1 BND T 1.575 GHz ) LOCTED T 8 SITES
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES SCINTMON RECEIVERS SITES OVER BRZIL TO NLYSE THE GPS SCINTILLTIONS OVER BRZIL, WE USE N RRY OF 12 SCINTILLTION MONITORS ( L1 BND T 1.575 GHz ) LOCTED T 8 SITES TO QUNTIFY THE MPLITUDE SCINTILLTION, WE USE THE S4 INDEX THT IS THE STNDRD DEVITION OF THE SIGNL INTENSITY RELTIVE TO THE VERGE CLCULTED T ECH MINUTE:
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES EXMPLE OF GPS IONOSPHERIC SCINTILLTION: WBP(dB) S4 44 42 40 38 36 34 32 30 28 1,0 0,8 0,6 0,4 0,2 27/12/2000 - PRN 27 São Luís 0,0 21 22 23 24 25 26 27 28 29 Hora Universal
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES LOSS OF LOCK Navigation and positionig information are affected during loss of lock. Source: Paul Kintner et al.: GPS FDING TIMESCLES ND CONSEQUENCES, Radio Science, 2001
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES DILUTION OF PRECISION INCRESE ( DEGRDTION ) ND DECRESE ON VILBLE NUMBER OF GPS STELLITES
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES EFFECTS ON THE SBS ( SPCE BSED UGMENTTION SYSTEM ) MESSGES TO GEOSTTIONRY STELLITES RE FFECTED.
POTENTIL EFFECTS OF SCINTILLTIONS ON GPS CUSED BY IONOSPHERIC IRREGULRITIES EFFECTS ON THE DGPS (DIFFERENTIL GPS ) /7,21263+(5,&6&,17,//$7,21$76-&$0326 [[[[ 12'*36,13(752%5È6'<1$0,&326,7,21 9(66(/63(5)250,1*'((3:$7(53(752/(80 (;3/25$7,21$7&$0326%$6,15-,10$56$7/%$1'6,*1$/352%/(06 '8(72,21263+(5,&,55(*8/$5,7,(6
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO:
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS )
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS ) TO USE DUL FREQUENCY RECEIVERS ( EXPENSIVE SOLUTION )
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS ) TO USE DUL FREQUENCY RECEIVERS ( EXPENSIVE SOLUTION ) TO IMPLEMENT SPCE BSED UGMENTTION SYSTEM ( SBS )
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS ) TO USE DUL FREQUENCY RECEIVERS ( EXPENSIVE SOLUTION ) TO IMPLEMENT SPCE BSED UGMENTTION SYSTEM ( SBS ) IONOSPHERIC SCINTILLTIONS
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS ) TO USE DUL FREQUENCY RECEIVERS ( EXPENSIVE SOLUTION ) TO IMPLEMENT SPCE BSED UGMENTTION SYSTEM ( SBS ) IONOSPHERIC SCINTILLTIONS TO INCRESE THE NUMBER OF VILBLE STELLITES ( GLILEO )
SUGGESTIONS TO IMPROVE THE GPS PERFORMNCE DUE TO: TOTL ELECTRON CONTENT ( WITHOUT SCINTILLTIONS ) TO USE DUL FREQUENCY RECEIVERS ( EXPENSIVE SOLUTION ) TO IMPLEMENT SPCE BSED UGMENTTION SYSTEM ( SBS ) IONOSPHERIC SCINTILLTIONS TO INCRESE THE NUMBER OF VILBLE STELLITES ( GLILEO ) TO BUILD MORE ROBUST RECEIVERS, DECRESING THE BNDWIDTH OF GPS CRD ( HOWEVER THIS PROCEDURE CUSE INCRESE THE NUMBER OF LOSS OF LOCK ).