Feasibility Study for Reconstructing the Spatial-Temporal Structure of TIDs from High-Resolution Backscatter Ionograms
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1 Feasbl Su for Reconsrucng he Spaal-Temporal Srucure of TIDs from Hgh-Resoluon Backscaer Ionograms Dr. L. J. Ncksch, Dr. Serge Frman, Dr. Mark Hausman NorhWes Research Assocaes, Monere, Calforna Dr. Geoffre S. San Anono Naval Research Laboraor, Raar Dvson Presene a he 05 Ionospherc Effecs Smposum Ma 05
2 Movaon Meum-scale TIDs can cause large geolocaon errors for over-he-horon (OTH raar Apparen arge locaon swngs of ens of klomeers n 5-0 mnues ROTHR-Vrgna reurn from saonar ransponer n Jamaca Amuh 80 km Tme uraon:.5 hours
3 Movaon (con. OTH raars rounel collec backscaer sounngs We Sweep Backscaer Ionogram (WSBI Surface cluer reurns as a funcon of ela an ransmsson frequenc for a span of amuhs Can nformaon from WSBIs be use o nfer TID srucure n real me?
4 GPS Ionospherc Inverson (GPSII The algorhm can assmlae verse TEC-relae aa obane on ransonospherc propagaon pahs GPS L/L beacon sgnals GPSII > Dual frequenc group ela aa (absolue TEC > Dual frequenc phase ela aa (relave TEC TEC aa obane wh LEO beacons Occulaon-pe oblque TEC from space-base recevers (CHAMP, COSMIC, DORIS Oher aa pes Vercal/Oblque sounngs (especall mporan for HF skwave applcaons HF backscaer sounngs On-boar plasma ens measuremens from saelles (such as CHAMP, DMSP Doppler sounng aa 4
5 The Ionospherc Reconsrucon Problem: Tkhonov Meho N( r, = N U = 0 ( r, e u( r, { u( r, }, Bases} Y M[ U ] Y s he se of measure absolue/relave TEC values an aa pons from oher pes of onospherc measuremens. The soluon mus f he aa whn errors of measuremens. ( Y M[ U ] T S ( Y M[ U ] m( Y There are nfnel man such soluons: The smoohes soluon s selece b mnmng he sablng funconal Error covarance mar U T P U mn Pseuo-covarance mar -The pseuo-covarance P mar s efne n such a wa ha he sablng funconal ens o ake on larger values for unreasonabl behavng soluons ( reasonable smooh. -The nonlnear opmaon problem s solve eravel (Newon- Konorovch. 5
6 Snhec We-Sweep Backscaer Ionogram Generae b NWRA HCIRF coe 6
7 Real OTHR Backscaer Ionogram Encompasses ~0 amuhal swah 7
8 Can WSBI leang ege srucure be assmlae o epose TIDs? ROTHR WSBIs are collece usng onl he en 8 elemens of s 7 elemen receve arra Yels ~0 amuhal resoluon Use of full aperure woul allow WSBIs wh ~ spacng Allows eecon of leang ege TID srucure Assmlang WSBI leang ege aa woul be an ecellen wa of mgang TID effecs on OTHR CR WSBIs are rounel collece b OTHR WSBIs ensel sample he OTHR operaonal fel of vew Moern gal echnolog wll allow ne generaon OTHR o collec WSBIs usng he full receve aperure whou mpacng he survellance msson of he raar Full-aperure WSBIs were collece on ROTHR b Dr. Geoff San Anono (NRL n an epermenal confguraon of ROTHR 8
9 Hgh-Resoluon Leang Ege Daa Color conours span 5 (blue o 7 (re MH 4000 WSBI Leang Ege as Funcon of Frequenc Full aperure WSBI leang ege measuremens collece b Dr. Geoffre San Anono (NRL Smulae WSBI leang eges usng NWRA ra racng n TID moel 9
10 The Hooke TID moel was ncorporae no NWRA s ra racng coe Hooke, W. H., Ionospherc rregulares prouce b nernal amospherc grav waves, Geophscal Monograph Seres, The Upper Amosphere n Moon, Vol. 8, pp , 968 0
11 Generae snhec hgh-resoluon WSBI leang ege aa: Known ruh aa 4 5JAN4-900 Leang Ege 0-4 MH Blue Re 0 8 Laue Longue
12 Mofe GPSII o assmlae h-res leang ege aa n n n n U U U ν γ γ = s e T e τ τ = γ π = γ cos f s f s e e e τ τ τ τ = γ = γ = α α α = ( v f F = :] [ 4 5 ( v = ( ( ( ( ( ( ( ( ( :] [ v,,,,,, ( = γ γ = β = α β α γ β α < < < = k k k k k k k j j j k j v v v f F
13 Sample Inpu Daa 4 5JAN4-90 Leang Ege 0-4 MH Blue Re 4 5JAN4-94 Leang Ege 0-4 MH Blue Re 4 5JAN4-98 Leang Ege 0-4 MH Blue Re Laue 6 4 Laue 6 4 Laue Longue Longue Longue 4 5JAN4-9 Leang Ege 0-4 MH Blue Re 4 5JAN4-96 Leang Ege 0-4 MH Blue Re 4 5JAN4-940 Leang Ege 0-4 MH Blue Re Laue 6 4 Laue 6 4 Laue Longue Longue Longue Samples separae b 4 mnues n me spannng 0 mnue pero of TID
14 Sample Oupu: Plasma frequenc (MH a 50 km alue 4
15 Comparson of Oupu o Truh Oupu Truh 5
16 Fuure plans Resul of snhec feasbl su s encouragng Ths work wll connue over he ne wo ears Collec full aperure WSBI aa on ROTHR n conjuncon wh fe ransponer aa A capabl for assmlang surface cluer Doppler aa Fel an ASTRA TIDDBIT ssem n he fel of vew of ROTHR o collec nepenen TID aa for comparson (Dr. Geoff Crowle 6
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