Waa maxay saddexda nooc ee kala duwan ee kala-soocidda SAR?

1. Waa maxay SARkala qaybsanaan?
Kala-goynta: Kala-goynta toosan ee H; Kala-goynta toosan ee V, taas oo ah, jihada gariirka ee goobta elektromagnetic-ka. Marka dayax-gacmeedku uu calaamad u gudbiyo dhulka, jihada gariirka ee hirarka raadiyaha ee la isticmaalo waxay noqon kartaa siyaabo badan. Kuwa hadda la isticmaalo waa:

Kala-goynta Jiifka (H-horizontal): Kala-goynta Jiifka macnaheedu waa marka dayax-gacmeedku uu calaamad u gudbiyo dhulka, jihada gariirka hirarkiisa raadiyaha waa mid toosan. Kala-goynta Jiifka (V-togan): Kala-goynta Jiifka macnaheedu waa marka dayax-gacmeedku uu calaamad u gudbiyo dhulka, jihada gariirka hirarkiisa raadiyaha waa mid toosan.

Gudbinta hirarka elektromagnetka waxaa loo qaybiyaa hirar jiif ah (H) iyo hirar toosan (V), soo dhawayntuna waxay sidoo kale u qaybsantaa H iyo V. Nidaamka radar-ka ee isticmaalaya H iyo V polarization toosan wuxuu adeegsadaa labo calaamadood si uu u matalo polarization-ka gudbinta iyo soo dhawaynta, sidaas darteed wuxuu yeelan karaa kanaallada soo socda—HH, VV, HV, VH.

(1) HH - gudbinta toosan iyo soo dhawaynta jiifa

(2) VV - gudbinta toosan iyo soo dhawaynta toosan

(3) HV - gudbinta toosan iyo soo dhawaynta toosan

(4) VH - gudbinta toosan iyo soo dhawaynta jiifa

Labada ugu horreeya ee isku-darka kala-goynta waxaa loogu yeeraa kala-goynta isku midka ah sababtoo ah kala-goynta kala-goynta iyo kala-goynta la gudbiyo waa isku mid. Labada isku-darka ee ugu dambeeya waxaa loogu yeeraa kala-goynta kala-goynta sababtoo ah kala-goynta kala-goynta iyo kala-goynta la gudbiyo waa isku mid.

2. Waa maxay hal-ka-kala-soocid, laba-kala-soocid, iyo kala-soocid buuxda oo ku jirta SAR?

Kala-goyn keli ah waxaa loola jeedaa (HH) ama (VV), taasoo macnaheedu yahay (gudbinta toosan iyo qaabilaadda toosan) ama (gudbinta toosan iyo qaabilaadda toosan) (haddii aad baranayso cilmiga radar-ka saadaasha hawada, guud ahaan waa (HH).)

Kala-goyn laba-geesood ah waxaa loola jeedaa in lagu daro qaab kale oo kala-goyn ah hal qaab oo kala-goyn ah, sida gudbinta toosan (HH) iyo gudbinta toosan + (HV) iyo soo-dhoweynta toosan.

Tiknoolajiyadda buuxda ee kala-goynta ayaa ah tan ugu adag, taasoo u baahan gudbinta isku mar ah ee H iyo V, taas oo ah, afarta qaab ee kala-goynta (HH) (HV) (VV) (VH) ayaa isku mar jira.

Nidaamyada radar waxay yeelan karaan heerar kala duwan oo kakanaanta kala-goynta:

(1) Kala-fogaansho keli ah: HH; VV; HV; VH

(2)Kala-qaybsanaanta laba-geesoodka ah: HH+HV; VV+VH; HH+VV

(3) Afar kala-goyn: HH+VV+HV+VH

Raadaarada kala-goysyada toosan (tusaale ahaan kala-goysyada buuxa) waxay isticmaalaan afartan kala-goysyada waxayna cabbiraan farqiga wejiga ee u dhexeeya kanaallada iyo sidoo kale baaxadda. Raadaarada laba-geesoodka ah qaarkood waxay sidoo kale cabbiraan farqiga wejiga ee u dhexeeya kanaallada, maadaama wejigani uu door muhiim ah ka ciyaaro soo saarista macluumaadka kala-goysyada.

Sawirka dayax-gacmeedka Radar Marka la eego kala-goynta, walxaha kala duwan ee la arkay waxay dib u kala firdhiyaan hirarka kala-goynta kala duwan ee hirarka kala-goynta ee dhacdooyinka kala duwan. Sidaa darteed, dareenka fog ee hawada sare wuxuu isticmaali karaa kooxo badan si loo kordhiyo macluumaadka, ama loo isticmaalo kala-goynta kala duwan si loo xoojiyo loona hagaajiyo saxnaanta aqoonsiga bartilmaameedka.

3. Sidee loo doortaa qaabka kala-soocidda ee dayax-gacmeedka radar-ka SAR?

Waayo-aragnimadu waxay muujinaysaa in:

Codsiyada badda, kala-soocidda HH ee kooxda L waa mid aad u xasaasi ah, halka kala-soocidda VV ee kooxda C ay ka fiican tahay;

Cawska iyo waddooyinka kala firdhisan ee hooseeya, kala firdhinta toosan waxay ka dhigtaa walxaha inay leeyihiin kala duwanaansho weyn, sidaa darteed SAR-ka hawada sare ee loo isticmaalo khariidaynta dhulka wuxuu adeegsadaa kala firdhinta toosan; dhulka leh qallafsanaan ka weyn hirarka, ma jiro isbeddel muuqda oo ku yimaada HH ama VV.

Xoogga echo ee shayga isku midka ah ee hoos yimaada kala-goynta kala duwan waa kala duwan yahay, codka sawirkuna sidoo kale waa ka duwan yahay, taas oo kordhinaysa macluumaadka lagu aqoonsanayo bartilmaameedka shayga. Isbarbardhigga macluumaadka isku-dhafka ah (HH, VV) iyo kala-goynta iskutallaabta (HV, VH) waxay si weyn u kordhin kartaa macluumaadka sawirka radar, farqiga macluumaadka ee u dhexeeya echo-yada kala-goynta ee dhirta iyo walxaha kale ee kala duwan ayaa ka xasaasisan farqiga u dhexeeya kala-goysyada kala duwan.
Sidaa darteed, codsiyada wax ku oolka ah, qaabka polarization-ka ee ku habboon ayaa loo dooran karaa iyadoo loo eegayo baahiyo kala duwan, isticmaalka dhammaystiran ee hababka polarization-ka ee badanina wuxuu ku habboon yahay hagaajinta saxnaanta kala soocidda walxaha.