He aha ngā momo whakapolarization rerekē e toru o te SAR?

1. He aha te SARte whakapolarisasi?
Te whakapūtanga: Te whakapūtanga whakapae H; Te whakapūtanga poutū V, arā, te ahunga wiri o te papa hikohiko. Ina tukuna e te amiorangi he tohu ki te whenua, he maha ngā huarahi e taea ai te huri i te ahunga wiri o te ngaru reo irirangi. Ko ngā mea e whakamahia ana i tēnei wā ko:

Te whakapūtanga whakapae (H-whakapae): Ko te whakapūtanga whakapae ko te ahunga wiri o tana ngaru reo irirangi ka whakapae ina tukuna e te amiorangi he tohu ki te whenua. Te whakapūtanga poutū (V-poutū): Ko te whakapūtanga poutū ko te ahunga wiri o tana ngaru reo irirangi ka poutū ina tukuna e te amiorangi he tohu ki te whenua.

Ka wehea te tuku ngaru hikohiko ki ngā ngaru whakapae (H) me ngā ngaru poutū (V), ā, ka wehea hoki te whiwhinga ki ngā ngaru H me V. Ko te pūnaha radar e whakamahi ana i te pōraihana rārangi H me V e whakamahi ana i ngā tohu takirua hei tohu i te pōraihana tuku me te whiwhinga, nō reira ka taea e ia te whai i ēnei hongere—HH, VV, HV, VH.

(1) HH - mō te tuku whakapae me te whiwhinga whakapae

(2) VV - mō te tuku poutū me te whiwhinga poutū

(3) HV - mō te tuku whakapae me te whiwhinga poutū

(4) VH - mō te tuku poutū me te whiwhinga whakapae

Ko ngā huinga tuatahi e rua o ēnei whakakotahitanga pōraritanga ka kiia he pōraritanga ōrite nā te mea he ōrite ngā pōraritanga tuku me ngā pōraritanga whiwhi. Ko ngā huinga whakamutunga e rua ka kiia he pōraritanga whakawhiti nā te mea he orthogonal te pōraritanga tuku me ngā pōraritanga whiwhi tetahi ki tetahi.

2. He aha te pōra kotahi, te pōra takirua, me te pōra katoa i roto i te SAR?

Ko te whakapūtanga kotahi e pā ana ki (HH) (VV rānei), ko tōna tikanga (te tuku whakapae me te whiwhinga whakapae) (te tuku poutū me te whiwhinga poutū) rānei (mēnā kei te ako koe i te mara o te radar huarere, ko te tikanga ko (HH).)

Ko te whakapōraru takirua e pā ana ki te tāpiri i tētahi atu aratau whakapōraru ki tētahi aratau whakapōraru, pērā i te tuku whakapae (HH) me te whiwhinga whakapae + tuku whakapae (HV) me te whiwhinga poutū.

Ko te hangarau whakapōraru katoa te mea tino uaua, me tuku tahi te H me te V, arā, ko ngā momo whakapōraru e whā o (HH) (HV) (VV) (VH) kei te noho tahi i te wā kotahi.

Ka taea e ngā pūnaha radar te whai i ngā taumata rerekē o te uauatanga o te porowhita:

(1) Te whakapōrotanga kotahi: HH; VV; HV; VH

(2)Te whakawehewehenga takirua: HH+HV; VV+VH; HH+VV

(3) Ngā whakapōraruraru e whā: HH+VV+HV+VH

Ka whakamahia e ngā radar pōrarization orthogonal (arā, te pōrarization katoa) ēnei pōrarization e whā, ā, ka ine i te rerekētanga āhua i waenga i ngā hongere me te kaha hoki. Ka ine anō hoki ētahi radar pōrarization-rua i te rerekētanga āhua i waenga i ngā hongere, nā te mea he mahi nui tā tēnei āhua i roto i te tango mōhiohio pōrarization.

Whakaahua amiorangi radar Mō te whakapūtanga, ka marara whakamuri ngā mea rerekē kua tirohia ki ngā ngaru whakapūtanga rerekē mō ngā ngaru whakapūtanga taunga rerekē. Nō reira, ka taea e te pūoko mamao o te wāhi te whakamahi i ngā roopu maha hei whakanui ake i te ihirangi mōhiohio, te whakamahi rānei i ngā whakapūtanga rerekē hei whakarei ake me te whakapai ake i te tika o te tautuhi ūnga.

3. Me pēhea te whiriwhiri i te aratau whakapolarisasi o te amiorangi radar SAR?

E whakaatu ana ngā wheako:

Mō ngā tono moana, he tairongo ake te pōraritanga HH o te roopu L, engari he pai ake te pōraritanga VV o te roopu C;

Mō te tarutaru me ngā rori e iti ana te marara, ka nui ake ngā rerekētanga o ngā mea nā te whakapūtanga whakapae, nō reira ka whakamahia e te SAR mokowā e whakamahia ana mō te mahere whenua te whakapūtanga whakapae; mō te whenua he nui ake te taratara i te roanga ngaru, kāore he huringa mārama o te HH, o te VV rānei.

He rerekē te kaha o te whakaata o te mea kotahi i raro i ngā pōraihana rerekē, ā, he rerekē anō hoki te oro o te ahua, ka nui ake ngā mōhiohio hei tautuhi i te mea e whaia ana. Mā te whakataurite i ngā mōhiohio o te pōraihana kotahi (HH, VV) me te pōraihana whakawhiti (HV, VH) ka nui ake te mōhiohio o te ahua radar, ā, he tairongo ake te rerekētanga mōhiohio i waenga i ngā whakaata pōraihana o te tipu me ētahi atu mea rerekē i te rerekētanga i waenga i ngā roopu rerekē.
Nō reira, i roto i ngā mahi whaihua, ka taea te whiriwhiri i te aratau pōraritanga tika kia rite ki ngā hiahia rerekē, ā, mā te whakamahi whānui i ngā aratau pōraritanga maha ka pai ake te tika o te whakarōpūtanga o ngā mea.