Ndedzipi nzira nhatu dzakasiyana dzeSAR dzepolarization?

1. Chii chinonzi SARkupatsanurana?
Polarization: H horizontal polarization; V vertical polarization, kureva kuti, vibration direction ye electromagnetic field. Kana satellite ikatumira chiratidzo pasi, vibration direction ye radio wave inoshandiswa inogona kuva munzira dzakawanda. Idzo dziri kushandiswa parizvino ndeidzi:

Kupokana kwakatambanudzwa (H-horizontal): Kupokana kwakatambanudzwa zvinoreva kuti kana satellite ikatumira chiratidzo pasi, divi rekutenderera remafungu ayo eredhiyo rakatambanudzwa. Kupokana kwakatambanudzwa (V-vertical): Kupokana kwakatambanudzwa zvinoreva kuti kana satellite ikatumira chiratidzo pasi, divi rekutenderera remafungu ayo eredhiyo rakatambanudzwa.

Kutumirwa kwemafungu emagetsi kunokamurwa kuita mafungu akatwasuka (H) nemafungu akatwasuka (V), uye kugamuchira kunokamurwawo kuita mafungu eH naV. Sisitimu yeradar inoshandisa H naV linear polarization inoshandisa zviratidzo zviviri kumiririra kutumirwa uye kugamuchira polarization, saka inogona kuva nenzira dzinotevera—HH, VV, HV, VH.

(1) HH - yekutumira tambo yakatwasuka uye kugamuchira tambo yakatwasuka

(2) VV - yekutumira mutsetse wakamira uye kugamuchira mutsetse wakamira

(3) HV - yekutumira tambo yakatwasuka uye kugamuchira tambo yakatwasuka

(4) VH - yekutumira zvakananga uye kugamuchira yakatwasuka

Misanganiswa miviri yekutanga yeiyi polarization inonzi polarizations yakafanana nekuti transmit nereceive polarizations zvakafanana. Misanganiswa miviri yekupedzisira inonzi cross polarizations nekuti transmit nereceive polarizations dzine orthogonal kune mumwe nemumwe.

2. Chii chinonzi single polarization, dual polarization, uye full polarization muSAR?

Kupatsanurana kwega kunoreva (HH) kana (VV), zvinoreva (kutapurirana kwakatambanuka uye kugamuchira kwakatwasuka) kana (kutapurirana kwakatwasuka uye kugamuchira kwakatwasuka) (kana uri kudzidza nezve radar yemamiriro ekunze, kazhinji i (HH).)

Dual polarization zvinoreva kuwedzera imwe polarization mode kune imwe polarization mode, senge (HH) horizontal transmission uye horizontal reception + (HV) horizontal transmission uye vertical reception.

Tekinoroji yepolarization yakazara ndiyo yakaoma zvikuru, inoda kutumirwa kweH neV panguva imwe chete, kureva kuti, nzira ina dzepolarization dze (HH) (HV) (VV) (VH) dziripo panguva imwe chete.

Masisitimu eRadar anogona kuva nemazinga akasiyana ekuoma kwepolarization:

(1) Kupatsanurana kwega kwega: HH; VV; HV; VH

(2)Kupatsanurana kaviri: HH+HV; VV+VH; HH+VV

(3) Kupatsanurana kunana: HH+VV+HV+VH

Maradar eOrthogonal polarization (kureva kuti full polarization) anoshandisa aya mapolarization mana uye anoyera musiyano wechikamu pakati pemachannel pamwe neamplitude. Mamwe maradar e dual-polarization anoyerawo musiyano wechikamu pakati pemachannel, sezvo chikamu ichi chichiita basa rakakosha mukubvisa ruzivo rwepolarization.

Mifananidzo yeradar satellite. Panyaya yepolarization, zvinhu zvakasiyana-siyana zvinoonekwa zvinoparadzira mafungu akasiyana epolarization kune mafungu akasiyana epolarization. Nokudaro, space remote sensing inogona kushandisa mabhendi akawanda kuwedzera ruzivo, kana kushandisa polarizations dzakasiyana kuti iwedzere uye ivandudze kururama kwekuzivikanwa kwechinangwa.

3. Ungasarudza sei nzira ye SAR radar satellite ine polarization?

Zvakaitika zvinoratidza kuti:

Pakushandiswa kwemvura, HH polarization yeL band inonyanya kunzwisisika, nepo VV polarization yeC band iri nani;

Kune huswa nemigwagwa zvisina kupararira zvakanyanya, polarization yakatwasuka inoita kuti zvinhu zvive nemusiyano mukuru, saka SAR yemuchadenga inoshandiswa pakugadzira mapu enzvimbo inoshandisa polarization yakatwasuka; kune ivhu rine roughness yakakura kupfuura wavelength, hapana shanduko iri pachena muHH kana VV.

Simba re echo rechinhu chimwe chete pasi pe polarizations dzakasiyana rakasiyana, uye toni yemufananidzo yakasiyanawo, izvo zvinowedzera ruzivo rwekuziva chinangwa chechinhu. Kuenzanisa ruzivo rwe polarization imwechete (HH, VV) uye cross-polarization (HV, VH) kunogona kuwedzera zvakanyanya ruzivo rwemufananidzo we radar, uye musiyano weruzivo pakati pe polarization emiti nezvimwe zvinhu zvakasiyana unonyanya kunzwisisika kupfuura musiyano uripo pakati pemabhandi akasiyana.
Saka, mukushandiswa kwazvino, nzira yakakodzera yekuparadzanisa inogona kusarudzwa zvichienderana nezvinodiwa zvakasiyana, uye kushandiswa kwakazara kwenzira dzakawanda dzekuparadzanisa kunobatsira pakuvandudza kururama kwekupatsanura zvinhu.