Kupatsanurana kweSARinotsanangura kurongeka kwesimba remagetsi rinotumirwa uye rinogamuchirwa nesystem yeradar yeaperture yakagadzirwa. Nekuti nzvimbo dzakasiyana uye maumbirwo anopararira minda yakatwasuka uye yakatwasuka zvakasiyana, polarization ndeimwe yemhando dzinobatsira zvikuru pakududzira mifananidzo yeSAR.
Gwaro iri rinotsanangura nzira ina dzekubatanidza polarization - HH, HV, VH neVV - uye nzira nhatu dzinowanzo shandiswa dzekuwana: polarization imwe chete, polarization mbiri uye polarization yakazara (quad). Rinotsanangurawo kuti mainjiniya vanosarudza sei modhi yekuona kure, kuyedza radar uye kuongorora antenna-system.
Chii chinonzi SAR Polarization?
Mazhinji masisitimu eSAR ane spaceborne anoshandisa horizontal (H) uye vertical (V) linear polarization. Kodhi yechiteshi ine mavara maviri inotanga yaratidza transmitted polarization uye received polarization yechipiri. Semuenzaniso, HH zvinoreva horizontal transmit uye horizontal receive, ukuwo HV ichireva horizontal transmit uye vertical receive.
Polarization inokosha nekuti chinangwa chinogona kuchengetedza polarization yechiitiko, kuchitenderedza kana kubvisa polarizer chikamu chekudzoka. Kuomarara kwenzvimbo, geometry, dielectric properties, wavelength, incidence angle uye chimiro chemukati zvese zvinopesvedzera backscatter yakayerwa. Saka polarization inofanira kududzirwa pamwe chete ne frequency band, viewing geometry uye calibrated image data.
Zvinorevei HH, HV, VH uye VV?
| Chiteshi | Tumira | Gamuchira | Kupatsanura |
|---|---|---|---|
| HH | Yakarara | Yakarara | Yakasanganiswa pamwe chete |
| HV | Yakarara | Yakamira | Yakapatsanurwa |
| VH | Yakamira | Yakarara | Yakapatsanurwa |
| VV | Yakamira | Yakamira | Yakasanganiswa pamwe chete |
HH neVV inzira dzinobatanidza polarized nekuti transmit nereceive polarizations dzakafanana. HV neVH nzira dzinobatanidza polarized nekuti polarization inopindirana ne transmitted polarization. Mu calibrated reciprocal monostatic system, mhinduro dzeHV neVH dzinowanzo fanana, asi nzira dzese dzinochengetwa muchiyero chakazara chepolarimetric.
Maitiro Matatu Makuru eSAR Polarization
1. Kupatsanurana kamwe chete
Kuwana data rimwe chete (single-polarization acquisition) kunoburitsa chiteshi chimwe chete, kazhinji kacho HH kana VV. Kunopa dhata shoma uye kugadzirisa zviri nyore kana chiteshi chimwe chete chakasimbiswa chakakwana. Muganho ndewekuti chiteshi chimwe chete chinopa ruzivo rushoma nezve nzira dzekupararira uye chimiro chechinangwa.
2. Kupatsanurana kaviri
Kuwana data re dual-polarization kunonyora nzira mbiri. Kusanganiswa kwakajairika kunosanganisira HH+HV neVV+VH, uko radar inotumira polarization imwe uye inogamuchira zvese co- uye cross-polarized returns. Mamwe masisitimu anotsigirawo co-pol pair yakaita seHH+VV. Dual-pol data inowedzera kusarura kunobatsira uku ichichengetedza data-rate uye processing requirements zviri nyore kudzora kupfuura full polarimetry. ESA inoti Sentinel-1 inotsigira VV+VH kana HH+HV mu dual-polarization schemes.
3. Kupatsanura Kwakazara kana Kwakakora
SAR yakazara yepolarimetric inorekodha HH, HV, VH uye VV senzira dzakaoma kunzwisisa. Radar yekare yequad-pol inotumira H naV muzvikamu uye inogamuchira zvese H naV zvinodzoka, ichichengetedza amplitude uye relative phase information. Izvi zvinotsigira scattering-matrix analysis uye decomposition yakadzama yechinangwa, classification uye characterization.
Kuchinjana kwacho kunosanganisira kuomarara kwesystem, kudiwa kwecalibration, huwandu hwedata uye kushanda nesimba. Zvichienderana nesensor, kushanda kwefull-pol kunogonawo kusanganisira swath yakamanikana kana zvimwe zvipingamupinyi zvekuwana. Compact polarization imwe nzira inoshanda yeSAR, asi yakasiyana nemaitiro ekare e single-, dual- uye quad-pol linear akurukurwa pano.
Kubatana kwePolarization vs. Cross-Polarization
Nzira dzakasanganiswa (co-polarized channels) dzinowanzo chengetedza kudzoka kwakasimba kubva pamusoro uye zvivakwa zvinochengetedza polarization inotumirwa. Kudzoka kwakasanganiswa kunoratidza kuti maitiro ekupararira akachinja chikamu chemamiriro epolarization kuburikidza nekupararira kwehuwandu, kuratidzwa kwakawanda, geometry yakaoma kana chimiro cheanisotropic.
- Mvura yakadzikama nenzvimbo dzakatsetseka:kazhinji zvinoita serima kana simba rakawanda richiratidzwa kure neradar; kuomarara, mhepo uye kona yezviitiko zvinogona kuwedzera kudzoka shure.
- Muriwo:Matavi, hunde nemashizha zvinoparadzira huwandu hwevhu, saka nzira dzakasiyana-siyana dzinogona kuwedzera ruzivo rwakakosha rwemaumbirwo aro.
- Nzvimbo dzemumaguta:Zvivakwa nenzvimbo dzepasi zvinogona kugadzira kudzoka kwakasimba kwe co-pol uye kupararira kwe double-bounce, zvichienderana nekwakatarisana uye geometry yemifananidzo.
- Ivhu, sinou nechando:hunyoro, kuomarara, kudzika, urefu hwemafungu uye chimiro chemukati zvese zvinokanganisa mhinduro ye polarization.
Idzi ipfungwa dzekududzira kwete mitemo yepasi rose. Nzira haifanirwe kusarudzwa yakazvimiririra zvichienderana nebhendi reradar, kona yezviitiko, resolution, mwaka uye mhando yekuenzanisa.
Maitiro Ekusarudza SAR Polarization Mode
| Chinodiwa | Nzvimbo yekutanga inoshanda |
|---|---|
| Kutarisa nzvimbo yakakura kana huwandu hushoma hwedata | Imwe-pol kana chiteshi chakasimbiswa chikasangana nechinangwa chekuona |
| Kusarura kurimwa, kurima kana kusarura vanhu vane ivhu | Ruzivo rwakasanganiswa rwemapol maviri pamwe chete uye ruzivo rwakapatsanurwa rwekuwedzera ruzivo rwekuparadzira |
| Mepu yechando chegungwa, gungwa kana mafashamo | Sarudza nzira dzeHH- kana VV zvichienderana nebhendi, kona yezviitiko uye nzira yakasimbiswa |
| Kupatsanura kwepamusoro kana kuparara kwekupararira | Full quad-pol kana ruzivo rwemachannel mana rwakagadzirwa nechikamu ruchidikanwa |
Nzira yakanakisisa ndeyekushandisa zvakanangana nepurogiramu. Mainjiniya vanofanira kuenzanisa zviri mukati meruzivo nekuvhara, kugadzirisa, chiyero chesignali-ku-ruzha, swath, nguva yekudzokorora, zviwanikwa zvekugadzirisa uye kugona kugadzirisa.
Kufunga nezveAntenna uye RF yePolarimetric Radar
Kuyerwa kwepolarimetric kwakavimbika kunoenderana nezvinopfuura algorithm yekugadzirisa. Antena neRF chain zvinofanirwa kuchengetedza kushanda kwakasimba mumatanho ese ari maviri epolarization. Zvikamu zvakakosha zvinosanganisira:
- frequency yekushanda uye bandwidth yekukurumidza;
- kuenzana kwekuwedzera uye mwaranzi pakati pemachiteshi eH neV;
- kuparadzaniswa kwevanhu vanoenda kune dzimwe nzvimbo uye kusarurana kwevanhu vanoenda kune dzimwe nzvimbo;
- amplitude uye kugadzikana kwechikamu;
- VSWR, chinobatanidza chinongedzo uye kuyera tambo;
- kurongeka kweantenna, kuisa geometry uye calibration reference plane.
RF MISO zvinhuantenna dzenyanga dzine polarized mbiri, antenna dze broadband dzine nyanga mbiri dzakapatsanurwauye dzimwe mhinduro dzeRF antenna dzebasa re radar, kuyera uye kubatanidza masisitimu. Kusarudzwa kwemuenzaniso kunofanirwa kugara kwakavakirwa padatasheet iripo uye zvinodiwa zvakakwana zvebvunzo.
Mibvunzo Inowanzo bvunzwa
Ndeipi tsamba inotanga kutaurwa muSAR polarization code?
Bhii rekutanga rinozivisa polarization inotumirwa uye rechipiri rinozivisa polarization inogashirwa. HV zvinoreva transmit yakatwasuka uye vertical receive.
Ndeupi musiyano uripo pakati pe dual-pol ne quad-pol SAR?
Dual-pol inorekodha nzira mbiri, dzinowanzova HH+HV kana VV+VH. Quad-pol inorekodha HH, HV, VH uye VV uye inochengetedza hukama hunodiwa kuti pave nekuongorora kwakazara kwepolarimetric.
Kugona kushandisa SAR polarization imwe chete kwakanaka nguva dzose here?
Kwete. Nzira inonyanya kubatsira inoenderana nechinangwa, radar wavelength, incidence angle, resolution, nharaunda uye chinangwa chekugadzirisa.
Sei nzira dzekutaurirana dzichibatsira?
HV kana VH zvinogona kuratidza kupararira kunochinja polarization yezviitiko, kunyanya kupararira kwehuwandu uye zvinangwa zvakaoma zvakaita sezvirimwa.
Mhedziso
SAR polarization inodzora kuti radar inovheneka sei chinangwa uye kuti munda wakadzoserwa unoyerwa sei. HH neVV inzira dzakasanganiswa, nepo HV neVH zvichipatsanurwa. Single-pol inopa kushanda zvakanaka, dual-pol inowedzera kusarura, uye full quad-pol inopa data rakakwana re polarimetric linear. Mhedzisiro chaiyo inoda kuti nzira yekuwana, antenna system, calibration method uye application requirements zvifungisiswe pamwe chete.
Kuti muwane sarudzo yeantenna kana rutsigiro rwekuyerwa kweRF yepolarimetric, tarisai RF MISO'skugona kwekuyedza antenna or taura nechikwata cheRF MISO.
Mareferensi uye Kuverenga Kwakawedzerwa
Kuti udzidze zvakawanda nezve antenna, ndapota shanyira:
Nguva yekutumira: Chikumi-28-2024
