Wadanne abubuwa ne ke shafar aikin eriyar GPS?

Ingancin foda yumbura da tsarin sintiri kai tsaye yana shafar aikin eriyar gps. Faci yumbu a halin yanzu ana amfani dashi a kasuwa shine 25 × 25, 18 × 18, 15 × 15, da 12 × 12. Mafi girman yankin facin yumbu, mafi girman madaurin dielectric, mafi girman mitar resonant, kuma mafi kyawun tasirin liyafar eriya ta GPS.

Layer na azurfa a saman eriyar yumbu na iya rinjayar mitar eriya. Madaidaicin mitar guntu yumbura ta GPS daidai 1575.42MHz, amma mitar eriya tana da sauƙin shafar yanayin kewaye, musamman idan an haɗa ta a cikin injin gabaɗaya, dole ne a daidaita murfin saman azurfa. Ana iya daidaita mitar eriyar kewayawa ta GPS don kiyaye siffar eriyar kewayawa ta GPS a 1575.42MHz. Don haka, mai kera cikakken na'ura na GPS dole ne ya yi aiki tare da ƙera eriya yayin siyan eriya, kuma ya samar da cikakken samfurin injin don gwaji.

Wurin ciyarwa yana rinjayar aikin eriyar GPS
Eriyar yumbura tana tattara siginar ƙararrawa ta wurin ciyarwa kuma ta aika zuwa ƙarshen baya. Saboda yanayin madaidaicin impedance eriya, gabaɗayan wurin ciyarwa baya cikin tsakiyar eriya, amma an ɗan daidaita shi a cikin hanyar XY. Wannan hanyar dacewa da impedance abu ne mai sauƙi kuma baya ƙara Cost, motsi kawai a cikin axis ɗaya ana kiran eriya mai son zuciya ɗaya, kuma motsi a cikin gatura biyu ana kiransa eriya mai son zuciya biyu.

Ƙaddamar da kewayawa yana rinjayar aikin eriyar GPS
Siffa da yanki na PCB ɗauke da eriyar yumbu, saboda yanayin dawowar GPS, lokacin da bango ya kasance 7cm x 7cm ƙasa mara yankewa, aikin eriyar faci na iya ƙara girma. Ko da yake an iyakance shi ta bayyanar da tsari, yi ƙoƙarin kiyaye shi daidai Wurin da siffar amplifier ɗin iri ɗaya ne. Zaɓin ribar da'irar amplifier dole ne ya dace da ribar LNA ta baya. GSC 3F na Sirf yana buƙatar jimlar ribar kafin shigar da siginar kada ta wuce 29dB, in ba haka ba siginar eriyar kewayawa ta GPS za ta kasance mai cike da jin daɗi. Eriyar GPS tana da mahimman sigogi guda huɗu: Gain, Standing Wave (VSWR), Noise Figure, da Axial Ratio, daga cikinsu akwai ma'auni na Axial Ratio, wanda shine ma'auni na siginar siginar gaba ɗaya na injin a wurare daban-daban. muhimmiyar alamar bambanci. Tun da tauraron dan adam ana rarraba bazuwar a cikin sararin samaniya, yana da matukar muhimmanci a tabbatar da cewa eriya suna da irin wannan hankali a kowane bangare. Matsakaicin axial yana shafar aikin eriyar GPS, bayyanar da tsari, da'irar ciki na duka na'ura, da EMI.