Ukusebenza kwe-eriyali yeGPS

Ukusebenza kwe-eriyali yeGPS

Siyazi ukuba i-GPS locator yi-terminal yokubeka okanye ukukhangela ngokufumana imiqondiso yesathelayithi.Kwinkqubo yokufumana imiqondiso, kufuneka kusetyenziswe i-eriyali, ngoko ke sibiza i-eriyali efumana isignali nge-eriyali ye-GPS.Iimpawu zesathelayithi zeGPS zohlulwe zibe yi-L1 kunye ne-L2, kunye nee-frequencies ze-1575.42MHZ kunye ne-1228MHZ ngokulandelelanayo, phakathi kwayo i-L1 isignali yoluntu evulekileyo kunye ne-polarization yesetyhula.Amandla omqondiso malunga ne-166-DBM, eyimpawu ebuthathaka.Ezi mpawu zimisela ukuba ii-eriyali ezikhethekileyo kufuneka zilungiselelwe ulwamkelo lweempawu zeGPS.

1. Iphepha leCeramic: Umgangatho we-ceramic powder kunye nenkqubo ye-sintering ichaphazela ngokuthe ngqo ukusebenza kwayo.Amaphepha e-ceramic asetyenziswa ngoku kwimarike ubukhulu becala 25×25, 18×18, 15×15 kunye ne-12×12.Inkulu indawo yephepha le-ceramic, kokukhona i-dielectric rhoqo, iphezulu i-resonance frequency, kwaye ngcono isiphumo sokwamkelwa.Uninzi lweziqwenga ze-ceramic ziyi-square design, ukwenzela ukuba kuqinisekiswe ukuba i-resonance kwindlela ye-XY ifana ngokusisiseko, ukuze kuphunyezwe umphumo wengqokelela yeenkwenkwezi ezifanayo.

2. Umaleko wesilivere: Umaleko wesilivere kumphezulu we-eriyali ye-ceramic unokuchaphazela i-resonant frequency ye-eriyali.Indawo efanelekileyo ye-GPS ye-ceramic chip iwela ngokuthe ngqo kwi-1575.42MHz, kodwa indawo yokuphindaphinda ye-antenna ichatshazelwa lula yimeko engqongileyo, ngakumbi xa idityaniswe kumatshini wonke, indawo yokuphindaphinda kufuneka ihlengahlengiswe ukuze igcinwe. 1575.42MHz ngokuhlengahlengisa imilo yokwaleka komhlaba wesilivere..Ke ngoko, abavelisi bomatshini abagqibeleleyo be-GPS kufuneka basebenzisane nabavelisi be-eriyali xa kuthengwa ii-eriyali kwaye babonelele ngeesampulu zoomatshini ezipheleleyo zovavanyo.

3. Indawo yokutya: I-eriyali ye-ceramic iqokelela umqondiso we-resonance kwindawo yokutya kwaye iyithumele ekupheleni.Ngenxa yokudibana kwe-eriyali, indawo yokutya ayikho embindini we-eriyali, kodwa ihlengahlengiswe kancinane kwicala le-XY.Indlela enjalo yokulinganisa i-impedance ilula kwaye ayongezi iindleko.Ukuhamba kuphela kwi-axis enye kubizwa ngokuba yi-eriyali ecalanye, kwaye ukuhamba kuzo zombini ii-asi kubizwa ngokuba yi-double-bias.

4. Ukwandisa isekethe: imilo kunye nommandla wePCB ephethe i-eriyali yeceramic.Ngenxa yeempawu ze-GPS rebound, xa imvelaphi i-7cm × 7cm

I-antenna ye-GPS ineeparamitha ezine ezibalulekileyo: inzuzo (iGain), i-wave wave (VSWR), isibalo sengxolo (i-Noise figure), i-axial ratio (i-Axial ratio).Phakathi kwabo, umlinganiselo we-axial ugxininiswe ngokukodwa, oyisilathisi esibalulekileyo sokulinganisa umahluko wenzuzo yesignali yomatshini wonke kwiindlela ezahlukeneyo.Ekubeni ii-satellites zisasazwa ngokungenamkhethe kwi-hemispherical sky, kubaluleke kakhulu ukuqinisekisa ukuba ii-eriyali zinovakalelo olufanayo kuwo onke amacala.Umlinganiselo we-axial uchaphazeleka ekusebenzeni kwe-antenna, ubume bembonakalo, isiphaluka sangaphakathi kunye ne-EMI yomatshini wonke.