Oven{0} Crystal Oscillator na-achịkwa (OCXO) bụ ụdị oscillator kristal na-enweta nkwụsi ike ultra{1} dị elu site na teknụzụ njikwa okpomọkụ mgbe niile. Ụkpụrụ ya bụ isi na-agụnye idobe kristal n'ime ụlọ ọkụ a na-achịkwa nke ọma, ebe ikpo ọkụ na njikwa okpomọkụ na-anọgide na-arụ ọrụ okpomọkụ maka kristal. Nke a na-ebelata mmetụta nke mgbanwe okpomọkụ na ugboro ole.
Uru ndị isi nke OCXO dị na ala-Ndị nnata Satellite dabere:
1. Nkwụsi ike dị elu:
Ọdịnihu chọrọ: mgbama satịlaịtị (dịka ọmụmaatụ, nkwukọrịta, satịlaịtị igodo) na-ejikarị ụgbọ elu{2}} (dịka ọmụmaatụ, L-band, C-band). Ndị nnata na-achọ ala- mgbanwe na ngbanwe dị n'otu iji wepụta data, na-achọ nkwụsi ike ugboro ugboro site na oscillator mpaghara.
Uru OCXO: OCXO na-edobe okpomoku kristal n'ime ogo ± 0.1 site na ụlọ oven. Nkwụsi ike ugboro ole sitere na ± 1 × 10⁻⁹ ruo ± 1 × 10⁻¹¹ (mfegharị kwa ụbọchị), dị elu karịa ọkọlọtọ oscillators kristal (XOs) ma ọ bụ okpomọkụ{6}} kristal oscillators akwụ ụgwọ (TCXOs). Nkwụsi ike a na-ebelata nke ukwuu ọnụego Error Rate (BER) n'oge mbelata mgbaàmà.
2. Mkpọtụ Agba dị ala:
Ngwa ndapụta: Mgbama satịlaịtị na-ejikarị atụmatụ mgbanwe ọnụego data dị elu (dịka, QPSK, 16APSK). Mkpọtụ oge gafere oke na-ebute eserese kpakpando na-agbaji, na-abawanye BER.
Ọrụ OCXO: OCXO na-egosipụtakarị mkpọtụ usoro n'okpuru -150 dBc/Hz na nkwụsị 1 kHz. Nke a na-achọpụta ịdị ọcha nke mgbama oscillator mpaghara, na-eme ka izi ezi nke demodulation pụta ìhè.
3. Nguzogide mgbanwe okpomọkụ:
Ihe ịma aka gburugburu ebe obibi: Enwere ike ikpughe ndị na-anata ala na oke okpomọkụ dị iche iche (dịka ọmụmaatụ, -40 degrees na +70 degrees ), na-eme ka ịfegharị ugboro ugboro na oscillators ọkọlọtọ n'ihi mmetụta ọkụ.
Usoro oven: Igwe ọkụ dị n'ime na-arụsi ọrụ ike na kristal na okpomọkụ na-adị mgbe niile (dịka ọmụmaatụ, +75 ogo). Ọbụlagodi n'oge mgbanwe okpomọkụ dị n'èzí siri ike, a na-egbochi ịfefe ugboro ugboro ruo akụkụ kwa ijeri (ppb), na-ahụ na ntụkwasị obi niile- ihu igwe.
4. Nkwụghachi ụgwọ Shift Doppler:
Satellite Dynamics: Low Earth Orbit (LEO) Satellites (dịka, Starlink, GPS) na-emepụta mgbanwe ugboro ugboro Doppler (nke ± 10 kHz ruo ± 100 kHz) n'ihi oke ọsọ -. Ndị nnata ga-esochi mgbanwe ndị a ugboro ugboro na ozugbo-oge.
Nkwado OCXO: Elekere ntụaka kwụsiri ike nke ukwuu sitere na OCXO na-enye ntọala maka usoro {{0}Locked Loop (PLL), na-ahụ na oscillator mpaghara nwere ike soro nkwụghachi ugboro ugboro ọsọ ọsọ na kpomkwem, na-egbochi mfu mgbaama.
5. Ogologo -Nkwụghachi ụgwọ ịka nká:
Ogologo oge {{0}Sike nkwụsi ike: OCXO na-enwekarị ọnụego ịka nká nke <±0.1ppm, atụnyere ±2 ppm/afọ ma ọ bụ karịa maka oscillators ọkọlọtọ. Nke a dị oke mkpa maka ọdụ ụgbọ elu satịlaịtị na-achọ ogologo oge{4}} na-aga n'ihu na-arụ ọrụ (dịka ọmụmaatụ, nkwurịta okwu miri emi-), na-ebelata nhazi na nhazi oge.
6. Oke ugboro ugboro:
OCXO nke a na-ejikarị na satịlaịtị nnata na-arụ ọrụ n'ụzọ bụ isi n'ime ọnụọgụ ugboro ndị a:
10 MHz: Na-arụ ọrụ dị ka oge ntụaka dị mkpa, nke a na-ejikarị eme ihe maka iwepụta akara oscillator mpaghara ugboro ugboro (site na ọtụtụ PLL) ma ọ bụ ozugbo dị ka elekere nhazi baseband.
100 MHz: Kwesịrị ekwesị maka nhazi akara ngosi dijitalụ ọsọ ọsọ{1} (dịka, ADC/DAC sampling clock) ma ọ bụ na-anya RF n'ihu- akwụsị.
Ugboro ndị ọzọ akọwapụtara: Dị ka 10.230 MHz, 20 MHz, 25 MHz, 50 MHz, wdg, ahaziri dị ka usoro chọrọ.
Ndabere maka ịhọrọ ugboro ugboro:
(1) Satellite Signal Band & Down{1}Ihe ngbanwe chọrọ:
Ndị na-anata satịlaịtị na-agbada-gbanwee akara ngosi dị elu{1} (dịka, L, C, Ku-band) ka ọ bụrụ nkeji etiti (IF). A na-ejikarị OCXO eme ihe n'ọnọdụ ndị a:
Isi mmalite ntụaka mpaghara Oscillator (LO):
Ọmụmaatụ: Maka ịnata akara L-band (1{3}}2 GHz), 10 MHz OCXO nwere ike ịrụ ọrụ dị ka ntụaka PLL, mụbaa iji wepụta LO (dịka, 1 GHz) dị elu.
Ọmụmaatụ: Ndị nnata C-band (4{3}}8 GHz) nwere ike iji 100 MHz OCXO, yana PLL na-emepụta mgbama LO dị elu.
Direct Ọ BỤRỤ Nhazi:
Ọmụmaatụ: Ọ bụrụ na IF bụ 70 MHz ma ọ bụ 140 MHz, OCXO nwere ike ịnye oge elekere ozugbo iji kwọọ ADCs/DAC ma ọ bụ ibe demodulator.
(2) Nhazi sistemu na nkọwapụta ọkọlọtọ:
Ndị nnata GNSS (GPS/BeiDou):
Ọmụmaatụ: Ihe mgbawa Baseband na-achọkarị oge ntụaka dị ka 16.368 MHz (GPS L1) ma ọ bụ 10.23 MHz (elekere GPS izizi), yana PLL dị n'ime na-ewepụta ugboro ole achọrọ.
Ọmụmaatụ: Elu{0}} ndị nnata nkenke (dịka ọmụmaatụ, RTK) nwere ike iji 10 MHz OCXO ozugbo dịka ntụaka mpụga iji kwalite nkwụsi ike elekere.
Satellite TV (DVB{0}}S2/S2X):
Ọmụmaatụ: Ugboro Oscillator (LO) na LNB (Low{0} Noise Block downconverter) na-abụkarị 9.75 GHz ma ọ bụ 10.6 GHz (Ku{3}band), mana elekere ntụaka ya na-enwetakarị site na 10 MHz OCXO na-anya PLL.
Ebe nkwurịta okwu Satellite Ụwa (VSAT):
Ọmụmaatụ: N'ịgbaso ụkpụrụ mmekọrịta ITU{0}}T G.813, elekere ukwu na-ejikarị 10 MHz ma ọ bụ 20 MHz (E1 interface clock) OCXO.
(3) Achọrọ nhazi akara ngosi dijitalụ:
ADC/DAC nlele elekere:
Ọmụmaatụ: Ọ bụrụ na onye nnata na-eji 100 MSPS (Mega Samples Per Second) ADC, a ga-achọ 100 MHz OCXO iji nye elekere nlele ozugbo, na-ebelata jitter.
Nhazi FPGA/ASIC Baseband:
Ọmụmaatụ: Ntụgharị data myirịta nke ibe baseband nwere ike ịchọ ka elekere mekọrịtara ọnụ na 25 MHz, 50 MHz, ma ọ bụ 125 MHz.
Ọmụmaatụ ngwa ngwa:
(1) GPS nnata:
Ugboro OCXO: 10 MHz (Ntụaka Mpụga)
Ọrụ: Na-emepụta 1575.42 MHz (L1 band) mgbama oscillator mpaghara site na PLL ma na-enye oge ziri ezi na baseband.
(2) Ebe nkwurịta okwu Satellite LEO (dịka, Starlink):
Ugboro OCXO: 100 MHz
Ọrụ: Na-anya ADC ọsọ ọsọ - (dịka, 1 GSPS) na ọtụtụ{4}}ọwa PLL, na-eme ka ị nweta ngwa ngwa na nsochi akara Ku-band (12-18 GHz).
Hangjing na-enye nnyefe ngwa ngwa (izu 1 ~ 2) nke ngwaahịa ọkọlọtọ na ngwugwu dị iche iche, yana OCXO ahaziri iji mezuo ihe ndị ahịa chọrọ.
Kpọtụrụ ndị ahịa Hangjing ma ọ bụ ndị injinia nka maka nkọwa!
Nchịkọta:
Site na nkwụsi ike ugboro ole na ụzụ dị ala, Oven{0} Crystal Oscillators na-achịkwa na-arụ ọrụ dị ka isi mmalite elekere maka ndị na-anata satịlaịtị dabere{1}. Ha dabara nke ọma maka ịchọ gburugburu {{3} ike dị ike, obere mgbaama - na -Mkpọtụ mkpọtụ (SNR) gburugburu. N'agbanyeghị oke ike na oriri na nha, OCXO ka bụ nhọrọ dị oke mkpa na mpaghara dị oke egwu dị ka igodo, nzikọrịta ozi na nhụta anya.