ʻO ka Oven-Controlled Crystal Oscillator (OCXO) he ʻano oscillator aniani e hiki ai i ka ultra-paʻa alapine kiʻekiʻe ma o ka ʻenehana hoʻomalu mahana-mau. ʻO kāna kumu nui e pili ana i ka hoʻopaʻa ʻana i ke aniani i loko o kahi keʻena umu i hoʻoponopono ʻia me ka wela, kahi e mālama ai nā kaʻa kaʻa wela a me ka mālama ʻana i ka mahana hana mau no ka aniani. Hoʻemi nui kēia i ka hopena o nā ʻano like ʻole o ka mahana ma ke alapine.
Nā Pōmaikaʻi Nui o nā OCXO ma ka Honua-Nā Loaʻa Satellite:
1. Paʻa alapine kiʻekiʻe:
Manaʻo ʻŌlelo: Hoʻohana maʻamau nā hōʻailona Satellite (e laʻa, kamaʻilio, nā satelite hoʻokele) i nā mea lawe alapine kiʻekiʻe (e laʻa, L-band, C-band). Pono ka poʻe loaʻa i ka hoʻololi ʻana a me ka demodulation pili e unuhi i ka ʻikepili, e koi ana i ka paʻa alapine kiʻekiʻe loa mai ka oscillator kūloko.
Pono OCXO: Mālama nā OCXO i ka mahana aniani i loko o ± 0.1 degere ma o ke keʻena umu. Mai ka ±1×10⁻⁹ a hiki i ka ±1×10⁻¹¹ (hoʻoheheʻe ʻia i kēlā me kēia lā), ʻoi aku ka maikaʻi ma mua o nā oscillator kristal maʻamau (XOs) a i ʻole ka wela -oscillators crystal compensated (TCXOs). Hoʻemi nui kēia kūpaʻa i ka Bit Error Rate (BER) i ka wā demodulation hōʻailona.
2. Haʻahaʻa Phase walaau:
Ka Papa Hana Hana: Hoʻohana pinepine nā hōʻailona Satellite i nā ʻōnaehana hoʻololi ʻikepili kiʻekiʻe (e laʻa, QPSK, 16APSK). ʻO ka walaʻau nui ʻana e hoʻopuehu ana i ke kiʻi constellation, e hoʻonui ana i ka BER.
Hana OCXO: Hōʻike maʻamau nā OCXO i ka walaʻau ma lalo o -150 dBc/Hz ma 1 kHz offset. Mālama kēia i ka maʻemaʻe spectral o ka hōʻailona oscillator kūloko, hoʻonui i ka pololei demodulation.
3. Ke kū'ē i ka ho'ololi 'ana i ka wela:
Luʻi Kaiapuni: Hiki ke ʻike ʻia nā mea hoʻokipa honua i nā ʻokoʻa wela loa (e laʻa, -40 degere a +70 degere), e hoʻoneʻe pinepine ai i nā oscillator maʻamau ma muli o nā hopena wela.
Mechanism Oven: Mālama ka mea hoʻomehana kūloko i ke aniani i kahi mahana mau (e laʻa, +75 degere ). ʻOiai i ka wā o ka hoʻololi ʻana i ka wela o waho, ua hoʻopau ʻia ka neʻe ʻana o ka alapine i nā ʻāpana o ka piliona (ppb) pae, e hōʻoia ana i ka hilinaʻi o nā mea hoʻokipa a pau.
4. Uku Hoʻololi Doppler:
Nā Satellite Dynamics: Low Earth Orbit (LEO) satellite (e laʻa, Starlink, GPS) e hoʻoulu i nā hoʻololi alapine Doppler (maʻamau ± 10 kHz a i ±100 kHz) ma muli o ka -wikiwiki kiʻekiʻe. Pono nā mea hoʻokipa e hahai i kēia mau loli alapine i ka -manawa maoli.
Kākoʻo OCXO: Hāʻawi ka uaki kuhikuhi paʻa loa mai ka OCXO i ka papa kuhikuhi no ka Phase -Locked Loop (PLL), e hōʻoia ana e hiki i ka oscillator kūloko ke hahai i nā offset alapine me ka wikiwiki a me ka pololei, e pale ana i ka nalowale o ka hōʻailona.
5. Uku -Loa'a Kahiko:
Kūpaʻa -Loaʻa: Loaʻa i nā OCXO ka helu makahiki o ka makahiki o <±0.1 ppm, hoʻohālikelike ʻia me ±2 ppm/makahiki a ʻoi aku paha no nā oscillator maʻamau. He mea koʻikoʻi kēia no nā kahua hoʻokele honua e koi ana i ka hana hoʻomau -makahiki lōʻihi (e laʻa, ke kamaʻilio lewa -hohonu), e hōʻemi ana i ka calibration a me ka mālama pinepine ʻana.
6. Nā pae alapine maʻamau:
ʻO nā OCXO i hoʻohana mau ʻia i nā mea hoʻokipa ukali e hana nui i loko o nā pae alapine:
10 MHz: Hoʻohana ma ke ʻano he alapine kuhikuhi kumu, hoʻohana nui ʻia no ka hana ʻana i nā hōʻailona oscillator kūloko kiʻekiʻe (ma o ka hoʻonui ʻana i ka PLL) a i ʻole ma ke ʻano he uaki kaʻina hana baseband.
100 MHz: He kūpono no ka -wikiwiki kiʻekiʻe ka hana ʻana i nā hōʻailona kikohoʻe (e laʻa, ADC/DAC sampling clock) a i ʻole ka hoʻokele pololei ʻana i ka RF mua-hopena.
ʻO nā alapine kikoʻī ʻē aʻe: E like me 10.230 MHz, 20 MHz, 25 MHz, 50 MHz, a me nā mea ʻē aʻe, i hana ʻia e like me nā koi ʻōnaehana.
Ke kumu no ke koho pinepine ʻana:
(1) ʻO ka pūna hōʻailona Satellite & Down{1}}Koi hoohuli:
Hoʻololi nā mea hoʻopaʻa uila i lalo-i nā hōʻailona alapine kiʻekiʻe (e laʻa, L, C, Ku-band) i ke alapine (IF). Hoʻohana pinepine ʻia nā OCXO i kēia mau hiʻohiʻona:
Kumu Hōʻikeʻike Oscillator Local (LO):
Laʻana: No ka loaʻa ʻana o nā hōʻailona L-band (1-2 GHz), hiki i kahi 10 MHz OCXO ke lawelawe ma ke ʻano he kuhikuhi PLL, i hoʻonui ʻia e hana i ka LO alapine kiʻekiʻe (e laʻa, 1 GHz).
Laʻana: C-band (4-8 GHz) hiki ke hoʻohana i ka 100 MHz OCXO, me ka PLL e synthesize i ka hōʻailona LO alapinepine kiʻekiʻe.
Hoʻoponopono pololei IF:
Ka Laʻana: Inā he 70 MHz a i ʻole 140 MHz ka IF, hiki i ka OCXO ke hāʻawi pololei i ke alapine o ka uaki e hoʻokele i nā ADC/DAC a i ʻole nā ʻāpana demodulator.
(2) Hoʻolālā Pūnaewele a me nā kikoʻī maʻamau:
Nā Mea Loaʻa GNSS (GPS/BeiDou):
Ka Laʻana: Pono nā kīpē Baseband i nā alapine kuhikuhi e like me 16.368 MHz (GPS L1) a i ʻole 10.23 MHz (uaki GPS mua), me nā PLL kūloko e hoʻopuka i nā alapine e pono ai.
Laʻana: Hiki i nā mea hoʻokipa kiʻekiʻe (e laʻa, RTK) ke hoʻohana pololei i ka 10 MHz OCXO ma ke ʻano he kuhikuhi waho e hoʻonui ai i ka paʻa o ka uaki.
TV Satellite (DVB-S2/S2X):
Laʻana: ʻO ke alapine o ka Local Oscillator (LO) ma ka LNB (Low{0}}Noise Block downconverter) he 9.75 GHz a i ʻole 10.6 GHz (Ku{3}}band), akā loaʻa pinepine ʻia kona uaki kuhikuhi mai kahi 10 MHz OCXO e hoʻokele ana i kahi PLL.
Nā Waena Kūkākūkā Honua (VSAT):
Laʻana: Ma muli o ka ITU -T G.813 maʻamau hoʻonohonoho hoʻonohonoho, hoʻohana pinepine ka uaki master i ka 10 MHz a i ʻole 20 MHz (E1 interface clock) OCXO.
(3) Nā Koina Hoʻoponopono Hōʻailona Kikohoʻe:
ADC/DAC Sampling Clock:
Laʻana: Inā hoʻohana ka mea hoʻokipa i kahi 100 MSPS (Mega Samples Per Second) ADC, pono paha kahi 100 MHz OCXO e hāʻawi pololei i ka uaki laʻana, e hōʻemi ana i ka jitter.
FPGA/ASIC Baseband Processing:
Ka Laʻana: Pono paha ka ʻikepili ʻikepili like ʻole o nā chipband baseband i nā uaki synchronous ma 25 MHz, 50 MHz, a i ʻole 125 MHz.
Nā laʻana hoʻohana maʻamau:
(1) Loaʻa GPS:
OCXO Frequency: 10 MHz (Nānā Kūwaho)
Hana: Hoʻopuka i ka hōʻailona oscillator kūloko 1575.42 MHz (L1 band) ma o PLL a hāʻawi i ka manawa kūpono i ka baseband.
(2) LEO Satellite Communication Terminal (e laʻa, Starlink):
OCXO Ka pinepine: 100 MHz
Hana: Hoʻokuʻu i nā ADC -wikiwiki kiʻekiʻe (e laʻa, 1 GSPS) a me -kalā nui PLL, hiki ke loaʻa a me ka hahai ʻana i nā hōʻailona Ku-band (12-18 GHz).
Hāʻawi ʻo Hangjing i ka hāʻawi wikiwiki ʻana (1 ~ 2 wiki) o nā huahana maʻamau i nā ʻāpana like ʻole, me nā OCXO i hana ʻia e hoʻokō i nā koi o ka mea kūʻai aku.
E kelepona iā Hangjing Sales a i ʻole ʻenehana ʻenehana no nā kikoʻī!
Hōʻuluʻulu manaʻo:
Ma muli o ke kūpaʻa alapine ʻokoʻa a me ka walaʻau haʻahaʻa, ʻo Oven-Controlled Crystal Oscillators ke kumu kumu wati no nā mea hoʻokipa ukali ma ka honua. Ua kūpono loa ia no ke koi ʻana i nā kaiapuni ʻo -kiʻekiʻe, haʻahaʻa haʻahaʻa-a-Noise Ratio (SNR). ʻOiai ka palena o ka hoʻohana ʻana i ka mana a me ka nui, ʻo OCXO ka mea nui i koho ʻia i nā kahua koʻikoʻi e like me ka hoʻokele, kamaʻilio, a me ka ʻike mamao.