CN204334597U - A kind of ultralow phase noise a reference source long distance transmitter - Google Patents
A kind of ultralow phase noise a reference source long distance transmitter Download PDFInfo
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- CN204334597U CN204334597U CN201420767619.0U CN201420767619U CN204334597U CN 204334597 U CN204334597 U CN 204334597U CN 201420767619 U CN201420767619 U CN 201420767619U CN 204334597 U CN204334597 U CN 204334597U
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Abstract
The utility model relates to a kind of ultralow phase noise a reference source long distance transmitter, comprise the main website for generation of a reference source, main website is connected with substation by fiber transmission device, establishes for carrying out narrow-band filtering and phase locked crystal oscillator phase-locked loop to a reference source in substation.The utility model is using main website a reference source as reference benchmark, RF-MW Photonics is adopted to realize long-distance transmissions, by VCXO, Phase Tracking is carried out to the reference data transmitted through RF-MW Photonics again and realize Phase synchronization, by narrow band phase lock loop, narrow-band filtering is carried out to photoelectricity transmission additional noise simultaneously, thus realize the Phase synchronization of a reference source between distributed radar main website and substation and the low noise of a reference source, simultaneously owing to have employed photoelectric technology and Phase Lock Technique, antijamming capability is extremely strong, relative inexpensiveness, be typically applied in the Phase synchronization of a reference source and the low noise of a reference source between distributed radar master-substation to transmit, there is very strong social effect and market value.
Description
Technical field
The utility model relates to RF-MW Photonics and crystal oscillator Phase Lock Technique field, especially a kind of ultralow phase noise a reference source long distance transmitter.
Background technology
Between the different substations of distributed, multistatic radar, distance reaches several kilometers, even tens kilometers, traditional thousands of dB of microwave cable loss, loss is very big, almost cannot realize remote, low phase noise transmission, and high-performance distributed radar there is high requirement to Phase synchronization and phase noise, requires with low cost simultaneously, antijamming capability is strong, and this is one of key issue perplexing distributed radar at present.
At present, the method realizing signal remote synchronous between different substation mainly contains three kinds: first method adopts radio frequency cable to transmit, and its shortcoming is that loss is large, weight is high, cost is high, and when particularly transmission range is far away, its shortcoming is especially outstanding; Second method adopts microwave signal space propagation, and its shortcoming is that transmission space is open, is easily disturbed, high to equipment installation requirement; The third method adopts GPS pps pulse per second signal to carry out synchronously, its shortcoming be high to environment for use requirement, signal is easily disturbed, equipment more complicated, cost are higher.
Utility model content
The purpose of this utility model is to provide the ultralow phase noise a reference source long distance transmitter that a kind of antijamming capability is extremely strong, cost is low.
For achieving the above object, the utility model have employed following technical scheme: a kind of ultralow phase noise a reference source long distance transmitter, comprise the main website for generation of a reference source, main website is connected with substation by fiber transmission device, establishes for carrying out narrow-band filtering and phase locked crystal oscillator phase-locked loop to a reference source in substation.
Described main website is made up of main website a reference source and electrooptic modulator, and the output of main website a reference source is connected with the input of electrooptic modulator, and the output of electrooptic modulator is connected with the input of fiber transmission device.
Described fiber transmission device is made up of the first optical fiber, photoamplifier and the second optical fiber, and the input of described photoamplifier connects the output of main website by the first optical fiber, and the output of described photoamplifier connects the input of substation by the second optical fiber.
Described substation is by photoelectricity demodulator, crystal oscillator phase-locked loop and crystal filter composition, described crystal oscillator phase-locked loop forms by the narrow band phase lock loop for carrying out narrow-band filtering to a reference source with for carrying out phase locked VCXO to a reference source, the described input of photoelectricity demodulator is connected with the output of fiber transmission device, the output of photoelectricity demodulator is connected with the input of crystal filter, the output of crystal filter is connected with the input of narrow band phase lock loop, the output of narrow band phase lock loop is connected with the input of VCXO, first output of VCXO is as the output of ultralow phase noise a reference source long distance transmitter.
Described narrow band phase lock loop is made up of phase discriminator, passive low noise loop filter and regenerative frequency divider, the input of phase discriminator is connected with the output of crystal filter, the output of phase discriminator is connected with the input of passive low noise loop filter, the passive output of low noise loop filter is connected with the input of VCXO, and the second output of VCXO exports pll feedback signal to phase discriminator by regenerative frequency divider.
As shown from the above technical solution, the utility model is using main website a reference source as reference benchmark, RF-MW Photonics is adopted to realize long-distance transmissions, by VCXO, Phase Tracking is carried out to the reference data transmitted through RF-MW Photonics again and realize Phase synchronization, by narrow band phase lock loop, narrow-band filtering is carried out to photoelectricity transmission additional noise simultaneously, thus realize the Phase synchronization of a reference source between distributed radar main website and substation and the low noise of a reference source, simultaneously owing to have employed photoelectric technology and Phase Lock Technique, antijamming capability is extremely strong, relative inexpensiveness, be typically applied in the Phase synchronization of a reference source and the low noise of a reference source between distributed radar master-substation to transmit, there is very strong social effect and market value.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present utility model.
Fig. 2 is narrow band phase lock loop and VCXO circuit block diagram in Fig. 1.
Fig. 3 is that main website a reference source exports, i.e. the phase noise curve synoptic diagram of a point.
Fig. 4 is that crystal filter exports, i.e. the phase noise curve synoptic diagram of b point.
Fig. 5 is that the VCXO of substation exports, i.e. the phase noise curve synoptic diagram of c point.
Embodiment
A kind of ultralow phase noise a reference source long distance transmitter, comprise the main website 10 for generation of a reference source, main website 10 is connected with substation 30 by fiber transmission device 20, establishes for carrying out narrow-band filtering and phase locked crystal oscillator phase-locked loop to a reference source, as shown in Figure 1 in substation 30.
As shown in Figure 1, described main website 10 is made up of main website a reference source 11 and electrooptic modulator 12, the output of main website a reference source 11 is connected with the input of electrooptic modulator 12, the output of electrooptic modulator 12 is connected with the input of fiber transmission device 20, main website a reference source 11 is used for producing base reference signal, and electrooptic modulator 12 converts electrical signals to light signal.
As shown in Figure 1, described fiber transmission device 20 is made up of the first optical fiber 21, photoamplifier 22 and the second optical fiber 23, the input of described photoamplifier 22 connects the output of main website 10 by the first optical fiber 21, the output of described photoamplifier 22 connects the input of substation 30 by the second optical fiber 23, first optical fiber 21 and the second optical fiber 23 are as the transmission medium of light signal, and photoamplifier 22 pairs of light signals amplify.
As shown in Figure 1, described substation 30 is by photoelectricity demodulator 31, crystal oscillator phase-locked loop and crystal filter 34 form, described crystal oscillator phase-locked loop forms by the narrow band phase lock loop 32 for carrying out narrow-band filtering to a reference source with for carrying out phase locked VCXO 33 to a reference source, the input of described photoelectricity demodulator 31 is connected with the output of fiber transmission device 20, the output of photoelectricity demodulator 31 is connected with the input of crystal filter 34, the output of crystal filter 34 is connected with the input of narrow band phase lock loop 32, the output of narrow band phase lock loop 32 is connected with the input of VCXO 33, first output of VCXO 33 is as the output of ultralow phase noise a reference source long distance transmitter, namely the output of VCXO is the Low phase noise a reference source of substation 30.Light signal is converted to the signal of telecommunication by photoelectricity demodulator 31, and narrow band phase lock loop 32 pairs of signals carry out narrow-band filtering, and VCXO 33 exports the reference signal synchronously, and crystal filter 34 pairs of signals carry out arrowband pre-filtering.
As shown in Figure 2, described narrow band phase lock loop 32 is made up of phase discriminator 321, passive low noise loop filter 322 and regenerative frequency divider 323, the input of phase discriminator 321 is connected with the output of crystal filter 34, the output of phase discriminator 321 is connected with the input of passive low noise loop filter 322, the output of passive low noise loop filter 322 is connected with the input of VCXO 33, and the second output of VCXO 33 exports pll feedback signal to phase discriminator 321 by regenerative frequency divider 323.The reference signal that photoelectricity demodulator 31 exports and the feedback signal that VCXO 33 exports produce phase demodulation voltage after phase discriminator 321, as the tuning voltage of VCXO 33 after narrow band loop filtering, VCXO 33 output work divides two-way, one tunnel is as pll feedback signal, and an other road exports as the reference signal after synchronously.
As shown in Fig. 3,4,5, a point power is 5 ± 3dBm, b point power be 0 ± 3dBm, c point power is 10 ± 3dBm; A point luminous power is 5 ± 3dBm, B point luminous power is 5 ± 3dBm, and the gain of photoamplifier 22 adjusts according to the fibre loss of actual range, and optical fiber every kilometer loss is about 0.2dB, and loop bandwidth is 40Hz ~ 120Hz.
The phase noise of substation 30 can realize index :≤-130dBc/Hz@100Hz ,≤-155dBc/Hz@1kHz ,≤-170dBc/Hz@1MHz.
In sum, the utility model is using main website a reference source 11 as reference benchmark, RF-MW Photonics is adopted to realize long-distance transmissions, by VCXO 33, Phase Tracking is carried out to the reference data transmitted through RF-MW Photonics again and realize Phase synchronization, carry out narrow-band filtering by narrow band phase lock loop 32 pairs of photoelectricity transmission additional noises simultaneously, thus realize the Phase synchronization of a reference source between distributed radar main website 10 and substation 30 and the low noise of a reference source, simultaneously owing to have employed photoelectric technology and Phase Lock Technique, antijamming capability is extremely strong, relative inexpensiveness, be typically applied in the Phase synchronization of a reference source and the low noise of a reference source between distributed radar master-substation to transmit, there is very strong social effect and market value.
Claims (5)
1. a ultralow phase noise a reference source long distance transmitter, it is characterized in that: comprise the main website (10) for generation of a reference source, main website (10) is connected with substation (30) by fiber transmission device (20), establishes for carrying out narrow-band filtering and phase locked crystal oscillator phase-locked loop to a reference source in substation (30).
2. ultralow phase noise a reference source long distance transmitter according to claim 1, it is characterized in that: described main website (10) is made up of main website a reference source (11) and electrooptic modulator (12), the output of main website a reference source (11) is connected with the input of electrooptic modulator (12), and the output of electrooptic modulator (12) is connected with the input of fiber transmission device (20).
3. ultralow phase noise a reference source long distance transmitter according to claim 1, it is characterized in that: described fiber transmission device (20) is made up of the first optical fiber (21), photoamplifier (22) and the second optical fiber (23), the input of described photoamplifier (22) connects the output of main website (10) by the first optical fiber (21), the output of described photoamplifier (22) connects the input of substation (30) by the second optical fiber (23).
4. ultralow phase noise a reference source long distance transmitter according to claim 1, it is characterized in that: described substation (30) are by photoelectricity demodulator (31), crystal oscillator phase-locked loop and crystal filter (34) composition, described crystal oscillator phase-locked loop forms by the narrow band phase lock loop (32) for carrying out narrow-band filtering to a reference source with for carrying out phase locked VCXO (33) to a reference source, the input of described photoelectricity demodulator (31) is connected with the output of fiber transmission device (20), the output of photoelectricity demodulator (31) is connected with the input of crystal filter (34), the output of crystal filter (34) is connected with the input of narrow band phase lock loop (32), the output of narrow band phase lock loop (32) is connected with the input of VCXO (33), first output of VCXO (33) is as the output of ultralow phase noise a reference source long distance transmitter.
5. ultralow phase noise a reference source long distance transmitter according to claim 4, it is characterized in that: described narrow band phase lock loop (32) is by phase discriminator (321), passive low noise loop filter (322) and regenerative frequency divider (323) composition, the input of phase discriminator (321) is connected with the output of crystal filter (34), the output of phase discriminator (321) is connected with the input of passive low noise loop filter (322), the output of passive low noise loop filter (322) is connected with the input of VCXO (33), second output of VCXO (33) exports pll feedback signal to phase discriminator (321) by regenerative frequency divider (323).
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| CN201420767619.0U CN204334597U (en) | 2014-12-09 | 2014-12-09 | A kind of ultralow phase noise a reference source long distance transmitter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506299A (en) * | 2014-12-09 | 2015-04-08 | 中国电子科技集团公司第三十八研究所 | Ultralow-phase noise standard source remote transmission device |
| CN106921106A (en) * | 2017-04-26 | 2017-07-04 | 中国电子科技集团公司第三十八研究所 | A kind of small-sized Ultra-Low Phase Noise Optical-Electronic Oscillator and its optical microcavity preparation method |
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2014
- 2014-12-09 CN CN201420767619.0U patent/CN204334597U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506299A (en) * | 2014-12-09 | 2015-04-08 | 中国电子科技集团公司第三十八研究所 | Ultralow-phase noise standard source remote transmission device |
| CN106921106A (en) * | 2017-04-26 | 2017-07-04 | 中国电子科技集团公司第三十八研究所 | A kind of small-sized Ultra-Low Phase Noise Optical-Electronic Oscillator and its optical microcavity preparation method |
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