CN113890615A - Radar clock and local oscillator signal transmission system based on microwave photon technology - Google Patents
Radar clock and local oscillator signal transmission system based on microwave photon technology Download PDFInfo
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- 230000003287 optical effect Effects 0.000 claims abstract description 138
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 21
- 230000010355 oscillation Effects 0.000 abstract description 12
- 238000002955 isolation Methods 0.000 abstract description 5
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- 238000006243 chemical reaction Methods 0.000 description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Communication System (AREA)
Abstract
A radar clock and local oscillator signal transmission system based on microwave photon technology comprises a light emitting module for modulating radio frequency signals of corresponding categories into optical signals, and an optical splitter connected with the corresponding light emitting module and used for splitting the optical signals into multiple optical signals; the system also comprises an optical receiving module which demodulates the optical signals into radio frequency signals, the optical receiving module corresponds to the optical signals split by the optical splitter one by one, and the optical receiving module is connected with the optical splitter through optical fibers. Compared with the prior art, the invention has the advantages that: the invention realizes the long-distance multipath transmission of clock and local oscillation signals; high-isolation output between the clock and the local oscillation signal is realized; the high-amplitude consistent transmission of clock and local oscillation signals is realized by utilizing the optical power detection automatic gain control principle; high phase consistency transmission of clock and local oscillator signals is realized; the integrated and modularized design of the front-end equipment and the rear-end equipment realizes the transmission of small-size clocks and local oscillation signals.
Description
Technical Field
The invention relates to the technical field of signal transmission, in particular to a radar clock and local oscillator signal transmission system based on a microwave photon technology.
Background
In modern war, in order to improve the survivability of battlefield equipment and personnel, remote control and setting of a plurality of false targets and the like are one of the common means. For electronic equipment such as radars, many processing devices are often separated from the antenna in order to avoid significant losses due to radiation detection and attack by enemies. More critically, on airborne and space-based platforms, devices such as frequency synthesizers, a/D, D/a, etc. in digital arrays are gradually moved from the antenna to the processing terminal in order to minimize the load on the front end of the antenna. Therefore, the front end of the antenna is simplified to only reserve the antenna, T/R (Transmitter and Receiver) and frequency conversion equipment, and the clock and local oscillator signals undertake the information transmission task of the front end of the antenna and the processing terminal, thereby greatly reducing various loads of the front end. At present, most of clock and local oscillation signals are processed by microwave frequency conversion and microwave amplification and then transmitted through a radio frequency cable. With the increasing requirements of radar use, the following disadvantages of clock and local oscillator signal transmission by radio frequency cables occur: a) Each frequency band needs a separate radio frequency link, and the system is large and complex; b) When multiple frequency bands work simultaneously, the electromagnetic interference among the frequency bands seriously restricts the system performance; the traditional electronic design scheme has poor capability of resisting external malicious interference; c) The long-distance transmission insertion loss of the radio frequency cable is large, and in order to compensate the insertion loss, a multi-stage amplifying circuit is usually adopted, so that more unstable performance links can be introduced; d) The isolation and interference problems of multipath signals are prominent.
Disclosure of Invention
Aiming at the technical problem that signal transmission depends on radio frequency cable transmission when the antenna is separated from the processing equipment, the invention aims to provide a radar clock and local oscillator signal transmission system based on a microwave photon technology.
The purpose of the invention is realized by adopting the following technical scheme. The invention provides a radar clock and local oscillator signal transmission system based on a microwave photon technology, which comprises a light emitting module and an optical splitter, wherein the light emitting module is used for modulating radio-frequency signals of corresponding categories into optical signals; the system also comprises an optical receiving module which demodulates the optical signals into radio frequency signals, the optical receiving module corresponds to the optical signals split by the optical splitter one by one, and the optical receiving module is connected with the optical splitter through optical fibers.
Further, the radio frequency signals include clock signals, local oscillator signals 1, local oscillator signals 2 and monitoring signals, various radio frequency signals correspond to the optical transmission modules one to one, and the optical transmission modules convert the corresponding radio frequency signals into corresponding optical signals.
Further, an optical transmitting module corresponding to each type of radio frequency signal and an optical splitter corresponding to the optical transmitting module are integrated to be set as front-end equipment; the front-end equipment is connected with the back-end equipment through optical fibers, the back-end equipment corresponds to optical signals split by the optical splitter one by one, each back-end equipment is integrally arranged by a plurality of optical receiving modules, the types of the optical signals received by the optical receiving modules on the same back-end equipment are different in pairs, and the optical signals received by the optical receiving modules on the same back-end equipment comprise all the types of the optical signals.
Furthermore, the optical splitter is a 1 × 8 optical splitter, and eight pieces of backend equipment are correspondingly arranged.
Furthermore, power supply circuits of the front-end equipment and the rear-end equipment are both provided with pi-type filters.
Furthermore, the front-end equipment and the rear-end equipment are both provided with voltage stabilizing circuits.
Furthermore, the front-end equipment is provided with a power interface for connecting a power supply, a radio frequency signal inlet for receiving various radio frequency signals, and an optical signal outlet for outputting modulated and branched optical signals; the back-end equipment is provided with an optical signal inlet used for receiving optical signals and a radio frequency signal outlet used for outputting demodulated radio frequency signals.
Further, the radio frequency signal and the optical signal both comprise a digital signal and an analog signal, and the digital signal and the analog signal are wired in a layered mode.
Furthermore, the light receiving module comprises a high-precision light power detection circuit, the high-precision light power detection circuit is used for collecting power information of light signals entering a detector in the light receiving module, the light receiving module further comprises a single chip microcomputer control assembly for carrying out AD sampling processing on the collected information, the single chip microcomputer assembly controls attenuation values of the numerical control attenuator between the two stages of amplifiers in the light receiving module, and consistency of amplitude of output radio frequency signals is guaranteed.
Furthermore, the system also comprises a modulation circuit and a demodulation circuit, wherein the modulation circuit demodulates the radio-frequency signal into an optical signal, and the demodulation circuit demodulates the optical signal into the radio-frequency signal.
Compared with the prior art, the invention has the advantages that:
1. the system adapts to the development of microwave photon technology, combines two research fields of optics and radar, applies the microwave photon technology to the radar, and solves the problem that clock signals and local oscillator signals are not transmitted through radio frequency cables;
2. the optical splitter is used for realizing long-distance multipath transmission of clock and local oscillation signals;
3. the power circuit is additionally provided with a pi-type filter, digital signals and analog signals are arranged in a layered mode, and a voltage stabilizing circuit is additionally arranged, so that high-isolation output between a clock and a local oscillator signal is realized;
4. the high-amplitude consistent transmission of clock and local oscillation signals is realized by utilizing the optical power detection automatic gain control principle;
5. the radio frequency signal is modulated into an optical signal, and the optical signal is demodulated into the radio frequency signal after being transmitted in a long distance, so that high-phase consistency transmission of a clock and a local oscillator signal is realized;
6. integration and modular design of front-end equipment and rear-end equipment realize the transmission of small-size clocks and local oscillator signals, can be installed in the existing radar system, accelerate the popularization of microwave photon technology in the radar system, and improve the identification precision and integrity of the radar.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of a radar clock and local oscillator signal transmission system based on microwave photonic technology according to the present invention;
FIG. 2 is a block diagram of the modulation scheme of FIG. 1 for converting RF signals to optical signals;
FIG. 3 is a schematic block diagram of the demodulation scheme of FIG. 1 for converting optical signals to RF signals;
FIG. 4 is a schematic diagram of the optical power detection automatic gain control principle of FIG. 1;
FIG. 5a is a front view of the head end apparatus of FIG. 1;
FIG. 5b is a top view of the front end apparatus of FIG. 1;
FIG. 5c is a rear view of the front end unit of FIG. 1;
FIG. 5d is a side view of the front end apparatus of FIG. 1;
FIG. 6a is a front view of the backend apparatus of FIG. 1;
FIG. 6b is a top view of the backend apparatus of FIG. 1;
fig. 6c is a rear view of the backend device of fig. 1.
[ reference numerals ]
101-optical signal outlet, 102-radio frequency signal inlet, 103-power interface, 201-optical signal inlet and 202-radio frequency signal outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of a radar clock and local oscillator signal transmission system based on microwave photonic technology is shown in fig. 1 to 6 c. The system comprises front-end equipment and rear-end equipment, wherein the front-end equipment is connected with the rear-end equipment through optical fibers. The front-end equipment is provided with an optical transmitter module and a 1 × 8 optical splitter, the back-end equipment is provided with eight pieces of back-end equipment, such as back-end equipment 1 and … … back-end equipment 8 shown in fig. 1, and each back-end equipment is provided with four optical receiver modules for receiving and converting corresponding optical signals. The optical transmission module performs electro-optical conversion on four radio frequency signals, such as one path of clock signal, two paths of local oscillation signals (local oscillation signal 1 and local oscillation signal 2 shown in fig. 1), one path of monitoring signal, and the like, by means of radio frequency optical modulation, and forms corresponding four paths of optical signals after the conversion, which are respectively input to corresponding optical splitters, in this embodiment, a 1 × 8 optical splitter is adopted, so that each path of optical signal is divided into eight paths, that is: the method comprises the steps that a clock signal is converted into a clock optical signal, the local optical signal 1 is converted into a local optical signal 1, the local optical signal 2 is converted into a local optical signal 2, a monitoring signal is converted into a monitoring optical signal, each path of the clock optical signal, each path of the local optical signal 1, each path of the local optical signal 2 and each path of the monitoring optical signal are divided into eight optical signals by a 1 x 8 optical splitter, one path of the eight clock optical signals, one path of the eight local optical signals 1, one path of the eight local optical signals 2 and one path of the eight monitoring optical signals are input into one piece of back-end equipment, each optical signal has eight paths, therefore, eight pieces of back-end equipment are required to carry out photoelectric conversion, four optical receiving modules in each piece of back-end equipment receive optical signals of corresponding categories, and then each piece of back-end equipment converts each path of corresponding optical signal into a radio-frequency signal to output. The front-end equipment and the back-end equipment both have a BIT reporting function and are used for reporting the state of whether the optical signal is normally transmitted or received corresponding to each equipment.
The system converts a clock and a local oscillator signal into an optical signal for transmission by using a radio frequency optical modulation technology, and a modulation schematic block diagram is shown in fig. 2. Each converted optical signal is divided equally into multiple paths by a PLC (planar waveguide) optical splitter and transmitted. The back-end equipment recovers each optical signal into a clock signal and a local oscillator signal by using an optical demodulation technology, thereby completing the long-distance multi-path transmission of the clock signal and the local oscillator signal and simultaneously realizing the high-phase consistency transmission of the clock signal and the local oscillator signal. The demodulation block diagram is shown in fig. 3. In other embodiments, other existing modulation and demodulation techniques may be used to perform corresponding modulation and demodulation on the signal.
The specific principle of modulation is shown in fig. 2, in the modulation circuit, a radio frequency signal firstly enters an impedance matching module and then enters a Laser Diode (LD), an ATC unit controls the temperature of the laser diode, an APC unit detects the optical power emitted by the laser diode so that the optical power does not change with the temperature rise and the service time increase, and the light emitted by the laser diode passes through an isolator and then is output.
As shown in fig. 3, in the demodulation circuit, a Photodiode (PD) receives an optical signal, converts the optical signal into a radio frequency signal, sequentially enters an impedance matching module and a noise amplifier (LNA), and a received radio frequency power detection module detects the radio frequency signal passing through the noise amplifier and outputs the radio frequency signal.
The three measures realize that the isolation index among the multipath signals reaches more than 60dB, solve the problem of crosstalk among the signals and realize high isolation output among clocks and local oscillation signals.
For such transmission systems, amplitude consistency between signals is a very important indicator and is also a difficult point. The loss of each part of the transmission system has 3.5dB amplitude inconsistency on optical signals, and has 7dB amplitude inconsistency on radio frequency signals. In order to realize amplitude consistency, photoelectric conversion is realized by using an optical power detection automatic gain control principle, which specifically comprises the following steps: firstly, a high-precision optical power detection circuit is adopted to collect power information of an optical signal entering a detector in an optical receiving module, then a single chip microcomputer AD sampling processing (realized by a single chip microcomputer control assembly in figure 4) is adopted to control an attenuation value of a numerical control attenuator between two stages of amplifiers (a first-stage amplifier and a second-stage amplifier in figure 4), and when the power of each path of input optical signal changes within a certain range, the output power of the amplifiers keeps unchanged, so that the amplitude consistency of the output radio frequency signal is ensured, and the high-amplitude consistency transmission of a clock and a local oscillator signal is realized.
The front-end equipment and the rear-end equipment are integrated and modularized, high reliability of products is guaranteed, and transmission of small-size clocks and local oscillation signals is achieved. As shown in fig. 5a to 6c, the front-end device is provided with a power interface 103, a radio frequency signal inlet 102, and an optical signal outlet 101, where the radio frequency signal inlet 102 is configured to receive various radio frequency signals, the optical signal outlet 101 is configured to output modulated and divided optical signals, and the power interface 103 is configured to connect to a power supply; the back-end equipment is provided with an optical signal inlet 201 and a radio frequency signal outlet 202, wherein the optical signal inlet 201 is used for receiving optical signals, and the radio frequency signal outlet 202 is used for outputting demodulated radio frequency signals. The system can be installed in the existing radar system, the popularization of the microwave photon technology in the radar system is accelerated, and meanwhile, the identification precision and integrity of the radar are improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a radar clock, local oscillator signal transmission system based on microwave photon technique which characterized in that: the optical fiber signal processing device comprises an optical transmitting module and an optical splitter, wherein the optical transmitting module is used for modulating radio-frequency signals of corresponding types into optical signals, and the optical splitter is connected with the corresponding optical transmitting module and is used for splitting the optical signals into multiple optical signals; the system also comprises an optical receiving module which demodulates the optical signals into radio frequency signals, the optical receiving module corresponds to the optical signals split by the optical splitter one by one, and the optical receiving module is connected with the optical splitter through optical fibers.
2. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 1, wherein: the radio frequency signals comprise clock signals, local oscillator signals 1, local oscillator signals 2 and monitoring signals, various radio frequency signals correspond to the light emitting modules one to one, and the light emitting modules convert the corresponding radio frequency signals into corresponding optical signals.
3. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 2, wherein: the light emitting modules corresponding to the radio frequency signals and the optical splitters corresponding to the light emitting modules are integrated to form front-end equipment; the front-end equipment is connected with the back-end equipment through optical fibers, the back-end equipment corresponds to optical signals split by the optical splitter one by one, each back-end equipment is integrally arranged by a plurality of optical receiving modules, the types of the optical signals received by the optical receiving modules on the same back-end equipment are different in pairs, and the optical signals received by the optical receiving modules on the same back-end equipment comprise all the types of the optical signals.
4. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 3, wherein: the optical branching device is a 1 x 8 optical branching device, and eight rear-end devices are correspondingly arranged.
5. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 3 or 4, wherein: and power supply circuits of the front-end equipment and the rear-end equipment are both provided with pi-type filters.
6. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 3 or 4, wherein: and the front-end equipment and the rear-end equipment are both provided with voltage stabilizing circuits.
7. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to claim 3 or 4, wherein: the front-end equipment is provided with a power interface (103) for connecting a power supply, a radio frequency signal inlet (102) for receiving various radio frequency signals and an optical signal outlet (101) for outputting modulated and branched optical signals; the back-end equipment is provided with an optical signal inlet (201) for receiving an optical signal, and a radio frequency signal outlet (202) for outputting a demodulated radio frequency signal.
8. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to any one of claims 1 to 4, wherein: the radio frequency signal and the optical signal both comprise a digital signal and an analog signal, and the digital signal and the analog signal are wired in a layered mode.
9. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to any one of claims 1 to 4, wherein: the light receiving module comprises a high-precision light power detection circuit, the high-precision light power detection circuit is used for collecting power information of light signals entering a detector in the light receiving module, the light receiving module further comprises a single chip microcomputer control assembly for AD sampling processing of the collected information, the single chip microcomputer assembly controls attenuation values of a numerical control attenuator between two stages of amplifiers in the light receiving module, and consistency of output radio frequency signal amplitude is guaranteed.
10. The microwave photonic technology-based radar clock and local oscillator signal transmission system according to any one of claims 1 to 4, wherein: the optical fiber cable further comprises a modulation circuit and a demodulation circuit, wherein the modulation circuit demodulates the radio-frequency signals into optical signals, and the demodulation circuit demodulates the optical signals into the radio-frequency signals.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115913370A (en) * | 2022-09-29 | 2023-04-04 | 西安空间无线电技术研究所 | Multi-chip hybrid integrated satellite-borne array type microwave photon frequency converter |
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| CN209072499U (en) * | 2019-01-08 | 2019-07-05 | 南京法利义电子有限公司 | A kind of radar radio frequency photoreceiver |
| CN111693943A (en) * | 2020-06-05 | 2020-09-22 | 西安电子科技大学 | Small frequency agility phased array radar based on Radio Frequency System On Chip (RFSOC) |
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2021
- 2021-08-25 CN CN202110982377.1A patent/CN113890615A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103684605A (en) * | 2013-11-29 | 2014-03-26 | 西安空间无线电技术研究所 | Microwave photonics based multi-channel signal transmission system for aperture synthesis radiometer |
| CN105846899A (en) * | 2016-05-05 | 2016-08-10 | 长春理工大学 | Broadband radio frequency signal optical fiber transmission system |
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Application publication date: 20220104 |