CN112702120B - Radio frequency forwarding system based on radio frequency optical fiber storage - Google Patents
Radio frequency forwarding system based on radio frequency optical fiber storage Download PDFInfo
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- CN112702120B CN112702120B CN202011600810.2A CN202011600810A CN112702120B CN 112702120 B CN112702120 B CN 112702120B CN 202011600810 A CN202011600810 A CN 202011600810A CN 112702120 B CN112702120 B CN 112702120B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/29—Repeaters
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- H—ELECTRICITY
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- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a radio frequency forwarding system based on radio frequency optical fiber storage, which comprises an AGC circuit module, a power divider, a frequency measurement module, a radio frequency optical fiber storage module, a frequency agility module, a down conversion module and an AD sampling module, wherein the input end of the AGC circuit module is used for receiving radio frequency signals, the output end of the AGC circuit module is electrically connected with the power divider, and the signal output end of the power divider is electrically connected with the frequency measurement module and the signal receiving end of the radio frequency optical fiber storage module respectively. According to the invention, a radio frequency optical fiber storage module is added on the basis of the traditional radio frequency signal forwarding technology, so that the problem of signal loss when the radio frequency signal is forwarded due to time delay of frequency measurement and frequency agility is solved, and the completeness and the damage of the forwarded radio frequency signal are ensured.
Description
Technical Field
The invention relates to the technical field of radar, electronic countermeasure and the like, in particular to a radio frequency forwarding system requiring signal integrity, such as: radar target signal simulation, interference signal forwarding and the like.
Background
In the fields of radar, electronic countermeasure and the like, down-conversion processing of a radio frequency signal received by a system is required to obtain an intermediate frequency signal within an AD sampling frequency range. Because the frequency of the received radio frequency signal is unknown, the radio frequency signal is often required to be subjected to frequency measurement at the receiving front end of the system, according to the frequency value obtained by measurement, the internal frequency conversion local oscillator signal of the system is guided to be changed to the corresponding frequency, the internal local oscillator signal and the received radio frequency signal are subjected to down-mixing to obtain an intermediate frequency signal of a target frequency, and the intermediate frequency signal is subjected to AD sampling processing.
However, this processing method cannot perform a complete down-conversion process on the received rf signal. Because the time required by both traditional frequency measurement and local oscillator agility is very long (the frequency measurement time is T1, the local oscillator agility time is T2, and the total time is T = T1+ T2), the time interval from the time when a received radio frequency signal enters a signal to the time when the local oscillator agility is completed is T, which means that the system has the problems that only the radio frequency signal after the time T can be down-converted, and the signal before the time T is lost completely.
In order to solve the above problems, the present invention provides a radio frequency forwarding system based on radio frequency fiber storage.
Disclosure of Invention
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a radio frequency forwarding system based on radio frequency optic fibre storage, includes that AGC circuit module, merit divide ware, frequency measurement module, radio frequency optic fibre storage module, frequency agility module, down conversion module and AD sampling module, AGC circuit module's input is used for receiving radio frequency signal, AGC circuit module's output and merit divide ware electric connection, the signal output part of merit divide the ware respectively with frequency measurement module and radio frequency optic fibre storage module's signal reception end electric connection, frequency measurement module's signal output part and frequency agility module's signal reception end electric connection, down conversion module's signal reception end respectively with frequency agility module's signal output part and radio frequency optic fibre storage module's signal output part electric connection.
Preferably, the down-conversion module includes a mixer, a filter and an amplifier, the signal receiving terminal of the mixer is electrically connected with the signal output terminal of the frequency agility module, the signal receiving terminal of the mixer is electrically connected with the signal output terminal of the radio frequency optical fiber storage module, the signal output terminal of the mixer is electrically connected with the signal receiving terminal of the filter, the signal output terminal of the filter is electrically connected with the signal receiving terminal of the amplifier, and the signal output terminal of the amplifier is electrically connected with the AD sampling module.
Preferably, an implementation method of a radio frequency forwarding system based on radio frequency fiber storage includes the following steps:
s1: at the moment of TO, a radio frequency signal enters a system, and power adjustment is carried out through a first-stage AGC circuit in an AGC circuit module TO ensure that the power of the signal entering a next-stage AGC circuit is stabilized within a certain range;
s2: the radio frequency signal enters the power divider after being stabilized by the AGC circuit module, the power divider divides the radio frequency signal into two parts, wherein one part of the radio frequency signal enters the frequency measurement module for frequency measurement, and the other part of the radio frequency signal enters the radio frequency optical fiber storage module for 1us delay storage;
s3, in the time of 1us, the frequency measurement module can use a single-bit sampling technology to complete frequency measurement, the time is T1, the frequency measurement module enters the frequency agile module according to the guidance of the frequency measurement value, the frequency agile module uses a direct frequency synthesis technology to complete the agility of local oscillation signals, the time is T2, and the time consumed by the two modules is T = T1+ T2;
s4, the complete radio frequency signal delayed by 1us by the radio frequency optical fiber storage module and the local oscillation signal which is agile and has been completed enter a down-conversion module to be subjected to frequency mixing, filtering, amplifying and other processing for two times, and finally an intermediate frequency signal in the AD sampling frequency range is obtained;
and S5, the AD sampling module carries out AD sampling.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the complete processing of the received radio frequency signal by adding the radio frequency optical fiber storage module and reducing the frequency measurement and frequency agility time on the traditional processing mode, does not lose the carried related information, and solves the problem of the radio frequency signal loss caused by the frequency measurement and frequency agility in the prior art.
2. The frequency agility time of most existing frequency measurement products in the market is about 1us, and the frequency measurement module in the invention adopts a single-bit sampling technology to realize frequency measurement within 200 ns.
3. The radio frequency optical fiber storage module completes 1us radio frequency signal delay storage through electro-optical conversion, optical fiber storage and photoelectric conversion, and gains window time for frequency measurement and frequency agility.
Drawings
Fig. 1 is a block diagram of a radio frequency forwarding system based on radio frequency fiber storage according to the present invention;
fig. 2 is a schematic diagram of changes over time of a medium frequency measurement, frequency hopping, pulse modulation radio frequency signal received by the system, and pulse modulation radio frequency signal after delay of a radio frequency forwarding system based on radio frequency fiber storage according to the present invention.
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.
Referring to fig. 1-2, a radio frequency forwarding system based on radio frequency optical fiber storage includes an AGC circuit module, a power divider, a frequency measurement module, a radio frequency optical fiber storage module, a frequency agility module, a frequency down conversion module and an AD sampling module, an input end of the AGC circuit module is used for receiving a radio frequency signal, an output end of the AGC circuit module is electrically connected with the power divider, a signal output end of the power divider is electrically connected with a signal receiving end of the frequency measurement module and a signal receiving end of the radio frequency optical fiber storage module respectively, a signal output end of the frequency measurement module is electrically connected with a signal receiving end of the frequency agility module, and a signal receiving end of the frequency down conversion module is electrically connected with a signal output end of the frequency agility module and a signal output end of the radio frequency optical fiber storage module respectively.
The down-conversion module comprises a frequency mixer, a filter and an amplifier, wherein the signal receiving end of the frequency mixer is electrically connected with the signal output end of the frequency agile module, the signal receiving end of the frequency mixer is electrically connected with the signal output end of the radio frequency optical fiber storage module, the signal output end of the frequency mixer is electrically connected with the signal receiving end of the filter, the signal output end of the filter is electrically connected with the signal receiving end of the amplifier, and the signal output end of the amplifier is electrically connected with the AD sampling module.
The invention also discloses an implementation method of the radio frequency forwarding system based on the radio frequency optical fiber storage, which comprises the following steps as shown in fig. 1 and fig. 2:
s1: the radio frequency signal enters the system, carry on the power adjustment through the first-class AGC circuit in AGC circuit module at first, make the signal power entering the subordinate AGC circuit stabilize in certain range;
s2: the radio frequency signal enters the power divider after being stabilized by the AGC circuit module, the power divider divides the radio frequency signal into two parts, wherein one part of the radio frequency signal enters the frequency measurement module for frequency measurement, and the other part of the radio frequency signal enters the radio frequency optical fiber storage module for 1us delay storage;
in particular: the radio frequency forwarding system in the step delays and stores the received radio frequency signal in a radio frequency optical fiber storage module, and then performs down-conversion processing on the stored signal, thereby achieving the purpose of no signal loss;
s3, in the time of 1us, the frequency measurement module can use a single-bit sampling technology to complete frequency measurement, the time is T1, the frequency measurement module enters the frequency agile module according to the guidance of the frequency measurement value, the frequency agile module uses a direct frequency synthesis technology to complete the agility of local oscillation signals, the time is T2, and the time consumed by the two modules is T = T1+ T2;
it should be noted that: the time T1 for completing frequency measurement by a frequency measurement module of a single-bit sampling technology is within 200 ns; the time T2 for completing frequency agility by the agility module applying the direct frequency synthesis technology is within 500ns, the total time T = T1+ T2, and T is within 700ns and is less than 1us of the requirement.
S4, the complete radio frequency signal delayed by 1us by the radio frequency optical fiber storage module and the local oscillation signal which is agile and has been completed enter a down-conversion module to be subjected to frequency mixing, filtering, amplifying and other processing for two times, and finally an intermediate frequency signal in the AD sampling frequency range is obtained;
and S5, the AD sampling module carries out AD sampling.
Based on the prior art, the invention overcomes the defect of signal loss caused by the traditional processing mode, and particularly, the radio frequency forwarding system carries out delay storage on the received radio frequency signal in the radio frequency optical fiber storage module and then carries out down-conversion processing on the stored signal, thereby achieving the purpose of no signal loss and solving the problem of radio frequency signal loss caused by frequency measurement and frequency agility in the prior art.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A radio frequency forwarding system based on radio frequency optical fiber storage comprises an AGC circuit module, a power divider, a frequency measuring module, a radio frequency optical fiber storage module, a frequency agility module, a down conversion module and an AD sampling module, and is characterized in that the input end of the AGC circuit module is used for receiving radio frequency signals, the output end of the AGC circuit module is electrically connected with the power divider, the signal output end of the power divider is respectively electrically connected with the signal receiving ends of the frequency measuring module and the radio frequency optical fiber storage module, the signal output end of the frequency measuring module is electrically connected with the signal receiving end of the frequency agility module, the signal receiving end of the down conversion module is respectively electrically connected with the signal output end of the frequency agility module and the signal output end of the radio frequency optical fiber storage module, the down conversion module comprises a frequency mixer, a filter and an amplifier, the signal receiving end of the frequency mixer is electrically connected with the signal output end of the frequency agility module, the signal receiving end of the frequency mixer is electrically connected with the signal output end of the radio frequency optical fiber storage module, the signal output end of the frequency mixer is electrically connected with the signal receiving end of the filter, the signal output end of the filter is electrically connected with the signal receiving end of the amplifier, and the signal output end of the amplifier is electrically connected with the AD sampling module;
specifically, a radio frequency signal enters a system, and power adjustment is performed through a first-stage AGC circuit in an AGC circuit module, so that the power of the signal entering a next-stage AGC circuit is stable; the radio frequency signal is stabilized by the AGC circuit module and then enters the power divider, the power divider divides the radio frequency signal into two parts, wherein one part of the radio frequency signal enters the frequency measurement module for frequency measurement, and the other part of the radio frequency signal enters the radio frequency optical fiber storage module for 1us delay storage; within 1us, the frequency measurement module completes frequency measurement by using a single-bit sampling technology, consumes time T1, and enters the frequency agility module according to guidance of the frequency measurement value, the frequency agility module completes agility of a local oscillation signal by using a direct frequency synthesis technology, consumes time T2, and the consumed time of the two is T = T1+ T2; the complete radio frequency signal delayed by 1us by the radio frequency optical fiber storage module and the local oscillation signal which is subjected to agility enter a down-conversion module to be subjected to frequency mixing, filtering and amplification twice, and an intermediate frequency signal in an AD sampling frequency range is obtained; and the AD sampling module carries out AD sampling.
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| US9882795B1 (en) * | 2015-04-17 | 2018-01-30 | Xilinx, Inc. | Signal loss detector |
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| US7349457B2 (en) * | 2004-03-29 | 2008-03-25 | Aeroflex Powel, Inc. | Broadband frequency agile signal characterization |
| US7835463B2 (en) * | 2007-04-26 | 2010-11-16 | The United States Of America As Represented By The Secretary Of The Department Of The Navy | Digital radio frequency memory |
| US10608647B1 (en) * | 2018-12-14 | 2020-03-31 | Silicon Laboratories Inc. | Delay adjustment using frequency estimation |
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| US9882795B1 (en) * | 2015-04-17 | 2018-01-30 | Xilinx, Inc. | Signal loss detector |
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