CN112187361A - Space emission phase-coherent synthesis system based on optical fiber phase-stable transmission - Google Patents
Space emission phase-coherent synthesis system based on optical fiber phase-stable transmission Download PDFInfo
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Abstract
The invention provides a space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission, which comprises a light transmitting module, a plurality of phase-stable transmission true delay compensation modules, an optical fiber, a plurality of light receiving modules, a delay measurement control module and a plurality of transmitting antennas, wherein the light transmitting module is used for transmitting light beams; the optical transmitting module is used for realizing the modulation of broadband microwave signals and shunting the signals. The invention adopts the optical fiber phase-stable transmission method based on the multi-frequency point true delay high-precision measurement and the optical true delay compensation, so that the phase consistency among the sub-stations can be realized, the true delay can also reach consistency, and the phase coherence performance among the sub-stations is ensured.
Description
Technical Field
The invention belongs to the radar and electronic warfare technologies, and particularly relates to a space launching coherent synthesis system based on optical fiber phase-stabilized transmission.
Background
In the research fields of distributed radar systems, distributed cooperative electronic countermeasure and the like, signals from different substations need to be superposed, and the signals are required to have coherence. Therefore, the microwave signal at the local end must be transmitted to each sub-site with minimal phase fluctuation, and the phase consistency between the sub-sites is required to be good. Compared with a coaxial cable, the optical fiber link has the advantages of low loss, good phase stability, large transmission bandwidth, electromagnetic interference resistance and the like, so that the microwave photon-based optical fiber transmission technology provides good conditions for application of a distributed system.
However, the optical fiber itself is easily affected by external temperature, stress and other environmental factors to cause phase jitter, and for long-distance signal transmission required by the distributed system, the phase and delay difference caused by the transmission process cannot be ignored due to the coherent factors, and the performance index of the distributed and coherent system is directly restricted by the phase and coherent characteristics. Therefore, the good optical fiber phase-stabilizing transmission performance is the guarantee of the good space synthesis and detection capability of the distributed phase-coherent system.
The current scheme of the optical fiber phase-stabilized transmission system mainly adopts a phase discrimination compensation mode, cannot measure and compensate the absolute delay difference among all branch stations of a distributed system, and partially adopts a pulse time measurement scheme to have the problem of low precision.
Disclosure of Invention
The invention aims to provide a space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission, which aims to solve the problem that the real delay time difference compensation cannot be realized or the compensation precision is low in the conventional space transmitting phase-coherent synthesis system.
The technical solution for realizing the purpose of the invention is as follows: a space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission comprises a light transmitting module, a plurality of phase-stable transmission true delay compensation modules, optical fibers, a plurality of light receiving modules, a delay measurement control module and a plurality of transmitting antennas;
the optical transmitting module is used for realizing the modulation of broadband microwave signals and shunting the signals;
the phase-stable transmission real time delay compensation module realizes the time delay compensation of each branch signal according to the time delay compensation data provided by the time delay measurement control module;
the optical fiber is used for realizing one-to-one corresponding connection of the plurality of phase-stable transmission true delay compensation modules and the plurality of light receiving modules;
the optical receiving module is used for demodulating broadband microwave signals;
the delay measurement control module is used for calculating the delay difference between the branch signals and controlling the phase-stable transmission true delay compensation module to compensate the delay difference;
the transmitting antenna is used for transmitting the microwave signal to the space.
Preferably, the optical transmitting module realizes modulation of the broadband microwave signal by adopting an external modulation mode.
Preferably, the phase-stable transmission true delay compensation module adopts an optical true delay technology to realize the compensation of the true delay time difference of each branch signal.
Preferably, the optical true delay technology adopted by the phase-stable transmission true delay compensation module is any one or combination of an optical fiber delay line based on an optical switch, a piezoelectric ceramic optical fiber stretcher, a temperature control optical fiber delay line and an electric control optical fiber delay line.
Preferably, the specific formula for calculating the delay of each branch signal by the delay measurement control module is as follows:
in the formula (I), the compound is shown in the specification,
is the phase, f is the frequency, and k is the slope of the frequency versus phase curve.
Compared with the prior art, the invention has the following remarkable advantages: the invention adopts the optical fiber phase-stable transmission method based on the multi-frequency point true delay high-precision measurement and the optical true delay compensation, so that the phase consistency among all the sub-stations can be realized, the true delay can also reach consistency, the phase coherent performance among all the sub-stations is ensured, and the good space synthesis and detection capability of the system is realized.
The present invention is described in further detail below with reference to the attached drawings.
Drawings
Fig. 1 is a structural diagram of a spatial emission coherent synthesis system based on optical fiber phase-stabilized transmission.
FIG. 2 is a directional diagram of a darkroom test at a frequency of 6GHz under two branches of a space transmitting coherent synthesis system based on optical fiber phase-stabilized transmission.
FIG. 3 is a directional diagram of a darkroom test at a frequency of 12GHz under two branches of a space transmitting coherent synthesis system based on optical fiber phase-stabilized transmission.
Detailed Description
A space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission comprises a light emitting module 1, a plurality of phase-stable transmission real time delay compensation modules 2, an optical fiber 3, a plurality of light receiving modules 4, a time delay measurement control module 5 and a plurality of transmitting antennas 6.
The optical transmission module 1 realizes modulation of high-frequency broadband microwave signals by adopting an external modulation mode, and simultaneously branches the signals and distributes the signals to different optical links.
The phase-stable transmission real time delay compensation module 2 adopts an optical real time delay technology, such as an optical fiber time delay line based on an optical switch, an optical fiber stretcher of piezoelectric ceramics, a temperature control optical fiber time delay line, an electric control optical fiber time delay line and the like, according to the time delay compensation data provided by the time delay measurement control module 5, so as to realize high-precision compensation of the real time delay difference of each branch signal.
The optical fiber 3 is used for realizing one-to-one corresponding connection of the plurality of phase-stable transmission true delay compensation modules 2 and the plurality of light receiving modules 4, and realizing long-distance low-loss transmission of signals.
The optical receiving module 4 is used for demodulating broadband microwave signals.
The delay measurement control module 5 is configured to implement delay measurement of the broadband microwave signals demodulated by each optical receiving module 4, calculate a delay difference between each branch signal, and control the phase-stable transmission true delay compensation module 2 to compensate for the delay difference. The delay measurement is carried out by measuring adjacent multiple frequency points (f)1,f2,…fn) Phase of
Then, the time delay is calculated according to the slope of the frequency and phase curve. The basic calculation relationship is:
in the formula (I), the compound is shown in the specification,
is the phase, f is the frequency, k is the slope of the frequency versus phase curve, i.e.
The frequency points are selected as close as possible.
The transmitting antenna 6 is used for transmitting the microwave signals to the space, so that the space synthesis of the microwave signals is realized.
The invention adopts the multi-frequency point high-precision measurement true time delay at the optical fiber phase stabilization part, then compares the time delay difference of each branch station, and ensures the phase coherent performance of each branch by a method of compensating the optical true time delay, thereby realizing the good space synthesis and detection capability of the system.
Examples
A space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission comprises a light transmitting module 1, 2 phase-stable transmission true delay compensation modules 2-1 and 2-2, an optical fiber 3, 2 light receiving modules 4-1 and 4-2, a delay measurement control module 5 and 2 transmitting antennas 6-1 and 6-2; the light emitting module 1 modulates broadband microwave signals and divides the signals into 2 paths, the phase-stable transmission real time delay compensation modules 2-1 and 2-2 respectively perform time delay compensation on the 1 path of signals according to time delay compensation data provided by the time delay measurement control module 5, the light receiving modules 4-1 and 4-2 respectively demodulate the 2 paths of broadband microwave signals, and the time delay measurement control module 5 realizes time delay measurement of the broadband microwave signals demodulated by the light receiving modules 4. The transmitting antennas 6-1 and 6-2 respectively transmit 2 paths of microwave signals to the space.
As can be seen from fig. 2 and 3, after the phase-stabilizing delay compensation, the directional diagrams of the respective branches are substantially consistent, and compared with the directional diagrams of the respective branches, the spatially synthesized directional diagrams have a signal gain that is 6dB greater.
Claims (5)
1. A space transmitting phase-coherent synthesis system based on optical fiber phase-stable transmission is characterized by comprising a light transmitting module, a plurality of phase-stable transmission true delay compensation modules, an optical fiber, a plurality of light receiving modules, a delay measurement control module and a plurality of transmitting antennas;
the optical transmitting module is used for realizing the modulation of broadband microwave signals and shunting the signals;
the phase-stable transmission real time delay compensation module realizes the time delay compensation of each branch signal according to the time delay compensation data provided by the time delay measurement control module;
the optical fiber is used for realizing one-to-one corresponding connection of the plurality of phase-stable transmission true delay compensation modules and the plurality of light receiving modules;
the optical receiving module is used for demodulating broadband microwave signals;
the delay measurement control module is used for calculating the delay difference between the branch signals and controlling the phase-stable transmission true delay compensation module to compensate the delay difference;
the transmitting antenna is used for transmitting the microwave signal to the space.
2. The space-launch coherent synthesis system based on fiber-optic stationary phase transmission according to claim 1, characterized in that the optical transmission module uses an external modulation mode to realize the modulation of broadband microwave signals.
3. The optical fiber phase-stabilized transmission-based spatial emission coherent synthesis system according to claim 1, wherein the phase-stabilized transmission true delay compensation module employs an optical true delay technique to realize compensation of true delay differences of each branch signal.
4. The optical fiber phase-stabilized transmission-based spatial emission phase-coherent synthesis system according to claim 3, wherein the phase-stabilized transmission true delay compensation module employs an optical true delay technique that is any one or a combination of an optical switch-based optical fiber delay line, a piezoelectric ceramic optical fiber stretcher, a temperature-controlled optical fiber delay line, and an electrically controlled optical fiber delay line.
5. The space transmitting coherent combining system based on the fiber phase-stabilized transmission according to claim 1, wherein the specific formula for the delay measurement control module to calculate the delay of each branch signal is as follows:
in the formula (I), the compound is shown in the specification,
is the phase, f is the frequency, and k is the slope of the frequency versus phase curve.
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| CN114726443A (en) * | 2022-02-25 | 2022-07-08 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
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| CN108551363A (en) * | 2018-04-19 | 2018-09-18 | 中国电子科技集团公司第二十九研究所 | Array radio frequency fiber optic link signal phase change monitoring method, monitoring system and signal phase adjusting method |
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| CN114726443A (en) * | 2022-02-25 | 2022-07-08 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
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