CN114047500A - Large-scale frequency control array nonlinear frequency offset generation circuit - Google Patents
Large-scale frequency control array nonlinear frequency offset generation circuit Download PDFInfo
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- CN114047500A CN114047500A CN202111304624.9A CN202111304624A CN114047500A CN 114047500 A CN114047500 A CN 114047500A CN 202111304624 A CN202111304624 A CN 202111304624A CN 114047500 A CN114047500 A CN 114047500A
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
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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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/16—Networks for phase shifting
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/18—Networks for phase shifting
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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
Abstract
The invention discloses a large-scale frequency control array nonlinear frequency offset generating circuit, which converts phase difference generated by a phase shifter into frequency offset by controlling time variation of an output signal of the phase shifter, thereby realizing frequency offset design of a frequency control array signal. The power divider divides the signal generated by the frequency synthesizer into multiple paths and outputs the multiple paths of signals to the multiple paths of parallel phase shifters respectively, compared with the traditional multiple-path frequency synthesis circuit, the circuit greatly saves the hardware cost, the multiple paths of parallel phase shifters also greatly improve the flexibility of frequency deviation of each path, the output multiple paths of signals have the characteristics of coherence, flexibility and adjustability of frequency and the like, and the power divider is widely suitable for the requirements of various applications on frequency sources.
Description
Technical Field
The invention belongs to the technical field of frequency synthesis, and particularly relates to a large-scale frequency control array nonlinear frequency offset generation circuit.
Background
The frequency control array nonlinear frequency offset generation technology is used for achieving the purpose of changing signal frequency nonlinearly by controlling the time-varying characteristic generation mode of each array element phase shifter of a frequency control array, and for each array element, the phase shifter can be controlled to enable the phase difference of output signals of the phase shifter to generate the time-varying characteristic, so that a frequency control array signal of multiple paths of nonlinear frequency offsets is obtained.
The frequency control array radar technology is a new system array radar technology proposed in recent years. Different from the traditional phased array which only forms transmitting beams with azimuth dependence, the frequency control array realizes the automatic scanning function of the beams by adopting a small frequency difference between array elements. The frequency control array can form a transmitting beam with distance dependence and time variability, and overcomes the defect that the traditional phased array factor does not contain distance and time variables, thereby bringing a plurality of unique application advantages. The large-scale frequency control array can be widely applied to the fields of military affairs and 5G, however, with the increase of the emission array elements of the frequency control array, if each path of array elements adopts an independent frequency synthesis technology, the cost is too high. The frequency multiplexer and the controllable time-varying phase shifter array are introduced, only one-way frequency signals are needed to be generated, the frequency multiplexer is used for dividing the frequency signals into multiple-way signals, and then the multiple-way signals can be obtained through the controllable time-varying phase shifter array, so that the problem of multiple-way signal generation can be solved, the frequency source structure of the frequency control array can be simplified, the cost can be reduced for several months, meanwhile, the excellent signal characteristics of a one-way frequency synthesis technology can be inherited, and the phase coherence among the multiple-way signals can be ensured.
The frequency control array transmits signals with different frequencies, and the signal characteristics are that the signals transmitted by the frequency control array have the same carrier frequency, but each array element transmits a signal with a small frequency offset (the frequency offset is far smaller than the carrier frequency signal). Mathematically and physically, instantaneous phase is the integral of frequency in the time domain and frequency is the derivative of instantaneous phase in the time domain. By combining the signal characteristics of the frequency control array and the physical characteristics, the nonlinear frequency offset can be obtained only by controlling each path of signal phase shifter to generate nonlinear time-varying characteristics.
Each array element of the frequency control array adopts different transmitting signal carrier frequencies, and the frequency deviation among the array elements causes the array transmitting beam directional diagram to change along with the change of the frequency deviation. The frequency offset of the conventional frequency control array is mostly fixed, that is, the frequency offset between array elements is linearly changed. The linear frequency offset enables the frequency control array transmitting beam pattern to be relatively fixed and lack changes. The frequency deviation generated by the controllable time-varying phase shifter array is related to the time-varying characteristic of external control, and the nonlinear frequency deviation can be obtained by controlling the time-varying characteristic of the phase shifter array. And combining the relationship between the frequency deviation of the frequency control array and the array emission beam pattern to obtain a more flexible and variable array emission beam pattern.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a large-scale frequency control array nonlinear frequency offset generation circuit which generates nonlinear frequency offset by controlling the time variation of a phase shifter and solves the problem of phase reference among output signals and has a simple structure.
In order to achieve the above object, the present invention provides a large-scale frequency-controlled array nonlinear frequency offset generating circuit, comprising: the frequency synthesizer, the power divider, the controllable time-varying phase shifter array and the frequency offset control module;
the frequency synthesizer carries out frequency synthesis on a reference signal x (t), and then outputs a signal x' (t) after the frequency synthesis to the power divider;
the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) the number of signal paths output by the phase shifters is consistent with the number of phase shifters in the controllable time-varying phase shifter array, and finally, each path is respectively input to the corresponding phase shifter;
the controllable time-varying phase shifter array consists of n phase shifters with the same structure and in parallel, and the time-varying characteristic of each phase shifter is determined by a frequency deviation control module;
the frequency offset control module is used for controlling the signals of each phase shifter after phase shifting to carry out signal time varying according to time varying characteristics so as to obtain nonlinear frequency offset;
let the frequency of the reference signal x (t) be f0The frequency synthesizer parameter is r, and the frequency deviation control module frequency is fincTime-varying characteristic G (t); then the frequency synthesizer performs frequency synthesis on the reference signal x (t) to obtain the frequency rf0The signal x' (t) is inputted to the power divider; the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) inputting the phase difference signals into a controllable time-varying phase shifter array, wherein each phase shifter shifts the phase of the input signals to generate phase difference
The phase difference is subjected to signal time variation under the control of the frequency deviation control module according to the time variation characteristic G (t), and then nonlinear frequency deviation is obtained
Finally, the controllable time-varying phase shifter array generates n paths of frequency control array signals with nonlinear frequency offset according to the nonlinear frequency offset, and the frequency value of each path is as follows:
the invention aims to realize the following steps:
the invention relates to a large-scale frequency control array nonlinear frequency offset generating circuit, which converts phase difference generated by a phase shifter into frequency offset by controlling the time variation of an output signal of the phase shifter, thereby realizing the frequency offset design of a frequency control array signal. The power divider divides the signal generated by the frequency synthesizer into multiple paths and outputs the multiple paths of signals to the multiple paths of parallel phase shifters respectively, compared with the traditional multiple-path frequency synthesis circuit, the circuit greatly saves the hardware cost, the multiple paths of parallel phase shifters also greatly improve the flexibility of frequency deviation of each path, the output multiple paths of signals have the characteristics of coherence, flexibility and adjustability of frequency and the like, and the power divider is widely suitable for the requirements of various applications on frequency sources.
Meanwhile, the method for generating the nonlinear frequency offset of the large-scale frequency control array also has the following beneficial effects:
(1) the output frequency of the signal is changed in a time-varying mode of the phase shifter, the problem that the frequency interval cannot realize nonlinear change is solved, and meanwhile, the phase noise of each path of output signal can be optimized;
(2) the controllable time-varying phase shifter array is introduced, the problem of nonlinear frequency offset generation of the frequency control array is solved by controlling the time-varying characteristic of the phase shifter, and the influence of the nonlinear frequency offset of the frequency control array on a frequency control array transmitting beam directional diagram can be further researched;
(3) after the controllable time-varying phase shifter is adopted, the circuit structure is greatly simplified, the manufacturing cost is reduced, the flexibility of frequency deviation adjustment is improved due to the parallel structure, and the frequency-varying phase shifter can be widely applied to the field of frequency control array frequency synthesis.
Drawings
FIG. 1 is a schematic diagram of a large-scale frequency-controlled array non-linear frequency offset generating circuit according to the present invention;
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Examples
Fig. 1 is a schematic diagram of a large-scale frequency-controlled array nonlinear frequency offset generation circuit according to the present invention.
In this embodiment, as shown in fig. 1, a large-scale frequency-controlled array nonlinear frequency offset generating circuit according to the present invention includes: the frequency synthesizer, the power divider, the controllable time-varying phase shifter array and the frequency offset control module;
the frequency synthesizer carries out frequency synthesis on the reference signal x (t), and then outputs a signal x' (t) after the frequency synthesis to the power divider;
the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) the number of signal paths output by the phase shifters is consistent with the number of phase shifters in the controllable time-varying phase shifter array, and finally, each path is respectively input to the corresponding phase shifter;
the controllable time-varying phase shifter array consists of n phase shifters with the same structure and in parallel, and the time-varying characteristic of each phase shifter is determined by the frequency deviation control module;
the frequency offset control module is used for controlling the signals of each phase shifter after phase shifting to carry out signal time varying according to time varying characteristics so as to obtain nonlinear frequency offset; in this embodiment, the frequency offset control module is composed of an FPGA or DSP chip and an external control code;
let the frequency of the reference signal x (t) be f0The frequency synthesizer parameter is r, r is integer or fraction, and the frequency deviation control module frequency is fincThe time-varying characteristic is G (t), and G (t) is a nonlinear time-varying characteristic, such as a polynomial, an exponential, a logarithm and the like; then the frequency synthesizer performs frequency synthesis on the reference signal x (t) to obtain the frequency rf0The signal x' (t) is inputted to the power divider; the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) inputting the phase difference signals into a controllable time-varying phase shifter array, wherein each phase shifter shifts the phase of the input signals to generate phase difference
In this embodiment, since the time-varying characteristic of the frequency offset control module is nonlinear, the phase difference is obtained
Performing signal time variation under the control of the frequency deviation control module according to the time variation characteristic G (t), and further obtaining the nonlinear frequency deviation
Finally, the controllable time-varying phase shifter array generates n paths of frequency control array signals with nonlinear frequency offset according to the nonlinear frequency offset, and the frequency value of each path is as follows:
although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (2)
1. A large-scale frequency-controlled array nonlinear frequency offset generating circuit, comprising: the frequency synthesizer, the power divider, the controllable time-varying phase shifter array and the frequency deviation control module.
The frequency synthesizer carries out frequency synthesis on a reference signal x (t), and then outputs a signal x' (t) after the frequency synthesis to the power divider;
the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) the number of signal paths output by the phase shifters is consistent with the number of phase shifters in the controllable time-varying phase shifter array, and finally, each path is respectively input to the corresponding phase shifter;
the controllable time-varying phase shifter array consists of n phase shifters with the same structure and in parallel, and the time-varying characteristic of each phase shifter is determined by a frequency deviation control module;
the frequency offset control module is used for controlling the signals of each phase shifter after phase shifting to carry out signal time varying according to time varying characteristics so as to obtain nonlinear frequency offset;
let the frequency of the reference signal x (t) be f0The frequency synthesizer parameter is r, and the frequency deviation control module frequency is fincTime-varying characteristic G (t); then the frequency synthesizer performs frequency synthesis on the reference signal x (t) to obtain the frequency rf0The signal x' (t) is inputted to the power divider; the power divider divides the signal x' (t) into a plurality of output signals x1(t),x2(t),…,xn(t) inputting the phase difference signals into a controllable time-varying phase shifter array, wherein each phase shifter shifts the phase of the input signals to generate phase difference
The phase difference is subjected to signal time variation under the control of the frequency deviation control module according to the time variation characteristic G (t), and then nonlinear frequency deviation is obtained
Finally, the controllable time-varying phase shifter array generates n paths of frequency control array signals with nonlinear frequency offset according to the nonlinear frequency offset, and the frequency value of each path is as follows:
2. the large-scale frequency-controlled array nonlinear frequency offset generation circuit as claimed in claim 1, wherein said frequency synthesizer parameter r is an integer or a fraction.
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| WO2019215734A1 (en) * | 2018-05-07 | 2019-11-14 | Arbe Robotics Ltd. | Fmcw automotive radar incorporating nonlinear frequency hopping sequence of fractional bandwidth multiband chirps with spectral probability windowing |
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2021
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Patent Citations (8)
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| US20090189691A1 (en) * | 2008-01-28 | 2009-07-30 | Qualcomm Incorporated | Method and apparatus for reducing intermodulation distortion in an electronic device having an amplifier circuit |
| US20110063711A1 (en) * | 2009-06-25 | 2011-03-17 | Nucrypt, Inc. | System and method for generating optical radiation of controllable spectral content |
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| WO2019215734A1 (en) * | 2018-05-07 | 2019-11-14 | Arbe Robotics Ltd. | Fmcw automotive radar incorporating nonlinear frequency hopping sequence of fractional bandwidth multiband chirps with spectral probability windowing |
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