CN114035180B - 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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- CN114035180B CN114035180B CN202111305098.8A CN202111305098A CN114035180B CN 114035180 B CN114035180 B CN 114035180B CN 202111305098 A CN202111305098 A CN 202111305098A CN 114035180 B CN114035180 B CN 114035180B
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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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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 frequency synthesizer outputs signals to a plurality of paths of phase shifters which are connected in series, each path of phase shifter is divided into two paths of output through the power divider after phase shifting and time varying, one path of signal is directly output, the other path of signal is output to the next path of phase shifter, and nonlinear frequency offset is generated through the frequency offset control module; the multi-path serial phase shifter also greatly improves the correlation among all paths of signals and ensures the phase coherence of multi-path output signals.
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 among 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 a single-path frequency signal needs to be generated, the single-path frequency signal is divided into multiple paths of signals through the frequency multiplexer, and the multiple paths of signals can be obtained through the controllable time-varying phase shifter array, so that the problem of the generation of the multiple paths of signals can be solved, the frequency source structure of the frequency control array can be simplified, the cost is saved, meanwhile, the excellent signal characteristic of a single-path frequency synthesis technology can be inherited, and the phase coherence among the multiple paths of 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, the instantaneous phase is the integral of the frequency in the time domain and the frequency is the derivative of the 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 a 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 controlled by the outside, 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 controllable time-varying phase shifter array, the power divider 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 frequency synthesis to the controllable time-varying phase shifter array;
the controllable time-varying phase shifter array consists of n phase shifters in the same structure and in series, and the time-varying characteristic of each phase shifter is determined by the frequency deviation control module; in the controllable time-varying phase shifter array, each phase shifter signal x' (t) is divided into two paths of output after being subjected to phase shifting in sequence, wherein one path of signal is output to the next path of phase shifter, and the other path of signal is output to the frequency offset control module;
the power divider divides the signals of each phase shifter controlled by the frequency deviation control module after time variation into two paths of signals, one path of signals is directly output, and the other path of signals is output to the next path of phase shifter;
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 f 0 The frequency synthesizer parameter is r, the phase difference generated by the ith phase shifter is
Frequency of the frequency deviation control module is f inc The time-varying characteristic is G (t); then the frequency synthesizer performs frequency synthesis on the reference signal x (t) to obtain a frequency rf 0 The signal x' (t) is input to the controllable time-varying phase shifter array; controllable time-varying phase shifter arrayIn the method, each phase shifter signal x' (t) is subjected to phase shifting in sequence and then is divided into two paths of output through a power divider under the control of a frequency offset control module, one path of signal is directly output, and the other path of signal is output to the next path of phase shifter; wherein, the j-th phase shifter accumulates the generated phase difference
Comprises the following steps:
phase difference
Performing signal time variation according to the time-varying characteristic G (t) under the control of the frequency deviation control module to obtain 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:
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 time variation of an output signal of the phase shifter, thereby realizing frequency offset design of a frequency control array signal. The frequency synthesizer outputs signals to a plurality of paths of phase shifters connected in series, each path of phase shifter is divided into two paths of output through a power divider after phase shifting and time varying, one path of signal is directly output, the other path of signal is output to the next path of phase shifter, and nonlinear frequency offset is generated through a frequency offset control module. The multi-path serial phase shifter also greatly improves the correlation among all paths of signals and ensures the phase coherence of multi-path output signals. Compared with the traditional multi-path frequency synthesis circuit, the multi-path coherent signal generation circuit has the advantages that hardware cost is greatly saved, the output multi-path signals have the characteristics of coherence, adjustable frequency and the like, and the multi-path coherent signal generation circuit is widely suitable for requirements of various applications on frequency sources.
Meanwhile, the method for generating the nonlinear frequency offset for the large-scale frequency control array further 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) The invention adopts the controllable time-varying phase shifter, greatly simplifies the circuit structure, reduces the manufacturing cost, ensures the coherent characteristic of multi-path signals by a serial structure, and 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 generating 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 controllable time-varying phase shifter array, the power divider and the frequency offset control module;
the frequency synthesizer carries out frequency synthesis on the reference signal x (t), and then outputs the signal x' (t) after frequency synthesis to the controllable time-varying phase shifter array;
the controllable time-varying phase shifter array consists of n phase shifters in the same structure and in series, and the time-varying characteristic of each phase shifter is determined by the frequency deviation control module; in the controllable time-varying phase shifter array, after each phase shifter signal x' (t) is subjected to phase shifting and time varying in sequence, the phase shifter signal is divided into two paths of signal output through a power divider, one path of signal is directly output, and the other path of signal is output to the next path of phase shifter;
the power divider divides the phase-shifted and time-varying signal of each phase shifter into two paths to output one path of signal for direct output, and the other path of signal is output to the next path of phase shifter;
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;
in this embodiment, let f be the frequency of the reference signal x (t) 0 The frequency synthesizer parameter is r, r is integer or fractional, the phase difference generated by the ith phase shifter is
Frequency of the frequency deviation control module is f inc The 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 rf 0 The signal x' (t) is input to the controllable time-varying phase shifter array; in the controllable time-varying phase shifter array, each phase shifter signal x' (t) is divided into two paths of output after being subjected to phase shifting in sequence, wherein one path of signal is output to the next path of phase shifter, and the other path of signal is output to the frequency offset control module; wherein the phase difference generated by the jth phase shifter
Comprises the following steps:
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-varying characteristic G (t) to further obtain 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 is characterized by comprising: the frequency synthesizer, the controllable time-varying phase shifter array, the power divider 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 frequency synthesis to the controllable time-varying phase shifter array;
the controllable time-varying phase shifter array consists of n phase shifters with the same structure and in series, and the time-varying characteristic of each phase shifter is determined by the frequency deviation control module; in the controllable time-varying phase shifter array, each phase shifter signal x' (t) is subjected to sequential phase shifting and time varying, and then is divided into two paths of output through a power divider, wherein one path of signal is directly output, and the other path of signal is output to the next path of phase shifter;
the power divider divides the phase-shifted and time-varying signal of each phase shifter into two paths to output one path of signal for direct output, and the other path of signal is output to the next path of phase shifter;
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 frequency of reference signal x (t) be f 0 The frequency synthesizer parameter is r, the phase difference generated by the ith phase shifter is
Frequency of the frequency deviation control module is f inc The time-varying characteristic is G (t); then the frequency synthesizer performs frequency synthesis on the reference signal x (t) to obtain the frequency rf 0 The signal x' (t) is input into the controllable time-varying phase shifter array; in the controllable time-varying phase shifter array, each phase shifter signal x' (t) is subjected to sequential phase shifting and time varying, and then is divided into two paths of output through a power divider, wherein one path of signal is directly output, and the other path of signal is output to the next path of phase shifter; wherein the phase difference generated by the jth phase shifter
Comprises the following steps:
phase difference
Performing signal time variation according to the time-varying characteristic G (t) under the control of the frequency deviation control module to obtain the nonlinear frequency deviation
Finally, the controllable time-varying phase shifter array generates n paths of frequency control array signals with nonlinear frequency offsets according to the nonlinear frequency offsets, and the frequency value of each path is as follows:
2. the LSI non-linear frequency offset generation circuit of claim 1, wherein the frequency synthesizer parameter r is integer or fractional.
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| US5465097A (en) * | 1993-07-12 | 1995-11-07 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Direct sequence spread spectrum direction finder |
| CN107576941A (en) * | 2017-08-18 | 2018-01-12 | 南京理工大学 | The when constant single goal focus method of battle array is controlled based on single-side belt time-modulation frequency |
| CN108254740A (en) * | 2018-01-21 | 2018-07-06 | 南京理工大学 | The wave beam integrated approach of frequency diversity array radar based on non-homogeneous array element spacing |
| CN108896983A (en) * | 2018-05-10 | 2018-11-27 | 电子科技大学 | A kind of when invariant space focused beamforming method for controlling battle array based on frequency |
| CN109901149A (en) * | 2019-03-25 | 2019-06-18 | 西安电子科技大学 | A kind of target component estimation method based on FDA-MIMO radar |
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| JP5226185B2 (en) * | 2006-02-15 | 2013-07-03 | 富士通株式会社 | Detecting and ranging device |
| US8542768B2 (en) * | 2009-12-21 | 2013-09-24 | Dali Systems Co. Ltd. | High efficiency, remotely reconfigurable remote radio head unit system and method for wireless communications |
| CN202167621U (en) * | 2011-07-05 | 2012-03-14 | 中国航空无线电电子研究所 | Electric tuning filtering active antenna used for DGPS beacon receiver |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5465097A (en) * | 1993-07-12 | 1995-11-07 | Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of National Defence Of Her Majesty's Canadian Government | Direct sequence spread spectrum direction finder |
| CN107576941A (en) * | 2017-08-18 | 2018-01-12 | 南京理工大学 | The when constant single goal focus method of battle array is controlled based on single-side belt time-modulation frequency |
| CN108254740A (en) * | 2018-01-21 | 2018-07-06 | 南京理工大学 | The wave beam integrated approach of frequency diversity array radar based on non-homogeneous array element spacing |
| CN108896983A (en) * | 2018-05-10 | 2018-11-27 | 电子科技大学 | A kind of when invariant space focused beamforming method for controlling battle array based on frequency |
| CN109901149A (en) * | 2019-03-25 | 2019-06-18 | 西安电子科技大学 | A kind of target component estimation method based on FDA-MIMO radar |
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