Millimeter wave direction finding method, device and system and storage medium

Abstract

The invention provides a millimeter wave direction finding method, device and system and a storage medium, and belongs to the technical field of waveform direction finding, and the method comprises the steps: S1, obtaining original millimeter wave signals from a plurality of receiving antenna array elements; s2, introducing a millimeter wave local oscillator signal and a plurality of antenna phase differences, and performing signal analysis on the millimeter wave local oscillator signal and each original millimeter wave signal to obtain a digital signal; and S3, respectively carrying out phase difference calculation on each digital signal to obtain an original channel phase difference. According to the invention, the limitation that millimeter wave transmission loss is large and amplitude-phase consistency control of multiple times of frequency conversion is difficult in a traditional microwave technology is overcome, the method can adapt to long-distance transmission and frequency conversion processing of wide-dynamic and large-bandwidth millimeter wave signals, and the problems that a traditional direction finding method is large in number of receiving and processing channels, large in size and low in real-time performance are solved; high-precision direction finding of the wide-airspace large-bandwidth millimeter wave interferometer is achieved, and the wide-airspace large-bandwidth millimeter wave interferometer has good application value.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of waveform direction finding, and in particular to a millimeter wave direction finding method, device, system and storage medium. Background Art

[0002] Millimeter-wave communication / radar equipment has the characteristics of wide operating frequency band, narrow beam and low side lobe. Traditional microwave technology is difficult to meet the requirements of electronic warfare equipment for long-distance transmission and frequency conversion processing of large-bandwidth millimeter-wave signals, resulting in limitations such as large millimeter-wave transmission loss and difficulty in controlling the consistency of multiple frequency conversion amplitudes. The traditional millimeter-wave signal direction finding methods are mainly the amplitude difference method and the array beam synthesis method. To meet the requirements of direction finding accuracy within the same airspace range, the amplitude difference method direction finding requires a narrow beam width and a large number of beams, resulting in a large volume; the array beam synthesis method direction finding requires frequency conversion sampling of multiple array antenna elements, and high-precision direction finding is achieved through beam synthesis, but its real-time performance is low. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a millimeter wave direction finding method, device, system and storage medium in view of the deficiencies in the prior art.

[0004] The present invention solves the above technical problems with the following technical solutions: A millimeter wave direction finding method comprises the following steps:

[0005] S1: Obtaining a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements;

[0006] S2: importing a millimeter wave local oscillator signal and a plurality of antenna phase differences, and performing signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals;

[0007] S3: Calculate the phase difference of each digital signal respectively to obtain the original channel phase difference corresponding to each original millimeter wave signal;

[0008] S4: performing correction analysis on all the original channel phase differences according to all the antenna phase differences to obtain target channel phase differences corresponding to each of the original millimeter wave signals;

[0009] S5: Perform direction finding analysis on all the target channel phase differences to obtain millimeter wave direction finding results.

[0010] Another technical solution of the present invention to solve the above technical problem is as follows: A millimeter wave direction finding device, comprising:

[0011] A signal acquisition module, used to obtain a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements;

[0012] Import module, used to import millimeter wave local oscillator signals and multiple antenna phase differences;

[0013] A signal analysis module, used to perform signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals;

[0014] A phase difference calculation module, used to calculate the phase difference of each of the digital signals respectively, to obtain the original channel phase difference corresponding to each of the original millimeter wave signals;

[0015] A correction and analysis module, used to perform correction and analysis on all the original channel phase differences according to all the antenna phase differences, to obtain a target channel phase difference corresponding to each of the original millimeter wave signals;

[0016] The direction finding result acquisition module is used to perform direction finding analysis on all the target channel phase differences to obtain the millimeter wave direction finding result.

[0017] Based on the above-mentioned millimeter wave direction finding method, the present invention also provides a millimeter wave direction finding system.

[0018] Another technical solution of the present invention to solve the above technical problem is as follows: a millimeter wave direction finding system comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the millimeter wave direction finding method as described above is implemented.

[0019] Based on the above-mentioned millimeter wave direction finding method, the present invention also provides a computer-readable storage medium.

[0020] Another technical solution of the present invention to solve the above technical problem is as follows: a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the millimeter wave direction finding method as described above is implemented.

[0021] The beneficial effects of the present invention are as follows: a digital signal is obtained by analyzing the signal of a millimeter-wave local oscillator signal and an original millimeter-wave signal, an original channel phase difference is obtained by calculating the phase difference of the digital signal, a target channel phase difference is obtained by correcting and analyzing the original channel phase difference according to the antenna phase difference, and a millimeter-wave direction-finding result is obtained by direction-finding analysis of the target channel phase difference, thereby overcoming the limitations of large millimeter-wave transmission loss and difficult control of multiple frequency-conversion amplitude consistency in traditional microwave technology, being able to adapt to long-distance transmission and frequency conversion processing of wide dynamic and large-bandwidth millimeter-wave signals, solving the problems of a large number of receiving and processing channels, large volume and low real-time performance in traditional direction-finding methods, realizing high-precision direction-finding of a wide spatial domain and large-bandwidth millimeter-wave interferometer, and having good application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a flow chart of a millimeter wave direction finding method provided by an embodiment of the present invention;

[0023] Figure 2 A block diagram of the coherent photon frequency conversion principle of the millimeter wave direction finding method provided by an embodiment of the present invention;

[0024] Figure 3 A principle block diagram of a direction finding device for a millimeter wave direction finding method provided by an embodiment of the present invention;

[0025] Figure 4 This is a module block diagram of a millimeter wave direction finding device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] Figure 1 A schematic diagram of a flow chart of a millimeter wave direction finding method provided by an embodiment of the present invention.

[0028] like Figure 1 As shown, a millimeter wave direction finding method comprises the following steps:

[0029] S1: Obtaining a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements;

[0030] S2: importing a millimeter wave local oscillator signal and a plurality of antenna phase differences, and performing signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals;

[0031] S3: Calculate the phase difference of each digital signal respectively to obtain the original channel phase difference corresponding to each original millimeter wave signal;

[0032] S4: performing correction analysis on all the original channel phase differences according to all the antenna phase differences to obtain target channel phase differences corresponding to each of the original millimeter wave signals;

[0033] S5: Perform direction finding analysis on all the target channel phase differences to obtain millimeter wave direction finding results.

[0034] It should be understood that the millimeter wave signal (ie, the original millimeter wave signal) in the coverage space is received by 5 or more receiving antenna array elements placed according to a certain baseline length (which are mutually prime numbers).

[0035] In the above embodiment, a digital signal is obtained by analyzing the signal of the millimeter-wave local oscillator signal and the original millimeter-wave signal, the phase difference of the digital signal is calculated to obtain the original channel phase difference, the target channel phase difference is obtained by correcting and analyzing the original channel phase difference according to the antenna phase difference, and the direction finding result of the millimeter wave is obtained by direction finding analysis of the target channel phase difference. This overcomes the limitations of large millimeter-wave transmission loss and difficult control of phase consistency of multiple frequency conversions in traditional microwave technology, can adapt to long-distance transmission and frequency conversion processing of wide dynamic and large-bandwidth millimeter-wave signals, solves the problems of large number of receiving and processing channels, large volume and low real-time performance of traditional direction finding methods, realizes high-precision direction finding of wide spatial domain and large-bandwidth millimeter-wave interferometer, and has good application value.

[0036] Optionally, as an embodiment of the present invention, Figure 1 and 2 As shown, in S2, the process of performing signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals to obtain a digital signal corresponding to each of the original millimeter wave signals includes:

[0037] The millimeter wave local oscillator signal and each of the original millimeter wave signals are modulated by a polarization controller to obtain a modulated local oscillator signal corresponding to the millimeter wave local oscillator signal and a modulated millimeter wave signal corresponding to each of the original millimeter wave signals;

[0038] Performing signal enhancement processing on the modulated local oscillator signal and each of the modulated millimeter-wave signals respectively through a Mach-Zehnder interferometer to obtain an enhanced local oscillator signal corresponding to the millimeter-wave local oscillator signal and an enhanced millimeter-wave signal corresponding to each of the original millimeter-wave signals;

[0039] The enhanced local oscillator signal is coupled with each of the enhanced millimeter wave signals to obtain coupled millimeter wave signals corresponding to each of the original millimeter wave signals;

[0040] Converting each of the coupled millimeter wave signals into an original intermediate frequency signal corresponding to each of the original millimeter wave signals through a photoelectric detector;

[0041] Performing filtering processing on each of the original intermediate frequency signals through a low-pass electric filter to obtain a filtered intermediate frequency signal corresponding to each of the original millimeter wave signals;

[0042] Perform analog-to-digital conversion on each of the filtered intermediate frequency signals to obtain a digital signal corresponding to each of the original millimeter wave signals.

[0043] Specifically, through the design of microwave photonic frequency conversion links, the broadband characteristics of optical fiber communication are applied to millimeter wave signal transmission and frequency conversion processing, the broadband microwave signal is converted into a narrowband light wave signal, and the signal is frequency converted in the optical domain, overcoming the limitations of multiple frequency conversions in traditional millimeter wave technology, and realizing high-fidelity transmission and frequency conversion processing of wide dynamic, large-bandwidth millimeter wave signals.

[0044] It should be understood that, through high-speed ADC sampling processing, the microwave intermediate frequency signal (ie, the filtered intermediate frequency signal) is converted into a digital signal for signal processing.

[0045] Specifically, the optical carrier F output by the laser is divided into two paths through the optical network. One path is sent to the Mach-Zehnder interferometer (MZM1) through the polarization controller, and the millimeter-wave signal RF to be frequency-converted (i.e., the original millimeter-wave signal) is loaded onto the optical carrier by utilizing the electro-optical modulation conversion effect; the other path is sent to the Mach-Zehnder interferometer (MZM2) through the polarization controller, and the millimeter-wave local oscillator signal LO (i.e., the millimeter-wave local oscillator signal) is loaded onto the optical carrier by utilizing the electro-optical modulation conversion effect, and then injected into the semiconductor amplifier (SOA) to realize multi-mode optical local oscillator generation.

[0046] It should be understood that the multi-mode optical local oscillator signal LO (i.e., the enhanced local oscillator signal) is coupled with the radio frequency optical signal RF to be converted (i.e., the enhanced millimeter wave signal), mixed in the optical domain, and the photoelectric modulation conversion effect is used to complete the photoelectric conversion of the coupled optical signal (i.e., the coupled millimeter wave signal) into an intermediate frequency signal (i.e., the original intermediate frequency signal) through a photodetector.

[0047] It should be understood that the down-converted intermediate frequency signal (ie, the original intermediate frequency signal) is filtered and extracted using a low-pass electric filter to achieve coherent photon down-conversion output of the optically-carried millimeter-wave signal.

[0048] Specifically, a polarization controller is a device used to control the polarization state of light, and is widely used in fields such as fiber-optic communications, fiber-optic sensing, and fiber-optic lasers. It adjusts the propagation characteristics of light in the optical fiber by changing the physical structure of the optical fiber or applying external stress, thereby achieving precise control of the polarization state of light. The working principle of the polarization controller is mainly based on the polarization effect of light. When light passes through a certain medium, the direction of its electric field changes, a phenomenon called polarization.

[0049] It should be understood that the Mach-Zehnder interferometer can control the optical path length by adjusting the elements in the optical path (such as a reflector or a beam splitter) to accurately measure the phase change. The advantage of this interferometer is that it separates the detection optical path from the reference optical path, avoiding interference between the two in structure, thus enabling high-precision sensing.

[0050] Specifically, a photodetector is a sensor that converts light signals into electrical signals and is widely used in various scientific and technological fields. Its working principle is based on the photoelectric effect, that is, when light shines on the photodetector, the energy of the photon excites the electrons in the semiconductor material, thereby generating current. The basic working mechanism of the photodetector includes three processes: the generation of photogenerated carriers, the diffusion or drift of carriers to form current, and the amplification of the photocurrent in the amplifier circuit and conversion into a voltage signal.

[0051] It should be understood that a low-pass filter (LPF) is an electronic circuit whose main function is to allow low-frequency signals to pass through while suppressing signals above a certain cut-off frequency. The working principle of a low-pass filter is based on the characteristics of capacitors and inductors: capacitors can pass high-frequency signals and block low-frequency signals, while inductors pass low-frequency signals and block high-frequency signals. Therefore, a low-pass filter is usually composed of resistors, capacitors or inductors, which can allow signals below a certain cut-off frequency to pass without attenuation, while suppressing signals above the cut-off frequency.

[0052] In the above embodiment, the millimeter wave local oscillator signal and the original millimeter wave signal are respectively analyzed to obtain a digital signal, which overcomes the limitations of multiple frequency conversions in traditional millimeter wave technology and realizes high-fidelity transmission and frequency conversion processing of wide dynamic and large bandwidth millimeter wave signals.

[0053] Optionally, as an embodiment of the present invention, the process of S3 includes:

[0054] The phase difference of each digital signal is calculated by using a CORD IC coordinate rotation digital computer algorithm to obtain the original channel phase difference corresponding to each original millimeter wave signal.

[0055] It should be understood that the phase difference measurement is performed on the received signal (ie, digital signal) of the multi-baseline interferometer antenna array element.

[0056] Specifically, the CORDIC (Coordinate Rotation Digital Computer) algorithm is an iterative method for calculating a variety of mathematical functions, which recursively calculates function values ​​such as sine, cosine, hyperbolic sine, hyperbolic cosine, etc. through simple shift and addition and subtraction operations. This algorithm was first proposed by J. Volder in 1959 and further developed into a unified iterative equation form by J. Walther in 1971.

[0057] In the above embodiment, the CORD IC coordinate rotation digital computer algorithm is used to calculate the phase difference of the digital signal to obtain the original channel phase difference, which solves the problems of the large number of receiving and processing channels, large volume and low real-time performance of the traditional direction finding method, and realizes the high-precision direction finding of the wide spatial domain and large bandwidth millimeter wave interferometer, which has great application value.

[0058] Optionally, as an embodiment of the present invention, the process of S4 includes:

[0059] S41: performing down-conversion processing on each of the original channel phase differences respectively to obtain a converted channel phase difference corresponding to each of the original millimeter wave signals;

[0060] S42: Determine whether all the frequency-converted channel phase differences are less than the first preset value, and whether all the antenna phase differences are less than the second preset value; if not, return to S1; if yes, execute S43;

[0061] S43: constructing a channel phase difference correction table through all the frequency-converted channel phase differences, and constructing an antenna phase difference correction table through all the antenna phase differences;

[0062] S44: Correct each of the original channel phase differences according to the channel phase difference correction table and the antenna phase difference correction table to obtain a target channel phase difference corresponding to each of the original millimeter wave signals.

[0063] It should be understood that considering that millimeter wave photonic links are easily affected by factors such as the external environment, the performance of optical transmitters and optical receivers, and thus the phase difference of millimeter wave signals changes after electro-optical conversion, photonic frequency conversion, and optoelectronic conversion, it is necessary to correct the phase difference inconsistency of the equipment from a global system perspective.

[0064] Specifically, the microwave photon frequency conversion module is controlled to perform single-pole double-throw switch switching, and the signal of the built-in correction source module is switched to the coherent photon frequency conversion channel for down-conversion processing; the receiving channel phase difference value corresponding to each baseline (i.e., the channel phase difference after frequency conversion) is measured and recorded, and a real-time receiving channel phase difference correction table is established.

[0065] It should be understood that the antenna phase difference values ​​at each baseline normal position of the millimeter wave interferometer are measured and recorded to establish a default antenna phase difference correction table.

[0066] Specifically, the environmental condition changes are monitored in real time, the phase difference inconsistency of each receiving channel relative to the reference channel is measured, and the phase difference inconsistency caused by the environmental condition changes can be compensated manually or automatically.

[0067] In the above embodiment, all original channel phase differences are corrected and analyzed according to all antenna phase differences to obtain the target channel phase difference, which solves the problems of large number of receiving and processing channels, large volume and low real-time performance of the traditional direction finding method, realizes high-precision direction finding of wide spatial domain and large bandwidth millimeter wave interferometer, and has good application value.

[0068] Optionally, as an embodiment of the present invention, the process of S5 includes:

[0069] Performing deambiguation calculations on the phase differences of each target channel respectively to obtain original interferometer coarse direction finding values ​​corresponding to each original millimeter wave signal;

[0070] When the original interferometer coarse direction finding value is within a preset threshold range, the original interferometer coarse direction finding value is used as the target interferometer coarse direction finding value, thereby obtaining multiple target interferometer coarse direction finding values, and all the target interferometer coarse direction finding values ​​are used as millimeter wave direction finding results.

[0071] It should be understood that multi-baseline interferometer direction finding is performed on millimeter wave signals. Considering that there is always a certain error in the measurement results of multi-baseline phase difference, a method of direction finding filtering based on approximation interactive multi-model is used to eliminate the phenomenon that the baseline phase difference error is large at certain frequency points and specific incident angles, causing abnormal direction finding results, so that high-precision direction finding of wide spatial domain and large bandwidth millimeter wave interferometer can be achieved.

[0072] Specifically, according to the signal measurement frequency and the multi-baseline phase difference, the phase difference value in the multi-baseline antenna phase difference correction value table corresponding to the normal direction is searched to obtain the baseline phase difference value (i.e., the target channel phase difference) after compensation for the target signal received by each antenna, and according to the antenna phase difference value (i.e., the target channel phase difference) after the correction and compensation corresponding to the multiple baselines, a defuzzification calculation is performed, and the interferometer coarse direction finding result (i.e., the original interferometer coarse direction finding value) is output. By using the multi-baseline phase difference information of the target based on the approximate interactive multi-model direction finding filtering method, the change or disappearance of the direction finding result is detected in real time, and the model conversion or state noise variance adjustment is performed according to the detection result to avoid the divergence of the direction finding filter, eliminate the abnormal value of the direction finding result, and output the interferometer precise direction finding result (i.e., the coarse direction finding value of all target interferometers).

[0073] In the above embodiment, the direction finding analysis is performed on the phase differences of all target channels to obtain the direction finding result of the millimeter wave, which avoids the divergence of the direction finding filter, eliminates the abnormal values ​​of the direction finding result, and eliminates the phenomenon that the baseline phase difference error is large at a specific incident angle at certain frequency points, causing abnormal direction finding results, thereby realizing high-precision direction finding of a wide spatial domain and large bandwidth millimeter wave interferometer.

[0074] Optionally, as another embodiment of the present invention, the present invention combines coherent photon frequency conversion technology and multi-baseline interferometer direction finding technology across fields, and overcomes the limitations of large millimeter wave transmission loss and difficult control of multiple frequency conversion amplitude consistency in traditional microwave technology by using a coherent photon frequency conversion link design based on parallel MZM, and adapts to the long-distance transmission and frequency conversion processing of wide dynamic and large-bandwidth millimeter wave signals; adopts a multi-baseline interferometer direction finding method to solve the problems of large number of receiving and processing channels, large volume and low real-time performance corresponding to the millimeter wave amplitude difference method and array beam synthesis method direction finding; adopts an approximate interactive multi-model direction finding filtering method to eliminate the phenomenon that the baseline phase difference error is large at certain frequency points and specific incident angles, causing abnormal direction finding results, and realizes high-precision direction finding of wide spatial domain and large bandwidth millimeter wave interferometer. Under the same direction finding performance requirements, the millimeter wave direction finding method of photon frequency conversion combined with multi-baseline interferometer has few receiving and processing channels, small volume and high real-time performance, and has good application value.

[0075] Optionally, as another embodiment of the present invention, microwave signals are converted into photon signals through optical technology, and the coherent photon frequency conversion technology and multi-baseline interferometer direction finding technology are combined across fields by utilizing the characteristics of high stability, low loss and strong anti-electromagnetic interference ability of photon communication. By using a coherent photon frequency conversion link design based on parallel MZM, the limitations of large millimeter wave transmission loss and difficult control of multiple frequency conversion amplitude consistency in traditional microwave technology are overcome, and wide dynamic and large bandwidth millimeter wave signal high-fidelity transmission and frequency conversion processing are adapted; a multi-baseline interferometer direction finding method is adopted and the phase difference consistency correction and compensation problem between multiple millimeter wave antennas is considered from the overall system perspective to solve the problems of large number, large volume and low real-time performance of receiving and processing channels corresponding to millimeter wave amplitude difference method and array beam synthesis method direction finding; an approximate interactive multi-model direction finding filtering method is adopted to eliminate the phenomenon that the baseline phase difference error is large at certain frequency points and specific incident angles, causing abnormal direction finding results, and realize high-precision direction finding of wide spatial domain and large bandwidth millimeter wave interferometer. While meeting the same direction-finding performance requirements, the millimeter-wave direction-finding method of photon frequency conversion combined with multi-baseline interferometer has fewer receiving and processing channels, a small size, and high real-time performance, and has good economic value and application prospects.

[0076] Optionally, as another embodiment of the present invention, Figure 3As shown, the working principle of the millimeter wave direction finding of the present invention (taking a 5-antenna four-baseline interferometer as an example) mainly includes a receiving antenna array, a microwave photon frequency conversion module and a frequency measurement and direction finding integrated module. The receiving antenna array completes the detection of the radar radiation source signal of the corresponding frequency band within the instantaneous coverage airspace; the microwave photon frequency conversion module switches through a single-pole double-throw switch, and can send the 5-way receiving antenna radar radiation source signal to 5 coherent photon frequency conversion channels for down-conversion processing after amplification and filtering; the built-in correction source module can also be used to complete the equipment amplitude and phase consistency difference correction. The coherent photon frequency conversion channel down-converts and outputs 5 intermediate frequency signals to the frequency measurement and direction finding integrated module by reasonably setting the variable optical local oscillator combination control parameters. The frequency measurement and direction finding integrated module adopts multi-channel digital reception and parallel data processing technology to complete the acquisition of intermediate frequency signals and pulse parameter measurement, realize millimeter wave interferometer direction finding, and form a full pulse description word signal stream data to send to the subsequent signal processing software for direction finding result filtering and signal sorting.

[0077] Figure 4 A module block diagram of a millimeter wave direction finding device provided in an embodiment of the present invention.

[0078] Optionally, as another embodiment of the present invention, Figure 4 As shown, a millimeter wave direction finding device comprises:

[0079] A signal acquisition module, used to obtain a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements;

[0080] Import module, used to import millimeter wave local oscillator signals and multiple antenna phase differences;

[0081] A signal analysis module, used to perform signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals;

[0082] A phase difference calculation module, used to calculate the phase difference of each of the digital signals respectively, to obtain the original channel phase difference corresponding to each of the original millimeter wave signals;

[0083] A correction and analysis module, used to perform correction and analysis on all the original channel phase differences according to all the antenna phase differences, to obtain a target channel phase difference corresponding to each of the original millimeter wave signals;

[0084] The direction finding result acquisition module is used to perform direction finding analysis on all the target channel phase differences to obtain the millimeter wave direction finding result.

[0085] Optionally, as an embodiment of the present invention, the signal analysis module is specifically used for:

[0086] The millimeter wave local oscillator signal and each of the original millimeter wave signals are modulated by a polarization controller to obtain a modulated local oscillator signal corresponding to the millimeter wave local oscillator signal and a modulated millimeter wave signal corresponding to each of the original millimeter wave signals;

[0087] Performing signal enhancement processing on the modulated local oscillator signal and each of the modulated millimeter-wave signals respectively through a Mach-Zehnder interferometer to obtain an enhanced local oscillator signal corresponding to the millimeter-wave local oscillator signal and an enhanced millimeter-wave signal corresponding to each of the original millimeter-wave signals;

[0088] The enhanced local oscillator signal is coupled with each of the enhanced millimeter wave signals to obtain coupled millimeter wave signals corresponding to each of the original millimeter wave signals;

[0089] Converting each of the coupled millimeter wave signals into an original intermediate frequency signal corresponding to each of the original millimeter wave signals through a photoelectric detector;

[0090] Performing filtering processing on each of the original intermediate frequency signals through a low-pass electric filter to obtain a filtered intermediate frequency signal corresponding to each of the original millimeter wave signals;

[0091] Perform analog-to-digital conversion on each of the filtered intermediate frequency signals to obtain a digital signal corresponding to each of the original millimeter wave signals.

[0092] Optionally, as an embodiment of the present invention, the phase difference calculation module is specifically used to:

[0093] The phase difference of each digital signal is calculated by using a CORD IC coordinate rotation digital computer algorithm to obtain the original channel phase difference corresponding to each original millimeter wave signal.

[0094] Optionally, another embodiment of the present invention provides a millimeter wave direction finding system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the millimeter wave direction finding method as described above is implemented. The system may be a computer or other system.

[0095] Optionally, another embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the millimeter wave direction finding method as described above is implemented.

[0096] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0097] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0099] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present invention.

[0100] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0101] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A millimeter wave direction finding method, characterized in that: The steps include: S1: Obtaining a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements; S2: importing a millimeter wave local oscillator signal and a plurality of antenna phase differences, and performing signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals; S3: Calculate the phase difference of each digital signal respectively to obtain the original channel phase difference corresponding to each original millimeter wave signal; S4: performing correction analysis on all the original channel phase differences according to all the antenna phase differences to obtain target channel phase differences corresponding to each of the original millimeter wave signals; S5: Perform direction finding analysis on all the target channel phase differences to obtain millimeter wave direction finding results.

2. The millimeter wave direction finding method according to claim 1, characterized in that: In S2, the process of performing signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals to obtain a digital signal corresponding to each of the original millimeter wave signals includes: The millimeter wave local oscillator signal and each of the original millimeter wave signals are modulated by a polarization controller to obtain a modulated local oscillator signal corresponding to the millimeter wave local oscillator signal and a modulated millimeter wave signal corresponding to each of the original millimeter wave signals; Performing signal enhancement processing on the modulated local oscillator signal and each of the modulated millimeter-wave signals respectively through a Mach-Zehnder interferometer to obtain an enhanced local oscillator signal corresponding to the millimeter-wave local oscillator signal and an enhanced millimeter-wave signal corresponding to each of the original millimeter-wave signals; The enhanced local oscillator signal is coupled with each of the enhanced millimeter wave signals to obtain coupled millimeter wave signals corresponding to each of the original millimeter wave signals; Converting each of the coupled millimeter wave signals into an original intermediate frequency signal corresponding to each of the original millimeter wave signals through a photoelectric detector; Performing filtering processing on each of the original intermediate frequency signals through a low-pass electric filter to obtain a filtered intermediate frequency signal corresponding to each of the original millimeter wave signals; Perform analog-to-digital conversion on each of the filtered intermediate frequency signals to obtain a digital signal corresponding to each of the original millimeter wave signals.

3. The millimeter wave direction finding method according to claim 1, characterized in that: The S3 process includes: The phase difference of each digital signal is calculated by using the CORDIC coordinate rotation digital computer algorithm to obtain the original channel phase difference corresponding to each original millimeter wave signal.

4. The millimeter wave direction finding method according to claim 1, characterized in that: The S4 process includes: S41: performing down-conversion processing on each of the original channel phase differences respectively to obtain a converted channel phase difference corresponding to each of the original millimeter wave signals; S42: Determine whether all the frequency-converted channel phase differences are less than the first preset value, and whether all the antenna phase differences are less than the second preset value; if not, return to S1; if yes, execute S43; S43: constructing a channel phase difference correction table through all the frequency-converted channel phase differences, and constructing an antenna phase difference correction table through all the antenna phase differences; S44: Correct each of the original channel phase differences according to the channel phase difference correction table and the antenna phase difference correction table to obtain a target channel phase difference corresponding to each of the original millimeter wave signals.

5. The millimeter wave direction finding method according to claim 1, characterized in that: The S5 process includes: Performing deambiguation calculations on the phase differences of each target channel respectively to obtain original interferometer coarse direction finding values ​​corresponding to each original millimeter wave signal; When the original interferometer coarse direction finding value is within a preset threshold range, the original interferometer coarse direction finding value is used as the target interferometer coarse direction finding value, thereby obtaining multiple target interferometer coarse direction finding values, and all the target interferometer coarse direction finding values ​​are used as millimeter wave direction finding results.

6. A millimeter wave direction finding device, characterized in that: include: A signal acquisition module, used to obtain a plurality of original millimeter wave signals corresponding to each of the plurality of receiving antenna array elements from the plurality of receiving antenna array elements; Import module, used to import millimeter wave local oscillator signals and multiple antenna phase differences; A signal analysis module, used to perform signal analysis on the millimeter wave local oscillator signal and each of the original millimeter wave signals, to obtain a digital signal corresponding to each of the original millimeter wave signals; A phase difference calculation module, used to calculate the phase difference of each of the digital signals respectively, to obtain the original channel phase difference corresponding to each of the original millimeter wave signals; A correction and analysis module, used to perform correction and analysis on all the original channel phase differences according to all the antenna phase differences, to obtain a target channel phase difference corresponding to each of the original millimeter wave signals; The direction finding result acquisition module is used to perform direction finding analysis on all the target channel phase differences to obtain the millimeter wave direction finding result.

7. The millimeter wave direction finding device according to claim 6, characterized in that: The signal analysis module is specifically used for: The millimeter wave local oscillator signal and each of the original millimeter wave signals are modulated by a polarization controller to obtain a modulated local oscillator signal corresponding to the millimeter wave local oscillator signal and a modulated millimeter wave signal corresponding to each of the original millimeter wave signals; Performing signal enhancement processing on the modulated local oscillator signal and each of the modulated millimeter-wave signals respectively through a Mach-Zehnder interferometer to obtain an enhanced local oscillator signal corresponding to the millimeter-wave local oscillator signal and an enhanced millimeter-wave signal corresponding to each of the original millimeter-wave signals; The enhanced local oscillator signal is coupled with each of the enhanced millimeter wave signals to obtain coupled millimeter wave signals corresponding to each of the original millimeter wave signals; Converting each of the coupled millimeter wave signals into an original intermediate frequency signal corresponding to each of the original millimeter wave signals through a photoelectric detector; Performing filtering processing on each of the original intermediate frequency signals through a low-pass electric filter to obtain a filtered intermediate frequency signal corresponding to each of the original millimeter wave signals; Perform analog-to-digital conversion on each of the filtered intermediate frequency signals to obtain a digital signal corresponding to each of the original millimeter wave signals.

8. The millimeter wave direction finding device according to claim 6, characterized in that: The phase difference calculation module is specifically used for: The phase difference of each digital signal is calculated by using the CORDIC coordinate rotation digital computer algorithm to obtain the original channel phase difference corresponding to each original millimeter wave signal.

9. A millimeter wave direction finding system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the millimeter wave direction finding method according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the millimeter wave direction finding method according to any one of claims 1 to 5 is implemented.

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