High-precision rapid radar detection system and method and related products

Abstract

The invention discloses a high-precision fast radar detection system and method and related products, and relates to the technical field of microwave photonics, the system comprises a signal generation module, a signal emission module, a signal receiving module and a signal processing module, the signal generation module is used for outputting a target signal; the signal transmitting module is used for amplifying the target signal to obtain a target amplified signal, and transmitting the target amplified signal through a transmitting antenna; the signal receiving module is used for receiving a target broadband radio frequency electric signal, and the target broadband radio frequency electric signal is a signal transmitted back by a target amplification signal through multiple ways; and the signal processing module is used for processing the target broadband radio frequency electric signal to obtain a target processing signal. According to the invention, a large-bandwidth tunable signal can be generated, and windowing and matched filtering operation of a broadband electric radio frequency signal can be realized in an analog domain, so that rapid processing of an echo signal is realized.

Description

Technical Field

[0001] The present application relates to the field of microwave photonics technology, and in particular to a high-precision rapid radar detection system, method and related products. Background Art

[0002] The rapid development of unmanned flight technology and hypersonic technology has made the types of existing aircraft more diverse and their range of movement wider, posing increasingly severe challenges to homeland security and municipal security. Timely detection and identification of various aircraft will help to take effective countermeasures. Existing radar equipment based on electronic technology has bandwidth bottlenecks when facing the above needs, and the processing rate of broadband signals also faces bottlenecks.

[0003] As an emerging fusion discipline, microwave photonics has been widely used in the radar field due to its large bandwidth, low transmission loss, and anti-electromagnetic interference characteristics. In recent years, with the development of microwave photonics technology, some emerging microwave photonic technologies have also had new applications and developments in the radar field. Although the ultra-wideband radar system built using microwave photonic technology can achieve high-resolution imaging and recognition of flying targets, it is difficult to achieve real-time processing due to the huge amount of echo data.

[0004] Existing traditional radar equipment is limited by the performance of electronic devices. It is difficult to generate and process signals with a bandwidth of more than 1 GHz in the analog domain with high quality. For the increasingly complex electromagnetic environment, especially the large-scale application of small drones, traditional radars cannot meet the high-precision detection needs. Microwave photonic technology can generate large-bandwidth signals in the analog domain to meet this high-precision detection demand. In the receiving part, after the echo signal received by the antenna is modulated onto the optical carrier, the optical signal is received by superheterodyne / zero intermediate frequency. After the stray signal is filtered out by the optical filter, the demodulated electrical signal is restored by the optoelectronic conversion module, and then the intermediate frequency analog-to-digital conversion (ADC) is performed. This method is relatively simple and direct, but the large-bandwidth signals generated by microwave photonic technology in the analog domain are usually digitized and processed offline after transmission and reception, which will generate a large amount of calculation in the digital domain and is difficult to achieve fast processing.

[0005] Therefore, it is necessary to propose a high-precision and fast radar detection system to solve the above problems. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention section, which will be further described in detail in the Detailed Description of the Invention section. The Summary of the Invention section of this application does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] This application specifically includes the following aspects:

[0008] In a first aspect, the present application proposes a high-precision rapid radar detection system, including a signal generating module, a signal transmitting module, a signal receiving module and a signal processing module, wherein:

[0009] The signal generating module is used to output a target signal, wherein the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics;

[0010] The signal transmitting module is used to amplify the target signal to obtain a target amplified signal, and transmit the target amplified signal through a transmitting antenna;

[0011] The signal receiving module is used to receive a target broadband radio frequency electrical signal, where the target broadband radio frequency electrical signal is a signal transmitted back by the target amplified signal through multiple paths;

[0012] The signal processing module is used to process the target broadband radio frequency electrical signal to obtain a target processed signal.

[0013] In a feasible implementation manner, the signal generating module includes:

[0014] A single-frequency continuous laser for generating a target optical carrier;

[0015] A first microwave signal source, used to generate a target single-frequency signal;

[0016] A first phase modulator, used for modulating the target single-frequency signal onto the target optical carrier to obtain a first modulated optical signal;

[0017] A first tunable optical filter, configured to filter the first modulated optical signal to obtain two optical sideband signals;

[0018] A second microwave signal source, used to generate a target linear frequency modulation signal;

[0019] A second phase modulator, used for modulating the target linear frequency modulation signal onto the two optical sideband signals to obtain a second modulated optical signal;

[0020] a second tunable optical filter, configured to filter the two optical sideband signals to obtain a target optical sideband signal based on the second modulated optical signal;

[0021] The first photoelectric detector is used to perform photoelectric conversion on the target optical sideband signal to obtain the target signal and output it.

[0022] In a feasible implementation manner, the target optical carrier, the target single-frequency signal, the first modulated optical signal, the optical sideband signal, the linear frequency modulation signal, the second modulated optical signal, the target optical sideband signal and the target signal are respectively obtained by filtering based on different preset frequencies or preset bandwidths.

[0023] In a feasible implementation manner, the signal processing module includes:

[0024] an intensity modulator, configured to modulate the target broadband radio frequency electrical signal onto the target optical carrier to obtain a third modulated signal;

[0025] A dispersion control module, used to adjust the dispersion of the third modulated signal, control the power attenuation of the third modulated signal, and obtain a windowed signal;

[0026] a second photodetector, used to convert the windowed signal into a target electrical signal;

[0027] The surface acoustic wave filter is used to perform frequency band matching on the target electrical signal so that the target electrical signal is subjected to matched filtering processing in the analog domain to obtain the target processed signal.

[0028] In a feasible implementation manner, a terminal display module is also included, wherein:

[0029] The terminal display module is used to display the data content contained in the received target processed signal to the user through the display terminal.

[0030] In a feasible implementation manner, the target amplified signal is expressed as the following formula:

[0031] V(t)=V RF cos(2πf3t+πKt 2 );

[0032] Where, V(t) is the target amplified signal; V RF is the amplitude of the generated RF signal; f3=2|Nf1-Mf2| is the center frequency of the signal, f1 and f2 are the center frequencies, N and M are the orders of the optical sidebands, and are all integers; t is the time; K=2MB2 / T2 is the chirp rate of the signal, 2MB2 is the bandwidth of the signal, and T2 is the signal pulse duration.

[0033] In a feasible implementation manner, the target broadband radio frequency electrical signal is expressed as follows:

[0034]

[0035] Wherein, V(t1) is the target broadband RF electrical signal; t is time; T2 is the signal pulse width; f3=2|Nf1-Mf2| is the center frequency of the signal, f1 and f2 are the center frequencies, N and M are the orders of the optical sidebands, and both are integers; τ1 and τ2 are the transmission delays of different targets, τ1=2(L1-v1t) / c, τ2=2(L2-v2t) / c, L1 and L2 are the initial radial distances of different targets relative to the radar, and v1 and v2 are the radial running speeds of different targets relative to the radar.

[0036] In a second aspect, the present application proposes a high-precision rapid radar detection method, which is applied to the high-precision rapid radar detection system described in any one of the above embodiments, including:

[0037] Outputting a target signal, wherein the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics;

[0038] amplifying the target signal to obtain a target amplified signal, and transmitting the target amplified signal through a transmitting antenna;

[0039] Receiving a target broadband radio frequency electrical signal, wherein the target broadband radio frequency electrical signal is a signal transmitted back by the target amplified signal through multiple paths;

[0040] The target broadband radio frequency electrical signal is processed to obtain a target processed signal.

[0041] In a third aspect, an electronic device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor is used to implement the steps of the high-precision and rapid radar detection method as described in any one of the above-mentioned first aspects when executing the computer program stored in the memory.

[0042] In a fourth aspect, the present application further proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the high-precision rapid radar detection method of any one of the first aspects.

[0043] In summary, the high-precision fast radar detection system proposed in this application can generate a wide bandwidth tunable signal, and can also implement windowing and matched filtering operations on broadband electrical and radio frequency signals in the analog domain to achieve rapid processing of echo signals, so as to achieve the resolution of multiple small targets and the identification of a single large target. This application effectively combines the advantages of broadband signal generation of microwave photonic technology, dispersion simulation windowing processing, and analog matched filtering of surface acoustic wave filters.

[0044] The high-precision rapid radar detection system proposed in this application, and other advantages, objectives and features of this application will be reflected in part through the following description, and in part will also be understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present specification. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0046] Figure 1 A schematic diagram of the functional modules of a high-precision rapid radar detection system provided in an embodiment of the present application;

[0047] Figure 2 A schematic diagram of the functional modules of a high-precision and fast radar detection system based on microwave photon technology provided in an embodiment of the present application;

[0048] Figure 3 A schematic diagram of the output result after passing through the first phase modulator and the filter provided in an embodiment of the present application;

[0049] Figure 4 A schematic diagram of the output result after passing through the second phase modulator and the filter provided in an embodiment of the present application;

[0050] Figure 5 A spectrum diagram of a linear frequency modulation signal with a bandwidth of 1 GHz generated by optical domain spectrum manipulation provided in an embodiment of the present application;

[0051] Figure 6 A schematic diagram of the results of simulated matched filtering of a signal after windowing with different dispersion amounts provided in an embodiment of the present application;

[0052] Figure 7 A schematic diagram of the results obtained after dispersion simulation windowing and simulated matched filtering are performed on two targets with a radial distance of 75 cm provided in an embodiment of the present application;

[0053] Figure 8 A schematic diagram of a high-precision rapid radar detection method provided in an embodiment of the present application;

[0054] Fig. 9 A schematic diagram of the structure of an electronic device for high-precision and rapid radar detection provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0056] 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 that there is 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 the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0057] The present application provides a high-precision and fast radar detection system, which utilizes microwave photon optical domain spectrum manipulation technology and optical domain frequency conversion technology to realize the transmission and reception processing of large-bandwidth radar signals in the analog domain, so that the radar system has better resolution and multiple working frequency bands, adapts to different detection needs, and improves detection accuracy; utilizes microwave photon dispersion technology to perform windowing processing on echo signals in the analog domain, and utilizes surface acoustic wave filters to perform matched filtering in the analog domain to realize fast processing of echo signals.

[0058] See also Figure 1 , is a functional module diagram of a high-precision rapid radar detection system provided in an embodiment of the present application, including a signal generating module 11, a signal transmitting module 12, a signal receiving module 13 and a signal processing module 14, wherein:

[0059] The signal generating module 11 is used to output a target signal, where the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics;

[0060] The signal transmitting module 12 is used to amplify the target signal to obtain a target amplified signal, and transmit the target amplified signal through a transmitting antenna;

[0061] The signal receiving module 13 is used to receive a target broadband radio frequency electrical signal, where the target broadband radio frequency electrical signal is a signal transmitted back by the target amplified signal through multiple paths;

[0062] The signal processing module 14 is used to process the target broadband radio frequency electrical signal to obtain a target processed signal.

[0063] In some examples, the signal generating module 11 includes:

[0064] A single-frequency continuous laser for generating a target optical carrier;

[0065] A first microwave signal source, used to generate a target single-frequency signal;

[0066] A first phase modulator, used for modulating the target single-frequency signal onto the target optical carrier to obtain a first modulated optical signal;

[0067] A first tunable optical filter, configured to filter the first modulated optical signal to obtain two optical sideband signals;

[0068] A second microwave signal source, used to generate a target linear frequency modulation signal;

[0069] A second phase modulator, used for modulating the target linear frequency modulation signal onto the two optical sideband signals to obtain a second modulated optical signal;

[0070] a second tunable optical filter, configured to filter the two optical sideband signals to obtain a target optical sideband signal based on the second modulated optical signal;

[0071] The first photoelectric detector is used to perform photoelectric conversion on the target optical sideband signal to obtain the target signal and output it.

[0072] For example, Figure 2 As shown, the output interface of the single-frequency continuous laser is connected to the optical input interface of the first phase modulator, the radio frequency input interface of the first phase modulator is connected to the output interface of the first microwave signal source, the output interface of the first phase modulator is connected to the input interface of the first tunable optical filter, the output interface of the first tunable optical filter is connected to the input interface of the second phase modulator, the input interface of the second phase modulator is connected to the output interface of the second microwave signal source, the output interface of the second tunable optical filter is connected to the input interface of the first photodetector, and the output of the first photodetector is connected to the transmitting antenna.

[0073] Furthermore, the single-frequency continuous laser generates a target optical carrier with a center frequency of f0, and the first microwave signal source generates a target single-frequency signal with a center frequency of f1, which is modulated onto the optical carrier through electro-optical conversion based on the first phase modulator. By using the first tunable optical filter, a required pair of optical sidebands is selected, and this pair of optical sidebands is used as the carrier of the second phase modulation. The second microwave signal source generates a target linear frequency modulation signal with a center frequency of f2 and a bandwidth of B2, which is modulated onto a pair of optical sidebands filtered out by the first tunable optical filter through electro-optical conversion based on the second phase modulator. By using the second tunable optical filter, target optical sideband signals with frequencies of f0+Nf1-Mf2 and f0-Nf1+Mf2 on both sides of the center frequency of f0 are selected. Subsequently, a target signal with a frequency of 2|Nf1-Mf2| can be generated by performing photoelectric conversion on it. This signal is used as a transmission signal, amplified, and then transmitted through a transmitting antenna.

[0074] For example, when there is no need to generate a broadband signal, the bandwidth of the single-frequency continuous laser can be adjusted to generate a small-bandwidth signal, and it can also be flexibly tuned to meet detection requirements according to different requirements of different scenarios.

[0075] Furthermore, the method of generating a broadband tunable broadband signal by manipulating the optical spectrum in the signal generating module is only one of the signal generating schemes in microwave photonics, and may also be other microwave photonics signal generating methods or even traditional electronic signal generating methods.

[0076] In some examples, the target optical carrier, the target single-frequency signal, the first modulated optical signal, the optical sideband signal, the linear frequency modulation signal, the second modulated optical signal, the target optical sideband signal, and the target signal are respectively obtained by filtering based on different preset frequencies or preset bandwidths.

[0077] Exemplarily, a single-frequency continuous laser generates a continuous light wave signal, which can be expressed as:

[0078] E in (t) = E o exp(j2πf0t)

[0079] Among them, E o and f0 are the amplitude and frequency of the incident light wave respectively; j is a mathematical symbol representing an imaginary number.

[0080] The first microwave signal source generates a target single-frequency signal with a center frequency of f1, which can be expressed as:

[0081]

[0082] Among them, V1 and f1 are the speed and amplitude of the target single-frequency signal respectively. is the initial phase of the signal. The signal phase modulates the incident light wave from the single-frequency continuous laser in the first phase modulator, and the first modulated optical signal output by the first phase modulator can be expressed as:

[0083]

[0084] in, is the modulation index of the signal, V π1 is the half-wave voltage of PM1, and t is the time. Using Bessel function expansion, we get:

[0085]

[0086] Among them, J n (β1) is the nth-order Bessel function of the first kind.

[0087] Then, the modulated light wave is sent to the first tunable optical filter, which is a tunable dual-bandpass optical filter for selecting a desired pair of optical sidebands, which serve as carriers for the second phase modulation. Figure 3 to Figure 4 For the optical domain spectrum operation part, the required high-order sidebands are selected by setting the operating mode of the phase modulator and the passband of the programmable filter. Figure 3 , assuming that the order of the selected optical sideband is N, the ±N-order optical sideband signals can be expressed as:

[0088]

[0089] Therefore, the optical signal output by the first tunable optical filter can be expressed as:

[0090] E OF1 (t) = E -N (t)+E N (t)

[0091] The second microwave signal source generates a target linear frequency modulation signal with a center frequency of f2 and a bandwidth of B2, which is modulated onto an optical carrier (frequency of f0±Nf1) by a second phase modulator. The target linear frequency modulation signal can be expressed as:

[0092] V2(t)=V2cos(2πf2t+πμt 2 )

[0093] Where V2 and f2 represent the amplitude and frequency of the linear frequency modulation signal respectively. If the period of the signal is T2 and the bandwidth is B2, then the tuning frequency

[0094] The optical sideband output by the first tunable optical filter is modulated by the linear frequency modulation signal generated by the second microwave signal source in the second phase modulator to generate two sets of optical sidebands around f0±Nf1. The optical signal output by the second phase modulator can be expressed as:

[0095]

[0096] in, is the modulation index of the signal, V π2 is the half-wave voltage of the second phase modulator. Using Bessel function expansion, we get:

[0097]

[0098] The modulated optical signal is sent to the second tunable optical filter, and the second tunable optical filter with the center frequency at f0 selects the target optical sideband signals with the frequencies f0+Nf1-Mf2 and f0-Nf1+Mf2 on both sides of the center frequency f0. N and M are both integers, representing the order of the optical sideband. Different signals can be generated by selecting optical sidebands of different orders according to needs. m represents j to the power of m, J m represents the m-th order Bessel function.

[0099] When Nf1-Mf2<0, Figure 4 As shown, the center frequencies of the two optical sidebands are f0+Nf1-Mf2 and f0-Nf1+Mf2, respectively, and the bandwidth is MB2. The optical signal output by the second tunable optical filter can be expressed as:

[0100]

[0101] The signal output by the second tunable optical filter is input to the first photodetector to complete the conversion from optical signal to electrical signal. After the photoelectric conversion by the first photodetector, a signal centered at 2|Nf1-Mf2| is generated, and its bandwidth is 2MB2.

[0102] Finally, after being amplified by a low-noise amplifier, the target amplified signal is transmitted through the transmitting antenna.

[0103] In some examples, the target amplified signal is expressed as follows:

[0104] V(t)=V RF cos(2πf3t+πKt 2 );

[0105] Among them, V( t ) is the target amplified signal; V RFis the amplitude of the generated RF signal; f3 = 2|Nf1-Mf2| is the center frequency of the signal, f1 and f2 are the center frequencies, N and M are the orders of the optical sidebands, and both are integers; t is time; K = 2MB2 / T2 is the chirp rate of the signal, 2MB2 is the bandwidth of the signal, and T2 is the pulse duration of the signal. Figure 5 , which is the spectrum diagram of the linear frequency modulation signal with a bandwidth of 1 GHz generated by optical domain spectrum manipulation. It can be seen that the flatness of the signal is relatively good.

[0106] In some examples, the signal processing module 14 includes:

[0107] an intensity modulator, configured to modulate the target broadband radio frequency electrical signal onto the target optical carrier to obtain a third modulated signal;

[0108] A dispersion control module, used to adjust the dispersion of the third modulated signal, control the power attenuation of the third modulated signal, and obtain a windowed signal;

[0109] a second photodetector, used to convert the windowed signal into a target electrical signal;

[0110] The surface acoustic wave filter is used to perform frequency band matching on the target electrical signal so that the target electrical signal is subjected to matched filtering processing in the analog domain to obtain the target processed signal.

[0111] Exemplarily, the target broadband RF electrical signal received by the receiving antenna is sent to the optical carrier signal input interface of the intensity modulator, which is connected to the output interface of the single-frequency continuous laser, the output interface of the intensity modulator is connected to the input interface of the dispersion control module, the output interface of the dispersion control module is connected to the input interface of the second photodetector, and the output interface of the second photodetector is connected to the input interface of the surface acoustic wave filter.

[0112] Furthermore, the target broadband RF electrical signal received by the receiving antenna is modulated onto the optical carrier generated by the single-frequency continuous laser through electro-optical conversion, and the dispersion of the optical waveguide is regulated by the dispersion control module to control the power attenuation of the optical signal, thereby achieving the effect of simulated windowing. The windowed signal is converted back into an electrical signal through optoelectronic conversion, and then passed through a frequency-band-matched surface acoustic wave filter to realize matched filtering processing of the signal in the analog domain, and then directly output to the display terminal.

[0113] For example, if only the phase change relationship of the signal is considered and the amplitude and envelope of the signal are ignored, for two targets at different distances, the target broadband RF electrical signal received by the radar can be expressed as follows.

[0114] In some examples, the target broadband RF electrical signal is expressed as follows:

[0115]

[0116] Among them, V(t1) is the target broadband RF electrical signal; t is time; T2 is the signal pulse width; f3 = 2|Nf1-Mf2| is the center frequency of the signal, f1 and f2 are the center frequencies, N and M are the orders of the optical sidebands, and they are all integers; τ1 and τ2 are the transmission delays of different targets, τ1 = 2(L1-v1t) / c, τ2 = 2(L2-v2t) / c, L1 and L2 are the initial radial distances of different targets relative to the radar, and v1 and v2 are the radial running speeds of different targets relative to the radar. Taking the orthogonally biased electro-optic modulator as an example, considering the small signal model, the signal output by the intensity modulator can be expressed as:

[0117]

[0118] Among them, rect() represents the rectangular function, J1 is the first-order Bessel function, is the modulation coefficient of the MZM (Mach-Zehnder Modulator), V π3 is the half-wave voltage of MZM.

[0119] The signal output by the intensity modulator is input to the dispersion control module, where it is affected by the dispersion effect. After photoelectric conversion by the photodetector, an RF signal with a windowing effect is generated, and its spectrum can be expressed as:

[0120]

[0121] Wherein, λ is the central wavelength of the optical carrier, D and L are the dispersion coefficient and length of the dispersion optical fiber built into the dispersion control module, c is the speed of light, and f is the frequency.

[0122] The output signal enters the surface acoustic wave filter for matched filtering. The frequency response function of the surface acoustic wave matched filter can be expressed as:

[0123]

[0124] Based on this function, the RF signal is subjected to frequency domain matched filtering. The spectrum and time domain waveform output after matched filtering can be expressed as:

[0125]

[0126] in, To conjugate S1, S1 is the spectrum of the RF signal after windowing, H(f) is the frequency response function, B is the signal bandwidth, erf(x) and erfi(x) are the error function and imaginary error function. Here, according to the above formula, the dispersion-induced power attenuation will be reflected in the height of the side lobes of the matched filter output waveform.

[0127] The visualization result of the above formula is as follows Figure 6 and Figure 7 As shown, observe the time domain waveform envelope. The peak point of the time domain waveform represents the arrival time of the radar echo. The distance between the radar and the target can be calculated through the time of the envelope peak, and the position of the target can be determined. Different targets can be distinguished by using the differences in the envelope main lobe height and peak time of different targets. For some larger targets, they can be preliminarily identified using the one-dimensional range image after analog matched filtering. The analog signal output by the surface acoustic wave filter can be sent directly to the display for display, or it can be electrically sampled and then digitally processed. Specifically, Figure 6 The results of simulated matched filtering of signals after windowing with different dispersion amounts. As the dispersion amount increases, the windowing effect of the signal becomes more and more obvious, and the sidelobe suppression effect becomes better and better. Figure 7 This is the result of dispersion simulation windowing and simulated matched filtering for two targets with a radial distance of 75 cm. It can be seen that the two targets are well resolved.

[0128] In summary, the present application generates a tunable broadband signal with good distance resolution. Through the dispersion module and the surface acoustic wave filter, the signal processing time is shortened by windowing and matching filtering in the analog domain, and rapid detection can be achieved. In addition, in order to increase the transmission signal power, a signal amplifier can be added to the above-mentioned signal generation and reception related links, which can be an optical signal amplifier or an electrical signal amplifier according to the added node.

[0129] In some examples, a terminal display module 15 is also included, wherein:

[0130] The terminal display module 15 is used to display the data content contained in the received target processed signal to the user through a display terminal.

[0131] Exemplarily, the output of the surface acoustic wave filter is directly connected to the display terminal of the analog signal, which can be a P-type display or a digital processing and display terminal after analog-to-digital conversion.

[0132] In summary, the high-precision fast radar detection system provided by the present application can generate a wide bandwidth tunable signal, and can also implement windowing and matched filtering operations on broadband electrical and radio frequency signals in the analog domain to achieve rapid processing of echo signals. At the same time, the present application combines the advantages of broadband signal generation of microwave photonic technology, dispersion simulation windowing processing, and analog matched filtering of surface acoustic wave filters.

[0133] It should be noted that the above examples are only the best examples and are not limitations on the implementation methods of the present application.

[0134] Furthermore, the present application also proposes a high-precision rapid radar detection method, which is applied to any of the above embodiments of the high-precision rapid radar detection system, as follows: Figure 8 As shown, it is a process diagram of a high-precision rapid radar detection method provided by the present application, including:

[0135] S110, outputting a target signal, wherein the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics.

[0136] S120: Amplify the target signal to obtain a target amplified signal, and transmit the target amplified signal through a transmitting antenna.

[0137] S130, receiving a target broadband radio frequency electrical signal, where the target broadband radio frequency electrical signal is a signal of the target amplified signal transmitted back through multiple paths.

[0138] S140: Process the target broadband radio frequency electrical signal to obtain a target processed signal.

[0139] like Fig. 9 As shown, an embodiment of the present application also provides an electronic device 300, including a processor 310, a memory 320, and a computer program 321 stored in the memory 320 and executable on the processor, and when the processor 310 executes the computer program 321, the steps of any one of the above-mentioned methods of high-precision rapid radar detection are implemented.

[0140] Since the electronic device introduced in this embodiment is a device used to implement a high-precision and rapid radar detection method in the embodiment of the present application, based on the method introduced in the embodiment of the present application, technical personnel in this field can understand the specific implementation mode of the electronic device of this embodiment and its various variations. Therefore, how the electronic device implements the method in the embodiment of the present application is not introduced in detail here. As long as the equipment used by technical personnel in this field to implement the method in the embodiment of the present application falls within the scope of protection of this application.

[0141] In the specific implementation process, when the computer program 321 is executed by the processor, it can achieve Figure 1Any implementation manner in the corresponding embodiments.

[0142] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0143] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0144] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0145] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0146] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0147] An embodiment of the present application also provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes a process of a high-precision and rapid radar detection method.

[0148] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integration. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state drive (SSD)), etc.

[0149] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0150] In the several embodiments provided in the present application, it should be understood that the disclosed devices, apparatuses 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. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0151] 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 solution of this embodiment.

[0152] In addition, each functional unit in each embodiment of the present application 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.

[0153] 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 application 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 to enable 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 various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0154] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0155] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0156] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A high-precision rapid radar detection system, characterized in that: It includes a signal generating module, a signal transmitting module, a signal receiving module and a signal processing module, wherein: The signal generating module is used to output a target signal, wherein the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics; The signal transmitting module is used to amplify the target signal to obtain a target amplified signal, and transmit the target amplified signal through a transmitting antenna; The signal receiving module is used to receive a target broadband radio frequency electrical signal, where the target broadband radio frequency electrical signal is a signal transmitted back by the target amplified signal through multiple paths; The signal processing module is used to process the target broadband radio frequency electrical signal to obtain a target processed signal.

2. The high-precision rapid radar detection system according to claim 1, characterized in that: The signal generating module comprises: A single-frequency continuous laser for generating a target optical carrier; A first microwave signal source, used to generate a target single-frequency signal; A first phase modulator, used for modulating the target single-frequency signal onto the target optical carrier to obtain a first modulated optical signal; A first tunable optical filter, configured to filter the first modulated optical signal to obtain two optical sideband signals; A second microwave signal source, used to generate a target linear frequency modulation signal; A second phase modulator, used for modulating the target linear frequency modulation signal onto the two optical sideband signals to obtain a second modulated optical signal; a second tunable optical filter, configured to filter the two optical sideband signals to obtain a target optical sideband signal based on the second modulated optical signal; The first photoelectric detector is used to perform photoelectric conversion on the target optical sideband signal to obtain the target signal and output it.

3. The high-precision rapid radar detection system according to claim 2, characterized in that: The target optical carrier, the target single frequency signal, the first modulated optical signal, the optical sideband signal, the linear frequency modulation signal, the second modulated optical signal, the target optical sideband signal and the target signal are respectively obtained by filtering based on different preset frequencies or preset bandwidths.

4. The high-precision rapid radar detection system according to claim 2, characterized in that: The signal processing module comprises: an intensity modulator, configured to modulate the target broadband radio frequency electrical signal onto the target optical carrier to obtain a third modulated signal; A dispersion control module, used to adjust the dispersion of the third modulated signal, control the power attenuation of the third modulated signal, and obtain a windowed signal; a second photodetector, used to convert the windowed signal into a target electrical signal; The surface acoustic wave filter is used to perform frequency band matching on the target electrical signal so that the target electrical signal is subjected to matched filtering processing in the analog domain to obtain the target processed signal.

5. The high-precision rapid radar detection system according to claim 1, characterized in that: It also includes a terminal display module, wherein: The terminal display module is used to display the data content contained in the received target processed signal to the user through the display terminal.

6. The high-precision rapid radar detection system according to claim 1, characterized in that: The target amplified signal is expressed as follows: V(t)=V RF cos(2πf3t+πKt 2 ); in, V( t ) Amplify the signal for the target; V RF is the amplitude of the generated RF signal; f 3=2|Nf1-Mf2| is the center frequency of the signal, f 1. f 2 is the center frequency, N and M are the orders of the optical sidebands, and both are integers; t For time; K＝2MB2 / T2 is the chirp rate of the signal, 2MB2 is the bandwidth of the signal, T2 is the signal pulse width.

7. The high-precision rapid radar detection system according to claim 1, characterized in that: The target broadband radio frequency electrical signal is expressed as follows: Wherein, V(t1) is the target broadband RF electrical signal; t For time; T 2 is the signal pulse width; f3=2|Nf1-Mf2| is the center frequency of the signal, f 1. f 2 is the center frequency, N and M are the orders of the optical sidebands, and both are integers; τ1 , τ2 The transmission delay for different targets, τ1 =2(L1-v1t) / c, τ2 =2(L2-v2t) / c, L 1. L 2 is the initial radial distance of different targets relative to the radar, v1 , v2 is the radial running speed of different targets relative to the radar.

8. A high-precision rapid radar detection method, applied to the high-precision rapid radar detection system according to any one of claims 1 to 7, characterized in that: include: Outputting a target signal, wherein the target signal is an electrical signal obtained after processing and containing preset frequency information and modulation characteristics; amplifying the target signal to obtain a target amplified signal, and transmitting the target amplified signal through a transmitting antenna; Receiving a target broadband radio frequency electrical signal, wherein the target broadband radio frequency electrical signal is a signal transmitted back by the target amplified signal through multiple paths; The target broadband radio frequency electrical signal is processed to obtain a target processed signal.

9. An electronic device, comprising: A memory and a processor, wherein the processor is used to implement the steps of the high-precision and fast radar detection method as claimed in claim 8 when executing the computer program stored in the memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the high-precision and fast radar detection method according to claim 8 are implemented.

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