All-optical integrated radar signal receiving method and device based on space-time-frequency processing

Abstract

The present application relates to the field of radar technology, and in particular to an all-optical integrated radar signal receiving method based on space-time-frequency processing, wherein the method comprises: receiving a radar echo signal reflected by a target to be measured; performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position to obtain a light-borne echo signal; performing space-time domain two-dimensional microwave signal processing on the light-borne echo signal in the optical domain, and then performing time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; obtaining a photocurrent based on the first signal, and analyzing the spectrum characteristics of the photocurrent to realize a preset beam pointing, and obtaining two-dimensional information of the target within the preset beam pointing angle area. Thus, the problem of excessive cascade loss of different microwave photonic functional devices and interference of false target components in multi-target scenarios in the existing radar receiving scheme is solved.

Description

Technical Field

[0001] The present application relates to the field of radar technology, and in particular to an all-optical integrated radar signal receiving method based on space-time-frequency processing. Background Art

[0002] Radar can obtain multi-dimensional information such as the distance, direction, speed, etc. from the target to the transmitter by emitting electromagnetic waves to the target and receiving its echo. It plays an indispensable role in both the civilian and military fields. With the complexity and changeability of the target's environment and the need for users to obtain more detailed information about the target, radar is also constantly developing in the direction of multi-function and high resolution. In actual application scenarios, the targets detected by radar are usually non-cooperative. Generally, their positions and numbers in space cannot be predicted. For the receiving end, it is often necessary to first conduct a full-scale search in the airspace by beam scanning. Phased array radars that control the phase of electromagnetic waves electronically can effectively make up for the deficiencies of mechanical radars in flexibility, volume, power consumption, etc., but they are only applicable to narrowband radar signals. After using beam scanning to search for a target in a certain airspace direction, it is necessary to further obtain the target's characteristic information. High-frequency and large-bandwidth radar signals help improve the resolution of the target in the distance dimension and direction dimension. However, due to the limitations of traditional electronic devices in sampling rate, isolation, electromagnetic interference, etc., high-resolution detection radars that obtain two-dimensional information of targets electronically cannot match the detection needs of the current development.

[0003] Photon signal processing technology based on microwave photonics can effectively alleviate the shortcomings of traditional electrical methods in receiving-end detection with its advantages of high frequency, broadband, and anti-electromagnetic interference. For example, the optical true delay network solves the beam squint problem introduced by the electrical phase shifter in the phased array radar. The optically controlled phased array radar constructed in this way can be applied to broadband radar waveforms, and the beam pointing does not shift due to frequency changes within the band. Optical de-skewing signal processing also solves the radar receiving end's demand for high-resolution target detection, achieving centimeter-level imaging resolution while taking into account the real-time nature of information acquisition.

[0004] However, most of the typical radar receivers based on microwave photonic devices have single functions. The incompatible spectral structure leads to the need for electro-optical relay conversion when different microwave photonic functional devices are cascaded, and the system loss will rise sharply. Some related technologies have proposed a new multifunctional broadband radar receiving method that integrates optical beamforming and optical de-skewing functions, avoiding the unnecessary losses introduced by multiple optoelectronic conversions. However, this method has not further considered the impact of the number of airspace targets on the receiver. When there is more than one target in the space, the echoes of different targets will cause false targets to appear due to the nonlinear effect of optoelectronic devices, interfering with the judgment of the real target.

[0005] From the above, we can see that in order to meet the diversified radar detection needs and adapt to the complex and changing environment, it is crucial to propose a radar signal receiving scheme that combines spatial beam scanning and high-resolution detection functions. It is of great significance to improve the performance of the radar receiver system while eliminating unnecessary photoelectric conversion losses and effectively avoiding the interference of false target components. Summary of the invention

[0006] The present application provides an all-optical integrated radar signal receiving method based on space-time-frequency processing to solve the problems of excessive cascade loss of different microwave photonic functional devices and interference of false target components in multi-target scenarios in existing radar receiving solutions.

[0007] The first aspect of the present application provides an all-optical integrated radar signal receiving method based on space-time-frequency processing, comprising the following steps:

[0008] Receive the radar echo signal reflected by the target to be measured;

[0009] After performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position, a light-carrying echo signal is obtained;

[0010] Performing space-time two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then performing time-frequency two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; and

[0011] A photocurrent is obtained according to the first signal, and a frequency spectrum feature of the photocurrent is analyzed to realize a preset beam pointing, and two-dimensional information of a target within a preset beam pointing angle area is obtained.

[0012] Optionally, performing space-time domain two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then performing time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate the first signal includes:

[0013] Performing space-time two-dimensional microwave signal processing on the optical echo signal in the optical domain, adjusting the beam pointing to the preset beam pointing, and obtaining an optical signal;

[0014] The optical signal is subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to obtain the first signal.

[0015] Optionally, obtaining a photocurrent according to the first signal, analyzing a spectrum feature of the photocurrent to achieve a preset beam pointing, and obtaining two-dimensional information of a target within a preset beam pointing angle region includes:

[0016] The first signal is subjected to photoelectric conversion to obtain a photocurrent, and the spectrum characteristics of the photocurrent are analyzed to achieve a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

[0017] Optionally, before receiving the radar echo signal reflected by the target to be measured, the method further includes:

[0018] Transmits a linear frequency modulated wave into the airspace.

[0019] The second aspect of the present application provides an all-optical integrated radar signal receiving device, including:

[0020] A receiving module, used for receiving the radar echo signal reflected by the target to be measured;

[0021] a first signal processing module, configured to obtain a light-carrying echo signal after performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position,

[0022] A second signal processing module, configured to perform space-time domain two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then perform time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; and

[0023] The analysis module is used to obtain a photocurrent according to the first signal, analyze the spectrum characteristics of the photocurrent to realize the preset beam pointing, and obtain two-dimensional information of the target within the preset beam pointing angle area.

[0024] Optionally, the second signal processing module is specifically configured to:

[0025] Performing space-time two-dimensional microwave signal processing on the optical echo signal in the optical domain, adjusting the beam pointing to the preset beam pointing, and obtaining an optical signal;

[0026] The optical signal is subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to obtain the first signal.

[0027] Optionally, the analysis module is specifically used to:

[0028] The first signal is subjected to photoelectric conversion to obtain a photocurrent, and the spectrum characteristics of the photocurrent are analyzed to achieve a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

[0029] Optionally, before receiving the radar echo signal reflected by the target to be measured, the method further includes:

[0030] The linear frequency modulation wave is transmitted into the airspace through the transmitting module.

[0031] Therefore, the all-optical integrated radar signal receiving method based on space-time-frequency processing in the embodiment of the present application has the following advantages:

[0032] In the optical domain, the two functions of optical beamforming and microwave photon high-resolution imaging are realized simultaneously, overcoming the spectral incompatibility of different microwave photon functional devices. The influence of false target factors in multi-target scenarios is eliminated through easy-to-implement unit bias point control. The wavelength division multiplexing technology reduces the device scale under multiple array elements, and completes the rapid data acquisition with a low-speed electrical ADC (Analog-to-Digital Converter). It can support beam scanning under large-scale phased arrays and high-resolution imaging without false target interference in the beam area, enriching the functions of traditional receivers. In this way, the problem of excessive cascade loss of different microwave photon functional devices and false target component interference in multi-target scenarios in existing radar receiving schemes is solved, and the contradiction between the number of array elements and the scale of receiver devices is alleviated, so that real-time and functionality are combined, which has great practical significance.

[0033] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A flowchart of an all-optical integrated radar signal receiving method based on space-time-frequency processing provided according to an embodiment of the present application;

[0036] Figure 2 This is an example diagram of an all-optical integrated radar signal receiving device based on space-time-frequency joint processing according to an embodiment of the present application;

[0037] Figure 3 This is a device diagram of an all-optical integrated radar receiving channel based on space-time-frequency joint processing according to an embodiment of the present application;

[0038] Figure 4 is a schematic diagram of detection results before and after false target component suppression in a dual-target scenario according to an embodiment of the present application;

[0039] Figure 5 This is an example diagram of an all-optical integrated radar signal receiving device based on space-time-frequency processing according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0041] The following describes the all-optical integrated radar signal receiving method based on space-time-frequency processing of the embodiment of the present application with reference to the accompanying drawings. In view of the problems of excessive cascade loss of different microwave photon functional devices and interference of false target components in multi-target scenarios in the existing radar receiving scheme mentioned in the above background technology, the present application provides an all-optical integrated radar signal receiving method based on space-time-frequency processing. In this method, by using photon-based space-time-frequency joint signal processing for the radar echo signal, the influence of false target components is eliminated by reasonable setting of bias points, and at the same time, wavelength division multiplexing technology is used to reduce the demand for the scale of receiver devices under multiple array elements, so that real-time and functionality are combined, and the problems of excessive cascade loss of different microwave photon functional devices and interference of false target components in multi-target scenarios in the existing radar receiving scheme are solved.

[0042] Specifically, Figure 1 A schematic flow chart of an all-optical integrated radar signal receiving method based on space-time-frequency processing provided in an embodiment of the present application.

[0043] like Figure 1 As shown, the all-optical integrated radar signal receiving method based on space-time-frequency processing includes the following steps:

[0044] In step S101, a radar echo signal reflected by a target to be detected is received.

[0045] Optionally, in some embodiments, before receiving the radar echo signal reflected by the target to be measured, the method further includes: transmitting a linear frequency modulation wave into the airspace.

[0046] Specifically, in the embodiment of the present application, a linear frequency modulation wave can be transmitted to the airspace through a transmitting end, and a receiving end can use a phased array antenna to receive a radar echo signal reflected by a target to be measured. The number of array elements of the phased array antenna can be N, and the expression of the linear frequency modulation wave is as follows:

[0047]

[0048] In step S102, the radar echo signal is electro-optically converted based on a first bias point set at a first preset position to obtain a light-borne echo signal.

[0049] In step S103, the optical echo signal is subjected to space-time domain two-dimensional microwave signal processing in the optical domain, and then subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal.

[0050] Optionally, the light-carrying echo signal is subjected to space-time domain two-dimensional microwave signal processing in the optical domain, and then subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal, including: performing space-time domain two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, adjusting the beam pointing to a preset beam pointing to obtain an optical signal; and performing time-frequency domain two-dimensional microwave signal processing on the optical signal based on the second bias point set at the second preset position to obtain the first signal.

[0051] Among them, the first preset position and the second preset position can both be positions preset by the user, can be positions obtained through a limited number of experiments, or can be positions obtained through a limited number of computer simulations, and are not specifically limited here. Preferably, the first preset position is the electro-optical conversion point, and the second preset position is a two-dimensional microwave signal in the time-frequency domain. The embodiment of the present application can stabilize the two-stage electro-optical modulator at the first bias point and the second bias point at the orthogonal bias point in turn, eliminating the false target interference component generated in the multi-target scenario in the beam area.

[0052] It should be understood that the embodiment of the present application can perform electro-optical conversion on the radar echo signal reflected by the target to be measured and received by each array element of the phased array antenna to obtain an optical echo signal, and perform space-time domain two-dimensional microwave signal processing on the optical echo signal in the optical domain to achieve beamforming, adjust the beam pointing of the receiving end to the preset beam pointing angle direction, achieve the preset beam pointing, obtain the optical signal, perform time-frequency domain two-dimensional microwave signal processing on the output optical signal, and bias the bias points of the two-stage electro-optical modulator at appropriate bias points in sequence, wherein the bias points of the two-stage electro-optical modulator can be set at the electro-optical conversion point and the time-frequency domain two-dimensional microwave signal processing point, thereby realizing the recognition of target detail information in the beam area, while reducing the back-end requirements for signal acquisition rate and storage depth, realizing all-optical integrated reception of the echo signal, and finally outputting the corresponding first signal.

[0053] In step S104, a photocurrent is obtained according to the first signal, and the spectrum characteristics of the photocurrent are analyzed to realize the preset beam pointing, and the two-dimensional information of the target within the preset beam pointing angle area is obtained.

[0054] Optionally, in some embodiments, a photocurrent is obtained based on the first signal, and the spectral characteristics of the photocurrent are analyzed to achieve a preset beam pointing, and two-dimensional information of a target within the preset beam pointing angle area is obtained, including: performing photoelectric conversion on the first signal to obtain a photocurrent, and analyzing the spectral characteristics of the photocurrent to achieve a preset beam pointing, and obtaining two-dimensional information of a target within the preset beam pointing angle area.

[0055] Specifically, the embodiment of the present application can perform photoelectric conversion on the first signal output in the above step S103 to obtain a photocurrent, analyze the spectral characteristics of the photocurrent, and use relevant algorithm processing to obtain the preset beam pointing and obtain the two-dimensional information of the target within the preset beam pointing angle area.

[0056] Therefore, by performing electro-optical conversion on the echo signal received by the phased array antenna, spatial beam scanning is realized by utilizing photon-based space-time two-dimensional microwave signal processing, and high-resolution detection of targets in the beam area is further realized by utilizing photon-based time-frequency two-dimensional microwave signal processing. By stabilizing the two-stage electro-optical modulators in the electro-optical conversion and time-frequency domain signal processing at orthogonal bias points in turn, the false target interference components generated in the multi-target scenario in the beam area are eliminated, and real-time beam scanning is finally realized after low-speed ADC sampling, so as to accurately identify the targets in the beam area.

[0057] In order to further understand the all-optical integrated radar signal receiving method of the embodiment of the present application, it is described in detail below in conjunction with specific embodiments.

[0058] like Figure 2 As shown, Figure 2 This is a schematic diagram of the principle of an all-optical integrated radar signal receiving system based on space-time-frequency joint processing. The receiving system includes: a phased array antenna, a multi-channel light source, an electro-optical conversion module, a first bias point control module, a space-time-frequency joint photon signal processing module, a second bias point control module, an optoelectronic conversion module and a signal processing module.

[0059] Specifically, the embodiment of the present application can transmit a linear frequency modulation signal to the airspace, and the radar echo signal is received by the phased array antenna at the receiving end, and the phased array antenna with N array elements sends the linear frequency modulation echo reflected by the target to the electrical signal input port of the electro-optical conversion module;

[0060] The multi-channel light source can generate N incoherent optical signals to provide optical carriers for the electrical-optical conversion of radar echo signals.

[0061] The electro-optical conversion module uses an electro-optical modulator to convert the N echo signals from the electrical domain to the optical domain in turn, and sends the optical echo signals to the space-time-frequency joint photon signal processing module;

[0062] The space-time-frequency joint photon signal processing module first realizes beamforming through space-time domain two-dimensional photon signal processing, adjusts the beam pointing of the receiving end to the preset beam pointing angle direction, and further uses time-frequency domain two-dimensional photon signal processing to realize the recognition of target detail information in the beam area, while reducing the back-end's requirements for signal acquisition rate and storage depth, and realizing all-optical integrated reception of echo signals;

[0063] The photoelectric conversion module converts the light-carrying echo signal after space-time-frequency joint signal processing from the optical domain to the electrical domain to obtain the output photocurrent.

[0064] The first bias point control module and the second bias point control module are respectively used to stabilize the two-stage electro-optical modulator of the electro-optical conversion module and the space-time-frequency joint photon signal processing module at orthogonal bias points in sequence, so as to eliminate the false target interference component generated in the multi-target scenario in the beam area;

[0065] The signal processing module realizes the preset beam pointing by analyzing the spectral characteristics of the photocurrent, and obtains the distance dimension and direction dimension information of the real target within the preset beam pointing angle area, thereby achieving high-resolution detection.

[0066] It should be noted that, in the embodiments of the present application, when performing space-time domain two-dimensional microwave signal processing and time-frequency domain two-dimensional microwave signal processing, an integrated module can be used, such as performing space-time domain two-dimensional microwave signal processing through a space-time-frequency combined photon signal processing module, and then performing time-frequency domain two-dimensional microwave signal processing. Separate modules can also be used, such as a space-time domain two-dimensional photon signal processing module for space-time domain two-dimensional microwave signal processing, and a time-frequency domain two-dimensional photon signal processing module for time-frequency domain two-dimensional microwave signal processing.

[0067] Furthermore, based on the above-mentioned all-optical integrated radar signal receiving system based on space-time-frequency joint processing, as Figure 3 As shown, an embodiment of the present application proposes an all-optical integrated radar signal receiving device based on space-time-frequency joint processing, the device comprising: a receiving antenna unit, a multi-channel light source unit, an electro-optical modulator array, a space-time domain two-dimensional photon signal processing unit, a time-frequency domain two-dimensional photon signal processing unit, a first bias point control unit, a second bias point control unit, a photoelectric detector, and a signal processing unit.

[0068] Specifically, the receiving antenna unit is used to receive linear frequency modulation echo signals, which can be realized by a phased array antenna or N independent conventional antenna components, where N is a positive integer, which is the number of array elements of the receiving channel in the all-optical integrated radar signal receiving device, and the output end is connected to the microwave signal input end of the electro-optical modulator array.

[0069] The multi-channel light source is used to provide N incoherent single-frequency optical carriers, which can be realized by N independent tunable lasers or optical frequency combs and waveform controllers, and the output end is connected to the optical signal input end of the electro-optic modulator array.

[0070] The electro-optic modulator array includes N electro-optic modulators, in which the conversion of high-speed broadband linear frequency modulation signals from the electrical domain to the optical domain is completed, and the rate of the modulator in each branch is greater than the rate of the linear frequency modulation signal.

[0071] The space-time domain two-dimensional photon signal processing unit includes N branches. The space-time mapping relationship of different array elements is constructed according to the actual spatial position of each array element and the preset beam pointing angle. The space-time two-dimensional signal processing is used to realize the beam pointing in the spatial domain of the receiving end. The output end is connected to the optical signal input end of the time-frequency domain two-dimensional photon signal processing unit.

[0072] The time-frequency domain two-dimensional photon signal processing unit includes a first-level electro-optical modulator, which is used to further perform time-frequency two-dimensional signal processing on the light-carrying echo signal to reduce the rate and bandwidth of the echo signal, and the output end is connected to the optical signal input end of the photodetector.

[0073] The first bias point control unit and the second bias point control unit are respectively used to stabilize the bias points of the electro-optic modulators in the electro-optic modulator array and the time-frequency domain two-dimensional photon signal processing unit. The two-stage electro-optic modulators are both set at the orthogonal bias points of the corresponding modulators, and the bias points are fixed to avoid interference of false target components on real targets in multi-target scenarios within the beam area.

[0074] The photodetector is used to convert the optical signal into a photocurrent, and the output end is connected to the microwave signal input end of the signal processing unit.

[0075] The signal processing unit is used to analyze the spectrum characteristics of the photocurrent, realize the preset beam pointing according to its spectrum information analysis, and obtain the distance dimension information and direction dimension information of the target within the preset beam pointing angle area, so as to realize the accurate identification of the real target.

[0076] Furthermore, if Figure 4 As shown, taking the received echo signal as a 18-26GHz K-band linear frequency modulation signal as an example, the pulse width is 100μs and the bandwidth is 8GHz. Figure 4 Schematic diagram of detection results before and after false target component suppression in a dual-target scenario, where: Figure 4 (b) Figure 4 (a) is an enlarged schematic diagram of the P position. The two-stage electro-optical modulators at the electro-optical conversion and time-frequency domain signal processing are set at orthogonal bias points, respectively, which has a suppression effect on the false target interference component generated by the beat frequency between real targets, and the suppression ratio reaches 47.64dB.

[0077] According to the all-optical integrated radar signal receiving method based on space-time-frequency processing proposed in the embodiment of the present application, by adopting photon-based space-time-frequency joint signal processing for the radar echo signal, the influence of false target components is eliminated by reasonable setting of bias points, and at the same time, wavelength division multiplexing technology is used to reduce the demand for the scale of receiver devices under multiple array elements, so that real-time and functionality are combined, and the problems of excessive cascade loss of different microwave photonic functional devices and interference of false target components in multi-target scenarios in existing radar receiving solutions are solved.

[0078] Next, an all-optical integrated radar signal receiving device based on space-time-frequency processing proposed according to an embodiment of the present application is described with reference to the accompanying drawings.

[0079] Figure 5 It is a block diagram of an all-optical integrated radar signal receiving device based on space-time-frequency processing according to an embodiment of the present application.

[0080] like Figure 5 As shown, the all-optical integrated radar signal receiving device 10 based on space-time-frequency processing includes: a receiving module 100, a first signal processing module 200, a second signal processing module 300 and an analysis module 400.

[0081] The receiving module 100 is used to receive the radar echo signal reflected by the target to be measured;

[0082] The first signal processing module 200 is used to obtain a light-carrying echo signal after performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position.

[0083] The second signal processing module 300 is used to perform space-time domain two-dimensional microwave signal processing on the optical echo signal in the optical domain, and then perform time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; and

[0084] The analysis module 400 is used to obtain a photocurrent according to the first signal, analyze the spectrum characteristics of the photocurrent to achieve a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

[0085] Optionally, in some embodiments, the second signal processing module 300 is specifically configured to:

[0086] Performing space-time two-dimensional microwave signal processing on the optical echo signal in the optical domain, adjusting the beam pointing to a preset beam pointing, and obtaining an optical signal;

[0087] The optical signal is subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to obtain a first signal.

[0088] Optionally, in some embodiments, the analysis module 400 is specifically used for:

[0089] The first signal is subjected to photoelectric conversion to obtain a photocurrent, and the spectrum characteristics of the photocurrent are analyzed to realize the preset beam pointing, and obtain the two-dimensional information of the target within the preset beam pointing angle area.

[0090] Optionally, in some embodiments, before receiving the radar echo signal reflected by the target to be measured, the method further includes: transmitting a linear frequency modulation wave to the airspace through a transmitting module.

[0091] It should be noted that the aforementioned explanation of the embodiment of the all-optical integrated radar signal receiving method based on space-time-frequency processing is also applicable to the all-optical integrated radar signal receiving device based on space-time-frequency processing in this embodiment, and will not be repeated here.

[0092] According to the all-optical integrated radar signal receiving device based on space-time-frequency processing proposed in the embodiment of the present application, by adopting photon-based space-time-frequency joint signal processing for the radar echo signal, the influence of false target components is eliminated by reasonable setting of bias points, and at the same time, wavelength division multiplexing technology is used to reduce the demand for the scale of receiver devices under multiple array elements, so that real-time and functionality are combined, and the problems of excessive cascade loss of different microwave photonic functional devices and interference of false target components in multi-target scenarios in existing radar receiving solutions are solved.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0094] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0095] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for receiving all-optical integrated radar signals based on space-time-frequency processing, characterized in that: include: Receive the radar echo signal reflected by the target to be measured; After performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position, a light-carrying echo signal is obtained; Performing space-time two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then performing time-frequency two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; as well as A photocurrent is obtained according to the first signal, and a frequency spectrum feature of the photocurrent is analyzed to realize a preset beam pointing, and two-dimensional information of a target within a preset beam pointing angle area is obtained.

2. The all-optical integrated radar signal receiving method based on space-time-frequency processing according to claim 1 is characterized in that: The step of performing space-time domain two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then performing time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal includes: Performing space-time two-dimensional microwave signal processing on the optical echo signal in the optical domain, adjusting the beam pointing to the preset beam pointing, and obtaining an optical signal; The optical signal is subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to obtain the first signal.

3. The all-optical integrated radar signal receiving method based on space-time-frequency processing according to claim 1 is characterized in that: The step of obtaining a photocurrent according to the first signal, analyzing a spectrum characteristic of the photocurrent to realize a preset beam pointing, and obtaining two-dimensional information of a target within a preset beam pointing angle region includes: The first signal is subjected to photoelectric conversion to obtain a photocurrent, and the spectrum characteristics of the photocurrent are analyzed to achieve a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

4. The all-optical integrated radar signal receiving method based on space-time-frequency processing according to claim 1 is characterized in that: Before receiving the radar echo signal reflected by the target to be measured, the method further includes: Transmits a linear frequency modulated wave into the airspace.

5. An all-optical integrated radar signal receiving device based on space-time-frequency processing, characterized in that: include: A receiving module, used for receiving the radar echo signal reflected by the target to be measured; a first signal processing module, configured to obtain a light-carrying echo signal after performing electro-optical conversion on the radar echo signal based on a first bias point set at a first preset position, A second signal processing module, configured to perform space-time domain two-dimensional microwave signal processing on the light-carrying echo signal in the optical domain, and then perform time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to generate a first signal; as well as The analysis module is used to obtain a photocurrent according to the first signal, analyze the spectrum characteristics of the photocurrent to realize a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

6. The all-optical integrated radar signal receiving device based on space-time-frequency processing according to claim 5, characterized in that: The second signal processing module is specifically used to: Performing space-time two-dimensional microwave signal processing on the optical echo signal in the optical domain, adjusting the beam pointing to the preset beam pointing, and obtaining an optical signal; The optical signal is subjected to time-frequency domain two-dimensional microwave signal processing based on a second bias point set at a second preset position to obtain the first signal.

7. The all-optical integrated radar signal receiving device based on space-time-frequency processing according to claim 5, characterized in that: The analysis module is specifically used for: The first signal is subjected to photoelectric conversion to obtain a photocurrent, and the spectrum characteristics of the photocurrent are analyzed to achieve a preset beam pointing, and obtain two-dimensional information of a target within a preset beam pointing angle area.

8. The all-optical integrated radar signal receiving device based on space-time-frequency processing according to claim 5, characterized in that: Before receiving the radar echo signal reflected by the target to be measured, the method further includes: The linear frequency modulation wave is transmitted into the airspace through the transmitting module.

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