Method for controlling radar system based on quantum entangled state photons and radar system

Abstract

The present application relates to a method for controlling a radar system (10) based on quantum entangled state photons, comprising: in a quantum radar mode of the radar system (10), adjusting an optical parameter of a generated entangled photon pair based on meteorological environment detection information, the optical parameter comprising a wavelength and / or a pulse frequency of the entangled photon pair (S1); dividing the generated entangled photons into detection photons and reference photons for emission, emitting the detection photons to a target detection area through a detection path, and emitting the reference photons through a reference path (S2); and detecting a motion parameter of the target object based on quantum interference characteristics of the received reflected photons reflected by the target object in the target detection area and the reference photons propagating through the reference path (S3). According to the invention, the radar signal attenuation in severe weather is effectively inhibited, the long-distance effective detection of the target object under the severe weather condition is realized, and the resolution of the radar is remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of quantum measurement, and in particular to a method for controlling a radar system based on quantum entangled photons, a radar system based on quantum entangled photons, a vehicle including a radar system according to the present application, and a computer program product for at least assisting in implementing the steps of the method described in the present application. Background Art

[0002] Traditional millimeter-wave radar relies on the transmission and reception of millimeter-wave signals to detect environmental information. Millimeter-wave signals are easily scattered and / or absorbed by raindrops, fog droplets, dust particles, snowflakes, hailstones, and other particles along the propagation path. This results in a low effective detection range—typically less than 50 meters—in adverse weather conditions such as heavy rain, dense fog, dust, heavy snow, and hailstones, as well as large target positioning errors—typically less than 5 cm, which in turn affects the safety of assisted driving functions. Therefore, there is room for improvement in the detection capabilities of current radar systems in adverse weather conditions. Summary of the Invention

[0003] The purpose of the present application is to provide a method for controlling a radar system based on quantum entangled photons, a radar system based on quantum entangled photons, a vehicle including a radar system according to the present application, and a computer program product, so as to at least partially solve the problems in the prior art.

[0004] According to a first aspect of the present application, a method for controlling a radar system based on quantum entangled photons is provided, the method may include:

[0005] - In the quantum radar mode of the radar system, adjusting the optical parameters of the generated entangled photon pairs based on the meteorological environment detection information, wherein the optical parameters include the wavelength and / or pulse frequency of the entangled photon pairs;

[0006] - Split the generated entangled photon pair into a detection photon and a reference photon for emission, wherein,

[0007] emitting the detection photons through a detection path to a target detection area, and emitting the reference photons through a reference path; and

[0008] - detecting the motion parameters of the target object based on quantum interference characteristics of the received reflected photons reflected by the target object in the target detection area and the reference photons propagated through the reference path.

[0009] The core concept of this application is to propose a ranging scheme based on the theory of quantum entanglement, dynamically optimize the wavelength and / or pulse frequency of the generated entangled photon pairs based on meteorological environment detection information, and use the correlation between the entangled photon pairs to accurately detect the motion parameters of the target object based on environmental information, thereby effectively suppressing the attenuation of radar signals in severe weather, realizing effective detection of targets at long distances (for example, 300 meters) under severe weather conditions, and significantly improving the resolution of the radar, especially effectively reducing the positioning error of the target object to, for example, less than 5 cm.

[0010] According to an optional embodiment of the present application, the meteorological environment detection information may include particulate matter parameters in the vehicle's driving environment, wherein the particulate matter parameters include, for example, particulate matter type, and / or particulate matter concentration, and / or particulate matter size, etc.

[0011] According to another optional embodiment of the present application, the higher the concentration of particulate matter in the driving environment of the vehicle, the larger the wavelength of the generated entangled photon pair is adjusted to be, and / or the higher the pulse frequency of the generated entangled photon pair is adjusted to be.

[0012] According to another optional embodiment of the present application, the types of particulate matter include, for example, water droplets, and / or dust particles, and / or snowflake particles, and / or hail particles, etc.

[0013] According to another optional embodiment of the present application, the wavelength of the generated entangled photon pair can be adjusted in such a way as to increase the deviation between the wavelength of the generated entangled photon pair and the size of the particle.

[0014] According to another optional embodiment of the present application, the received reflected photons and reference photons can be input into a balanced beam splitter to count the coincidence count rate of the photons and measure the flight time difference of the photons, wherein the coincidence count rate of the photons can be counted based on the number of times the photons are simultaneously detected at the two output ends of the balanced beam splitter.

[0015] According to another optional embodiment of the present application, the motion parameters of the detected target object can be calculated based on the coincidence counting rate and the flight time difference. The motion parameters of the detected target object include, for example, the distance information, and / or speed information, and / or azimuth information of the target object.

[0016] According to another optional embodiment of the present application, when photons are detected simultaneously at the two output ends of the balanced beam splitter, the distance of the target object can be calculated based on the measured difference in the flight time of the photons. Alternatively, the speed of the target object can also be calculated based on the rate of change of the detected distance of the target object over time.

[0017] According to another optional embodiment of the present application, detection photons and reference photons of multiple entangled photon pairs can be respectively emitted by signal transmitting units installed at different positions, and the azimuth angle of the target object can be calculated using the phase difference or flight time difference between the reflected photons and reference photons of each received entangled photon pair.

[0018] According to another optional embodiment of the present application, the method may further include:

[0019] - can be based on the generation rate of entangled photon pairs, and / or the statistical coincidence count rate, and / or

[0020] or self-test results of the radar system to evaluate the functional effectiveness of the quantum entangled light source used to generate the entangled photon pairs; and

[0021] - In case the functional validity of the quantum entangled light source is negative, switching the radar system to FMCW radar mode.

[0022] According to another optional embodiment of the present application, when the radar system is switched from the quantum radar mode to the FMCW radar mode, the electrical operating parameters of the light source driving circuit of the quantum entangled light source can be adjusted to generate a millimeter wave signal. The frequency modulation method for the transmitted signal can also be adjusted to modulate the millimeter wave signal generated by the quantum entangled light source within a set frequency range and modulation rate, and transmit a frequency modulated continuous wave signal whose frequency continuously changes over time. In addition, the operating parameters of the signal receiving unit can also be adjusted to receive the frequency modulated echo signal reflected by the target object in the target detection area, and use the FMCW signal processing algorithm to process the received frequency echo signal, wherein the FMCW signal processing algorithm includes, for example, a distance measurement algorithm based on frequency difference and / or a speed measurement algorithm based on frequency difference.

[0023] According to another optional embodiment of the present application, fault alarm information about the quantum entangled light source may be generated based on the negative functional validity of the quantum entangled light source.

[0024] According to a second aspect of the present application, a radar system based on quantum entangled photons is provided, wherein the radar system may include the following components:

[0025] - a quantum entangled light source configured to generate entangled photon pairs in a quantum radar mode of the radar system;

[0026] - a signal transmitting unit configured to separate the generated entangled photon pairs into detection photons and reference photons for transmission in a quantum radar mode of the radar system, wherein the detection photons are transmitted to a target detection area through a detection path, and the reference photons are transmitted through a reference path;

[0027] - a signal receiving unit configured to detect quantum interference characteristics based on the received reflected photons reflected by the target object and the reference photons propagated through the reference path; and

[0028] - A control unit configured to carry out the method according to the present application.

[0029] According to another optional embodiment of the present application, the signal receiving unit may include the following components:

[0030] - a photon signal receiver configured to receive reflected photons reflected by the target object and reference photons propagated through the reference path;

[0031] - a balanced beam splitter, into which the received reflected photons and the reference photons are input;

[0032] - a coincidence counter configured to count a coincidence rate of entangled photon pairs based on the number of times photons are detected simultaneously at two output ends of the balanced beam splitter; and

[0033] - a time-to-digital converter configured to measure the difference in time of flight of the photons.

[0034] According to another optional embodiment of the present application, the quantum entangled light source may also be configured to generate a millimeter wave signal in an FMCW radar mode of the radar system.

[0035] According to another optional embodiment of the present application, the signal transmitting unit may also be configured to transmit a frequency modulated continuous wave signal whose frequency continuously changes with time in an FMCW radar mode of the radar system.

[0036] According to another optional embodiment of the present application, the signal receiving unit can also be configured to receive a frequency modulated echo signal reflected by a target object in the target detection area in the FMCW radar mode of the radar system, and use an FMCW signal processing algorithm to process the received frequency modulated echo signal, wherein the FMCW signal processing algorithm, for example, includes a distance measurement algorithm based on frequency difference and / or a speed measurement algorithm based on frequency difference.

[0037] According to a third aspect of the present application, a vehicle is provided, comprising the radar system according to the present application.

[0038] According to a fourth aspect of the present application, a computer program product, such as a computer-readable program carrier, is provided, which contains or stores computer program instructions, and when the computer program instructions are executed by a processor, at least assists in implementing the steps of the method described in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The principles, features and advantages of the present invention will be better understood by describing the present invention in more detail below with reference to the accompanying drawings.

[0040] Figure 1 A flowchart showing a method for controlling a radar system based on quantum entangled photons according to an exemplary embodiment of the present application is shown;

[0041] Figure 2 A flowchart showing a method for controlling a radar system based on quantum entangled photons according to another exemplary embodiment of the present application is shown;

[0042] Figure 3 A schematic block diagram showing a radar system based on quantum entangled photons according to an exemplary embodiment of the present application; and

[0043] Figure 4 A schematic diagram of a vehicle according to an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by this application more clearly understood, this application will be further described in detail below with reference to the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit the scope of protection of this application.

[0045] Figure 1 A flowchart of a method for controlling a radar system based on quantum entangled photons according to an exemplary embodiment of the present application is shown. The following exemplary embodiments describe the method according to the present application in more detail.

[0046] like Figure 1 As shown, the method may include steps S1 to S3. In step S1, in the quantum radar mode of the radar system 10, the optical parameters of the generated entangled photon pairs can be adjusted based on the meteorological environment detection information, wherein the optical parameters may include the wavelength and / or pulse frequency of the entangled photon pairs. In the current embodiment of the present application, the radar system 10 is equipped with a quantum entangled light source 11, and entangled photon pairs can be generated by the quantum entangled light source 11 in the quantum radar mode of the radar system 10. The quantum entangled light source 11 can adopt a nonlinear optical crystal such as a periodically poled lithium niobate crystal (PPLN), which generates entangled photon pairs in a wavelength range of, for example, 1400nm to 1600nm through spontaneous parametric down conversion under the excitation of a pump laser, wherein, since the nonlinear optical crystal needs to satisfy the law of conservation of energy, the wavelength λ of the generated entangled photon pair p Has the following relationship:

[0047]

[0048] Among them, with wavelength λ p The short-wave portion is the signal light, with a wavelength of λ i The long-wave portion of the wavelength is the idler light. The quantum entangled light source 11 can be configured as, for example, an automotive-grade erbium-doped fiber laser, which typically has a size of ten millimeters. It can also be further reduced to millimeter-scale using silicon photonic integration technology, making it compatible with CMOS chips and manufactured using fiber integration technology and chip packaging technology.

[0049] Here, the control unit 14 of the radar system 10 can obtain meteorological environment detection information of the driving environment of the vehicle 1 from the on-board meteorological sensors. The on-board meteorological sensors may include, for example, a humidity sensor for measuring air humidity and / or a rain sensor for detecting rainfall. In addition, the control unit 14 of the radar system 10 may also retrieve real-time meteorological environment data for the current vehicle location from a cloud server based on the vehicle's current location information. The meteorological environment detection information may particularly include particulate matter parameters in the driving environment of the vehicle 1, wherein the particulate matter parameters may include particulate matter types, such as water droplets, dust particles, snowflakes, and / or hail particles. Based on the type of particulate matter, it can be determined that the vehicle 1 is currently in different types of weather, such as heavy rain, dense fog, sandstorms, heavy snow or hail, and the wavelength and / or pulse frequency of the generated entangled photon pairs can be adjusted according to the weather type. For example, in foggy weather, the wavelength of the entangled photon pairs can be adjusted to 1600nm, and in heavy rain weather, the wavelength of the entangled photon pairs can be adjusted to 1400nm, so as to reduce Mie scattering and Rayleigh scattering of photons in the environment of the corresponding weather type, thereby optimizing the penetration ability of photons in the environment of the corresponding weather type. Optionally, the particle parameters may also include particle concentration. The higher the particle concentration in the driving environment of the vehicle 1, which means more severe photon scattering caused by these particles, the larger the wavelength of the generated entangled photon pairs is adjusted to reduce the photon scattering effect. The pulse frequency of the generated entangled photon pairs can also be adjusted to a higher frequency to compensate for signal attenuation caused by the photon scattering effect. For example, when the rainfall intensity detected by the rain sensor exceeds 30 mm / h, the wavelength of the entangled photon pairs is adjusted to 1420 nm and the pulse frequency is increased to 200 kHz. Optionally, the particle parameters may also include particle size. The wavelength of the generated entangled photon pairs can be adjusted to increase the deviation between the wavelength of the generated entangled photon pairs and the particle size. This is based on the fact that, according to Mie scattering theory, the scattering effect is strongest when the photon wavelength is close to the particle size. For example, for large raindrops in heavy rain, an entangled photon pair with a wavelength of 1400 nm can be used.

[0050] In step S2, the generated entangled photon pairs can be separated into detection photons and reference photons for emission, wherein the detection photons are emitted to the target detection area via the detection path, and the reference photons are emitted via the reference path. Here, the generated entangled photon pairs can be separated into detection photons and reference photons via a dual-path emission device. According to photon entanglement theory, the measurement of one photon in an entangled photon pair will instantly affect the state of the other photon. Therefore, radar signal extraction can be achieved by jointly measuring the detection photons and the reference photons and utilizing the correlation characteristics between the two. Thus, the detection photons can be emitted via the detection path of the signal emission unit 12 to the target detection area, for example, within 300 meters in front of the vehicle. The detection photons are reflected by the target object in the target detection area back to the radar system 10 and received as reflected photons by the photon signal receiver 131. At the same time, the reference photons can be emitted via the reference path of the signal emission unit 12 and, after propagating along the reference path, are received and stored by the photon signal receiver 131. The stored reference photons can be used as a reference for the corresponding detection photons, thereby resolving the problem of loss of correlation between the radar echo signal and the transmitted signal.

[0051] In step S3, the motion parameters of the target object can be detected based on the quantum interference characteristics of the received reflected photons reflected by the target object in the target detection area and the reference photons propagated through the reference path. Here, because the detection photon and the reference photon of the same entangled photon pair propagate along different optical paths, the optical path difference between the detection path and the reference path causes a certain phase difference between the detection photon and the reference photon. Therefore, by performing quantum interference on the received detection photon and the reference photon in the signal receiving unit 13, the phase difference between the detection photon and the reference photon can be measured, and the motion parameters of the target object can be detected based on the quantum interference characteristics. Specifically, the received reflected photons and reference photons can be respectively input into the balanced beam splitter 132, also known as a 50:50 beam splitter, to count the coincidence counting rate of the photons and measure the flight time difference of the photons, wherein the coincidence counter 133 detects the photons at the two output ends of the balanced beam splitter 132 respectively. When the photons are detected at the two output ends of the balanced beam splitter 132 at the same time, it can be considered that the reflected photons and the reference photons meet the predetermined conditions of the effective detection event of the target object. Therefore, the coincidence counting rate of the photons can be counted based on the number of times the photons are simultaneously detected at the two output ends of the balanced beam splitter 132, that is, the proportion of the number of photons detected at the same time relative to the total number of entangled photon pairs generated. At the same time, the flight time difference Δt of the photons from the emission moment to the reception moment can also be measured by the time-to-digital converter 134.

[0052] Here, the motion parameters of the detected target object can be calculated based on the coincidence count rate and the flight time difference. The detected motion parameters of the target object include distance information, and / or velocity information, and / or azimuth information of the target object. Specifically, when photons are detected simultaneously at the two output ends of the balanced beam splitter 132, the distance d of the target object can be calculated based on the flight time difference Δt of the detection photon or the reference photon. The formula is, for example:

[0053] d=c*Δt / 2,

[0054] Where c represents the speed of light. Furthermore, the time-dependent change in the distance d of the target object, calculated when photons are simultaneously detected at the two output ends of the balanced beam splitter 132, can be recorded, and the speed of the target object can be calculated based on the rate of change of the detected distance d of the target object over time. If multiple signal transmitting units 12 are installed at different locations on the vehicle 1, these signal transmitting units 12 can transmit detection photons and reference photons of multiple entangled photon pairs from different locations, and the azimuth angle of the target object can be calculated using the phase difference or time-of-flight difference between the reflected photons and the reference photons of each received entangled photon pair.

[0055] According to the current embodiment of the present application, a ranging scheme based on the theory of quantum entanglement is proposed. The wavelength and / or pulse frequency of the generated entangled photon pairs are dynamically optimized based on meteorological environment detection information, and the correlation between the entangled photon pairs is used to accurately detect the motion parameters of the target object based on environmental information, thereby effectively suppressing the attenuation of radar signals in severe weather, achieving effective detection of targets at long distances (for example, 300 meters) under severe weather conditions, and significantly improving the resolution of the radar, especially effectively reducing the positioning error of the target object to, for example, less than 5 cm.

[0056] Figure 2 FIG1 shows a flowchart of a method for controlling a radar system based on quantum entangled photons according to another exemplary embodiment of the present application. Figure 1 The differences between the embodiments shown in FIG and FIG are omitted, and the same steps are not described again for the sake of brevity.

[0057] like Figure 2 As shown, the method may further include steps S4 and S5. In step S4, the functional effectiveness of the quantum entangled light source 11 used to generate the entangled photon pairs may be evaluated based on the generation rate of the entangled photon pairs, and / or the statistical coincidence count rate, and / or the self-test result of the radar system 10.

[0058] Here, the generation rate of entangled photon pairs is one of the important indicators for measuring whether the quantum entangled light source 11 is operating normally. When the quantum entangled light source 11 is operating normally, that is, the functional effectiveness of the quantum entangled light source 11 is positive, the quantum entangled light source 11 generates entangled photon pairs at a stable generation rate; when the generation rate of entangled photon pairs is lower than the set threshold (for example, 10 per second), the quantum entangled light source 11 generates entangled photon pairs at a stable generation rate. 6 When the quantum entangled photon pair is detected, it can be considered that the quantum entangled light source 11 enters an abnormal working state - that is, the functional validity of the quantum entangled light source 11 is negative.

[0059] The coincidence count rate is also one of the important indicators for measuring whether the quantum entangled light source 11 is operating normally. For example, when the coincidence count rate remains equal to zero for more than a predetermined time period (for example, any time length from 1s to 3s), it can be considered that the entangled photon pairs cannot be generated or detected normally, thereby determining that the quantum entangled light source 11 has failed, that is, the functional effectiveness of the quantum entangled light source 11 is negative.

[0060] In addition, the working status of the quantum entangled light source 11 and its related components can also be checked through the built-in diagnostic program of the radar system 10, and a corresponding self-test error code can be generated when, for example, the power of the quantum entangled light source 11 is insufficient or a fault occurs, thereby determining that the quantum entangled light source 11 has entered an abnormal working state - that is, the functional validity of the quantum entangled light source 11 is negative.

[0061] In step S5, if the functional validity of the quantum entangled light source 11 is negative, the radar system 10 can be switched to FMCW radar mode. When the radar system 10 switches from the quantum radar mode to the FMCW radar mode, the electrical operating parameters of the light source driving circuit of the quantum entangled light source 11 can be adjusted, particularly by changing the supply voltage or operating current of the driving circuit, so that the quantum entangled light source 11 switches from the quantum radar mode to the FMCW radar mode to generate a millimeter wave signal. Simultaneously, the frequency modulation method of the transmitted signal by the signal transmitting unit 12 can be adjusted to modulate the millimeter wave signal generated by the quantum entangled light source 11 within a set frequency range and modulation rate, thereby transmitting a frequency modulated continuous wave signal whose frequency continuously changes over time. In addition, it is also necessary to adjust the operating parameters of the signal receiving unit 13, including changing the filter parameters, amplifier gain, etc., especially the bandwidth and center frequency of the filter of the signal receiving unit 13 can be adjusted to match the frequency range of the frequency modulated continuous wave signal, so as to be able to receive the frequency modulated echo signal reflected by the target object in the target detection area, and use the FMCW signal processing algorithm to process the received frequency echo signal, and the FMCW signal processing algorithm includes, for example, a distance measurement algorithm based on frequency difference and / or a speed measurement algorithm based on frequency difference.

[0062] It should be noted that the configuration parameters of the various components of the radar system in quantum radar mode and FMCW radar mode can be stored in a preset configuration file and automatically loaded from the corresponding configuration file when switching to the corresponding radar mode. These configuration parameters can also be set and adjusted through the human-computer interface. After the radar system 10 activates the FMCW radar mode, the operating status of the radar system 10 can also be monitored in real time to ensure that the radar system 10 is operating normally in the FMCW radar mode.

[0063] Optionally, fault alarm information about the quantum entangled light source 11 can be generated based on the negative functional validity of the quantum entangled light source 11, and acoustic fault alarm information can be sent to the user through the vehicle voice system, for example, and / or optical fault alarm information can be sent to the user through indicator lights, instrument panel, central control display screen and / or head-up display, etc.

[0064] According to the above-mentioned embodiments of the present application, the quantum radar mode and the FMCW radar mode can be integrated into the radar system, and the system can automatically switch to the FMCW radar mode when the quantum entangled light source 11 fails. The same radar system can be used to detect targets using frequency modulated continuous waves, thereby realizing automatic degradation of the radar system and laying the foundation for reliable control of the vehicle's assisted driving function or automatic driving function.

[0065] In addition, it should be noted that the step numbers described herein do not necessarily represent a chronological order, but are merely a reference mark. The order can be changed according to specific circumstances as long as the technical purpose of this application can be achieved.

[0066] Figure 3 A schematic block diagram of a radar system based on quantum entangled photons according to an exemplary embodiment of the present application is shown.

[0067] like Figure 3 As shown, the radar system 10 may include the following components:

[0068] - a quantum entangled light source 11 configured to generate entangled photon pairs in a quantum radar mode of the radar system 10, and optionally also configured to generate millimeter wave signals in an FMCW radar mode of the radar system;

[0069] - a signal transmitting unit 12 configured to separate the generated entangled photon pair into a detection photon and a reference photon for transmission in a quantum radar mode of the radar system 10, wherein:

[0070] Transmitting the detection photons to a target detection area through a detection path, and transmitting the reference photons through a reference path. Optionally, the signal transmitting unit 12 is further configured to transmit a frequency modulated continuous wave signal whose frequency continuously changes with time in an FMCW radar mode of the radar system;

[0071] - a signal receiving unit 13, which is configured to detect quantum interference characteristics based on the received reflected photons reflected by the target object and the reference photons propagated through the reference path. Optionally, the signal receiving unit 13 is further configured to receive a frequency modulated echo signal reflected by a target object in the target detection area in the FMCW radar mode of the radar system 10, and process the received frequency modulated echo signal using an FMCW signal processing algorithm, wherein the FMCW signal processing algorithm includes, for example, a frequency difference-based distance measurement algorithm and / or a frequency difference-based speed measurement algorithm; and

[0072] A control unit 14 configured to carry out the method according to the present application.

[0073] Optionally, the signal receiving unit 13 may include the following components:

[0074] A photon signal receiver 131 configured to receive reflected photons reflected by the target object and reference photons propagated through the reference path;

[0075] - a balanced beam splitter 132 , into which the received reflected photons and reference photons are input;

[0076] a coincidence counter 133 configured to count the coincidence rate of entangled photon pairs based on the number of times photons are detected simultaneously at the two output ends of the balanced beam splitter 132; and

[0077] A time-to-digital converter 134 configured to measure the difference in time of flight of the photons.

[0078] Figure 4 A schematic diagram of a vehicle 1 according to an exemplary embodiment of the present application is shown. Figure 4 As shown, the vehicle 1 may include the radar system 10 .

[0079] It should be understood that, in this document, the expressions "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the quantity of the indicated technical features.

[0080] If an embodiment includes an "and / or" relationship between a first feature and a second feature, it should be interpreted as follows: according to one embodiment, the embodiment has both the first feature and the second feature, and according to another embodiment, the embodiment has either only the first feature or only the second feature.

[0081] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the present disclosure, even when only a single embodiment is described with respect to specific features. The feature examples provided in the present disclosure are intended to be illustrative and not limiting, unless otherwise stated. In specific implementations, multiple features may be combined with each other, depending on actual needs, where technically feasible. Various substitutions, changes, and modifications may be contemplated without departing from the spirit and scope of the present application.

Claims

1. A method for controlling a radar system (10) based on quantum entangled photons, the method comprising: In a quantum radar mode of the radar system (10), optical parameters of the generated entangled photon pairs are adjusted based on meteorological environment detection information, wherein the optical parameters include the wavelength and / or pulse frequency of the entangled photon pairs; Splitting the generated entangled photon pairs into detection photons and reference photons for emission, wherein the detection photons are emitted to a target detection area through a detection path, and the reference photons are emitted through a reference path; and The motion parameters of the target object are detected based on quantum interference characteristics of the received reflected photons reflected by the target object in the target detection area and the reference photons propagated through the reference path.

2. The method according to claim 1, wherein The meteorological environment detection information includes particulate matter parameters in the driving environment of the vehicle (1), wherein the particulate matter parameters include, for example, particulate matter type, and / or particulate matter concentration, and / or particulate matter size.

3. The method according to claim 2, wherein: The higher the concentration of particulate matter in the driving environment of the vehicle (1), the larger the wavelength of the generated entangled photon pair is adjusted, and / or the higher the pulse frequency of the generated entangled photon pair is adjusted; and / or The types of particulate matter include water droplets, and / or sand and dust particles, and / or snowflake particles, and / or hail particles; and / or The wavelength of the generated entangled photon pair is adjusted so as to increase the deviation between the wavelength of the generated entangled photon pair and the size of the particle.

4. The method according to any one of claims 1 to 3, wherein The received reflected photons and reference photons are input into a balanced beam splitter (132) to count the coincidence count rate of the photons and measure the flight time difference of the photons, wherein the coincidence count rate of the photons is counted based on the number of times the photons are simultaneously detected at the two output ends of the balanced beam splitter (132).

5. The method according to claim 4, wherein The motion parameters of the detected target object are calculated based on the coincidence count rate and the flight time difference. The motion parameters of the detected target object include, for example, distance information, speed information, and / or azimuth information of the target object.

6. The method according to claim 5, wherein: When photons are detected simultaneously at the two output ends of the balanced beam splitter (132), the distance of the target object is calculated based on the measured time difference of the flight of the photons; and / or Calculating the speed of the target based on the rate of change of the detected distance of the target over time; and / or Signal transmitting units (12) installed at different positions transmit detection photons and reference photons of a plurality of entangled photon pairs respectively, and the azimuth angle of the target object is calculated using the phase difference or flight time difference between the reflected photons and the reference photons of each received entangled photon pair.

7. The method according to any one of claims 1 to 6, wherein The method further comprises: Evaluating the functional effectiveness of the quantum entangled light source (11) for generating entangled photon pairs based on the generation rate of entangled photon pairs, and / or the statistical coincidence count rate, and / or the self-test result of the radar system (10); and In case the functional validity of the quantum entangled light source (11) is negative, the radar system (10) is switched to FMCW radar mode.

8. The method according to claim 7, wherein: When the radar system (10) is switched from the quantum radar mode to the FMCW radar mode, adjusting the electrical operating parameters of the light source driving circuit of the quantum entangled light source (11) to generate a millimeter wave signal; Adjusting the frequency modulation mode of the transmission signal to modulate the millimeter wave signal generated by the quantum entangled light source (11) within a set frequency range and modulation rate, and transmitting a frequency modulated continuous wave signal whose frequency continuously changes with time; The operating parameters of the signal receiving unit (13) are adjusted to receive a frequency modulated echo signal reflected by a target object in a target detection area, and the received frequency modulated echo signal is processed using an FMCW signal processing algorithm, wherein the FMCW signal processing algorithm includes, for example, a distance measurement algorithm based on frequency difference and / or a speed measurement algorithm based on frequency difference.

9. The method according to claim 7, wherein: Fault alarm information about the quantum entangled light source (11) is generated based on the negative functional validity of the quantum entangled light source (11).

10. A radar system based on quantum entangled photons (10), wherein: The radar system (10) comprises the following components: a quantum entangled light source (11) configured to generate entangled photon pairs in a quantum radar mode of the radar system (10); A signal transmitting unit (12) is configured to separate the generated entangled photon pairs into detection photons and reference photons for transmission in a quantum radar mode of the radar system (10), wherein the detection photons are transmitted to a target detection area through a detection path, and the reference photons are transmitted through a reference path; a signal receiving unit (13) configured to detect quantum interference characteristics based on the received reflected photons reflected by the target object and the reference photons propagated through the reference path; and A control unit (14) configured to carry out the method according to any one of the preceding claims.

11. The radar system (10) of claim 10, wherein: The signal receiving unit (13) comprises the following components: a photon signal receiver (131) configured to receive reflected photons reflected by the target object and reference photons propagated through the reference path; a balanced beam splitter (132), into which the received reflected photons and reference photons are input; a coincidence counter (133) configured to count a coincidence count rate of entangled photon pairs based on the number of times photons are simultaneously detected at two output ends of the balanced beam splitter (132); and A time-to-digital converter (134) is configured to measure the difference in time of flight of the photons.

12. The radar system (10) according to claim 10 or 11, wherein: The quantum entangled light source (11) is further configured to generate a millimeter wave signal in an FMCW radar mode of the radar system; and / or The signal transmitting unit (12) is further configured to transmit a frequency modulated continuous wave signal whose frequency continuously changes with time in an FMCW radar mode of the radar system; and / or The signal receiving unit (13) is further configured to receive a frequency modulated echo signal reflected by a target object in a target detection area in an FMCW radar mode of the radar system, and process the received frequency modulated echo signal using an FMCW signal processing algorithm, wherein the FMCW signal processing algorithm includes, for example, a frequency difference-based distance measurement algorithm and / or a frequency difference-based speed measurement algorithm.

13. A vehicle (1) comprising a radar system (10) according to any one of claims 10 to 12. 14 . A computer program product, such as a computer-readable program carrier, comprising or storing computer program instructions, which, when executed by a processor, at least assist in implementing the steps of the method according to claim 1 .

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