Single-station passive positioning method, system and device based on quantum irradiation and medium

Abstract

The invention provides a single-station passive positioning method, system and device based on quantum irradiation and a medium, and the method comprises the steps: obtaining the time difference of arrival of signal light and auxiliary light in an entangled photon pair according to an optical delay technology and an interferometer homodyne balance detection technology; calculating the distance difference between the two observation stations and the target object through the time difference of arrival; according to an optical delay technology and an interferometer homodyne balance detection technology, obtaining an azimuth angle of the target object relative to the observation station through a quantum effect enhanced phase method; and according to the distance difference, the azimuth angle and the observation station coordinate position, calculating to obtain the coordinate position of the target object. The method provided by the invention breaks through the shot noise limit, has stronger anti-interference performance in a loss environment, and has a wide application prospect in a future navigation positioning system.

Description

Technical Field

[0001] The present invention belongs to the field of passive positioning, relates to a passive target space positioning technology, and specifically relates to a single-station passive positioning method, system, equipment and medium based on quantum irradiation. Background Art

[0002] Passive positioning technology is a technology that determines the target's position by receiving signals emitted by the target itself or radiation sources in the environment (such as broadcast signals, television signals, radio signals, etc.). For example, passive positioning of the target is performed through an external radiation source. The principle is to use an antenna to receive direct waves from an external radiation source and reflected waves or scattered waves formed after the external radiation source illuminates the target, and use the measured signal reception time difference, azimuth, Doppler frequency shift and other information to complete the detection and navigation positioning of the target.

[0003] However, with the development of modern radar technology, the classic target detection and navigation positioning system faces many challenges. On the one hand, it is difficult to achieve high-precision single-station passive positioning due to the limit of shot noise, and the poor noise performance also limits the strength of the return signal, thereby limiting the detection range; on the other hand, it focuses on detecting long-distance unknown targets and ignores the research and performance analysis of single-station passive positioning methods. At the same time, it usually only performs single parameter enhancement estimation, ignoring the need to accurately estimate multiple parameters simultaneously for applications such as spatial positioning. Summary of the invention

[0004] In order to solve the technical problems that the existing classical measurement system affects the measurement accuracy and detection range due to shot noise, and ignores the need for accurate estimation of multiple parameters for spatial positioning when performing positioning analysis, the present invention discloses a single-station passive positioning method based on quantum irradiation, the method comprising the following steps:

[0005] S1. Obtain the arrival time difference between the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculate the distance difference between the two measuring stations and the target object through the arrival time difference;

[0006] S2. Obtaining the azimuth angle of the target object relative to the measuring station by quantum effect enhanced phase method based on optical delay technology and interferometer homodyne balance detection technology;

[0007] S3. Calculate the coordinate position of the target object according to the distance difference, the azimuth angle and the coordinate position of the measuring station.

[0008] When the above step S1 is specifically implemented, the optical delay technology and the interferometer homodyne balance detection technology are used to obtain the arrival time difference of the signal light and the auxiliary light in the entangled photon pair, and the distance difference between the two measuring stations and the target object is calculated by the arrival time difference, including:

[0009] S11, collecting the light beam of the signal light in the entangled photon pair that is returned after passing through the first measuring station, the target object and the second measuring station in sequence, and collecting the light beam of the auxiliary light in the entangled photon pair that is returned after passing through the optical delay device, the second measuring station, the target object and the first measuring station in sequence;

[0010] S12, interfering the two returned light beams, and measuring first coincidence count rates of the two light beams after interference respectively;

[0011] S13, adjusting the first delay value of the optical delay device by homodyne measurement, and taking the first delay value corresponding to when the difference between the two first coincidence count rates is zero as the arrival time difference;

[0012] S14. Calculate the product of the arrival time difference and the speed of light to obtain the distance difference between the two measuring stations and the target object.

[0013] Furthermore, in the above step S1, the entangled photon source that generates the entangled photon pair is on the same horizontal line as the two measuring stations, and the optical delay device is located between the entangled photon source and the second measuring station.

[0014] Furthermore, in the above step S12, interference is performed on the two returned light beams under the condition of a splitting ratio of 50:50.

[0015] In the specific implementation of the above step S2, the azimuth angle of the target object relative to the measuring station is obtained by using a quantum effect enhanced phase method based on optical delay technology and interferometer homodyne balance detection technology, including:

[0016] S21, receiving the compressed state output by the target object through different receivers in the measuring station, and delaying the compressed state;

[0017] S22, interfering the vacuum state with the delayed compressed state, and measuring the second coincidence count rates of the compressed state and the vacuum state after interference respectively;

[0018] S23, adjusting the second delay value of the optical delay device by homodyne measurement, and taking the second delay value corresponding to when the difference between the two second coincident counting rates is zero as the phase difference;

[0019] S24. Calculate the azimuth of the target object relative to the measuring station according to the phase difference, the distance between the receivers and the wavelength of the compressed state.

[0020] Furthermore, in the above step S22, the delayed compressed state and the vacuum state are interfered with each other under the condition of a splitting ratio of 50:50.

[0021] An embodiment of the present invention also provides a single-station passive positioning system based on quantum irradiation, including a quantum transceiver system, two measuring stations and a computing module.

[0022] Each of the measuring stations is provided with a reflector and a plurality of receivers, wherein the reflector is used to reflect the received signal light or the delayed auxiliary light, and the receiver is used to receive the compressed state output by the target object.

[0023] The quantum transceiver system is used to obtain the arrival time difference of the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculate the distance difference between the two measuring stations and the target object through the arrival time difference; based on the optical delay technology and the interferometer homodyne balance detection technology, the azimuth of the target object relative to the measuring station is obtained through the quantum effect enhanced phase method.

[0024] The calculation module is used to calculate the coordinate position of the target object according to the distance difference, the azimuth and the coordinate position of the measuring station.

[0025] Furthermore, the quantum transceiver system includes an entangled photon source, an optical delay device, an interferometer, a detector and a homodyne adjustment module.

[0026] The entangled photon source is used to generate entangled photon pairs, output the signal light of the entangled photon pairs to one of the measuring stations, and output the auxiliary light to the optical delay device for delay and then output to another measuring station.

[0027] The interferometer is used to interfere with the light beams returned after reflection and output them to the corresponding detectors to measure the first coincidence count rate, and is used to interfere with the vacuum state and the delayed compressed state and output them to the corresponding detectors to measure the second coincidence count rate.

[0028] The zero-difference adjustment module is used to adjust the first delay value of the optical delay device according to the two first coincidence count rates, and collect the first delay value corresponding to the time when the difference between the two first coincidence count rates is zero as the arrival time difference; and is used to adjust the second delay value of the optical delay device according to the two second coincidence count rates, and collect the second delay value corresponding to the time when the difference between the two second coincidence count rates is zero as the phase difference.

[0029] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the above-mentioned single-station passive positioning methods based on quantum irradiation when executing the computer program, thereby solving the technical problems of the existing classical measurement system that are affected by shot noise, affecting the measurement accuracy and detection range, and ignoring the need for precise estimation of multiple parameters for spatial positioning when performing positioning analysis.

[0030] An embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program for executing any of the above-mentioned single-station passive positioning methods based on quantum irradiation, so as to solve the technical problems of the existing classical measurement system caused by shot noise affecting the measurement accuracy and detection range, and ignoring the need for precise estimation of multiple parameters for spatial positioning when performing positioning analysis.

[0031] The single-station passive positioning method based on quantum irradiation of the present invention, firstly, by using entangled photon pairs, the arrival time difference of the entangled photon pairs can be obtained by adopting optical delay and dry homodyne measurement, and the distance difference between the two measuring stations and the target object can be calculated through the arrival time difference; secondly, by using a vacuum state and a compressed state with enhanced quantum effect, the azimuth of the target object relative to the measuring station can be obtained by adopting optical delay and dry homodyne measurement; finally, the target object can be accurately positioned by combining the obtained distance difference and azimuth with the spatial geometric configuration to obtain the coordinate position of the target object.

[0032] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least: the method of the present invention breaks through the shot noise limit and has stronger anti-interference performance in a lossy environment, and has broad application prospects in future navigation and positioning systems. Taking the planar target positioning task of the lidar system as an example, the method of the present invention improves the ranging accuracy by 28.8% and the azimuth measurement accuracy by 63.3% compared with the classical solution; combined with different spatial geometric configurations, quantum navigation positioning with significantly improved comprehensive accuracy can be achieved; in the absence of transmission environment loss, the spatial positioning accuracy of the target object of the present invention is increased by about 44%, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1A flowchart of a single-station passive positioning method based on quantum irradiation disclosed in an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the transmission paths of the signal light and the auxiliary light in the entangled photon pair disclosed in the embodiment of the present invention;

[0036] Figure 3 A schematic diagram of the entangled photons disclosed in an embodiment of the present invention interfering with two returned light beams and measuring the arrival time difference by homodyne;

[0037] Figure 4 A schematic diagram of measuring azimuth angle using a quantum effect enhancement method based on quantum squeezed states disclosed in an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of measuring azimuth angle using a quantum effect enhancement method based on quantum squeezed states disclosed in an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of measuring phase difference by interference and homodyne according to an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of a computer device disclosed in an embodiment of the present invention;

[0041] Among them, 701 is a memory; 702 is a processor. DETAILED DESCRIPTION

[0042] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0043] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0044] The embodiment of the present invention discloses a single-station passive positioning method based on quantum irradiation, see Figure 1 As shown, the method comprises the following steps:

[0045] S1. Obtain the arrival time difference between the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculate the distance difference between the two measuring stations and the target object through the arrival time difference;

[0046] S2. Obtaining the azimuth angle of the target object relative to the measuring station by quantum effect enhanced phase method based on optical delay technology and interferometer homodyne balance detection technology;

[0047] S3. Calculate the coordinate position of the target object according to the distance difference, the azimuth angle and the coordinate position of the measuring station.

[0048] When the above step S1 is specifically implemented, the optical delay technology and the interferometer homodyne balance detection technology are used to obtain the arrival time difference of the signal light and the auxiliary light in the entangled photon pair, and the distance difference between the two measuring stations and the target object is calculated by the arrival time difference, including:

[0049] S11, collecting the light beam of the signal light in the entangled photon pair that passes through the first measuring station, the target object and the second measuring station in sequence and returns, and collecting the light beam of the auxiliary light in the entangled photon pair that passes through the optical delay device, the second measuring station, the target object and the first measuring station in sequence and returns.

[0050] Specifically, Figure 2 As shown in the figure, it is assumed that the target to be measured is located at point M, the first measuring station is S, the second measuring station is R, and the quantum entanglement source E in the quantum transceiver system is located at a certain point on the baseline SR. The entangled photon pair is generated by the quantum entanglement source E, where one beam of light as the signal light reaches the first measuring station S and then irradiates the target object M, and after being reflected by the target object, enters the second measuring station R and then directly returns to the quantum entanglement measurement device at the quantum transceiver system, that is, Figure 2 The path shown outside the middle triangle box; the other beam of light as auxiliary light reaches the second measuring station R through the optical delay device D (also called adjustable optical delay device), and enters the quantum entanglement measurement device at the quantum transceiver system from the opposite direction, that is, Figure 2 The path is shown in the middle triangle.

[0051] Ignoring the position difference inside the quantum entanglement measurement device and assuming that the signal does not generate path delay when it is transmitted inside the quantum transceiver system, the round-trip time t between the signal beam and the auxiliary beam is L and t R They can be expressed as formula (1):

[0052]

[0053] In the above formula (1), r M 、r S 、r R 、r EThey represent the position coordinates of the quantum entanglement source E in the target object M, the first measuring station S, the second measuring station R, and the quantum transceiver system respectively. Δt is the time delay generated by the adjustable optical delay device D, that is, the first delay value of the following formula (2).

[0054] S12, interfering the two returned light beams, and respectively measuring the first coincidence count rates of the two light beams after the interference.

[0055] Specifically, Figure 3 As shown, the two returned light beams interfere in the beam splitter BS and are output, and the output interference light beams are collected by corresponding detectors respectively.

[0056] More specifically, the two returning light beams are interfered with each other at a splitting ratio of 50:50.

[0057] S13, adjusting the first delay value of the optical delay device by homodyne measurement, and taking the first delay value corresponding to when the difference between the two first coincidence count rates is zero as the arrival time difference;

[0058] S14. Calculate the product of the arrival time difference and the speed of light to obtain the distance difference between the two measuring stations and the target object.

[0059] When the above steps S12 to S14 are implemented, the homodyne balance detection condition of the HOM interferometer is t L =t R , that is, the time delay of the entangled photon pair along the two paths is equal. At this time, the coincidence count rate of the single-photon detector is zero and unique, and the time delay result corresponds to the time difference of a arrival (TDOA) from the first station S and the second station R to the target M.

[0060] Therefore, t L =t R Substituting into the above formula (1) and assuming that there is no transmission environment loss, the relationship between the two path lengths, that is, the distance difference between the two measuring stations and the target object, can be seen in the following formula (2):

[0061] r M -r S |+|r S -r E |=|r M -r R |+|r R -r E |+cΔt Formula (2)

[0062] In formula (2), c is the speed of light in vacuum, and Δt is the first delay value of the adjustable optical delay device when the interferometer coincidence counting result is zero.

[0063] Furthermore, when the above step S1 is implemented, the entangled photon source that generates the entangled photon pair is on the same horizontal line as the two measuring stations, and the optical delay device is located between the entangled photon source and the second measuring station.

[0064] In the specific implementation of the above step S2, the azimuth angle of the target object relative to the measuring station is obtained by using a quantum effect enhanced phase method based on optical delay technology and interferometer homodyne balance detection technology, including:

[0065] S21. Receive the compressed state output by the target object through different receivers in the measuring station, and delay the compressed state.

[0066] S22, interfering the vacuum state with the delayed compressed state, and measuring the second coincidence count rates of the compressed state and the vacuum state after interference, respectively.

[0067] Specifically, the delayed compressed state and the vacuum state are interfered with each other under the condition of a splitting ratio of 50:50.

[0068] S23, adjusting the second delay value of the optical delay device by homodyne measurement, and taking the second delay value corresponding to when the difference between the two second coincident counting rates is zero as the phase difference.

[0069] S24. Calculate the azimuth of the target object relative to the measuring station according to the phase difference, the distance between the receivers and the wavelength of the compressed state.

[0070] In the specific implementation of the above steps S22 to S24, due to the existence of vacuum noise, the expected value of the electric field operator in the coherent state changes with time and shows quantum fluctuations. The angle measurement accuracy of the phase method can be improved by using the fact that the noise on a certain component of the quantum squeezed state is lower than the shot noise limit.

[0071] Among them, the use of quantum effects to enhance the angle measurement accuracy of the phase method includes quantum effect enhancement based on quantum entangled states and quantum compressed states, see Figure 4 and Figure 5 As shown, the interferometer adopts a dual-mode input and dual-mode output structure, and the input to the interferometer (i.e. Figure 4 and Figure 5 The vacuum state and the delayed compressed state produce interference at the 50 / 50 beam splitter BS, and the light intensities at the two input ports are I a,in ,I b,in The light intensity at the two output ports is I a,out ,I b,out , and the optical delay (i.e. Figure 4 and Figure 5The relationship between the second delay value φ (also called optical phase delay) generated by the phase delay device shown in FIG. 1 and FIG. 2 is shown in formula (3):

[0072]

[0073] Therefore, the phase difference φ can be determined by homodyne measurement of the light intensity at the two output ports of the interferometer. Figure 4 and Figure 5 As shown, the modes of the two input ports are respectively represented by operators and Indicates that the operators of the output ports are respectively and Indicates that the splitting ratio of the beam splitter BS is 50 / 50, then refer to the following formula (4):

[0074]

[0075] In the above equation (4), φ0 is the initial phase difference of the two input port signals, and φ is the small phase shift variation near the initial phase difference, that is, the phase difference obtained by zero-difference measurement, that is, the second delay value. The photon number difference operator of the two output modes of the interferometer is It can be expressed by the following formula (5):

[0076]

[0077] The photon number difference measurement result is related to the real number part of the first term on the right side of equation (5): is the input photon number operator, so the maximum slope of the cos(φ0+φ) function graph corresponds to the highest sensitivity of the small phase shift change φ near the initial phase difference. Therefore, the optical path difference between the two arms of the interferometer can be adjusted to set the initial phase φ0 to ±π / 2, at which time the sensitivity of the phase shift parameter Δφ estimated from the photon number difference measurement result is the highest. Here, the initial phase φ0 is set to -π / 2, and φ<<1, sinφ≈φ.

[0078] The signal-to-noise ratio of phase measurement is shown in the following equation (6), where the first term on the right is the phase signal to be measured, and the second term is the introduced vacuum noise. Since the average number of photons in vacuum noise is zero, that is, So the average value of the photon number difference is and noise fluctuations where n = |α| 2 is the average number of photons of the input coherent state signal:

[0079]

[0080] According to the above formula (6), the minimum measurable phase (the signal to be measured when the signal-to-noise ratio (SNR) is 1) that can be achieved by the interferometer structure based on the dual-mode input of quantum squeezed state and vacuum state reaches the standard quantum limit

[0081] Compared to the average number of photons in the vacuum state, which is 0, the average number of photons in the compressed state will become Among them, r≥0 is the compression factor, which reflects the degree of quantum compression. When r=0, it is the classical coherent state input.

[0082] By performing homodyne measurement on the two output ports of the interferometer, the average value of the photon number difference operator in the compression case can be obtained. The corresponding noise fluctuation can be expressed as follows (7):

[0083]

[0084] Similarly, the phase measurement signal-to-noise ratio and the minimum measurable value based on the compressed state can be obtained as shown in the following formula (8):

[0085]

[0086] Among them, in the above formula (8), the compression factor r is a very critical control parameter. Under the existing experimental conditions, the degree of quantum compression is greatly limited. In the two input ports of the interferometer, the number of coherent state photons is much larger than the number of compressed state photons, that is, |α| 2 >>sinh 2 r, then the minimum measurable phase measurement will tend to φ≈1 / (n 1 / 2 e r ). With the continuous development of quantum technology, the achievable compression factor r is also increasing, and the azimuth measurement accuracy based on homodyne measurement will also continue to improve.

[0087] After calculating the phase difference φ, the formula The azimuth angle θ is inverted, where λ is the signal wavelength and l is the distance between the two receivers, which is a constant.

[0088] When the above step S3 is specifically implemented, see Figure 6 As shown in the figure, an entangled photon pair is generated at the coordinate origin O, one of which is used as a signal light (left) to detect the target object. It is emitted by the optical device at point S to the target object and reaches the receiver at point N after being reflected by the target object; the other is used as an idle light (right) and passes through a local time delay device to reach the receiver at point N. At this time, the entangled signal light and the idle light interfere at the receiver, and the entanglement measurement is performed using the method in Section 2, and the round-trip time on the left and right optical paths is obtained as follows:

[0089]

[0090] The homodyne condition balanced by the HOM interferometer: the delay of the entangled photon pair along the left and right paths is equal, that is, t L =t R , so R L =R R +cΔt, where Δt=(n-1)d is the arrival time difference between base stations S and R and the target location M. The distance difference obtained by the quantum radar positioning system through homodyne measurement is:

[0091] ρ - =R L -R R =cΔt Formula (10)

[0092] Combine formula (10) with Combined, can be obtained Among them, L, R R , R L They represent the distance between the two stations, the distance between station R and target M, and the distance between station S and target M, respectively. - For R L With R R The distance difference is calculated based on the geometric relationship between the target and the receiver to calculate the x and y values ​​of the target coordinate position, and the positioning of the target is completed, and the following formula (11) is obtained:

[0093]

[0094] The single-station passive positioning method based on quantum irradiation of the present invention, firstly, by using entangled photon pairs, the arrival time difference of the entangled photon pairs can be obtained by adopting optical delay and dry homodyne measurement, and the distance difference between the two measuring stations and the target object can be calculated through the arrival time difference; secondly, by using a vacuum state and a compressed state with enhanced quantum effect, the azimuth of the target object relative to the measuring station can be obtained by adopting optical delay and dry homodyne measurement; finally, the target object can be accurately positioned by combining the obtained distance difference and azimuth with the spatial geometric configuration to obtain the coordinate position of the target object.

[0095] The method of the present invention has the advantages of improving the ranging accuracy by 28.8% and the azimuth measurement accuracy by 63.3% compared with the classical scheme; combining different spatial geometric configurations, it can achieve quantum navigation positioning with significantly improved comprehensive accuracy; in the absence of transmission environment loss, the spatial positioning accuracy of the target object of the present invention is increased by about 44%, etc.

[0096] Based on the same inventive concept, a single-station passive positioning system based on quantum irradiation is also provided in an embodiment of the present invention, as described in the following embodiments. Since the principle of solving the problem by the single-station passive positioning system based on quantum irradiation is similar to the above-mentioned single-station passive positioning method based on quantum irradiation, the implementation of the single-station passive positioning system can refer to the implementation of the above-mentioned single-station passive positioning method based on quantum irradiation, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements predetermined functions. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0097] The single-station passive positioning system based on quantum irradiation disclosed in an embodiment of the present invention includes a quantum transceiver system, two measuring stations and a computing module. The structure is described below.

[0098] Each of the measuring stations is provided with a reflector and a plurality of receivers, wherein the reflector is used to reflect the received signal light or the delayed auxiliary light, and the receiver is used to receive the compressed state output by the target object.

[0099] The quantum transceiver system is used to obtain the arrival time difference of the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculate the distance difference between the two measuring stations and the target object through the arrival time difference; based on the optical delay technology and the interferometer homodyne balance detection technology, the azimuth of the target object relative to the measuring station is obtained through the quantum effect enhanced phase method.

[0100] The calculation module is used to calculate the coordinate position of the target object according to the distance difference, the azimuth and the coordinate position of the measuring station.

[0101] Furthermore, the quantum transceiver system includes an entangled photon source, an optical delay device, an interferometer, a detector and a homodyne adjustment module.

[0102] The entangled photon source is used to generate entangled photon pairs, output the signal light of the entangled photon pairs to one of the measuring stations, and output the auxiliary light to the optical delay device for delay and then output to another measuring station.

[0103] The interferometer is used to interfere with the light beams returned after reflection and output them to the corresponding detectors to measure the first coincidence count rate, and is used to interfere with the vacuum state and the delayed compressed state and output them to the corresponding detectors to measure the second coincidence count rate.

[0104] The zero-difference adjustment module is used to adjust the first delay value of the optical delay device according to the two first coincidence count rates, and collect the first delay value corresponding to the time when the difference between the two first coincidence count rates is zero as the arrival time difference; and is used to adjust the second delay value of the optical delay device according to the two second coincidence count rates, and collect the second delay value corresponding to the time when the difference between the two second coincidence count rates is zero as the phase difference.

[0105] The embodiments of the present invention achieve the following technical effects: the method of the present invention breaks through the shot noise limit and has stronger anti-interference performance in a lossy environment, and has broad application prospects in future navigation and positioning systems. Taking the planar target positioning task of the laser radar system as an example, the method of the present invention improves the ranging accuracy by 28.8% and the azimuth measurement accuracy by 63.3% compared with the classical solution; combined with different spatial geometric configurations, quantum navigation positioning with significantly improved comprehensive accuracy can be achieved; in the absence of transmission environment loss, the spatial positioning accuracy of the target object of the present invention is increased by about 44%, etc.

[0106] In this embodiment, a computer device is provided, such as Figure 7 As shown, it includes a memory 701, a processor 702, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, any of the above-mentioned single-station passive positioning methods based on quantum irradiation is implemented.

[0107] Specifically, the computer device may be a computer terminal, a server or a similar computing device.

[0108] In this embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program for executing any of the above-mentioned single-station passive positioning methods based on quantum irradiation.

[0109] Specifically, computer-readable storage media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0110] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A single-station passive positioning method based on quantum irradiation, characterized in that: include: According to the optical delay technology and the interferometer homodyne balance detection technology, the arrival time difference of the signal light and the auxiliary light in the entangled photon pair is obtained, and the distance difference between the two measuring stations and the target object is calculated through the arrival time difference; According to the optical delay technology and the interferometer homodyne balance detection technology, the azimuth angle of the target object relative to the measuring station is obtained by the quantum effect enhanced phase method; The coordinate position of the target object is obtained by calculating the distance difference, the azimuth angle and the coordinate position of the measuring station.

2. The single-station passive positioning method based on quantum irradiation according to claim 1 is characterized in that: The method of obtaining the arrival time difference between the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculating the distance difference between the two measuring stations and the target object through the arrival time difference, includes: Collecting the light beam of the signal light in the entangled photon pair that is returned after passing through the first measuring station, the target object, and the second measuring station in sequence, and collecting the light beam of the auxiliary light in the entangled photon pair that is returned after passing through the optical delay device, the second measuring station, the target object, and the first measuring station in sequence; Interfere the two returned light beams, and respectively measure the first coincidence count rates of the two light beams after interference; Adjusting the first delay value of the optical delay device by homodyne measurement, and taking the first delay value corresponding to when the difference between the two first coincidence count rates is zero as the arrival time difference; The product of the arrival time difference and the speed of light is calculated to obtain the distance difference between the two measuring stations and the target object.

3. The single-station passive positioning method based on quantum irradiation according to claim 2 is characterized in that: An entangled photon source generating the entangled photon pair is on the same horizontal line as the two measuring stations, and the optical delay device is located between the entangled photon source and the second measuring station.

4. The single-station passive positioning method based on quantum irradiation according to claim 2 is characterized in that: The two returning light beams are interfered with under the condition of 50:50 splitting ratio.

5. The single-station passive positioning method based on quantum irradiation according to claim 1, characterized in that: The method of obtaining the azimuth angle of the target object relative to the measuring station by using a quantum effect enhanced phase method based on the optical delay technology and the interferometer homodyne balance detection technology includes: receiving the compressed state output by the target object through different receivers in the measuring station, and delaying the compressed state; interfering the vacuum state with the delayed compressed state, and measuring the second coincidence count rates of the compressed state and the vacuum state after interference respectively; Adjusting the second delay value of the optical delay device by homodyne measurement, and taking the second delay value corresponding to the time when the difference between the two second coincident counting rates is zero as the phase difference; The azimuth of the target object relative to the measuring station is calculated according to the phase difference, the distance between the receivers and the wavelength of the compressed state.

6. The single-station passive positioning method based on quantum irradiation according to claim 5 is characterized in that: The delayed squeezed state interferes with the vacuum state at a splitting ratio of 50:

50.

7. A single-station passive positioning system based on quantum irradiation, characterized in that: include: Two measuring stations, each measuring station is provided with a reflector and a plurality of receivers, the reflector is used to reflect the received signal light or the delayed auxiliary light, and the receiver is used to receive the compressed state output by the target object; A quantum transceiver system, the quantum transceiver system is used to obtain the arrival time difference of the signal light and the auxiliary light in the entangled photon pair based on the optical delay technology and the interferometer homodyne balance detection technology, and calculate the distance difference between the two measuring stations and the target object through the arrival time difference; based on the optical delay technology and the interferometer homodyne balance detection technology, the azimuth of the target object relative to the measuring station is obtained through the quantum effect enhanced phase method; A calculation module is used to calculate the coordinate position of the target object according to the distance difference, the azimuth and the coordinate position of the measuring station.

8. The single-station passive positioning system based on quantum irradiation according to claim 7, characterized in that: The quantum transceiver system includes an entangled photon source, an optical delay device, an interferometer, a detector and a homodyne adjustment module; The entangled photon source is used to generate entangled photon pairs, output the signal light of the entangled photon pairs to one of the measuring stations, and output the auxiliary light to the optical delay device for delay before outputting it to another measuring station; The interferometer is used to interfere with the light beams returned after being reflected and then output them to the corresponding detectors to measure the first coincidence count rate, and is used to interfere with the vacuum state and the delayed compressed state and then output them to the corresponding detectors to measure the second coincidence count rate; The zero difference adjustment module is used to adjust the first delay value of the optical delay device according to the two first coincidence count rates, and collect the first delay value corresponding to when the difference between the two first coincidence count rates is zero as the arrival time difference; It is used to adjust the second delay value of the optical delay device according to the two second coincidence count rates, and take the second delay value corresponding to when the difference between the two second coincidence count rates is zero as the phase difference.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the single-station passive positioning method based on quantum irradiation according to any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for executing the single-station passive positioning method based on quantum irradiation according to any one of claims 1 to 6.

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