High-sensitivity anti-interference satellite navigation signal receiving system and method based on Rydberg atoms

Abstract

The invention relates to a high-sensitivity anti-interference satellite navigation signal receiving system and method based on Rydberg atoms, and the system comprises a signal detection unit which is used for receiving a satellite navigation direct signal and outputting an electric signal; the data receiving unit is used for processing the electric signal output by the signal detection unit and outputting a navigation message; the power distribution unit is used for providing power for the signal detection unit and the data receiving unit; the signal detection unit comprises an atomic antenna which comprises four miniature atomic air chambers and is used for receiving satellite navigation direct signals from different directions; the light path system is used for providing detection laser and coupling laser for the miniature atomic gas chamber so as to excite atoms in the miniature atomic gas chamber from a first low-energy-level state to a high-energy-level state; and the patch antenna is arranged on one side of the miniature atomic gas chamber and is used for providing a local oscillation microwave signal for the miniature atomic gas chamber so as to realize superheterodyne high-sensitivity microwave signal receiving.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite navigation signal reception, and particularly to a highly sensitive anti-jamming satellite navigation signal reception system and method based on Rydberg atoms. Background Art

[0002] Satellite navigation systems are playing an increasingly important role in national defense construction and the national economy, and have become an important strategic basic resource of the country. Therefore, their security, especially the survivability during wartime, has also received increasing attention. Satellite navigation and positioning are usually obtained by a navigation receiver through receiving navigation signals, digital signal processing, and navigation solution. However, in complex terrain combat environments such as mountains, dense forests, and tunnels, due to shielding, satellite signals are very weak, sometimes even only -160 dBmW, 30 dB lower than in open environments. Ordinary satellite navigation receivers can no longer work properly. On the other hand, during special periods such as war, navigation signals are extremely vulnerable to interference, causing the satellite navigation system to quickly become paralyzed. Therefore, developing navigation signal receivers with high sensitivity and strong anti-jamming capabilities is of great significance for the Beidou navigation constellation in China to efficiently perform high-precision navigation, positioning, and other functions in complex environments.

[0003] There are mainly the following three ways to improve the sensitivity of traditional navigation receivers: signal-to-noise ratio improvement, cross-correlation suppression, and assisted GPS. Currently, the main idea of signal-to-noise ratio improvement is to lengthen the effective integration time of data, including coherent and non-coherent integration times; the cross-correlation suppression method is to obtain the information of the signal with strong power by tracking, and remove the strong signal interference according to the information; the assisted GPS method generally requires external provision of certain information of the receiver during the positioning process, such as position, time, satellite clock correction parameters, etc., to help the receiver achieve signal acquisition. However, these technologies have deficiencies such as increased response time, limited coverage, and poor positioning accuracy.

[0004] The existing optimization strategies for improving the anti-jamming performance of satellite navigation mainly include: increasing the ground power of navigation signals, developing inter-satellite link technology, constructing a new constellation layout, and optimizing the design system of navigation signals. To increase the transmission power of navigation signals, a spot beam antenna is usually used to enhance the navigation signal level in a specific area; inter-satellite link and new constellation layout technologies can improve the stable operation time of navigation satellites independently of the ground control part, so as to increase the accuracy of positioning services and enhance the survivability of the navigation constellation at the same time; innovation in the navigation signal system can improve the tracking sensitivity of the receiver and enhance the anti-jamming ability of the signal system itself by introducing pilot signals. For example, in the case of suppressing interference, to enhance the acquisition ability of the receiver in a strong interference environment, the characteristics of the desired signal and the interference signal in the time domain, transform domain, and spatial domain are usually used to detect and eliminate the interference signal. However, these existing technical means face challenges such as a long construction period and high costs, and the existing anti-jamming suppression algorithms cannot meet the volume requirements of anti-jamming receivers for some small platforms by increasing the number of array antenna elements to improve the anti-jamming ability.

[0005] Therefore, it is urgent to explore a new technical system and method for receiving satellite navigation signals to address the key problems faced by existing satellite navigation signals in terms of sensitivity, anti-jamming, etc. Summary of the Invention

[0006] To solve the technical problems existing in the above-mentioned prior art, the object of the present invention is to provide a highly sensitive anti-jamming satellite navigation signal receiving system, electronic device, and storage medium based on Rydberg atoms, which have the characteristics of high sensitivity and strong anti-jamming ability, and are suitable for the detection and reception of high-sensitivity navigation signals in complex electromagnetic environments.

[0007] To achieve the above-mentioned invention object, the present invention provides a highly sensitive anti-jamming satellite navigation signal receiving system based on Rydberg atoms, which is characterized by including:

[0008] A signal detection unit for receiving the direct satellite navigation signal and outputting an electrical signal;

[0009] A data receiving unit for performing signal processing on the electrical signal output by the signal detection unit and outputting navigation telegrams;

[0010] A power distribution unit for providing power to the signal detection unit and the data receiving unit;

[0011] The signal detection unit includes:

[0012] An atomic antenna including four non-coplanar micro atomic gas cells for receiving the direct satellite navigation signal from different directions;

[0013] An optical path system for providing a detection laser and a coupling laser to the micro atomic gas cell to excite the atoms in the micro atomic gas cell from a first low energy level state to a Rydberg state;

[0014] A patch antenna is arranged on one side of the micro atomic gas cell for providing a local oscillator microwave signal to the micro atomic gas cell to achieve superheterodyne high-sensitivity microwave signal reception.

[0015] According to a technical solution of the present invention, the optical path system includes:

[0016] A detection laser laser and a coupling laser laser are connected to the micro atomic gas cell through optical fibers for providing the detection laser and the coupling laser to the micro atomic gas cell;

[0017] A laser frequency stabilization device for stabilizing the frequencies of the detection laser laser and the coupling laser and outputting a laser beam with an ultra-narrow linewidth;

[0018] A photodetector is arranged corresponding to the micro atomic gas cell one by one for receiving the optical signal passing through the micro atomic gas cell, converting the received optical signal into an electrical signal, and outputting it to the data receiving unit;

[0019] An optical path system control device for controlling the detection laser laser, the coupling laser laser, the laser frequency stabilization device, and the photodetector to work and checking their working states.

[0020] According to a technical solution of the present invention, the optical path system further includes:

[0021] A pump laser is connected to the micro atomic gas cell through an optical fiber for outputting a pump laser to the micro atomic gas cell to excite the atoms in the micro atomic gas cell from a third low energy level state to a fourth low energy level state, and the atoms in the fourth low energy level state can spontaneously radiate and transition to the first low energy level state;

[0022] The pump laser and the detection laser are arranged on the same side of the micro atomic gas cell at the input end of the micro atomic gas cell, and after passing through the micro atomic gas cell, the pump laser and the detection laser are output to the photoelectric sensor through an optical fiber.

[0023] According to a technical solution of the present invention, the data receiving unit includes:

[0024] An A / D conversion module for converting the electrical signal into a digital signal in discrete time;

[0025] A baseband signal processing module for signal acquisition and tracking of the digital signal;

[0026] A navigation solution module, configured to calculate satellite navigation signal measurement values based on the processing results of the baseband signal processing module, and demodulate navigation messages; the satellite navigation signal measurement values include pseudorange and carrier phase.

[0027] According to one technical solution of the present invention, the detection laser and the coupling laser are ultra-narrow linewidth laser beams with a linewidth stabilized below 100 Hz.

[0028] According to one aspect of the present invention, there is provided a method for receiving satellite navigation signals, implemented based on the above-mentioned highly sensitive anti-jamming satellite navigation signal receiving system based on Rydberg atoms, including the following steps:

[0029] Step S1: Power on through the power distribution unit to perform system initialization and detection preparation;

[0030] Step S2: Tune the wavelengths of the detection laser and the coupling laser through the optical path system and the atomic antenna;

[0031] Step S3: Stabilize the frequencies of the detection laser and the coupling laser through the optical path system;

[0032] Step S4: Provide a local oscillator microwave signal to the micro atomic gas cell through the patch antenna to achieve superheterodyne high-sensitivity microwave signal reception;

[0033] Step S5: Based on the electromagnetically induced transparency effect and the AT splitting effect, use the four micro atomic gas cells to optically measure the navigation signals in different directions of the same target in the environment to obtain the electrical signals of the navigation signals;

[0034] Step S6: Process the electrical signals of the navigation signals through the data receiving unit and output navigation messages.

[0035] According to one technical solution of the present invention, in the step S1, it specifically includes:

[0036] Step S11: Power on the signal detection unit and the data receiving and processing unit through the power distribution unit and perform system initialization;

[0037] Step S12: According to the received navigation signal detection instruction, judge whether the laser emission condition is satisfied. If satisfied, execute step S2.

[0038] According to one technical solution of the present invention, in the step S2, it specifically includes:

[0039] The detection laser and the coupling laser are respectively output by the detection laser laser and the coupling laser in the optical path system. After being input into the micro atomic gas cell through the optical fiber, they are incident on the micro atomic gas cell in opposite directions; after passing through the micro atomic gas cell, the detection laser is coupled and output to the photodetector in the optical path system through the optical fiber.

[0040] In the step S3, it specifically includes:

[0041] The detection laser laser and the coupling laser are frequency stabilized by the laser frequency stabilization device in the optical path system, so that the line widths of the detection laser and the coupling laser are stabilized below 100 Hz.

[0042] According to a technical solution of the present invention, in the step S4, it specifically includes:

[0043] Step S41: Output a local oscillator microwave signal to the micro atomic gas cell through the patch antenna. The local oscillator microwave signal is coupled with the atoms in the micro atomic gas cell to realize superheterodyne high-sensitivity microwave signal reception;

[0044] Step S42: Output a pump laser to the micro atomic gas cell through the pump laser in the optical path system, so that the atoms in the micro atomic gas cell are excited from the third lowest energy level state to the fourth lowest energy level state.

[0045] According to a technical solution of the present invention, in the step S5, the phase information of the navigation signal is obtained by using the micro atomic gas cell through the atomic superheterodyne measurement method, and the arrival wave angle is inversely calculated through the phase difference of the same signal received by the micro atomic gas cells at different positions. The specific calculation formula is as follows:

[0046]

[0047] Among them: θ represents the target azimuth angle, and Δd represents the interval distance of the atomic gas cell. is the phase difference measured by the atomic gas cells at different positions, and λ is the wavelength of the signal to be measured.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] The present invention provides a highly sensitive and anti-interference satellite navigation signal receiving system and method based on Rydberg atoms. By utilizing the characteristic that highly excited electrons in Rydberg atoms are easily interacted with the microwave electric field, the detection of microwave signals is realized. The process of detecting microwave signals does not involve the process of driving free electrons by electromagnetic waves to generate current. Therefore, its detection sensitivity can break through the thermal noise limit. Due to the rich energy level structure of Rydberg atoms, the reception of ultra-narrow linewidth signals can be achieved, and it has very good anti-interference ability. At the same time, through an integrated optical path design, the atomic gas cell, the detection laser path, the circuit system, and the data processor are integrated on one receiver, thereby reducing the complexity of system operation and improving the overall reliability, which is more conducive to being carried on a spaceborne platform to achieve the detection of highly sensitive microwave signals, and has important significance for future time-sensitive target detection, deep space high-precision navigation, etc.

[0050] In the present invention, the signal detection unit includes an atomic antenna, an optical path system, and a patch antenna. The atomic antenna includes four micro atomic gas cells, forming an atomic antenna array, which can receive the same target signal from different directions, realize the measurement of the phase information of the microwave field, establish a method for analyzing phase differences and revising error models, and inversely calculate the incident wave angle, thereby realizing the traceability of the signal direction and performing passive positioning.

[0051] In the present invention, by utilizing the characteristic that highly excited electrons in Rydberg atoms are easily interacted with the microwave electric field, the microwave field strength is directly related to the frequency through basic physical constants, realizing a new microwave signal measurement that can be traced back to Planck's constant, and the sensitivity is extremely high, which can break through the limitation of the thermal noise limit of traditional technologies. By introducing a local oscillator microwave signal through a patch antenna and outputting a pump laser signal to the atomic gas cell through a pump laser, the microwave detection sensitivity of the system can be further improved.

[0052] In the present invention, the detection laser and the coupling laser are modulated by a laser frequency stabilization device to output a laser beam with an ultra-narrow linewidth, which can realize the reception of ultra-narrow linewidth signals, solve the problem of signal interference in a complex electromagnetic environment, and has very good anti-interference ability. And the atomic gas cell is made of non-metallic material, which generates very little interference to the electric field to be measured, and its theoretical measurement accuracy is much higher than that of traditional electronic microwave measurement technologies.

[0053] The present invention adopts an integrated optical path design, integrating the atomic gas cell, the optical path system, the circuit system, and the data processor on one receiver, solving the problem that traditional receivers need to replace antennas of different sizes for receiving navigation signals of different frequency bands; thereby reducing the complexity of system operation and improving the overall reliability, which is more conducive to being carried on a spaceborne platform for application. Description of the Drawings

[0054] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0055] Figure 1 Schematically showing the structural schematic diagram of a highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms provided in the embodiments of the present invention;

[0056] Figure 2 Schematically showing the schematic diagram of the energy level structure model of Rydberg atoms for detecting navigation signals provided in the embodiments of the present invention;

[0057] Figure 3 Schematically showing the workflow diagram of a highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms provided in the embodiments of the present invention;

[0058] Figure 4 Schematically showing the flowchart of a highly sensitive anti-interference satellite navigation signal receiving method based on Rydberg atoms provided in the embodiments of the present invention.

[0059] Among them, the corresponding relationship between the component names and the reference numerals is as follows:

[0060] 1. Signal detection unit; 2. Data receiving unit; 3. Power supply unit;

[0061] 11. Patch antenna; 12. Micro atomic gas cell; 13. Detection laser; 14. Coupling laser; 15. Photoelectric detector; 16. Pump laser;

[0062] 21. A / D conversion module; 22. FPGA device;

[0063] a. Detection laser; b. Coupling laser; c. Pump laser. Specific embodiments

[0064] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0065] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. The embodiments cannot be enumerated one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0066] As Figure 1 and Figure 2 shown, a highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms of the present invention includes:

[0067] A signal detection unit 1 for receiving a satellite navigation direct signal and outputting an electrical signal;

[0068] A data receiving unit 2 for performing signal processing on the electrical signal output by the signal detection unit 1 and outputting a navigation message;

[0069] A power distribution unit 3 for providing power to the signal detection unit and the data receiving unit.

[0070] The signal detection unit 1 includes an atomic antenna, an optical path system, and a patch antenna 11. The atomic antenna includes four micro atomic cells 12 with the characteristics of long lifetime and high performance. The micro atomic cells 12 are filled with alkali metal vapor. The four micro atomic cells 12 form an atomic antenna array for receiving satellite navigation direct signals from different directions. The patch antenna 11 is arranged on one side of the micro atomic cell 12 for providing a local oscillator microwave signal to the micro atomic cell to realize superheterodyne high-sensitivity microwave signal reception.

[0071] The optical path system is used to provide counter-propagating probe laser and coupling laser to the micro atomic cell 12 to excite the atoms in the micro atomic cell 12 from the first low energy level state |1> to the first Rydberg state |3>. Among them, the probe laser excites the atoms from the first low energy level state |1> to the second low energy level state |2>, and the coupling laser excites the atoms from the second low energy level state |2> to the first Rydberg state |3>.

[0072] The optical path system includes a detection laser 13, a coupling laser 14, a photodetector 15, and an optical path system control device. The detection laser 13 and the coupling laser 14 are connected to the micro atomic gas cell 12 through optical fibers, and are used to provide detection laser and coupling laser to the micro atomic gas cell 12. The detection laser 13 and the coupling laser 14 include devices such as an acousto-optic modulator, a half-wave plate, and a Glan-Taylor prism. After adjustment, they are coupled into the optical fiber and transmitted through the optical fiber in the opposite direction to enter the micro atomic gas cell 12. A laser frequency stabilization device (not shown in the figure) is used to modulate the detection laser 13 and the coupling laser 14 to output a laser beam with an ultra-narrow linewidth; the detection laser and the coupling laser are laser beams with an ultra-narrow linewidth and a linewidth stabilized below 100 Hz. The photodetector 15 is arranged in one-to-one correspondence with the micro atomic gas cell 12, and is used to receive the optical signal passing through the micro atomic gas cell 12, convert the received optical signal into an electrical signal, and output it to the data receiving unit 2. The optical path system control device is used to control the detection laser 13, the coupling laser 14, the laser frequency stabilization device, and the photodetector 15 to work and check their working states.

[0073] The optical path system further includes a pump laser 16. The pump laser 16 is connected to the micro atomic gas cell 12 through an optical fiber, and is used to output pump laser to the micro atomic gas cell 12, exciting the atoms in the micro atomic gas cell 12 from the third lowest energy level state |1’> to the fourth lowest energy level state |2’>. The atoms in the fourth lowest energy level state |2’> can spontaneously radiate and transition to the first lowest energy level state |1>. The pump laser and the detection laser are arranged on the same side of the micro atomic gas cell at the input end of the micro atomic gas cell. After passing through the micro atomic gas cell 12, the pump laser and the detection laser are output to the photoelectric sensor 15 through the optical fiber.

[0074] The data receiving unit 2 includes an A / D conversion module 21, a baseband signal processing module, and a navigation solution module. The baseband signal processing module and the navigation solution module are implemented by an FPGA device 22. The A / D conversion module 21 can convert the electrical signal into a digital signal of discrete time; the baseband signal processing module can perform signal acquisition and tracking on the digital signal, and then through the navigation solution module, according to the processing result of the baseband signal processing module, calculate the satellite navigation signal measurement value and demodulate the navigation message; the satellite navigation signal measurement value includes pseudorange and carrier phase.

[0075] As Figure 3 and 4 shown, the present invention also provides a method for receiving satellite navigation signals using the above-mentioned highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms, including the following steps:

[0076] Step S1, power on through the power distribution unit to perform system initialization and detection preparation;

[0077] In step S1, it specifically includes:

[0078] Step S11: Power the signal detection unit and the data reception and processing unit through the power distribution unit, and perform system initialization;

[0079] After the system initialization is completed, it enters the waiting state, and the navigation signal detection process can be started according to the received navigation signal detection instruction.

[0080] Step S12: According to the received navigation signal detection instruction, determine the working states of the laser, the laser frequency stabilization device, and the photodetector through the optical path system control device, and judge whether the laser emission condition is satisfied. If it is satisfied, execute step S2.

[0081] Step S2: Perform wavelength tuning of the probing laser and the coupling laser through the optical path system and the atomic antenna;

[0082] The probing laser laser and the coupling laser laser are turned on. After the probing laser and the coupling laser are adjusted by devices such as an acousto-optic modulator, a half-wave plate, and a Glan-Taylor prism, they are coupled into the optical fiber and incident on the miniature atomic gas cell in opposite directions. The probing laser input into the miniature atomic gas cell passes through the satellite atomic gas cell and is then coupled out through the optical fiber to the photodetector.

[0083] Step S3: Perform laser frequency stabilization of the probing laser and the coupling laser through the optical path system;

[0084] The laser frequency stabilization device uses the ultra-stable cavity PDH locking technology based on sideband modulation to achieve high-precision laser frequency stabilization, and at the same time realizes high-speed fine adjustment of the output laser frequency. Finally, the linewidths of the probing laser and the coupling laser are stabilized to below 100 Hz, and a laser beam with an ultra-narrow linewidth is obtained; The Rydberg atoms in the atomic bubble are excited from the first low energy level state |1> to the high energy level state |3> by the probing laser and the coupling laser.

[0085] Step S4: Provide a local oscillator microwave signal to the miniature atomic gas cell through the patch antenna to excite the atoms to the Rydberg state;

[0086] In step S4, it specifically includes:

[0087] Step S41: Output a local oscillator microwave signal to the miniature atomic gas cell through the patch antenna. The local oscillator microwave signal is coupled with the atoms in the miniature atomic gas cell to achieve superheterodyne high-sensitivity microwave signal reception;

[0088] Step S42: Output a pump laser to the miniature atomic gas cell through the pump laser in the optical path system to excite the atoms in the miniature atomic gas cell from the third low energy level state |1'> to the fourth low energy level state |2'>.

[0089] Step S5: Based on the electromagnetically induced transparency effect and the Autler-Townes (AT) splitting effect, use four non-coplanar micro atomic cells to optically measure the navigation signals in different directions of the same target in the environment, and obtain the electrical signals of the navigation signals.

[0090] Use electromagnetically induced transparency (EIT) and Autler-Townes (AT) splitting to perform highly sensitive optical measurement on the navigation signals in the environment. Use an integrated atomic cell to multiply the navigation radio frequency signal processed by the data receiving unit and the local oscillator signal generated locally, and then filter out the high-frequency components in the product through the narrow linewidth characteristic of the EIT spectral line, and directly down-convert the carrier signal to the intermediate frequency. Through atomic demodulation technology, convert the EIT-AT spectral signal into an electrical signal, so as to realize highly sensitive detection of Rydberg atoms.

[0091] Step S6: Process the electrical signals of the navigation signals through the data receiving unit and output the navigation message.

[0092] In step S6, it specifically includes:

[0093] Step S61: After performing analog-to-digital (A / D) conversion through the A / D conversion module, convert the analog signal into a digital signal of discrete time.

[0094] Step S62: Process the data through the FPGA device, use the output digital signal as the input quantity of the subsequent baseband digital signal processing module, complete signal acquisition and tracking; obtain measurement values such as satellite navigation pseudorange and carrier phase through corresponding calculations, and demodulate the navigation message.

[0095] In atomic superheterodyne measurement, the local oscillator microwave signal and the microwave signal to be measured act on the Rydberg atoms simultaneously, causing two microwave signals with a certain frequency difference to mix at the atoms, resulting in periodic Rabi oscillations in the eigenenergy levels of the second Rydberg state, whose phase depends on the relative phase between the local oscillator signal field and the signal field to be measured, and can be measured through experiments.

[0096] In the present invention, use 4 non-coplanar atomic cells to obtain the phase information of the target signal through the atomic superheterodyne measurement method, and calculate the incident wave angle by back-calculating the phase difference of the same signal received at different positions. The specific calculation formula is as follows:

[0097]

[0098] Where: θ represents the target azimuth angle, Δd represents the interval distance between the atomic cells, is the phase difference measured by the atomic cells at different positions, and λ is the wavelength of the signal to be measured.

[0099] In addition, it should be noted that the present invention can be provided as a method, apparatus, or computer program product. Therefore, embodiments of the present invention can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, embodiments of the present invention can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0100] Embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing terminal device generate a device for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0101] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing terminal device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks. These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device, such that a series of operation steps are executed on the computer or other programmable terminal device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable terminal device provide steps for implementing the functions specified in Figure 1 one or more of the flows Figure 1 or blocks or the combination of blocks.

[0102] It should also be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising the said element. Finally, it should be noted that the above is the preferred embodiment of the present invention. It should be pointed out that although the preferred embodiments of the present invention have been described, for those skilled in the art of this technology, once the basic creative concept of the present invention is known, several improvements and refinements can be made without departing from the principle described in the present invention, and these improvements and refinements should also be regarded as the protection scope of the present invention. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

Claims

1. A highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms, characterized in that, Comprising: A signal detection unit, configured to receive a direct satellite navigation signal and output an electrical signal; A data receiving unit, configured to perform signal processing on the electrical signal output by the signal detection unit and output navigation telegrams; A power distribution unit, configured to supply power to the signal detection unit and the data receiving unit; The signal detection unit includes: An atomic antenna, including four non-coplanar micro atomic cells, configured to receive direct satellite navigation signals from different directions; An optical path system, configured to provide detection laser and coupling laser to the micro atomic cell to excite the atoms in the micro atomic cell from a first low energy level state to a high energy level state; A patch antenna, disposed on one side of the micro atomic cell, configured to provide a local oscillator microwave signal to the micro atomic cell to achieve superheterodyne high-sensitivity microwave signal reception.

2. The highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms according to claim 1, wherein The optical path system includes: A detection laser laser and a coupling laser laser, connected to the micro atomic cell through an optical fiber, configured to provide the detection laser and the coupling laser to the micro atomic cell; A laser frequency stabilization device, configured to stabilize the frequencies of the detection laser laser and the coupling laser, and output a laser beam with an ultra-narrow line width; An optical detector, disposed in one-to-one correspondence with the micro atomic cell, configured to receive the optical signal passing through the micro atomic cell, convert the received optical signal into an electrical signal, and output it to the data receiving unit; An optical path system control device, configured to control the detection laser laser, the coupling laser laser, the laser frequency stabilization device, and the optical detector to operate and check their operating states.

3. The highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms according to claim 2, wherein The optical path system further includes: A pump laser, connected to the micro atomic cell through an optical fiber, configured to output pump laser to the micro atomic cell to excite the atoms in the micro atomic cell from a third low energy level state to a fourth low energy level state, and the atoms in the fourth low energy level state can spontaneously radiate and transition to the first low energy level state; The pump laser and the detection laser are disposed on the same side of the micro atomic cell at the input end of the micro atomic cell, and after passing through the micro atomic cell, the pump laser and the detection laser are output to the optical sensor through an optical fiber.

4. The highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms according to claim 1, wherein, The data receiving unit includes: An A / D conversion module, configured to convert the electrical signal into a digital signal of discrete time; A baseband signal processing module, configured to perform signal acquisition and tracking on the digital signal; A navigation solution module, configured to calculate a satellite navigation signal measurement value according to the processing result of the baseband signal processing module and demodulate the navigation telegram; the satellite navigation signal measurement value includes a pseudorange and a carrier phase.

5. The highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms according to claim 4, wherein The detection laser and the coupling laser are laser beams with an ultra-narrow line width whose line width is stabilized below 100 Hz.

6. A satellite navigation signal receiving method, implemented based on the highly sensitive anti-interference satellite navigation signal receiving system based on Rydberg atoms as described in any one of claims 1 to 5, characterized in that, Including the following steps: Step S1, powered by the power distribution unit, perform system initialization and detection preparation; Step S2, perform wavelength tuning of the detection laser and the coupling laser through the optical path system and the atomic antenna; Step S3, perform laser frequency stabilization of the detection laser and the coupling laser through the optical path system; Step S4: Provide a local oscillator microwave signal to the micro atomic gas cell through the patch antenna to achieve superheterodyne high-sensitivity microwave signal reception; Step S5: Based on the electromagnetically induced transparency effect and the AT splitting effect, use the four micro atomic gas cells to optically measure the navigation signals in different directions of the same target in the environment, and obtain the electrical signals of the navigation signals; Step S6: Process the electrical signals of the navigation signals through the data receiving unit and output navigation telegrams.

7. The method according to claim 6, characterized in that, In the step S1, it specifically includes: Step S11: Power the signal detection unit and the data receiving and processing unit through the power distribution unit and perform system initialization; Step S12: According to the received navigation signal detection instruction, judge whether the laser emission condition is satisfied. If it is satisfied, execute step S2.

8. The method according to claim 6, wherein In the step S2, it specifically includes: Output the detection laser and the coupling laser through the detection laser laser and the coupling laser laser in the optical path system respectively. After being input into the micro atomic gas cell through the optical fiber, they are incident on the micro atomic gas cell in opposite directions; the detection laser passes through the micro atomic gas cell and is then coupled and output to the photodetector in the optical path system through the optical fiber; In the step S3, it specifically includes: Stabilize the frequencies of the detection laser laser and the coupling laser laser through the laser frequency stabilization device in the optical path system, so that the line widths of the detection laser and the coupling laser are stabilized below 100 Hz.

9. The method according to claim 6, wherein In the step S4, it specifically includes: Step S41: Output a local oscillator microwave signal to the micro atomic gas cell through the patch antenna. The local oscillator microwave signal is coupled with the atoms in the micro atomic gas cell to achieve superheterodyne high-sensitivity microwave signal reception; Step S42: Output pump laser to the micro atomic gas cell through the pump laser in the optical path system, so that the atoms in the micro atomic gas cell are excited from the third lowest energy level state to the fourth lowest energy level state.

10. The method according to claim 6, wherein In the step S5, use the micro atomic gas cell to obtain the phase information of the navigation signal through the atomic superheterodyne measurement method, and calculate the incoming wave angle by back-calculating the phase difference of the same signal received by the micro atomic gas cells at different positions. The specific calculation formula is as follows: Where: θ represents the target azimuth angle, and Δd represents the interval distance of the atomic gas cell. is the phase difference measured by atomic gas cells at different positions, and λ is the wavelength of the signal to be measured.

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