Microwave photon radar ranging device based on quantum compressed sensing

Abstract

The utility model discloses a microwave photon radar ranging device based on quantum compressed sensing, which belongs to the technical field of microwave ranging and comprises an electrical module, an optical module and a data analysis module. The electrical module comprises a signal generating unit used for generating a linear frequency modulation signal and a signal transmitting unit, the linear frequency modulation signal is divided into two paths through a three-way adapter, one path serves as a reference signal and is converted into a reference optical signal through a phase modulator, and the other path serves as a detection signal and is transmitted to a free space through the signal transmitting unit; the optical module comprises a signal receiving unit; and the data analysis module comprises a data acquisition unit and a data processing unit. According to the microwave photon radar ranging device based on quantum compressed sensing, the receiving end adopts the lithium niobate electric field sensor to replace a receiving antenna, the size is light, the sensitivity is high, the measurement bandwidth can reach 20GHz, the device is not influenced by the wavelength size effect, and the size of the radar is reduced under the condition that the ranging precision is not reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave ranging, in particular to a microwave photon radar ranging device based on quantum compressed sensing. Background Art

[0002] Microwave photon radars can generate high-definition, wide-bandwidth arbitrary waveform signals. Beamforming based on optical true delay can overcome challenges such as beam tilt and aperture crossing in traditional phased arrays. Furthermore, microwave photon radars offer potential advantages over traditional electronic radars, such as low transmission loss, lightweight, and resistance to electromagnetic interference. Therefore, radars based on microwave photon technology can effectively overcome several technical bottlenecks of traditional electronic devices, improve and enhance the performance of many traditional radar technologies, and revolutionize the technology and form factors of radar and other electronic equipment. However, the receiving antennas commonly used in existing technologies to receive echo signals are bulky, limiting their use in confined spaces and making them impractical for use in small spaces. Furthermore, with the trend towards integrated design, receiving antennas hinder the miniaturization and integration of radars. Receiving antennas are also affected by wavelength size effects. The matching of antenna size with the operating wavelength affects the antenna's radiation characteristics and gain. Antennas for receiving high- and low-frequency signals require different dimensions, resulting in a lack of a universal receiving device. Utility Model Content

[0003] The purpose of the utility model is to provide a microwave photon radar ranging device based on quantum compressed sensing to solve the problems existing in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides a microwave photon radar ranging device based on quantum compressed sensing, which includes an electrical module, an optical module and a data analysis module;

[0005] The electrical module includes a signal generating unit and a signal transmitting unit for generating a linear frequency modulation signal. The linear frequency modulation signal is divided into two paths through a three-way adapter. One path is converted into a reference optical signal by a phase modulator as a reference signal, and the other path is transmitted into free space by the signal transmitting unit as a detection signal to detect the target object.

[0006] The optical module includes a signal receiving unit for receiving a reflected signal from a target object, the signal receiving unit includes a 1550nm laser source and a lithium niobate electric field sensor, and the lithium niobate electric field sensor converts the echo signal of the target object into an echo light signal;

[0007] The data analysis module includes a data acquisition unit and a data processing unit.

[0008] Preferably, the signal generating unit includes a signal generator, a voltage-controlled oscillator and a DC source. The signal generator provides a sawtooth wave signal as a tuning voltage for the voltage-controlled oscillator. The voltage-controlled oscillator generates a linear frequency modulation signal under the modulation of the sawtooth wave signal. The DC source provides a working power supply for the voltage-controlled oscillator to ensure its normal operation. The output end of the voltage-controlled oscillator is divided into two paths, one path is connected to the signal transmitting unit, and the other path is connected to the phase modulator.

[0009] Preferably, the signal transmitting unit includes a power amplifier and a transmitting antenna, the input end of the power amplifier is connected to one output end of the voltage-controlled oscillator, the output end of the power amplifier is connected to the input end of the transmitting antenna, and the transmitting antenna transmits the detection signal into free space to detect the target object.

[0010] Preferably, the data acquisition unit includes an adjustable optical attenuator, a single photon detector and a time interval analyzer, the output end of the adjustable optical attenuator is connected to the input end of the single photon detector, the output end of the single photon detector is connected to the input end of the time interval analyzer, and the output end of the time interval analyzer is connected to the data processing unit.

[0011] Preferably, the reference optical signal and the echo optical signal are beat by a beam combiner to output a beat optical signal having a frequency difference between the reference optical signal and the echo optical signal, and then connected to the input end of the adjustable optical attenuator.

[0012] Preferably, the phase modulator and the lithium niobate electric field sensor both use the 1550 nm laser source.

[0013] Therefore, the present invention adopts a microwave photon radar ranging device based on quantum compressed sensing using the above structure, which has the following beneficial effects:

[0014] (1) By correctly connecting the signal generating unit, signal transmitting unit, signal receiving unit, data acquisition unit and data processing unit, and debugging them correctly, the transmitting antenna and the lithium niobate electric field sensor are aligned with the target object to conduct a ranging experiment in an interference-free environment, and relatively accurate distance information can be obtained;

[0015] (2) By using a voltage-controlled oscillator to generate a linear frequency modulation signal, the bandwidth of the linear frequency modulation signal can reach up to 800MHz, which can achieve long-distance detection;

[0016] (3) By using lithium niobate electric field sensors to replace the receiving antenna, the lithium niobate electric field sensors are small and light, and have high detection sensitivity, which expands the application scenarios of radar. Moreover, they are not affected by the wavelength size effect and can support a larger bandwidth, reducing the size of the radar without reducing the ranging accuracy.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a microwave photon radar ranging device based on quantum compressed sensing in the present utility model;

[0019] Figure 2 This is a schematic diagram of the spectrum at a distance of 1m according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the spectrum at a distance of 2m according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the spectrum at a distance of 3m according to an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the spectrum at a distance of 4m according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the spectrum at a distance of 5m according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the spectrum at a distance of 6m according to an embodiment of the present invention;

[0025] Figure 8 This is a fitting result diagram of an embodiment of the present utility model;

[0026] Reference numerals

[0027] 1. Signal generating unit; 11. Signal generator; 12. Voltage-controlled oscillator; 13. DC source; 2. Signal transmitting unit; 21. Power amplifier; 22. Transmitting antenna; 3. Signal receiving unit; 31. 1550nm laser source; 32. Lithium niobate crystal sensor; 4. Data acquisition unit; 41. Adjustable optical attenuator; 42. Single-photon detector; 43. Time interval analyzer; 5. Data processing unit; 6. Phase modulator; 7. Beam combiner; 8. Target object. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model is further described below through the accompanying drawings and embodiments.

[0029] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the usual meanings understood by persons of ordinary skill in the field to which this utility model belongs. The words "first", "second" and similar terms used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] Example

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings.

[0032] like Figure 1 As shown, a microwave photon radar ranging device based on quantum compressed sensing includes an electrical module, an optical module and a data analysis module; the electrical module includes a signal generating unit 1 and a signal transmitting unit 2, the signal generating unit 1 generates a signal whose frequency changes linearly with time, also called a linear frequency modulation signal, and the linear frequency modulation signal is divided into two paths through a three-way adapter, one path is converted into a reference light signal by a phase modulator 6 as a reference signal to beat the echo light signal, and the other path is transmitted into free space through the signal transmitting unit 2 to measure the distance of the target object 8; the signal generating unit 1 includes a signal generator 11, a voltage-controlled oscillator 12 and a DC source 13, the signal generator 11 generates a sawtooth wave signal to modulate the voltage-controlled oscillator 12, the DC source 13 supplies power to the voltage-controlled oscillator 12 to ensure its normal operation, the voltage-controlled oscillator 12 generates a linear frequency modulation signal under the modulation of the sawtooth wave signal, and the linear frequency modulation signal is divided into two paths, one path is input into the signal transmitting unit 2 as a detection signal, and the other path is input into the phase modulator 6 as a reference signal. The signal transmitting unit 2 includes a power amplifier 21 and a transmitting antenna 22. The linear frequency modulation signal power generated by the voltage-controlled oscillator 12 is relatively low, and the power of the detection signal after beam splitting will be reduced. Therefore, the detection signal passes through the power amplifier 21 to amplify the output power, and then is transmitted into the free space through the transmitting antenna 22. The detection signal reflects the echo signal after detecting the target object 8.

[0033] The optical module includes a signal receiving unit 3, which receives the signal reflected by the target object 8. The signal receiving unit 3 includes a 1550nm laser source 31 and a lithium niobate electric field sensor 32. The lithium niobate electric field sensor 32 uses the 1550nm laser source 31 to modulate the received echo signal onto the 1550nm laser, so that the echo signal can be converted into an echo light signal and beat with the reference light signal. The phase modulator 6 converts the reference signal into a reference light signal. The phase modulator 6 uses the 1550nm laser source 31. The combiner 7 beats the reference light signal with the echo light signal. The beat light signal has a frequency difference between the two beams.

[0034] The data analysis module includes a data acquisition unit 4 and a data processing unit 5. The data acquisition unit 4 includes an adjustable optical attenuator 41, a single-photon detector 42 and a time interval analyzer 43. The adjustable optical attenuator 41 attenuates the beat frequency optical signal to the single-photon level, and the attenuated optical signal is input into the single-photon detector 42. The single-photon detector 42 records the number of photons. The time interval analyzer 43 collects the number of photons recorded by the single-photon detector 42 to generate a time series of the beat frequency signal, and then transmits the generated time series to the data processing unit 5. The data processing unit 5 uses an existing computer program with registration number 2022SR1403567 to process the time series, restore the frequency domain information of the beat frequency signal, and generate a spectrum diagram. The distance information of the target object 8 can be calculated through the spectrum diagram.

[0035] like Figure 2-7 The frequency spectrum at a distance of 1m-6m is shown. The modulation period T of the linear frequency modulation signal used is 10 -4 s, bandwidth B is 370MHz, according to the formula Calculate the beat frequency f at a distance of 1m-6m b They are 24.67kHz, 49.3kHz, 74kHz, 98.7kHz, 123.3kHz, and 148kHz respectively. Figure 2-7 The actual measured value shown is very close to the theoretical value calculated using the formula. Within the allowable error range, the distance information of the target object can be recovered. However, as the distance increases, the signal-to-noise ratio of the beat frequency signal gradually decreases. Figure 8 As shown in the fitting result graph, the ranging results obtained at different distances change approximately linearly, indicating that the ranging accuracy of the system is good.

[0036] Therefore, the utility model adopts a microwave photon radar ranging device based on quantum compressed sensing with the above structure. The receiving end adopts a lithium niobate electric field sensor instead of the receiving antenna. The lithium niobate electric field sensor is lightweight, highly sensitive, and has a measurement bandwidth of up to 20GHz. It is not affected by the wavelength size effect, and the volume of the radar is reduced without reducing the ranging accuracy.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A microwave photon radar ranging device based on quantum compressed sensing, characterized by: Includes electrical module, optical module and data analysis module; The electrical module includes a signal generating unit and a signal transmitting unit for generating a linear frequency modulation signal. The linear frequency modulation signal is divided into two paths through a three-way adapter. One path is converted into a reference optical signal by a phase modulator as a reference signal, and the other path is transmitted into free space by the signal transmitting unit as a detection signal. The optical module includes a signal receiving unit for receiving a reflected signal from a target object, the signal receiving unit includes a 1550nm laser source and a lithium niobate electric field sensor, and the lithium niobate electric field sensor converts the echo signal of the target object into an echo light signal; The data analysis module includes a data acquisition unit and a data processing unit.

2. The microwave photon radar ranging device based on quantum compressed sensing according to claim 1, characterized in that: The signal generating unit includes a signal generator, a voltage-controlled oscillator and a DC source. The signal generator provides a tuning voltage for the voltage-controlled oscillator to control the bandwidth and amplitude of the signal generated by the voltage-controlled oscillator. The DC source provides an operating power supply for the voltage-controlled oscillator. The output end of the voltage-controlled oscillator is divided into two paths, one path is connected to the signal transmitting unit, and the other path is connected to the phase modulator.

3. The microwave photon radar ranging device based on quantum compressed sensing according to claim 2, characterized in that: The signal transmitting unit includes a power amplifier and a transmitting antenna. The input end of the power amplifier is connected to one output end of the voltage-controlled oscillator, and the output end of the power amplifier is connected to the input end of the transmitting antenna. The transmitting antenna transmits the detection signal into free space to detect the target object.

4. The microwave photon radar ranging device based on quantum compressed sensing according to claim 3, characterized in that: The data acquisition unit includes an adjustable optical attenuator, a single photon detector and a time interval analyzer. The output end of the adjustable optical attenuator is connected to the input end of the single photon detector, the output end of the single photon detector is connected to the input end of the time interval analyzer, and the output end of the time interval analyzer is connected to the data processing unit.

5. The microwave photon radar ranging device based on quantum compressed sensing according to claim 4, characterized in that: The reference optical signal and the echo optical signal are beat by each other through a beam combiner, and the beat optical signal is output and connected to the input end of the adjustable optical attenuator.

6. The microwave photon radar ranging device based on quantum compressed sensing according to claim 1, characterized in that: The phase modulator and the lithium niobate electric field sensor both use the 1550nm laser source.

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