Sensitivity and inductance integrated radar device and method based on microwave photon technology

Abstract

The invention discloses a microwave photon technology-based communication and induction integrated radar device and method. The radar device comprises a radar transmitting end, a radar receiving end and a communication demodulation end, the radar transmitting end is used for loading the communication signal into a frequency spectrum of a radar signal and generating and transmitting the radar signal containing the communication signal; the radar receiving end receives radar signals reflected by an object, processes the radar signals and inputs the processed radar signals into the computer for processing and calculation; and the communication demodulation end receives the radar signal and obtains a communication signal in the radar signal, and the computer processes and demodulates the communication signal. According to the invention, on the basis of the microwave photon technology, the sensing integrated radar is realized, the high-frequency broadband signal is obtained by using the low-frequency narrowband signal, and the communication signal is loaded to the frequency spectrum of the radar signal through the frequency division multiplexing technology, so that radar communication integration without occupying extra frequency spectrum resources is realized, the frequency spectrum utilization rate is improved, the system cost is reduced, and the system performance is improved. And meanwhile, the technical advantages of a microwave photon radar are also realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of synesthesia radar, and in particular relates to a synesthesia radar device and method based on microwave photon technology. Background Art

[0002] Traditional radar systems use microwave signals to detect and track targets. However, microwave signals are susceptible to signal attenuation, noise and interference during long-distance transmission. In addition, due to the limited frequency range of microwave signals, radar resolution and detection capabilities are subject to certain restrictions.

[0003] Radar technology based on microwave photonic technology combines the advantages of microwave and optical technologies to achieve high-performance radar applications. Photonic technology utilizes the high frequency and low loss characteristics of optical signals to enhance the performance of radar systems and provide higher resolution and sensitivity. However, the existing radar solutions based on microwave photonic technology have too low working bandwidth, only about 2GHz, and low spectrum resource utilization. Secondly, existing technical solutions generally use intensity modulation, which is susceptible to interference in the working environment, resulting in unstable signal transmission. Summary of the invention

[0004] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a synaesthesia radar device and method based on microwave photon technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The integrated radar device based on microwave photon technology includes a radar transmitter, a radar receiver and a communication demodulator;

[0007] The radar transmitter loads the communication signal into the spectrum of the radar signal, generates and transmits the radar signal containing the communication signal;

[0008] The radar receiver receives the radar signal reflected by the object and inputs it into the computer for processing and calculation after processing;

[0009] The communication demodulation end receives the radar signal and obtains the communication signal therein, and the computer processes and demodulates the communication signal.

[0010] Further, the radar transmitting end specifically includes a first light source, a first electro-optical modulator, a first optical filter, an optical amplifier, a first optical coupler, a second optical coupler, a second optical filter, an IQ modulator, a signal source, a third optical coupler, a first photodetector, a first electric amplifier, and a radar transmitting antenna;

[0011] Wherein, the first light source, the first electro-optic modulator, the first optical filter, the optical amplifier, the first optical coupler, and the second optical coupler are sequentially connected by optical fibers;

[0012] The second optical coupler outputs two paths, one optical fiber is connected to the second optical filter, and the other optical fiber is connected to the third optical coupler;

[0013] The second optical filter, the IQ modulator, the third optical coupler and the first photoelectric detector are connected in sequence by optical fiber, and the first photoelectric detector, the first electrical amplifier and the radar transmitting antenna are connected in sequence by circuit;

[0014] The signal source is connected to the first electro-optic modulator and the IQ modulator circuit respectively. The signal source generates a linear frequency modulation signal which is input into the first electro-optic modulator and generates a communication signal which is input into the IQ modulator.

[0015] Further, the radar receiving end specifically includes a radar receiving antenna, a second electrical amplifier, a second electro-optical modulator, a second photoelectric detector, a first electrical filter, a digital-to-analog converter, and a first computer;

[0016] The radar receiving antenna, the second electrical amplifier and the second electro-optical modulator are connected in sequence;

[0017] The second photodetector, the first electric filter, the digital-to-analog converter and the first computer are connected in series;

[0018] The second electro-optic modulator is connected to the second photodetector optical fiber.

[0019] Furthermore, the first optical coupler is also connected to the second electro-optical modulator via an optical fiber, and a reference signal of the radar receiving end is input to the second electro-optical modulator.

[0020] Further, the communication demodulation end specifically includes a communication receiving antenna, a third electrical amplifier, a second light source, a third electro-optical modulator, a third optical filter, a third photodetector, a second electrical filter, a fourth electrical amplifier, a mixer, a second computer and a signal source;

[0021] The communication receiving antenna, the third electrical amplifier, and the third electro-optical modulator are sequentially connected in circuit;

[0022] The third photodetector, the second electric filter, the fourth electric amplifier, the mixer and the second computer are connected in sequence;

[0023] The second light source, the third electro-optic modulator, the third optical filter, and the third photodetector are sequentially connected by optical fibers;

[0024] The signal source is connected to the mixer circuit to generate a local oscillator signal which is input into the mixer.

[0025] The present invention also includes a detection and communication method based on the provided synesthesia radar device, the method comprising:

[0026] Radar signal transmission, loading the communication signal into the spectrum of the radar signal, generating and transmitting the radar signal containing the communication signal;

[0027] Radar signal reception: receiving radar signals reflected by objects, inputting them into computers for processing and calculation after processing, and obtaining the position information of the objects to be measured;

[0028] Communication demodulation, receiving radar signals and obtaining the communication signals therein, demodulating the communication signals through computer processing, and obtaining communication information.

[0029] Furthermore, the radar signal transmission specifically includes:

[0030] The first light source outputs a single-wavelength optical signal as an optical carrier;

[0031] The first electro-optic modulator modulates the linear frequency modulation signal generated by the signal source onto the optical signal, where the angular frequency of the light source is ω c , the central angular frequency of the modulation signal is ω rf , a plurality of sidebands are generated by the first electro-optic modulator; the first electro-optic modulator operates at different bias points to generate different sideband results to achieve frequency doubling; the first optical filter filters out low-order optical sidebands to obtain a high-frequency signal; the high-frequency signal is amplified by the optical amplifier and then divided into two paths after passing through the first optical coupler, one of which is further divided into an upper path and a lower path through the second optical coupler;

[0032] The +n-order sideband signal is selected by the second optical filter as the carrier of the communication path, and then input into the IQ modulator. The IQ modulator is made to work in the CS-SSB state, and the communication signal generated by the signal source is modulated on the ±1-order sideband. Then, the third optical coupler is used to merge the optical signal modulated by the communication signal and the two n-order optical sidebands of the lower path into the same path, and then the first photoelectric detector is used to beat the frequency to generate a radar signal containing the communication signal. After the radar signal is amplified by the first electrical amplifier, the radar transmitting antenna radiates the signal into the free space.

[0033] Furthermore, the other signal after passing through the first optical coupler is input into the second electro-optical modulator of the radar receiving end as a reference signal.

[0034] Furthermore, the radar signal reception specifically includes:

[0035] The radar signal is reflected by the object and received by the radar receiving antenna. The received radar signal is amplified by the second electrical amplifier and then loaded onto the second electro-optical modulator. The radar signal beats with the reference signal in the second photoelectric detector and then passes through the first electrical filter into the digital-to-analog converter. After being collected and processed by the digital-to-analog converter, it is input into the first computer for calculation and processing to obtain the position information of the object to be measured.

[0036] Furthermore, communication demodulation specifically includes:

[0037] The second light source emits laser light as a carrier wave, which is input into the third electro-optic modulator;

[0038] The radar signal is received by the communication receiving antenna, amplified by the third electrical amplifier and input into the third electro-optical modulator, and filtered out by the third optical filter. The communication signal generated by the intermodulation of the communication signal and the radar signal, the communication signal enters the third photodetector for photoelectric conversion, and then the communication band signal is selected by the second electrical filter, amplified by the fourth electrical amplifier and input into the mixer. At the same time, the signal source generates a local oscillator signal and inputs it into the mixer. After processing by the mixer, it is input into the second computer for digital signal processing to demodulate the communication signal and obtain communication information.

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] 1. The present invention realizes the inter-sensory radar based on microwave photon technology, and utilizes the frequency doubling technology of microwave photons to transform the low-frequency narrowband signal into the high-frequency broadband radar signal, so as to achieve the effects of six-fold and eight-fold frequency in light; by adding a communication signal in the microwave photon radar link, the communication signal is loaded onto the radar signal, frequency division multiplexing is realized, spectrum utilization is improved, and system cost is reduced; in communication reception, the intermodulation technology in microwave photons is utilized to restore the communication signal originally mixed in the radar signal to a low frequency, so as to realize high-quality signal demodulation, and realize high-speed communication at a low cost; the radar device of the present invention also has the technical advantages of microwave photon radar, such as large bandwidth, high resolution, long distance, and communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of the radar device of the present invention;

[0042] Explanation of the accompanying drawings: 1-first light source; 2-first electro-optical modulator; 3-first optical filter; 4-optical amplifier; 5-first optical coupler; 6-second optical coupler; 7-second optical filter; 8-IQ modulator; 9-third optical coupler; 10-first photodetector; 11-first electric amplifier; 12-second electro-optical modulator; 13-second electric amplifier; 14-first computer; 15-digital-to-analog converter; 16-first electric filter; 17-second photodetector; 18-third electric amplifier; 19-second light source; 20-third electro-optical modulator; 21-third optical filter; 22-third photodetector; 23-second electric filter; 24-fourth electric amplifier; 25-mixer; 26-local oscillator signal; 27-linear frequency modulation signal; 28-communication signal; 29-radar transmitting antenna; 30-radar receiving antenna; 31-communication receiving antenna; 32-second computer; 33-object to be measured. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0044] Example

[0045] like Figure 1 As shown, the present invention is a synaesthesia radar device based on microwave photon technology, including a radar transmitting end, a radar receiving end and a communication demodulation end;

[0046] The radar transmitter loads the communication signal into the spectrum of the radar signal, generates and transmits the radar signal containing the communication signal;

[0047] The radar receiver receives the radar signal reflected by the object and inputs it into the computer for processing and calculation after processing;

[0048] The communication demodulation end receives the radar signal and obtains the communication signal therein, and the computer processes and demodulates the communication signal.

[0049] In this embodiment, the radar transmitting end specifically includes a first light source 1, a first electro-optical modulator 2, a first optical filter 3, an optical amplifier 4, a first optical coupler 5, a second optical coupler 6, a second optical filter 7, an IQ modulator 8, a signal source, a third optical coupler 9, a first photodetector 10, a first electric amplifier 11 and a radar transmitting antenna 29;

[0050] Wherein, the first light source, the first electro-optic modulator, the first optical filter, the optical amplifier, the first optical coupler, and the second optical coupler are sequentially connected by optical fibers;

[0051] The second optical coupler outputs two paths, one optical fiber is connected to the second optical filter, and the other optical fiber is connected to the third optical coupler;

[0052] The second optical filter, the IQ modulator, the third optical coupler and the first photoelectric detector are connected in sequence by optical fiber, and the first photoelectric detector, the first electrical amplifier and the radar transmitting antenna are connected in sequence by circuit;

[0053] The signal source is connected to the first electro-optic modulator and the IQ modulator circuit respectively. The signal source generates a linear frequency modulation signal 27 which is input into the first electro-optic modulator and generates a communication signal 28 which is input into the IQ modulator.

[0054] In this embodiment, the radar receiving end specifically includes a radar receiving antenna 30, a second electrical amplifier 13, a second electro-optical modulator 12, a second photodetector 17, a first electrical filter 16, a digital-to-analog converter 15, and a first computer 14;

[0055] The radar receiving antenna, the second electrical amplifier and the second electro-optical modulator are connected in sequence;

[0056] The second photodetector, the first electric filter, the digital-to-analog converter and the first computer are connected in series;

[0057] The second electro-optic modulator is connected to the second photodetector optical fiber.

[0058] The first optical coupler is also connected to the second electro-optical modulator optical fiber, and inputs the reference signal of the radar receiving end to the second electro-optical modulator.

[0059] In this embodiment, the communication demodulation end specifically includes a communication receiving antenna 31, a third electrical amplifier 18, a second light source 19, a third electro-optical modulator 20, a third optical filter 21, a third photodetector 22, a second electrical filter 23, a fourth electrical amplifier 24, a mixer 25, a second computer 32 and a signal source;

[0060] The communication receiving antenna, the third electrical amplifier, and the third electro-optical modulator are sequentially connected in circuit;

[0061] The third photodetector, the second electric filter, the fourth electric amplifier, the mixer and the second computer are connected in sequence;

[0062] The second light source, the third electro-optic modulator, the third optical filter, and the third photodetector are sequentially connected by optical fibers;

[0063] The signal source is connected to the mixer circuit to generate a local oscillator signal 26 which is input into the mixer.

[0064] The radar device of this embodiment realizes radar communication integration, and its operation includes the following steps:

[0065] Radar signal transmission, loading the communication signal into the spectrum of the radar signal, generating and transmitting the radar signal containing the communication signal; in this embodiment, specifically:

[0066] The first light source outputs a single-wavelength optical signal as an optical carrier;

[0067] The first electro-optic modulator modulates the linear frequency modulation signal 27 generated by the signal source onto the optical signal, wherein the angular frequency of the light source is ω c (ω represents frequency, subscript c represents carrier wave), the central angular frequency of the modulated signal is ω rf(the subscript rf represents the radio frequency signal), a plurality of sidebands are generated by the first electro-optical modulator; the first electro-optical modulator operates at different bias points to generate different sideband results to achieve frequency doubling; the first optical filter filters out the low-order optical sidebands to obtain a high-frequency signal; the high-frequency signal is amplified by the optical amplifier and then divided into two paths after passing through the first optical coupler, one of which is further divided into an uplink path and a downlink path by passing through the second optical coupler;

[0068] The +n-order sideband signal of the upper path is selected by the second optical filter as the carrier of the communication path, and then input into the IQ modulator, so that the IQ modulator works in the CS-SSB state, and the communication signal 28 generated by the signal source is modulated on the ±1-order sideband. Then, the third optical coupler is used to merge the optical signal modulated by the communication signal and the two n-order optical sidebands of the lower path into the same path, and then the first photodetector is used to beat the frequency to generate a radar signal containing the communication signal. After the radar signal is amplified by the first electrical amplifier, the radar transmitting antenna radiates the signal into the free space.

[0069] Radar signal reception, receiving the radar signal reflected by the object, and inputting it into the computer for processing and calculation after processing to obtain the position information of the object to be measured 33; in this embodiment, specifically:

[0070] The radar signal is reflected by the object to be measured 33 and received by the radar receiving antenna. The received radar signal is amplified by the second electrical amplifier and then loaded onto the second electro-optical modulator. The radar signal beats with the reference signal in the second photodetector and then passes through the first electrical filter into the digital-to-analog converter. After being collected and processed by the digital-to-analog converter, it is input into the first computer for calculation and processing to obtain the position information of the object to be measured.

[0071] Communication demodulation, receiving radar signals and obtaining communication signals therein, demodulating the communication signals through computer processing, and obtaining communication information; in this embodiment, specifically:

[0072] The second light source emits laser light as a carrier wave, which is input into the third electro-optic modulator;

[0073] The radar signal is received by the communication receiving antenna, amplified by the third electrical amplifier and input into the third electro-optical modulator, and filtered out by the third optical filter. The communication signal generated by the intermodulation of the communication signal and the radar signal, the communication signal enters the third photodetector for photoelectric conversion, and then the communication band signal is selected by the second electrical filter, amplified by the fourth electrical amplifier and input into the mixer. At the same time, the signal source generates a local oscillator signal 26 and inputs it into the mixer. After being processed by the mixer, it is input into the second computer for digital signal processing (DSP) to demodulate the communication signal and obtain communication information.

[0074] It should also be noted that in this specification, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0075] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A synaesthesia radar device based on microwave photon technology, characterized in that: It includes radar transmitting end, radar receiving end and communication demodulation end; The radar transmitter loads the communication signal into the spectrum of the radar signal, generates and transmits the radar signal containing the communication signal; The radar receiver receives the radar signal reflected by the object and inputs it into the computer for processing and calculation after processing; The communication demodulation end receives the radar signal and obtains the communication signal therein, and the computer processes and demodulates the communication signal.

2. The synaesthesia radar device based on microwave photon technology according to claim 1 is characterized in that: The radar transmitting end specifically includes a first light source, a first electro-optical modulator, a first optical filter, an optical amplifier, a first optical coupler, a second optical coupler, a second optical filter, an IQ modulator, a signal source, a third optical coupler, a first photodetector, a first electric amplifier and a radar transmitting antenna; Wherein, the first light source, the first electro-optic modulator, the first optical filter, the optical amplifier, the first optical coupler, and the second optical coupler are sequentially connected by optical fibers; The second optical coupler outputs two paths, one optical fiber is connected to the second optical filter, and the other optical fiber is connected to the third optical coupler; The second optical filter, the IQ modulator, the third optical coupler and the first photoelectric detector are connected in sequence by optical fiber, and the first photoelectric detector, the first electrical amplifier and the radar transmitting antenna are connected in sequence by circuit; The signal source is connected to the first electro-optical modulator and the IQ modulator circuit respectively. The signal source generates a linear frequency modulation signal which is input into the first electro-optical modulator and generates a communication signal which is input into the IQ modulator.

3. The synaesthesia radar device based on microwave photon technology according to claim 2 is characterized in that: The radar receiving end specifically includes a radar receiving antenna, a second electrical amplifier, a second electro-optical modulator, a second photoelectric detector, a first electrical filter, a digital-to-analog converter and a first computer; The radar receiving antenna, the second electrical amplifier and the second electro-optical modulator are connected in sequence; The second photodetector, the first electric filter, the digital-to-analog converter and the first computer are connected in series; The second electro-optic modulator is connected to the second photodetector optical fiber.

4. The synaesthesia radar device based on microwave photon technology according to claim 3 is characterized in that: The first optical coupler is also connected to the second electro-optical modulator optical fiber, and inputs the reference signal of the radar receiving end to the second electro-optical modulator.

5. The synaesthesia radar device based on microwave photon technology according to claim 1 is characterized in that: The communication demodulation end specifically includes a communication receiving antenna, a third electric amplifier, a second light source, a third electro-optical modulator, a third optical filter, a third photodetector, a second electric filter, a fourth electric amplifier, a mixer, a second computer and a signal source; The communication receiving antenna, the third electrical amplifier, and the third electro-optical modulator are sequentially connected in circuit; The third photodetector, the second electric filter, the fourth electric amplifier, the mixer and the second computer are connected in sequence; The second light source, the third electro-optic modulator, the third optical filter, and the third photodetector are sequentially connected by optical fibers; The signal source is connected to the mixer circuit to generate a local oscillator signal which is input into the mixer.

6. The detection and communication method of the synesthesia radar device according to any one of claims 1 to 5, characterized in that: include: Radar signal transmission, loading the communication signal into the spectrum of the radar signal, generating and transmitting the radar signal containing the communication signal; Radar signal reception: receiving radar signals reflected by objects, inputting them into computers for processing and calculation after processing, and obtaining the position information of the objects to be measured; Communication demodulation, receiving radar signals and obtaining the communication signals therein, demodulating the communication signals through computer processing, and obtaining communication information.

7. The detection and communication method according to claim 6, characterized in that: Radar signal transmission specifically includes: The first light source outputs a single-wavelength optical signal as an optical carrier; The first electro-optic modulator modulates the linear frequency modulation signal generated by the signal source onto the optical signal, where the angular frequency of the light source is ω c , the central angular frequency of the modulation signal is ω rf , a plurality of sidebands are generated by the first electro-optic modulator; the first electro-optic modulator operates at different bias points to generate different sideband results to achieve frequency doubling; the first optical filter filters out low-order optical sidebands to obtain a high-frequency signal; the high-frequency signal is amplified by the optical amplifier and then divided into two paths after passing through the first optical coupler, one of which is further divided into an upper path and a lower path through the second optical coupler; The +n-order sideband signal is selected by the second optical filter as the carrier of the communication path, and then input into the IQ modulator. The IQ modulator is made to work in the CS-SSB state, and the communication signal generated by the signal source is modulated on the ±1-order sideband. Then, the third optical coupler is used to merge the optical signal modulated by the communication signal and the two n-order optical sidebands of the lower path into the same path, and then the first photoelectric detector is used to beat the frequency to generate a radar signal containing the communication signal. After the radar signal is amplified by the first electrical amplifier, the radar transmitting antenna radiates the signal into the free space.

8. The detection and communication method according to claim 6, characterized in that: The other signal after passing through the first optical coupler is input into the second electro-optical modulator at the radar receiving end as a reference signal.

9. The detection and communication method according to claim 7, characterized in that: Radar signal reception specifically includes: The radar signal is reflected by the object and received by the radar receiving antenna. The received radar signal is amplified by the second electrical amplifier and then loaded onto the second electro-optical modulator. The radar signal beats with the reference signal in the second photoelectric detector and then passes through the first electrical filter into the digital-to-analog converter. After being collected and processed by the digital-to-analog converter, it is input into the first computer for calculation and processing to obtain the position information of the object to be measured.

10. The detection and communication method according to claim 7, characterized in that: Communication demodulation specifically includes: The second light source emits laser light as a carrier wave, which is input into the third electro-optic modulator; The radar signal is received by the communication receiving antenna, amplified by the third electrical amplifier and input into the third electro-optical modulator, and filtered out by the third optical filter. The communication signal generated by the intermodulation of the communication signal and the radar signal, the communication signal enters the third photodetector for photoelectric conversion, and then the communication band signal is selected by the second electrical filter, amplified by the fourth electrical amplifier and input into the mixer. At the same time, the signal source generates a local oscillator signal and inputs it into the mixer. After processing by the mixer, it is input into the second computer for digital signal processing to demodulate the communication signal and obtain communication information.

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