A photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving

Abstract

The present invention discloses a photon terahertz communication perception integrated system with stepped frequency time slot interleaving, characterized in that it comprises a signal generating module, a signal modulating module, an integrated signal transmitting module, a communication receiving module, and a radar receiving module; wherein the signal generating module is used to insert a communication symbol in the timing gap of the stepped frequency signal to form a stepped frequency integrated signal and convert it into an analog signal for transmission; the signal modulating module is used to modulate the analog signal output by the signal generating module onto an optical carrier to form an optical carrier signal; the integrated signal transmitting module is used to convert the optical carrier signal into a terahertz integrated signal and transmit it; the communication receiving module is used to receive the terahertz integrated signal and demodulate and recover it to obtain communication information; the radar receiving module is used to receive the terahertz integrated signal and process it to obtain perception information. The system can realize the flexible configuration of system resources and greatly improve the spectrum utilization rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of wireless communications, and in particular relates to a photon terahertz communication and perception integrated system with stepped frequency time slot interleaving. Background Art

[0002] Wireless communication and wireless sensing are two of the most important applications in modern radio technology. Early communication systems and sensing systems worked in different frequency bands and used different waveform systems. For example, radar sensing systems generally work in millimeter wave bands and use specific forms of signals such as linear frequency modulation to detect and image targets, while wireless communication systems work in lower frequency bands and need to use the randomness of signals to transmit information. In recent years, with the increasing demand for bandwidth resources, wireless communication systems have gradually developed towards higher frequency bands of millimeter waves and terahertz waves, which overlap with the frequency bands of sensing systems. At the same time, the rapid increase in the number of wireless terminal users has also aggravated spectrum congestion. In order to overcome the increasingly complex electromagnetic environment, it is necessary to carry out research on integrated communication and sensing systems. The integrated system can not only alleviate spectrum congestion, but also reduce hardware resource consumption and improve system utilization efficiency. More importantly, the combination of communication and sensing is expected to improve the overall performance of the system. On the other hand, thanks to advanced digital signal processing technology, wireless communication and sensing systems can be implemented using similar hardware architectures, which also makes communication and sensing integration possible.

[0003] Relieving the pressure on spectrum resources requires exploring new frequency resources, such as millimeter waves, terahertz waves, and visible light. Terahertz waves refer to electromagnetic waves with a frequency of 0.1 to 10 THz, which can support high-speed communication at a rate of Tbit / s and high-precision perception with millimeter-level resolution. Compared with millimeter waves, terahertz waves can provide richer spectrum resources; compared with visible light, terahertz waves have a higher beam width and stronger penetration ability in dust and fog environments. Therefore, the terahertz frequency band can effectively deploy an integrated communication and perception system.

[0004] In terms of hardware implementation, the traditional all-electronic wireless system is simple to implement and has high radiation power, but the terahertz signal bandwidth obtained in this way is limited, and there is serious harmonic interference. The photonic terahertz system uses optoelectronic devices to generate, transmit and process signals, which can effectively overcome the above problems of the all-electronic system and effectively support large-bandwidth, low-loss terahertz systems. In summary, the integrated terahertz communication and perception system based on photonics has important research value and application potential.

[0005] According to literature search, Atsushi Kanno et al. from the National Institute of Information and Communications Technology (NICT) of Japan published an article titled "300-GHz versatile transceiver front-end for both communication and imaging" at the IRMMW-THz conference in 2015. The article is based on the principle of time division multiplexing, using linear frequency modulated continuous waves for target perception and on-off keying signals for communication. The modulated optical signal is selected by an optical switch, and a single-line carrier photodiode is used as a transmitter to generate terahertz signals, and a Schottky barrier diode is used as a receiver to receive terahertz signals. The system achieves a wireless communication rate of 1 Gbit / s and a distance resolution of 1.2 cm in the 300 GHz frequency band. However, the time switching of this scheme is not flexible enough, and it is just a stacking of two systems. In addition, communication and perception cannot work simultaneously in the system, and there are perception blind spots.

[0006] A literature search revealed that Yanyi Wang et al. from Fudan University published a paper titled "Joint communication and radar sensing functions system based on photonics at the W-band" in the journal Optics Express in 2022. This work is based on the principle of frequency division multiplexing and achieves 78Gbit / s 128QAM wireless transmission and 3cm distance resolution in the W band. The system reduces the hardware resource overhead and device consumption to a certain extent, but communication and perception use different waveforms and are modulated on different frequency bands, which seriously reduces the spectrum utilization efficiency. Summary of the invention

[0007] In view of the above, the purpose of the present invention is to provide an integrated photonic terahertz communication and perception system with stepped frequency time slot interleaving, which improves the stepped frequency signal in the traditional radar and combines it with the photonic terahertz wireless system to achieve flexible configuration of system resources and greatly improve spectrum utilization.

[0008] In order to achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0009] A photon terahertz communication and perception integrated system with stepped frequency time slot interpolation, comprising a signal generation module, a signal modulation module, an integrated signal transmission module, a communication receiving module, and a radar receiving module;

[0010] The signal generating module is used to insert communication symbols into the timing gap of the step frequency signal to form a step frequency integrated signal and convert it into an analog signal for transmission;

[0011] The signal modulation module is used to modulate the step frequency integrated signal output by the signal generation module onto the optical carrier to form an optical carrier signal;

[0012] The integrated signal transmission module is used to convert the optical carrier signal into a terahertz integrated signal and transmit it;

[0013] The communication receiving module is used to receive the terahertz integrated signal and demodulate and recover the communication information;

[0014] The radar receiving module is used to receive the terahertz integrated signal and process it to obtain the sensing information.

[0015] Preferably, the signal generating module comprises a step frequency signal generating module, a communication symbol inserting module, and an arbitrary signal generator module which are connected in sequence;

[0016] The step frequency signal generating module is used to generate N single frequency signals with a frequency interval of Δf, the duration of each single frequency signal is Tr, and the period of the single frequency signal is Tp, wherein Tp>Tr, N is any integer greater than or equal to 2, and Δf, Tr, Tp and N are all configurable;

[0017] The communication symbol insertion module is used to generate communication symbols with configurable modulation mode and baud rate, and divide the communication symbols into a series of chips with a duration of Tc, and then insert the chips into the idle time gaps in each cycle that do not overlap with the single-frequency signal in time, to form a stepped frequency integrated signal, wherein Tc = Tp-Tr;

[0018] The arbitrary signal generator module is used to convert the step frequency integrated signal into an analog signal of arbitrary waveform and send it out.

[0019] Preferably, the modulation format of the communication symbol includes a pulse amplitude modulation signal, an M-order phase modulation signal, an M-order quadrature amplitude modulation signal, a minimum shift keying signal, and an orthogonal frequency division multiplexing signal, wherein the value of M in the M-order phase modulation signal is a positive even number, and the value of M in the M-order quadrature amplitude modulation signal is a positive even number greater than or equal to 4;

[0020] The modulation format of the generated communication symbols is at least one of all the above modulation formats.

[0021] Preferably, the signal modulation module comprises a tunable laser 1, a polarization controller 1, and an optical modulator;

[0022] The tunable laser 1 is used to generate an optical signal;

[0023] The polarization controller 1 is used to change the polarization state of the optical signal to maximize the output power;

[0024] The optical modulator is used to modulate the step frequency integrated signal output by the signal generating module onto the optical signal with the largest output power to form an optical carrier signal and output it.

[0025] Preferably, the tunable laser 1 comprises an external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser;

[0026] The optical modulator includes a dual parallel Mach-Zehnder modulator.

[0027] Preferably, the integrated signal transmission module comprises an optical amplifier, an optical coupler, a polarization controller 2, an adjustable attenuator and a terahertz integrated transmitter connected in sequence, and also comprises a tunable laser 2;

[0028] The optical amplifier is used to amplify the optical carrier signal;

[0029] The tunable laser 2 is used to beat the amplified optical carrier signal to generate a terahertz signal, the frequency of the terahertz signal depends on the frequency difference between the tunable laser 1 and the tunable laser 2, and the power of the terahertz signal is consistent with the power of the amplified optical carrier signal;

[0030] The optical coupler is used to couple the amplified optical carrier signal and the terahertz signal into one path and output the signal;

[0031] The polarization controller 2 is used to adjust the polarization state of the optical signal output by the optical coupler so that the output photocurrent is maximized under the same optical power;

[0032] The adjustable attenuator is used to adjust the optical power of the optical signal output by the polarization controller 2;

[0033] The terahertz integrated transmitter is used to beat the optical signal output by the adjustable attenuator, generate a terahertz integrated signal with a frequency equal to the optical signal frequency difference, and transmit the signal.

[0034] Preferably, the optical amplifier comprises a semiconductor optical amplifier or an erbium-doped fiber amplifier;

[0035] The terahertz integrated emitter includes a single row of carrier photodetectors;

[0036] The tunable laser 2 includes an external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser.

[0037] Preferably, the communication receiving module comprises a terahertz signal receiver and a signal demodulation module which are connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal demodulation module is used to extract the communication symbol from the intermediate frequency signal, perform communication channel compensation, and restore the communication information of the transmitting end;

[0038] The radar receiving module includes a terahertz signal receiver and a signal processing module which are connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal processing module is used to perform signal processing based on the intermediate frequency signal and in combination with the analog signal output by the signal generating module to obtain perception information.

[0039] Preferably, the terahertz signal receiver comprises a subharmonic mixer, a photoconductive antenna, a Schottky barrier diode or a quantum well photodetector.

[0040] Preferably, when the radar signal processing module performs signal processing based on the intermediate frequency signal and in combination with the analog signal output by the signal generating module, the distance, speed and two-dimensional or three-dimensional information of objects between the communication receiving module and the link are detected through a range-Doppler algorithm, a back projection algorithm or a compressed sensing algorithm.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The present invention designs an integrated waveform based on a stepped frequency signal, which can flexibly configure the duration of the stepped frequency signal and the communication signal to cope with a variety of scenarios;

[0043] (2) The present invention combines an integrated waveform with a photonic terahertz wireless communication system, which can achieve high-resolution imaging and high-speed wireless communication. The system is easy to implement and has high spectrum efficiency.

[0044] (3) The integrated waveform proposed in the present invention can have the functions of both target perception and channel perception. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 is a schematic diagram of the structure of a photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving provided in an embodiment;

[0047] Figure 2 It is a time-frequency diagram of the stepped frequency integrated signal provided in the embodiment. DETAILED DESCRIPTION

[0048] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation methods described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0049] The inventive concept of the present invention is: in view of the technical problems of low spectrum utilization and perception blind spots in existing photonic terahertz integrated systems, an embodiment of the present invention provides a photonic terahertz communication and perception integrated system with stepped frequency time slot interleaving, which forms a stepped frequency integrated signal by inserting communication symbols into the timing gap of the stepped frequency signal of a traditional radar, and combines it with a photonic terahertz wireless system, so that the system resource configuration is flexible and the spectrum utilization is greatly improved.

[0050] Based on the above invention concept, Figure 1 As shown, the photonic terahertz communication and perception integrated system with stepped frequency time slot interleaving provided in the embodiment includes a signal generating module, a signal modulating module, an integrated signal transmitting module, a communication receiving module, and a radar receiving module, wherein the signal generating module is used to insert communication symbols in the timing gap of the stepped frequency signal to form a stepped frequency integrated signal and convert it into an analog signal to be sent out; the signal modulating module is used to modulate the stepped frequency integrated signal output by the signal generating module onto an optical carrier to form an optical carrier signal; the integrated signal transmitting module is used to convert the optical carrier signal into a terahertz integrated signal and transmit it; the communication receiving module is used to receive the terahertz integrated signal and demodulate and recover it to obtain communication information; the radar receiving module is used to receive the terahertz integrated signal and process it to obtain perception information.

[0051] In the embodiment, the signal generating module includes a step frequency signal generating module, a communication symbol inserting module, and an arbitrary signal generator module connected in sequence. Figure 2 As shown, the step frequency signal generating module is used to generate N single frequency signals with a frequency interval of Δf, the duration of each single frequency signal is Tr, and the period of the single frequency signal is Tp, wherein Tp>Tr, and N is any integer greater than or equal to 2. Since Δf, Tr, Tp and N are all configurable, flexible configuration of the single frequency signal can be achieved.

[0052] The communication symbol insertion module is used to generate communication symbols with configurable modulation mode and baud rate, and after dividing the communication symbols into a series of chips with a duration of Tc, the chips are sequentially inserted into the idle time gaps that do not overlap with the single-frequency signal in time in each cycle to form a stepped frequency integrated signal, wherein Tc=Tp-Tr, and the modulation format of the communication symbol includes a pulse amplitude modulation signal, an M-order phase modulation signal, an M-order orthogonal amplitude modulation signal, a minimum frequency shift keying signal, and an orthogonal frequency division multiplexing signal, wherein the M value in the M-order phase modulation signal is a positive even number, and the M value in the M-order orthogonal amplitude modulation signal is a positive even number greater than or equal to 4. Since the baud rate and modulation mode of the communication symbol can be configured, and at least one modulation mode can be configured, the configuration of the communication symbol can be realized, and thus, combined with the configurable characteristics of the single-frequency signal, the formed stepped frequency integrated signal has high flexibility and configurability, which greatly improves the spectrum utilization.

[0053] The arbitrary signal generator module is used to convert the step frequency integrated signal into an analog signal of arbitrary waveform and send it out to be received by the optical modulator of the signal modulation module.

[0054] In the embodiment, the signal modulation module includes a tunable laser 1, a polarization controller 1, and an optical modulator. Among them, the tunable laser 1 can adopt a tunable external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser with a wavelength of 1550nm, etc., to generate an optical signal, and the optical signal enters the optical modulator through the polarization controller 1. The polarization controller 1 is used to change the polarization state of the input optical signal to maximize the output power. The optical modulator can adopt a dual parallel Mach-Zehnder modulator, which is used to modulate the step frequency integrated signal output by the signal generation module onto the optical signal with the maximum output power to form an optical carrier signal and output it.

[0055] In the embodiment, the integrated signal transmission module includes an optical amplifier, an optical coupler, a polarization controller 2, an adjustable attenuator and a terahertz integrated transmitter connected in sequence, and also includes a tunable laser 2. Among them, the optical amplifier can adopt a semiconductor laser amplifier, an erbium-doped fiber amplifier, etc., for amplifying the optical carrier signal. The tunable laser 2 can also adopt a tunable external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser with a wavelength of 1550nm, etc., for beating with the amplified optical carrier signal to generate a terahertz signal. The frequency of the terahertz signal depends on the frequency difference between the tunable laser 1 and the tunable laser 2, and the power of the terahertz signal is consistent with the power of the amplified optical carrier signal to achieve power matching. The optical coupler is used to couple the amplified optical carrier signal and the terahertz signal into one path and output it. The coupled signal enters the terahertz integrated transmitter after passing through the polarization controller 2 and the adjustable attenuator. The polarization controller 2 is used to adjust the polarization state of the optical signal output by the optical coupler so that the output photocurrent is maximized under the same optical power. The adjustable attenuator is used to adjust the optical power of the optical signal output by the polarization controller 2 (that is, the optical signal entering the terahertz integrated transmitter). The terahertz integrated transmitter is used to beat the optical signal output by the adjustable attenuator, generate a terahertz integrated signal with a frequency equal to the optical signal frequency difference and transmit it to the free space, propagate through the free space link, and are received and processed by the communication receiving module and the radar receiving module respectively. Specifically, the terahertz integrated transmitter can use a single-row carrier photodetector, such as the IOD-PMJ-13001 model photodetector of NTT Corporation of Japan, which has an operating frequency of 280-380GHz, a typical output value of -11dBm under 7mA photocurrent conditions, and a DC responsivity of 0.22A / W.

[0056] In the embodiment, the communication receiving module includes a terahertz signal receiver and a signal demodulation module connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal demodulation module is used to extract the communication symbol from the intermediate frequency signal, perform communication channel compensation, and restore the communication information of the transmitter. The terahertz signal receiver can be a subharmonic mixer, a photoconductive antenna, a Schottky barrier diode, or a quantum well photodetector, etc.

[0057] In the embodiment, the radar receiving module includes a terahertz signal receiver and a signal processing module connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal processing module is used to perform signal processing based on the intermediate frequency signal and in combination with the analog signal output by the signal generating module to obtain the sensing information. When performing signal processing based on the received intermediate frequency signal and in combination with the analog signal output by the signal generating module, the distance, speed, and two-dimensional or three-dimensional information of the communication receiving module and the object between the links are detected by the range-Doppler algorithm, the back projection algorithm, or the compressed sensing algorithm.

[0058] In the integrated photonic terahertz communication and perception system with stepped frequency time domain interpolation provided in the above-mentioned embodiment, the stepped frequency time slot interpolation integrated signal generated by the signal generation module is modulated onto the optical carrier by the signal modulation module, and the modulated optical signal carrying the integrated waveform is amplified by the optical amplifier, and coupled with the local oscillator laser with a frequency difference of the terahertz band, and the coupled optical signal is optically heterodyned by the terahertz integrated transmitter to obtain the terahertz integrated signal and radiate it into the free space. The system architecture using optical heterodyne can generate a terahertz integrated signal with large bandwidth and low harmonic interference. Combining the stepped frequency signal with the integrated photonic terahertz communication and perception system can realize the flexible configuration of communication and perception resources, taking into account both high-speed wireless communication and high-resolution perception. The system has the advantages of flexible resource configuration, high spectrum efficiency and simple structure.

[0059] The specific implementation methods described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above is only the most preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photonic terahertz communication and sensing integrated system with stepped frequency time slot interpolation, characterized in that: It includes a signal generating module, a signal modulating module, an integrated signal transmitting module, a communication receiving module, and a radar receiving module; The signal generating module is used to insert communication symbols into the timing gap of the step frequency signal to form a step frequency integrated signal and convert it into an analog signal for transmission; The signal modulation module is used to modulate the step frequency integrated signal output by the signal generation module onto the optical carrier to form an optical carrier signal; The integrated signal transmission module is used to convert the optical carrier signal into a terahertz integrated signal and transmit it; The communication receiving module is used to receive the terahertz integrated signal and demodulate and recover the communication information; The radar receiving module is used to receive the terahertz integrated signal and process it to obtain the sensing information.

2. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 1 is characterized in that: The signal generating module comprises a step frequency signal generating module, a communication symbol inserting module and an arbitrary signal generator module which are connected in sequence; The step frequency signal generating module is used to generate N single frequency signals with a frequency interval of Δf, the duration of each single frequency signal is Tr, and the period of the single frequency signal is Tp, wherein Tp>Tr, N is any integer greater than or equal to 2, and Δf, Tr, Tp and N are all configurable; The communication symbol insertion module is used to generate communication symbols with configurable modulation mode and baud rate, and divide the communication symbols into a series of chips with a duration of Tc, and then insert the chips into the idle time gaps in each cycle that do not overlap with the single-frequency signal in time, to form a stepped frequency integrated signal, wherein Tc=Tp-Tr; The arbitrary signal generator module is used to convert the step frequency integrated signal into an analog signal of arbitrary waveform and send it out.

3. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 2 is characterized in that: The modulation format of the communication symbol includes a pulse amplitude modulation signal, an M-order phase modulation signal, an M-order orthogonal amplitude modulation signal, a minimum shift keying signal, and an orthogonal frequency division multiplexing signal, wherein the value of M in the M-order phase modulation signal is a positive even number, and the value of M in the M-order orthogonal amplitude modulation signal is a positive even number greater than or equal to 4; The modulation format of the generated communication symbols is at least one of all the above modulation formats.

4. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 1 is characterized in that: The signal modulation module comprises a tunable laser (1), a polarization controller (1), and an optical modulator; The tunable laser (1) is used to generate an optical signal; The polarization controller (1) is used to change the polarization state of the optical signal so as to maximize the output power; The optical modulator is used to modulate the step frequency integrated signal output by the signal generating module onto the optical signal with the largest output power to form an optical carrier signal and output it.

5. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 4 is characterized in that: The tunable laser (1) comprises an external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser; The optical modulator includes a dual parallel Mach-Zehnder modulator.

6. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 1 is characterized in that: The integrated signal transmission module comprises an optical amplifier, an optical coupler, a polarization controller (2), an adjustable attenuator and a terahertz integrated transmitter which are connected in sequence, and also comprises a tunable laser (2); The optical amplifier is used to amplify the optical carrier signal; The tunable laser (2) is used to beat the amplified optical carrier signal to generate a terahertz signal, the frequency of the terahertz signal depends on the frequency difference between the tunable laser (1) and the tunable laser (2), and the power of the terahertz signal is consistent with the power of the amplified optical carrier signal; The optical coupler is used to couple the amplified optical carrier signal and the terahertz signal into one path and output the signal; The polarization controller (2) is used to adjust the polarization state of the optical signal output by the optical coupler so that the output photocurrent is maximized under the same optical power; The adjustable attenuator is used to adjust the optical power of the optical signal output by the polarization controller (2); The terahertz integrated transmitter is used to beat the optical signal output by the adjustable attenuator, generate a terahertz integrated signal with a frequency equal to the optical signal frequency difference, and transmit the signal.

7. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 6 is characterized in that: The optical amplifier comprises a semiconductor optical amplifier or an erbium-doped fiber amplifier; The terahertz integrated emitter includes a single row of carrier photodetectors; The tunable laser (2) comprises an external cavity laser, a DFB laser, a DBR laser or a single longitudinal mode solid laser.

8. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 1 is characterized in that: The communication receiving module includes a terahertz signal receiver and a signal demodulation module which are connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal demodulation module is used to extract the communication symbol from the intermediate frequency signal, perform communication channel compensation, and restore the communication information of the transmitting end; The radar receiving module includes a terahertz signal receiver and a signal processing module which are connected in sequence, wherein the terahertz signal receiver is used to receive the terahertz integrated signal and convert it into an intermediate frequency signal; the signal processing module is used to perform signal processing based on the intermediate frequency signal and in combination with the analog signal output by the signal generating module to obtain perception information.

9. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 8 is characterized in that: The terahertz signal receiver includes a subharmonic mixer, a photoconductive antenna, a Schottky barrier diode or a quantum well photodetector.

10. The photonic terahertz communication and sensing integrated system with stepped frequency time slot interleaving according to claim 8, characterized in that: When the radar signal processing module performs signal processing based on the intermediate frequency signal and in combination with the analog signal output by the signal generating module, the distance, speed and two-dimensional or three-dimensional information of the communication receiving module and the objects between the links are detected through the range-Doppler algorithm, the back projection algorithm or the compressed sensing algorithm.

Images