Communication and perception integrated system applied to speed measurement and distance measurement

Abstract

The invention belongs to the technical field of wireless communication, and discloses a communication and perception integrated system applied to speed measurement and distance measurement, which comprises a transmitting end, a transmission end, a communication receiving end and a perception receiving end, the method comprises the following steps: firstly, combining a bilinear frequency modulation signal with a probabilistic shaping 64-order quadrature amplitude modulation signal PS-64QAM; and then, based on a photon-assisted technology, constructing a terahertz frequency band communication sensing integrated system, and simultaneously realizing distance measurement, speed measurement and communication functions. According to the communication and sensing integrated system applied to speed measurement and distance measurement, PS64QAM-DLFM terahertz sensing integrated signals are generated through the time division multiplexing technology and the photon-assisted technology, the system has the high-speed communication function, the high-precision distance measurement function and the speed measurement function with a certain capacity at the same time, the sensing aspect is benefited from the bilinear frequency modulation technology, and the speed measurement accuracy is improved. Accurate measurement of the distance of a high-speed moving target is realized, and the problem of fuzzy distance and speed combined measurement in a sensing integrated system is solved.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technology, and in particular to a communication and perception integrated system for speed and distance measurement. Background Art

[0002] The current integrated communication and perception system based on linear frequency modulation (LFM) signals is prone to coupling problems between distance and speed when detecting moving targets, resulting in large ranging errors. Distance offset cannot be eliminated in LFM with a single frequency modulation slope, and it is impossible to provide independent distance and speed measurement values ​​at the same time.

[0003] In addition, systems that generate high-frequency synaesthesia integrated signals electronically are easily limited by the bandwidth of electronic equipment. High-frequency signals generated by pure electronic equipment are not ideal, have poor frequency stability and high phase noise.

[0004] Therefore, in response to the above-mentioned technical defects, the present invention proposes an integrated communication and perception system for speed and distance measurement. The high-frequency band signal generated based on photonics has high frequency stability and low phase noise, which is used to solve the problem of ambiguity in the joint measurement of distance and speed in the integrated synaesthesia system. Summary of the invention

[0005] The purpose of the present invention is to provide a communication and perception integrated system for speed measurement and distance measurement, which utilizes time division multiplexing (TDM) technology and photon-assisted technology to generate PS64QAM-DLFM terahertz synaesthesia integrated signals. The system has high-speed communication, high-precision distance measurement and speed measurement functions of a certain capability. In terms of perception, thanks to the dual linear frequency modulation technology, it can accurately realize the distance measurement of high-speed moving targets, and solves the problem of ambiguity in the joint measurement of distance and speed in the synaesthesia integrated system.

[0006] To achieve the above-mentioned object, the present invention provides a communication and perception integrated system for speed measurement and distance measurement, including a transmitting end, a transmission end, a communication receiving end and a perception receiving end;

[0007] Firstly, the dual linear frequency modulation signal is combined with the probability-shaped 64-order quadrature amplitude modulation signal PS-64QAM. Then, based on the photon-assisted technology, an integrated communication and perception system in the terahertz frequency band is constructed to realize the ranging, speed measurement and communication functions at the same time.

[0008] Preferably, the operating wavelength of the external cavity laser ECL1 at the transmitting end is 1550.32nm, the center frequency is 193.1GHz, the power is 10dBm, and the line width is 100kHz; the half-wave voltage of the IQ modulator is 4V, the 3dB bandwidth is 40GHz, the extinction ratio is 30dB, and the power loss is 6dB.

[0009] Preferably, the CW light generated by the external cavity laser ECL1 is modulated by an IQ modulator, and the modulated optical carrier carries a PS-64QAM signal with a bandwidth of 30 GHz and a dual linear frequency modulation signal with a bandwidth of 20 GHz.

[0010] Preferably, the baseband PS-64QAM signal and the dual linear frequency modulation signal are generated by off-line MATLAB programming and combined together by time division multiplexing.

[0011] Preferably, an arbitrary waveform generator AWG with a sampling rate of 64GSa / s is used to convert the time-division multiplexed terahertz synaesthesia integrated signal into an analog signal to drive the IQ modulator.

[0012] Preferably, before the photoelectric converter photodiode PD, the CW light generated by the polarization-maintaining optical coupler PM-OC is coupled with the external cavity laser ECL2; wherein the responsivity of the photoelectric converter photodiode PD is 0.4A / W, the frequency interval between the two optical carriers is 240GHz, and after the photoelectric conversion, the generated integrated signal is in the 255GHz frequency band.

[0013] Preferably, during the transmission process, the generated terahertz signal is divided into two parts, one part is transmitted into the wireless link, and the other part is used as a reference signal for extracting sensing information; wherein the transceiver antenna is integrated with a pair of special lenses and antennas.

[0014] Preferably, on the communication receiver side, the terahertz band signal is captured by the terahertz receiving antenna HA2 and down-converted to the IF domain; the operating frequency of the RF source ELO1 after frequency multiplication is 240 GHz; then, the intermediate frequency signal is sent to an oscilloscope with a 3dB bandwidth of 30 GHz and a sampling rate of 64GSa / s; and then the signal is recovered through digital signal processing.

[0015] Preferably, the digital signal processing includes down-conversion, Schmidt orthogonalization GSOP, clock recovery, cascaded multi-mode equalization algorithm, fourth power frequency offset estimation and blind phase search carrier phase estimation.

[0016] Preferably, at the sensing end, the terahertz signal is reflected by the target, and the echo signal is received by the radar receiving antenna, and after passing through a 20dB low-noise amplifier and down-conversion, it is de-chirped with the reference signal; when the target is a stationary target, a single-frequency signal is generated after de-chirping; when the target is a moving target, two single-frequency signals are generated after de-chirping; finally, the distance and speed information of the target are obtained by calculating the generated signals.

[0017] Therefore, the present invention adopts the above-mentioned communication and perception integrated system for speed measurement and distance measurement, and the beneficial effects are as follows:

[0018] (1) The system proposed in the present invention has high-speed communication, high-precision distance measurement and certain speed measurement functions. The communication end can achieve lower bit error performance thanks to the probability shaping technology; the perception aspect benefits from the dual linear frequency modulation technology, which can accurately realize the distance measurement of high-speed moving targets and solve the problem of ambiguity in the joint measurement of distance and speed.

[0019] (2) The system proposed in the present invention generates a PS64QAM-DLFM terahertz synaesthesia integrated signal through TDM technology, and can flexibly control the performance of communication and perception by adjusting the time-width ratio of communication and perception signals.

[0020] (3) The terahertz signals generated based on photonics can break the bottleneck of deployed electrical equipment. The generated terahertz signals have high frequency stability and low phase noise.

[0021] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural block diagram of a communication and perception integrated system for speed measurement and distance measurement of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, the present invention is a communication and perception integrated system for speed measurement and distance measurement, including a transmitting end, a transmission end, a communication receiving end and a perception receiving end. First, a dual linear frequency modulation signal (DLFM) is combined with a probability-shaped 64-order quadrature amplitude modulation signal (PS-64QAM); then, based on photon-assisted technology, a communication and perception integrated system in the terahertz frequency band is constructed, which can simultaneously realize distance measurement, speed measurement and communication functions.

[0025] Example

[0026] like Figure 1 As shown, the present invention is a communication and perception integrated system for speed measurement and distance measurement, and the specific implementation process is as follows:

[0027] First, set the transmitter parameters. The operating wavelength of the transmitter external cavity laser ECL1 is 1550.32nm, the center frequency is 193.1GHz, the power is 10dBm, and the line width is 100kHz. The half-wave voltage of the IQ modulator is 4v, the 3dB bandwidth is 40GHz, the extinction ratio is 30dB, and the power loss is 6dB.

[0028] Secondly, the CW light generated by the external cavity laser ECL1 is then modulated by the IQ modulator, and the modulated optical carrier carries a PS-64QAM signal with a bandwidth of 30GHz and a DLFM signal with a bandwidth of 20GHz. Among them, the baseband PS-64QAM signal and DLFM signal are generated by offline MATLAB programming and combined together through time division multiplexing.

[0029] Then, an arbitrary waveform generator (AWG) with a sampling rate of 64GSa / s is used to convert the TDM-PS64QAM-DLFM signal into an analog signal to drive the IQ modulator.

[0030] Finally, the CW light generated by the external cavity laser ECL2 is coupled by the polarization-maintaining optical coupler PM-OC before the photodiode PD, where the responsivity of the PD is 0.4A / W, the frequency interval between the two optical carriers is 240GHz, and the integrated signal generated after the photoelectric conversion is in the 255GHz frequency band.

[0031] During the transmission process, the generated terahertz signal is divided into two parts, one part is transmitted into the wireless link, and the other part is used as a reference signal for extracting sensory information. Among them, the transceiver antenna is integrated with a pair of special lenses and antennas. The diameter of lens Len1 is 10 cm and the focal length is about 20 cm; the diameter of lens Len2 is 60 cm and the focal length is about 100 cm. The combined gain of terahertz antenna HA1 and lens Len1 is about 34dBi, the combined gain of terahertz antenna HA2 and lens Len2 is about 56dBi, and the combined gain of terahertz antenna HA3 and lens Len3 is about 56dBi. The total gain of each group of transceiver antennas is 90dBi.

[0032] On the communication receiver side, the terahertz band signal is captured by the receiving antenna HA2 and down-converted to the IF domain. The operating frequency of the RF source ELO1 after frequency multiplication is 240 GHz. Then, the intermediate frequency signal is sent to the oscilloscope OSC with a 3dB bandwidth of 30 GHz and a sampling rate of 64GSa / s.

[0033] The signal is then recovered through digital signal processing (DSP), which includes down-conversion, Schmidt orthogonalization (GSOP), clock recovery, cascaded multi-mode equalization algorithm (CMMA), fourth-power frequency offset estimation (FOE) and blind phase search carrier phase estimation (BPS).

[0034] At the sensing end, the terahertz signal is reflected by the target, and the echo signal is received by the radar receiving antenna. After passing through a 20dB low-noise amplifier and down-conversion, it is de-chirped with the reference signal. When the target is a stationary target, a single-frequency signal is generated after de-chirping; when the target is a moving target, two single-frequency signals are generated after de-chirping.

[0035] Finally, by calculating the generated signal, the distance and speed information of the target can be obtained.

[0036] Therefore, the present invention adopts the above-mentioned communication and perception integrated system applied to speed measurement and distance measurement, and has high-speed communication, high-precision distance measurement and speed measurement functions of a certain capacity. The communication end benefits from the probability shaping technology and can achieve lower error performance; the perception aspect benefits from the dual linear frequency modulation technology, which can accurately realize the distance measurement of high-speed moving targets and solve the problem of ambiguity in the joint measurement of distance and speed. The system proposed in the present invention generates PS64QAM-DLFM terahertz synaesthesia integrated signal through TDM technology, and can flexibly control the performance of communication and perception by adjusting the time-width ratio of communication and perception signals. The terahertz signal generated based on photonics can break the bottleneck of deployed electrical equipment, and the generated terahertz signal has high frequency stability and low phase noise.

[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 communication and perception integrated system for speed and distance measurement, characterized in that: It includes a transmitting end, a transmitting end, a communication receiving end and a sensing receiving end; Firstly, the dual linear frequency modulation signal is combined with the probability-shaped 64-order quadrature amplitude modulation signal PS-64QAM. Then, based on the photon-assisted technology, an integrated communication and perception system in the terahertz frequency band is constructed to realize the ranging, speed measurement and communication functions at the same time.

2. The integrated communication and perception system for speed and distance measurement according to claim 1, characterized in that: The operating wavelength of the external cavity laser ECL1 at the transmitting end is 1550.32nm, the center frequency is 193.1GHz, the power is 10dBm, and the linewidth is 100kHz; the half-wave voltage of the IQ modulator is 4v, the 3dB bandwidth is 40GHz, the extinction ratio is 30dB, and the power loss is 6dB.

3. The integrated communication and perception system for speed and distance measurement according to claim 2, characterized in that: The CW light generated by the external cavity laser ECL1 is modulated by an IQ modulator, and the modulated optical carrier carries a PS-64QAM signal with a bandwidth of 30 GHz and a dual linear frequency modulation signal with a bandwidth of 20 GHz.

4. The integrated communication and perception system for speed and distance measurement according to claim 3, characterized in that: The baseband PS-64QAM signal and dual-linear frequency modulation signal are generated by offline MATLAB programming and combined together through time division multiplexing.

5. The integrated communication and perception system for speed and distance measurement according to claim 4, characterized in that: An arbitrary waveform generator (AWG) with a sampling rate of 64GSa / s is used to convert the time-division multiplexed terahertz synaesthesia integration signal into an analog signal to drive the IQ modulator.

6. The integrated communication and perception system for speed and distance measurement according to claim 5, characterized in that: Before the photoelectric converter photodiode PD, the CW light generated by the polarization-maintaining optical coupler PM-OC is coupled with the external cavity laser ECL2; wherein, the responsivity of the photoelectric converter photodiode PD is 0.4A / W, and the frequency interval between the two optical carriers is 240GHz. After the photoelectric conversion, the generated integrated signal is in the 255GHz frequency band.

7. The integrated communication and perception system for speed and distance measurement according to claim 6, characterized in that: During the transmission process, the generated terahertz signal is divided into two parts, one part is transmitted into the wireless link, and the other part is used as a reference signal for extracting sensing information; among them, the transmitting and receiving antennas are integrated by a pair of special lenses and antennas.

8. The integrated communication and perception system for speed and distance measurement according to claim 7, characterized in that: On the communication receiver side, the terahertz band signal is captured by the terahertz receiving antenna HA2 and down-converted to the IF domain; the operating frequency of the RF source ELO1 is 240GHz after frequency multiplication; then, the intermediate frequency signal is sent to an oscilloscope with a 3dB bandwidth of 30GHz and a sampling rate of 64GSa / s; and then the signal is recovered through digital signal processing.

9. The communication and perception integrated system for speed and distance measurement according to claim 8, characterized in that: Digital signal processing includes down-conversion, Schmidt orthogonalization GSOP, clock recovery, cascaded multimode equalization algorithm, fourth power frequency offset estimation and blind phase search carrier phase estimation.

10. The integrated communication and perception system for speed and distance measurement according to claim 9, characterized in that: At the sensing end, the terahertz signal is reflected by the target, and the echo signal is received by the radar receiving antenna. After passing through a 20dB low-noise amplifier and down-conversion, it is de-chirped with the reference signal. When the target is a stationary target, a single-frequency signal will be generated after de-chirping; when the target is a moving target, two single-frequency signals will be generated after de-chirping; finally, the distance and speed information of the target are obtained by calculating the generated signals.

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