Doppler multiplexing OTFS-based radar communication integration method and system

Abstract

The application discloses a radar communication integration method and system based on Doppler multiplexed OTFS, and the method comprises the following steps: based on a communication signal and a radar signal, constructing an OTFS integrated modulation signal in a time-delay-Doppler domain; converting the OTFS integrated modulation signal into a time-domain signal and transmitting an OTFS time-domain signal; in response to the OTFS time-domain signal, receiving a return signal at a radar receiving end, performing radar target detection, determining target distance and target speed; in response to the OTFS time-domain signal, receiving a communication signal at a communication receiving end, and performing OTFS demodulation on the received communication signal to obtain communication information. The application realizes radar communication integration based on Doppler multiplexed OTFS, the integrated waveform is easy to realize, and the subsequent radar and communication processing procedures are not affected, a new processing method does not need to be redesigned, and the target detection performance and communication performance under a moving platform can be improved.

Description

Technical Field

[0001] This invention belongs to the field of radar communication integration technology, specifically relating to a radar communication integration method and system based on Doppler multiplexing OTFS. Background Technology

[0002] With the development of millimeter-wave radar and 5G and even future 6G wireless communication, the operating frequency bands of radar and communication are gradually converging, which lays the foundation for the realization of digital antennas for radar and communication. In addition, both radar and communication can perform digital signal processing, thus promoting the sharing of digital signal processors between radar and communication.

[0003] In terms of hardware, radar and communication have already achieved integration. However, to achieve deeper integration, the key lies in the design of the integrated waveform. Radar-communication integrated waveform refers to using a single waveform to achieve both radar and communication functions. Functionally, radar primarily aims to detect and sense targets, while communication mainly transmits information. As one of the main carriers of radar-communication integration, Orthogonal Frequency Division Multiplexing (OFDM) waveform design methods can be divided into two main categories: one is multiplexed waveform design, which combines radar and communication waveforms in a certain dimension through multiplexing technology and transmits them, and the received waveform can be separated into radar and communication waveforms through signal processing; the other is shared waveform design, which uses only one waveform to achieve both radar target detection and communication signal transmission at the receiving end through different signal processing methods. Because shared waveform design requires consideration of trade-offs between radar and communication performance, and requires the design of dedicated processing flows at both the radar signal processing and communication receiving ends, OFDM-based multiplexed waveform design is more advantageous when spectrum resources are abundant.

[0004] However, existing technologies have the following shortcomings: due to the sensitivity of OFDM to Doppler, OFDM-based multiplexed waveform design is not suitable for high-speed motion scenarios. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a radar communication integration method and system based on Doppler multiplexing OTFS to solve at least one of the above-mentioned technical problems.

[0006] This invention utilizes the high Doppler tolerance of OTFS to propose a radar communication integrated multiplexing waveform design based on Orthogonal Time Frequency Space (OTFS), which can realize radar communication integration in high-speed motion scenarios.

[0007] Firstly, a radar-communication integrated method based on Doppler multiplexing OTFS is provided, including:

[0008] Based on communication signals and radar signals, an integrated OTFS modulation signal is constructed in the time-delay-Doppler domain;

[0009] Convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal;

[0010] In response to the OTFS time-domain signal, the radar receiver receives the echo signal, performs radar target detection, and determines the target distance and target speed;

[0011] In response to the OTFS time-domain signal, the communication receiver receives the communication signal and performs OTFS demodulation on the received communication signal to obtain the communication information.

[0012] In some embodiments, an integrated OTFS modulation signal is constructed in the time-delay-Doppler domain based on communication signals and radar signals, including:

[0013] In the integrated signal delay-Doppler domain, the first One Doppler channel is used to store radar signals, and the other Doppler channels are used to store communication signals; the radar signals are linear frequency modulated signals, and in the time-delay-Doppler domain, the OTFS integrated modulation signal... Represented as:

[0014]

[0015] in, Indicates frequency modulation. Indicates integrated signal bandwidth, Indicates the duration of the OTFS integrated signal. Represents the number of subcarriers in the frequency domain. The amplitude of the radar signal. This indicates that the modulated communication signal can be generated through phase-keying modulation or quadrature amplitude modulation. For the index of the Doppler field, For the time delay domain index; The Doppler channel representing the radar signal satisfies , The number of OTFS symbols represents the time domain; the integrated modulation signal is placed on a time-delay-Doppler domain plane grid for OTFS modulation; the time-delay-Doppler domain plane grid is defined as... :

[0016]

[0017] in, Indicates the resolution of the Doppler axis. This is expressed as the pulse duration. This indicates the resolution of the time delay axis. Represented as subcarrier spacing, satisfying .

[0018] In some embodiments, converting the OTFS integrated modulation signal into a time-domain signal and transmitting the OTFS time-domain signal includes:

[0019] The OTFS integrated modulation signal in the time-delay-Doppler domain is obtained by using the inverse symplectic finite Fourier transform. Mapped to symbols on a time-frequency domain planar grid :

[0020]

[0021] Symbols on the time-frequency domain plane grid An integrated modulation signal that is modulated into multiple pulse signals to be transmitted in the time domain. :

[0022]

[0023] in, This represents the current moment of the integrated modulation signal. This is represented as a pulse shaping function.

[0024] Integrated modulation signal based on the multiple pulse signals The OTFS time-domain signal is obtained by performing digital-to-analog conversion and up-conversion processing, and the OTFS time-domain signal is radiated into the transmission space through the transmitting antenna.

[0025] In some embodiments, in response to the OTFS time-domain signal, the echo signal is received at the radar receiver, radar target detection is performed, and the target range and target velocity are determined, including:

[0026] At the radar receiver, the received echo signal undergoes down-conversion and analog-to-digital conversion, and is then discretized to obtain the radar echo signal. ;

[0027] The radar echo signal is pulse compressed to obtain the pulse-compressed radar echo signal. :

[0028]

[0029] in, This refers to a matched filter that performs pulse compression on the received signal. To indicate, This is represented as the convolution of signals; For the index of the Doppler field, For the index of the delay domain, This indicates the number of subcarriers in the frequency domain. Indicates the integrated signal bandwidth;

[0030] Radar echo signal after pulse compression processing Perform DFT on the slow time dimension to complete moving target detection;

[0031] The data obtained from the detection of moving targets are stitched into a two-dimensional data matrix and processed using a two-dimensional constant false alarm rate. If the power of the unit under test is greater than the interference power of the reference unit, it is assumed that there is a target in the unit under test, and the fast time dimension and slow time dimension of the unit under test are read.

[0032] Calculate the target distance based on fast time dimension units;

[0033] The target velocity is calculated based on the slow time dimension unit and the pulse repetition frequency of the signal.

[0034] In some embodiments, in response to an OTFS time-domain signal, a communication signal is received at the communication receiving end, and the received communication signal is demodulated using OTFS to obtain communication information, including:

[0035] At the communication receiving end, the received signal is down-converted and analog-to-digital converted to obtain the communication transmission signal. Convert it to a mutual fuzzy function, as shown in the following formula:

[0036]

[0037] In the formula, This indicates the conjugate operation. This represents the received pulse shaping function. for and Mutually ambiguous functions; Indicates the current frequency of the integrated modulation signal, For the current time of the integrated modulation signal, Variables representing the mutual ambiguity function;

[0038] With intervals Sampling is performed to obtain the time-frequency domain received signal. :

[0039]

[0040] Received signals in the time-frequency domain Using the symplectic finite Fourier transform, the received signal in the time-frequency domain is transformed. Mapped to symbols in the time-delay-Doppler domain :

[0041]

[0042] In the formula, Represents the number of OTFS symbols in the time domain. This represents the number of subcarriers in the frequency domain.

[0043] Secondly, a radar-communication integrated system based on Doppler multiplexing OTFS is provided, including:

[0044] The signal construction module is used to: construct an OTFS integrated modulation signal in the time-delay-Doppler domain based on communication signals and radar signals;

[0045] The signal conversion and transmission module is used to: convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal;

[0046] The target detection module is used to: receive echo signals at the radar receiver in response to OTFS time-domain signals, perform radar target detection, and determine the target distance and target speed;

[0047] The communication processing module is used to: receive communication signals at the communication receiving end in response to OTFS time-domain signals, and perform OTFS demodulation on the received communication signals to obtain communication information.

[0048] Thirdly, the present invention provides an apparatus comprising,

[0049] Memory;

[0050] processor;

[0051] as well as

[0052] Computer programs;

[0053] The computer program is stored in the memory and configured to be executed by the processor to implement the method described in the first aspect above.

[0054] Fourthly, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described in the first aspect.

[0055] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0056] The radar-communication integrated method based on Doppler multiplexing OTFS provided by this invention features an integrated waveform that is easy to implement and does not affect subsequent radar and communication processing flows, eliminating the need for redesigning new processing methods. Compared with existing OFDM multiplexed waveforms, it can improve the accuracy of target detection and communication performance on moving platforms. Attached Figure Description

[0057] Figure 1 This is a flowchart of the radar-communication integration method based on Doppler multiplexing OTFS proposed in the embodiments of the present invention;

[0058] Figures 2(a)-(c) are schematic diagrams of the echo signal obtained in the embodiment of the present invention passing through pulse compression and moving target detection in sequence, and the bit error rate results of the communication received signal.

[0059] Figures 3(a)-(b) show the target distance and velocity detection and bit error rate performance of the embodiments of the present invention compared with the integrated signal based on subcarrier multiplexing OFDM.

[0060] Figure 4 This refers to the bit error rate performance of the embodiments of the present invention compared to the integrated signal based on subcarrier multiplexing OFDM. Detailed Implementation

[0061] The technical solutions of various embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Example 1

[0063] A radar-communication integration method based on Doppler multiplexing OTFS includes:

[0064] Based on communication signals and radar signals, an integrated OTFS modulation signal is constructed in the time-delay-Doppler domain;

[0065] Convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal;

[0066] In response to the OTFS time-domain signal, the radar receiver receives the echo signal, performs radar target detection, and determines the target distance and target speed;

[0067] In response to the OTFS time-domain signal, the communication receiver receives the communication signal and performs OTFS demodulation on the received communication signal to obtain the communication information.

[0068] In some embodiments, a radar-communication integration method based on Doppler multiplexing OTFS, such as Figure 1 As shown, it includes the following steps:

[0069] Step 1. Construct the OTFS integrated modulation signal in the time delay-Doppler domain.

[0070] In the integrated signal delay-Doppler domain, the first One Doppler channel is used to store radar signals, and the other Doppler channels are used to store communication signals. Assuming the radar signal uses a linear frequency modulated (LFM) signal, in the time-delay-Doppler domain, the signal can be represented as:

[0071]

[0072] in, Indicates frequency modulation. The amplitude of the radar signal. This indicates that the modulated communication signal can be generated using phase-shift keying modulation or quadrature amplitude modulation. For the index of the Doppler field, This is the index for the delay domain. The Doppler channel representing the radar signal satisfies The modulated signal of the integrated signal is placed on a time-delay-Doppler domain planar grid and subjected to OTFS modulation. The time-delay-Doppler domain planar grid is defined as follows: And satisfy the following formula:

[0073]

[0074] In the formula, Indicates the resolution of the Doppler axis. This is expressed as the pulse duration. This indicates the resolution of the time delay axis.

[0075] Step 2. Convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal. Use the symplectic finite Fourier inverse transform to extract the information symbols in the time-delay-Doppler domain. Mapped to symbols in the time-frequency domain The mapping process satisfies the following equation:

[0076]

[0077] Symbols on the time-frequency domain plane grid An integrated modulation signal that is modulated into multiple pulse signals to be transmitted in the time domain. The transformation formula is as follows:

[0078]

[0079] The integrated modulation signal based on Doppler multiplexing OTFS is subjected to digital-to-analog conversion and up-conversion processing, and then radiated into the transmission space through the transmitting antenna.

[0080] Step 3. Receive the echo signal at the radar receiver and perform radar target detection.

[0081] At the radar receiver, the received echo signal undergoes down-conversion and analog-to-digital conversion, and is then discretized to obtain the radar echo signal. ;

[0082] The radar echo signal undergoes pulse compression processing, as shown in the following formula:

[0083]

[0084] in, This refers to a matched filter that performs pulse compression on the received signal. To indicate, This is represented as the convolution of signals;

[0085] Perform DFT on the slow time dimension of pulse compression processing to complete moving target detection;

[0086] The data obtained from the detection of moving targets are stitched into a two-dimensional data matrix and processed using a two-dimensional constant false alarm rate. If the power of the unit under test is greater than the interference power of the reference unit, it is assumed that there is a target in the unit under test, and the fast time dimension and slow time dimension of the unit under test are read.

[0087] Calculate the target distance based on fast time dimension units;

[0088] The target velocity is calculated based on the slow time dimension unit and the pulse repetition frequency of the signal.

[0089] Step 4. In response to the OTFS time domain signal, receive the communication signal at the communication receiving end and perform OTFS demodulation on the received communication signal.

[0090] At the communication receiving end, the received signal is down-converted and analog-to-digital converted to obtain the communication transmission signal. Convert it to a mutual fuzzy function, as shown in the following formula:

[0091]

[0092] In the formula, This indicates the conjugate operation. This represents the received pulse shaping function. for and Mutually ambiguous functions;

[0093] With intervals Sampling is performed to obtain the time-frequency domain received signal. As shown in the following formula:

[0094]

[0095] Received signals in the time-frequency domain Using the symplectic finite Fourier transform, the time-frequency domain signal is transformed... Mapped to symbols in the time-delay-Doppler domain The mapping process satisfies the following equation:

[0096]

[0097] In the formula, Represents the number of OTFS symbols in the time domain. This represents the number of subcarriers in the frequency domain.

[0098] The system is based on Doppler multiplexing OTFS to achieve integrated radar and communication. Its integrated waveform is easy to implement and does not affect the subsequent radar and communication processing flow. It does not require the redesign of new processing methods and can solve the problem of Doppler frequency shift of OFDM multiplexed integrated signals under dynamic platforms.

[0099] As one implementation method, a radar-communication integrated system based on Doppler multiplexing OTFS is used for computer simulation to verify the ability of the present invention to perform target detection of radar signals and transmission of communication signals under the radar-communication integrated system.

[0100] Simulations were performed to verify the proposed OTFS-based integrated radar-communication multiplexed signal. In the given scenario, the radar uses a linear frequency modulated (LFM) signal, and the communication uses a 16QAM signal. The simulation parameters are shown in Table 1.

[0101] Table 1 Simulation Parameters

[0102]

[0103] Based on the simulation parameters, a pulse transmission signal based on OTFS was simulated. At the radar receiver, the pulse compression result of the received echo signal is shown in Figure 2(a), where no obvious peak could be found to obtain target information. Subsequently, the pulse-compressed signal was used for moving target detection, and the simulation results revealed an obvious peak, as shown in Figure 2(b).

[0104] After passing the detection results through constant false alarm rate (CFAR) testing, the parameter estimation yields the target and velocity, as shown in the table below:

[0105] Table 2 Estimation Results

[0106]

[0107] Based on the detection distance and detection speed calculated in Table 2, combined with the actual distance and actual radial velocity, it is found that the integrated multiplexed signal based on OTFS meets the radar performance requirements, indicating that the OTFS signal provided in this paper can detect multiple targets.

[0108] At the communication receiver, the received signal is demodulated using OTFS to remove the radar signal, resulting in a constellation diagram, as shown in Figure 2(c). Figure 2(c) shows that all received signals are located near the communication modulation signal, indicating that the integrated multiplexed signal based on OTFS can meet communication performance requirements.

[0109] Assuming the simulation parameters remain consistent with Table 1, the radial velocities of the target and the communication receiver are varied. The performance of the Doppler multiplexed signal based on OTFS and the frequency division multiplexing signal based on OFDM are compared, with each OFDM radar subcarrier accounting for half of the total subcarriers. One target exists within the detection range of the integrated radar-communication platform, at a distance of 16 km from the platform.

[0110] Simulation results of target parameter estimation using an integrated multiplexed signal based on OTFS and OFDM under different target radial velocities are shown in Figures 3(a) and 3(b). In Figure 3(a), as the radial velocity increases, the root mean square error (RMSE) of the velocity using the integrated multiplexed signal based on OTFS and OFDM remains essentially unchanged and does not exceed the velocity resolution. The RMSE of the velocity using the integrated multiplexed signal based on OFDM and OTFS is essentially the same. This is because the displacement generated by the Doppler frequency shift during velocity detection is exactly the Doppler index used for velocity estimation, and does not lead to an increase in velocity error. In Figure 3(b), it can be seen that as the radial velocity increases, the RMSE of the distance using the integrated multiplexed signal based on OTFS and OFDM continuously increases. However, the RMSE of the distance using the integrated multiplexed signal based on OFDM is larger than that using the integrated multiplexed signal based on OTFS, and the difference between the two RMSEs continuously increases with increasing radial velocity. This is because the Doppler frequency introduced in high-speed motion scenarios is too large, causing frequency offset of OFDM subcarriers, resulting in subcarrier shift. When performing waveform separation, it is impossible to separate all radar subcarriers, and when performing pulse compression, it causes the pulse compression result to shift, resulting in increased range error. Simulation results show that target estimation based on OTFS is more accurate than that based on OFDM integrated multiplexed signal.

[0111] Simulation results of the communication bit error rate using an integrated multiplexed signal based on OTFS and OFDM under different radial velocities at the communication receiver are as follows: Figure 4As shown, the bit error rate (BER) of the OFDM-based integrated multiplexed signal increases continuously with increasing radial velocity. This is because Doppler shift disrupts the orthogonality of the OFDM signal, leading to inter-carrier interference and reducing demodulation performance. However, the BER of the OTFS-based integrated multiplexed signal remains essentially constant with increasing radial velocity, consistent with the high Doppler tolerance characteristic of OTFS signals. The results indicate that in high-speed motion scenarios, the OTFS-based integrated multiplexed signal achieves better communication BER results than the OFDM-based integrated multiplexed signal.

[0112] Example 2

[0113] Secondly, based on Embodiment 1, this embodiment provides a radar-communication integrated system based on Doppler multiplexing OTFS, including:

[0114] The signal construction module is used to: construct an OTFS integrated modulation signal in the time-delay-Doppler domain based on communication signals and radar signals;

[0115] The signal conversion and transmission module is used to: convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal;

[0116] The target detection module is used to: receive echo signals at the radar receiver in response to OTFS time-domain signals, perform radar target detection, and determine the target distance and target speed;

[0117] The communication processing module is used to: receive communication signals at the communication receiving end in response to OTFS time-domain signals, and perform OTFS demodulation on the received communication signals to obtain communication information.

[0118] In some embodiments, the signal construction module is specifically used for:

[0119] In the integrated signal delay-Doppler domain, the first One Doppler channel is used to store radar signals, and the other Doppler channels are used to store communication signals; the radar signals are linear frequency modulated signals, and in the time-delay-Doppler domain, the OTFS integrated modulation signal... Represented as:

[0120]

[0121] in, Indicates frequency modulation. Indicates integrated signal bandwidth, Indicates the duration of the OTFS integrated signal. Represents the number of subcarriers in the frequency domain. The amplitude of the radar signal. This indicates a modulated communication signal; For the index of the Doppler field, For the time delay domain index; The Doppler channel representing the radar signal satisfies , The number of OTFS symbols represents the time domain; the integrated modulation signal is placed on a time-delay-Doppler domain plane grid for OTFS modulation; the time-delay-Doppler domain plane grid is defined as... :

[0122]

[0123] in, Indicates the resolution of the Doppler axis. This is expressed as the pulse duration. This indicates the resolution of the time delay axis. Represented as subcarrier spacing, satisfying .

[0124] In some embodiments, the signal conversion and transmission module is specifically used for:

[0125] The OTFS integrated modulation signal in the time-delay-Doppler domain is obtained by using the inverse symplectic finite Fourier transform. Mapped to symbols on a time-frequency domain planar grid :

[0126]

[0127] Symbols on the time-frequency domain plane grid An integrated modulation signal that is modulated into multiple pulse signals to be transmitted in the time domain. :

[0128]

[0129] in, This represents the current moment of the integrated modulation signal. Represented as a received pulse shaping function;

[0130] Integrated modulation signal based on the multiple pulse signals The OTFS time-domain signal is obtained by performing digital-to-analog conversion and up-conversion processing, and the OTFS time-domain signal is radiated into the transmission space through the transmitting antenna.

[0131] In some embodiments, the target detection module is specifically used for:

[0132] At the radar receiver, the received echo signal undergoes down-conversion and analog-to-digital conversion, and is then discretized to obtain the radar echo signal. ;

[0133] The radar echo signal is pulse compressed to obtain the pulse-compressed radar echo signal. :

[0134]

[0135] in, This refers to a matched filter that performs pulse compression on the received signal. To indicate, This is represented as the convolution of signals; For the index of the Doppler field, For the index of the delay domain, This indicates the number of subcarriers in the frequency domain. Indicates the integrated signal bandwidth;

[0136] Radar echo signal after pulse compression processing Perform DFT on the slow time dimension to complete moving target detection;

[0137] The data obtained from the detection of moving targets are stitched into a two-dimensional data matrix and processed using a two-dimensional constant false alarm rate. If the power of the unit under test is greater than the interference power of the reference unit, it is assumed that there is a target in the unit under test, and the fast time dimension and slow time dimension of the unit under test are read.

[0138] Calculate the target distance based on fast time dimension units;

[0139] The target velocity is calculated based on the slow time dimension unit and the pulse repetition frequency of the signal.

[0140] In some embodiments, the communication processing module is specifically used for:

[0141] At the communication receiving end, the received signal is down-converted and analog-to-digital converted to obtain the communication transmission signal. Convert it to a mutual fuzzy function, as shown in the following formula:

[0142]

[0143] In the formula, This indicates the conjugate operation. This represents the received pulse shaping function. for and Mutually ambiguous functions; Indicates the current frequency of the integrated modulation signal, For the current time of the integrated modulation signal, Variables representing the mutual ambiguity function;

[0144] With intervals Sampling is performed to obtain the time-frequency domain received signal. :

[0145]

[0146] Received signals in the time-frequency domain Using the symplectic finite Fourier transform, the received signal in the time-frequency domain is transformed. Mapped to symbols in the time-delay-Doppler domain :

[0147]

[0148] In the formula, Represents the number of OTFS symbols in the time domain. This represents the number of subcarriers in the frequency domain.

[0149] Example 3

[0150] Thirdly, based on Embodiment 1, this embodiment provides a device, including,

[0151] Memory;

[0152] processor;

[0153] as well as

[0154] Computer programs;

[0155] The computer program is stored in the memory and configured to be executed by the processor to implement the method described in Embodiment 1.

[0156] Example 4

[0157] Fourthly, based on Embodiment 1, this embodiment provides a storage medium on which a computer program is stored, and when the computer program is executed by a processor, it implements the method described in Embodiment 1.

[0158] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0159] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0160] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0161] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0162] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A radar-communication integrated method based on Doppler multiplexing OTFS, characterized in that, include: Based on communication signals and radar signals, an integrated OTFS modulation signal is constructed in the time-delay-Doppler domain, including: in the time-delay-Doppler domain of the integrated signal, the first... One Doppler channel is used to store radar signals, and the other Doppler channels are used to store communication signals; the radar signals are linear frequency modulated signals, and in the time-delay-Doppler domain, the OTFS integrated modulation signal... Represented as: ； in, Indicates frequency modulation. Indicates integrated signal bandwidth, Indicates the duration of the OTFS integrated signal. Represents the number of subcarriers in the frequency domain. The amplitude of the radar signal. This indicates a modulated communication signal; For the index of the Doppler field, This is an index for the time delay domain; The Doppler channel representing the radar signal satisfies , This represents the number of OTFS symbols in the time domain; the integrated modulation signal is placed on a time-delay-Doppler domain plane grid for OTFS modulation. Convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal; In response to the OTFS time-domain signal, the radar receiver receives the echo signal, performs radar target detection, and determines the target range and velocity. This includes: performing down-conversion and analog-to-digital conversion on the received echo signal at the radar receiver, and discretizing it to obtain the radar echo signal. The radar echo signal is pulse-compressed to obtain the pulse-compressed radar echo signal. : ； in, This refers to a matched filter that performs pulse compression on the received signal. To indicate, This is represented as the convolution of signals; For the index of the Doppler field, For the index of the delay domain, This indicates the number of subcarriers in the frequency domain. Indicates the integrated signal bandwidth; Radar echo signal after pulse compression processing DFT is performed on the slow time dimension to complete moving target detection; the data obtained from moving target detection are concatenated into a two-dimensional data matrix and subjected to two-dimensional constant false alarm rate processing; if the power of the unit under test is greater than the interference power of the reference unit, it is considered that there is a target in the unit under test, and the fast time dimension and slow time dimension of the unit under test are read; the target distance is calculated based on the fast time dimension; the target velocity is calculated based on the slow time dimension and the pulse repetition frequency of the signal. In response to the OTFS time-domain signal, the communication receiver receives the communication signal and performs OTFS demodulation on the received communication signal to obtain the communication information.

2. The radar-communication integrated method based on Doppler multiplexing OTFS according to claim 1, characterized in that, The time-delay-Doppler domain planar mesh is defined as : ； in, Indicates the resolution of the Doppler axis. This is expressed as the pulse duration. This indicates the resolution of the time delay axis. Represented as subcarrier spacing, satisfying .

3. The radar-communication integrated method based on Doppler multiplexing OTFS according to claim 2, characterized in that, Converting the OTFS integrated modulation signal into a time-domain signal and transmitting the OTFS time-domain signal includes: The OTFS integrated modulation signal in the time-delay-Doppler domain is obtained by using the inverse symplectic finite Fourier transform. Mapped to symbols on a time-frequency domain planar grid : ； Symbols on the time-frequency domain plane grid An integrated modulation signal that is modulated into multiple pulse signals to be transmitted in the time domain. : ； in, This represents the current moment of the integrated modulation signal. This is represented as a pulse shaping function. Integrated modulation signal based on the multiple pulse signals The OTFS time-domain signal is obtained by performing digital-to-analog conversion and up-conversion processing, and the OTFS time-domain signal is radiated into the transmission space through the transmitting antenna.

4. The radar-communication integrated method based on Doppler multiplexing OTFS according to claim 1, characterized in that, In response to the OTFS time-domain signal, the communication receiver receives the communication signal and performs OTFS demodulation on the received communication signal to obtain the communication information, including: At the communication receiving end, the received signal is down-converted and analog-to-digital converted to obtain the communication transmission signal. Convert it to a mutual fuzzy function, as shown in the following formula: ； In the formula, This indicates the conjugate operation. This represents the received pulse shaping function. for and Mutually ambiguous functions; Indicates the current frequency of the integrated modulation signal, For the current time of the integrated modulation signal, Variables representing the mutual ambiguity function; With intervals Sampling is performed to obtain the time-frequency domain received signal. : ； Received signals in the time-frequency domain Using the symplectic finite Fourier transform, the received signal in the time-frequency domain is transformed. Mapped to symbols in the time-delay-Doppler domain : ； In the formula, Represents the number of OTFS symbols in the time domain. This represents the number of subcarriers in the frequency domain.

5. A radar-communication integrated system based on Doppler multiplexing OTFS, characterized in that, include: The signal construction module is used to: construct an integrated OTFS modulation signal in the time-delay-Doppler domain based on communication and radar signals, specifically for: In the integrated signal delay-Doppler domain, the first One Doppler channel is used to store radar signals, and the other Doppler channels are used to store communication signals; the radar signals are linear frequency modulated signals, and in the time-delay-Doppler domain, the OTFS integrated modulation signal... Represented as: ； in, Indicates frequency modulation. Indicates integrated signal bandwidth, Indicates the duration of the OTFS integrated signal. Represents the number of subcarriers in the frequency domain. The amplitude of the radar signal. This indicates a modulated communication signal; For the index of the Doppler field, This is an index for the time delay domain; The Doppler channel representing the radar signal satisfies , This represents the number of OTFS symbols in the time domain; the integrated modulation signal is placed on a time-delay-Doppler domain plane grid for OTFS modulation. The signal conversion and transmission module is used to: convert the OTFS integrated modulation signal into a time-domain signal and transmit the OTFS time-domain signal; The target detection module is used to: receive echo signals at the radar receiver in response to OTFS time-domain signals, perform radar target detection, and determine target range and velocity. Specifically, it performs down-conversion and analog-to-digital conversion on the received echo signals at the radar receiver, and discretizes them to obtain the radar echo signals. The radar echo signal is pulse-compressed to obtain the pulse-compressed radar echo signal. : ； in, This refers to a matched filter that performs pulse compression on the received signal. To indicate, This is represented as the convolution of signals; For the index of the Doppler field, For the index of the delay domain, This indicates the number of subcarriers in the frequency domain. Indicates the integrated signal bandwidth; Radar echo signal after pulse compression processing DFT is performed on the slow time dimension to complete moving target detection; the data obtained from moving target detection are concatenated into a two-dimensional data matrix and subjected to two-dimensional constant false alarm rate processing; if the power of the unit under test is greater than the interference power of the reference unit, it is considered that there is a target in the unit under test, and the fast time dimension and slow time dimension of the unit under test are read; the target distance is calculated based on the fast time dimension; the target velocity is calculated based on the slow time dimension and the pulse repetition frequency of the signal. The communication processing module is used to: receive communication signals at the communication receiving end in response to OTFS time-domain signals, and perform OTFS demodulation on the received communication signals to obtain communication information.

6. The radar-communication integrated system based on Doppler multiplexing OTFS according to claim 5, characterized in that, The time-delay-Doppler domain planar mesh is defined as : ； in, Indicates the resolution of the Doppler axis. This is expressed as the pulse duration. This indicates the resolution of the time delay axis. Represented as subcarrier spacing, satisfying .

7. The radar-communication integrated system based on Doppler multiplexing OTFS according to claim 5, characterized in that, The signal conversion and transmission module is specifically used for: The OTFS integrated modulation signal in the time-delay-Doppler domain is obtained by using the inverse symplectic finite Fourier transform. Mapped to symbols on a time-frequency domain planar grid : ； Symbols on the time-frequency domain plane grid An integrated modulation signal that is modulated into multiple pulse signals to be transmitted in the time domain. : ； in, This represents the current moment of the integrated modulation signal. This is represented as a pulse shaping function. Integrated modulation signal based on the multiple pulse signals The OTFS time-domain signal is obtained by performing digital-to-analog conversion and up-conversion processing, and the OTFS time-domain signal is radiated into the transmission space through the transmitting antenna.

8. A storage medium, characterized in that, It stores a computer program thereon, which, when executed by a processor, implements the method described in any one of claims 1 to 4.

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