A 5G external radiation source radar signal accumulation method

Abstract

The present invention discloses a 5G exo-radiation radar signal accumulation method, belonging to the field of exo-radiation radar technology. The method comprises the following steps: S1, signal acquisition and parameter setting; S2, signal segmentation interception; S3, Rényi entropy calculation; S4, signal accumulation interval selection; S5, signal coherent accumulation. To address the problem that the bandwidth of 5G downlink signals strongly depends on the transmission content, a sliding Rényi entropy calculation is performed to select signal intervals in the 5G signal with high transmission content as the coherent accumulation intervals for the exo-radiation radar. This method can effectively improve target resolution and echo signal-to-noise ratio, achieving effective detection of low-lying, slow, and small targets while using less computing resources.

Description

Technical Field

[0001] The present invention relates to a 5G external radiation source radar signal accumulation method, belonging to the technical field of external radiation source radar. Background Art

[0002] With the gradual opening of my country's low-altitude airspace and the increasing prevalence of aircraft, the types and range of low-altitude targets are expanding. This poses significant challenges and threats to the safety of urban low-altitude airspace, key locations, and large-scale events. Consequently, low-altitude target detection technology is gaining increasing attention. External emitter radar, a type of radar equipment, utilizes signals from uncoordinated emitters for signal processing. Instead of emitting signals itself, external emitter radar uses a third-party emitter as the radar's illumination source. The radar's receiving station receives electromagnetic waves reflected from the target, a coherent processing radar system. This system is particularly well-suited for urban environments where electromagnetic radiation is restricted but detection performance is demanding.

[0003] Electromagnetic signals that can be used by exo-radio radar in urban environments primarily include civilian broadcasting, television transmitters, navigation satellites, and communication base stations. Compared to other exo-radio signals, 5G networks offer wider coverage, a wider signal frequency band, and transmission bandwidth, with a maximum spectrum width of up to 100 MHz. This improves the radar system's range and velocity resolution, making it more suitable for exo-radio signals. However, the transmission bandwidth of 5G networks is highly dependent on the content being transmitted, and the instantaneous bandwidth is constantly changing. When the transmission content is small, only a portion of the time-frequency resources are occupied, which will seriously affect the target detection performance of 5G exo-radio radar. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for accumulating 5G external radiation source radar signals to reduce the impact of instantaneous drop in 5G signal energy.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] In a first aspect, the present invention provides a 5G external radiation source radar signal accumulation method, comprising:

[0007] Obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th;

[0008] The signal segmentation interception step includes: the 5G signal is segmented according to the coherent accumulation time T int and sliding window duration T slipPerform segmented interception to obtain segmented intercepted 5G signal s i (t);

[0009] The steps of Rényi entropy calculation include: calculating 5G signal s i Rényi entropy of (t)

[0010] The signal accumulation interval selection step includes: converting the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, repeat the signal segmentation interception step, the Rényi entropy calculation step, and the signal accumulation interval selection step;

[0011] calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

[0012] Furthermore, the segmented intercepted 5G signal s i (t), expressed as:

[0013] s i (t) = s ref ((i-1)·T slip :T int +(i-1)·T slip )

[0014] Here, i is the number of segments of the 5G signal.

[0015] Furthermore, the calculation of 5G signal s i Rényi entropy of (t) Expressed as:

[0016]

[0017] Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform.

[0018] Furthermore, the value of γ is 3 to ensure the stability of the results.

[0019] Furthermore, the absolute value of the short-time Fourier transform TF x (t,ω), expressed as:

[0020]

[0021] Where * represents conjugate, t represents time, ω represents frequency, s i (t) is the segmented intercepted 5G signal, and h(t) is the time window function.

[0022] Furthermore, the calculation and The mutual fuzzy function is expressed as:

[0023]

[0024] Where * indicates conjugation, τ indicates time delay, and f d Indicates the Doppler frequency.

[0025] In a second aspect, the present invention provides a 5G external radiation source radar signal accumulation device, comprising:

[0026] Signal acquisition and parameter setting module, used to obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th;

[0027] The signal segmentation interception module is used to segment the 5G signal according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain segmented intercepted 5G signal s i (t);

[0028] Rényi entropy calculation module, used to calculate 5G signal s i Rényi entropy of (t)

[0029] Signal accumulation interval selection module is used to convert the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, the signal segmentation interception module, the Rényi entropy calculation module and the signal accumulation interval selection module are repeatedly returned;

[0030] Signal coherent accumulation module, used to calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

[0031] Furthermore, in the Rényi entropy calculation module, the 5G signal s is calculated.i Rényi entropy of (t) Expressed as:

[0032]

[0033] Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform, expressed as:

[0034]

[0035] Where * represents conjugate, t represents time, ω represents frequency, s i (t) is the segmented intercepted 5G signal, and h(t) is the time window function.

[0036] In a third aspect, the present invention provides an electronic device including a processor and a storage medium;

[0037] The storage medium is used to store instructions;

[0038] The processor is configured to operate according to the instructions to execute the steps of any of the aforementioned methods.

[0039] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any of the aforementioned methods when executed by a processor.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] The present invention provides a 5G exo-radiation source radar signal accumulation method. To address the problem that the bandwidth of 5G downlink signals strongly depends on the transmission content, the present invention calculates the Renyi entropy by sliding, and selects signal intervals with more transmission content in the 5G signal as the coherent accumulation interval of the exo-radiation source radar. This method can effectively improve the target resolution and echo signal-to-noise ratio, and achieve effective detection of low, slow and small targets while occupying lower computing resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a schematic structural diagram of an external radiation source radar system provided by an embodiment of the present invention;

[0043] Figure 2 This is a flowchart of a 5G external radiation source radar signal accumulation method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] Example 1

[0046] This embodiment introduces a method for accumulating 5G external radiation source radar signals, including:

[0047] Obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th;

[0048] The signal segmentation interception step includes: the 5G signal is segmented according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain segmented intercepted 5G signal s i (t);

[0049] The steps of Rényi entropy calculation include: calculating 5G signal s i Rényi entropy of (t)

[0050] The signal accumulation interval selection step includes: converting the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, repeat the signal segmentation interception step, the Rényi entropy calculation step, and the signal accumulation interval selection step;

[0051] calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

[0052] The 5G external radiation source radar signal accumulation method provided in this embodiment is targeted at 5G downlink signal external radiation source radar, and its general structure is as follows: Figure 1 The external radiation source radar reference channel antenna points to the direction of the 5G base station to obtain the reference signal s ref (t), the monitoring channel antenna points to the detection airspace to obtain the target echo signal s echo (t).

[0053] The implementation process and signal processing flow are as follows Figure 2 As shown, the specific process is described as follows:

[0054] S1. Signal acquisition and parameter setting: The external radiation source radar receiver receives the reference signal sref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th;

[0055] S2, signal segmentation interception: 5G signal is intercepted according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain s i (t);

[0056] Specifically, the segmented intercepted 5G signal s i (t), expressed as:

[0057] s i (t) = s ref ((i-1)·T slip :T int +(i-1)·T slip )

[0058] Here, i is the number of segments of the 5G signal.

[0059] S3, Rényi entropy calculation: Calculate 5G signal s i Rényi entropy of (t)

[0060] Specifically, 5G signal s i Rényi entropy of (t) Expressed as:

[0061]

[0062] Among them, γ is the order of Rényi entropy, which is generally 3, used to ensure the stability of the results. x (t,ω) is the absolute value of the Short-Time Fourier Transform (STFT), expressed as:

[0063]

[0064] Where * represents conjugate, t represents time, ω represents frequency, s i (t) is the segmented intercepted 5G signal, and h(t) is the time window function.

[0065] S4. Signal accumulation interval selection: Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, repeat processes S2 to S4.

[0066] S5: Signal Coherence Accumulation: Calculation and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

[0067] Specifically, calculate and The mutual fuzzy function is expressed as:

[0068]

[0069] Where * indicates conjugation, τ indicates time delay, and f d Indicates the Doppler frequency.

[0070] Example 2

[0071] This embodiment provides a 5G external radiation source radar signal accumulation device, including:

[0072] Signal acquisition and parameter setting module, used to obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th;

[0073] The signal segmentation interception module is used to segment the 5G signal according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain segmented intercepted 5G signal s i (t);

[0074] Rényi entropy calculation module, used to calculate 5G signal s i Rényi entropy of (t)

[0075] Signal accumulation interval selection module is used to convert the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, the signal segmentation interception module, the Rényi entropy calculation module and the signal accumulation interval selection module are repeatedly returned;

[0076] Signal coherent accumulation module, used to calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

[0077] Furthermore, in the Rényi entropy calculation module, the 5G signal s is calculated. i Rényi entropy of (t) Expressed as:

[0078]

[0079] Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform, expressed as:

[0080]

[0081] Where * represents conjugate, t represents time, ω represents frequency, s i (t) is the segmented intercepted 5G signal, and h(t) is the time window function.

[0082] Example 3

[0083] This embodiment provides an electronic device, including a processor and a storage medium;

[0084] The storage medium is used to store instructions;

[0085] The processor is configured to operate according to the instructions to execute the steps of the method according to any one of the first embodiments.

[0086] Example 4

[0087] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the steps of any one of the methods described in Embodiment 1 are implemented.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A 5G external radiation source radar signal accumulation method, characterized in that: include: Obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th; The signal segmentation interception step includes: the 5G signal is segmented according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain segmented intercepted 5G signal s i (t); The steps of Rényi entropy calculation include: calculating 5G signal s i Rényi entropy of (t) Expressed as: Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform; t represents time, ω represents frequency; The signal accumulation interval selection step includes: converting the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, repeat the signal segmentation interception step, the Rényi entropy calculation step, and the signal accumulation interval selection step; calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

2. The 5G external radiation source radar signal accumulation method according to claim 1, characterized in that: The segmented intercepted 5G signal s i (t), expressed as: s i (t)=s ref ((i-1)·T slip :T int +(i-1)·T slip ); Here, i is the number of segments of the 5G signal.

3. The 5G external radiation source radar signal accumulation method according to claim 1, characterized in that: The value of γ is 3, which is used to ensure the stability of the results.

4. The 5G external radiation source radar signal accumulation method according to claim 1, characterized in that: The absolute value of the short-time Fourier transform TF x (t,ω), expressed as: Where * indicates conjugation, s i (t) is the segmented intercepted 5G signal, h(t) is the time window function, and τ represents the delay.

5. The 5G external radiation source radar signal accumulation method according to claim 1, characterized in that: The calculation and The mutual fuzzy function is expressed as: Where * indicates conjugation, τ indicates time delay, and f d Indicates the Doppler frequency.

6. A 5G external radiation source radar signal accumulation device, characterized in that: include: Signal acquisition and parameter setting module, used to obtain the reference signal s received in advance by the external radiation source radar receiver ref (t) and the echo signal s echo (t), set the coherent accumulation time T int , sliding window duration T slip and detection threshold Th; The signal segmentation interception module is used to segment the 5G signal according to the coherent accumulation time T int and sliding window duration T slip Perform segmented interception to obtain segmented intercepted 5G signal s i (t); Rényi entropy calculation module, used to calculate 5G signal s i Rényi entropy of (t) Expressed as: Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform; t represents time, ω represents frequency; Signal accumulation interval selection module is used to convert the Rényi entropy Compare with the detection threshold Th, if it is greater than the detection threshold, then s i The signal interval where (t) is located is used as the coherent accumulation interval of the external radiation source radar, and the reference signal in this interval is obtained. and echo signal Otherwise, the signal segmentation interception module, the Rényi entropy calculation module and the signal accumulation interval selection module are repeatedly returned; Signal coherent accumulation module, used to calculate and The mutual ambiguity function is used to improve the signal-to-noise ratio of the target echo and achieve effective detection of low, slow and small targets.

7. The 5G external radiation source radar signal accumulation device according to claim 6, characterized in that: In the Rényi entropy calculation module, the 5G signal s is calculated. i Rényi entropy of (t) Expressed as: Among them, γ is the order of Rényi entropy, TF x (t,ω) is the absolute value of the short-time Fourier transform, expressed as: Where * indicates conjugation, s i (t) is the segmented intercepted 5G signal, h(t) is the time window function, and τ represents the delay.

8. An electronic device, characterized in that: including processor and storage medium; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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