A DBF gain calculation method under large-scale phased array channel SNR difference conditions

Abstract

The application belongs to the technical field of phased array beam synthesis, and particularly relates to a DBF gain calculation method under the condition of large-scale phased array channel signal-to-noise ratio difference. The method sorts and dynamically combines the signal-to-noise ratios of each array element to be synthesized, and combines a signal-to-noise ratio difference judgment mechanism to effectively avoid the negative influence of low signal-to-noise ratio signals on the synthesis gain, and improve the accuracy of gain estimation and system robustness. The method mainly includes the following steps: first, the number of array elements and the signal-to-noise ratio of each array element are set, and the signal-to-noise ratio sequence is sorted; then, whether signal combination or rejection is performed according to the difference between the signal-to-noise ratios, and the sequence to be synthesized is dynamically updated, and finally, an accurate synthesis gain value is obtained. The application is suitable for practical engineering scenarios with a large number of channels and significant signal-to-noise ratio differences without significantly increasing the calculation complexity, and has good scalability and application prospect.

Description

Technical Field

[0001] This invention belongs to the field of phased array beamforming technology, and specifically relates to a DBF gain calculation method under the condition of signal-to-noise ratio difference of large-scale phased array channels. It can be used for gain calculation under the condition of a large number of channels and different signal-to-noise ratios. Background Technology

[0002] In phased array radar systems, digital beamforming (DBF) technology is widely used to improve system gain, directivity, and anti-jamming capabilities. Under ideal conditions, the signal-to-noise ratio (SNR) of each channel is consistent, and the DBF gain can be calculated using a simple square root summation method. However, in practical applications, due to differences in hardware performance, environmental noise, and signal propagation paths, the SNR of each channel often varies significantly.

[0003] In existing technologies, weighted combining methods, such as Maximum Ratio Combining (MRC), are typically used to calculate DBF gain under channel difference conditions. However, this method has high computational complexity in large-scale arrays and poor adaptability to signal-to-noise ratio (SNR) differences. Furthermore, some methods do not consider the negative impact of low SNR on the combined gain, leading to inaccurate gain estimation and affecting the overall system performance.

[0004] Therefore, in order to address the problem of difficulty in accurately calculating the synthesized gain in existing technologies when there are significant differences in signal-to-noise ratio, it is urgent to propose a DBF gain calculation method applicable to large-scale phased array systems under the condition that there are differences in signal-to-noise ratio in each channel, so as to improve the accuracy and robustness of system gain estimation. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a DBF gain calculation method under the condition of signal-to-noise ratio differences between channels in a large-scale phased array. This method can accurately calculate the synthesized gain and improve debugging efficiency when there are signal-to-noise ratio differences between multiple channels in a large-scale phased array.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for calculating DBF gain under the condition of signal-to-noise ratio difference in large-scale phased array channels includes the following steps:

[0008] Step 1: Let N be the number of elements in the large-scale phased array, and let the signal-to-noise ratio of the signal detected by each element be SNK. k k = 1, 2, ..., N, and the combined gain to be calculated is SNR. all ;

[0009] Step 2: Sort all signal-to-noise ratios to obtain the remaining signal-to-noise ratio sequences to be synthesized.

[0010]

[0011] Where m is the sorting index, initially 1, m∈{1,2,…,N}, y=Nm;

[0012] Step 3: Determine if m = N is satisfied. If the condition is satisfied, then... Proceed to step 8; if not satisfied, proceed to step 4.

[0013] Step 4: Based on the sequence in Step 2, start from the minimum signal-to-noise ratio to be synthesized. Begin by calculating the minimum signal-to-noise ratio. With the next signal-to-noise ratio The difference between them is ΔSNR;

[0014] Step 5: If ΔSNR is less than the set threshold, proceed to step 6; otherwise, proceed to step 7.

[0015] Step 6: Calculate the minimum signal-to-noise ratio With the next signal-to-noise ratio Synthetic gain signal-to-noise ratio (SNR) DBF and will and Discard the remaining signal-to-noise ratio (SNR) sequences from step 2, and use the SNR... DBF Add the remaining signal-to-noise ratio sequence to be synthesized, then let m = m + 1, and return to step 2;

[0016] Step 7: Discard the signal-to-noise ratio (SNR) sequence to be synthesized. Seq In get

[0017]

[0018] And let m = m + 1, update the index:

[0019]

[0020] Then return to step 3;

[0021] Step 8: The final SNR obtained all This refers to the DBF gain calculation result under the condition of signal-to-noise ratio difference in large-scale phased array channels.

[0022] The formula for calculating the signal-to-noise ratio of the synthesized gain in step 6 is as follows:

[0023]

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] First, by introducing a signal-to-noise ratio difference judgment mechanism, this invention effectively avoids the negative impact of low signal-to-noise ratio signals on the synthesis gain.

[0026] Second, the present invention adopts a dynamic merging strategy, which can improve the accuracy of gain estimation while ensuring computational efficiency.

[0027] Third, this invention is applicable to large-scale phased array systems and has good scalability and engineering practicality. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating the implementation of the present invention.

[0029] Figure 2 This is a spectrum diagram of signal 1 and a schematic diagram of its signal-to-noise ratio.

[0030] Figure 3 This is a spectrum diagram of signal 2 and a schematic diagram of its signal-to-noise ratio.

[0031] Figure 4 This is a spectrum diagram of signal 3 and its signal-to-noise ratio.

[0032] Figure 5 The image shows the spectrum of the synthesized signal and its signal-to-noise ratio. Detailed Implementation

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] Reference Figure 1 This invention provides a method for calculating DBF gain under conditions of signal-to-noise ratio differences in large-scale phased array channels, comprising the following steps:

[0035] Step 1: Let N be the number of elements in the large-scale phased array, and let the signal-to-noise ratio of the signal detected by each element be SNK. k k = 1, 2, ..., N, and the combined gain to be calculated is SNR. all .

[0036] Step 2: Sort all signal-to-noise ratios to obtain the remaining signal-to-noise ratio sequences to be synthesized.

[0037]

[0038] Where m is the sorting index, initially 1, m∈{1,2,…,N}, y=Nm.

[0039] Step 3: Determine if m = N is satisfied. If the condition is satisfied, Proceed to step 8; if not satisfied, proceed to step 4.

[0040] Step 4: Based on the sequence in Step 2, start from the minimum signal-to-noise ratio to be synthesized. Begin by calculating the minimum signal-to-noise ratio. With the next signal-to-noise ratio The difference between them is ΔSNR:

[0041]

[0042] Step 5: If ΔSNR is less than the set threshold (set to 8 in this embodiment), proceed to step 6; otherwise, proceed to step 7.

[0043] Step 6: Calculate the signal-to-noise ratio of the synthesized gain using the following formula:

[0044]

[0045] And and Discard the remaining signal-to-noise ratio (SNR) sequences from step 2 and set the SNR... DBF Add the remaining signal-to-noise ratio (SNR) sequence to be synthesized. Seq =SNR Seq ∪SNR DBF Let m = m + 1 and return to step 2.

[0046] Step 7: Discard the signal-to-noise ratio (SNR) sequence to be synthesized. Seq In Right now

[0047]

[0048] And let m = m + 1, update the index:

[0049]

[0050] Then return to step 3.

[0051] Step 8: The final SNR obtained all This refers to the DBF gain calculation result under the condition of signal-to-noise ratio difference in large-scale phased array channels.

[0052] The effects of this invention can be illustrated by the following simulation experiments:

[0053] 1. Experimental Environment and Conditions

[0054] The phased array is set to 3 elements, the signal sampling rate is set to 60MHz, and the intermediate frequency points are -1MHz and 1MHz. The signal-to-noise ratios of the two signals are 53.6087 (dB), 51.5706 (dB), and 49.5928 (dB), respectively. The gain of the phased array beamforming is calculated.

[0055] 2. Experimental Content and Results

[0056] Figures 2-4 The spectrum of the three-channel signal is shown, indicating the SNR;

[0057] Figure 5 The synthesized signal spectrum is shown, indicating the signal's SNR and the theoretically derived synthesized gain SNR value. The comparison demonstrates the correctness of the theoretical derivation.

[0058] In summary, the present invention provides a DBF gain calculation method for large-scale phased arrays under conditions of channel differences, and can be used for gain calculation under conditions of a large number of channels and different signal-to-noise ratios.

Claims

1. A method for calculating DBF gain under the condition of signal-to-noise ratio difference in large-scale phased array channels, characterized in that, Includes the following steps: Step 1: Let N be the number of elements in the large-scale phased array, and let the signal-to-noise ratio of the signal detected by each element be SNK. k k = 1, 2, ..., N, and the combined gain to be calculated is SNR. all ; Step 2: Sort all signal-to-noise ratios to obtain the remaining signal-to-noise ratio sequences to be synthesized. Where m is the sorting index, initially 1, m∈{1,2,…,N}, y=Nm; Step 3: Determine if m = N is satisfied. If the condition is satisfied, then... Proceed to step 8; if not satisfied, proceed to step 4. Step 4: Based on the sequence in Step 2, start from the minimum signal-to-noise ratio to be synthesized. Begin by calculating the minimum signal-to-noise ratio. With the next signal-to-noise ratio The difference between them is ΔSNR; Step 5: If ΔSNR is less than the set threshold, proceed to step 6; otherwise, proceed to step 7. Step 6: Calculate the minimum signal-to-noise ratio With the next signal-to-noise ratio Synthetic gain signal-to-noise ratio (SNR) DBF and will and Discard the remaining signal-to-noise ratio (SNR) sequences from step 2, and use the SNR... DBF Add the remaining signal-to-noise ratio sequence to be synthesized, then let m = m + 1, and return to step 2; Step 7: Discard the signal-to-noise ratio (SNR) sequence to be synthesized. Seq In get And let m = m + 1, update the index: Then return to step 3; Step 8: The final SNR obtained all This refers to the DBF gain calculation result under the condition of signal-to-noise ratio difference in large-scale phased array channels.

2. The DBF gain calculation method under the condition of signal-to-noise ratio difference in large-scale phased array channels according to claim 1, characterized in that, The formula for calculating the signal-to-noise ratio of the synthesized gain in step 6 is:

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