A secondary correction method for linear frequency modulation pulse signal of radar equipment

Abstract

The present invention discloses a method for secondary correction of linear frequency modulation pulse signals of radar equipment, a system for secondary correction of linear frequency modulation pulse signals of radar equipment, and electronic equipment. The method for secondary correction of linear frequency modulation pulse signals of radar equipment comprises: generating an intermediate frequency signal based on a linear frequency modulation pulse baseband signal; correcting the intermediate frequency signal by curve fitting and sampling to obtain an intermediate frequency primary correction signal; correcting the intermediate frequency primary correction signal by curve fitting and sampling to obtain an intermediate frequency secondary correction signal. This method solves the problem of low quality of linear frequency modulation pulse signals generated by common methods. At present, this method has been successfully applied in a test prototype of radar equipment, and the test results show that the linear frequency modulation pulse signal obtained by this method has high quality, and the peak-to-sidelobe ratio parameter and the compression width parameter are close to the theoretical value, meeting the use requirements.

Description

Technical Field

[0001] The invention relates to a signal correction method, in particular to a radar device linear frequency modulation pulse signal secondary correction method, a radar device linear frequency modulation pulse signal secondary correction system, and electronic equipment. Background Art

[0002] When the radar equipment is working, it needs to generate high-quality linear frequency modulation pulse signals. The commonly used linear frequency modulation pulse signal generation method first constructs a mathematical model of the linear frequency modulation pulse baseband signal, extracts the real part and the imaginary part for scale transformation, and forms the in-phase data and quadrature data of the baseband signal; initializes and configures the RAM inside the FPGA, and configures the in-phase and quadrature data into two RAMs respectively; reads the two RAMs simultaneously under clock control, and performs digital-to-analog conversion on the read data to form an in-phase baseband analog signal and a quadrature baseband analog signal; low-pass filters the in-phase baseband analog signal and the quadrature baseband analog signal respectively, and orthogonally modulates and band-pass filters the filtered in-phase baseband analog signal and the quadrature baseband analog signal to obtain an uncorrected intermediate frequency signal, which is corrected once to obtain the required linear frequency modulation pulse signal.

[0003] When there is a large imbalance between the generating branch of the in-phase baseband analog signal and the generating branch of the orthogonal baseband analog signal, the quality of the linear frequency modulation pulse signal obtained after one correction is not high. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a radar device linear frequency modulation pulse signal secondary correction method, a radar device linear frequency modulation pulse signal secondary correction system, and an electronic device.

[0005] In view of this, the technical solution provided by the present invention is:

[0006] In a first aspect, a method for secondary correction of a linear frequency modulation pulse signal of a radar device includes: generating an intermediate frequency signal based on a linear frequency modulation pulse baseband signal; correcting the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal; and correcting the intermediate frequency primary correction signal through curve fitting and sampling to obtain an intermediate frequency secondary correction signal.

[0007] In some embodiments, the generation of an intermediate frequency signal based on a linear frequency modulated pulse baseband signal includes: extracting the linear frequency modulated pulse baseband signal to obtain a real sequence and an imaginary sequence of the linear frequency modulated pulse baseband signal; scaling the real sequence and the imaginary sequence to obtain baseband in-phase data and baseband quadrature data; performing digital-to-analog conversion on the baseband in-phase data and the baseband quadrature data to form an I baseband analog signal and a Q baseband analog signal; and performing quadrature modulation on the I baseband analog signal and the Q baseband analog signal to synthesize one intermediate frequency signal.

[0008] In some embodiments, the intermediate frequency signal is corrected through curve fitting and sampling to obtain an intermediate frequency primary correction signal, including: based on the intermediate frequency signal, obtaining corresponding first modulus sampling data and first phase error sampling data; based on the first modulus sampling data and the first phase error sampling data, obtaining primary correction data; based on the primary correction data, obtaining the intermediate frequency primary correction signal.

[0009] In some embodiments, obtaining corresponding first modulus sampling data and first phase error sampling data based on the intermediate frequency signal includes: sampling and quantizing the intermediate frequency primary correction signal to obtain first sampling data; performing Hilbert transform on the first sampling data to obtain first transformation data; confirming the first modulus and the corresponding first phase error of the first transformation data; performing curve fitting on the first modulus to obtain a first modulus value curve, and performing curve fitting on the first phase error to obtain a first phase error curve; and performing interval sampling and quantization on the first modulus curve and the first phase error curve, respectively, to obtain the first modulus sampling data and the first phase error sampling data accordingly.

[0010] In some embodiments, the intermediate frequency primary correction signal is obtained based on the primary correction data, including: extracting the primary correction data to obtain a first correction real part sequence and a first correction imaginary part sequence of the primary correction data; scaling the first correction real part sequence and the first correction imaginary part sequence to obtain first correction baseband in-phase data and first correction baseband quadrature data; performing digital-to-analog conversion on the first correction baseband in-phase data and the first correction baseband quadrature data to form a first correction I baseband analog signal and a first correction Q baseband analog signal; and performing quadrature modulation on the first correction I baseband analog signal and the first correction Q baseband analog signal to synthesize one intermediate frequency primary correction signal.

[0011] In some embodiments, the intermediate frequency primary correction signal is corrected by curve fitting and sampling to obtain an intermediate frequency secondary correction signal, including: obtaining corresponding second modulus sampling data and second phase error sampling data based on the intermediate frequency signal; obtaining secondary correction data based on the first modulus sampling data and the first phase error sampling data, and the second modulus sampling data and the second phase error sampling data; and obtaining the intermediate frequency secondary correction signal based on the secondary correction data.

[0012] In some embodiments, obtaining corresponding second modulus value sampling data and second phase error sampling data based on the intermediate frequency signal includes: sampling and quantizing the intermediate frequency primary correction signal to obtain second sampling data; performing Hilbert transform on the second sampling data to obtain second transformation data; confirming the second modulus value and the corresponding second phase error of the second transformation data; performing curve fitting on the second modulus value to obtain a second modulus value curve, and performing curve fitting on the second phase error to obtain a second phase error curve; and performing interval sampling and quantization on the second modulus value curve and the second phase error curve, respectively, to obtain the second modulus value sampling data and the second phase error sampling data accordingly.

[0013] In some embodiments, the intermediate frequency secondary correction signal is obtained based on the secondary correction data, including: extracting the secondary correction data to obtain a second correction real part sequence and a second correction imaginary part sequence of the secondary correction data; scaling the second correction real part sequence and the second correction imaginary part sequence to obtain second correction baseband in-phase data and second correction baseband quadrature data; performing digital-to-analog conversion on the second correction baseband in-phase data and the second correction baseband quadrature data to form a second correction I baseband analog signal and a second correction Q baseband analog signal; and performing quadrature modulation on the second correction I baseband analog signal and the second correction Q baseband analog signal to synthesize one intermediate frequency secondary correction signal.

[0014] In a second aspect, the present invention also provides a secondary correction system for a linear frequency modulation pulse signal of a radar device, comprising: an intermediate frequency signal generating module, used to generate an intermediate frequency signal based on a linear frequency modulation pulse baseband signal; a primary correction module, used to correct the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal; and a secondary correction module, used to correct the intermediate frequency primary correction signal through curve fitting and sampling to obtain an intermediate frequency secondary correction signal.

[0015] In a third aspect, the present invention further provides an electronic device comprising at least one processor and at least one memory, wherein the memory stores a computer program, and the processor is used to read the computer program in the memory and execute the secondary correction method for the linear frequency modulation pulse signal of the radar device described in the first aspect.

[0016] The present invention achieves the following significant beneficial effects:

[0017] This method solves the problem of low quality of linear frequency modulation pulse signals generated by common methods. At present, this method has been successfully applied in radar equipment test prototypes. The test results show that the linear frequency modulation pulse signal obtained by this method has high quality, and the peak sidelobe ratio parameter and compression width parameter are close to the theoretical value, which meets the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flowchart of a method for secondary correction of a linear frequency modulation pulse signal of a radar device according to some embodiments of the present invention.

[0019] Figure 2 The present invention is a flowchart of a method for secondary correction of a linear frequency modulation pulse signal of a radar device according to some other embodiments of the present invention.

[0020] Figure 3 The present invention is a flowchart of a method for secondary correction of a linear frequency modulation pulse signal of a radar device according to some other embodiments of the present invention.

[0021] Figure 4 Schematic diagram of the architecture of a secondary correction system for linear frequency modulation pulse signals of a radar device according to some embodiments of the present invention.

[0022] Figure 5 Schematic diagram of electronic devices according to some embodiments of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0024] It should be noted that, in order to clearly explain the content of the present invention, the present invention specifically cites multiple embodiments to further illustrate different implementations of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity of explanation, the contents mentioned in the previous embodiments are often omitted in the subsequent embodiments. Therefore, the contents not mentioned in the subsequent embodiments can refer to the previous embodiments accordingly.

[0025] Although the invention can be extended in various forms of modification and substitution, some specific implementation examples are listed in the specification and described in detail. It should be understood that the starting point of the inventor is not to limit the invention to the specific embodiments described. On the contrary, the starting point of the inventor is to protect all improvements, equivalent substitutions and modifications made within the spirit or scope defined by this claim. The same component number may be used in all drawings to represent the same or similar parts.

[0026] In order to solve the above technical problems, the present invention provides a radar device linear frequency modulation pulse signal secondary correction method, such as Figure 1 As shown, the radar device linear frequency modulation pulse signal secondary correction method may include steps S11 to S13, which are described in detail below.

[0027] Step S11, generating an intermediate frequency signal based on the linear frequency modulation pulse baseband signal.

[0028] In the embodiment of the present invention, the linear frequency modulation pulse signal of the radar device may be converted first, and the real part and the imaginary part of the baseband signal may be extracted and converted into an intermediate frequency signal through digital-to-analog conversion.

[0029] Step S12, correcting the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal.

[0030] In the embodiment of the present invention, a series of data processing may be performed on the intermediate frequency signal, including curve fitting, and then the fitted curve is sampled and corrected according to the sampled data to obtain a corrected signal.

[0031] Step S13, correcting the intermediate frequency primary correction signal through curve fitting and sampling to obtain an intermediate frequency secondary correction signal.

[0032] In the embodiment of the present invention, the first correction signal after the first correction is subjected to a second correction. Through curve fitting, the fitted curve is sampled, and data correction is performed to finally obtain the result of the second correction, that is, the intermediate frequency secondary correction signal. The linear frequency modulation pulse signal obtained by the method of the embodiment of the present invention has high quality, and the peak sidelobe ratio parameter and the compression width parameter are close to the theoretical value, meeting the use requirements.

[0033] In some embodiments, the present invention can first build a radar equipment linear frequency modulation pulse signal secondary correction system, including: an intermediate frequency signal generation module, a primary correction module and a secondary correction module, which are respectively used to execute step S11, step S12 and step S13.

[0034] In some embodiments, step S11, generating an intermediate frequency signal based on a linear frequency modulated pulse baseband signal, may include: extracting the linear frequency modulated pulse baseband signal to obtain a real sequence and an imaginary sequence of the linear frequency modulated pulse baseband signal; scaling the real sequence and the imaginary sequence to obtain baseband in-phase data and baseband quadrature data; performing digital-to-analog conversion on the baseband in-phase data and the baseband quadrature data to form an I baseband analog signal and a Q baseband analog signal; and performing quadrature modulation on the I baseband analog signal and the Q baseband analog signal to synthesize an intermediate frequency signal.

[0035] In the embodiment of the present invention, the linear frequency modulation pulse baseband signal

[0036]

[0037] The real and imaginary parts of the linear frequency modulated pulse baseband signal r(n) are extracted to obtain the real part r I (n) and the imaginary part r Q (n), that is, the real part sequence and the imaginary part sequence; for r I (n) and r Q (n) Scale transformation is performed to obtain the uncorrected baseband in-phase data r′ I (n) and baseband quadrature data r′ Q (n):

[0038] r′ I (n) = r I (n)·(K-1)+K,r′ Q (n) = r Q (n)·(K-1)+K

[0039] r′ I (n) and r′ Q The data width of (n) is L; K is the scale conversion rate, K = 2 L-1 ; j is the imaginary unit, e j[·] is a complex number representation; n is the index value of the time domain data point, n = 1, 2, ..., N; N is the length of the data sample, N = f s0 ·τ, f s0 is the data rate, τ is the pulse width; μ is the FM slope, μ=B / τ, B is the FM bandwidth.

[0040] For r′ I (n) and r′ Q (n) Perform digital-to-analog conversion, the conversion frequency is equal to the data rate f s0 , forming an uncorrected I, Q baseband analog signal x I (t) and x Q (t), namely baseband in-phase data and baseband quadrature data; for x I (t) and xQ (t) Perform quadrature modulation:

[0041] x(t)=x I (t)cos(2πf0t)-x Q (t)sin(2πf0t),

[0042] Synthesize an uncorrected intermediate frequency signal x(t), where t is the time parameter and f0 is the center frequency.

[0043] In some embodiments, Figure 2 As shown, step S12, correcting the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal, may include: step S121, obtaining corresponding first modulus sampling data and first phase error sampling data based on the intermediate frequency signal; step S122, obtaining primary correction data based on the first modulus sampling data and the first phase error sampling data; step S123, obtaining an intermediate frequency primary correction signal based on the primary correction data.

[0044] By using the method of this embodiment, the intermediate frequency signal can be corrected with high quality.

[0045] In some embodiments, step S121, based on the intermediate frequency signal, obtaining the corresponding first modulus value sampling data and first phase error sampling data, can include: sampling and quantizing the intermediate frequency primary correction signal to obtain the first sampling data; performing Hilbert transform on the first sampling data to obtain the first transformation data; confirming the first modulus value and the corresponding first phase error of the first transformation data; performing curve fitting on the first modulus value to obtain the first modulus value curve, and performing curve fitting on the first phase error to obtain the first phase error curve; performing interval sampling and quantization on the first modulus value curve and the first phase error curve, respectively, to obtain the first modulus value sampling data and the first phase error sampling data accordingly.

[0046] In some embodiments, step S123, based on the primary correction data, obtains an intermediate frequency primary correction signal, including: extracting the primary correction data to obtain a first correction real part sequence and a first correction imaginary part sequence of the primary correction data; scaling the first correction real part sequence and the first correction imaginary part sequence respectively to obtain first correction baseband in-phase data and first correction baseband quadrature data; performing digital-to-analog conversion on the first correction baseband in-phase data and the first correction baseband quadrature data respectively to form a first correction I baseband analog signal and a first correction Q baseband analog signal; performing orthogonal modulation on the first correction I baseband analog signal and the first correction Q baseband analog signal to synthesize an intermediate frequency primary correction signal.

[0047] In the embodiment of the present invention, the uncorrected intermediate frequency signal x(t) can be sampled and quantized to obtain sampled data x(m), that is, first sampled data. A discrete Hilbert transform is performed on x(m) to obtain a transform result x h (m), namely the first transformed data. h (m) is a real number, calculate x(m)+jx h (m) modulus α1(m), that is, the first modulus: α1(m)=|x(m)+jx h (m)|; calculate x(m)+jx h The phase error of (m) is β1(m), that is, the first phase error:

[0048]

[0049] Where m is the index value of the time domain data point, m = 1, 2, ..., M; M is the length of the sampled data, M = f s1 ·τ, f s1 is the sampling frequency,

[0050] f s1 Selection principle: f s1 ≥5(f0+B / 2).

[0051] The polynomial degree is set to p1, and a polynomial curve is fitted to α1(m) to obtain a fitting curve f1(t), i.e., the first modulus value curve; the polynomial degree is set to q1, and a polynomial curve is fitted to β1(m) to obtain a fitting curve g1(t), i.e., the first phase error curve; f1(t) and g1(t) are sampled and quantized at equal intervals, respectively, with the number of sampling points being equal to the length N of the data sample, to obtain data α1(n) and β1(n), i.e., the first modulus value sampling data and the first phase error sampling data.

[0052] Calculate the corrected data v(n), that is, the corrected data:

[0053]

[0054] v(n) is a complex number, extract the real part v of v(n) I (n) and the imaginary part v Q (n), namely the first corrected real part sequence and the first corrected imaginary part sequence. I (n) and v Q (n) Perform a scale transformation to obtain the corrected baseband in-phase data v′ I (n) and baseband quadrature data v′ Q (n), namely, the first corrected baseband in-phase data and the first corrected baseband quadrature data:

[0055] v′I (n) = v I (n)·(K-1)+K,v′ Q (n) = v Q (n)·(K-1)+K

[0056] For v′ I (n) and v′ Q (n) Perform digital-to-analog conversion, the conversion frequency is equal to the data rate f s0 , forming a corrected I, Q baseband analog signal y I (t) and y Q (t), namely the first corrected I baseband analog signal and the first corrected Q baseband analog signal; I (t) and y Q (t) Perform quadrature modulation:

[0057] y(t)=y I (t)cos(2πf0t)-y Q (t)sin(2πf0t),

[0058] The intermediate frequency signal y(t) after the primary correction is synthesized, that is, the intermediate frequency primary correction signal.

[0059] Through the correction method of the embodiment of the present invention, a more accurate intermediate frequency signal can be obtained by sampling, performing curve fitting, sampling the curve, and then performing data processing and correction.

[0060] In some embodiments, Figure 3 As shown, step S13, correcting the intermediate frequency primary correction signal through curve fitting and sampling to obtain the intermediate frequency secondary correction signal, may include: step S131, obtaining the corresponding second modulus sampling data and second phase error sampling data based on the intermediate frequency signal; step S132, obtaining secondary correction data based on the first modulus sampling data and the first phase error sampling data, and the second modulus sampling data and the second phase error sampling data; step S133, obtaining the intermediate frequency secondary correction signal based on the secondary correction data.

[0061] In the embodiment of the present invention, the linear frequency modulation pulse signal of the radar device is corrected for the second time in the above manner, thereby improving the signal quality. In addition, in the process of the second correction, the data in the first correction is also applied, thereby improving the accuracy of the second correction and reducing the error.

[0062] In some embodiments, step S131, based on the intermediate frequency signal, obtaining corresponding second modulus value sampling data and second phase error sampling data, can include: sampling and quantizing the intermediate frequency primary correction signal to obtain second sampling data; performing Hilbert transform on the second sampling data to obtain second transformation data; confirming the second modulus value and the corresponding second phase error of the second transformation data; performing curve fitting on the second modulus value to obtain a second modulus value curve, and performing curve fitting on the second phase error to obtain a second phase error curve; performing interval sampling and quantization on the second modulus value curve and the second phase error curve, respectively, to obtain second modulus value sampling data and second phase error sampling data accordingly.

[0063] In some embodiments, step S133, based on the secondary correction data, obtaining an intermediate frequency secondary correction signal, may include: extracting the secondary correction data to obtain a second correction real sequence and a second correction imaginary sequence of the secondary correction data; respectively scaling the second correction real sequence and the second correction imaginary sequence to obtain second correction baseband in-phase data and second correction baseband quadrature data; respectively performing digital-to-analog conversion on the second correction baseband in-phase data and the second correction baseband quadrature data to form a second correction I baseband analog signal and a second correction Q baseband analog signal; and performing orthogonal modulation on the second correction I baseband analog signal and the second correction Q baseband analog signal to synthesize an intermediate frequency secondary correction signal.

[0064] In the embodiment of the present invention, the intermediate frequency signal y(t) after the primary correction can be sampled and quantized to obtain the sampled data y(m), that is, the second sampled data. Discrete Hilbert transform is performed on y(m) to obtain the transformed result y h (m), that is, the secondary transformation data. h (m) is a real number, calculate y(m)+jy h (m), i.e., the second modulus: α2(m)=|y(m)+jy h (m)|; calculate y(m)+jy h The phase error of (m) is β2(m), that is, the second phase error:

[0065]

[0066] Set the polynomial degree to p2, perform polynomial curve fitting on α2(m), and obtain the fitting curve f2(t), i.e., the second modulus value curve; set the polynomial degree to q2, perform polynomial curve fitting on β2(m), and obtain the fitting curve g2(t), i.e., the second phase error curve; perform equal-interval sampling and quantization on f2(t) and g2(t), respectively, with the number of sampling points equal to the length N of the data sample, and obtain the data α2(n) and β2(n), i.e., the second modulus value sampling data and the second phase error sampling data. Calculate the data w(n) after secondary correction, i.e., the secondary correction data:

[0067]

[0068] It can be seen that in the embodiment of the present invention, α1(n) and β1(n), namely the first modulus sampling data and the first phase error sampling data, are also applied during the second calibration process. In this way, the error can be further reduced, the calibration effect can be improved, and the signal quality can be guaranteed.

[0069] w(n) is a complex number, extract the real part w of w(n) I (n) and the imaginary part w Q (n), namely, the second corrected real part sequence and the second corrected imaginary part sequence; for w I (n) and w Q (n) Perform a scale transformation to obtain the baseband in-phase data w′ after secondary correction I (n) and baseband quadrature data w′ Q (n), namely, the second corrected baseband in-phase data and the second corrected baseband quadrature data:

[0070] w′ I (n) = w I (n)·(K-1)+K,w′ Q (n) = w Q (n)·(K-1)+K

[0071] For w′ I (n) and w′ Q (n) Perform digital-to-analog conversion, the conversion frequency is equal to the data rate f s0 , forming the I, Q baseband analog signal z after secondary correction I (t) and z Q (t), namely, the second corrected I baseband analog signal and the second corrected Q baseband analog signal; I (t) and z Q (t) Perform quadrature modulation:

[0072] z(t)=z I (t)cos(2πf0t)-z Q(t)sin(2πf0t),

[0073] The intermediate frequency signal z(t) after the secondary correction is synthesized, that is, the intermediate frequency secondary correction signal.

[0074] Compared with some signal processing methods that only use one correction, the radar equipment linear frequency modulation pulse signal secondary correction method provided by the present invention ensures the quality of the linear frequency modulation pulse signal by re-correcting the result of the first correction, and the peak sidelobe ratio parameter and the compression width parameter are close to the theoretical value, meeting the use requirements. Moreover, the specific method of the second correction of the present invention can further reduce the error and ensure the signal quality.

[0075] Based on the same inventive concept, the present invention also provides a radar device linear frequency modulation pulse signal secondary correction system 100, such as Figure 4 As shown, the radar device linear frequency modulation pulse signal secondary correction system 100 may include: an intermediate frequency signal generation module 110, which is used to generate an intermediate frequency signal based on the linear frequency modulation pulse baseband signal; a primary correction module 120, which is used to correct the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal; and a secondary correction module 130, which is used to correct the intermediate frequency primary correction signal through curve fitting and sampling to obtain an intermediate frequency secondary correction signal.

[0076] In some embodiments, the intermediate frequency signal generating module 110 can generate the intermediate frequency signal in the following manner: extract the linear frequency modulated pulse baseband signal to obtain the real sequence and imaginary sequence of the linear frequency modulated pulse baseband signal; scale the real sequence and the imaginary sequence respectively to obtain baseband in-phase data and baseband quadrature data; perform digital-to-analog conversion on the baseband in-phase data and the baseband quadrature data respectively to form an I baseband analog signal and a Q baseband analog signal; perform orthogonal modulation on the I baseband analog signal and the Q baseband analog signal to synthesize an intermediate frequency signal.

[0077] In some embodiments, the primary correction module 120 can correct the intermediate frequency signal in the following manner to obtain an intermediate frequency primary correction signal: based on the intermediate frequency signal, obtain the corresponding first modulus sampling data and first phase error sampling data; based on the first modulus sampling data and the first phase error sampling data, obtain primary correction data; based on the primary correction data, obtain an intermediate frequency primary correction signal.

[0078] In some embodiments, the primary correction module 120 can obtain the corresponding first modulus value sampling data and first phase error sampling data in the following manner: sampling and quantizing the intermediate frequency primary correction signal to obtain first sampling data; performing Hilbert transform on the first sampling data to obtain first transformation data; confirming the first modulus value and the corresponding first phase error of the first transformation data; performing curve fitting on the first modulus value to obtain a first modulus value curve, and performing curve fitting on the first phase error to obtain a first phase error curve; performing interval sampling and quantization on the first modulus value curve and the first phase error curve, respectively, to obtain first modulus value sampling data and first phase error sampling data accordingly.

[0079] In some embodiments, the primary correction module 120 can obtain an intermediate frequency primary correction signal based on the primary correction data in the following manner: extract the primary correction data to obtain a first correction real part sequence and a first correction imaginary part sequence of the primary correction data; scale the first correction real part sequence and the first correction imaginary part sequence respectively to obtain first correction baseband in-phase data and first correction baseband orthogonal data; perform digital-to-analog conversion on the first correction baseband in-phase data and the first correction baseband orthogonal data respectively to form a first correction I baseband analog signal and a first correction Q baseband analog signal; perform orthogonal modulation on the first correction I baseband analog signal and the first correction Q baseband analog signal to synthesize an intermediate frequency primary correction signal.

[0080] In some embodiments, the secondary correction module 130 can correct the intermediate frequency primary correction signal through curve fitting and sampling in the following manner to obtain an intermediate frequency secondary correction signal: based on the intermediate frequency signal, obtain the corresponding second modulus sampling data and second phase error sampling data; based on the first modulus sampling data and the first phase error sampling data, as well as the second modulus sampling data and the second phase error sampling data, obtain secondary correction data; based on the secondary correction data, obtain an intermediate frequency secondary correction signal.

[0081] In some embodiments, the secondary correction module 130 can obtain corresponding second modulus sampling data and second phase error sampling data based on the intermediate frequency signal in the following manner: sampling and quantizing the intermediate frequency primary correction signal to obtain second sampling data; performing Hilbert transform on the second sampling data to obtain second transformed data; confirming the second modulus and the corresponding second phase error of the second transformed data; performing curve fitting on the second modulus to obtain a second modulus value curve, and performing curve fitting on the second phase error to obtain a second phase error curve; performing interval sampling and quantization on the second modulus value curve and the second phase error curve, respectively, to obtain second modulus sampling data and second phase error sampling data accordingly.

[0082] In some embodiments, the secondary correction module 130 can obtain an intermediate frequency secondary correction signal based on the secondary correction data in the following manner: extract the secondary correction data to obtain a second correction real part sequence and a second correction imaginary part sequence of the secondary correction data; scale the second correction real part sequence and the second correction imaginary part sequence respectively to obtain second correction baseband in-phase data and second correction baseband orthogonal data; perform digital-to-analog conversion on the second correction baseband in-phase data and the second correction baseband orthogonal data respectively to form a second correction I baseband analog signal and a second correction Q baseband analog signal; perform orthogonal modulation on the second correction I baseband analog signal and the second correction Q baseband analog signal to synthesize an intermediate frequency secondary correction signal.

[0083] The specific implementation method and related effects of the above radar device linear frequency modulation pulse signal secondary correction system 100 have been described in the relevant embodiments of the aforementioned radar device linear frequency modulation pulse signal secondary correction method, and will not be repeated here.

[0084] Based on the same inventive concept, the present invention also provides an electronic device 400, such as Figure 5 As shown, the electronic device 400 may include at least one processor 410 and at least one memory 420, wherein the memory stores a computer program, and the processor is used to read the computer program in the memory and execute the secondary correction method of the linear frequency modulation pulse signal of the radar device as in any of the aforementioned embodiments.

[0085] Based on the same inventive concept, the present invention also provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are used to enable a computer to execute the secondary correction method for linear frequency modulation pulse signals of a radar device as described in any of the aforementioned embodiments.

[0086] The specific implementation methods and related effects of the above electronic devices and computer-readable storage media have been described in the aforementioned related embodiments and will not be repeated here.

[0087] The present invention achieves the following significant beneficial effects:

[0088] This method solves the problem of low quality of linear frequency modulation pulse signals generated by common methods. At present, this method has been successfully applied in radar equipment test prototypes. The test results show that the linear frequency modulation pulse signal obtained by this method has high quality, and the peak sidelobe ratio parameter and compression width parameter are close to the theoretical value, which meets the use requirements.

[0089] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom still fall within the scope of protection of the present invention.

Claims

1. A method for secondary correction of linear frequency modulation pulse signal of radar equipment, characterized in that: The radar device linear frequency modulation pulse signal secondary correction method comprises: Generate an intermediate frequency signal based on the linear frequency modulation pulse baseband signal; The method of generating an intermediate frequency signal based on the linear frequency modulation pulse baseband signal comprises: Extracting the linear frequency modulation pulse baseband signal to obtain a real part sequence and an imaginary part sequence of the linear frequency modulation pulse baseband signal; Respectively performing scale transformation on the real part sequence and the imaginary part sequence to obtain baseband in-phase data and baseband quadrature data; Respectively performing digital-to-analog conversion on the baseband in-phase data and the baseband quadrature data to form an I baseband analog signal and a Q baseband analog signal; Performing quadrature modulation on the I baseband analog signal and the Q baseband analog signal to synthesize one intermediate frequency signal; Correcting the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal; The method of correcting the intermediate frequency signal by curve fitting and sampling to obtain an intermediate frequency primary correction signal includes: Based on the intermediate frequency signal, obtaining corresponding first modulus value sampling data and first phase error sampling data; The obtaining corresponding first modulus value sampling data and first phase error sampling data based on the intermediate frequency signal includes: Sampling and quantizing the intermediate frequency signal to obtain first sampling data; Performing Hilbert transform on the first sampled data to obtain first transformed data; confirming a first modulus value of the first transformed data and a corresponding first phase error; Performing curve fitting on the first modulus to obtain a first modulus curve, and performing curve fitting on the first phase error to obtain a first phase error curve; Performing interval sampling and quantization on the first modulus value curve and the first phase error curve respectively, and obtaining the first modulus value sampling data and the first phase error sampling data accordingly; Obtaining primary correction data based on the first modulus value sampling data and the first phase error sampling data; Based on the primary correction data, obtaining the intermediate frequency primary correction signal; The step of obtaining the intermediate frequency primary correction signal based on the primary correction data includes: Extracting the primary correction data to obtain a first correction real part sequence and a first correction imaginary part sequence of the primary correction data; Respectively performing scale transformation on the first correction real part sequence and the first correction imaginary part sequence to obtain first correction baseband in-phase data and first correction baseband orthogonal data; Respectively performing digital-to-analog conversion on the first correction baseband in-phase data and the first correction baseband quadrature data to form a first correction I baseband analog signal and a first correction Q baseband analog signal; Performing quadrature modulation on the first correction I baseband analog signal and the first correction Q baseband analog signal to synthesize one intermediate frequency primary correction signal; The intermediate frequency primary correction signal is corrected by curve fitting and sampling to obtain an intermediate frequency secondary correction signal; The method of correcting the intermediate frequency primary correction signal by curve fitting and sampling to obtain an intermediate frequency secondary correction signal includes: Based on the intermediate frequency primary correction signal, corresponding second modulus value sampling data and second phase error sampling data are obtained; The obtaining of corresponding second modulus value sampling data and second phase error sampling data based on the intermediate frequency primary correction signal includes: Sampling and quantizing the intermediate frequency primary correction signal to obtain second sampling data; Performing Hilbert transform on the second sampled data to obtain second transformed data; confirming a second modulus value and a corresponding second phase error of the second transformed data; Performing curve fitting on the second modulus to obtain a second modulus curve, and performing curve fitting on the second phase error to obtain a second phase error curve; performing interval sampling and quantization on the second modulus value curve and the second phase error curve respectively, and obtaining the second modulus value sampling data and the second phase error sampling data accordingly; Obtaining secondary correction data based on the first modulus value sampling data and the first phase error sampling data, and the second modulus value sampling data and the second phase error sampling data; Based on the secondary correction data, obtaining the intermediate frequency secondary correction signal; The obtaining the intermediate frequency secondary correction signal based on the secondary correction data includes: Extracting the secondary correction data to obtain a second correction real part sequence and a second correction imaginary part sequence of the secondary correction data; Respectively performing scale transformation on the second correction real part sequence and the second correction imaginary part sequence to obtain second correction baseband in-phase data and second correction baseband orthogonal data; Respectively performing digital-to-analog conversion on the second correction baseband in-phase data and the second correction baseband quadrature data to form a second correction I baseband analog signal and a second correction Q baseband analog signal; The second correction I baseband analog signal and the second correction Q baseband analog signal are orthogonally modulated to synthesize one intermediate frequency secondary correction signal.

2. A radar equipment linear frequency modulation pulse signal secondary correction system, characterized in that: The radar equipment linear frequency modulation pulse signal secondary correction system comprises: An intermediate frequency signal generating module, used for generating an intermediate frequency signal based on a linear frequency modulation pulse baseband signal; The intermediate frequency signal generation module generates the intermediate frequency signal in the following manner: extracting the linear frequency modulation pulse baseband signal to obtain the real sequence and the imaginary sequence of the linear frequency modulation pulse baseband signal; performing scale transformation on the real sequence and the imaginary sequence respectively to obtain baseband in-phase data and baseband quadrature data; performing digital-to-analog conversion on the baseband in-phase data and the baseband quadrature data respectively to form an I baseband analog signal and a Q baseband analog signal; performing quadrature modulation on the I baseband analog signal and the Q baseband analog signal to synthesize an intermediate frequency signal; A primary correction module, used to correct the intermediate frequency signal through curve fitting and sampling to obtain an intermediate frequency primary correction signal; The primary correction module corrects the intermediate frequency signal in the following manner to obtain an intermediate frequency primary correction signal: based on the intermediate frequency signal, obtain the corresponding first modulus sampling data and first phase error sampling data; based on the first modulus sampling data and the first phase error sampling data, obtain primary correction data; based on the primary correction data, obtain the intermediate frequency primary correction signal; The primary correction module obtains the corresponding first modulus value sampling data and first phase error sampling data in the following manner: sampling and quantizing the intermediate frequency primary correction signal to obtain the first sampling data; performing Hilbert transform on the first sampling data to obtain the first transformation data; confirming the first modulus value and the corresponding first phase error of the first transformation data; performing curve fitting on the first modulus value to obtain the first modulus value curve, and performing curve fitting on the first phase error to obtain the first phase error curve; performing interval sampling and quantization on the first modulus value curve and the first phase error curve respectively, and obtaining the first modulus value sampling data and the first phase error sampling data accordingly; The primary correction module obtains an intermediate frequency primary correction signal based on the primary correction data in the following manner: extracting the primary correction data to obtain a first correction real sequence and a first correction imaginary sequence of the primary correction data; performing scale transformation on the first correction real sequence and the first correction imaginary sequence respectively to obtain first correction baseband in-phase data and first correction baseband quadrature data; performing digital-to-analog conversion on the first correction baseband in-phase data and the first correction baseband quadrature data respectively to form a first correction I baseband analog signal and a first correction Q baseband analog signal; performing orthogonal modulation on the first correction I baseband analog signal and the first correction Q baseband analog signal to synthesize a path of intermediate frequency primary correction signals; A secondary correction module, used for correcting the intermediate frequency primary correction signal through curve fitting and sampling to obtain an intermediate frequency secondary correction signal; The secondary correction module corrects the intermediate frequency primary correction signal through curve fitting and sampling in the following manner to obtain an intermediate frequency secondary correction signal: based on the intermediate frequency signal, obtain the corresponding second modulus value sampling data and second phase error sampling data; based on the first modulus value sampling data and the first phase error sampling data, and the second modulus value sampling data and the second phase error sampling data, obtain the secondary correction data; based on the secondary correction data, obtain the intermediate frequency secondary correction signal; The secondary correction module obtains corresponding second modulus value sampling data and second phase error sampling data based on the intermediate frequency signal in the following manner: sampling and quantizing the intermediate frequency primary correction signal to obtain second sampling data; performing Hilbert transform on the second sampling data to obtain second transformation data; confirming the second modulus value and the corresponding second phase error of the second transformation data; performing curve fitting on the second modulus value to obtain a second modulus value curve, and performing curve fitting on the second phase error to obtain a second phase error curve; performing interval sampling and quantization on the second modulus value curve and the second phase error curve, respectively, to obtain second modulus value sampling data and second phase error sampling data accordingly; The secondary correction module obtains an intermediate frequency secondary correction signal based on the secondary correction data in the following manner: extracting the secondary correction data to obtain a second correction real sequence and a second correction imaginary sequence of the secondary correction data; performing scale transformation on the second correction real sequence and the second correction imaginary sequence respectively to obtain second correction baseband in-phase data and second correction baseband quadrature data; performing digital-to-analog conversion on the second correction baseband in-phase data and the second correction baseband quadrature data respectively to form a second correction I baseband analog signal and a second correction Q baseband analog signal; performing orthogonal modulation on the second correction I baseband analog signal and the second correction Q baseband analog signal to synthesize an intermediate frequency secondary correction signal.

3. An electronic device, characterized in that: The method comprises at least one processor and at least one memory, wherein the memory stores a computer program, and the processor is used to read the computer program in the memory and execute the method for secondary correction of linear frequency modulation pulse signal of radar equipment according to claim 1.

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