Array antenna amplitude-phase error correction method, apparatus and device, and storage medium

Abstract

The invention discloses an array antenna amplitude and phase error correction method, device and equipment and a storage medium, and relates to the technical field of antenna error correction. Carrying out amplitude phase correction on the received input signal; performing amplitude compensation on the signal after amplitude phase correction; and adopting the target phase compensation factor combination to minimize the image entropy after the signal after the amplitude compensation is imaged so as to carry out phase compensation and obtain an output signal. Amplitude-phase correction and amplitude-phase compensation are carried out on the input signal received by the array antenna, and during phase compensation, the target phase compensation factor combination is introduced to minimize the image entropy, so that the amplitude-phase error between array channels can be accurately corrected, azimuth energy leakage of a strong target point after imaging is avoided, and the imaging accuracy is improved. And higher imaging quality and deformation monitoring precision are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna error correction, and in particular to a method, device, equipment and storage medium for correcting amplitude and phase errors of an array antenna. Background Art

[0002] Due to manufacturing process and engineering errors, array antennas are prone to inconsistencies in shape, position, material, and thickness, thereby introducing amplitude and phase errors between antenna channels. Amplitude and phase errors can cause strong reflective target points in the imaging results to form false target points in azimuth, affecting the observation and deformation monitoring of other targets. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a method, apparatus, device and storage medium for correcting amplitude and phase errors of an array antenna, which can achieve accurate correction of amplitude and phase errors between array channels.

[0004] To achieve the above objectives, an embodiment of the present invention provides a method for correcting amplitude and phase errors of an array antenna, comprising:

[0005] Using each antenna array element to receive the same input signal;

[0006] performing amplitude and phase correction on the received input signal;

[0007] Perform amplitude compensation on the signal after amplitude and phase correction;

[0008] The target phase compensation factor combination is used to minimize the image entropy of the amplitude compensated signal after imaging to perform phase compensation and obtain the output signal.

[0009] As an improvement to the above solution, the target phase compensation factor combination is pre-determined in the following manner:

[0010] generating a matrix to be phase compensated according to the calibration signal received by the antenna array element;

[0011] With the goal of minimizing image entropy, multiple rounds of iterations are performed on the phase compensation factor combination to obtain the target phase compensation factor combination; wherein, in each round of iteration:

[0012] Performing phase compensation on the matrix to be phase compensated by using a combination of phase compensation factors to obtain a matrix to be imaged;

[0013] generating a phase-compensated image according to the matrix to be imaged;

[0014] calculating the image entropy of the phase-compensated image;

[0015] The phase compensation factor combination is updated, and the step of calculating the matrix to be imaged is returned to iterate until the minimum image entropy is obtained.

[0016] As an improvement to the above solution, before performing multiple rounds of iterations on the phase compensation factor combination, the method further includes calculating a phase compensation intermediate matrix for multiple rounds of iterations on the phase compensation factor combination in the following manner:

[0017] generating a pre-phase fine correction matrix according to the matrix to be phase compensated;

[0018] generating a reference image according to the pre-phase fine correction matrix;

[0019] identifying a target range gate based on bright spots in the reference image;

[0020] The pre-phase fine correction matrix is ​​intercepted according to the target range gate to obtain a phase compensation intermediate matrix.

[0021] As an improvement to the above solution, an amplitude compensation matrix is ​​used to perform amplitude compensation on the signal after amplitude and phase correction. The amplitude compensation matrix is ​​pre-determined in the following manner:

[0022] generating a signal to be amplitude compensated according to the calibration signal received by the antenna array element;

[0023] generating an array digital signal matrix according to the signal to be amplitude compensated;

[0024] Performing a Hilbert transform on the distance direction of the array digital signal matrix to obtain a complex analytical matrix;

[0025] Performing a modulo operation on each element of the complex analytic matrix to obtain an amplitude matrix;

[0026] The inverse of each element of the amplitude matrix is ​​taken to obtain an amplitude compensation matrix.

[0027] As an improvement to the above solution, performing amplitude and phase correction on the received input signal includes:

[0028] Performing phase shift processing on the input signal according to a target phase shift coefficient to obtain a phase-corrected signal;

[0029] Amplitude correction is performed on the phase-corrected signal according to a target amplitude coefficient to obtain an amplitude- and phase-corrected signal.

[0030] As an improvement to the above solution, each target phase shift coefficient is determined in advance by the following method:

[0031] The phase shift coefficient is used to perform phase shift processing on the calibration signal received by the antenna array element to be phase corrected to obtain a phase-shifted signal;

[0032] The phase-shifted signal and the phase reference signal are mixed and low-pass filtered to obtain a first DC signal; wherein the phase reference signal is a calibration signal received by a calibration antenna array element or an antenna array element that has previously completed phase correction;

[0033] With the goal of maximizing the first DC signal, the phase shift coefficient is adjusted to obtain a target phase shift coefficient.

[0034] As an improvement to the above solution, each target amplitude coefficient is determined in advance by the following method:

[0035] Performing amplitude correction on the calibration signal to be amplitude corrected of the antenna array element to be amplitude corrected using the amplitude coefficient to obtain an amplitude correction signal;

[0036] performing envelope detection and low-pass filtering on the amplitude-corrected signal to obtain a second DC signal;

[0037] Performing envelope detection and low-pass filtering on the amplitude reference signal to obtain a reference DC signal; wherein the amplitude reference signal is a calibration signal to be amplitude-corrected for a calibration antenna array element or an antenna array element that has previously completed amplitude correction;

[0038] With the goal of making the second DC signal equal to the reference DC signal, the amplitude coefficient is adjusted to obtain a target amplitude coefficient.

[0039] To achieve the above objectives, an embodiment of the present invention further provides an array antenna amplitude and phase error correction device, comprising:

[0040] An array antenna is used to receive the same input signal using each antenna element;

[0041] an amplitude and phase correction module, configured to perform amplitude and phase correction on the received input signal;

[0042] An amplitude compensation module is used to perform amplitude compensation on the signal after amplitude and phase correction;

[0043] The phase compensation module is used to use a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging to perform phase compensation and obtain an output signal.

[0044] To achieve the above-mentioned objectives, an embodiment of the present invention also provides an array antenna amplitude and phase error correction device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the array antenna amplitude and phase error correction method as described in any of the above-mentioned embodiments is implemented.

[0045] To achieve the above-mentioned purpose, an embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the array antenna amplitude and phase error correction method as described in any of the above embodiments.

[0046] Compared to the prior art, the array antenna amplitude and phase error correction method, apparatus, device, and storage medium described in the embodiments of the present invention employ methods in which each antenna element receives the same input signal; performs amplitude and phase correction on the received input signal; performs amplitude compensation on the amplitude and phase corrected signal; and employs a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging to perform phase compensation and obtain an output signal. The embodiments of the present invention perform amplitude and phase correction and amplitude and phase compensation on the input signal received by the array antenna. Furthermore, during phase compensation, by introducing a target phase compensation factor combination to minimize image entropy, they can achieve precise correction of amplitude and phase errors between array channels, avoid azimuthal energy leakage of strong target points after imaging, and achieve higher imaging quality and deformation monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a flow chart of a method for correcting amplitude and phase errors of an array antenna provided by one embodiment of the present invention;

[0048] Figure 2 1 is a schematic diagram of an array antenna amplitude and phase error correction device provided by one embodiment of the present invention;

[0049] Figure 3 is a calibration diagram of a correction coefficient and a compensation factor provided by an embodiment of the present invention;

[0050] Figure 4 is a calibration diagram of an amplitude and phase compensation module provided by an embodiment of the present invention;

[0051] Figure 5 is a schematic diagram of a phase correction module provided by an embodiment of the present invention;

[0052] Figure 6 is a schematic diagram of an amplitude correction module provided by an embodiment of the present invention;

[0053] Figure 7 1 is a schematic diagram of phase error correction of an array antenna provided by an embodiment of the present invention;

[0054] Figure 8 1 is a schematic diagram of amplitude error correction for an array antenna provided by an embodiment of the present invention;

[0055] Figure 9 It is a structural diagram of an array antenna amplitude and phase error correction device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0058] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0060] It is understood that Synthetic Aperture Radar (SAR) is a high-resolution imaging radar that uses synthetic aperture technology to achieve high-frequency and high-precision real-time monitoring tasks. To improve data acquisition efficiency, existing SAR systems are mainly implemented based on array antennas. However, antenna channels are prone to errors in amplitude and phase. The method described in the embodiments of the present invention can solve the above-mentioned technical problems existing in SAR systems, reduce the azimuth leakage of strongly reflecting point targets in MIMO (Multiple Input Multiple Output) ground-based SAR systems, and improve imaging quality. It is worth noting that the array antenna amplitude and phase error correction method described in the present invention can also be applied to other scenarios and is not limited here.

[0061] See also Figure 1 , is a method for correcting amplitude and phase errors of an array antenna provided by an embodiment of the present invention, comprising steps S1 to S4:

[0062] S1, using each antenna array element to receive the same input signal;

[0063] S2. performing amplitude and phase correction on the received input signal;

[0064] S3, performing amplitude compensation on the signal after amplitude and phase correction;

[0065] S4. Using a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging, to perform phase compensation and obtain an output signal.

[0066] It can be understood that the array antenna is composed of multiple antenna elements. For the sake of convenience, in the present invention, it is assumed that the array antenna includes n antenna elements. When each antenna element is used to receive the same input signal, there may be amplitude and phase errors between the channels. Therefore, in step S2, the received input signal is amplitude and phase corrected, wherein the amplitude and phase correction may include phase correction and amplitude correction, and a phase shifter may be used for phase correction, and a variable gain amplifier may be used for amplitude correction; it is worth noting that the amplitude and phase correction in step S2 may be relatively rough. In order to achieve more accurate amplitude and phase correction, in steps S3 and S4, the amplitude and phase corrected signals are also amplitude compensated and phase compensated, and in step S3, an amplitude compensation matrix may be used for amplitude compensation, and in step S4, a target phase compensation factor combination is used for phase compensation.

[0067] Furthermore, corresponding to n antenna array elements, the target phase compensation factor combination includes n target phase compensation factors. Exemplarily, the target phase compensation factor combination can be obtained in advance through iterative calculation. For example, a swarm intelligence algorithm such as a particle swarm algorithm or a genetic algorithm can be used to optimize the phase compensation factor combination with the goal of minimizing image entropy, thereby obtaining the target phase compensation factor combination. Specifically, when calculating the target phase compensation factor combination, a loss function can be constructed, the input of which is n phase compensation factors, and the output is image entropy. The function performs phase compensation on the phase compensation matrix based on the n phase compensation factors, and uses an imaging algorithm to image the phase compensation result, and then calculates the image entropy.

[0068] Specifically, see Figure 2 , is a schematic diagram of the array antenna amplitude and phase error correction provided by an embodiment of the present invention, wherein the phase correction module and the amplitude correction module are used to perform the above-mentioned step S2, and the amplitude and phase compensation module is used to perform the above-mentioned steps S3 and S4. In some implementation schemes, the amplitude and phase compensation module can also be replaced by the amplitude compensation module and the phase compensation module, which is not limited here.

[0069] Further, see Figure 2 When the array antenna is working, the n antenna elements of the array antenna receive the same input signal and output a signal with amplitude and phase errors. The signal passes through the phase correction module and the amplitude correction module in succession, and outputs a signal after amplitude and phase correction. Furthermore, the amplitude and phase corrected signal and the local oscillator signal are input into the downconverter together, and a baseband signal is output. The amplitude and phase compensation module performs amplitude and phase compensation on the baseband signal to obtain the amplitude and phase compensated signal (output signal), which is then transmitted to the downlink device.

[0070] It is worth noting that the phase correction module and the amplitude correction module use correction coefficients (such as phase shift coefficients and amplitude coefficients) to perform rough amplitude and phase correction on the RF signal; the amplitude and phase compensation module can make fine compensation for the amplitude and phase errors introduced by the array antenna in the baseband signal based on the compensation factors (such as the combination of the amplitude compensation matrix and the target phase compensation factor), thereby realizing the amplitude and phase error correction of the array antenna.

[0071] Furthermore, the correction coefficient and the compensation factor can be obtained by pre-calibration.

[0072] Specifically, see Figure 3 , is a calibration diagram of the correction coefficient and compensation factor provided by an embodiment of the present invention, wherein the calibration signal source can generate a center frequency of f cThe single-frequency sinusoidal signal and swept-frequency signal are generated by the calibration signal source. The center frequency is generally the center frequency of the array antenna's operating spectrum. The single-frequency sinusoidal signal generated by the calibration signal source provides a reference for calibrating the correction coefficients of the phase correction module and the amplitude correction module, respectively. The swept-frequency signal generated by the calibration signal source provides a reference for calibrating the compensation factors in the digital domain of the amplitude and phase compensation module.

[0073] Furthermore, the correction module (amplitude correction module and phase correction module) and the amplitude and phase compensation module can be calibrated together or separately. Figure 3 , an example is given to illustrate the calibration process. Specifically, the calibration signal source sends a calibration signal, including the RF signal in the figure and the RF signal after a certain time delay. The RF signal is received by the array antenna and outputs n RF signals with amplitude and phase errors. Then, the phase correction module receives the RF signal with amplitude and phase errors and adjusts the correction coefficient until the phase error of the n signals meets the requirements, thereby obtaining the target phase correction coefficient (such as the target phase shift coefficient). Furthermore, the amplitude correction module receives the output signal of the phase correction module and adjusts the correction coefficient until the amplitude error of the n signals meets the requirements, thereby obtaining the target amplitude correction coefficient (such as the target amplitude coefficient). Furthermore, the downconverter receives the signal output by the amplitude correction module and the RF signal after a certain time delay and outputs a baseband signal. The amplitude and phase compensation module receives the baseband signal and adjusts the compensation factor until the amplitude and phase error of the n signals meet the requirements, thereby obtaining the optimal compensation factor.

[0074] For example, see Figure 4 , is a calibration diagram of the amplitude-phase compensation module provided by an embodiment of the present invention. As can be seen from the figure, the amplitude-phase compensation module performs low-pass filtering on the baseband signal and inputs it into an analog-to-digital converter (ADC) for analog-to-digital conversion to obtain a digital signal; then, the amplitude compensation factor (amplitude compensation matrix) is obtained by performing Hilbert transform and other processing on the digital signal for use in amplitude compensation; further, after receiving the amplitude-compensated signal, phase compensation and imaging are performed, and then the image entropy is calculated and input into the swarm intelligent optimizer. The swarm intelligent optimizer optimizes the phase compensation factor based on the image entropy and returns to the phase compensation step. After multiple rounds of iteration, the target phase compensation factor combination is obtained for phase compensation, thereby completing the calibration of the amplitude-phase compensation module.

[0075] Compared with the prior art, the embodiments of the present invention perform amplitude-phase correction and amplitude-phase compensation on the input signals received by the array antenna. Moreover, during phase compensation, the target phase compensation factor combination is introduced to minimize image entropy, thereby achieving precise correction of amplitude-phase errors between array channels, avoiding azimuthal energy leakage of strong target points after imaging, and achieving higher imaging quality and deformation monitoring accuracy.

[0076] As an optional implementation manner, performing amplitude and phase correction on the received input signal includes:

[0077] Performing phase shift processing on the input signal according to a target phase shift coefficient to obtain a phase-corrected signal;

[0078] Amplitude correction is performed on the phase-corrected signal according to a target amplitude coefficient to obtain an amplitude- and phase-corrected signal.

[0079] As an optional implementation manner, each of the target phase shift coefficients is determined in advance by:

[0080] The phase shift coefficient is used to perform phase shift processing on the calibration signal received by the antenna array element to be phase corrected to obtain a phase-shifted signal;

[0081] The phase-shifted signal and the phase reference signal are mixed and low-pass filtered to obtain a first DC signal; wherein the phase reference signal is a calibration signal received by a calibration antenna array element or an antenna array element that has previously completed phase correction;

[0082] With the goal of maximizing the first DC signal, the phase shift coefficient is adjusted to obtain a target phase shift coefficient.

[0083] See also Figure 5 , is a schematic diagram of a phase correction module provided in one embodiment of the present invention. It can be understood that, corresponding to n antenna array elements, the phase correction module has n input channels and n output channels, that is, it can transmit n signals, and the phase correction module has built-in n-1 phase shifters, n-1 mixers, n-1 low-pass filters and 1 control unit. The DC signals 1 to (n-1) are the first DC signals output by each channel. Among them, the antenna array element corresponding to the signal channel without a phase shifter is the above-mentioned calibration antenna array element, and the other antenna array elements with phase shifters are called antenna array elements to be phase corrected, and the phase shift coefficient of the phase shifter is controlled by the control unit.

[0084] For example, when adjusting the phase shift coefficient of the phase shifter, all antenna array elements to be phase-calibrated can use the same phase reference antenna array element, that is, the calibration antenna array element is used as the phase reference antenna array element; further, according to the calibration order, the antenna array element that has completed the phase shift coefficient calibration first can be used as the phase reference antenna array element. Figure 3 It can be known that the input signal of the phase correction module is the calibration signal received by the array antenna, and therefore, the phase reference signal is the calibration signal received by the phase reference antenna array element.

[0085] Exemplarily, the calibration process of the phase shift coefficients of each phase shifter is described through the following steps T11 to T14:

[0086] T11. The calibration signal source generates a sinusoidal signal of a certain frequency (calibration signal), which is collected by the array antenna and input into the phase correction module;

[0087] T12, the phase correction module takes the first signal as the phase reference signal, inputs the first signal and the second signal into the mixer, and performs low-pass filtering on the output of the mixer to obtain a first DC signal;

[0088] T13. The control unit adjusts the phase shift coefficient of the second phase shifter based on a real-time optimization algorithm, such as a PID (Proportional-Integral-Derivative) algorithm, to maximize the first DC signal so that the two sinusoidal signals output by output channel 1 and output channel 2 are in phase with each other after the phase shift. The phase shift coefficient at this time is used as the target phase shift coefficient.

[0089] T14. Repeat steps T12 and T13 above, and take the kth channel as the phase reference signal in turn. Adjust the phase shift coefficient of the k+1th channel so that the phase of the sinusoidal signal output by the k+1th channel is consistent with that of the kth channel, until k=n-1, that is, the calibration of the nth channel is completed.

[0090] It is worth noting that when calibrating the phase shift coefficient, if the calibration antenna array element is fixedly used as the phase reference antenna array element, because the distance between the calibration antenna array element and different antenna array elements to be phase corrected is different, a new phase difference may be introduced due to the difference in line routing length. In order to avoid the above problem, in an embodiment of the present invention, the accuracy of the phase correction is further improved by sequentially using the previous antenna array element as the phase reference antenna array element.

[0091] Furthermore, the working principle of the phase correction module is explained by taking the phase correction of the second channel as an example. When the calibration signal source generates a sinusoidal signal with a frequency of f, the signal passes through antenna element 1 and antenna element 2 of the array antenna and reaches input channel 1 and input channel 2 of the phase correction module respectively. Due to the phase error of the array antenna, with input channel 1 as the zero-phase reference signal, the signal from input channel 1 to the mixer can be expressed as:

[0092] p1=cos(ft) (1)

[0093] Where p1 represents the signal arriving at the mixer from input channel 1; f represents the frequency of the calibration signal; t represents time; and cos() represents the cosine function.

[0094] The signal arriving at the mixer from input channel 2 can be expressed as:

[0095] p2=cos(ft+θ2+Δφ1) (2)

[0096] Where p2 is the signal arriving at the mixer from input channel 2; θ2 is the phase offset between input channel 2 and input channel 1; Δφ1 is the phase shift coefficient of the first phase shifter; f is the frequency of the calibration signal; t is time; and cos() is the cosine function.

[0097] Furthermore, after the above two signals are mixed, the resulting signal is as follows:

[0098]

[0099] Among them, p 12 represents the signal obtained by mixing p1 and p2; p1 represents the signal reaching the mixer from input channel 1; p2 represents the signal reaching the mixer from input channel 2; θ2 represents the phase offset between input channel 2 and input channel 1; Δφ1 represents the phase shift coefficient of the first phase shifter; f represents the frequency of the calibration signal; t represents time; and cos() represents the cosine function.

[0100] p 12 After low-pass filtering, only the DC term remains, which can be expressed as:

[0101]

[0102] Wherein, d1 represents the first DC signal corresponding to the first phase shifter (ie Figure 5 1); θ2 represents the phase offset between input channel 2 and input channel 1; Δφ1 represents the phase shift coefficient of the first phase shifter; and cos() represents the cosine function.

[0103] As can be seen from formula (4), when Δφ1 = -θ2, d1 can reach its maximum value of 0.5. Therefore, the control unit adjusts Δφ1 to maximize d1. At this time, the phase shifter just offsets the phase error introduced by the array antenna, completing the phase correction.

[0104] Similarly, using the calibrated signal of input channel 2 as a reference, adjust the phase shifter on input channel 3 to maximize DC signal 2, completing the calibration of the phase shift coefficient of channel 3 until the calibration of input channel n is completed, that is, the calibration of the phase shift coefficient is completed.

[0105] As an optional implementation manner, each of the target amplitude coefficients is determined in advance by:

[0106] Performing amplitude correction on the calibration signal to be amplitude corrected of the antenna array element to be amplitude corrected using the amplitude coefficient to obtain an amplitude correction signal;

[0107] performing envelope detection and low-pass filtering on the amplitude-corrected signal to obtain a second DC signal;

[0108] Performing envelope detection and low-pass filtering on the amplitude reference signal to obtain a reference DC signal; wherein the amplitude reference signal is a calibration signal to be amplitude-corrected for a calibration antenna array element or an antenna array element that has previously completed amplitude correction;

[0109] With the goal of making the second DC signal equal to the reference DC signal, the amplitude coefficient is adjusted to obtain a target amplitude coefficient.

[0110] See also Figure 6 , is a schematic diagram of an amplitude correction module provided in one embodiment of the present invention. As can be seen from the figure, the amplitude correction module has n variable gain amplifiers, n envelope detectors, n low-pass filters and 1 control unit built in. The amplification factor of the variable gain amplifier is controlled by the control unit, wherein the amplification factor is the amplitude coefficient of the embodiment of the present invention.

[0111] Further, see Figure 6 The signal to be calibrated is the signal that is input into the amplitude calibration module through input channels 1 to n. Figure 3 Taking the illustrated embodiment as an example, the calibration signal to be amplitude-corrected can be understood as a calibration signal after phase correction.

[0112] For example, a certain antenna array element can be used as a calibration antenna array element, and the calibration antenna array element can be used as the amplitude reference antenna array element for other antenna array elements (antenna array elements to be amplitude corrected); further, according to the correction order, the antenna array element that completes the amplification factor adjustment first can be used as the amplitude reference antenna array element for the subsequent antenna array elements to be amplitude corrected, which is not limited here.

[0113] Specifically, the calibration signal to be amplitude corrected will output a second DC signal after passing through a variable gain amplifier, an envelope detector and a low-pass filter, namely Figure 6 For DC signals 1-n in the signal path, the control unit uses the amplitude reference antenna element as a reference and adjusts the gain of the variable gain amplifiers in the other branches to ensure that the second DC signals in the other branches are equal to that in the branch containing the amplitude reference antenna element, thereby completing the amplitude coefficient calibration. It is worth noting that, unlike phase calibration, amplitude is insensitive to line length. Therefore, when performing amplitude coefficient calibration, the same amplitude reference antenna element can be used for different antenna elements to be amplitude-calibrated.

[0114] Furthermore, the following takes the amplitude correction of input channel 2 as an example to illustrate the working principle of the amplitude correction module in the embodiment of the present invention. c When the sinusoidal signal is input, taking input channel 1 as the reference, the signals of input channel 1 and input channel 2 can be expressed as shown in formula (5) and formula (6) respectively:

[0115] a1=cos (ft) (5)

[0116] a2=A2B2cos(ft) (6)

[0117] In equations (5) and (6), a1 represents the signal reaching the amplitude correction module from input channel 1; a2 represents the signal reaching the amplitude correction module from input channel 2; A2 represents the amplitude error introduced by the array antenna; B2 represents the amplification factor of the variable gain amplifier; f represents the frequency of the calibration signal; t represents time; and cos() represents the cosine function.

[0118] Furthermore, after the above signal enters the envelope detector, the output signals of the first envelope detector (the envelope detector of input channel 1) and the second envelope detector (the envelope detector of input channel 2) can be expressed as shown in equations (7) and (8), respectively:

[0119]

[0120] In formula (7) and formula (8), a 11 represents the output signal of the first envelope detector; a 22 represents the output signal of the second envelope detector; a1 represents the signal reaching the amplitude correction module from input channel 1; a2 represents the signal reaching the amplitude correction module from input channel 2; A2 represents the amplitude error introduced by the array antenna; B2 represents the amplification factor of the variable gain amplifier; f represents the frequency of the calibration signal; t represents time; and cos() represents the cosine function.

[0121] After low-pass filtering, only the DC term is retained, which can be expressed as and The control unit adjusts the variable gain amplifier of input channel 2 so that B2 is This makes the amplitude of input channel 2 consistent with that of input channel 1. Similarly, the control unit adjusts the variable gain amplifiers of other input channels to calibrate the amplitudes of other channels to be consistent with that of channel 1, thus completing the calibration of the amplitude coefficient.

[0122] It is worth noting that the aforementioned phase correction and amplitude correction processing are performed for single-frequency signals, but the signal transmitted when the array antenna is working has a certain bandwidth. The array antenna may introduce different amplitude and phase errors between channels at different frequencies. Therefore, amplitude and phase compensation are also required. These compensation processes are performed by the phase compensation module and the amplitude compensation module in the digital domain after sampling the baseband signal.

[0123] As an optional implementation, in step S3, an amplitude compensation matrix is ​​used to perform amplitude compensation on the amplitude-phase corrected signal. The amplitude compensation matrix is ​​pre-determined in the following manner:

[0124] generating a signal to be amplitude compensated according to the calibration signal received by the antenna array element;

[0125] generating an array digital signal matrix according to the signal to be amplitude compensated;

[0126] Performing a Hilbert transform on the distance direction of the array digital signal matrix to obtain a complex analytical matrix;

[0127] Performing a modulo operation on each element of the complex analytic matrix to obtain an amplitude matrix;

[0128] The inverse of each element of the amplitude matrix is ​​taken to obtain an amplitude compensation matrix.

[0129] It is worth noting that the signal to be amplitude compensated refers to the signal input into the amplitude compensation module when calibrating the amplitude compensation factor.

[0130] For example, let the calibration signal source generate a center frequency of f c , a monotonically increasing linear frequency sweep signal with a linear modulation frequency of K and a pulse width of T, as shown in the following formula: t (t) can be expressed as:

[0131] s t (t)=cos(π(Kt 2 +2f c t)) 0≤t≤T (9)

[0132] Among them, s t (t) represents the frequency sweep signal; f c represents the center frequency; K represents the linear modulation frequency; T represents the pulse width; π represents the pi ratio; t represents time; cos() represents the cosine function.

[0133] Assuming that the delay of the signal reaching each channel of the array antenna is equal, the signal s received by the kth channel of the array antenna is rk It can be expressed as:

[0134]

[0135] Among them, s rk (t) represents the signal received by the kth channel of the array antenna; A rk (t) represents the amplitude error of the kth channel; represents the phase error of the kth channel; f crepresents the center frequency; K represents the linear modulation frequency; π represents the pi ratio; t represents time; cos() represents the cosine function; n represents the number of channels of the array antenna, that is, the total number of antenna elements.

[0136] Furthermore, the calibration signal source is t (t) is transmitted to the down-converter as the local oscillator signal after a certain delay and can be expressed as:

[0137] s o (t,τ)=cos.π(K(t-τ) 2 +2f c (t-τ)) / (11)

[0138] Among them, s o (t,τ) represents the frequency sweep signal s t (t) is the delayed signal; τ represents the delay time; f c represents the center frequency; K represents the linear modulation frequency; π represents the circumference of a circle; t represents time; and cos() represents the cosine function.

[0139] Furthermore, the down converter is rk (t) Baseband signal s obtained after down-conversion ifk It can be expressed as:

[0140]

[0141] Among them, s ifk (τ,t) represents the baseband signal; s rk (t) represents the signal received by the kth channel of the array antenna; s o (t,τ) represents the frequency sweep signal s t (t) delayed signal; A rk (t) represents the amplitude error of the kth channel; represents the phase error of the kth channel; f c represents the center frequency; K represents the linear modulation frequency; π represents the pi ratio; t represents time; cos() represents the cosine function; τ represents the delay time.

[0142] Understandably, s ifk It can be understood as the signal to be amplitude compensated in the embodiment of the present invention.

[0143] Furthermore, the amplitude and phase compensation module is used to compensate for s ifk After low-pass filtering, ADC sampling is performed on (τ, t). The signal s of the kth channel after sampling is dk It can be expressed in matrix form:

[0144]

[0145] Among them, s dτ [k,m] represents the array digital signal matrix; A r [k,m] represents the amplitude error factor of the mth range gate of the kth channel; N represents the phase error factor of the mth range gate of the kth channel; r Indicates the number of distance points; N a Indicates the number of azimuth points, that is, the number of channels of the array antenna; n indicates the number of channels of the array antenna; f c represents the center frequency; K represents the linear modulation frequency; π represents the pi; cos() represents the cosine function; τ represents the delay time.

[0146] Furthermore, dτ As a real signal, discrete Hilbert transform along the m direction (i.e., distance direction) can be obtained to obtain s dτ The imaginary part s dτ Adding it to its imaginary part, we can get s dτ The complex analytic signal z dτ :

[0147]

[0148] Among them, z dτ [k,m] represents a complex analytic matrix; s dτ represents the real part; represents the imaginary part; j represents the imaginary unit; A r [k,m] represents the amplitude error factor of the mth range gate of the kth channel; represents the phase error factor of the mth range gate of the kth channel; f c represents the center frequency; K represents the linear modulation frequency; π represents the pi ratio; τ represents the delay time; exp[] represents the exponential function.

[0149] Furthermore, for z dτ Doing the modulo operation, we can get Construct compensation factor (amplitude compensation matrix) And let B r [k,m] and z dτ By multiplying, amplitude compensation can be completed.

[0150] As an optional implementation manner, the target phase compensation factor combination is pre-determined in the following manner:

[0151] generating a matrix to be phase compensated according to the calibration signal received by the antenna array element;

[0152] With the goal of minimizing image entropy, multiple rounds of iterations are performed on the phase compensation factor combination to obtain the target phase compensation factor combination; wherein, in each round of iteration:

[0153] Performing phase compensation on the matrix to be phase compensated by using a combination of phase compensation factors to obtain a matrix to be imaged;

[0154] generating a phase-compensated image according to the matrix to be imaged;

[0155] calculating the image entropy of the phase-compensated image;

[0156] The phase compensation factor combination is updated, and the step of calculating the matrix to be imaged is returned to iterate until the minimum image entropy is obtained.

[0157] It is worth noting that the phase compensation signal refers to the signal input to the phase compensation module when calibrating the target phase compensation factor combination. Figure 4 For example, the signal to be phase compensated is a signal after amplitude compensation using the calibrated amplitude compensation factor, and the matrix to be phase compensated is a corresponding matrix. In some implementations, the matrix to be phase compensated may also be simplified for ease of calculation.

[0158] For example, the fixed amplitude term is ignored z dτ Signal z after amplitude compensation d1τ It can be expressed as:

[0159]

[0160] Among them, z d1τ [k,m] represents the signal after amplitude compensation; j represents the imaginary unit; represents the phase error factor of the mth range gate of the kth channel; f c represents the center frequency; K represents the linear modulation frequency; π represents the pi ratio; τ represents the delay time; exp[] represents the exponential function.

[0161] For example, in order to reduce the amount of calculation, the phase compensation part converts the phase error term Assuming that it does not change with m, it can be simplified to:

[0162]

[0163] Among them, z d2τ [k,m] represents the phase compensation matrix; j represents the imaginary unit; represents the phase error of the kth channel; f c represents the center frequency; K represents the linear modulation frequency; π represents the pi ratio; τ represents the delay time; exp[] represents the exponential function.

[0164] It is worth noting that since multiple iterations are required to solve the target phase compensation factor, and imaging operations are required in each round of iteration, in order to reduce performance overhead, the matrix used for phase compensation calculation can be simplified. For example, the phase compensation intermediate matrix can be calculated, and then in each round of iteration, the phase compensation factor combination is used to perform phase compensation on the phase compensation intermediate matrix to reduce the amount of calculation.

[0165] As an optional implementation manner, before performing multiple rounds of iterations on the phase compensation factor combination, the method further includes calculating a phase compensation intermediate matrix for multiple rounds of iterations on the phase compensation factor combination in the following manner:

[0166] generating a pre-phase fine correction matrix according to the matrix to be phase compensated;

[0167] generating a reference image according to the pre-phase fine correction matrix;

[0168] identifying a target range gate based on bright spots in the reference image;

[0169] The pre-phase fine correction matrix is ​​intercepted according to the target range gate to obtain a phase compensation intermediate matrix.

[0170] It can be understood that when phase compensation is performed, based on the phase compensation factor θ k z d2τ Do phase compensation to get z d3τ :

[0171]

[0172] Among them, z d3τ [k,m] represents the pre-phase fine correction matrix; z d2τ [k,m] represents the phase compensation matrix; j represents the imaginary unit; represents the phase error of the kth channel; f c represents the center frequency; K represents the linear modulation frequency; π represents the circumference of the circle; τ represents the delay time; exp() represents the exponential function; θ k Indicates the phase compensation factor of the kth channel.

[0173] Furthermore, for z d3τ Imaging, that is, d3τ Perform a two-dimensional FFT (Fast Fourier Transform) operation and take the modulus, z d3τ The phase term that changes with m is only 2πKτ, so after performing this operation, a bright spot will be formed at a certain range gate.

[0174] It is worth noting that when calibrating the phase compensation factor, the calibration signal source transmits a swept frequency signal and a delayed swept frequency signal. Due to the time difference between the two signals, a bright spot will be formed on a certain range gate during imaging (such as the bright spot on the reference image described in the embodiment of the present invention). In addition, due to the phase error between the channels, that is, Therefore, the energy of the bright spot will leak in both directions of the azimuth, forming energy divergence and increasing the image entropy. Therefore, the present invention minimizes the image entropy to obtain the target phase compensation factor combination, thereby achieving accurate phase compensation.

[0175] Furthermore, in order to reduce performance overhead, d3τ The interception is performed, the azimuth length remains unchanged, and several range gates on both sides of the bright spot are retained in the range to obtain the phase compensation intermediate matrix.

[0176] Furthermore, d3τ The dynamic range of the imaged data is too large, which is not conducive to the calculation of image entropy. Therefore, it is necessary to convert it into a logarithmic image F. dτ [k,m], that is:

[0177] F dτ [k,m]=10*log 10 (|FFT2{z d3τ [k,m]}|)(17)

[0178] Among them, F dτ [k,m] represents a logarithmic image; log represents a logarithmic function; FFT2 represents a two-dimensional fast Fourier transform; z d3τ [k,m] represents the pre-phase fine correction matrix; || represents the modulo operation on the complex number.

[0179] For example, F dτ [k,m] is used as a threshold to reduce the impact of low noise on image entropy and obtain F d2τ [k,m]:

[0180]

[0181] Among them, F d2τ [k,m] represents the logarithmic image after thresholding; F dτ [k,m] represents the logarithmic image; th represents the threshold; else represents other cases.

[0182] Furthermore, for F d2τ [k,m] performs normalization operation to obtain F d3τ [k,m]:

[0183]

[0184] Among them, Fd3τ [k,m] represents the normalized logarithmic image; max{} represents the maximum value in the matrix; min{} represents the minimum value in the matrix; F d2τ [k,m] represents the logarithmic image after thresholding.

[0185] Furthermore, the frequency histogram method is used to obtain the image entropy and calculate F d3τ The frequency histogram of [k,m] is H[k], H[k] represents F d3τ The number of element values ​​in [k,m] that fall within the kth numerical group. The number of numerical groups can be selected according to actual conditions.

[0186] Assuming that the number of image groups is g, the image entropy E is:

[0187]

[0188] Where E represents the image entropy; g represents the number of image groups; H[k] represents F d3τ The number of element values ​​in [k,m] that fall within the kth numerical group; N r Indicates the number of distance points; N a represents the number of azimuth points; log represents the logarithmic function.

[0189] Compared to the prior art, the array antenna amplitude and phase error correction method described in an embodiment of the present invention employs a method in which each antenna element receives the same input signal; performs amplitude and phase correction on the received input signal; performs amplitude compensation on the amplitude and phase corrected signal; and employs a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging, thereby performing phase compensation and obtaining an output signal. This embodiment of the present invention performs amplitude and phase correction and amplitude and phase compensation on the input signal received by the array antenna. Furthermore, during phase compensation, by introducing a target phase compensation factor combination to minimize image entropy, it is possible to accurately correct amplitude and phase errors between array channels, avoid azimuthal energy leakage of strong target points after imaging, and achieve higher imaging quality and deformation monitoring accuracy.

[0190] For example, in some embodiments, only phase correction may be performed, for example, see Figure 7 , is a schematic diagram of phase error correction for an array antenna according to an embodiment of the present invention. The phase correction module performs phase correction on the input signal received by the array antenna to obtain a phase-corrected signal. The downconverter generates a baseband signal based on the phase-corrected signal and the local oscillator signal. Finally, the phase compensation module performs phase compensation on the baseband signal to obtain an output signal. It is worth noting that the functions, operating principles, and technical effects of each module in this embodiment of the present invention are the same as those in the corresponding embodiment described above. The calibration methods for the parameters of each module are also the same as those in the corresponding embodiment described above and are not further elaborated here.

[0191] For example, in some embodiments, only amplitude correction may be performed, for example, see Figure 8 , is a schematic diagram of an array antenna amplitude error correction system according to one embodiment of the present invention. The amplitude correction module performs amplitude correction on the input signal received by the array antenna to obtain an amplitude-corrected signal. The downconverter generates a baseband signal based on the amplitude-corrected signal and the local oscillator signal. Finally, the amplitude compensation module performs amplitude compensation on the baseband signal to obtain an output signal. It is worth noting that the functions, operating principles, and technical effects of each module in this embodiment of the present invention are the same as those in the corresponding embodiment. The calibration methods for the parameters of each module are also the same as those in the corresponding embodiment and are not further described here.

[0192] To achieve the above objectives, an embodiment of the present invention further provides an array antenna amplitude and phase error correction device, comprising:

[0193] An array antenna is used to receive the same input signal using each antenna element;

[0194] an amplitude and phase correction module, configured to perform amplitude and phase correction on the received input signal;

[0195] An amplitude compensation module is used to perform amplitude compensation on the signal after amplitude and phase correction;

[0196] The phase compensation module is used to use a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging to perform phase compensation and obtain an output signal.

[0197] The array antenna amplitude and phase error correction device provided in an embodiment of the present invention can implement all the process steps of the array antenna amplitude and phase error correction method described in the above embodiment. The functions and technical effects achieved by each module and unit in the device are respectively the same as the functions and technical effects achieved by the array antenna amplitude and phase error correction method described in the above embodiment. The specific implementation method will not be repeated here.

[0198] See also Figure 9 The embodiment of the present invention further provides an array antenna amplitude and phase error correction device 20, comprising a processor 21, a memory 22, and a computer program stored in the memory 22 and configured to be executed by the processor 21. When the processor 21 executes the computer program, the steps in the embodiment of the array antenna amplitude and phase error correction method are implemented, for example Figure 1 or, the processor 21 implements the functions of the modules in the above-mentioned device embodiments when executing the computer program.

[0199] The array antenna amplitude and phase error correction device can be a computing device such as a desktop computer, laptop, PDA, or cloud server. The array antenna amplitude and phase error correction device may include, but is not limited to, a processor and memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of an array antenna amplitude and phase error correction device and does not limit the scope of the device. The device may include more or fewer components than shown, or a combination of certain components, or different components. For example, the array antenna amplitude and phase error correction device may also include input and output devices, network access devices, buses, and the like.

[0200] The processor may be a central processing unit (CPU), or other general-purpose processors, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor serves as the control center of the array antenna amplitude and phase error correction device, and utilizes various interfaces and lines to connect various parts of the entire array antenna amplitude and phase error correction device.

[0201] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the array antenna amplitude and phase error correction device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created based on the use of the controller, etc. In addition, the memory can include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0202] Wherein, if the module integrated in the array antenna amplitude and phase error correction device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0203] Compared to the prior art, the array antenna amplitude and phase error correction device, apparatus, and storage medium described in the embodiments of the present invention employ a method in which each antenna element receives the same input signal; performs amplitude and phase correction on the received input signal; performs amplitude compensation on the amplitude and phase corrected signal; and employs a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging to perform phase compensation and obtain an output signal. The embodiments of the present invention perform amplitude and phase correction and amplitude and phase compensation on the input signal received by the array antenna. Furthermore, during phase compensation, by introducing a target phase compensation factor combination to minimize image entropy, they can achieve precise correction of amplitude and phase errors between array channels, avoid azimuthal energy leakage of strong target points after imaging, and achieve higher imaging quality and deformation monitoring accuracy.

[0204] The above is 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 principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for correcting amplitude and phase errors of an array antenna, characterized in that: include: Using each antenna array element to receive the same input signal; performing amplitude and phase correction on the received input signal; Perform amplitude compensation on the signal after amplitude and phase correction; The target phase compensation factor combination is used to minimize the image entropy of the amplitude compensated signal after imaging to perform phase compensation and obtain the output signal.

2. The array antenna amplitude and phase error correction method according to claim 1, wherein: The target phase compensation factor combination is determined in advance by: generating a matrix to be phase compensated according to the calibration signal received by the antenna array element; With the goal of minimizing image entropy, multiple rounds of iterations are performed on the phase compensation factor combination to obtain the target phase compensation factor combination; wherein, in each round of iteration: Performing phase compensation on the matrix to be phase compensated by using a combination of phase compensation factors to obtain a matrix to be imaged; generating a phase-compensated image according to the matrix to be imaged; calculating the image entropy of the phase-compensated image; The phase compensation factor combination is updated, and the step of calculating the matrix to be imaged is returned to iterate until the minimum image entropy is obtained.

3. The array antenna amplitude and phase error correction method according to claim 2, wherein: Before performing multiple rounds of iterations on the phase compensation factor combination, the method further includes calculating a phase compensation intermediate matrix for multiple rounds of iterations on the phase compensation factor combination in the following manner: generating a pre-phase fine correction matrix according to the matrix to be phase compensated; generating a reference image according to the pre-phase fine correction matrix; identifying a target range gate based on bright spots in the reference image; The pre-phase fine correction matrix is ​​intercepted according to the target range gate to obtain a phase compensation intermediate matrix.

4. The array antenna amplitude and phase error correction method according to claim 1, wherein: The amplitude compensation matrix is ​​used to perform amplitude compensation on the signal after amplitude and phase correction. The amplitude compensation matrix is ​​determined in advance by the following method: generating a signal to be amplitude compensated according to the calibration signal received by the antenna array element; generating an array digital signal matrix according to the signal to be amplitude compensated; Performing a Hilbert transform on the distance direction of the array digital signal matrix to obtain a complex analytical matrix; Performing a modulo operation on each element of the complex analytic matrix to obtain an amplitude matrix; The inverse of each element of the amplitude matrix is ​​taken to obtain an amplitude compensation matrix.

5. The array antenna amplitude and phase error correction method according to claim 1, wherein: The performing amplitude and phase correction on the received input signal includes: Performing phase shift processing on the input signal according to a target phase shift coefficient to obtain a phase-corrected signal; Amplitude correction is performed on the phase-corrected signal according to a target amplitude coefficient to obtain an amplitude- and phase-corrected signal.

6. The array antenna amplitude and phase error correction method according to claim 5, wherein: Each of the target phase shift coefficients is determined in advance by: The phase shift coefficient is used to perform phase shift processing on the calibration signal received by the antenna array element to be phase corrected to obtain a phase-shifted signal; The phase-shifted signal and the phase reference signal are mixed and low-pass filtered to obtain a first DC signal; wherein the phase reference signal is a calibration signal received by a calibration antenna array element or an antenna array element that has previously completed phase correction; With the goal of maximizing the first DC signal, the phase shift coefficient is adjusted to obtain a target phase shift coefficient.

7. The array antenna amplitude and phase error correction method according to claim 5, wherein: Each of the target amplitude coefficients is determined in advance by: Performing amplitude correction on the calibration signal to be amplitude corrected of the antenna array element to be amplitude corrected using the amplitude coefficient to obtain an amplitude correction signal; performing envelope detection and low-pass filtering on the amplitude-corrected signal to obtain a second DC signal; Performing envelope detection and low-pass filtering on the amplitude reference signal to obtain a reference DC signal; wherein the amplitude reference signal is a calibration signal to be amplitude-corrected for a calibration antenna array element or an antenna array element that has previously completed amplitude correction; With the goal of making the second DC signal equal to the reference DC signal, the amplitude coefficient is adjusted to obtain a target amplitude coefficient.

8. An array antenna amplitude and phase error correction device, characterized in that: include: An array antenna is used to receive the same input signal using each antenna element; an amplitude and phase correction module, configured to perform amplitude and phase correction on the received input signal; An amplitude compensation module is used to perform amplitude compensation on the signal after amplitude and phase correction; The phase compensation module is used to use a target phase compensation factor combination to minimize the image entropy of the amplitude-compensated signal after imaging to perform phase compensation and obtain an output signal.

9. An array antenna amplitude and phase error correction device, characterized in that: The invention comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the array antenna amplitude and phase error correction method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the array antenna amplitude and phase error correction method according to any one of claims 1 to 7.

Images