Method for controlling amplitude and phase distortion introduced by a receiving channel of a high-precision anti-jamming navigation

Abstract

The application provides a control method for amplitude-phase distortion introduced by a high-precision anti-interference navigation receiving channel, and belongs to the field of high-precision anti-interference satellite navigation. The method comprises a three-stage cooperative mechanism of design-measurement-correction. In the design stage, four-point feed, choke coil and maximum allowable deviation are adopted to limit antenna array element error sources, and error distribution and component selection are adopted to limit radio frequency channel error sources. In the research and development stage, the radio frequency channel amplitude-phase-frequency response and the array element amplitude-phase-incidence angle response database are measured and established, and the first and second amplitude-phase correction parameters are generated. In the application stage, based on the signal frequency and the satellite signal incident direction, the signal is compensated by the channel amplitude-phase correction unit and the array element amplitude-phase correction unit in turn to ensure that the anti-interference and navigation signal information processing is normal. Through large-step measurement and interpolation, the application achieves a compromise between precision, efficiency and storage, and is suitable for high-precision positioning and orientation applications in high-dynamic and strong-interference environments.

Description

Technical Field

[0001] This invention relates to the field of high-precision anti-jamming satellite navigation technology, and in particular to a method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-jamming navigation. Background Technology

[0002] High-precision anti-jamming satellite navigation applications, such as precision approach and landing of aircraft, carrier-based aircraft landing, formation flying and automatic aerial refueling of aircraft, and rapid orientation finding and autonomous north-seeking of missile launchers / aircraft, face prominent challenges due to complex interference environments and high positioning and orientation requirements.

[0003] The complexity of the interference environment is mainly reflected in the diversity and frequent changes of interference types. From the perspective of interference mechanisms, interference can be divided into suppression interference, deception interference, and a combination of suppression and deception interference. Deception interference can be further subdivided into regenerative and repeater types. Changes in interference are reflected in the rapid or slow variations over time in parameters such as its number, direction of attack, modulation method, frequency, and intensity. High-precision positioning and orientation requirements are reflected in providing positioning services at the decimeter or even centimeter level under real-time or near-real-time conditions, as well as orientation services better than 1° or 0.5°.

[0004] To achieve high-precision positioning and orientation in complex interference environments, three strongly coupled technical challenges must be addressed: detection and real-time suppression of complex interference, source tracing and control of satellite signal distortion, and high-precision positioning and orientation under low-distortion conditions.

[0005] One of the key challenges in tracing and controlling satellite signal distortion is controlling the distortion introduced by non-ideal amplitude and phase characteristics in the receiving channel. Existing technologies for controlling distortion introduced by non-ideal amplitude and phase characteristics in the receiving channel mainly fall into two categories. The first category is error source correction methods, which are based on estimating the error source and then correcting it. Examples include array element pattern error correction, array element position error correction, array element mutual coupling effect correction, and channel amplitude and phase error correction. These methods typically require assuming small perturbations in the error source and using a small number of precisely known auxiliary sources to estimate specific error sources, or relying on multiple auxiliary sources and multiple auxiliary array elements with precisely corrected amplitude and phase characteristics to estimate the combined amplitude and phase error. However, in practical applications, multiple error sources (array element pattern, position, mutual coupling, and channel amplitude and phase) often coexist, and their models do not satisfy the small perturbation assumption. Furthermore, the process of accurately correcting auxiliary array elements is time-consuming and costly, and its correction accuracy is also affected by the mutual interference between the array elements to be estimated, which reduces its accuracy.

[0006] The second type of method is the error correction method, which focuses on post-compensation of the response of channels or array elements, such as amplitude / phase-frequency response correction for each channel, or amplitude / phase-incident angle response correction for each array element and channel. However, the former only corrects the distortion introduced by non-ideals in the RF channel and fails to address the distortion introduced by non-ideals in the antenna array elements; the latter, while able to handle distortion introduced by the array elements, performs its correction only after the anti-interference processing stage. This results in the amplitude and phase errors of each channel still existing in the critical anti-interference processing stage, which degrades the performance of anti-interference processing and, in extreme cases, may even lead to the failure of the anti-interference function.

[0007] In summary, neither of the existing amplitude and phase distortion control methods can meet the stringent requirements of high-precision anti-interference navigation applications for controlling the amplitude and phase distortion of satellite signals. Summary of the Invention

[0008] The purpose of this invention is to provide a method for controlling amplitude and phase distortion introduced by the receiving channel in high-precision anti-interference navigation. Through a closed-loop "design-measurement-correction" process, the system eliminates amplitude and phase errors of the array antenna and radio frequency channel, blocks the propagation of amplitude and phase errors of the receiving channel to subsequent anti-interference and navigation signal information processing stages (including: acquisition and tracking, observation extraction, PVT, etc.), achieves high-fidelity reception of satellite signals under strong interference, and ensures high-precision navigation and positioning.

[0009] To achieve the above objectives, the present invention provides a method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation, comprising the following steps:

[0010] Step S1: During the R&D phase, the amplitude-phase-frequency response of each RF channel is measured offline to obtain the amplitude-phase-frequency response data of each RF channel. Based on the amplitude-phase-frequency response data, the amplitude-phase mismatch data of each RF channel relative to the reference RF channel is calculated and stored as the first amplitude-phase correction parameter.

[0011] Step S2: During the research and development phase, the amplitude-phase-incident angle response of each element in the array antenna is measured offline to obtain the amplitude-phase-incident angle response data of each element. Based on the amplitude-phase-incident angle response data, the amplitude-phase mismatch data of each element relative to the reference element is calculated and stored as the second amplitude-phase correction parameter.

[0012] Step S3: In the application phase, receive the combined signal containing satellite signals, noise and interference, and perform amplitude and phase distortion correction on the combined signal of each radio frequency channel according to the first amplitude and phase correction parameters stored in step S1 based on the signal frequency index.

[0013] Step S4: Perform anti-interference processing on the signal corrected in step S3;

[0014] Step S5: Based on the incident direction of the satellite signal, index the second phase correction parameters stored in step S2, and perform array element phase distortion correction on the signal after anti-interference processing.

[0015] Step S6: Capture, track, and perform PVT calculation on the signal corrected in step S5, and output the positioning and orientation results.

[0016] Preferably, step S1 specifically includes:

[0017] A frequency sweep signal with continuously varying frequency within the satellite navigation signal bandwidth was used as the test signal, and it was divided into two parts by a power divider. Enter the following paths respectively One radio frequency channel;

[0018] Perform output signal processing on each RF channel Point fast Fourier transform is used to obtain the amplitude and phase response data of each RF channel at each frequency point, i.e. amplitude-phase-frequency response measurement data.

[0019] Using the first RF channel as the reference RF channel, calculate the amplitude and phase mismatch data of each of the other RF channels relative to the reference RF channel at each frequency point, which is the first amplitude and phase correction parameter.

[0020] Preferably, the formula for calculating the first phase correction parameter is as follows:

[0021] ;

[0022] The formula for calculating the first amplitude correction parameter is as follows:

[0023] ;

[0024] The formula for calculating the first phase correction parameter is as follows:

[0025] ;

[0026] in, Indicates the first The radio frequency channel, the first Amplitude and phase correction parameters at each frequency Indicates the first radio frequency channel, the... Amplitude and phase measurement data at each frequency, Indicates the first The radio frequency channel, the first Amplitude and phase measurement data at each frequency, Indicates the first The radio frequency channel, the first Amplitude correction parameters at each frequency Indicates the first The radio frequency channel, the first Phase correction parameters at each frequency, , These represent modulo and auxiliary angle operations, respectively. e represents the natural constant, and i represents the imaginary unit.

[0027] Preferably, step S2 specifically includes:

[0028] Using an ideal broadband signal within the satellite navigation signal bandwidth as the test signal, the test signal is controlled to traverse the spatial incident direction at preset azimuth and elevation step sizes.

[0029] The amplitude and phase response of each array element in each incident direction is measured to obtain amplitude and phase-incident angle response measurement data;

[0030] Using the first array element as the reference array element, calculate the amplitude ratio and phase difference of each of the remaining array elements relative to the reference array element in each incident direction to obtain the initial amplitude-phase mismatch data;

[0031] The initial amplitude-phase mismatch data is interpolated to obtain the second amplitude-phase correction parameters.

[0032] Preferably, the azimuth step size is 6°, the elevation step size is 2°, and the interpolated spatial grid interval is 2°×2°.

[0033] Preferably, the formula for calculating the second phase correction parameter is as follows:

[0034] ;

[0035] The formula for calculating the second amplitude correction parameter is as follows:

[0036] ;

[0037] The formula for calculating the second phase correction parameter is as follows:

[0038] ;

[0039] in, Indicates the first Each array element, Amplitude and phase correction parameters in the direction, Indicates the first array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude correction parameters in the direction, Indicates the first Each array element, Phase correction parameters in the direction, Indicates azimuth. Indicates the pitch angle, the first Each array element followed by the first One radio frequency channel.

[0040] Preferably, in step S3, amplitude and phase distortion correction is achieved by a channel amplitude and phase correction unit, which is located after the radio frequency channel and before the anti-interference processing unit. The channel amplitude and phase correction unit retrieves and applies the corresponding first amplitude and phase correction parameters according to the signal frequency.

[0041] Preferably, in step S5, the element amplitude and phase distortion correction is achieved by the element amplitude and phase correction unit. The element amplitude and phase correction unit is set after the anti-interference processing unit and before the acquisition and tracking observation extraction PVT solution unit. The corresponding second amplitude and phase correction parameters are retrieved and applied according to the incident direction of the satellite signal.

[0042] Preferably, in step S5, the incident direction of the satellite signal is obtained through the following steps:

[0043] Obtain the attitude information of the array antenna in the protocol geocentric coordinate system;

[0044] Obtain the positions of the satellite and array antenna phase centers in the protocol geocentric coordinate system;

[0045] By rotating the coordinate system, the observation vector pointing from the array antenna to the satellite is transformed to the array antenna coordinate system;

[0046] The azimuth and elevation angles are calculated based on the observation vectors in the array antenna coordinate system.

[0047] Preferably, a design phase is included before the research and development phase, during which:

[0048] Four-point feeding, choke coil, and maximum permissible deviation are used to limit the error sources of the antenna array elements, while error distribution and component selection are used to limit the error sources of the radio frequency channel.

[0049] Therefore, the present invention employs the above-mentioned method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation, and the beneficial technical effects are as follows:

[0050] (1) By limiting error sources in the design phase, measuring errors in the R&D phase, and correcting errors in the application phase, comprehensive measures are taken to solve the problem of non-ideal amplitude and phase of the receiving channel, and the amplitude and phase distortion introduced by the receiving channel is systematically controlled.

[0051] (2) Add a channel amplitude and phase correction unit between the radio frequency channel and the anti-interference processing unit to block the propagation of the radio frequency channel amplitude and phase error source to the anti-interference processing unit, and ensure that the anti-interference processing and subsequent units are not affected by the radio frequency channel amplitude and phase error.

[0052] (3) An array element amplitude and phase correction unit is added between the anti-interference processing unit and the acquisition and tracking observation extraction PVT solution unit to compensate for the amplitude and phase distortion introduced by the amplitude and phase error of each array element to the satellite signal, so as to ensure that the signals of acquisition and tracking, observation extraction and high-precision PVT solution are indeed satellite signals with extremely low distortion.

[0053] (4) Measurement and correction of amplitude and phase errors of antenna array elements, taking into account correction accuracy, measurement efficiency, and storage capacity. The higher the amplitude and phase correction accuracy, the smaller the grid cell in the incident direction of the test signal and the larger the storage capacity of the correction parameters, which in turn leads to lower measurement efficiency; and vice versa. Therefore, the incident direction of the test signal is based on a larger grid cell. Traverse the entire space to obtain the amplitude-phase mismatch data of each array element at the sparser grid points; interpolate the amplitude-phase mismatch data of the sparser grid points to obtain the smaller grid element. A total of 16380 amplitude and phase correction parameters are formed on denser grid points. A spatial signal amplitude and phase correction grid with (M-1) correction parameters. Attached Figure Description

[0054] Figure 1 This is a flowchart of a method for controlling amplitude and phase distortion introduced into the receiving channel of the high-precision anti-interference navigation system of the present invention. Detailed Implementation

[0055] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0056] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0057] Example 1

[0058] like Figure 1 As shown, solid boxes identify conventional anti-interference navigation processing units based on array antennas, dashed boxes mark measurement, storage, and correction units related to the amplitude and phase errors of each array element, short-dot-dot boxes indicate measurement, storage, and correction units related to the amplitude and phase errors of each channel, and dotted boxes indicate storage and correction units related to anti-interference weighting. The storage and correction related to anti-interference weighting adopts a comprehensive approach: first, using the steering vector of the satellite signal, the total amplitude and phase distortion introduced by anti-interference weighting is calculated; then, before acquiring and tracking the satellite signal, the total amplitude and phase distortion introduced by anti-interference weighting is compensated. This is existing technology and will not be elaborated upon in this embodiment.

[0059] A method for controlling amplitude and phase distortion introduced by the receiving channel in high-precision anti-jamming navigation includes the following steps:

[0060] 1. Limit amplitude and phase error sources during the design phase.

[0061] During the design phase, multiple measures were taken to limit the amplitude and phase error sources of the array antenna and RF channel. Each element of the array antenna adopted a four-point feeding scheme with excellent structural symmetry to maintain phase center stability, broaden the operating bandwidth, and minimize element pattern errors. Within the limits of manufacturing technology, maximum permissible deviations of element position errors (i.e., maximum permissible horizontal and vertical offsets) were specified to strictly constrain manufacturing accuracy and minimize element position errors. The spacing between array antenna elements was maximized, within the constraints of the carrier half-wavelength and array antenna size, and chokes were used around the elements to minimize element mutual coupling effects. Within the limits of manufacturing capabilities, the amplitude and phase characteristic requirements of the RF channel were demonstrated and allocated, and the channel components were customized accordingly to minimize RF channel amplitude and phase errors.

[0062] 2. Measurement of amplitude and phase errors and storage of correction parameters during the R&D phase.

[0063] 1) Measure the amplitude-phase-frequency response of each RF channel offline to obtain amplitude-phase-frequency response data of each RF channel. Calculate and store the amplitude-phase mismatch data of each RF channel relative to the reference RF channel as the first amplitude-phase correction parameter based on the response data.

[0064] The test signal is a frequency sweep signal with continuously varying frequency within the satellite signal bandwidth, which is then divided by a power divider. Enter the following paths respectively One radio frequency channel, and perform processing on the output signals of the M radio frequency channels. Point Fast Fourier Transform (FFT); measures the amplitude and phase response of each RF channel at each frequency point. AP_RFC(m,n), RF channel number. Frequency serial number .

[0065] Using the first RF channel as the reference RF channel, the amplitude and phase mismatch data of each of the remaining RF channels relative to the reference RF channel at each frequency point are calculated, i.e., the first amplitude and phase correction parameters are as follows:

[0066] ;

[0067] The formula for calculating the first amplitude correction parameter is as follows:

[0068] ;

[0069] The formula for calculating the first phase correction parameter is as follows:

[0070] ;

[0071] in, Indicates the first The radio frequency channel, the first Amplitude and phase correction parameters at each frequency Indicates the first radio frequency channel, the... Amplitude and phase measurement data at each frequency, Indicates the first The radio frequency channel, the first Amplitude and phase measurement data at each frequency, This represents the amplitude correction parameter at the m-th radio frequency channel and the n-th frequency. This represents the phase correction parameter at the m-th RF channel and the n-th frequency. , These represent modulo and auxiliary angle operations, respectively. e represents the natural constant, and i represents the imaginary unit.

[0072] Arrange the amplitude and phase correction parameters according to N rows (frequency 1~N), M Store the data in a table format with one column (channels 2 to M) to Flash, see Table 1.

[0073] Table 1. Storage method of amplitude and phase correction parameters for each channel

[0074] ;

[0075] 2) Measure the amplitude-phase-incident angle response of each element in the array antenna offline, obtain the amplitude-phase-incident angle response data of each element, calculate and store the amplitude-phase mismatch data of each element relative to the reference element as the second amplitude-phase correction parameter based on the response data.

[0076] The test signal is an ideal broadband signal within the satellite signal bandwidth. The test signal is along the azimuth angle. Pitch angle Incident light is directed onto the array antenna; to balance accuracy and efficiency. Traverse the 0~360° range in 6° increments. Traverse the range from -90° to 90° in 2° increments; measure the amplitude and phase of the M signals output by the channel amplitude and phase correction unit, AP_ANT(m, , ), array element number .

[0077] Using an ideal broadband signal within the satellite navigation signal bandwidth (with a flat amplitude and consistent phase throughout the entire satellite signal bandwidth) as the test signal, the test signal is controlled to traverse the spatial incident direction at preset azimuth and elevation step sizes.

[0078] The amplitude and phase response of each array element in each incident direction is measured to obtain amplitude and phase-incident angle response measurement data;

[0079] Using the first array element as the reference array element, calculate the amplitude ratio and phase difference of each of the remaining array elements relative to the reference array element in each incident direction to obtain the initial amplitude-phase mismatch data;

[0080] The initial amplitude-phase mismatch data is interpolated to obtain the second amplitude-phase correction parameters.

[0081] The formula for calculating the second phase correction parameter is as follows:

[0082] ;

[0083] The formula for calculating the second amplitude correction parameter is as follows:

[0084] ;

[0085] The formula for calculating the second phase correction parameter is as follows:

[0086] ;

[0087] in, Indicates the first Each array element, Amplitude and phase correction parameters in the direction, Indicates the first array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude correction parameters in the direction, Indicates the first Each array element, Phase correction parameters in the direction, Indicates azimuth. Indicates the pitch angle, the first Each array element followed by the first One radio frequency channel.

[0088] In order to improve The amplitude and phase correction accuracy within the lattice is obtained by interpolation based on the above measurement data. Amplitude and phase correction parameters for grid points. The amplitude and phase correction parameters are stored in Flash in a table format with 16380 rows (azimuth 0:2:358, elevation -90:2:90) and columns (array elements 2~M), as shown in Table 2.

[0089] Table 2 Storage method of amplitude and phase correction parameters for each array element

[0090] ;

[0091] 3. Correct amplitude and phase errors during the application stage.

[0092] 1) Correct the amplitude and phase errors of each channel.

[0093] After the RF channel and before the anti-interference processing unit (which includes built-in anti-interference weight vector calculation, anti-interference weight vector determination, and time alignment and weighted summation of the anti-interference weight vector and input vector), a channel amplitude and phase correction unit is added. This unit performs online amplitude and phase correction on the combined signal transmitted by each channel in the frequency domain according to the amplitude and phase correction parameters of each channel stored in the frequency index Flash; it blocks the propagation path of the RF channel amplitude and phase error source to the anti-interference processing unit, ensuring that the anti-interference processing and subsequent units work normally and are not affected by the RF channel amplitude and phase error.

[0094] 2) Correct the amplitude and phase errors of each array element.

[0095] An array element amplitude and phase correction unit is added after the anti-interference processing unit and before the PVT solution unit for acquisition and tracking observations. This unit is based on the direction closest to the satellite signal incident direction. The azimuth and elevation angles are indexed in the Flash memory to store the amplitude and phase correction parameters of each array element. This is used to perform online amplitude and phase correction on the output signal of the anti-interference processing unit. It also compensates for the satellite signal distortion introduced by the amplitude and phase error sources of the antenna array elements, ensuring that the signal processed by the PVT solution unit for the acquisition and tracking observations is indeed a satellite signal with extremely low distortion.

[0096] The above satellite signal incident direction in the array antenna coordinate system (AACS) The calculation steps are as follows:

[0097] First, the attitude of the array antenna is obtained through attitude sensor measurement or autonomous estimation. , Indicates the roll angle. Indicates pitch angle, Indicates the rotation angle.

[0098] Then, by demodulating the navigation message or prior information, the position of the satellite and array antenna phase center P in the protocol geocentric ECEF rectangular coordinate system is obtained. and , , , These represent the coordinate components of the satellite in the x-axis, y-axis, and z-axis directions in the ECEF rectangular coordinate system, respectively. , , These represent the coordinate components of the phase center P of the array antenna in the x-axis, y-axis, and z-axis directions in the ECEF rectangular coordinate system, respectively.

[0099] Next, through two coordinate system transformations—from the ECEF Cartesian coordinate system to the station-centered coordinate system (ENU) and from ENU to AACS—the satellite's observation vector at point P is transformed. Transformed into observation vectors in AACS ,Right now:

[0100] ;

[0101] in, Let X represent the observation vector components of the satellite relative to the phase center P of the array antenna in the x-axis, y-axis, and z-axis directions in the ECEF coordinate system, respectively. These represent the observation vector components of the satellite relative to the phase center P of the array antenna in the x-axis, y-axis, and z-axis directions in the AACS coordinate system, respectively.

[0102] Coordinate system rotation transformation matrix and The expressions are as follows:

[0103] ;

[0104] ;

[0105] ;

[0106] ;

[0107] ;

[0108] in, and These are the longitude and latitude of point P in the agreed geodetic coordinate system, respectively. Latitude The formula below is obtained by iterating 3 to 4 times, with the initial value set to 0.

[0109] ;

[0110] ;

[0111] ;

[0112] Among them, constants The major radius of the Earth's reference ellipsoid is a constant. The eccentricity of the reference ellipsoid .

[0113] Finally, Substituting into the following formula, we can obtain the incident azimuth angle of the satellite signal in AACS. Pitch angle ,Right now:

[0114] ;

[0115] .

[0116] It is worth noting that all contents not described in detail in this invention are existing technologies and are well known to those skilled in the art.

[0117] Therefore, this invention adopts the amplitude and phase distortion control method introduced by the receiving channel of the high-precision anti-interference navigation mentioned above. Through the "design-measurement-correction" full-link closed loop, the system eliminates the amplitude and phase errors of the radio frequency channel and array antenna, blocks the propagation of distortion to the anti-interference and PVT links, realizes high-fidelity reception of satellite signals under strong interference, and significantly improves the stability and reliability of high-precision navigation and positioning.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation, characterized in that, Includes the following steps: Step S1: During the R&D phase, the amplitude-phase-frequency response of each RF channel is measured offline to obtain the amplitude-phase-frequency response data of each RF channel. Based on the amplitude-phase-frequency response data, the amplitude-phase mismatch data of each RF channel relative to the reference RF channel is calculated and stored as the first amplitude-phase correction parameter. Step S2: During the research and development phase, the amplitude-phase-incident angle response of each element in the array antenna is measured offline to obtain the amplitude-phase-incident angle response data of each element. Based on the amplitude-phase-incident angle response data, the amplitude-phase mismatch data of each element relative to the reference element is calculated and stored as the second amplitude-phase correction parameter. Step S3: In the application phase, receive the combined signal containing satellite signals, noise and interference, and perform amplitude and phase distortion correction on the combined signal of each radio frequency channel according to the first amplitude and phase correction parameters stored in step S1 based on the signal frequency index. Step S4: Perform anti-interference processing on the signal corrected in step S3; Step S5: Based on the incident direction of the satellite signal, index the second phase correction parameters stored in step S2, and perform array element phase distortion correction on the signal after anti-interference processing. Step S6: Capture, track, and perform PVT calculation on the signal corrected in step S5, and output the positioning and orientation results.

2. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 1, characterized in that, Step S1 specifically includes: A frequency sweep signal with continuously varying frequency within the satellite navigation signal bandwidth was used as the test signal, and it was divided into two parts by a power divider. Enter the following paths respectively One radio frequency channel; Perform output signal processing on each RF channel Point fast Fourier transform is used to obtain the amplitude and phase response data of each RF channel at each frequency point, i.e. amplitude-phase-frequency response measurement data. Using the first RF channel as the reference RF channel, calculate the amplitude and phase mismatch data of each of the other RF channels relative to the reference RF channel at each frequency point, which is the first amplitude and phase correction parameter.

3. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 2, characterized in that, The formula for calculating the first phase correction parameter is as follows: ； The formula for calculating the first amplitude correction parameter is as follows: ； The formula for calculating the first phase correction parameter is as follows: ； in, Indicates the first The radio frequency channel, the first Amplitude and phase correction parameters at each frequency Indicates the first radio frequency channel, the... Amplitude and phase measurement data at each frequency, Indicates the first The radio frequency channel, the first Amplitude and phase measurement data at each frequency, Indicates the first The radio frequency channel, the first Amplitude correction parameters at each frequency Indicates the first The radio frequency channel, the first Phase correction parameters at each frequency, , These represent modulo and auxiliary angle operations, respectively. e represents the natural constant, and i represents the imaginary unit.

4. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 1, characterized in that, Step S2 specifically includes: Using an ideal broadband signal within the satellite navigation signal bandwidth as the test signal, the test signal is controlled to traverse the spatial incident direction at preset azimuth and elevation step sizes. The amplitude and phase response of each array element in each incident direction is measured to obtain amplitude and phase-incident angle response measurement data; Using the first array element as the reference array element, calculate the amplitude ratio and phase difference of each of the remaining array elements relative to the reference array element in each incident direction to obtain the initial amplitude-phase mismatch data; The initial amplitude-phase mismatch data is interpolated to obtain the second amplitude-phase correction parameters.

5. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 4, characterized in that, The azimuth step size is 6°, the elevation step size is 2°, and the interpolated spatial grid interval is 2°×2°.

6. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 4, characterized in that, The formula for calculating the second phase correction parameter is as follows: ； The formula for calculating the second amplitude correction parameter is as follows: ； The formula for calculating the second phase correction parameter is as follows: ； in, Indicates the first Each array element, Amplitude and phase correction parameters in the direction, Indicates the first array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude and phase interpolation data in the direction, Indicates the first Each array element, Amplitude correction parameters in the direction, Indicates the first Each array element, Phase correction parameters in the direction, Indicates azimuth. Indicates the pitch angle, the first Each array element is followed by the first One radio frequency channel.

7. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 1, characterized in that, In step S3, amplitude and phase distortion correction is achieved through a channel amplitude and phase correction unit. The channel amplitude and phase correction unit is located after the radio frequency channel and before the anti-interference processing unit. It retrieves and applies the corresponding first amplitude and phase correction parameters according to the signal frequency.

8. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 1, characterized in that, In step S5, the amplitude and phase distortion correction of the array element is achieved by the array element amplitude and phase correction unit. The array element amplitude and phase correction unit is set after the anti-interference processing unit and before the acquisition and tracking observation extraction PVT solution unit. The corresponding second amplitude and phase correction parameters are retrieved and applied according to the incident direction of the satellite signal.

9. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 8, characterized in that, In step S5, the incident direction of the satellite signal is obtained through the following steps: Obtain the attitude information of the array antenna in the protocol geocentric coordinate system; Obtain the positions of the satellite and array antenna phase centers in the protocol geocentric coordinate system; By rotating the coordinate system, the observation vector pointing from the array antenna to the satellite is transformed to the array antenna coordinate system; The azimuth and elevation angles are calculated based on the observation vectors in the array antenna coordinate system.

10. The method for controlling amplitude and phase distortion introduced by the receiving channel of high-precision anti-interference navigation according to claim 1, characterized in that, The research and development phase precedes the design phase, during which: Four-point feeding, choke coil, and maximum permissible deviation are used to limit the error sources of the antenna array elements, while error distribution and component selection are used to limit the error sources of the radio frequency channel.

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