A multi-channel correction method and system for baseband and intermediate frequency multifunction integration

Abstract

The application discloses a kind of baseband and multi-channel correction method and system of multi-functional integration of intermediate frequency, and the method comprises: baseband correction: through intermediate frequency integer point correction, baseband time delay correction and amplitude and phase correction to realize three-level correction, intermediate frequency integer point correction is corrected to integer point time difference by time delay compensation, baseband time delay correction is corrected to decimal time difference by time delay compensation, and amplitude and phase correction is corrected to in-band phase fluctuation and amplitude difference;Baseband and intermediate frequency integrated correction: based on intermediate frequency integer point correction, integer point compensation is carried out to baseband and intermediate frequency application, after integer point compensation is completed, baseband and intermediate frequency application are shunted and handled, and preset frequency interval is used to carry out amplitude and phase correction to intermediate frequency application, and the coefficient of amplitude and phase correction is based on the correction data of baseband application, and finally the correction data of intermediate frequency application is formed.The application can realize the compatibility demand of multiple channel application correction process under the comprehensive integration of multiple function applications.

Description

Technical Field

[0001] This invention relates to the field of signal processing technology for electronic devices, and in particular to a multi-channel correction method and system integrating baseband and intermediate frequency functions. Background Technology

[0002] In multi-channel receiving systems, when there are strict requirements for amplitude and phase consistency between channels, it is necessary to correct for the amplitude and phase consistency between channels. In the field of electronic target sensing, the receiving bandwidth is wideband, and system amplitude and phase correction is usually performed at the intermediate frequency of the receiver in fixed steps. In radar detection and communication transmission fields, correction is usually performed at the baseband conversion amplitude and phase difference.

[0003] Most correction methods used in space platform array reception and processing are performed in the baseband. A typical method is "Amplitude and Phase Error Correction of Spaceborne DBF Tx RF Channel" [J] Journal of Electronics and Information Technology, 2008, 30(9): 2182-2184. This method injects a correction test signal after the DBF network in the baseband, receives the sum of all array element signals at the antenna array input port, and then uses the time correlation of orthogonal code signals and IDFT parallel processing technology to simultaneously obtain the correction factors of all channels. The obtained correction factors are normalized to the reference channel to avoid the influence of the obtained correction factors on the nonlinear devices of the RF channel. The specific design is as follows: Figure 1 As shown. This method is only applicable to one function and cannot meet the intermediate frequency correction requirements of other detection functions.

[0004] When the system includes multiple functions such as radar target perception, communication target perception and radar detection, the correction process of each function is carried out independently, which requires more hardware processing resources and time consumption. Summary of the Invention

[0005] To address the aforementioned issues, this invention proposes a multi-channel calibration method and system integrating baseband and intermediate frequency functions. Radar detection and target perception applications share the first-level intermediate frequency integer-point calibration. After integer-point compensation, radar detection and target perception processes are separated. Baseband calibration is primarily performed based on radar detection, while radar target perception and communication target perception functions use the baseband calibration data from radar detection to calculate intermediate frequency calibration parameters, ultimately forming the calibration data for target perception. This invention achieves compatibility of the calibration process in multi-channel applications with multiple integrated functionalities.

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

[0007] A multi-channel calibration method integrating baseband and intermediate frequency functions includes:

[0008] Baseband correction: Three-level correction is achieved through intermediate frequency integer point correction, baseband time delay correction and amplitude-phase correction. The intermediate frequency integer point correction corrects the integer point time difference through time delay compensation. The baseband time delay correction corrects the fractional time difference through time delay compensation. The amplitude-phase correction corrects the in-band phase fluctuation and amplitude difference.

[0009] Integrated baseband and intermediate frequency correction: Based on the intermediate frequency integer point correction, integer point compensation is performed on the baseband and intermediate frequency applications. After the integer point compensation is completed, the baseband and intermediate frequency applications are split and processed. The amplitude and phase correction is performed on the intermediate frequency application using a preset frequency interval. The coefficients of the amplitude and phase correction are based on the correction data of the baseband application, and finally the correction data of the intermediate frequency application is formed.

[0010] Furthermore, the phase relationship of the entire correction link is as follows:

[0011] φ 基带1 =φ 中1 -2π*f i *D1+φ lo -2π*f0*τ1+φ coe1 (1)

[0012] φ 基带2 =φ 中2 -2π*f i *D2+φ lo -2π*f0*τ2+φ coe2 (2)

[0013] Where, φ 基带1 Let φ be the phase of the baseband signal of channel 1 at a certain moment. 基带2 φ represents the baseband signal phase of channel 2 at the same time. 中1 φ represents the phase of the intermediate frequency signal in channel 1 at the same time. 中2 f represents the phase of the intermediate frequency signal in channel 2 at the same time. i Where is the input signal frequency, D1 is the integer-point delay of channel 1, D2 is the integer-point delay of channel 2, and φ is... lo Let f0 be the phase of the baseband frequency conversion local oscillator, f1 be the baseband frequency, τ1 be the decimal point delay of channel 1, τ2 be the decimal point delay of channel 2, and φ be the phase of the baseband frequency conversion local oscillator. coe1 The baseband correction coefficient phase for channel 1, φ coe2 The phase of the baseband correction coefficient for channel 2;

[0014] The calibration ends when the following conditions are met:

[0015] φ 基带1 =φ 基带2 .

[0016] Furthermore, the baseband calibration includes the following steps:

[0017] Step 1: Set D1, D2, τ1, τ2, φ coe1 and φ coe2 Set all values ​​to 0, and set Amp to 0. coe1 Amp coe2 Set to 1, where Amp coe1 Amp coe2 These are the baseband correction coefficient amplitudes for channel 1 and channel 2, respectively.

[0018] Step 2: Set the calibration signal frequency f i1 Collect baseband data and calculate the φ of the baseband signal at this time. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 Amp 基带1 and Amp 基带2 These represent the baseband signal amplitudes of channel 1 and channel 2, respectively.

[0019] Step 3: Sequentially switch the correction signal frequency f i2 ~f i5 Once the φ of the baseband signal at the correction frequency point is obtained again. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 ;

[0020] Step 4: Calculate the channel delay ΔT using the relationship between time and phase:

[0021] φ=2π*f i *ΔT (3)

[0022] Where φ is the correction frequency point φ obtained in step three. 基带1 φ 基带2 ΔT is the channel delay corresponding to φ. The integer part of ΔT is identified by D, and the fractional part by τ. The channel delay is linear with respect to all frequencies within the channel. For the nonlinear phase component between different frequencies within the channel, the baseband correction coefficient phase φ is used. coe Logo;

[0023] Step 5: For the amplitude information of multiple correction frequency points within the receiver band, linear fitting is used to fit the amplitude information of all frequency points within the full bandwidth. Combined with the phase residual of the nonlinear part, correction is performed using a preset frequency interval to obtain the correction data except for the channel delay.

[0024] Furthermore, the integrated baseband and intermediate frequency correction includes:

[0025] For integrated baseband and intermediate frequency (IF) applications, the IF correction data is calculated using the baseband correction data from formulas (1) and (2):

[0026] φ coe3 =2π*f0*τ1-φ coe1 (4)

[0027] φ coe4 =2π*f0*τ2-φ coe2 (5)

[0028] Amp coe3 =Amp coe1 (6)

[0029] Amp coe4 =Amp coe2 (7)

[0030] That is, using baseband correction data φ coe1 φ coe2 Amp coe1 Amp coe2 The intermediate frequency correction data φ is calculated from τ1 and τ2. coe3 φ coe4 Amp coe3 Amp coe4 .

[0031] Furthermore, for integrated systems combining multiple application functions, integer point compensation is performed on radar target perception applications, communication target perception applications, and radar detection applications based on the aforementioned intermediate frequency integer point correction. After the integer point compensation is completed, the radar target perception applications, communication target perception applications, and radar detection applications are processed separately. Baseband correction is performed primarily on the radar detection application, while the radar target perception applications and communication target perception applications use the baseband correction data from the radar detection application to back-calculate the intermediate frequency correction parameters, ultimately forming the correction data for the radar target perception applications and communication target perception applications.

[0032] A multi-channel correction system integrating baseband and intermediate frequency functions includes:

[0033] The baseband correction module is configured to achieve three-level correction through intermediate frequency integer point correction, baseband time delay correction, and amplitude-phase correction. The intermediate frequency integer point correction corrects the integer point time difference through time delay compensation, the baseband time delay correction corrects the fractional time difference through time delay compensation, and the amplitude-phase correction corrects the in-band phase fluctuation and amplitude difference.

[0034] The integrated baseband and intermediate frequency correction module is configured to perform integer point compensation on the baseband and intermediate frequency applications based on the intermediate frequency integer point correction. After the integer point compensation is completed, the baseband and intermediate frequency applications are split and processed. The amplitude and phase correction is performed on the intermediate frequency applications using a preset frequency interval. The coefficients of the amplitude and phase correction are based on the correction data of the baseband application, and finally form the correction data of the intermediate frequency application.

[0035] Furthermore, the phase relationship of the entire correction link is as follows:

[0036] φ 基带1 =φ 中1 -2π*f i *D1+φ lo -2π*f0*τ1+φ coe1 (1)

[0037] φ 基带2 =φ 中2 -2π*f i *D2+φ lo -2π*f0*τ2+φ coe2 (2)

[0038] Where, φ 基带1 Let φ be the phase of the baseband signal of channel 1 at a certain moment. 基带2 φ represents the baseband signal phase of channel 2 at the same time. 中1 φ represents the phase of the intermediate frequency signal in channel 1 at the same time. 中2 f represents the phase of the intermediate frequency signal in channel 2 at the same time. i Where is the input signal frequency, D1 is the integer-point delay of channel 1, D2 is the integer-point delay of channel 2, and φ is... lo Let f0 be the phase of the baseband frequency conversion local oscillator, f1 be the baseband frequency, τ1 be the decimal point delay of channel 1, τ2 be the decimal point delay of channel 2, and φ be the phase of the baseband frequency conversion local oscillator. coe1 The baseband correction coefficient phase for channel 1, φ coe2 The phase of the baseband correction coefficient for channel 2;

[0039] The calibration ends when the following conditions are met:

[0040] φ 基带1 =φ 基带2 .

[0041] Furthermore, the baseband correction module includes:

[0042] Unit 1: D1, D2, τ1, τ2, φ coe1 and φ coe2 Set all values ​​to 0, and set Amp to 0. coe1 Amp coe2 Set to 1, where Amp coe1 Amp coe2 These are the baseband correction coefficient amplitudes for channel 1 and channel 2, respectively.

[0043] Unit 2: Setting the correction signal frequency f i1 Collect baseband data and calculate the φ of the baseband signal at this time. 基带1 φ 基带2 Amp 基带1and Amp 基带2 Amp 基带1 and Amp 基带2 These represent the baseband signal amplitudes of channel 1 and channel 2, respectively.

[0044] Unit 3: Sequentially switch the correction signal frequency point f i2 ~f i5 Once the φ of the baseband signal at the correction frequency point is obtained again. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 ;

[0045] Unit 4: Calculating the channel delay ΔT using the relationship between time and phase:

[0046] φ=2π*f i *ΔT (3)

[0047] Where φ is the correction frequency point φ obtained from Unit 3. 基带1 φ 基带2 ΔT is the channel delay corresponding to φ. The integer part of ΔT is identified by D, and the fractional part by τ. The channel delay is linear with respect to all frequencies within the channel. For the nonlinear phase component between different frequencies within the channel, the baseband correction coefficient phase φ is used. coe Logo;

[0048] Unit 5: For the amplitude information of multiple correction frequency points within the receiver band, linear fitting is used to fit the amplitude information of all frequency points within the full bandwidth. Combined with the phase residual of the nonlinear part, correction is performed using a preset frequency interval to obtain the correction data except for the channel delay.

[0049] Furthermore, the integrated baseband and intermediate frequency correction module includes:

[0050] For integrated baseband and intermediate frequency (IF) applications, the IF correction data is calculated using the baseband correction data from formulas (1) and (2):

[0051] φ coe3 =2π*f0*τ1-φ coe1 (4)

[0052] φ coe4 =2π*f0*τ2-φ coe2 (5)

[0053] Amp coe3 =Amp coe1 (6)

[0054] Amp coe4 =Amp coe2 (7)

[0055] That is, using baseband correction data φ coe1 φ coe2 Amp coe1 Amp coe2 The intermediate frequency correction data φ is calculated from τ1 and τ2. coe3 φ coe4 Amp coe3 Amp coe4 .

[0056] Furthermore, for integrated systems combining multiple application functions, integer point compensation is performed on radar target perception applications, communication target perception applications, and radar detection applications based on the aforementioned intermediate frequency integer point correction. After the integer point compensation is completed, the radar target perception applications, communication target perception applications, and radar detection applications are processed separately. Baseband correction is performed primarily on the radar detection application, while the radar target perception applications and communication target perception applications use the baseband correction data from the radar detection application to back-calculate the intermediate frequency correction parameters, ultimately forming the correction data for the radar target perception applications and communication target perception applications.

[0057] The beneficial effects of this invention are as follows:

[0058] 1. In this invention, radar detection and target perception applications share the first-level intermediate frequency integer point correction. After integer point compensation is completed, radar detection and target perception are processed separately. Radar detection is the primary method for baseband correction, while radar target perception and communication target perception functions use the baseband correction data from radar detection to calculate the intermediate frequency correction parameters, ultimately forming the correction data for target perception. This invention achieves compatibility of the correction process in multi-channel applications with multiple integrated functional applications.

[0059] 2. This invention is mainly applied to multi-channel baseband and intermediate frequency multi-functional integrated application scenarios. Through this invention, the functional requirements of both baseband and intermediate frequency applications can be completed in a single calibration process, taking into account the conventional processing flow of both applications and simplifying system design. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of a typical baseband radar detection and correction method.

[0061] Figure 2 This is a flowchart of the baseband calibration process in Embodiment 1 of the present invention.

[0062] Figure 3 This is a flowchart of the integrated baseband and intermediate frequency correction process in Embodiment 1 of the present invention.

[0063] Figure 4 This is one of the correction data in Embodiment 1 of the present invention.

[0064] Figure 5This is the second correction data in Embodiment 1 of the present invention. Detailed Implementation

[0065] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments are now described. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0066] Example 1

[0067] This embodiment provides a multi-channel calibration method integrating baseband and intermediate frequency (IF) functions, including baseband calibration and integrated baseband and IF calibration. Baseband calibration achieves three levels of calibration through IF integer-point calibration, baseband time delay calibration, and amplitude-phase calibration. IF integer-point calibration corrects integer-point time differences through time delay compensation, baseband time delay calibration corrects fractional-point time differences through time delay compensation, and amplitude-phase calibration corrects in-band phase fluctuations and amplitude differences. Integrated baseband and IF calibration performs integer-point compensation on both baseband and IF applications based on IF integer-point calibration. After integer-point compensation, the baseband and IF applications are processed separately, and amplitude-phase calibration is performed on the IF application using a preset frequency interval. The amplitude-phase calibration coefficients are based on the calibration data of the baseband application, ultimately forming the calibration data for the IF application.

[0068] like Figure 2 The diagram shows the baseband calibration process. In the diagram, LO is the center frequency of the receiver. The baseband calibration process is divided into three stages. The first stage is completed at the intermediate frequency (IF), mainly to correct the integer time difference, and to correct the inconsistency between channels through time delay compensation. The second stage is the baseband time delay correction process, mainly to correct the fractional time difference, also through time delay. The third stage is amplitude and phase compensation, mainly to correct the in-band phase fluctuation and amplitude difference after time delay difference correction.

[0069] The phase relationship of the entire correction link is as follows:

[0070] φ 基带1 =φ 中1 -2π*f i *D1+φ lo -2π*f0*τ1+φ coe1 (1)

[0071] φ 基带2 =φ 中2 -2π*f i *D2+φ lo -2π*f0*τ2+φcoe2 (2)

[0072] Where, φ 基带1 Let φ be the phase of the baseband signal of channel 1 at a certain moment. 基带2 φ represents the baseband signal phase of channel 2 at the same time. 中1 φ represents the phase of the intermediate frequency signal in channel 1 at the same time. 中2 f represents the phase of the intermediate frequency signal in channel 2 at the same time. i Where is the input signal frequency, D1 is the integer-point delay of channel 1, D2 is the integer-point delay of channel 2, and φ is... lo Let f0 be the phase of the baseband frequency conversion local oscillator, f1 be the baseband frequency, τ1 be the decimal point delay of channel 1, τ2 be the decimal point delay of channel 2, and φ be the phase of the baseband frequency conversion local oscillator. coe1 The baseband correction coefficient phase for channel 1, φ coe2 The phase is the baseband correction coefficient for channel 2.

[0073] The purpose of correction is to make:

[0074] φ 基带1 =φ 基带2 .

[0075] Preferably, baseband calibration includes the following steps:

[0076] Step 1: Set D1, D2, τ1, τ2, φ coe1 and φ coe2 Set all values ​​to 0, and set Amp to 0. coe1 Amp coe2 Set to 1, where Amp coe1 Amp coe2 These are the baseband correction coefficient amplitudes for channel 1 and channel 2, respectively.

[0077] Step 2: Set the calibration signal frequency f i1 Collect baseband data and calculate the φ of the baseband signal at this time. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 Amp 基带1 and Amp 基带2 These are the baseband signal amplitudes for channel 1 and channel 2, respectively.

[0078] Step 3: Sequentially switch the correction signal frequency f i2 ~f i5 Once the φ of the baseband signal at the correction frequency point is obtained again. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 .

[0079] It should be noted that 5 frequency points is the minimum number of frequency points, because the correction frequency points must include the two boundary frequency points of the receiving bandwidth, the center frequency point, and the frequency points in the two half-bands. More frequency points will increase the complexity.

[0080] Step 4: Calculate the channel delay ΔT using the relationship between time and phase:

[0081] φ=2π*f i *ΔT (3)

[0082] Where φ is the correction frequency point φ obtained in step three. 基带1 φ 基带2 ΔT is the channel delay corresponding to φ. The integer part of ΔT is identified by D, and the fractional part by τ. The channel delay is linear with respect to all frequencies within the channel. For the nonlinear phase component between different frequencies within the channel, the baseband correction coefficient phase φ is used. coe Logo.

[0083] The measurement of φ exhibits a 360° ambiguity phenomenon. Considering that the channel delay difference in the system design is within a certain range, this embodiment designs a limited number of 5 correction frequency points to resolve the ambiguity and obtain the final ΔT.

[0084] Step 5: For the amplitude information of multiple correction frequency points within the receiver band, linear fitting is used to fit the amplitude information of all frequency points within the full bandwidth. Combining this with the phase residual of the nonlinear part, correction is performed at 20MHz intervals within a 400MHz receiving bandwidth in this embodiment, obtaining correction data excluding time delay D and τ, as shown below. Figure 4 As shown.

[0085] For integrated baseband and intermediate frequency (IF) applications, based on the aforementioned baseband correction, this embodiment designs the following IF application correction process, as follows: Figure 3 As shown, the intermediate frequency (IF) and baseband applications share the first-level integer point correction. After the integer point compensation is completed, the baseband and IF processing are separated. The IF correction directly uses a 20MHz frequency interval for amplitude and phase correction, where the amplitude and phase correction coefficients are formed from the baseband correction data to form the final IF correction data.

[0086] Calculate using the baseband correction data from formulas (1) and (2):

[0087] φ coe3 =2π*f0*τ1-φ coe1 (4)

[0088] φ coe4 =2π*f0*τ2-φ coe2 (5)

[0089] Amp coe3 =Amp coe1 (6)

[0090] Amp coe4 =Amp coe2 (7)

[0091] In equations (4) and (5), f0 is the baseband frequency corresponding to the signal, and the baseband correction data φ is used. coe1 φ coe2 Amp coe1 Amp coe2 The intermediate frequency correction data are calculated using τ1 and τ2, such as... Figure 5 As shown.

[0092] Preferably, for an integrated system combining multiple application functions, integer point compensation is performed on radar target perception application, communication target perception application and radar detection application based on intermediate frequency integer point correction. After the integer point compensation is completed, the radar target perception application, communication target perception application and radar detection application are processed separately. Baseband correction is performed mainly on radar detection application, while the radar target perception application and communication target perception application use the baseband correction data of radar detection application to back-calculate intermediate frequency correction parameters, and finally form the correction data of radar target perception application and communication target perception application.

[0093] Example 2

[0094] This embodiment provides a multi-channel correction system integrating baseband and intermediate frequency functions, including:

[0095] The baseband correction module is configured to achieve three levels of correction through intermediate frequency integer point correction, baseband time delay correction, and amplitude-phase correction. Intermediate frequency integer point correction corrects the integer point time difference through time delay compensation, baseband time delay correction corrects the fractional time difference through time delay compensation, and amplitude-phase correction corrects the in-band phase fluctuation and amplitude difference.

[0096] The integrated baseband and intermediate frequency correction module is configured to perform integer point compensation on the baseband and intermediate frequency applications based on the integer point correction of the intermediate frequency. After the integer point compensation is completed, the baseband and intermediate frequency applications are processed separately, and the amplitude and phase correction of the intermediate frequency application is performed using a preset frequency interval. The amplitude and phase correction coefficients are based on the correction data of the baseband application, and finally form the correction data of the intermediate frequency application.

[0097] Preferably, the phase relationship of the entire correction link is as follows:

[0098] φ 基带1 =φ 中1 -2π*f i *D1+φ lo -2π*f0*τ1+φ coe1 (1)

[0099] φ 基带2 =φ中2 -2π*f i *D2+φ lo -2π*f0*τ2+φ coe2 (2)

[0100] Where, φ 基带1 Let φ be the phase of the baseband signal of channel 1 at a certain moment. 基带2 φ represents the baseband signal phase of channel 2 at the same time. 中1 φ represents the phase of the intermediate frequency signal in channel 1 at the same time. 中2 f represents the phase of the intermediate frequency signal in channel 2 at the same time. i Where is the input signal frequency, D1 is the integer-point delay of channel 1, D2 is the integer-point delay of channel 2, and φ is... lo Let f0 be the phase of the baseband frequency conversion local oscillator, f1 be the baseband frequency, τ1 be the decimal point delay of channel 1, τ2 be the decimal point delay of channel 2, and φ be the phase of the baseband frequency conversion local oscillator. coe1 The baseband correction coefficient phase for channel 1, φ coe2 The phase is the baseband correction coefficient for channel 2.

[0101] The calibration ends when the following conditions are met:

[0102] φ 基带1 =φ 基带2 .

[0103] Preferably, the baseband correction module includes:

[0104] Unit 1: D1, D2, τ1, τ2, φ coe1 and φ coe2 Set all values ​​to 0, and set Amp to 0. coe1 Amp coe2 Set to 1, where Amp coe1 Amp coe2 These are the baseband correction coefficient amplitudes for channel 1 and channel 2, respectively.

[0105] Unit 2: Setting the correction signal frequency f i1 Collect baseband data and calculate the φ of the baseband signal at this time. 基带1 φ 基带2 Amp 基带1 and Amp 基带2 Amp 基带1 and Amp 基带2 These represent the baseband signal amplitudes of channel 1 and channel 2, respectively.

[0106] Unit 3: Sequentially switch the correction signal frequency point f i2 ~f i5 Once the φ of the baseband signal at the correction frequency point is obtained again. 基带1 φ 基带2 Amp基带1 and Amp 基带2 ;

[0107] Unit 4: Calculating the channel delay ΔT using the relationship between time and phase:

[0108] φ=2π*f i *ΔT (3)

[0109] Where φ is the correction frequency point φ obtained from Unit 3. 基带1 φ 基带2 ΔT is the channel delay corresponding to φ. The integer part of ΔT is identified by D, and the fractional part by τ. The channel delay is linear with respect to all frequencies within the channel. For the nonlinear phase component between different frequencies within the channel, the baseband correction coefficient phase φ is used. coe Logo;

[0110] Unit 5: For the amplitude information of multiple correction frequency points within the receiver band, linear fitting is used to fit the amplitude information of all frequency points within the full bandwidth. Combined with the phase residual of the nonlinear part, correction is performed using a preset frequency interval to obtain the correction data except for the channel delay.

[0111] Preferably, the integrated baseband and intermediate frequency correction module includes:

[0112] For integrated baseband and intermediate frequency (IF) applications, the IF correction data is calculated using the baseband correction data from formulas (1) and (2):

[0113] φ coe3 =2π*f0*τ1-φ coe1 (4)

[0114] φ coe4 =2π*f0*τ2-φ coe2 (5)

[0115] Amp coe3 =Amp coe1 (6)

[0116] Amp coe4 =Amp coe2 (7)

[0117] That is, using baseband correction data φ coe1 φ coe2 Amp coe1 Amp coe2 The intermediate frequency correction data φ is calculated from τ1 and τ2. coe3 φ coe4 Amp coe3 Amp coe4 .

[0118] Preferably, for an integrated system combining multiple application functions, integer point compensation is performed on radar target perception application, communication target perception application and radar detection application based on intermediate frequency integer point correction. After the integer point compensation is completed, the radar target perception application, communication target perception application and radar detection application are processed separately. Baseband correction is performed mainly on radar detection application, while the radar target perception application and communication target perception application use the baseband correction data of radar detection application to back-calculate intermediate frequency correction parameters, and finally form the correction data of radar target perception application and communication target perception application.

[0119] It should be noted that, for the sake of simplicity, the foregoing method embodiments are described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

Claims

1. A multi-channel calibration method integrating baseband and intermediate frequency functions, characterized in that, This includes baseband correction, which includes the following steps: Step 1: Place D1, D2, , , and Set all to 0, and , Set to 1, where , These are the baseband correction coefficient amplitudes for channel 1 and channel 2, respectively; Step 2: Set the calibration signal frequency f i1 Collect baseband data and calculate the baseband signal at this time. , , and ,in and These represent the baseband signal amplitudes of channel 1 and channel 2, respectively. Step 3: Sequentially switch the correction signal frequency f i2 ~f i5 Once the baseband signal at the correction frequency point is obtained again , , and ; Step 4: Calculate the channel delay using the relationship between time and phase. : （1） in, The correction frequency point obtained in step three , , To and The corresponding channel delay, The integer part is identified by D, and the fractional part by D. The channel delay is linear with respect to all frequencies within the channel. For the nonlinear phase component between different frequencies within the channel, a baseband correction coefficient is used for the phase. Logo; Step 5: For the amplitude information of multiple correction frequency points within the receiver band, linear fitting is used to fit the amplitude information of all frequency points within the full bandwidth. Combined with the phase residual of the nonlinear part, correction is performed using a preset frequency interval to obtain the correction data except for the channel delay. The phase relationship of the entire correction link is as follows: （2） （3） in, Let be the baseband signal phase of channel 1 at a certain moment. The baseband signal phase of channel 2 at the same time. The phase of the intermediate frequency signal in channel 1 at the same time. f represents the phase of the intermediate frequency signal in channel 2 at the same time. i Where D1 is the input signal frequency, D2 is the integer-point delay of channel 1, and D2 is the integer-point delay of channel 2. The phase of the baseband frequency conversion local oscillator. For baseband frequency, For the decimal point delay of channel 1, For the decimal point delay of channel 2, The baseband correction coefficient phase for channel 1. The phase of the baseband correction coefficient for channel 2; Phase correction ends when the following conditions are met: 。 2. The multi-channel correction method integrating baseband and intermediate frequency functions according to claim 1, characterized in that, It also includes integrated baseband and intermediate frequency correction: For integrated baseband and intermediate frequency applications, the intermediate frequency correction data is calculated using the baseband correction data from formulas (2) and (3): （4） （5） （6） （7） That is, using baseband correction data , , , , and Calculate the intermediate frequency correction data , , , .

3. A multi-channel correction method integrating baseband and intermediate frequency functions as described in claim 1 or 2, characterized in that, For integrated systems combining multiple application functions, integer point compensation is performed on radar target perception applications, communication target perception applications, and radar detection applications based on intermediate frequency integer point correction. After integer point compensation is completed, the radar target perception applications, communication target perception applications, and radar detection applications are processed separately. Baseband correction is performed mainly on the radar detection application, while the radar target perception applications and communication target perception applications use the baseband correction data of the radar detection application to back-calculate the intermediate frequency correction parameters, ultimately forming the correction data for the radar target perception applications and communication target perception applications.

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