A method and apparatus for delay sampling of broadband signals
By decomposing broadband signals into multiple parallel narrowband signals and performing delay processing and calibration, and utilizing single-channel low-speed sampling and synthesis processing, the complexity and cost issues brought about by multi-channel schemes are solved, and the effective digitization of broadband signals is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN YUXIN TECH CO LTD
- Filing Date
- 2022-10-28
- Publication Date
- 2026-07-31
AI Technical Summary
Existing technologies for digitizing broadband signals use multi-channel schemes that increase system complexity and cost, and high-speed sampling is difficult to achieve through low-speed sampling with a single channel.
The broadband signal is decomposed into multiple parallel narrowband signals using a frequency band decomposition method. After delay processing, the signals do not overlap in time. The signals are sampled sequentially using a single sampling channel. Through delay calibration, upsampling, frequency shifting, splicing, and synthesis processing, the broadband signal can be sampled at low speed.
By using a single-channel low-speed sampling method, the system complexity and cost are reduced, the problem of high-speed sampling of broadband signals is solved, and effective broadband signal digitization is achieved.
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Figure CN115842553B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of digital signal processing technology, specifically relating to a method and apparatus for delay sampling of broadband signals. Background Technology
[0002] When analog signals are digitized, analog-to-digital conversion is required through sampling and quantization. Sampling involves taking values at discrete time intervals of a continuous-time signal, thus converting the continuous-time signal into a discrete-time signal.
[0003] According to the sampling theorem, if a real continuous signal has a finite bandwidth, when the sampling frequency is greater than twice the signal bandwidth, the continuous-time signal can be uniquely determined by the sampled discrete signal. The sampling theorem determines the relationship between the sampling frequency and the bandwidth of the real continuous signal.
[0004] The technical challenge of digitizing broadband signals is immense, limited by the performance constraints of devices such as high-speed analog-to-digital converters (ADCs). Therefore, in practical engineering implementations, if a single device cannot meet the broadband sampling requirements, a multi-channel approach is typically employed. This involves decomposing the broadband signal into multiple narrowband signals, digitizing each narrowband signal using multiple narrowband channels and a low-speed ADC, and then obtaining the broadband sampled signal through signal processing. This multi-channel approach to broadband signal sampling increases the complexity and cost of the system implementation.
[0005] Therefore, there is a need in this field to digitize broadband signals using single-channel, low-speed sampling. Summary of the Invention
[0006] Based on the above analysis, the present invention aims to disclose a delay sampling method and apparatus for broadband signals, which can overcome the shortcomings of traditional broadband signal sampling methods and reduce the requirements for sampling frequency while using a single channel for sampling.
[0007] This invention discloses a delay sampling method for broadband signals, comprising:
[0008] Step S1: Decompose the broadband signal into N parallel narrowband signals; N≥2;
[0009] Step S2: Delay the N parallel narrowband signals to obtain N delayed narrowband signals that do not overlap in time.
[0010] Step S3: Based on the time order of the N narrowband signals after the delay, sample each narrowband signal sequentially using a single sampling channel to obtain the narrowband sampled signal sequence;
[0011] Step S4: After decomposing the narrowband sampled signal sequence in time order, output it to N parallel processing channels. In each parallel processing channel, the input narrowband sampled signal is upsampled, frequency shifted, and spliced to obtain the sampled signal of the wide signal.
[0012] Furthermore, before performing delay processing, a reference signal is superimposed and mixed with each narrowband signal to obtain a mixed signal;
[0013] After sampling the mixed signal, the sampled signal of the reference signal is extracted from the sampled signal of the mixed signal, and the delay error of the reference signal between each sampling channel is calculated as the delay calibration signal of each channel, which is used to calibrate the delay error of the narrowband sampled signal of each channel.
[0014] Furthermore, the reference signal is co-coordinated with the sampling clock of the sampling channel.
[0015] Furthermore, the period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals.
[0016] Furthermore, the delay time for each of the N parallel narrowband signals is an integer multiple of the period of the reference signal.
[0017] Furthermore, step S4 specifically includes,
[0018] 1) The narrowband sampled signal sequence is decomposed in time order and then output to N parallel processing channels;
[0019] 2) Extract the sampled signal of the reference signal from each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay;
[0020] 3) Upsample the narrowband sampling signal for each channel;
[0021] 4) Perform delay error calibration for each channel based on the upsampled signal and the corresponding delay calibration signal;
[0022] 5) The upsampled signal after delay error calibration is frequency shifted and spliced to obtain the sampled signal of the width signal.
[0023] The present invention also discloses a delay sampling device for broadband signals, comprising:
[0024] The signal decomposition module is used to decompose a broadband signal into N parallel narrowband signals; N≥2;
[0025] The parallel delay module is used to delay N parallel narrowband signals to obtain N delayed narrowband signals that do not overlap in time.
[0026] The narrowband sampling module is used to sample each of the N narrowband signals sequentially using a single sampling channel according to the time order of the N narrowband signals after the delay, thereby obtaining a narrowband sampled signal sequence.
[0027] The sampling output module is used to decompose the narrowband sampled signal sequence in time order and output it to N parallel processing channels. In each parallel processing channel, the input narrowband sampled signal is upsampled, frequency shifted and spliced to obtain the sampled signal of the wide signal.
[0028] Furthermore, the parallel delay module includes N signal mixing modules, N delay modules, a sampling and synchronization signal generation module, and a channel merging module;
[0029] The N parallel narrowband signals output by the broadband signal decomposition module are respectively input to N signal mixing modules, and the N signal mixing modules are connected to N delay modules respectively.
[0030] Each of the signal mixing modules is used to superimpose and mix the reference signal with the input narrowband signal to obtain a mixed signal;
[0031] Each delay module is used to delay the input mixed signal with a corresponding delay time;
[0032] The channel merging module is connected to each delay module and is used to merge the mixed signals output by N delay modules into one channel in time order and output it to the narrowband sampling module.
[0033] The sampling and synchronization signal generation module is used to generate a reference signal and output it to each signal mixing module in N channels to mix with the input narrowband signal; generate a delay control signal corresponding to each delay module and output it to the corresponding delay module to control the delay time of the delay module; and generate a sampling clock signal and output it to the narrowband sampling module.
[0034] Furthermore, the reference signal is co-coordinated with the sampling clock signal; the period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals; and the delay time of the delay control signal is an integer multiple of the period of the reference signal.
[0035] Furthermore, the sampling output module includes a channel calibration parameter extraction module, a channel decomposition module, N upsampling processing modules, N calibration processing modules, N frequency shifting processing modules, and a frequency splicing module;
[0036] The channel calibration parameter extraction module is used to extract the sampled signal of the reference signal in each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay, and output it to the corresponding calibration processing module;
[0037] The channel decomposition module is used to decompose the narrowband sampled signal sequence into N channels according to the time sequence and output them to N upsampling processing modules; the N upsampling processing modules, N calibration processing modules and N frequency shift processing modules are connected in sequence accordingly;
[0038] Each of the upsampling processing modules is used to upsample the input narrowband sampled signal and then output it to the corresponding calibration processing module.
[0039] Each of the calibration processing modules is used to calibrate the upsampled signal of each channel with the input delay calibration signal, and then output it to the corresponding frequency shift processing module.
[0040] Each of the frequency shift processing modules is used to perform frequency shift processing on the calibrated sampled signal and then output it to the frequency splicing module; the frequency shift processing maps the frequency range of each channel sampled signal to the frequency band corresponding to the broadband signal before decomposition in this embodiment;
[0041] The frequency splicing module is used to splice and synthesize the frequency-shifted sampled signals of each channel to obtain a broadband sampled signal.
[0042] The present invention can achieve at least the following beneficial effects:
[0043] This invention discloses a method and apparatus for delay sampling of broadband signals. It uses a single channel to sample broadband signals, which solves the problems of system complexity and high cost caused by multi-channel schemes for sampling broadband signals. It also uses low-speed sampling to sample broadband signals, which solves the problem of the difficulty in achieving high-speed sampling of broadband signals. Attached Figure Description
[0044] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.
[0045] Figure 1 This is a flowchart of the broadband signal delay sampling method in an embodiment of the present invention;
[0046] Figure 2 This is a block diagram illustrating the principle of the broadband signal delay sampling device in an embodiment of the present invention.
[0047] Figure 3 This is a block diagram illustrating the principle of narrowband parallel delay serial sampling in an embodiment of the present invention.
[0048] Figure 4 This is a block diagram illustrating the principle of upsampling, frequency shifting, and splicing processing of narrowband sampling signals in an embodiment of the present invention. Detailed Implementation
[0049] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.
[0050] Example 1
[0051] An embodiment of the present invention discloses a delay sampling method for broadband signals, such as... Figure 1 As shown, it includes:
[0052] Step S1: Decompose the broadband signal into N parallel narrowband signals; N≥2;
[0053] Step S2: Delay the N parallel narrowband signals to obtain N delayed narrowband signals that do not overlap in time.
[0054] Step S3: Based on the time order of the N narrowband signals after the delay, sample each narrowband signal sequentially using a single sampling channel to obtain the narrowband sampled signal sequence;
[0055] Step S4: After decomposing the narrowband sampled signal sequence in time order, output it to N parallel processing channels. In each parallel processing channel, the input narrowband sampled signal is upsampled, frequency shifted, and spliced to obtain the sampled signal of the wide signal.
[0056] Considering that when delaying multiple parallel narrowband signals separately, the delay error of each signal will affect the signal sampling, in the preferred embodiment, before delaying, a reference signal is superimposed and mixed with each narrowband signal to obtain a mixed signal.
[0057] After sampling the mixed signal, the sampled signal of the reference signal is extracted from the sampled signal of the mixed signal, and the delay error of the sampled signal of the reference signal between each channel is calculated. This delay error is used as the delay calibration signal of each channel for the delay error calibration of the narrowband sampled signal of each channel.
[0058] Preferably, the reference signal is in phase with the sampling clock of the sampling channel;
[0059] Preferably, the period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals;
[0060] Preferably, the delay time for each of the N parallel narrowband signals is an integer multiple of the reference signal period.
[0061] Specifically, in step S1, the broadband signal is a broadband continuous signal, and the broadband continuous signal is decomposed into two or more adjacent narrowband signals.
[0062] Furthermore, during the frequency band decomposition, each narrowband signal is obtained by frequency shifting and low-pass filtering of the broadband continuous signal.
[0063] Furthermore, the frequency bands of narrowband signals in adjacent frequency bands may or may not overlap. The degree of overlap is determined based on the characteristics of the filter's transition band, ensuring that the frequency band synthesized by splicing all adjacent narrowband signals can cover the entire frequency range of the broadband signal.
[0064] In a more specific scheme, in step S1, the broadband continuous signal is decomposed into N narrowband signals. The broadband continuous signal is then filtered by N narrowband bandpass filters that are adjacent or intersecting, resulting in N narrowband signals with adjacent or partially overlapping frequency bands. The different narrowband signals are then frequency-shifted to obtain N parallel narrowband signals corresponding to different frequency bands.
[0065] In another more specific scheme, in step S1, the broadband continuous signal is directly divided into N channels of broadband continuous signal, then the signal of each channel is frequency shifted, and then the signal of each channel is low-pass filtered to obtain N parallel narrowband signals corresponding to different frequency bands.
[0066] Specifically, in step S2, different delays are applied to different narrowband signals. The delay of each narrowband signal is different. When performing the delay operation, the relative delay between narrowband signals of adjacent frequency bands is greater than or equal to the sampling time required for sampling the broadband signal.
[0067] For example, the sampled broadband signal has a bandwidth of B and a time width of T. s The sampling time of the corresponding sampled wideband signal is T. f (T f ≥T s Assume the wideband signal to be sampled is divided into N narrowband signals for sampling, and the sampling time of each narrowband signal is T. f_s Therefore, during each narrowband signal sampling, T is required. f_s ≥T s The total sampling time is not less than N×T f_s This allows for the sampling of N narrowband signals distributed over time.
[0068] In a specific scheme, in step S2, the reference signal and each narrowband signal are superimposed and mixed to obtain N mixed signals; after applying a corresponding time delay to each mixed signal, multiple delayed narrowband signals that do not overlap in time are obtained.
[0069] The reference signal is obtained by sampling the mixed frequency containing the reference signal and then filtering it. The delay error of each narrowband sampling signal is then calibrated using the sampled reference signal.
[0070] During the delay operation, the N narrowband signals correspond to N different delays, that is, the first narrowband signal corresponds to a delay of 0, the second narrowband signal corresponds to a delay of T. f_s The delay corresponding to the Nth narrowband signal is (N-1)×T. f_s All of the above delay times are integer multiples of the reference signal period.
[0071] Specifically, in step S3, since the occurrence times of each narrowband signal are different, the transmission can be carried out using a single narrowband signal channel based on the time order of the multiple narrowband signals after the delay.
[0072] Furthermore, during the sampling process, a low-speed sampling device for one sampling channel is used to sequentially sample each narrowband signal at low speed to obtain a narrowband sampled signal sequence, thus completing the signal sampling process.
[0073] Specifically, in step S4, the narrowband sampled signal sequence is decomposed in time order and output to multiple parallel processing channels; in each processing channel, the input narrowband signal is upsampled and frequency shifted; thus, the sampled signals of multiple narrowband signals corresponding to the frequencies of the multiple parallel narrowband signals in step S1 are obtained.
[0074] In a specific scheme, for a sampled signal sequence of a narrowband signal mixed with a reference signal, step S4 specifically includes:
[0075] 1) The narrowband sampled signal sequence is decomposed in time order and then output to N parallel processing channels.
[0076] 2) Extract the sampled signal of the reference signal from each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay;
[0077] Specifically, the sampled signal of the reference signal is extracted by filtering the narrowband sampled signal sequence.
[0078] 3) Upsample the narrowband sampled signal for each channel;
[0079] The upsampling frequency is not lower than the Nyquist frequency required for broadband signal sampling.
[0080] 4) Perform delay error calibration for each channel based on the upsampled signal of each channel and the corresponding delay calibration signal of each channel;
[0081] 5) The upsampled signal after delay error calibration is frequency shifted and spliced to obtain the sampled signal of the width signal.
[0082] Based on the correspondence between channels and signal frequency bands in this embodiment, the sampling signal of each channel is subjected to frequency shifting processing; through frequency shifting processing, the frequency range of the sampling signal of each channel is mapped to the frequency band corresponding to the broadband signal before decomposition in this embodiment;
[0083] The frequency-shifted sampled signals from each channel are spliced together to obtain a broadband sampled signal.
[0084] In summary, the broadband signal delay sampling method in this embodiment decomposes and delays the broadband signal to form multiple delayed narrowband signals that do not overlap in time. Then, it uses a single channel to sample the broadband signal, which solves the problems of system complexity and high cost caused by multi-channel solutions for broadband signal sampling. Furthermore, it uses low-speed sampling to sample the broadband signal, which solves the problem of the difficulty in achieving high-speed sampling of broadband signals.
[0085] Example 2
[0086] An embodiment of the present invention discloses a delay sampling device for broadband signals, such as... Figure 2 As shown, it includes:
[0087] The signal decomposition module is used to decompose a broadband signal into N parallel narrowband signals; N≥2;
[0088] The parallel delay module is used to delay N parallel narrowband signals to obtain N delayed narrowband signals that do not overlap in time.
[0089] The narrowband sampling module is used to sample each of the N narrowband signals sequentially using a single sampling channel according to the time order of the N narrowband signals after the delay, thereby obtaining a narrowband sampled signal sequence.
[0090] The sampling output module is used to decompose the narrowband sampled signal sequence in time order and output it to N parallel processing channels. In each parallel processing channel, the input narrowband sampled signal is upsampled, frequency shifted and spliced to obtain the sampled signal of the wide signal.
[0091] Preferably, the broadband signal decomposition module decomposes the broadband signal into N parallel narrowband signals;
[0092] like Figure 3 As shown, the parallel delay module includes N signal mixing modules, N delay modules, a sampling and synchronization signal generation module, and a channel merging module;
[0093] The N parallel narrowband signals output by the broadband signal decomposition module are respectively input to N signal mixing modules, and the N signal mixing modules are connected to N delay modules respectively.
[0094] Each of the signal mixing modules is used to superimpose and mix the reference signal with the input narrowband signal to obtain a mixed signal;
[0095] Each delay module is used to delay the input mixed signal with a corresponding delay time;
[0096] The channel merging module is connected to each delay module and is used to merge the mixed signals output by N delay modules into one channel in time order and output it to the narrowband sampling module.
[0097] The sampling and synchronization signal generation module is used to generate a reference signal and output it to each signal mixing module in N channels to mix with the input narrowband signal; generate a delay control signal corresponding to each delay module and output it to the corresponding delay module to control the delay time of the delay module; and generate a sampling clock signal and output it to the narrowband sampling module.
[0098] Specifically, the reference signal is in phase with the sampling clock signal; the period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals; and the delay time of the delay control signal is an integer multiple of the period of the reference signal.
[0099] like Figure 4 As shown, the sampling output module includes a channel calibration parameter extraction module, a channel decomposition module, N upsampling processing modules, N calibration processing modules, N frequency shifting processing modules, and a frequency splicing module;
[0100] The channel calibration parameter extraction module is used to extract the sampled signal of the reference signal in each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay, and output it to the corresponding calibration processing module;
[0101] The channel decomposition module is used to decompose the narrowband sampled signal sequence into N channels according to the time sequence and output them to N upsampling processing modules; the N upsampling processing modules, N calibration processing modules and N frequency shift processing modules are connected in sequence accordingly;
[0102] Each of the upsampling processing modules is used to upsample the input narrowband sampled signal and then output it to the corresponding calibration processing module.
[0103] Each of the calibration processing modules is used to calibrate the upsampled signal of each channel with the input delay calibration signal, and then output it to the corresponding frequency shift processing module.
[0104] Each of the frequency shift processing modules is used to perform frequency shift processing on the calibrated sampled signal and then output it to the frequency splicing module; the frequency shift processing maps the frequency range of each channel sampled signal to the frequency band corresponding to the broadband signal before decomposition in this embodiment;
[0105] The frequency splicing module is used to splice and synthesize the frequency-shifted sampled signals of each channel to obtain a broadband sampled signal.
[0106] The more specific technical details and corresponding technical effects in this embodiment are the same as in Embodiment 1. Please refer to Embodiment 1 for details, which will not be repeated here.
[0107] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A method of delay sampling a wideband signal, characterized by, include: Step S1, performing band decomposition on the broadband signal to obtain N parallel narrowband signals; N≥ 2； Step S2, delaying the narrowband signals in the two paths respectively to obtain delayed signals which do not overlap in time N Step S3, performing a correlation operation on the delayed signals in the two paths respectively to obtain correlation results N Step S4, performing a correlation operation on the correlation results in the two paths respectively to obtain correlation results Step S3, according to the time delay N The time sequence of the multiple narrowband signals is sampled in sequence by using a single sampling channel. Obtain the narrowband sampled signal sequence; Step S4, outputting the narrowband sampling signal sequence to the parallel processing channels in time sequence after decomposition N In each parallel processing channel, upsampling, frequency shifting and splicing and synthesizing are performed on the input narrowband sampling signal to obtain a sampling signal of a wideband signal.
2. The delayed sampling method according to claim 1, characterized in that, Before performing delay processing, a reference signal is superimposed and mixed with each narrowband signal to obtain a mixed signal; After sampling the mixed signal, the sampled signal of the reference signal is extracted from the sampled signal of the mixed signal, and the delay error of the reference signal between each sampling channel is calculated as the delay calibration signal of each channel, which is used to calibrate the delay error of the narrowband sampled signal of each channel.
3. The method of claim 2, wherein, The reference signal is in phase with the sampling clock of the sampling channel.
4. The delayed sampling method according to claim 3, characterized in that, The period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals.
5. The delayed sampling method according to claim 4, characterized in that, N The delay time for each of the parallel narrowband signals is an integer multiple of the period of the reference signal.
6. The delayed sampling method according to claim 2, characterized in that, Step S4 specifically includes, 1) The narrowband sampled signal sequence is decomposed in time order and then output to... N One parallel processing channel; 2) Extract the sampled signal of the reference signal from each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay; 3) Upsample the narrowband sampled signal for each channel; 4) Perform delay error calibration for each channel based on the upsampled signal and the corresponding delay calibration signal; 5) The upsampled signal after delay error calibration is frequency shifted and spliced to obtain the sampled signal of the broadband signal.
7. A delay sampling device for broadband signals, characterized in that, include: The signal decomposition module is used to decompose broadband signals into frequency bands. N Narrowband signals running in parallel; N≥ 2； Parallel delay module, used for... N Parallel narrowband signals are delayed separately to obtain non-overlapping delayed signals. N Narrowband signal; Narrowband sampling module, used to determine the time delay N To determine the time sequence of the narrowband signals, a single sampling channel is used to sample each narrowband signal sequentially. Obtain the narrowband sampled signal sequence; The sampling output module is used to decompose the narrowband sampled signal sequence in time order and output it to... N Each parallel processing channel performs upsampling, frequency shifting, and splicing on the input narrowband sampled signal to obtain the sampled signal of the broadband signal.
8. The delayed sampling device according to claim 7, characterized in that, The parallel delay module includes N Individual signal mixing module, N Each module includes a delay module, a sampling and synchronization signal generation module, and a channel merging module; The signal decomposition module outputs N Narrowband signals running in parallel are input to... N A signal mixing module, N Each signal mixing module and N Each delay module is connected accordingly; Each of the signal mixing modules is used to superimpose and mix the reference signal with the input narrowband signal to obtain a mixed signal; Each delay module is used to delay the input mixed signal with a corresponding delay time; The channel merging module is connected to each delay module to perform the merging. N The mixed signals output by the delay modules are combined into one channel in time sequence and then output to the narrowband sampling module. The sampling and synchronization signal generation module is used to generate reference signal subtraction. N The output is sent to each signal mixing module to mix with the input narrowband signal; and a delay control signal corresponding to each delay module is generated and output to the corresponding delay module to control the delay time of the delay module; A sampling clock signal is generated and output to the narrowband sampling module.
9. The delayed sampling device according to claim 8, characterized in that, The reference signal is in phase with the sampling clock signal; the period of the reference signal is greater than the maximum value of the time delay error between different narrowband signals; the delay time of the delay control signal is an integer multiple of the period of the reference signal.
10. The time-delay sampling device according to claim 9, characterized in that, The sampling output module includes a channel calibration parameter extraction module, a channel decomposition module, N upsampling processing modules, N calibration processing modules, N frequency shifting processing modules, and a frequency splicing module. The channel calibration parameter extraction module is used to extract the sampled signal of the reference signal in each channel signal from the narrowband sampled signal sequence; compare the phase difference between the reference signals of different channels to generate a delay calibration signal representing the channel delay, and output it to the corresponding calibration processing module; The channel decomposition module is used to decompose the narrowband sampled signal sequence into N channels according to the time sequence and output them to N upsampling processing modules; the N upsampling processing modules, N calibration processing modules and N frequency shift processing modules are connected in sequence accordingly; Each of the upsampling processing modules is used to upsample the input narrowband sampled signal and then output it to the corresponding calibration processing module. Each of the calibration processing modules is used to calibrate the upsampled signal of each channel with the input delay calibration signal, and then output it to the corresponding frequency shift processing module. Each of the frequency shift processing modules is used to perform frequency shift processing on the calibrated sampled signal and then output it to the frequency splicing module; the frequency shift processing maps the frequency range of each channel sampled signal to the frequency band corresponding to the broadband signal before decomposition. The frequency splicing module is used to splice and synthesize the frequency-shifted sampled signals of each channel to obtain a broadband sampled signal.