CN115603749A - Time delay sampling method and device for broadband radio frequency signal - Google Patents
Time delay sampling method and device for broadband radio frequency signal Download PDFInfo
- Publication number
- CN115603749A CN115603749A CN202211340639.5A CN202211340639A CN115603749A CN 115603749 A CN115603749 A CN 115603749A CN 202211340639 A CN202211340639 A CN 202211340639A CN 115603749 A CN115603749 A CN 115603749A
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- radio frequency
- sampling
- delay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The invention relates to a receiving and sampling device for delayed sampling, which comprises: the device comprises a wide-narrow band conversion module, a frequency conversion module and an analog-to-digital conversion module; the wide-narrow band conversion module is used for converting an input wide band radio frequency signal into a delay combination signal of a plurality of paths of narrow band radio frequency signals which are output in series, have different frequency bands and are mixed with reference signals; the frequency conversion module is used for respectively carrying out frequency conversion on the multi-path narrow-band radio frequency combining signals to obtain serially-output frequency-reducing signals with the same frequency band range; the analog-to-digital conversion module is used for sampling the frequency reduction signal to obtain a digital sampling signal; the digital sampling signal comprises a sampling narrowband signal of each path of narrowband radio frequency signal and a sampling reference signal of a corresponding reference signal. The invention reduces the requirement on the sampling frequency of the sampling device on the premise of adopting a single channel to realize a broadband receiving sampling system.
Description
Technical Field
The invention belongs to the technical field of digital signal processing, and particularly relates to a time delay sampling method and a time delay sampling device for broadband radio frequency signals.
Background
When an analog signal is digitized, analog-to-digital conversion needs to be performed through sampling and quantization, wherein sampling refers to taking values of a continuous time signal at time intervals to convert the continuous time signal into a discrete time signal.
If a real continuous signal is of limited bandwidth, the continuous-time signal can be uniquely determined from the sampled discrete signal when the sampling frequency is greater than 2 times the signal bandwidth, according to the sampling theorem which determines the relationship between the sampling frequency and the real continuous signal bandwidth.
The technical difficulty in realizing the digitization of the broadband signals is very high, and the digitization is limited by the performance of related devices such as high-speed analog-to-digital conversion. Therefore, in practical engineering implementation, if a single device cannot meet the requirement of broadband sampling, a multi-channel scheme is usually adopted for implementation, that is, a broadband signal is decomposed into a plurality of narrowband signals, each narrowband signal is digitized by using narrow signal channels of the plurality of channels and low-speed analog-to-digital conversion, and then the broadband sampling signal is obtained through signal processing. This approach of using multiple channels to implement wideband signal sampling increases the complexity and cost of system implementation.
Accordingly, there is a need in the art for a signal receiving sampling arrangement that utilizes single-channel, low-speed sampling to achieve the digitization of a wideband signal.
Disclosure of Invention
In view of the foregoing analysis, the present invention aims to disclose a receiving and sampling apparatus for delay sampling, which can overcome the same disadvantages of the conventional broadband receiving and sampling system, and reduce the requirement on the sampling frequency of the sampling device on the premise of implementing the broadband receiving and sampling system by using a single channel.
The invention discloses a receiving and sampling device for time delay sampling, which comprises: the device comprises a wide-narrow band conversion module, a frequency conversion module and an analog-to-digital conversion module;
the wide-narrow band conversion module is used for converting an input wide band radio frequency signal into a delay combination signal of a plurality of paths of narrow band radio frequency signals which are output in series, have different frequency bands and are mixed with reference signals;
the output time of the delay combined signals of each path is not overlapped; the total frequency band of the multi-path narrow-band radio frequency signals covers the frequency band of the broadband radio frequency signals; and the phase of the reference signal mixed in each path of combined signal is related to the output time of the path of signal;
the frequency conversion module is used for respectively carrying out frequency conversion on the multi-path narrow-band radio frequency combining signals to obtain serially-output frequency-reducing signals with the same frequency range;
the down-conversion signal is used for sampling to obtain a digital sampling signal;
the digital sampling signals comprise sampling narrowband signals of each path of narrowband radio frequency signals and sampling reference signals of corresponding reference signals; the multipath sampling narrowband signals form a receiving sampling signal of the broadband radio frequency signal; the phase deviation of the sampling reference signal is the output delay error of the narrow-band sampling signal.
Further, the wide-narrow band conversion module comprises a band decomposition module, a combiner group, a delay group and a first radio frequency selection switch;
the frequency band decomposition module is used for carrying out frequency band decomposition on the broadband radio frequency signal to obtain N paths of parallel narrow-band radio frequency signals; n is more than or equal to 2;
the combiner group comprises N combiners, each combiner inputs a narrow-band radio frequency signal and a reference signal corresponding to one path, and outputs a narrow-band radio frequency combined signal after signal combination;
the time delay unit group comprises N time delay units with different delay times, and each time delay unit inputs a narrow-band radio frequency combined signal for time delay and outputs a delayed combined signal; n delayers output N paths of delay combined signals with different delay times;
the first radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of delay combination signals; when any one path of delay combined signal reaches the controlled switch, the controlled switch connects the corresponding input end and output end of the path under the control of the control signal, and outputs the path of delay combined signal.
Further, the frequency conversion module comprises a down converter and a demodulator;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the intermediate frequency signals after down-conversion comprise intermediate frequency signals of narrow-band radio frequency signals and intermediate frequency signals of reference signals;
the demodulator is used for demodulating the input intermediate frequency signal by adopting a demodulation reference frequency to obtain a baseband signal; the baseband signal comprises a baseband signal of a narrowband radio frequency signal and a baseband signal of a reference signal.
Further, the device also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, N paths of reference frequency signals for the down converter, demodulation reference signals for the demodulator, a sampling clock for the analog-to-digital conversion module and a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the sampling start-stop time of the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
Further, the frequency conversion module is a down converter;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the down-converted intermediate frequency signal comprises an intermediate frequency signal of the narrowband radio frequency signal and an intermediate frequency signal of the reference signal.
Further, the device also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the down converter, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
Further, the frequency translation module includes a demodulator;
the demodulator is connected with the first radio frequency selection switch, and when one path of delay combined signal is received, the reference frequency signal corresponding to the delay combined signal is adopted to demodulate the delay combined signal to obtain a baseband signal;
the reference frequency signal corresponding to each path of delay combined signal and the path of delay combined signal arrive at the demodulator simultaneously; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency of the narrow-band radio frequency signal in the path of signal; the demodulated baseband signal includes a baseband signal of the narrowband radio frequency signal and a baseband signal of the reference signal.
Furthermore, the radio frequency identification device also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the demodulator, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated by the first radio frequency selection switch to reach the demodulator, under the control of the control signal, the second radio frequency selection switch connects the input end and the output end of the reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the demodulator;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
Further, the frequency of each reference signal is not within the frequency band of the narrowband radio frequency signal combined with it, and all reference signals are coherent with the reference frequency signal and the sampling clock signal.
Furthermore, the N delayers in the delayer group are optical fiber delay lines or radio frequency delay lines.
The invention can realize at least the following beneficial effects:
the receiving and sampling device for time delay sampling disclosed by the invention realizes the receiving and sampling of broadband signals by using a single-channel narrow-band analog-to-digital converter for sampling, and has a simple structure, thereby solving the problem of system complexity caused by realizing the sampling of the broadband signals by a multi-channel scheme; moreover, the broadband signal sampling is realized by using low-speed sampling, and the problem that the broadband signal channel and high-speed sampling are difficult to realize by using the broadband signal sampling is solved; meanwhile, the sampling reference signal is mixed with the narrowband radio frequency signal to carry out time delay and sampling together, the phase deviation of the sampling reference signal is the output time delay error of the narrowband sampling signal, and the narrowband sampling signal is subjected to time delay adjustment according to the time delay error to realize accurate alignment.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
Fig. 1 is a schematic block diagram of a delay sampling receiving and sampling apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a wideband-to-narrowband conversion module in an embodiment of the invention;
fig. 3 is a schematic block diagram of a delay sampling receiving and sampling apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a delayed sampling receiver according to an embodiment of the present invention
Fig. 5 is a schematic block diagram of a delay sampling receiving and sampling apparatus according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The embodiment of the invention discloses a receiving and sampling device for delayed sampling, which comprises the following components as shown in figure 1: the device comprises a wide-narrow band conversion module, a frequency conversion module, an analog-to-digital conversion module and a data cache module;
the wide-narrow band conversion module is used for converting an input wide band radio frequency signal into a delay combination signal of a plurality of paths of narrow band radio frequency signals which are output in series, have different frequency bands and are mixed with reference signals;
the output time of the delay combined signals of each path is not overlapped; the total frequency band of the multi-channel narrow-band radio frequency signals covers the frequency band of the broadband radio frequency signals; and the phase of the reference signal mixed in each combined signal is time-dependent on the output of that signal.
And the frequency conversion module is used for respectively carrying out frequency conversion on the multi-path narrow-band radio frequency combining signals to obtain serially-output frequency-reduced signals with the same frequency range.
And the analog-to-digital conversion module is used for sampling the frequency reduction signal to obtain a digital sampling signal.
The digital sampling signals comprise sampling narrowband signals of each path of narrowband radio frequency signals and sampling reference signals of corresponding reference signals; the multi-path sampling narrow-band signals form receiving sampling signals of the broadband radio-frequency signals; the phase deviation of the sampling reference signal is the output delay error of the narrow-band sampling signal.
The data caching module is used for caching the sampling narrowband signal of each path of narrowband radio frequency signal output by the analog-to-digital converter and the sampling reference signal of the corresponding reference signal in the corresponding storage space respectively.
The data caching module is used for caching the digital signal after sampling each path of narrow-band radio frequency signal output by the analog-to-digital converter and the digital signal after sampling the corresponding reference signal in the corresponding storage space respectively.
In the scheme of this embodiment, when performing the wideband-narrowband conversion, the wideband-narrowband conversion module performs band decomposition on the wideband radio frequency signal to obtain a plurality of parallel narrowband radio frequency signals, and performs delay respectively to obtain a plurality of non-overlapping output time narrowband radio frequency signals;
the influence of delay errors of each path on signal sampling is considered when the parallel multi-path narrow-band signals are respectively subjected to delay processing. Therefore, in this embodiment, before performing the delay processing, the reference signals respectively corresponding to each of the narrowband radio frequency signals are mixed to obtain a combined signal;
after the mixed signal is sampled, the sampling signal of the reference signal is extracted from the sampling signal of the mixed signal, the delay error of the sampling signal of the reference signal among the channels is calculated, and the sampling signal can be used as the delay calibration signal of each channel and used for the delay error calibration of the narrow-band sampling signal of each channel.
As shown in fig. 2, the wide-narrow band converting module includes a band splitting module, a combiner group, a delay group, and a first rf selecting switch;
the frequency band decomposition module is used for carrying out frequency band decomposition on the broadband radio-frequency signal to obtain N paths of parallel narrow-band radio-frequency signals; n is more than or equal to 2;
when performing band decomposition, each narrow-band signal is obtained by performing signal frequency shift and low-pass filtering processing on a wide-band continuous signal.
And the frequency band parts between the narrow-band signals of the adjacent frequency bands can be overlapped or not overlapped, the partial overlapping or the non-overlapping is determined based on the characteristics of the transition band of the filter, and the frequency band of splicing and synthesizing all the adjacent narrow-band signals can at least cover the whole frequency range of the broadband radio frequency signal.
In a more specific scheme, a broadband radio frequency signal is decomposed to form N narrowband signals, N narrowband band-pass filters with adjacent or crossed passbands are respectively adopted to filter a broadband continuous signal to obtain N narrowband signals with adjacent or partially overlapped frequency bands, and then frequency shift is performed on different narrowband signals to obtain N parallel narrowband signals corresponding to different frequency bands.
In another more specific scheme, the wideband radio frequency signal is directly divided into wideband continuous signals of N channels, then the signals of each channel are respectively subjected to frequency shift, and then the signals of each channel are subjected to low-pass filtering to obtain N parallel narrowband signals corresponding to different frequency bands.
The combiner group comprises N combiners, and each combiner outputs a narrow-band radio frequency combined signal after combining the input narrow-band radio frequency signal and a reference signal corresponding to one path of signals;
that is, the narrowband rf signal 1 input into the combiner 1 is combined with the reference signal 1, the narrowband rf signal 2 input into the combiner 2 is combined with the reference signal 2, … …, and the narrowband rf signal N input into the combiner N is combined with the reference signal N.
The time delay unit group comprises N time delay units with different delay times, and each time delay unit inputs a narrow-band radio frequency combined signal for time delay and outputs a delayed combined signal; n delayers output N paths of delay combined signals with different delay times;
specifically, different delays are adopted for different narrowband radio frequency combining signals, the delay of each narrowband radio frequency combining signal is different, and when the delay operation is carried out, the relative delay amount between the narrowband radio frequency combining signals of adjacent frequency bands is larger than or equal to the sampling time required for sampling the broadband radio frequency signals.
For example, the bandwidth of the sampled wideband RF signal is B, and the time width is T s The sampling time of the corresponding sampled broadband radio frequency signal is T f (T f ≥T s ) Assuming that the sampled wideband radio frequency signal is divided into N narrowband signals for sampling, the sampling time of each narrowband signal is T f_s Then at each narrowband signal sample, T is required f_s ≥T s Total sampling time is not less than NxT f_s From which samples of the N narrowband signals may be formed distributed in time.
Based on this, when the delay unit group performs the delay operation, the N narrowband signals respectively correspond to N different delays, that is, the delay of the 1 st narrowband signal by the delay unit 1 is 0, and the delay of the 2 nd narrowband signal by the delay unit 2 is T f_s … …, the delay of the N-th narrow-band signal by the delay unit N is (N-1) x T f_s (ii) a In a preferred embodiment, the delay time is an integer multiple of the period of the reference signal.
And the N delayers in the delayer group are optical fiber delay lines or a plurality of radio frequency delay lines with different delay times.
The first radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of delay combination signals; when any one path of delay combined signal reaches the controlled switch, the controlled switch connects the corresponding input end and output end of the path under the control of the control signal, and outputs the path of delay combined signal. And each path of delay combination signal is output to the frequency conversion module according to the sequence of the delay length by controlling the turn-on time sequence of the first radio frequency selection switch.
Specifically, the N reference signals are coherent signals, the frequency of each reference signal is not within the frequency band range of the narrowband radio frequency signal combined with the reference signal, and all the reference signals are coherent with the reference frequency signal used for down-conversion or demodulation in the frequency conversion module and the sampling clock signal of the digital-to-analog conversion module. The phase change of the reference signal can be preserved during down-conversion or demodulation and sampling through frequency coherence, so that a delay error is obtained.
As shown in fig. 3, in an aspect of the present embodiment, the frequency conversion module includes a down converter and a demodulator;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the intermediate frequency signals after down-conversion comprise intermediate frequency signals of narrow-band radio frequency signals and intermediate frequency signals of reference signals;
the demodulator is used for demodulating the input intermediate frequency signal by adopting a demodulation reference frequency to obtain a baseband signal; the baseband signals comprise baseband signals of narrowband radio frequency signals and baseband signals of reference signals;
the digital-to-analog converter included in the analog-to-digital conversion module is a low-speed analog-to-digital converter;
in a specific scheme, an analog-to-digital converter in the analog-to-digital conversion module samples a baseband signal output by the demodulator through a sampling clock to obtain a digital signal of the baseband signal. The digital signal of the baseband signal comprises a digital signal of a narrowband radio frequency signal and a digital signal of a reference signal.
And in the data caching module, caching the digital signal of each baseband signal output by the analog-to-digital conversion module in a corresponding storage space.
In another optional specific solution, the analog-to-digital conversion module includes a first digital-to-analog converter and a second digital-to-analog converter;
the first digital-to-analog converter samples a baseband signal of the narrowband radio-frequency signal through a sampling clock signal to obtain a digital signal of the narrowband radio-frequency signal;
and the second digital-to-analog converter samples the baseband signal of the reference signal through the sampling clock signal to obtain the digital signal of the reference signal.
In the data caching module, the digital signal after sampling of each path of narrow-band radio frequency signal output by the analog-to-digital converter and the digital signal after sampling of the corresponding reference signal are respectively cached in the corresponding storage spaces.
The receiving and sampling device of the scheme also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, N paths of reference frequency signals for the down converter, demodulation reference signals for the demodulator, a sampling clock for the analog-to-digital conversion module and a control time reference signal for the controller;
the frequency of each reference signal is not within the frequency band of the narrowband radio frequency signal combined with the reference signal, and all the reference signals are coherent with the reference frequency signal and the sampling clock signal.
Further, the reference frequency of the frequency source output to the N paths of the down converter corresponds to the center frequency of the narrow-band radio frequency signal in the output signal of the first radio frequency selection switch, and the reference frequency output to the demodulator is fixed. Or the reference frequency output to the demodulator is controllable, corresponding to the central frequency of the narrow-band radio frequency signal in the output signal of the first radio frequency selective switch, and the reference frequency output to the down converter is fixed.
The second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the sampling start-stop time of the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
As shown in fig. 4, in an aspect of this embodiment, the frequency conversion module is a down converter;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the intermediate frequency signals after down-conversion comprise intermediate frequency signals of narrow-band radio frequency signals and intermediate frequency signals of reference signals;
the digital-to-analog converter included in the analog-to-digital conversion module is a low-speed analog-to-digital converter;
in a specific scheme, an analog-to-digital converter in the analog-to-digital conversion module samples an intermediate frequency signal output by the down converter through a sampling clock to obtain a digital signal of the intermediate frequency signal. The digital signal of the intermediate frequency signal comprises a digital signal of a narrowband radio frequency signal and a digital signal of a reference signal.
And in the data caching module, caching the digital signal of each path of intermediate frequency signal output by the analog-to-digital conversion module in a corresponding storage space.
In another specific alternative, the analog-to-digital conversion module includes a first digital-to-analog converter and a second digital-to-analog converter;
the first digital-to-analog converter samples the intermediate frequency signal of the narrow-band radio frequency signal through the sampling clock signal to obtain a digital signal of the narrow-band radio frequency signal;
and the second digital-to-analog converter samples the intermediate frequency signal of the reference signal through the sampling clock signal to obtain the digital signal of the reference signal.
In the data caching module, the digital signal sampled by each path of narrow-band radio-frequency signal output by the analog-to-digital conversion module and the digital signal sampled by the corresponding reference signal are respectively cached in the corresponding storage spaces.
The receiving and sampling device of the scheme also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the down converter, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the frequency of each reference signal is not within the frequency band of the narrowband radio frequency signal combined with the reference signal, and all the reference signals are coherent with the reference frequency signal and the sampling clock signal.
Further, the reference frequency of the frequency source output to the down converter is controllable, and corresponds to the center frequency of the narrowband radio frequency signal in the output signal of the first radio frequency selective switch.
The second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
As shown in fig. 5, in an aspect of the present embodiment, the frequency conversion module includes a demodulator;
the demodulator is connected with the first radio frequency selection switch, and when one path of delay combined signal is received, the reference frequency signal corresponding to the delay combined signal is adopted to demodulate the delay combined signal to obtain a baseband signal;
the reference frequency signal corresponding to each path of delay combined signal and the path of delay combined signal arrive at the demodulator simultaneously; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency of the narrow-band radio frequency signal in the path of signal; the demodulated baseband signals comprise baseband signals of narrowband radio frequency signals and baseband signals of reference signals;
the digital-to-analog converter included in the analog-to-digital conversion module is a low-speed analog-to-digital converter;
in a specific scheme, an analog-to-digital converter in the analog-to-digital conversion module samples a baseband signal output by the demodulator through a sampling clock to obtain a digital signal of the baseband signal. The digital signal of the baseband signal comprises a digital signal of a narrowband radio frequency signal and a digital signal of a reference signal.
And in the data caching module, caching the digital signal of each baseband signal output by the analog-to-digital conversion module in a corresponding storage space.
In another specific alternative, the analog-to-digital conversion module includes a first digital-to-analog converter and a second digital-to-analog converter;
the analog-to-digital conversion module comprises a first digital-to-analog converter and a second digital-to-analog converter;
the first digital-to-analog converter samples a baseband signal of the narrow-band radio frequency signal through a sampling clock signal to obtain a digital signal of the narrow-band radio frequency signal;
and the second digital-to-analog converter samples the baseband signal of the reference signal through the sampling clock signal to obtain the digital signal of the reference signal.
In the data caching module, the digital signal after sampling of each path of narrow-band radio frequency signal output by the analog-to-digital converter and the digital signal after sampling of the corresponding reference signal are respectively cached in the corresponding storage spaces.
The receiving and sampling device of the scheme also comprises a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the demodulator, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the frequency of each reference signal is not within the frequency band of the narrowband radio frequency signal combined with the reference signal, and all the reference signals are coherent with the reference frequency signal and the sampling clock signal.
Further, the reference frequency of the frequency source output to the demodulator is controllable, and corresponds to the center frequency of the narrow-band radio frequency signal in the first radio frequency selection switch output signal.
The second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated by the first radio frequency selection switch and reaches the demodulator, under the control of the control signal, the second radio frequency selection switch connects the input end and the output end of the reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the demodulator;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
In each scheme in the embodiment according to the present invention, the outputs of the first rf selection switch and the second rf selection switch are in synchronous one-to-one correspondence, that is, when the first rf selection switch selects to output the narrowband rf signal 1, the second rf selection switch selects to output the reference frequency signal 1; when the first radio frequency selection switch selects to output the narrowband radio frequency signal 2, the second radio frequency selection switch selects to output the reference frequency signal 2; … …, and so on, when the first rf selecting switch selects to output the narrowband rf signal N, the second rf selecting switch selects to output the reference frequency signal N.
In summary, in the receiving and sampling device for delayed sampling according to the embodiment of the present invention, the sampling uses a single-channel narrow-band analog-to-digital converter to receive and sample the broadband signal, and the structure is simple, so that the problem of system complexity caused by the implementation of broadband signal sampling in a multi-channel scheme is solved;
moreover, the broadband signal sampling is realized by using low-speed sampling, and the problem that the broadband signal channel and high-speed sampling are difficult to realize by using the broadband signal sampling is solved;
meanwhile, the sampling reference signal and the narrowband radio frequency signal are delayed and sampled together, the phase deviation of the sampling reference signal is the output delay error of the narrowband sampling signal, and the narrowband sampling signal is delayed and adjusted according to the delay error to realize accurate alignment.
While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A delayed sampling receive sampling apparatus, comprising: the device comprises a wide-narrow band conversion module, a frequency conversion module and an analog-to-digital conversion module;
the wide-narrow band conversion module is used for converting an input wide band radio frequency signal into a delay combination signal of a plurality of paths of narrow band radio frequency signals which are output in series, have different frequency bands and are mixed with reference signals;
the output time of the delay combined signals of each path is not overlapped; the total frequency band of the multi-channel narrow-band radio frequency signals covers the frequency band of the broadband radio frequency signals; and the phase of the reference signal mixed in each path of combined signal is related to the output time of the path of signal;
the frequency conversion module is used for respectively carrying out frequency conversion on the multi-path narrow-band radio frequency combining signals to obtain serially-output frequency-reducing signals with the same frequency range;
the analog-to-digital conversion module is used for sampling the frequency reduction signal to obtain a digital sampling signal;
the digital sampling signals comprise sampling narrowband signals of each path of narrowband radio-frequency signals and sampling reference signals of corresponding reference signals; the multipath sampling narrowband signals form a receiving sampling signal of the broadband radio frequency signal; the phase deviation of the sampling reference signal is the output delay error of the narrow-band sampling signal.
2. The device for receiving and sampling with time delay sampling according to claim 1, wherein the wide-narrow band converting module comprises a band splitting module, a combiner group, a time delay group and a first radio frequency selection switch;
the frequency band decomposition module is used for carrying out frequency band decomposition on the broadband radio frequency signal to obtain N paths of parallel narrow-band radio frequency signals; n is more than or equal to 2;
the combiner group comprises N combiners, each combiner inputs a narrow-band radio frequency signal and a reference signal corresponding to one path, and outputs a narrow-band radio frequency combined signal after signal combination;
the time delay unit group comprises N time delay units with different delay times, and each time delay unit inputs a narrow-band radio frequency combined signal for time delay and outputs a delayed combined signal; n delayers output N paths of delay combined signals with different delay times;
the first radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of delay combination signals; when any one path of delay combined signal reaches the controlled switch, the controlled switch connects the corresponding input end and output end of the path under the control of the control signal, and outputs the path of delay combined signal.
3. The device for delayed sampling reception sampling according to claim 2, wherein the frequency conversion module comprises a down converter and a demodulator;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the intermediate frequency signals after down-conversion comprise intermediate frequency signals of narrow-band radio frequency signals and intermediate frequency signals of reference signals;
the demodulator is used for demodulating the input intermediate frequency signal by adopting a demodulation reference frequency to obtain a baseband signal; the baseband signal comprises a baseband signal of a narrowband radio frequency signal and a baseband signal of a reference signal.
4. The delayed sampling receive sampling device of claim 3, further comprising a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, N paths of reference frequency signals for the down converter, demodulation reference signals for the demodulator, a sampling clock for the analog-to-digital conversion module and a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
5. The device for receiving and sampling with time delay sampling according to claim 2, wherein the frequency conversion module is a down converter;
the down converter is connected with the first radio frequency selection switch, and when a path of delay combined signal is received, the down converter adopts a reference frequency signal corresponding to the delay combined signal to perform down conversion on the delay combined signal to obtain an intermediate frequency signal;
the reference frequency signal corresponding to each path of delay combination signal and the path of delay combination signal arrive at the down converter at the same time; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency difference of the narrowband radio frequency signal frequency in the path of signal, and the frequency of the intermediate frequency signal after down-conversion is the same; the down-converted intermediate frequency signal comprises an intermediate frequency signal of the narrowband radio frequency signal and an intermediate frequency signal of the reference signal.
6. The delayed sampling receive sampling device of claim 5, further comprising a frequency source, a second radio frequency selection switch and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the down converter, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated to a down converter by the first radio frequency selection switch, under the control of a control signal, the second radio frequency selection switch connects the input end and the output end of a reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the down converter;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
7. The device for delayed sampling receive sampling of claim 2, wherein the frequency translation module comprises a demodulator;
the demodulator is connected with the first radio frequency selection switch, and when one path of delay combined signal is received, the reference frequency signal corresponding to the delay combined signal is adopted to demodulate the delay combined signal to obtain a baseband signal;
the reference frequency signal corresponding to each path of delay combined signal and the path of delay combined signal arrive at the demodulator simultaneously; the frequency of the reference frequency signal corresponding to each path of delay combination signal is the same as the frequency of the narrow-band radio frequency signal in the path of signal; the demodulated baseband signal includes a baseband signal of the narrowband radio frequency signal and a baseband signal of the reference signal.
8. The delayed sample receive sampling device of claim 7, further comprising a frequency source, a second rf selection switch, and a controller;
the frequency source is used for providing N paths of reference signals for the wide-narrow band conversion module, providing N paths of reference frequency signals for the demodulator, providing a sampling clock for the analog-to-digital conversion module and providing a control time reference signal for the controller;
the second radio frequency selection switch is a controlled switch with 1 selected from N, and N input ends are respectively connected with N paths of reference frequency signals output by the frequency source; the frequency of each path of reference frequency signal corresponds to the frequency of a narrow-band radio frequency signal included in one path of delay combination signal; after one path of delay combined signal is gated by the first radio frequency selection switch to reach the demodulator, under the control of the control signal, the second radio frequency selection switch connects the input end and the output end of the reference frequency signal corresponding to the path of delay combined signal, and outputs the path of reference frequency signal to the demodulator;
the controller is used for controlling the signal output of the first radio frequency selection switch and the second radio frequency selection switch, the reference frequency output of the frequency source, the analog-to-digital conversion module and the sampling start-stop time of the data cache module.
9. The apparatus of claim 1, wherein each reference signal has a frequency that is not within the frequency band of the narrowband radio frequency signal combined with it, and all reference signals are coherent with the reference frequency signal and the sampling clock signal.
10. The delay-sampled reception sampling apparatus of claim 2, wherein the N delayers in the delayer group are optical fiber delay lines or radio frequency delay lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211340639.5A CN115603749A (en) | 2022-10-28 | 2022-10-28 | Time delay sampling method and device for broadband radio frequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211340639.5A CN115603749A (en) | 2022-10-28 | 2022-10-28 | Time delay sampling method and device for broadband radio frequency signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115603749A true CN115603749A (en) | 2023-01-13 |
Family
ID=84850435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211340639.5A Pending CN115603749A (en) | 2022-10-28 | 2022-10-28 | Time delay sampling method and device for broadband radio frequency signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115603749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116365240A (en) * | 2023-05-18 | 2023-06-30 | 天津驭信科技有限公司 | Wide-bandwidth slot antenna |
-
2022
- 2022-10-28 CN CN202211340639.5A patent/CN115603749A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116365240A (en) * | 2023-05-18 | 2023-06-30 | 天津驭信科技有限公司 | Wide-bandwidth slot antenna |
| CN116365240B (en) * | 2023-05-18 | 2023-10-27 | 天津驭信科技有限公司 | Wide-bandwidth slot antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1154589B1 (en) | Multiple branch receiver system and method | |
| US4803700A (en) | Method of, and demodulator for, digitally demodulating an SSB signal | |
| EP1764926B1 (en) | Analog signal processing circuit and communication device therewith | |
| AU756733B2 (en) | A method and apparatus for digital channelisation and de-channelisation | |
| US20070081617A1 (en) | Reconfigurable direct RF bandpass sampling receiver and related methods | |
| WO2007044749A2 (en) | Direct bandpass sampling receivers and related methods | |
| KR101023646B1 (en) | Apparatus and method for processing multi-channel signals and a multi-channel receiver by using the same | |
| US7317935B2 (en) | Radio receiver | |
| US8050639B2 (en) | Multi-antenna communication apparatus | |
| CN115603749A (en) | Time delay sampling method and device for broadband radio frequency signal | |
| US9001932B2 (en) | Method and apparatus for extracting the quadrature component of a complex signal from the in-phase component after baseband digitizing using a complex transform | |
| US9191043B1 (en) | Direct digital RF conversion | |
| EP2109937B1 (en) | A digital multi-channel system for processing radio signals, in particular of the very wide band type | |
| RU2555862C2 (en) | Method for direct signal sampling of multiple radio frequency bands and control unit therefor | |
| US7346136B1 (en) | Rake receiver | |
| JP2000505636A (en) | Selective filtering method for co-channel interference reduction | |
| CN112910475B (en) | Digital receiver for complex signal monitoring | |
| EP0977369A2 (en) | Sampling means for use with rake receiver | |
| US20060215788A1 (en) | Frequency conversion for multi-channels | |
| CN115361037B (en) | Ultra-wideband RAKE receiving method and device under slow fading channel | |
| KR101131221B1 (en) | Receiving system receving radio frequency signal to convert into baseband signal, digital down converter and method of digital down converting | |
| JPS6337538B2 (en) | ||
| CN113114166A (en) | High-speed parallel DDC (direct digital control) and FIR (finite impulse response) filtering processing method based on FPGA (field programmable Gate array) | |
| JPH10215200A (en) | Receiver | |
| CN110113059A (en) | A kind of device and method reducing ADC sampling rate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |