CN103634006A - Rapid mixed sampling method for ultra wide band signal - Google Patents

Rapid mixed sampling method for ultra wide band signal Download PDF

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Publication number
CN103634006A
CN103634006A CN201310154204.6A CN201310154204A CN103634006A CN 103634006 A CN103634006 A CN 103634006A CN 201310154204 A CN201310154204 A CN 201310154204A CN 103634006 A CN103634006 A CN 103634006A
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sampling
frequency
sampling frequency
ultra
real
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CN201310154204.6A
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张群英
王伟
方广有
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Institute of Electronics of CAS
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Institute of Electronics of CAS
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Abstract

The invention discloses a rapid mixed sampling method for ultra wide band signals. The method comprises: setting real-time sampling frequency of periodic ultra wide band signals, so as to form non-integral multiple frequency difference of the real-time sampling frequency and repetition frequency of the ultra wide band signal; using the real-time sampling frequency to sample a plurality of repetition periods of the periodic ultra wide band signals; and rearranging acquired sampling points to obtain a sample sequence which is sampled by a preset sampling frequency. The sampling method solves problems that an existing equivalent sampling method is low in sampling efficiency and needs a specific time-delay circuit and time delay is not accurate. Under a condition that the specific time-delay circuit is not needed, sampling efficiency is improved, sampling errors are reduced, and meanwhile complexity of hardware system design is reduced, so that system debugging is convenient.

Description

A kind of rapid mixing method of sampling of ultra-broadband signal
Technical field
The present invention relates to ultra-wideband microwave Detection Techniques field, especially a kind of rapid mixing method of sampling of ultra-broadband signal.
Background technology
Ultra-broadband signal is because its high-resolution is in the extensive use of microwave sounding technical field, and in these systems, signal bandwidth often reaches 1GHz and even counts GHz, the sampling of ultra-broadband signal more and more become to one of key issue that radio ultra wide band system need to solve.Therefore according to nyquist sampling theorem, sample frequency is at least greater than the twice that is sampled signal bandwidth, is that 1GHz even counts the ultra-broadband signal of GHz for signal bandwidth, and the sample frequency needing will be up to several GHz tens GHz even.So the sampling A/D chip price of high sampling rate is very expensive, even cannot obtain.
At present, the general method of equivalent sampling that adopts solves this problem, equivalent sampling is a kind of transformed samples, the periodicity of sampled signal or the feature of quasi periodicity are treated in its utilization, within each monocycle for the treatment of sampled signal appearance, only once sample, after a plurality of repetition periods of signal, just can obtain all samples of waveform in reconstruction signal one-period.Its detailed process is: signal is the cycle or quasi-periodic, within the single cycle, only obtain a sampling, in two adjacent cycles, sampling increases an equivalent stepping relatively constantly, after last periodic sampling, accumulation stepping is made zero and is started next round signal sampling.Equivalence sampler, with respect to real time sample system, need to increase the delay circuit of accurate little stepping.
In application, there is following problem in current equivalent sampling method:
1, sampling efficiency is low.Because each signal period only once samples, obtaining a complete sampled data of signal period need to could obtain after the sampling of a plurality of repetition periods, sampling efficiency lowly cannot meet even engineering application, especially for the ULTRA-WIDEBAND RADAR of coding system, code length is longer, sampling number is more, and the time that completes complete sampled data of signal period is just longer.
2, need to increase the delay circuit of little stepping.Current equivalent sampling method need to collect different sampled points to realize the different signal periods to the continuous time delay of sampling clock, therefore must increase delay circuit.
3, time delay is inaccurate.The accuracy of delay circuit time delay and precision are key factors that guarantees signal sampling quality, at present conventional delay circuit adopts Special time delay chip to realize, exist delay chip delay precision delay unit amount inadequate and different delayed time chip to have deviation, this will cause time delay inaccurate, sampling error strengthens, affect the sampling quality of signal, and then affect the certainty of measurement of radio ultra wide band system.
For the problems referred to above, the present invention proposes a kind of rapid mixing method of sampling, in the problem that is even difficult to obtain in solution high-speed sampling chip price costliness, solved the problem that existing equivalent sampling method exists, on the basis that does not increase Special time delay circuit, improved sampling efficiency, reduce sampling error, reduced the complexity of system simultaneously.
Summary of the invention
The object of the invention is to overcome the problem that prior art exists, propose a kind of rapid mixing method of sampling of ultra-broadband signal, when not needing Special time delay circuit, improved sampling efficiency, reduced the Acquisition Error of ultra-broadband signal.The employing of the method not only can reduce the complexity of hardware system development, improves the stability of system, makes the realization of overlength coding system ULTRA-WIDEBAND RADAR become possibility simultaneously.
For achieving the above object, the present invention proposes a kind of rapid mixing method of sampling of ultra-broadband signal, and the method comprises the following steps:
Step 1, determines predetermined sample frequency fs;
Step 2, according to the repetition period T of ultra-broadband signal and predetermined sample frequency fs, determines while sampling according to predetermined sampling frequency fs the sampling number N gathering in one-period;
Step 3, determines reduce sampling frequency M, wherein, and M < N, and the greatest common divisor of M and N is 1;
Step 4, according to predetermined sampling frequency fs and reduce sampling frequency M, determines real-time sampling frequency f r;
Step 5, is used the definite real-time sampling frequency f r of described step 4 to sample to the M of a periodicity ultra-broadband signal repetition period, completes the data acquisition of one-period;
Step 6, to the N of the one-period a collecting sampled point according to sampling sequencing with the form of footnote, indicate its sequence number, wherein, footnote be 1, M+1,2M+1 ... (N-1) M+1}, sample sequence can be expressed as { a 1, a m+1, a 2M+1... a (N-1) M+1;
Step 7, to completing the footnote of N sampled point of sequence number mark in described step 6, carries out N to ask mould, and the scope that makes footnote is 1～N, and described sample sequence is expressed as { a 1, a m+1... a n-M+1;
Step 8, re-starts arrangement according to sampled point footnote order from small to large in described step 7 to a described N sampled point, obtains needed according to the sample sequence { a after predetermined sampling frequency fs sampling 1, a 2, a 3... a n.
The invention has the beneficial effects as follows: pass through algorithm design, make to form between real-time sampling frequency and the repetition rate of ultra-broadband signal the difference on the frequency of a non-integer multiple, thereby reach a kind of delay effect, realized and mixed sampling, reduced sample rate, reduce the use of high-speed sampling chip, reduced the use of delay circuit simultaneously, when improving sampling efficiency and sampling precision, simplified circuit design.Can improve sampling precision by the stability of assurance reference clock, more convenient in implementation method.
Accompanying drawing explanation
Fig. 1 is the flow chart of the ultra-broadband signal rapid mixing method of sampling of the present invention.
Fig. 2 is the signal that the cycle is equaled to 10, and adopting the inventive method to realize reduce sampling frequency is 3 sampling flow process.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Before the present invention is introduced further, first do following setting:
Signal S is one-period m sequential coding signal, and code length is 511, and bandwidth is B=1.6GHz, and centre frequency is 1.6GHz, repetition period T=638.75ns.
Fig. 1 is the periodically flow chart of the ultra-broadband signal rapid mixing method of sampling of the present invention, in conjunction with specific embodiments, said method comprising the steps of:
Step 1, determines predetermined sample frequency fs;
It is T that Fig. 1 (a) is depicted as the repetition period, repetition rate f=I/T, the ultra-broadband signal that bandwidth is B; According to nyquist sampling theorem, require sample frequency fs to be at least greater than the twice that is sampled signal bandwidth, in this embodiment, require fs > 3.2GHz, in this step, predetermined sampling frequency is chosen for fs=6.4GHz;
Step 2, according to the repetition period T of ultra-broadband signal and predetermined sample frequency fs, determines while sampling according to predetermined sampling frequency fs the sampling number N gathering in one-period;
In this step, the sampling number N that should gather in one-period is: N=T * fs=638.75 * 6.4=4088, as shown in Fig. 1 (b);
Step 3, determines reduce sampling frequency M according to the requirement of system, wherein, and M < N, and the greatest common divisor of M and N is 1, in this step, chooses M=25;
Step 4, according to predetermined sampling frequency fs and reduce sampling frequency M, determines real-time sampling frequency f r, wherein, and fr=fs/M=6.4GHz/25=256MHz;
In this step, if the fr calculating is difficult to realize in engineering, turn back to described step 1, the numerical value of predetermined sampling frequency fs is finely tuned.
Described real-time sampling frequency f r and signal repetition rate f are non-integer multiple relations, thereby while making with real-time sampling frequency f r, signal to be sampled, every process one-period will produce a time difference, and this difference is that real-time sampling frequency f r can collect the assurance of ordering according to all N of predetermined sampling rate fs sampling after M signal period.
Step 5, is used the definite real-time sampling frequency f r of described step 4 to sample to the M of a periodicity ultra-broadband signal repetition period, completes the data acquisition of one-period;
During sampling, use described real-time sampling frequency f r=256MHz that periodicity ultra-broadband signal is sampled and kept and analog-to-digital conversion ADC, through M sampling, obtain the data acquisition that completes one-period after N=4088 sampled point, sampling time is M * T, sampling number is N, as shown in Fig. 1 (c);
The repetition rate f of described real-time sampling frequency f r and described ultra-broadband signal is that same reference signal source produces, and has very high clock stability, to guarantee accuracy and the precision of time delay.
Step 6, to the N of the one-period a collecting sampled point according to sampling sequencing with the form of footnote, indicate its sequence number, wherein, footnote be 1, M+1,2M+1 ... (N-1) M+1}, sample sequence can be expressed as { a 1, a m+1, a 2M+1... a (N-1) M+1, in one embodiment, N=4088, M=25, footnote be 1,26,41 ... 102176};
Step 7, to completing the footnote of N sampled point of sequence number mark in described step 6, carries out N to ask mould, and the scope that makes footnote is 1～N, and sample sequence just can be expressed as { a like this 1, a m+1... a n-M+1, in one embodiment, N=4088, M=25, sample sequence is { a 1, a 26, a 41... a 4064;
Step 8, re-starts arrangement according to sampled point footnote order from small to large in described step 7 to a described N sampled point, can obtain needed according to the sample sequence { a after predetermined sampling frequency fs=6.4GHz sampling 1, a 2, a 3... a n, as shown in Fig. 1 (d), in one embodiment, N=4088, described sample sequence is { a 1, a 2, a 3... a 4088.
In order to be easier to understand the sampling process of the rapid mixing method of sampling proposed by the invention, below in conjunction with Fig. 2, the periodic signal to N=10, when reduce sampling frequency M=3, the flow process that adopts the rapid mixing method of sampling of the present invention to sample describes.Fig. 2 (a) is depicted as a periodic signal according to the predetermined rear sample sequence forming of sample frequency fs sampling, reduce sampling frequency M=3, the sampled point of arrow place for sampling according to real-time sampling rate fr in figure, be about to predetermined sample rate f s and reduced by 3 times, from Fig. 2 (a), can find out, this periodic signal is according to the sampling number N=10 in the predetermined rear one-period of sample frequency fs sampling; The sample sequence of Fig. 2 (b) for obtaining after sampling according to the rapid mixing method of sampling of the present invention's proposition; Fig. 2 (c) is the sample sequence after the sample sequence of Fig. 2 (b) is rearranged, from Fig. 2 (c), can find out, process is to the periodic signal sampling of 3 repetition periods, and the present invention has reached the result that this signal is sampled according to predetermined sampling rate fs.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (8)

1. a rapid mixing method of sampling for periodicity ultra-broadband signal, is characterized in that, the method comprises the following steps:
Step 1, determines predetermined sample frequency fs;
Step 2, according to the repetition period T of ultra-broadband signal and predetermined sample frequency fs, determines while sampling according to predetermined sampling frequency fs the sampling number N gathering in one-period;
Step 3, determines reduce sampling frequency M, wherein, and M < N, and the greatest common divisor of M and N is 1;
Step 4, according to predetermined sampling frequency fs and reduce sampling frequency M, determines real-time sampling frequency f r;
Step 5, is used the definite real-time sampling frequency f r of described step 4 to sample to the M of a periodicity ultra-broadband signal repetition period, completes the data acquisition of one-period;
Step 6, to the N of the one-period a collecting sampled point according to sampling sequencing with the form of footnote, indicate its sequence number, wherein, footnote be 1, M+1,2M+1 ... (N-1) M+1}, sample sequence can be expressed as { a 1, a m+1, a 2M+1... a (N-1) M+1;
Step 7, to completing the footnote of N sampled point of sequence number mark in described step 6, carries out N to ask mould, and the scope that makes footnote is 1～N, and described sample sequence is expressed as { a 1, a m+1... a n-M+1;
Step 8, re-starts arrangement according to sampled point footnote order from small to large in described step 7 to a described N sampled point, obtains needed according to the sample sequence { a after predetermined sampling frequency fs sampling 1, a 2, a 3... a n.
2. method according to claim 1, is characterized in that, described predetermined sample frequency fs is at least greater than the twice that is sampled signal bandwidth.
3. method according to claim 1, is characterized in that, sampling number N is: N=T * fs.
4. method according to claim 1, is characterized in that, described real-time sampling frequency f r is: fr=fs/M.
5. method according to claim 1, is characterized in that, the repetition rate f of described real-time sampling frequency f r and described ultra-broadband signal is non-integer multiple relation.
6. method according to claim 1, is characterized in that, if the described real-time sampling frequency f r calculating is difficult to realize in engineering, is back to described step 1, and the numerical value of described predetermined sample frequency fs is finely tuned.
7. method according to claim 1, is characterized in that, in described step 5, during sampling, uses described real-time sampling frequency f r that periodicity ultra-broadband signal is sampled and kept and analog-to-digital conversion.
8. method according to claim 1, is characterized in that, the repetition rate f of described real-time sampling frequency f r and described ultra-broadband signal is that same reference signal source produces, and has very high clock stability.
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CN104224188A (en) * 2014-09-23 2014-12-24 中国科学院电子学研究所 Feeble respiration signal detection method used for life detection radar
CN104407538A (en) * 2014-10-20 2015-03-11 中国电子科技集团公司第四十一研究所 Novel vector network analyzer signal generation and acquisition method
CN107831476A (en) * 2017-10-13 2018-03-23 中国科学院电子学研究所 The device and method of the down-sampled rate of radar signal
CN110945322A (en) * 2017-07-25 2020-03-31 罗伯特·博世有限公司 Method and sensor system for processing continuous sensor signals
CN111947713A (en) * 2020-08-05 2020-11-17 深圳威迈斯新能源股份有限公司 Sampling method and system
CN113032461A (en) * 2021-03-25 2021-06-25 广州虎牙科技有限公司 Time series data processing method, time series data processing device and storage medium
CN114243889A (en) * 2021-12-28 2022-03-25 深圳市伊力科电源有限公司 Uninterruptible power supply load adaptability regulation control method and system

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CN101581781A (en) * 2009-05-23 2009-11-18 桂林电子科技大学 Method and device for receiving pulse ultra-wideband radar signal
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US20050083199A1 (en) * 2000-09-14 2005-04-21 Hall David J. System and method for detecting an intruder using impulse radio technology
CN101216511A (en) * 2008-01-18 2008-07-09 杭州万工科技有限公司 Digital synchronous sampling method
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Cited By (11)

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Publication number Priority date Publication date Assignee Title
CN104224188A (en) * 2014-09-23 2014-12-24 中国科学院电子学研究所 Feeble respiration signal detection method used for life detection radar
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CN104407538A (en) * 2014-10-20 2015-03-11 中国电子科技集团公司第四十一研究所 Novel vector network analyzer signal generation and acquisition method
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CN110945322A (en) * 2017-07-25 2020-03-31 罗伯特·博世有限公司 Method and sensor system for processing continuous sensor signals
CN110945322B (en) * 2017-07-25 2022-05-17 罗伯特·博世有限公司 Method and sensor system for processing continuous sensor signals
CN107831476A (en) * 2017-10-13 2018-03-23 中国科学院电子学研究所 The device and method of the down-sampled rate of radar signal
CN111947713A (en) * 2020-08-05 2020-11-17 深圳威迈斯新能源股份有限公司 Sampling method and system
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CN113032461A (en) * 2021-03-25 2021-06-25 广州虎牙科技有限公司 Time series data processing method, time series data processing device and storage medium
CN114243889A (en) * 2021-12-28 2022-03-25 深圳市伊力科电源有限公司 Uninterruptible power supply load adaptability regulation control method and system

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Application publication date: 20140312