CN108599768A - A kind of data sampling device and method improving antenna snr of received signal - Google Patents
A kind of data sampling device and method improving antenna snr of received signal Download PDFInfo
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- CN108599768A CN108599768A CN201810054538.9A CN201810054538A CN108599768A CN 108599768 A CN108599768 A CN 108599768A CN 201810054538 A CN201810054538 A CN 201810054538A CN 108599768 A CN108599768 A CN 108599768A
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- clock
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- sampling
- received signal
- pulse counter
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Abstract
A kind of data sampling device and method improving antenna snr of received signal of the present invention, including clock generator, L frequency dividers, clock pulse counter, L path multiplexers and ADC devices；The clock pulses that clock generator generates is sent into pulse counter, the output C of pulse counter1,…,CNSelection as multiplexer controls signal, and the clock pulses that clock generator generates also is sent into L frequency dividers；L frequency dividers generation a cycle is sampling clock of the clock signal of L times of counter clock cycle as ADC devices；ADC devices sample the baseband signal of input, an input terminal of output connection multiplexer；The remaining input terminal of multiplexer is grounded, and is exported under the control of the selection control signal, and it is T to realize the periods" L zero of interpolation " discrete series sampling.Under the premise of the present invention does not increase hardware cost, power consumption and size, can arbitrarily flexible configuration raising antenna snr of received signal.
Description
Technical field
The present invention relates to a kind of data sampling device and methods improving antenna snr of received signal, belong at signal
Manage technical field.
Background technology
The method of traditional raising antenna snr of received signal is divided into two classes：One kind be improve receiver sensitivity and
Increase antenna gain；Another kind of is by obtaining more samples using the ADC of higher speed at base band end, to obtain higher
Signal restore gain.However both methods has some apparent defects.It is limited by the limits such as structure, technique and cost
System, first method, which can not possibly unlimitedly increase antenna gain, improves snr of received signal；The raising of ADC sample rates is not
The unprecedented soaring of hardware component cost can be only caused, increases system cost, but also substantially climbing for information storage can be brought
It rises, causes largely using expensive data storage, so the quick soaring of system cost, size and power consumption etc. can be caused.
Array antenna is widely used in radar, communication and the related application of positioning, such as MIMO millimetre-wave radars, extensively
For automobile (pilotless automobile) security fields, realizes to surrounding objects real time distance, tests the speed and angle measurement, this array day
Line uses multiple dual-mode antennas, can enhance the signal-to-noise ratio for receiving signal.In passive electronic reconnaissance field, multiple reception antennas
It is arranged according to certain geometrical relationship, constitutes certain array configuration, realized and the signal of remote radiant source target is received
With united information processing, multiple reception antennas enhance the signal-to-noise ratio for receiving signal, realize two-dimentional angle measurement and survey to target
Away from array antenna can realize that the cost that the improvement of snr of received signal is paid is to be used to obtain using multiple reception antennas
More signal messages are taken, but system complexity, cost are unprecedented soaring.On the other hand, in real Beam radar application scenario,
As soon as often dual-mode antenna shares a mechanical scanning antennas in systems, so improving antenna snr of received signal becomes
One new project.
Invention content
In view of this, the present invention develops a kind of data sampling device and method improving antenna snr of received signal, energy
Enough to realize in the case where not increasing ADC sample rates and reception antenna number, Signal-to-Noise is effectively improved.
Realize that technical scheme is as follows：
A kind of data sampling device improving antenna snr of received signal, including clock generator, L frequency dividers, clock
Pulse counter, L path multiplexers and sample rate are 1/TsADC devices；
The clock pulses that clock generator generates is sent into pulse counter, the output C of pulse counter1,…,CNAs more
The selection of path multiplexer controls signal, and the clock pulses that clock generator generates also is sent into L frequency dividers；
When L frequency dividers generation a cycle is sampling of the clock signal of L times of counter clock cycle as ADC devices
Clock；
ADC devices sample the baseband signal of input, an input terminal of output connection multiplexer；
The remaining input terminal of multiplexer is grounded, and is exported under the control of the selection control signal, is realized
Period is Ts" L zero of interpolation " discrete series sampling.
A kind of data sampling method improving antenna snr of received signal, detailed process are：ADC devices are to baseband signal
It is sampled, and is exported after L zero of interpolation between two sampled points.
Advantageous effect
The present invention passes through L zero of interpolation between two sampled points so that is not increasing ADC sample rates, is not increasing hard
Under the premise of part cost, power consumption and size, can arbitrarily flexible configuration raising antenna snr of received signal.
Description of the drawings
Fig. 1：(a) antenna receives signal time-domain diagram, (b) corresponding spectrogram；
Fig. 2：(a) period is TsImpulse sample sequence time-domain diagram, (b) corresponding spectrogram；
Fig. 3：(a) period is TsUniform sampling discrete series time-domain diagram, (b) corresponding spectrogram；
Fig. 4：(a) antenna receives signal time-domain diagram, (b) corresponding spectrogram；
Fig. 5：(a) period isImpulse sequence time-domain diagram, (b) corresponding spectrogram；
Fig. 6：(a) period isUniform sampling discrete series time-domain diagram, (b) corresponding spectrogram；
Fig. 7：(a) period is Ts" L-1 zero of interpolation " impulse sequence(b) corresponding spectrogram
Fig. 8：It is T for the period in Fig. 7 (a)s" L-1 zero of interpolation " impulse sequence be added by three impulse sequences after
Merge and constitute,
Fig. 9：(a) the discrete series time-domain diagram of " L-1 zero of interpolation ", (b) corresponding spectrogram；
Figure 10：The signal sampling device of interpolation zero of the present invention.
Specific implementation mode
The present invention is described in detail with specific example below in conjunction with the accompanying drawings.
Antenna receives signal acquiring method
Assuming that radar return signal is band-limited signal, by taking real Beam radar mechanical scanning antennas receives signal as an example, at that time
Domain waveform figure spectrogram corresponding with its is respectively f (t) and F (ω), (b) shown such as Fig. 1 (a), uniform impulse sampler (week
Phase property Sampling device such as ADC) infinite impulse sequence time domain waveform and frequency-domain waveform figure be respectivelyWith
(b) shown such as Fig. 2 (a), antenna receives signal after a series of processing of radio frequency unit, becomes baseband signal, using
The time domain and frequency-domain waveform figure of discrete signal sequence after the sampling of uniform sampling device are respectively fs(t) and Fs(ω), such as Fig. 3 (a),
(b) shown in, that this process actually executes is f (t) withTime domain multiplication, F (ω) withThe knot of frequency domain convolution
Fruit, i.e.,AndThen haveWhen Qwest's sampling thheorem in satisfaction, that is, ωs＞
2ωmWhen,After the low-pass filter that a centre frequency is zero, so that it may with from the frequency spectrum F of sampled signals
The frequency spectrum for restoring original signal in (ω), i.e., from base band sampled signal fs(t) restore antenna in and receive signal f (t).Pay attention to：From Fs
As can be seen that its spectrum peak is in (ω) spectrogram
Increase the method that ADC sample rates improve antenna signal-to-noise ratio
Based on principle same as antenna reception signal acquiring method, but pass through and increase ADC sample rates, namely sampling
Rate is L times (L ＞ 1) of original ADC sample rates, and the sampling period is originalObtain at this time respectively with Fig. 1, Fig. 2, Fig. 3 couple
The time domain waveform and spectrogram answered, are shown in Fig. 4 (a), and (b), Fig. 5 (a) is (b) shown (b) with Fig. 6 (a).Its corresponding process isAndThen haveThe low-pass filtering for being zero by a centre frequency
After device, so that it may with from the frequency spectrum F of sampled signals'Restore the frequency spectrum of original signal in (ω).Pay attention to：From Fs'It can in (ω) spectrogram
To find out, spectrum peak isIt is increased to original L times.
Compare Fig. 3 (b) and Fig. 6 (b), it can be seen that the signal-to-noise ratio of baseband signal is in ω=0 after low-pass filter
Place improves L times, this is because ADC sample rates improve L times more originally, so the ADC samplings of higher speed can cause more
Information is collected, after coherent accumulation, obtains higher signal-to-noise ratio, however the cost paid thus is：ADC devices at
Originally the unprecedented soaring of cost, carrying cost etc., is calculated.
Based on the above analysis, the present invention provides a kind of side for improving antenna signal-to-noise ratio under the premise of not increasing ADC sample rates
Method, concrete analysis are as follows：
A kind of new sampling impulse sequence is designed, this sampling pulse sequence does not change ADC sampling rates, and
It is to insert L-1 zero between the two pulses, is T to construct a cycles" interpolation zero " impulse sequenceAs shown in Fig. 7 (a), its spectrogramAs shown in Fig. 7 (b).
In the present embodiment, illustrate by taking L=3 as an example, the period is T in Fig. 7 (a)s" L-1 zero of interpolation " impulse sequence
Row merge after being added by three impulse sequences to be constituted, as shown in figure 8, the period is Ts" 2 zeros of interpolation " impulse sequenceIt is by the periodImpulse sequencePeriod is TsImpulse sequenceWithMerge
It constitutes.
Derive " L-1 zero of interpolation " impulse sequence general expression below, with Fig. 8 periods be impulse sequence it is corresponding be the impulse sequence that the period is and Fig. 8 periods are TsImpulse sequence is corresponding be T in the periodsImpulse sequence and Fig. 8 periods be TsPunching
Swash sequence it is corresponding be the period be TsImpulse sequence
So the period is Ts" L-1 zero of interpolation " impulse sequenceIt is in frequency domain pair
The Fourier transformation answered is also periodic sequence, is the Fourier transformation addition group by above three period impulse sequence
It closes, that is, has
Baseband signal passes through " L-1 zero of interpolation " impulse sequenceDiscrete series time domain after sampling and frequency domain
Oscillogram is respectivelyWithIt is (b) shown such as Fig. 9 (a), and meet
When Qwest's sampling thheorem in satisfaction, after low-pass filter, so that it may with from the frequency spectrum of sampled signalThe middle frequency spectrum for restoring original signal, i.e., from base band sampled signalMiddle recovery antenna receives signal f (t).Pay attention to：
FromAs can be seen that its spectrum peak is in spectrogramObviously, compared to Fig. 6 (b), spectrum peak increases
Largely improve signal-to-noise ratio.
Based on above-mentioned analysis, the present invention provides a kind of data sampling device improving antenna snr of received signal, including
It is by using 1 clock generator, 1 L frequency divider, 1 clock pulse counter, 1 L path multiplexer and 1 sample rate
1/TsADC devices can build and realize a cycle be Ts" L-1 zero of interpolation " discrete seriesSuch as
Shown in Figure 10.
In Fig. 10, the clock pulses that clock generator generates is sent into pulse counter, the output of pulse counter
C1,…,CNSelection as multiplexer controls signal, and (address code is C successively from a high position to low level1,…,CN), N's takes
Value depends on L, and the relationship of the two is L=2N, L is the number for needing interpolation zero of setting.The another way of clock generator passes through
It after crossing L frequency dividings, generates a cycle and is the clock signal of L times of counter clock cycle, and be sent into modulus sampler ADC and carry out
Sampling, the data port S of the sampling output access multiplexer of ADC1, and other ports S of multiplexer2,…,SL
Ground connection.It is T to thereby realize the periods" L-1 zero of interpolation " discrete seriesSampling.
Below with N=2, for the discrete series of L-1=3 zero of interpolation, the truth table of data selector is write out, such as
Shown in table 1.
Table 1
| C1 | C2 | fT,L(n) |
| 0 | 1 | S1(ADC) |
| 1 | 0 | S2(0) |
| 1 | 1 | S3(0) |
| 0 | 0 | S4(0) |
Signal C is controlled by selection1,C2(address code) chooses a circuit-switched data to send to Ausgang from 4 circuit-switched datasT,L(n),
To
The present invention one is that the spectral change rule of " interpolation zero " discrete series afterwards is derived from principle, to be hard
Part realization is laid a good foundation.Second is that realizing a kind of " interpolation zero " discrete series under the premise of not improving ADC sample rates
Physics realization device has simple structure, advantage of low cost, while can improve antenna snr of received signal, in thunder
Reach, communicate, can extensive use in array signal processing.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the protection model of the present invention
It encloses.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this hair
Within bright protection domain.
Claims (2)
1. a kind of data sampling device improving antenna snr of received signal, which is characterized in that divide including clock generator, L
Frequency device, clock pulse counter, L path multiplexers and sample rate are 1/TsADC devices；
The clock pulses that clock generator generates is sent into pulse counter, the output C of pulse counter1,…,CNIt is multiple as multichannel
Signal is controlled with the selection of device, the clock pulses that clock generator generates also is sent into L frequency dividers；
L frequency dividers generation a cycle is sampling clock of the clock signal of L times of counter clock cycle as ADC devices；
ADC devices sample the baseband signal of input, an input terminal of output connection multiplexer；
The remaining input terminal of multiplexer is grounded, and is exported under the control of the selection control signal, and week is realized
Phase is Ts" L zero of interpolation " discrete series sampling.
2. a kind of data sampling method improving antenna snr of received signal, which is characterized in that detailed process is：ADC devices pair
Baseband signal is sampled, and is exported after L zero of interpolation between two sampled points.
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| CN108599768B CN108599768B (en) | 2021-09-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2491850Y (en) * | 2001-07-12 | 2002-05-15 | 浙江大学 | Digital sampling device for power system a.c. signal |
| CN1822581A (en) * | 2005-10-04 | 2006-08-23 | 威盛电子股份有限公司 | Interpose module,interposer and its method |
| CN101505102A (en) * | 2002-11-14 | 2009-08-12 | 艾科嘉公司 | Switch power converter and system for controlling a plurality of the same |
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2018
- 2018-01-19 CN CN201810054538.9A patent/CN108599768B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2491850Y (en) * | 2001-07-12 | 2002-05-15 | 浙江大学 | Digital sampling device for power system a.c. signal |
| CN101505102A (en) * | 2002-11-14 | 2009-08-12 | 艾科嘉公司 | Switch power converter and system for controlling a plurality of the same |
| CN1822581A (en) * | 2005-10-04 | 2006-08-23 | 威盛电子股份有限公司 | Interpose module,interposer and its method |
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