CN107347042A - A kind of multi-stage digital channel subchannel exports decision method - Google Patents
A kind of multi-stage digital channel subchannel exports decision method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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Abstract
The invention belongs to communication technical field, more particularly to a kind of multi-stage digital channel subchannel output decision method.The inventive method, still can be in the method made decisions to the subchannel output of multi-stage digital channelizing of high accuracy when echo signal frequency values are close to first order digital channel subchannel intersection, and is highly suitable for realizing in software and hardware platform.The inventive method can still ensure the accuracy of multi-stage digital channel subchannel output judgement when the frequency values of echo signal are close to first order digital channel subchannel intersection.
Description
Technical field
The invention belongs to communication technical field, more particularly to a kind of multi-stage digital channel subchannel output decision method.
Background technology
With the fast development of electronic technology, an important development trend of Radar Technology is sent out using broadband or ultra wide band
Signal is penetrated, this causes traditional conventional simulation ferret receiver to meet actual due to the limitation by analog device
Application requirement.Digital channelizing reconnaissance receiver is because its instantaneous band is wide, high sensitivity, and dynamic range is big and to handle multichannel same
When arriving signal ability, be used widely in modern electronic warfare, become the reconnaissance receiver of most development potentiality
One of.Digital channelized receiver carries out frequency domain channel division to the signal received, can handle the overlapping letter of multichannel time domain simultaneously
Number, there is very high frequency resolution, and the signal that can be directed in target subchannel carries out accurately signal analysis in detail.With
The extensive use of digital channelizing reconnaissance receiver and deepening continuously for research, in order to obtain higher frequency resolution, people
Generally use multi-stage digital channelizing is handled echo signal, therefore the judgement side of multi-stage digital channel subchannel output
Method, become the important step of digital channelized receiver design, can it is directly connected to our echo signals interested
Correctly intercepted and captured.
At present, multi-stage digital channel subchannel output decision method be it is a kind of based on energy accumulation and compare choosing greatly
Conventional method.First, N point energy accumulations are carried out to the data of first order digital channelizing subchannel to be adjudicated output respectively, so
Compared with judging threshold, the subchannel that energy accumulation value exceedes judging threshold is considered as having the energy value that will build up on afterwards
Signal output, the subchannel that energy accumulation value is no more than threshold value are considered as no signal output, will have the subchannel of signal output
Output data be input to second level digital channelizing；When two adjacent first order digital channel subchannels have signal defeated
When going out, compared by the accumulation energy of two neighboring subchannel, it is believed that energy accumulation is worth larger subchannel for first order numeral
Subchannel existing for channelizing actual signal, the output data of true subchannel is input to second level digital channelizing.Use again
Same mode carries out output judgement to the subchannel of second level digital channelizing respectively.
Conventional multi-level digital channel subchannel output decision steps are as follows：
(1) energy of first order digital channelizing subchannel output data to be adjudicated is calculated：
Assuming that the data of first order digital channel subchannel output are：
ykr(n),yki(n), n=0,1,2 ..., D-1；K=0,1,2 ..., K-1
Wherein, k is subchannel label, and the subchannel that K is divided by first order digital channelizing is total, extracting multipleD is the data points of each subchannel output of first order digital channelizing.ykr(n) it is first order digital channelizing kth
The real part of sub-channels output data, yki(n) it is the imaginary part of k-th of subchannel output data of first order digital channelizing, due to
The instantaneous monitoring bandwidth B of digital channelized receiver is sample rate fsHalf, i.e.,Just correspond to first order numeral
Before channelizingSub-channels, that is to say, that echo signal is only possible to before being present in first order digital channelizingHeight
In channel, so only needing to before first order digital channelizingSub-channels make decisions.Assuming that k1To wait to adjudicate
The subchannel label of first order digital channelizing, then
OrderFor first order digital channelizing kth1The energy of individual subchannel output data to be adjudicated：
Wherein,For first order digital channelizing kth to be adjudicated1The real part of sub-channels output data,For
First order digital channelizing kth to be adjudicated1The imaginary part of sub-channels output data.
(2) N point energy accumulations are carried out to the output data of first order digital channelizing subchannel to be adjudicated：
Wherein,For first order digital channelizing kth1The N point energy accumulation values of sub-channels output data.
(3) output judgement is carried out to first order digital channelizing subchannel to be adjudicated using judging threshold：
Assuming that judging threshold is hold, ifThen will be marked as k1First order digital channel beggar
Channel judging is to have signal output subchannel, ifThen will be marked as k1The first order digital channel beggar letter
Road judgement exports subchannel for no signal.
The subchannel output data that first order digital channelizing has signal output is input to second level digital channelizing：
It will adjudicate and be input to second level numeral for the output data for having the first order digital channel subchannel of signal output
Channelizing, if first order digital channelizing adjacent sub-channel kxAnd kx+1Judgement is has signal output subchannel, then to them
Energy accumulation valueWithIt is compared, it is believed that energy accumulation is worth larger subchannel to be existed for actual signal
Subchannel, and the output data of subchannel existing for actual signal is input to second level digital channelizing.
Output judgement is carried out to the subchannel of second level digital channelizing respectively with same decision method：
Output judgement is carried out to the subchannel of second level digital channelizing respectively with same decision method, obtains target letter
Number be located at second level digital channelizing in subchannel label.
Conventional multi-level digital channel subchannel exports the flow of decision method, as shown in Figure 1.
The advantages of this traditional multi-stage digital channel subchannel exports decision method is that logical sum structure is very simple
It is single, it is easy to implement.But a disadvantage is that when the frequency values of echo signal are close to first order digital channel subchannel intersection,
The energy accumulation value of adjacent sub-channel output can be very close, and the energy accumulation value of false subchannel can even exceed true son sometimes
The energy accumulation value of channel, the method that energy accumulation value size is compared in simple dependence often cause first order digital channelizing
The inaccuracy of subchannel output judgement, the output data in turn resulting in first order digital channelizing mistake subchannel are input to second
Level digital channelizing, the subchannel of second level digital channelizing is caused to export mistake in judgment.When the frequency values of echo signal lean on very much
During nearly first order digital channel subchannel intersection, this traditional multi-stage digital channel subchannel output decision method is just
Very big error can be produced, therefore traditional multi-stage digital channel subchannel output decision method does not have good stability
And practical application.
The frequency values of echo signal are close to first order digital channel subchannel intersection schematic diagram, as shown in Fig. 2 wherein
First order digital channel subchannel uses even permutation and 50% overlap mode, fsFor sample rate, K is first order digital channelizing
The subchannel sum divided.
The content of the invention
The present invention is directed to prior art problem, proposes one kind in echo signal frequency values close to first order digital channel beggar
During channel intersection, can still the method made decisions be exported with the subchannel to multi-stage digital channelizing of high accuracy, and
And it is highly suitable for realizing in software and hardware platform.The inventive method is believed when the frequency values of echo signal close to first order numeral
During road subchannel intersection, it can still ensure the accuracy of multi-stage digital channel subchannel output judgement, implementation process
Comprise the following steps：
S1, set the first order digital channel subchannel output data as：ykr(n),yki(n), if k1To treat judgement first
The subchannel label of level digital channelizing, wherein,N=0,1,2 ..., D-1, ykr(n) it is the first order
The real part of k-th of subchannel output data of digital channelizing, yki(n) number is exported for k-th of subchannel of first order digital channelizing
According to imaginary part, k is first order digital channel subchannel label, the subchannel sum that K is divided by first order digital channelizing,
K=0,1,2 ..., data points that K-1, D are the output of each subchannel of first order digital channelizing, extracting multipleBy
In the instantaneous monitoring bandwidth B of digital channelized receiver be sample rate fsHalf, i.e.,Just correspond to the first series
Before word channelizing outputSub-channels, that is to say, that echo signal is only possible to before being present in first order digital channelizingIn sub-channels, so we are only needed to before first order digital channelizingSub-channels make decisions；
S2, the output data to first order digital channelizing subchannel to be adjudicated carry out N point energy accumulations, are specially：
S21, the energy for calculating first order digital channelizing subchannel output data to be adjudicated
Wherein,For first order digital channelizing kth1The energy of individual subchannel output data to be adjudicated,For the first series
Word channelizing kth1The real part of individual subchannel output data to be adjudicated,For first order digital channelizing kth1It is individual to treat judgement
The imaginary part of channel output data；
S22, the energy to first order digital channelizing subchannel output data to be adjudicated carry out N point energy accumulationsWherein,For first order digital channelizing kth1Individual subchannel output data to be adjudicated
N point energy accumulation values,
S3, made decisions using output of the judging threshold to first order digital channelizing subchannel to be adjudicated：If judgement
Threshold value is hold, ifThen by first order digital channelizing marked as k1Subchannel to be adjudicated judgement be
There is signal output subchannel, ifThen by first order digital channelizing marked as k1Subchannel to be adjudicated sentence
Certainly for no signal export subchannel, wherein, it is described judgement limit value hold be empirical value；
S4, the output data for the first order digital channel subchannel for having signal output is input to second level digital channel
Change, if the adjacent subchannel k to be adjudicated of first order digital channelizingxAnd kx+1Judgement, then will mark to there is signal output subchannel
Number it is kxAnd kx+1Subchannel corresponding to output data be separately input to second level digital channelizing；
S5, made decisions using output of the judging threshold to second level digital channelizing subchannel to be adjudicated：If judgement
Threshold value is hold, ifThen by second level digital channelizing marked as K1Subchannel to be adjudicated judgement be
There is signal output subchannel, ifThen by second level digital channelizing marked as K1Subchannel to be adjudicated sentence
Certainly subchannel is exported for no signal；
S6, the output court verdict with reference to the first order and second level digital channel subchannel obtain echo signal positioned at the
The true subchannel label of one-level and second level digital channelizing：
If the number of subchannels that second level digital channelizing is divided is K1If first order digital channelizing is marked as kx's
The output data of subchannel, in the subchannel corresponding to the digital channelizing intermediate zone of the second level, i.e., marked as's
Signal output has been ruled out in subchannel, then has illustrated first order digital channelizing marked as kxSubchannel be false subchannel,
Falseness of the subchannel ruled out in the digital channelizing of the second level marked as echo signal in the digital channelizing of the second level
Subchannel；
If in the subchannel corresponding to the digital channelizing passband of the second level, i.e., marked asWith's
Signal output has been ruled out in subchannel, then has illustrated first order digital channelizing marked as kxSubchannel be true subchannel,
The subchannel ruled out in the digital channelizing of the second level is true in the digital channelizing of the second level marked as echo signal
Subchannel；
If the number of subchannels that second level digital channelizing is divided is K1If first order digital channelizing is marked as kx+1
Subchannel output data, in the subchannel corresponding to the digital channelizing intermediate zone of the second level, i.e., marked as
Subchannel in ruled out signal output, then illustrate first order digital channelizing marked as kx+1Subchannel believe for false son
Road, void of the subchannel ruled out in the digital channelizing of the second level marked as echo signal in the digital channelizing of the second level
False subchannel；
If in the subchannel corresponding to the digital channelizing passband of the second level, i.e., marked asWith's
Signal output has been ruled out in subchannel, then has illustrated first order digital channelizing marked as kx+1Subchannel be true subchannel,
The subchannel ruled out in the digital channelizing of the second level is true in the digital channelizing of the second level marked as echo signal
Subchannel.
The beneficial effects of the invention are as follows：
The inventive method when the frequency values of echo signal are very close to the intersection of first order digital channel subchannel, according to
The high accuracy of multi-stage digital channel subchannel output judgement can so be ensured, had in actual applications stable well
Property, it is well suited for applying in the hardware platform such as software platform and FPGA, DSP, realizes the output of multi-stage digital channel subchannel
Judgement.
Brief description of the drawings
Fig. 1 is conventional multi-level digital channel subchannel output judgement flow chart.
Fig. 2 is echo signal frequency values close to first order digital channel subchannel intersection schematic diagram.
Fig. 3 is the inventive method flow chart.
Fig. 4 is first order digital channelizing structure chart in embodiment 1.
Fig. 5 is second level digital channelizing structure chart in embodiment 1.
Fig. 6 is the frequency spectrum shift and second level digital channelizing of the true subchannel of first order digital channelizing in embodiment 1
Subchannel corresponds to schematic diagram.
Fig. 7 is the frequency spectrum shift and second level digital channelizing of first order digital channelizing falseness subchannel in embodiment 1
Subchannel corresponds to schematic diagram.
Fig. 8 is the present invention and detection probability of success figure of the conventional method in echo signal different frequency in embodiment 2.
Embodiment
The present invention will be described below in conjunction with the accompanying drawings.
Embodiment 1,
As shown in Figure 3：
Consider simple signal of 1 frequency for f=9MHz as echo signal, it is assumed that sample rate fs=500MHz, sampling
Cycle Ts=2ns, sampling number U=16384, signal noise are white Gaussian noise, signal to noise ratio snr=15dB.
First order digital channelizing is divided into 32 sub-channels, i.e. K=using subchannel even permutation and 50% overlap mode
32, extracting multipleThe output data points of each subchannel of first order digital channelizingSecond
Level digital channelizing is divided into 16 sub-channels, i.e. K using subchannel even permutation and 50% overlap mode1=16, extracting multiple
For
First order digital channelizing structure is as shown in figure 4, wherein, x (n), n=0,1,2 ..., 16383 is the first series
The input data of word channelizing, h (n), n=0,1,2 ..., 255 is 256 rank lowpass prototype filter coefficients, ykr(n) it is first
The real part of level subchannel output data of the digital channelizing marked as k, yki(n) it is son of the first order digital channelizing marked as k
The imaginary part of channel output data, k=0,1,2 ..., 31；N=0,1,2 ..., 1023, Z-1616 data cells of delay are represented,
32 ↓ represent to extract 32 times.
Second level digital channelizing structure as shown in figure 5, wherein,Believe for second level numeral
The real part of road input data,For the imaginary part of second level digital channelizing input data,
It is second level digital channelizing marked as k2Subchannel output data real part,For second level digital channelizing label
For k2Subchannel output data imaginary part, wherein：Wherein, h1(n), n=0,
1,2 ..., 127 is 128 rank lowpass prototype filter coefficients, Z-88 data cells of delay are represented, 16 ↓ expression extracts 16 times.
Because the frequency values of echo signal are truly in the passband of first order digital channel subchannel 1, if the first order
The output data of digital channel subchannel 1 is input to second level digital channelizing, then by first order digital channel subchannel
Understand that this actual signal appears in second level digital channelizing pair with the corresponding relation of second level digital channel subchannel
In the passband subchannel (subchannel i.e. marked as 0,1,2,3 and 12,13,14,15) answered, actual signal meeting in the present embodiment
In the subchannel marked as 13 for appearing in second level digital channelizing.
The true subchannel of first order digital channelizing in the present embodiment, the i.e. frequency spectrum shift of subchannel 1 and the second level numeral
The subchannel corresponded manner of channelizing, as shown in Figure 6.
Because the frequency values of echo signal are also in the intermediate zone of first order digital channel subchannel 0 simultaneously, so
The subchannel 0 of first order digital channelizing can export a spurious signal, if the output number of first order digital channel subchannel 0
According to second level digital channelizing is input to, then by first order digital channel subchannel and second level digital channel subchannel
Corresponding relation understand, this spurious signal appear in transition band sub-channels corresponding to the digital channelizing of the second level (i.e. marked as
4,5,6,7 and 8,9,10,11 subchannel) in, spurious signal appears in second level digital channelizing in the present embodiment
In subchannel marked as 5.
First order digital channelizing falseness subchannel in the present embodiment, the i.e. frequency spectrum shift of subchannel 0 and the second level numeral
The subchannel corresponded manner of channelizing, as shown in Figure 7.
If final court verdict is：The true subchannel of first order digital channelizing be label 1 subchannel, the second series
The subchannel that word channelizing has signal output is the subchannel of label 13, then adjudicates successfully, otherwise judgement failure.
Independent repeated trials 100 times, calculate the judgement probability of success of the present inventionWherein tsTo test number successfully,
T is independent repeated trials total degree.
Subchannel of the invention output judgement performance success of the test probability P in embodiment 1dTo weigh.
Implementation method of the invention comprises the following steps in embodiment 1：
(1) input signal model is produced：Input signal x (n)=[x (0) x (1) ... x (U-1)] is produced by following formula,Wherein, N (n) is white Gaussian noise.
(2) N=8 point energy accumulations are carried out to the output data of first order digital channelizing subchannel to be adjudicated：
Assuming that the output data of first order digital channel subchannel is：ykr(n),yki(n), n=0,1,2 ...,
1023；K=0,1,2 ..., 31, wherein, k is first order digital channel subchannel label, ykr(n) it is first order digital channel
Change the real part of k-th of subchannel output data, yki(n) it is the imaginary part of k-th of subchannel output data of first order digital channelizing.
Because the instantaneous monitoring bandwidth B of digital channelized receiver is sample rate fs=500MHz half, i.e. B ∈ [0,
250MHz], before just corresponding to first order digital channelizingSub-channels, that is to say, that echo signal is only possible to exist
In 16 sub-channels before first order digital channelizing, so we only need preceding 16 sons to first order digital channelizing
Channel carries out output judgement.Assuming that k1For the unsentenced subchannel label of first order digital channelizing, then
OrderFor first order digital channelizing kth1The energy of individual subchannel output data to be adjudicated：
Wherein,For the first series
Word channelizing kth to be adjudicated1The real part of sub-channels output data,For first order digital channelizing kth to be adjudicated1Height
The imaginary part of channel output data.
N=8 point energy accumulations are carried out to the output data of first order digital channelizing subchannel to be adjudicated：
Wherein,For the first series
Word channelizing kth18 energy accumulation values of individual subchannel output data to be adjudicated.
(3) made decisions using output of the judging threshold to first order digital channelizing subchannel to be adjudicated：
Assuming that judging threshold is hold, ifThen by first order digital channelizing marked as k1Treat
Judgement subchannel judgement is to have signal output subchannel, ifThen by first order digital channelizing marked as k1
Subchannel to be adjudicated judgement for no signal export subchannel.
The sub-channel data that first order digital channelizing has signal output is separately input to second level digital channelizing：
The sub-channel data that first order digital channelizing has signal output is separately input to second level digital channelizing.This
In embodiment, first order digital channelizing adjacent sub-channel 0 and subchannel 1 are adjudicated to there is signal output subchannel, then will mark
Number for 0 and 1 subchannel corresponding to output data be separately input to second level digital channelizing.
Output judgement is carried out to the subchannel of second level digital channelizing respectively with same method：
Made decisions with output of the same method respectively to second level digital channel subchannel, obtain second level numeral
The output court verdict of channel subchannel.
(6) obtain echo signal with reference to the first order and the subchannel of second level digital channelizing output court verdict and be located at
The true subchannel label of the first order and second level digital channelizing.
(7) experiment 100 times is repeated, records success of the test number ts, and calculate the detection probability of success
Simulation result is：Pd=100%, i.e. the frequency values of the invention in echo signal are very close to first order digital channelizing
During subchannel intersection, judgement is functional.
Embodiment 2,
The present invention and judgement performance simulation of the conventional method in the case of echo signal different frequency.
In example 2, the frequency value for making echo signal is respectively：F=[1MHz, 2MHz, 3MHz ..., 15MHz],
Remaining simulated conditions is same as Example 1, the step of re-executing embodiment 1, and records the inventive method respectively every
The judgement probability of success under individual echo signal frequency.Under identical simulated conditions, the decision steps of conventional method are performed, equally
Record the judgement probability of success of the conventional method under each echo signal frequency.
In the case of different target signal frequency, the judgement probability of success of the present invention and conventional method is as shown in Figure 8.
From Fig. 8, it will be seen that the present invention, under all echo signal frequencies, the judgement probability of success is
100%, and conventional method moves closer to the sub-channels intersection (i.e. 7.8MHz) of first order digital channelizing two in echo signal
During adjudicate the probability of success and can gradually reduce, so multi-stage digital channel subchannel proposed by the invention output judgement
Method is a kind of efficient multi-stage digital channel subchannel output decision method, echo signal frequency values very close to first
During the intersection of level digital channelizing subchannel, it can still ensure the high precision of multi-stage digital channel subchannel output judgement
Property, in actual applications with good stability, it is well suited for applying in the hardware platform such as software platform and FPGA, DSP, it is real
The output judgement of existing multi-stage digital channel subchannel.
Claims (1)
1. a kind of multi-stage digital channel subchannel exports decision method, it is characterised in that comprises the following steps：
S1, set the first order digital channel subchannel output data as：ykr(n),yki(n), if k1To wait to adjudicate the first series
The subchannel label of word channelizing, wherein,N=0,1,2 ..., D-1, ykr(n) it is first order numeral
The real part of k-th of subchannel output data of channelizing, yki(n) it is k-th of subchannel output data of first order digital channelizing
Imaginary part, k are first order digital channel subchannel label, and the subchannel that K is divided by first order digital channelizing is total, k=
0,1,2 ..., data points that K-1, D are the output of each subchannel of first order digital channelizing, extracting multipleDue to number
The instantaneous monitoring bandwidth B of word channelized receiver is sample rate fsHalf, i.e.,Just correspond to first order numeral letter
Before roadization outputSub-channels, that is to say, that echo signal is only possible to before being present in first order digital channelizingHeight
In channel, so we are only needed to before first order digital channelizingSub-channels make decisions；
S2, the output data to first order digital channelizing subchannel to be adjudicated carry out N point energy accumulations, are specially：
S21, the energy for calculating first order digital channelizing subchannel output data to be adjudicatedIts
In,For first order digital channelizing kth1The energy of individual subchannel output data to be adjudicated,For first order numeral
Channelizing kth1The real part of individual subchannel output data to be adjudicated,For first order digital channelizing kth1It is individual to treat judgement
The imaginary part of channel output data；
S22, the energy to first order digital channelizing subchannel output data to be adjudicated carry out N point energy accumulationsWherein,For first order digital channelizing kth1Individual subchannel output data to be adjudicated
N point energy accumulation values,
S3, made decisions using output of the judging threshold to first order digital channelizing subchannel to be adjudicated：If decision threshold
It is worth for hold, ifThen by first order digital channelizing marked as k1Subchannel to be adjudicated judgement to there is letter
Number output subchannel, ifThen by first order digital channelizing marked as k1Subchannel to be adjudicated judgement be
No signal export subchannel, wherein, it is described judgement limit value hold be empirical value；
S4, the output data for the first order digital channel subchannel for having signal output is input to second level digital channelizing,
If the adjacent subchannel k to be adjudicated of first order digital channelizingxAnd kx+1Judgement is has signal output subchannel, then by label
For kxAnd kx+1Subchannel corresponding to output data be separately input to second level digital channelizing；
S5, made decisions using output of the judging threshold to second level digital channelizing subchannel to be adjudicated：If decision threshold
It is worth for hold, ifThen by second level digital channelizing marked as K1Subchannel to be adjudicated judgement to there is letter
Number output subchannel, ifThen by second level digital channelizing marked as K1Subchannel to be adjudicated judgement be
No signal exports subchannel；
S6, the output court verdict with reference to the first order and second level digital channel subchannel obtain echo signal and are located at the first order
With the true subchannel label of second level digital channelizing：
If the number of subchannels that second level digital channelizing is divided is K1If first order digital channelizing is marked as kxSon letter
The output data in road, in the subchannel corresponding to the digital channelizing intermediate zone of the second level, i.e., marked asSon letter
Signal output has been ruled out in road, then has illustrated first order digital channelizing marked as kxSubchannel be false subchannel,
Falseness son letter of the subchannel ruled out in two-stage digital channelizing marked as echo signal in the digital channelizing of the second level
Road；
If in the subchannel corresponding to the digital channelizing passband of the second level, i.e., marked asWithSon letter
Signal output has been ruled out in road, then has illustrated first order digital channelizing marked as kxSubchannel be true subchannel,
True sub- letter of the subchannel ruled out in two-stage digital channelizing marked as echo signal in the digital channelizing of the second level
Road；
If the number of subchannels that second level digital channelizing is divided is K1If first order digital channelizing is marked as kx+1Son letter
The output data in road, in the subchannel corresponding to the digital channelizing intermediate zone of the second level, i.e., marked asSon letter
Signal output has been ruled out in road, then has illustrated first order digital channelizing marked as kx+1Subchannel be false subchannel,
Falseness son letter of the subchannel ruled out in two-stage digital channelizing marked as echo signal in the digital channelizing of the second level
Road；
If in the subchannel corresponding to the digital channelizing passband of the second level, i.e., marked asWithSon letter
Signal output has been ruled out in road, then has illustrated first order digital channelizing marked as kx+1Subchannel be true subchannel,
True sub- letter of the subchannel ruled out in two-stage digital channelizing marked as echo signal in the digital channelizing of the second level
Road.
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