CN108490256A - A kind of two phase difference between channels acquisition methods of psk signal and device based on multiline - Google Patents
A kind of two phase difference between channels acquisition methods of psk signal and device based on multiline Download PDFInfo
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Abstract
The present invention relates to a kind of two phase difference between channels acquisition methods of psk signal based on multiline, belong to digital signal processing technique field, solve the problems, such as that two channel phase difference calculating precision are relatively low under Low SNR in the prior art.It specifically includes：AD samplings are synchronized to the psk signal in two channels, total sampling number in each channel is N；Any channel in two channels is chosen as reference channel, seeks the robust power spectrum density of reference channel sampled signal；According to the robust power spectrum density of reference channel sampled signal, whole phase difference spectral lines in channel sample signal estimation bandwidth are determined；According to the phase difference spectral line, two phase difference between channels of psk signal is sought.And corresponding device has been obtained according to the two phase difference between channels acquisition methods of psk signal based on multiline, the purpose that two phase difference between channels of degree of precision psk signal is obtained under Low SNR is realized, this method is equally applicable to high s/n ratio condition.
Description
Technical field
The present invention relates to digital signal processing technique field more particularly to a kind of two channels of psk signal based on multiline
Phase difference acquisition methods and device.
Background technology
Two receiving channel phase difference of same emitter Signals is in fields such as interferometer direction finding, signal synthesis, phased array antenna
There is important application.
Under conditions of compared with high s/n ratio, traditional two channel signal phase difference result of calculations one based on maximum spectral method
As can meet application demand.However, under Low SNR, the performance of conventional method declines significantly.Low SNR
Under multiple signals phase difference acquiring technology be the hot issue studied both at home and abroad.
For Low SNR signal, conventional method is that the calculating of two phase differences between channels is promoted using enlarged sample length as cost
Precision.But it is found in practical study, does not often allow to sample for a long time before providing phase difference calculating result, and radiation source
Being also likely to will not long-time radiation signal.In this case, cause phase difference calculating result precision relatively low.
Invention content
In view of above-mentioned analysis, the present invention is intended to provide a kind of two phase difference between channels of psk signal based on multiline obtains
Method and device, to solve the problems, such as that two channel phase difference calculating result precision are relatively low under Low SNR.
The purpose of the present invention is mainly achieved through the following technical solutions：
On the one hand, a kind of two phase difference between channels acquisition methods of psk signal based on multiline are provided, are specifically included：
AD samplings are synchronized to the psk signal in two channels, total sampling number in each channel is N；
Any channel in two channels is chosen as reference channel, seeks the robust power spectrum of reference channel sampled signal
Density；
According to the robust power spectrum density of reference channel sampled signal, determine complete in channel sample signal estimation bandwidth
Portion's phase difference spectral line；
According to the phase difference spectral line, two phase difference between channels of psk signal is obtained.
The present invention has the beneficial effect that：Psk signal two phase difference between channels provided in this embodiment based on multiline obtains
Method makes full use of the phase information that more spectral lines of signal are included to promote same radiation source under low signal-to-noise ratio environment
Two receiving channel phase difference calculating precision of psk signal, this method are equally applicable under the conditions of compared with high s/n ratio.
On the basis of said program, the present invention has also done following improvement：
Further, after the sampled result in two channels being cached respectively, the steady of reference channel sampled signal is sought
Power spectral density.
Advantageous effect using above-mentioned further scheme is：By caching sampled result, adopting for each channel can determine
Number of samples, and subsequent processing is carried out to it after receiving complete sample result.
Further, by reference channel sampled signal xNIt is divided into non-overlapping k sections,
K=N/M (1)
Wherein, M is every section of sampling number, and N is total sampling number.
Advantageous effect using above-mentioned further scheme is：By being segmented to reference channel sampled signal, can obtain
To the spectral line of high-resolution.
Further, by reference channel sampled signal xNBeing divided into has the k sections of overlapping, has half between adjacent two sections of sampled signals
Overlapping,
Wherein, M is every section of sampling number, and N is total sampling number.
Advantageous effect using above-mentioned further scheme is：By providing another optional sampled signal segmented mode,
Be conducive to those skilled in the art to be according to actual needs segmented sampled signal, obtain the spectral line of high-resolution.
Further, the robust power spectrum density for seeking reference channel sampled signal, including：
I-th section of sampled signal is added into rectangular window, obtains result
Wherein, n is sampled point serial number, and i is the hop count of sampled signal, d1[n+ (i-1) M] is the rectangular window that length is M；
Calculate separately the power spectrum of each section plus rectangular window post-sampling signal
ω is the frequency of sampled signal；
Obtain figure average period of sampled signal
Determine robust power spectrum density
Wherein, P (ω) is sampled signal theoretical maximum power spectrum, w1(m) be length be 2M-1 triangle window, m w1
(m) sampling point sequence, D1(ω) is the frequency spectrum for the rectangular window that the length is M, W1(ω) is the rectangle that the length is M
Window is the w that auto-correlation obtains1(m) frequency spectrum.
Advantageous effect using above-mentioned further scheme is：It provides and a kind of calculating sampled signal robust power spectrum density
Method makes full use of the density of the included different frequency ingredient of the power spectral density of signal, effectively reflects signal bandwidth information.
Further, M=32.
Advantageous effect using above-mentioned further scheme is：For sampled signal there is no overlap, there are overlapping two kinds of feelings
Every section of sampling number M=32 can be arranged in condition, and the PSD results stability of signal is good at this time, and segmentation is unlikely to meticulous and causes
Prodigious calculation amount.
Further, according to the robust power spectrum density of reference channel sampled signal, determine that the channel sample signal estimates band
Whole phase difference spectral lines in width, specially：
Extract the corresponding spectral line L of maximum power spectral densities in reference channel sampled signal robust power spectral density function0；
Extract spectral line L0The spectral line L in left sidea, it is the spectral line L0First, left side meets La-1、LaWork(corresponding to+1
Rate spectrum density is all higher than spectral line LaThe spectral line of corresponding power spectral density；
Extract spectral line L0The spectral line L on right sideb, it is the spectral line L0First, right side meets Lb-1、LbWork(corresponding to+1
Rate spectrum density is all higher than spectral line LbThe spectral line of corresponding power spectral density；
La、LbAll spectral lines between and are whole phase difference spectral lines in channel sample signal estimation bandwidth.
Advantageous effect using above-mentioned further scheme is：The corresponding spectral line of maximum power spectral densities is first sought, as
More spectral lines for meeting certain condition are chosen at center, and a large amount of phase informations for including using more spectral lines, it is more accurate to seek
Phase difference calculating as a result, avoid only by a single spectral line calculate phase difference result under Low SNR accuracy rate decline
Problem.
Further, according to the phase difference spectral line, two phase difference between channels of psk signal is obtained, including：
Spectral line L is determined respectivelya、LbCorresponding spectral line is in sampled signal FFT result
The phase difference complex vector Z of two channel sample signals of psk signal is calculated：
Wherein,On the basis of channel sample signal FFT pth point results conjugation；X2(p) it is that another channel sample is believed
The result of number FFT pth points；r1(p) it isMould, r2(p) it is X2(p) mould；φ1(p) it isPhase, φ2
(p) it is X2(p) phase；
The phase information for extracting phase difference complex vector Z, obtains two phase difference between channels of psk signal.
Advantageous effect using above-mentioned further scheme is：Make full use of the signal phase letter that more spectral lines of signal are included
Breath is weighted averagely phase contained by whole spectral lines in signal estimation bandwidth, can effectively be promoted under Low SNR
The computational accuracy of two phase differences between channels, this method are equally applicable under the conditions of high s/n ratio.
On the other hand, a kind of two phase difference between channels acquisition device of psk signal based on multiline is provided, is specifically included：
Signal sampling module synchronizes AD samplings, total sampled point in each channel for the psk signal to two channels
Number is N；
Robust power spectrum density seeks module, for choosing any channel in two channels as reference channel, seeks
The robust power spectrum density of reference channel sampled signal；
Phase difference spectral line determining module determines that this is logical for the robust power spectrum density according to reference channel sampled signal
Whole phase difference spectral lines in road sampled signal estimation bandwidth；
Two phase difference between channels acquisition modules, for according to the phase difference spectral line, obtaining two phase difference between channels of psk signal.
The device is corresponding with the above-mentioned two phase difference between channels acquisition methods of psk signal based on multiline.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.This
Other feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious and
It is clear to, or understand through the implementation of the invention.The purpose of the present invention and other advantages can by specification, claims with
And it realizes and obtains in specifically noted content in attached drawing.
Description of the drawings
Attached drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in entire attached drawing
In, identical reference mark indicates identical component.
Fig. 1 is the two phase difference between channels acquisition methods flow chart of psk signal based on multiline；
Fig. 2 is the PSD function simulation results of typical psk signal；
Fig. 3 is the two phase difference between channels acquisition device flow chart of psk signal based on multiline；
The PSD function simulation results of Fig. 4 BSPK signals；
Fig. 5 a) it is the phase difference result obtained using the application method；
Fig. 5 b) it is the phase difference result obtained using N point maximum spectral methods.
Specific implementation mode
Specifically describing the preferred embodiment of the present invention below in conjunction with the accompanying drawings, wherein attached drawing constitutes the application part, and
It is used to illustrate the principle of the present invention together with embodiments of the present invention, be not intended to limit the scope of the present invention.
The specific embodiment of the present invention discloses a kind of two phase difference between channels of psk signal acquisition based on multiline
Method, flow chart are as shown in Figure 1.
When implementation, following steps are specifically included：
Step S1：AD samplings are synchronized to the psk signal in two channels, total sampling number in each channel is N；
Step S2：Any channel in two channels is chosen as reference channel, seeks the steady of reference channel sampled signal
Strong power spectral density (PSD, power spectral density)；
Step S3：According to the robust power spectrum density of reference channel sampled signal, determine that the channel sample signal estimates band
Whole phase difference spectral lines in width；
Step S4：According to the phase difference spectral line, two phase difference between channels of psk signal is obtained.
Compared with prior art, the psk signal two phase difference between channels acquisition methods provided in this embodiment based on multiline,
The phase information for making full use of more spectral lines of signal to be included promotes same radiation source psk signal under low signal-to-noise ratio environment
Two receiving channel phase difference calculating precision, this method is equally applicable under the conditions of compared with high s/n ratio.
Optionally, after the step S1, after first the sampled result in two channels can also be cached respectively, then into
Row step S2.By caching sampled result, it can determine the sampling number in each channel, ensure the integrality of sampled result, just
In subsequent processing, the accuracy of handling result is improved.
In view of the power spectral density of signal indicates the density of the included different frequency ingredient of signal, it can effectively reflect letter
Number bandwidth information.In order to obtain the reliable result of calculation of signal bandwidth, on the basis of the above embodiments, of the invention is a certain
Embodiment can also be by using the power spectral density of adding window average algorithm signal Analysis.
Specifically, the robust power spectrum density of estimating sampling signal may include steps of,
By reference channel sampled signal xNIt is divided into non-overlapping k sections,
K=N/M (1)
Wherein, M is every section of sampling number, and N is total sampling number.
In another embodiment, by reference channel sampled signal xNBeing divided into has the k sections of overlapping, adjacent two sections of sampled signals it
Between have half overlapping,
Wherein, M is every section of sampling number, and N is total sampling number.
By being segmented to reference channel sampled signal, the spectral line of high-resolution can be obtained.
I-th section of sampled signal is added into rectangular window, obtains result
Wherein, n is sampled point serial number, and i is the hop count of sampled signal, d1[n+ (i-1) M] is the rectangular window that length is M；
Calculate separately the power spectrum of each section plus rectangular window post-sampling signal
ω is the frequency of sampled signal；
Obtain figure average period of sampled signal
Determine robust power spectrum density
Wherein, P (ω) is sampled signal theoretical maximum power spectrum, w1(m) be length be 2M-1 triangle window, m w1
(m) sampling point sequence, D1(ω) is the frequency spectrum for the rectangular window that the length is M, W1(ω) is the rectangle that the length is M
Window is the w that auto-correlation obtains1(m) frequency spectrum.
Preferably, every section of sampling number M can be set there is no overlapping, there are overlapping two kinds of situations for sampled signal
=32, the PSD results stability of signal is good at this time, and segmentation is unlikely to meticulous and leads to prodigious calculation amount.
Fig. 2 is using the obtained robust power spectrum density curve graph of the above method.
According to the robust power spectrum density of reference channel sampled signal, determine complete in channel sample signal estimation bandwidth
Portion's phase difference spectral line, specially：
The step 3 further comprises：
Step S31：It is corresponding to extract maximum power spectral densities in reference channel sampled signal robust power spectral density function
Spectral line L0；
Step S32：Extract spectral line L0The spectral line L in left sidea, it is the spectral line L0First, left side meets La-1、La+ 1 institute
Corresponding power spectral density is all higher than spectral line LaThe spectral line of corresponding power spectral density；
Step S33：Extract spectral line L0The spectral line L on right sideb, it is the spectral line L0First, right side meets Lb-1、Lb+ 1 institute
Corresponding power spectral density is all higher than spectral line LbThe spectral line of corresponding power spectral density；
La、LbAll spectral lines between and are whole phase difference spectral lines in channel sample signal estimation bandwidth.
The corresponding spectral line of maximum power spectral densities is first sought, as center, chooses more spectral lines for meeting certain condition,
The a large amount of phase informations for including using more spectral lines seek more accurate phase difference calculating as a result, avoiding only by single
Spectral line calculating phase difference result is under Low SNR the problem of accuracy rate decline.
The step 4 further comprises：
Step S41：Spectral line L is determined respectivelya、LbCorresponding spectral line is in sampled signal FFT result
Step S42：The phase difference complex vector Z of two channel sample signals of psk signal is calculated：
Wherein,On the basis of channel sample signal FFT pth point results conjugation；X2(p) it is that another channel sample is believed
The result of number FFT pth points；r1(p) it isMould, r2(p) it is X2(p) mould；φ1(p) it isPhase, φ2(p)
For X2(p) phase；
Step S43：The phase information for extracting phase difference complex vector Z, obtains two phase difference between channels of psk signal.
The application makes full use of the signal phase information that more spectral lines of signal are included, i.e., to complete in signal estimation bandwidth
Phase contained by portion's spectral line is weighted averagely, can effectively promote the computational accuracy of two phase differences between channels under Low SNR, should
Method is equally applicable under the conditions of high s/n ratio.
And devise corresponding device, phase according to the above-mentioned two phase difference between channels acquisition methods of psk signal based on multiline
The device flow chart answered is as shown in Figure 3.
Following each processes and effect for illustrating above-described embodiment method with specific example.
The present embodiment selects bpsk signal, carrier frequency 80MHz, signal bandwidth 17kHz, bandpass sampling frequency fs=4.5649*
105Hz, sampling number are 1024 points, coupling bandwidth Signal to Noise Ratio (SNR)=0dB, and the phase difference between two channels is 55 °.Using upper
It states embodiment step S2 to estimate robust power spectrum density, wherein being selected specifically at 32 points per segment signal length, overlaps 50%.Figure
The 4 robust power spectral density functions for giving certain emulation gained can obtain l according to step S3a=7 × 32=224, lb=11 ×
32=352.
For this bpsk signal, carry out 1000 emulation, Fig. 5 a) it gives in this 1000 times emulation, it is carried based on the application
The phase difference between channels that the multi-line method gone out obtains, and counted rms=5.07 ° of the mean square deviation of phase difference result.Fig. 5 b) it gives
Using the phase difference between channels of traditional maximum spectral method estimation gained, and the mean square deviation rms=of phase difference result is counted
13.5°.Analysis can obtain, based on the two phase difference between channels acquisition methods of psk signal based on multiline that the application proposes, phase difference
The precision of result of calculation is significantly better than the estimated result based on traditional multi-line method.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of two phase difference between channels acquisition methods of psk signal based on multiline, which is characterized in that specifically include：
AD samplings are synchronized to the psk signal in two channels, total sampling number in each channel is N；
Any channel in two channels is chosen as reference channel, the robust power spectrum for seeking reference channel sampled signal is close
Degree；
According to the robust power spectrum density of reference channel sampled signal, whole phases in channel sample signal estimation bandwidth are determined
Potential difference spectral line；
According to the phase difference spectral line, two phase difference between channels of psk signal is obtained.
2. the psk signal two phase difference between channels acquisition methods according to claim 1 based on multiline, which is characterized in that
After the sampled result in two channels is cached respectively, the robust power spectrum density of reference channel sampled signal is sought.
3. the psk signal two phase difference between channels acquisition methods according to claim 1 or 2 based on multiline, feature exist
In by reference channel sampled signal xNIt is divided into non-overlapping k sections,
K=N/M (1)
Wherein, M is every section of sampling number, and N is total sampling number.
4. the psk signal two phase difference between channels acquisition methods according to claim 1 or 2 based on multiline, feature exist
In by reference channel sampled signal xNBeing divided into has the k sections of overlapping, has half overlapping between adjacent two sections of sampled signals,
Wherein, M is every section of sampling number, and N is total sampling number.
5. the psk signal two phase difference between channels acquisition methods according to claim 3 or 4 based on multiline, feature exist
In, the robust power spectrum density for seeking reference channel sampled signal, including：
I-th section of sampled signal is added into rectangular window, obtains result
Wherein, n is sampled point serial number, and i is the hop count of sampled signal, d1[n+ (i-1) M] is the rectangular window that length is M；
Calculate separately the power spectrum of each section plus rectangular window post-sampling signal
ω is the frequency of sampled signal；
Obtain figure average period of sampled signal
Determine robust power spectrum density
Wherein, P (ω) is sampled signal theoretical maximum power spectrum, w1(m) be length be 2M-1 triangle window, m w1(m)
Sample point sequence, D1(ω) is the frequency spectrum for the rectangular window that the length is M, W1(ω) is that the rectangular window that the length is M is done
The w that auto-correlation obtains1(m) frequency spectrum.
6. the psk signal two phase difference between channels acquisition methods according to claim 3 or 4 based on multiline, feature exist
In M=32.
7. the psk signal two phase difference between channels acquisition methods according to claim 1 based on multiline, which is characterized in that
According to the robust power spectrum density of reference channel sampled signal, whole phase differences in channel sample signal estimation bandwidth are determined
Spectral line, specially：
Extract the corresponding spectral line L of maximum power spectral densities in reference channel sampled signal robust power spectral density function0；
Extract spectral line L0The spectral line L in left sidea, it is the spectral line L0First, left side meets La-1、LaPower spectrum corresponding to+1
Density is all higher than spectral line LaThe spectral line of corresponding power spectral density；
Extract spectral line L0The spectral line L on right sideb, it is the spectral line L0First, right side meets Lb-1、LbPower spectrum corresponding to+1
Density is all higher than spectral line LbThe spectral line of corresponding power spectral density；
La、LbAll spectral lines between and are whole phase difference spectral lines in channel sample signal estimation bandwidth.
8. the psk signal two phase difference between channels acquisition methods according to claim 7 based on multiline, which is characterized in that
According to the phase difference spectral line, two phase difference between channels of psk signal is obtained, including：
Spectral line L is determined respectivelya、LbCorresponding spectral line is in sampled signal FFT result
The phase difference complex vector Z of two channel sample signals of psk signal is calculated：
Wherein,On the basis of channel sample signal FFT pth point results conjugation；X2(p) it is another channel sample signal FFT
The result of pth point；r1(p) it isMould, r2(p) it is X2(p) mould；φ1(p) it isPhase, φ2(p) it is X2
(p) phase；
The phase information for extracting phase difference complex vector Z, obtains two phase difference between channels of psk signal.
9. a kind of two phase difference between channels acquisition device of psk signal based on multiline, which is characterized in that including：
Signal sampling module synchronizes AD samplings for the psk signal to two channels, and total sampling number in each channel is equal
For N；
Robust power spectrum density seeks module, for choosing any channel in two channels as reference channel, seeks benchmark
The robust power spectrum density of channel sample signal；
Phase difference spectral line determining module determines that the channel is adopted for the robust power spectrum density according to reference channel sampled signal
Sample signal estimates whole phase difference spectral lines in bandwidth；
Two phase difference between channels acquisition modules, for according to the phase difference spectral line, obtaining two phase difference between channels of psk signal.
10. a kind of two phase difference between channels acquisition device of psk signal based on multiline according to claim 9, feature
It is, the phase difference spectral line acquisition module includes：
Maximum power spectral densities extraction module, for extracting maximum work in reference channel sampled signal robust power spectral density function
The corresponding spectral line L of rate spectrum density0；
First spectral line extraction module, for extracting spectral line L0The spectral line L in left sidea, it is the spectral line L0First, left side meets La-
1、LaPower spectral density corresponding to+1 is all higher than spectral line LaThe spectral line of corresponding power spectral density；
Second spectral line extraction module, for extracting spectral line L0The spectral line L on right sideb, it is the spectral line L0First, right side meets Lb-
1、LbPower spectral density corresponding to+1 is all higher than spectral line LbThe spectral line of corresponding power spectral density；
Phase difference spectral line determining module, for determining La、LbAll spectral lines between and are that the channel sample signal is estimated in bandwidth
Whole phase difference spectral lines；
The two phase differences between channels acquisition module includes：
Corresponding spectral line determining module, for determining spectral line La、LbCorresponding spectral line in sampled signal FFT result
Phase difference complex vector computing module, the phase difference complex vector Z for two channel sample signals of psk signal to be calculated：
Wherein,On the basis of channel sample signal FFT pth point results conjugation；X2(p) it is another channel sample signal FFT
The result of pth point；r1(p) it isMould, r2(p) it is X2(p) mould；φ1(p) it isPhase, φ2(p) it is X2
(p) phase；
Two phase difference between channels determining module of psk signal, the phase information for extracting phase difference complex vector Z obtain psk signal two
Phase difference between channels.
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