CN102185816A - Noncoherent differential phase shift keying (DPSK) communication signal chaotic oscillator detector and construction method - Google Patents

Abstract

The invention provides a detector for detecting a noncoherent differential phase shift keying (DPSK) communication signal by a chaotic oscillator and a construction method. In the construction method, M phase diversity channels are formed by the common-frequency Duffing oscillator and circular domain dividers, correspond to array elements of the common-frequency Duffing oscillator respectively, and are used for detecting the noncoherent DPSK communication signal, and a dominant array element channel comprising the most baseband data information is screened and gated by utilizing equal weight data fusion, correlation integration and correlation peak searching technologies, so the aim of detecting the baseband data information in real time from the noncoherent DPSK communication signal is fulfilled. The detector and the construction method are particularly applied to noncoherent DPSK communication signal detection occasions. By the detector and the construction method, array element output presenting a chaotic track pattern can be deleted from a converted one-dimensional time signal, namely the array element output not presenting a periodical track pattern is forbidden to take part in data fusion, the noncoherent DPSK communication signal detection performance of the common-frequency chaotic oscillator can be improved, and engineering practicability is ensured.

Description

Incoherent DPSK signal of communication chaotic oscillator detector and construction method

Technical field

What the present invention relates to is a kind of incoherent signal chaotic oscillator detector and construction method.Particularly relate to a kind of incoherent DPSK signal of communication chaotic oscillator detector and construction method.

Background technology

Number of patent application is to disclose a kind of " to the same frequency Duffing oscillator and the construction method of signal phase insensitivity to be checked " in 200810209736.4 the patent document, same frequency Duffing oscillator wherein provides universality method and technology for detecting incoherent signal with chaotic oscillator, and this makes people become reality with the idea that chaos method detects incoherent signal.But should see, only answer and solved the problem that could detect incoherent signal with chaos method in the document, the incoherent DPSK signal of communication of unpromising real-time detection provides concrete scheme; In fact, limited with each array element phase mark pattern computational complexity of chaotic oscillator frequently by identification, finish detection task to incoherent DPSK signal of communication in real time by the method for document record fully and still have suitable difficulty.

Number of patent application is in 200710071895.8 the patent document, in order to reduce the computation complexity of identification phase path pattern, be the phase path pattern transfer with each array element of frequency chaotic oscillator the one dimension time signal earlier, carry out the DPSK decoding processing again, then with etc. weighted type carry out data fusion, just can obtain the effect that reduces amount of calculation by a relatively large margin.But, because of can not all presenting the cycle track pattern to dpsk signal to be checked simultaneously with each array element of frequency chaotic oscillator, so contain the harmful effect (being equivalent to interference signal) that presents chaos locus pattern array element in the one dimension time signal after its conversion, so, with etc. weighted type carry out data fusion and can not guarantee that incoherent dpsk signal detector has optimum performance.

Obviously, if we can find a kind of method, the array element output that presents the chaos locus pattern is deleted from the one dimension time signal after the conversion, promptly forbid the non-array element output participation data fusion that presents the cycle track pattern, will obtain to promote with the performance that detects irrelevant DPSK signal of communication with the frequency chaotic oscillator so, the incoherent DPSK signal of communication chaotic oscillator detector of Gou Jianing will have engineering practicability more thus.

Summary of the invention

The object of the present invention is to provide a kind of incoherent DPSK signal of communication chaotic oscillator detector that can make structure will have the incoherent DPSK signal of communication chaotic oscillator detector of engineering practicability more.The present invention also aims to provide a kind of construction method of incoherent DPSK signal of communication chaotic oscillator detector.

The object of the present invention is achieved like this:

Incoherent DPSK signal of communication chaotic oscillator detector of the present invention by the difference amplifying unit, touch-the number conversion unit, rearmounted dispensing unit, intelligent processing unit and clock source connect to form; The difference amplifying unit is converted to differential signal to input signal x (t); Touch-the number conversion unit is converted to 14 binary digital signal to x (t), and change over clock is provided by intelligent processing unit, and frequency is determined according to signal to be checked; Rearmounted dispensing unit provides rearmounted configuration for intelligent processing unit; Intelligent processing unit is FPGA or SOPC chip, realizes the oscillator with frequency Duffing; The clock source provides system clock for intelligent processing unit.

Described x (t) is for comprising the external signal of signal to be checked and noise, and the amplitude peak-to-peak value is not more than ± 0.20V.

The construction method of incoherent DPSK signal of communication chaotic oscillator detector of the present invention is:

Utilize with Duffing oscillator, circle territory dispenser frequently constitute M respectively with corresponding with Duffing oscillator array element frequently, as to be used to detect incoherent DPSK signal of communication phase diversity passage, and then flexible strategy such as utilization search technology according to fusion, correlation intergal and relevant peaks, sift out and gating contains maximum base band data information

The array element passage that is dominant, reach the purpose that from incoherent DPSK signal of communication, detects base band data information in real time.

The construction method of of the present invention incoherent DPSK signal of communication chaotic oscillator detector specifically comprises the steps:

1. choose one and do the same frequency Duffing oscillator of array element by M Duffing oscillator, the state equation of array element is expressed as:

Or

In the formula, k=0,1,, M-1 is the numbering of array element k; y ₁And y ₂Output for array element; X (t)=s (t)+n (t) is ω for input external signal, s (t) for its carrier angular frequencies of dpsk signal to be checked, and n (t) is a noise, and a is that external signal is injected intensity factor; γ cos (t) represents array element k internal drive power, Be the first phase of array element k internal drive power, that is:

In the formula, k=0,1,, M-1;

2. choose M identical round territory dispenser, its circle territory cut-off rule equation is provided by formula (4):

$\stackrel{\‾}{y}\left(t\right)=\left\{\begin{array}{cc}+1,& \sqrt{y_1^2+y_2^2}>R\\ -1,& \sqrt{y_1^2+y_2^2}\≤R\end{array}\right.---\left(4\right)$

In the formula, y ₁, y ₂Representative is with the array element output of Duffing oscillator frequently, R be array element present the cycle during track its track neither contact the radius of a border circular areas that is positioned at its inside that does not also pass through,

The one dimension time output signal of representative circle territory dispenser;

3. the DPSK demodulation process is carried out in the output of M round territory dispenser respectively, adopt to need not the bit delay demodulation scheme that carrier wave recovers, its Mathematical Modeling is provided by formula (5):

${\tilde{y}}_k\left(t\right)={\stackrel{\‾}{y}}_k\left(t\right)\⊗{\stackrel{\‾}{y}}_k(t-\mathrm{\τ})---\left(5\right)$

In the formula, k=1,2,, M is the numbering of circle territory dispenser; τ is the element duration of dpsk signal;

4. the input that is connected to M round territory dispenser with M array element output of Duffing oscillator frequently, M round territory dispenser exported the input that is connected to M DPSK demodulator, form irrelevant DPSK signal of communication chaotic oscillator detector fundamental system;

5. the output of M DPSK demodulator is got and, obtain waiting weighted data to merge signal being:

$\stackrel{\·}{s}\left(t\right)=\underset{k=1}{\overset{M}{\mathrm{\Σ}}}{\stackrel{\·}{y}}_k\left(t\right)---\left(6\right);$

6. the correlation that weighted data merges signal and the output of each DPSK demodulator such as obtain, the correlation intergal time is taken as 2-3 times of dpsk signal element duration, and correlation computations is undertaken by formula (7):

$u_k\left(t\right)={\∫}_0^{(2-3)\×\mathrm{\τ}}{\stackrel{\·}{y}}_k\left(t\right)\stackrel{\·}{s}\left(t\right)\mathrm{dt}---\left(7\right)$

In the formula, k=1,2,, M

7. maximum, the pairing DPSK demodulator output of inferior big relevant peaks are exported as the array element that is dominant, externally export via the summation operation unit of irrelevant DPSK signal of communication chaotic oscillator detector;

8. the switching of the array element that is dominant was determined by the correlation intergal time; The output of the array element that is dominant between twice switching continues gating.

Key feature of the present invention is: by with Duffing oscillator frequently, circle territory dispenser, bit delay DPSK demodulator, etc. flexible strategy constituted according to fusion device, correlation intergal array, relevant peaks finger, the array element that is dominant Strobe Controller, the array element that is dominant output summer; Have from M array element output channel with frequency Duffing oscillator, according to the relevant peaks testing result, gating presents the ability of the array element signals that is dominant of cycle track pattern automatically.When arbitrary incoherent DPSK signal of communication to be checked occurs, this incoherent DPSK signal of communication chaotic oscillator detector will directly be exported the base band data information that detects

Essence of the present invention is: utilize with Duff ing oscillator, circle territory dispenser frequently constitute M respectively with corresponding with Duffing oscillator array element frequently, as to be used to detect incoherent DPSK signal of communication phase diversity passage, and then flexible strategy such as utilization are searched technology according to fusion, correlation intergal and relevant peaks, the array element that promptly is dominant gating strategy sifts out and gating contains maximum base band data information

(having maximum and time big relevant peaks) the array element passage that is dominant, so, can reach the purpose that from incoherent DPSK signal of communication, detects base band data information in real time.

The concrete course of work of the present invention and principle are:

The first step, amplitude be no more than ± the signals and associated noises x (t) of 0.20V is converted into digital quantity via analog-digital converter (ADC), switching rate be signal carrier frequency frequency to be checked 5-12 doubly;

Second step, send into digitized x (t) in M the array element of the same frequency Duffing oscillator that resolves with the quadravalence Runge-Kutta algorithm as external signal, the mode of sending into is determined by formula (1) or formula (2), it is identical with the change over clock cycle of ADC to resolve step-length, and operation result is given round territory dispenser in real time with the form of phase path horizontal stroke, ordinate component;

In the 3rd step, round territory dispenser is handled from the data with frequency Duffing oscillator array element in real time by formula (4), delivers to bit time-delay DPSK demodulator then and carries out the dpsk signal demodulation by formula (5);

In the 4th step, execution formula (6) computing such as obtains at the weighting fused data;

In the 5th step, maximum, inferior big correlation peak are found out in execution formula (7) computing;

The 6th step, with the bit time-delay DPSK demodulator maximum, that inferior big correlation peak is corresponding, the array element that promptly is dominant passage with the summer connection, exports the base-band information that detects continuously;

The 7th step, upgrade relevant peaks and calculate, find out maximum, inferior big correlation peak, the connection that refreshes the array element passage that is dominant.

Beneficial effect of the present invention is:

1. a kind of incoherent DPSK signal of communication chaotic oscillator detector is provided, and it makes up thought to developing and enriching the incoherent DPSK digital receiver of chaotic oscillator new theory and will play the effect of laying a foundation.

2. the structure property of all having showed incoherent DPSK signal of communication chaotic oscillator detector from theory and technology two aspects, this has important directive significance to developing the incoherent DPSK digital receiver of chaotic oscillator product future.The present invention is specially adapted to detect the occasion of incoherent DPSK signal of communication.

Description of drawings

The irrelevant DPSK signal of communication of Fig. 1 chaotic oscillator detector fundamental system;

The interconnection theory diagram of the irrelevant DPSK signal of communication of Fig. 2 chaotic oscillator detector, among the figure,

Be the base band data information that detects;

The electrical schematic diagram of the incoherent DPSK signal of communication of Fig. 3 chaotic oscillator detector.

Embodiment

For example the present invention is done more detailed description below in conjunction with accompanying drawing:

In conjunction with Fig. 3, the function of present embodiment by difference amplifying unit U1, touch-number conversion unit U2, rearmounted dispensing unit U3, intelligent processing unit U4 and clock source U5 form jointly.

U1 is responsible for an input signal x (t) and is converted to differential signal; U2 is responsible for an x (t) and is converted to 14 binary digital signal, and change over clock is provided by U4, and frequency is determined according to signal to be checked; U3 is responsible for intelligent processing unit U4 rearmounted configuration is provided, and the JTAG mode is used in software download; U4 is FPGA or SOPC chip, is responsible for realizing the oscillator with frequency Duffing, and algorithm adopts VHDL language and the embedded assembler language of μ/COSII to realize; U5 is responsible for U4 system clock is provided.

The concrete parameter that present embodiment adopts is:

1.x (t) for comprising the external signal of signal to be checked and noise, the amplitude peak-to-peak value is not more than ± 0.20V.

2.A/D change over clock is 360.5MHz.

3. signal frequency to be checked is 36.05MHz.

4. with frequency Duffing vibrator model be

In the formula, M=4; K=0,1,2,3.

5. resolve the employing fourth-order Runge-Kutta method with Duffing oscillator frequently.

6. justifying territory dispenser model is

$\stackrel{\&OverBar;}{y}\left(t\right)=\left\{\begin{array}{cc}+1,& \sqrt{{\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000052618150000011.png,HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_1^2+{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2^2}>R\\ -1,& \sqrt{{\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000052618150000011.png,HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_1^2+{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2^2}\&le;R\end{array}\right.$

In the formula, k=1,2,, M; y ₁, y ₂Be array element output with frequency Duffing oscillator; R=0.99 is the radius in circle territory.

7.DPSK the demodulator model is

${\tilde{y}}_k\left(t\right)={\stackrel{\&OverBar;}{y}}_k\left(t\right)\&CircleTimes;{\stackrel{\&OverBar;}{y}}_k(t-\mathrm{\&tau;})$

In the formula, k=1,2,, M; τ is the element duration of dpsk signal.

8. wait weighted data to melt the device model to be

$\stackrel{\&CenterDot;}{s}\left(t\right)=\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)$

9. the correlator model is

$u_k\left(t\right)={\&Integral;}_0^{(2-3)\&times;\mathrm{\&tau;}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)\stackrel{\&CenterDot;}{s}\left(t\right)\mathrm{dt}$

In the formula, k=1,2,, M.

10. the array element that is dominant gating strategy

1) from M correlator output, finds out maximum, inferior big correlation peak;

2) with the DPSK demodulator maximum, that inferior big correlation peak is corresponding, the array element that promptly is dominant passage is connected with summer, and the base-band information that detects is exported continuously;

3) upgrade relevant peaks and calculate, find out maximum, inferior big correlation peak, the connection that refreshes the array element passage that is dominant.

More than be described as a kind of embodiment of the present invention, can carry out respective change according to technical scheme of the present invention.

In conjunction with Fig. 1, performing step of the present invention is:

1. the method that provides according to patent ZL200810209736.4 is chosen one and is done the same frequency Duffing oscillator of array element by M Duffing oscillator, and the state equation of array element is expressed as:

Or

In the formula, k=0,1,, M-1 is the numbering of array element k; y ₁And y ₂Output for array element; X (t)=s (t)+n (t) is ω for input external signal, s (t) for its carrier angular frequencies of dpsk signal to be checked, and n (t) is a noise, and a is that external signal is injected intensity factor; γ cos (t) represents array element k internal drive power,

Be the first phase of array element k internal drive power, that is:

In the formula, k=0,1,, M-1.

2. the method that provides according to patent ZL200710071895.8 is chosen M identical round territory dispenser, and its circle territory cut-off rule equation is provided by formula (4):

$\stackrel{\&OverBar;}{y}\left(t\right)=\left\{\begin{array}{cc}+1,& \sqrt{{\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000052618150000011.png,HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_1^2+{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2^2}>R\\ -1,& \sqrt{{\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="HDA0000052618150000011.png,HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_1^2+{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="HDA0000052618150000021.png"\; state="\{\{state\}\}">y</figure-callout>}}_2^2}\&le;R\end{array}\right.---\left(4\right)$

In the formula, y ₁, y ₂Representative is with the array element output of Duffing oscillator frequently, R be array element present the cycle during track its track neither contact the radius of a border circular areas that is positioned at its inside that does not also pass through,

The one dimension time output signal of representative circle territory dispenser.

3. the DPSK demodulation process is carried out in the output of M round territory dispenser respectively, adopt here to need not the bit delay demodulation scheme that carrier wave recovers, its Mathematical Modeling is provided by formula (5):

${\tilde{y}}_k\left(t\right)={\stackrel{\&OverBar;}{y}}_k\left(t\right)\&CircleTimes;{\stackrel{\&OverBar;}{y}}_k(t-\mathrm{\&tau;})---\left(5\right)$

In the formula, k=1,2,, M is the numbering of circle territory dispenser; τ is the element duration of dpsk signal.

4. the input that is connected to M round territory dispenser with M array element output of Duffing oscillator frequently, M round territory dispenser exported the input that is connected to M DPSK demodulator, can form irrelevant DPSK signal of communication chaotic oscillator detector fundamental system as shown in Figure 1.

5. the output of M DPSK demodulator is got and, obtain waiting weighted data to merge signal being:

$\stackrel{\&CenterDot;}{s}\left(t\right)=\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)---\left(6\right)$

6. the correlation that weighted data merges signal and the output of each DPSK demodulator such as obtain, the correlation intergal time is taken as 2-3 times of dpsk signal element duration, and correlation computations is undertaken by formula (7):

$u_k\left(t\right)={\&Integral;}_0^{(2-3)\&times;\mathrm{\&tau;}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)\stackrel{\&CenterDot;}{s}\left(t\right)\mathrm{dt}---\left(7\right)$

In the formula, k=1,2,, M.

7. maximum, the pairing DPSK demodulator output of inferior big relevant peaks are exported as the array element that is dominant, externally export via the summation operation unit of irrelevant DPSK signal of communication chaotic oscillator detector.

8. the switching of the array element that is dominant was determined by the correlation intergal time; The output of the array element that is dominant between twice switching continues gating.

The hardware system principle of incoherent DPSK signal of communication chaotic oscillator detector can be with reference to figure 2.

Claims (4)

1. incoherent DPSK signal of communication chaotic oscillator detector is characterized in that: by the difference amplifying unit, touch-the number conversion unit, rearmounted dispensing unit, intelligent processing unit and clock source connect to form; The difference amplifying unit is converted to differential signal to input signal x (t); Touch-the number conversion unit is converted to 14 binary digital signal to x (t), and change over clock is provided by intelligent processing unit, and frequency is determined according to signal to be checked; Rearmounted dispensing unit provides rearmounted configuration for intelligent processing unit; Intelligent processing unit is FPGA or SOPC chip, realizes the oscillator with frequency Duffing; The clock source provides system clock for intelligent processing unit.

2. incoherent DPSK signal of communication chaotic oscillator detector according to claim 1 is characterized in that: described x (t) is for comprising the external signal of signal to be checked and noise, and the amplitude peak-to-peak value is not more than ± 0.20V.

3. the construction method of an incoherent DPSK signal of communication chaotic oscillator detector, it is characterized in that: utilize with Duffing oscillator, circle territory dispenser frequently constitute M respectively with corresponding with Duffing oscillator array element frequently, as to be used to detect incoherent DPSK signal of communication phase diversity passage, and then flexible strategy such as utilization search technology according to fusion, correlation intergal and relevant peaks, sift out and gating contains maximum base band data information

The array element passage that is dominant, reach the purpose that from incoherent DPSK signal of communication, detects base band data information in real time.

4. the construction method of incoherent DPSK signal of communication chaotic oscillator detector according to claim 3 is characterized in that specifically comprising the steps:

(1). choose one and do the same frequency Duffing oscillator of array element by M Duffing oscillator, the state equation of array element is expressed as:

Or

In the formula, k=0,1,, M-1 is the numbering of array element k; y ₁And y ₂Output for array element; X (t)=s (t)+n (t) is ω for input external signal, s (t) for its carrier angular frequencies of dpsk signal to be checked, and n (t) is a noise, and a is that external signal is injected intensity factor; γ cos (t) represents array element k internal drive power,

Be the first phase of array element k internal drive power, that is:

In the formula, k=0,1,, M-1;

(2). choose M identical round territory dispenser, its circle territory cut-off rule equation is provided by formula (4):

$\stackrel{\&OverBar;}{y}\left(t\right)=\left\{\begin{array}{cc}+1,& \sqrt{y_1^2+y_2^2}>R\\ -1,& \sqrt{y_1^2+y_2^2}\&le;R\end{array}\right.---\left(4\right)$

In the formula, y ₁, y ₂Representative is with the array element output of Duffing oscillator frequently, R be array element present the cycle during track its track neither contact the radius of a border circular areas that is positioned at its inside that does not also pass through,

The one dimension time output signal of representative circle territory dispenser;

(3). the DPSK demodulation process is carried out in the output to M round territory dispenser respectively, adopts to need not the bit delay demodulation scheme that carrier wave recovers, and its Mathematical Modeling is provided by formula (5):

${\tilde{y}}_k\left(t\right)={\stackrel{\&OverBar;}{y}}_k\left(t\right)\&CircleTimes;{\stackrel{\&OverBar;}{y}}_k(t-\mathrm{\&tau;})---\left(5\right)$

In the formula, k=1,2,, M is the numbering of circle territory dispenser; τ is the element duration of dpsk signal;

(4). the input that is connected to M round territory dispenser with M array element output of Duffing oscillator frequently, M round territory dispenser exported the input that is connected to M DPSK demodulator, form irrelevant DPSK signal of communication chaotic oscillator detector fundamental system;

(5). the output of M DPSK demodulator got and, obtain waiting weighted data to merge signal being:

$\stackrel{\&CenterDot;}{s}\left(t\right)=\underset{k=1}{\overset{M}{\mathrm{\&Sigma;}}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)---\left(6\right);$

(6). the correlation that weighted data merges signal and the output of each DPSK demodulator such as obtain, the correlation intergal time is taken as 2-3 times of dpsk signal element duration, and correlation computations is undertaken by formula (7):

$u_k\left(t\right)={\&Integral;}_0^{(2-3)\&times;\mathrm{\&tau;}}{\stackrel{\&CenterDot;}{y}}_k\left(t\right)\stackrel{\&CenterDot;}{s}\left(t\right)\mathrm{dt}---\left(7\right)$

In the formula, k=1,2,, M;

(7). maximum, the pairing DPSK demodulator output of inferior big relevant peaks are exported as the array element that is dominant, externally export via the summation operation unit of irrelevant DPSK signal of communication chaotic oscillator detector;

(8). the switching of the array element that is dominant was determined by the correlation intergal time; The output of the array element that is dominant between twice switching continues gating.

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