CN105549000A - Usage method of harmonic radar with positioning function - Google Patents

Abstract

The invention provides a usage method of a harmonic radar with a positioning function. The method comprises the steps of: carrying out nonequilibrium quadrature phase code modulation on an adopted pseudo random codebook sequence, and further modulating the phase of a carrier generation signal and generating a harmonic radar emission signal; carrying out band-pass filtering, carrier mixed frequency removing from harmonic frequency, and low-pass filtering on a received non-linear target reradiation harmonic frequency signal, and obtaining a harmonic baseband signal; carrying out two-phase coded modulation on the adopted pseudo random codebook sequence, and generating a local two-phase coded baseband signal; carrying out cross correlation operation on the harmonic baseband signal and the local two-phase coded baseband signal, carrying out peak value searching and threshold decision on a calculation result, carrying out detection on corresponding target time delay information, calculating the corresponding distance position information according to the target time delay information, further generating detection information, and coding and outputting the detection information. The usage method of the harmonic radar with the positioning function has the advantages that the detection sensitivity is high, the interference resistance is high, and high-precision positioning is realized.

Description

There is the using method of the harmonic radar of positioning function

Technical field

The present invention relates near field Nonlinear Parameter harmonic radar Detection Techniques, particularly, relate to a kind of using method with the harmonic radar of positioning function adopting broadband non-equilibrium orthogonal pseudo-random encoding phase modulation signal and digital pulse-compression.

Background technology

Existing harmonic radar technology mainly adopts narrow band signal system, operationally launch one or more single-frequency signals, can the harmonic wave that makes new advances of radiation or combination harmonic signal again after this signal is irradiated to Nonlinear Parameter, detected the size of radiation signal energy again at receiving end by the mode of narrow-band demodulation, time integral, realize the detection of Nonlinear Parameter, the radar principle of work of this system is clear, realize simple, can realize compromising flexibly between detection time and detection sensitivity, application is better.

But along with the continuous expansion of the current application of harmonic radar, around acquisition environment, electromagnetic radiation environment becomes increasingly complex, the continuous change of the more and more advanced and material structure of the technique of Nonlinear Parameter, conventional harmonic radar can face following problem when practical application:

1, detection sensitivity is inadequate, is specially, and conventional harmonic radar relies on to reduce channel bandwidth and strengthen accumulated time width to reach the target improving its detection sensitivity, and this signal system itself does not possess processing gain, is difficult to improve system sensitivity further.

2, electromagnetism interference poor performance, is specially, and equally due to its narrow-band reception feature, this radar self cannot distinguish the echoing characteristics of various undesired signal and echo signal, and while raising detection sensitivity, its electromagnetism interference performance also can become poorer.Frequency of utilization system of selection can avoid the impact of the deterministic electromagnetic interference signal of part, but adopts this working method None-identified random electromagnetic undesired signal and impulse noise interference signal.

3, there is no target localization resolution characteristic, further expand application limited.

Summary of the invention

For defect of the prior art, the object of this invention is to provide a kind of harmonic radar with positioning function adopting broadband non-equilibrium orthogonal pseudo-random encoding phase modulation signal and digital pulse-compression, there is better detection sensitivity and electromagnetism interference performance, high precision distance can be realized to location, thus the application scope of harmonic radar can be further expanded.

According to the using method with the harmonic radar of positioning function provided by the invention, comprise the steps:

Step S1: non-equilibrium quadrature phase coded modulation is carried out to adopted pseudorandom code book sequence, so phase place carrier wave being produced signal carry out modulation generate harmonic radar transmit;

Step S2: radiate harmonic frequency signal carries out bandpass filtering again, harmonic frequency unloads wave mixing and low-pass filtering treatment to the Nonlinear Parameter received, and obtains harmonic wave baseband signal;

Step S3: biphase coding modulation is carried out to adopted pseudorandom code book sequence, produces local biphase coding baseband signal;

Step S4: computing cross-correlation is carried out to described harmonic wave baseband signal and local biphase coding baseband signal, and the target latency information that result of calculation carries out peak value searching, threshold judgement and correspondence is detected, judge the presence or absence of target, and calculate the distance and position information corresponding to it according to described target latency information, and then generate Detection Information and coding output is carried out to Detection Information.

Preferably, described step S1 is specially: to adopted pseudorandom 0,1} code book sequence carries out non-equilibrium quadrature phase coded modulation, and then phase place carrier wave being produced signal corresponds to according to 0 correspondence 0,1 pE system carry out modulation generate harmonic radar transmit.

Preferably, described step S3 is specially: to adopted pseudorandom 0,1} code book sequence corresponds to 0,1 PE system corresponding to π according to 0 and carries out the modulation of BPSK biphase coding, produces local biphase coding baseband signal.

Preferably, the I that transmits of the harmonic radar in a complete cycle is:

$I=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\right(w_{1}t+\mathrm{\&pi;}P\left(i\right)/2\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(1\right)$

Wherein, N is pseudorandom code book quantity, P (i) be 0,1} pseudorandom code book, T _rfor symbol width, w ₁for modulated carriers, i is pulse numbering, and j is imaginary unit, and t is the time.

Preferably, harmonic wave baseband signal I ₁for:

$I_1=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\mathrm{\&pi;}p\right(i\left)\right)+N_0\left(t\right),0<t<{\mathrm{NT}}_r\\ N_0\left(t\right),t>{\mathrm{NT}}_r\end{array}\right.---\left(2\right)$

Wherein, N ₀t () is noise.

Preferably, local biphase coding baseband signal T _i:

$T_i=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j2\mathrm{\&pi;}\right(0.5-P\left(i\right)\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(3\right)$

Preferably, by local biphase coding baseband signal T _iwith harmonic wave baseband signal I ₁carry out computing cross-correlation, namely

$R=T_i\&CircleTimes;I_1---\left(4\right)$

In formula, symbol represent related operation, peak value searching, threshold judgement and target latency information are carried out with the effective detection and positioning to Nonlinear Parameter to result of calculation R.

Compared with prior art, the present invention has following beneficial effect:

1, present invention employs the non-equilibrium quadrature phase coded modulation in broadband and pulse compression technique, the harmonic radar therefore utilizing the present invention to be formed has the advantage that detection sensitivity is high, antijamming capability strong and can realize hi-Fix;

2, in the present invention, harmonic radar has better detection sensitivity and electromagnetism interference performance simultaneously, can realize high precision distance to location, thus can further expand the application scope of harmonic radar.

Accompanying drawing explanation

By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:

Fig. 1 is FB(flow block) of the present invention;

Fig. 2 to transmit non-equilibrium orthogonal pseudo-random encoding phase modulation constellation schematic diagram for harmonic radar that the embodiment of the present invention provides;

Fig. 3 is the receiving end local BPSK pseudorandomcode phase-modulation constellation schematic diagram that the embodiment of the present invention provides.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.

In the present embodiment, the using method with the harmonic radar of positioning function provided by the invention, comprises the steps:

Step S1: non-equilibrium quadrature phase coded modulation is carried out to adopted pseudorandom code book sequence, so phase place carrier wave being produced signal carry out modulation generate harmonic radar transmit;

Step S2: radiate harmonic frequency signal carries out bandpass filtering again, harmonic frequency unloads wave mixing and low-pass filtering treatment to the Nonlinear Parameter received, and obtains harmonic wave baseband signal;

Step S3: biphase coding modulation is carried out to adopted pseudorandom code book sequence, produces local biphase coding baseband signal;

Step S4: computing cross-correlation is carried out to described harmonic wave baseband signal and local biphase coding baseband signal, and the target latency information that result of calculation carries out peak value searching, threshold judgement and correspondence is detected, judge the presence or absence of target, and calculate the distance and position information corresponding to it according to described target latency information, and then generate Detection Information and coding output is carried out to Detection Information.

Described step S1 is specially: to adopted pseudorandom 0,1} code book sequence carries out non-equilibrium quadrature phase coded modulation, and then phase place carrier wave being produced signal corresponds to according to 0 correspondence 0,1 pE system carry out modulation generate harmonic radar transmit, as shown in Figure 2.

Described step S3 is specially: to adopted pseudorandom 0,1} code book sequence corresponds to 0,1 PE system corresponding to π according to 0 and carries out the modulation of BPSK biphase coding, produces local biphase coding baseband signal, as shown in Figure 3.

Harmonic radar in the complete cycle I that transmits is:

$I=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\right(w_{1}t+\mathrm{\&pi;}P\left(i\right)/2\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(1\right)$

Wherein, N is pseudorandom code book quantity, P (i) be 0,1} pseudorandom code book, T _rfor symbol width, w ₁for modulated carriers, i is pulse numbering, and j is imaginary unit, and t is the time;

Described harmonic wave baseband signal I ₁for:

$I_1=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\mathrm{\&pi;}p\right(i\left)\right)+N_0\left(t\right),0<t<{\mathrm{NT}}_r\\ N_0\left(t\right),t>{\mathrm{NT}}_r\end{array}\right.---\left(2\right)$

Wherein, N ₀t () is noise.

Local biphase coding baseband signal T _i:

$T_i=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j2\mathrm{\&pi;}\right(0.5-P\left(i\right)\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(3\right)$

By local biphase coding baseband signal T _iwith harmonic wave baseband signal I ₁carry out computing cross-correlation, namely

$R=T_i\&CircleTimes;I_1---\left(4\right)$

In formula represent related operation, effective detection and positioning that peak value searching, threshold judgement and target latency information just can realize Nonlinear Parameter is carried out to result of calculation R.

Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (7)

1. there is a using method for the harmonic radar of positioning function, it is characterized in that, comprise the steps:

Step S1: non-equilibrium quadrature phase coded modulation is carried out to adopted pseudorandom code book sequence, so phase place carrier wave being produced signal carry out modulation generate harmonic radar transmit;

Step S2: radiate harmonic frequency signal carries out bandpass filtering again, harmonic frequency unloads wave mixing and low-pass filtering treatment to the Nonlinear Parameter received, and obtains harmonic wave baseband signal;

Step S3: biphase coding modulation is carried out to adopted pseudorandom code book sequence, produces local biphase coding baseband signal;

Step S4: computing cross-correlation is carried out to described harmonic wave baseband signal and local biphase coding baseband signal, and the target latency information that result of calculation carries out peak value searching, threshold judgement and correspondence is detected, judge the presence or absence of target, and calculate the distance and position information corresponding to it according to described target latency information, and then generate Detection Information and coding output is carried out to Detection Information.

2. the using method with the harmonic radar of positioning function according to claim 1, it is characterized in that, described step S1 is specially: to adopted pseudorandom 0,1} code book sequence carries out non-equilibrium quadrature phase coded modulation, and then phase place carrier wave being produced signal corresponds to according to 0 correspondence 0,1 pE system carry out modulation generate harmonic radar transmit.

3. the using method with the harmonic radar of positioning function according to claim 1, it is characterized in that, described step S3 is specially: to adopted pseudorandom 0,1} code book sequence corresponds to 0,1 PE system corresponding to π according to 0 and carries out the modulation of BPSK biphase coding, produces local biphase coding baseband signal.

4. the using method with the harmonic radar of positioning function according to claim 1, is characterized in that, the I that transmits of the harmonic radar in a complete cycle is:

$I=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\right(w_{1}t+\mathrm{\&pi;}P\left(i\right)/2\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(1\right)$

Wherein, N is pseudorandom code book quantity, P (i) be 0,1} pseudorandom code book, T _rfor symbol width, w ₁for modulated carriers, i is pulse numbering, and j is imaginary unit, and t is the time.

5. the using method with the harmonic radar of positioning function according to claim 4, is characterized in that, harmonic wave baseband signal I ₁for:

$I_1=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j\mathrm{\&pi;}p\right(i\left)\right)+N_0\left(t\right),0<t<{\mathrm{NT}}_r\\ N_0\left(t\right),t>{\mathrm{NT}}_r\end{array}\right.---\left(2\right)$

Wherein, N ₀t () is noise.

6. the using method with the harmonic radar of positioning function according to claim 5, is characterized in that, local biphase coding baseband signal T _i:

$T_i=\left\{\begin{array}{c}\underset{i=0}{\overset{N-1}{\&Sigma;}}rect(t-{\mathrm{iT}}_r)*\exp \left(j2\mathrm{\&pi;}\right(0.5-P\left(i\right)\left)\right),0<t<{\mathrm{NT}}_r\\ 0,t>{\mathrm{NT}}_r\end{array}\right.---\left(3\right)$

7. the using method with the harmonic radar of positioning function according to claim 6, is characterized in that, by local biphase coding baseband signal T _iwith harmonic wave baseband signal I ₁carry out computing cross-correlation, namely

$R=T_i\&CircleTimes;I_1---\left(4\right)$

In formula, symbol represent related operation, peak value searching, threshold judgement and target latency information are carried out with the effective detection and positioning to Nonlinear Parameter to result of calculation R.