CN102998659B - Doppler frequency spectrum shaping method and system based on interpulse modulation - Google Patents
Doppler frequency spectrum shaping method and system based on interpulse modulation Download PDFInfo
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- CN102998659B CN102998659B CN201210521198.9A CN201210521198A CN102998659B CN 102998659 B CN102998659 B CN 102998659B CN 201210521198 A CN201210521198 A CN 201210521198A CN 102998659 B CN102998659 B CN 102998659B
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Abstract
The invention provides a Doppler frequency spectrum shaping method and system based on interpulse modulation. The method comprises the following steps: generating a transmission pulse through a waveform generator and determining a Doppler frequency spectrum shaping function of the transmission pulse; performing interpulse modulation on the transmission pulse according to the Doppler frequency spectrum shaping function to generate a modulation pulse; receiving the modulation pulse (echo signals) and performing digital sampling; and performing interpulse fast Fourier transform on the modulation pulse obtained by sampling so as to obtain a shaping Doppler frequency spectrum. According to the method of an embodiment, the radar anti-jamming performance can be improved by shaping the transmission pulse Doppler frequency spectrum, and a novel technical approach is provided for orthogonal waveform separation of a multi-transmitting and multi-receiving radar system.
Description
Technical field
The present invention relates to radar signal processing field, particularly a kind of Doppler frequency spectrum shaping method and system based on modulating between arteries and veins.
Background technology
Radar has the good characteristics such as round-the-clock, round-the-clock, penetrability, in civilian and military fields such as navigation, remote sensing, mapping, scouting, warning, fire control, has a wide range of applications.But one side is along with electromagnetic environment is complicated, and especially the application of cheating interference, has proposed requirements at the higher level to anti-jamming ability of radar; On the other hand, appearance along with new technology new system radar detection system, as multiple-input and multiple-output synthetic-aperture radar (Multiple Input Multiple Output Synthetic Aperture Radar, be called for short MIMO-SAR) system etc., the new problem facing has proposed active demand to signal processing method.
For this reason, field of radar has proposed the slow time dimension of digging utilization, and the information of Doppler domain improves many effective ways of radar performance.As utilize the transient state Doppler effect of moving target in short relevant processing interval (CoherentProcessing Interval is called for short CPI), adopt moving-target to detect (MotiveTarget Detector is called for short MTD) method.Radar is placed on mobile platform, utilizes spatial sampling to be equivalent to the thought of time-sampling, at slow time dimension, carry out long coherence processing, obtain the synthetic aperture method of search coverage full resolution pricture.Along with lifting military, civilian demand, meet wide swath high-resolution (High Resolution Wide Swath, be called for short HRWS) need and improve system ground moving target to show (Ground Moving Target Indication, be called for short GMTI), many New System new technology SAR systems are proposed, if orientation is to multiple aperture SAR, Range multi-aperture SAR, MIMO-SAR etc.
Yet no matter coherent pulse radar, for the utilization of slow time dimension Doppler domain information, is relevant processing or long-time relevant processing of short time at present, is all the doppler spectral based on original.Under present complex electromagnetic environment background, cheating interference has become a kind of novel potential threat of obscuring radar intelligence (RADINT).Existing main employing complicated wave form design, working frequency points be prompt to be become, the repetition period is irregular, the method such as rotation speed change everyday, and considers seldom at slow time dimension Doppler domain.In long-time coherent accumulation is processed, the appearance of New System new technology SAR system, proposes requirements at the higher level to the utilization of target information.MIMO-SAR system, because can utilize transmit diversity and receive diversity to obtain more degree of freedom, becomes the hot research of current field of radar.But the orthogonality that its requirement transmits will be got well, this has greatly limited its practicalization.Orthogonal waveforms is generally divided into two classes: frequency division orthogonal waveforms and code minute orthogonal waveforms.At present, research focuses mostly at frequency division orthogonal waveforms, and divides orthogonal waveforms because simple crosscorrelation is non-vanishing in reality with frequency code, and in long-time coherent accumulation, meeting produces simple crosscorrelation noise, and reduction picture quality is difficult to practical.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For achieving the above object, the embodiment of one aspect of the present invention proposes a kind of Doppler frequency spectrum shaping method based on modulating between arteries and veins, comprises the following steps: S1: by waveform generator, produced transponder pulse and determined described exomonental Doppler frequency spectrum figuration function; S2: carry out modulation between arteries and veins to described transponder pulse according to described Doppler frequency spectrum figuration function and generate modulating pulse; S3: receive described modulating pulse and described modulating pulse is sampled; And S4: the modulating pulse that described sampling is obtained is carried out Fast Fourier Transform (FFT) between arteries and veins and obtained figuration Doppler frequency spectrum.
According to the method for the embodiment of the present invention, by transponder pulse is carried out to Doppler frequency spectrum figuration, can improve the interference free performance of radar, the separation for multi-emitting waveform radar system orthogonal waveforms simultaneously provides new technological approaches.
In one embodiment of the present of invention, described how general frequency spectrum figuration function is, A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) expression spectrum amplitude figuration function.
In one embodiment of the present of invention, between described arteries and veins, modulation is modulated by following formula: s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, t represents the fast time.
In one embodiment of the present of invention, A (t in described modulating function
m) and θ (t
m) be independent variable t
marbitrary function.
In one embodiment of the present of invention, described p (t) is the stack ripple of single waveform or a plurality of waveforms, and its expression formula is as follows:
wherein, N
tthe number that represents radar system transmitted waveform.
In one embodiment of the present of invention, described function A (t
m) and θ (t
m) to different transmitted waveforms, be different, i.e. p
i(t) corresponding modulating function is A
i(t
m) and θ
i(t
m).
In one embodiment of the present of invention, described figuration Doppler frequency spectrum is limited spectrum width, and meets following relation:
wherein, B
arepresent to modulate the signal spectrum spectrum width before Doppler frequency spectrum figuration, f between arteries and veins
pRFthe indicating impulse repetition period.
For achieving the above object, embodiments of the invention propose a kind of Doppler frequency spectrum shaping system based on modulating between arteries and veins on the other hand, comprise: determine function module, for producing transponder pulse by waveform generator and determining described exomonental Doppler frequency spectrum figuration function; Modulation module, generates modulating pulse for carrying out modulation between arteries and veins to according to described Doppler frequency spectrum figuration function described transponder pulse; Sampling module, for receiving described modulating pulse and described modulating pulse being sampled; And conversion module, for the modulating pulse that described sampling is obtained, carry out Fast Fourier Transform (FFT) between arteries and veins and obtain figuration Doppler frequency spectrum.
According to the system of the embodiment of the present invention, by determine Doppler frequency spectrum figuration function for transponder pulse, thereby improved the interference free performance of radar, the separation for multi-emitting waveform radar system orthogonal waveforms simultaneously provides new technological approaches.
In one embodiment of the present of invention, the how general frequency spectrum figuration function of described definite function module is, A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) expression spectrum amplitude figuration function.
In one embodiment of the present of invention, described modulation module is modulated by following formula: s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, t represents the fast time.
In one embodiment of the present of invention, A (t in described modulating function
m) and θ (t
m) be independent variable t
marbitrary function.
In one embodiment of the present of invention, described p (t) is the stack ripple of single waveform or a plurality of waveforms, and its expression formula is as follows:
wherein, N
tthe number that represents radar system transmitted waveform.
In one embodiment of the present of invention, described function A (t
m) and θ (t
m) to different transmitted waveforms, be different, i.e. p
i(t) corresponding modulating function is A
i(t
m) and θ
i(t
m).
In one embodiment of the present of invention, described figuration Doppler frequency spectrum is limited spectrum width, and meets following relation:
wherein, B
arepresent to modulate the signal spectrum spectrum width before Doppler frequency spectrum figuration, f between arteries and veins
pRFthe indicating impulse repetition period.
The aspect that the present invention is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein:
Fig. 1 is the process flow diagram of the Doppler frequency spectrum shaping method based on modulating between arteries and veins according to an embodiment of the invention;
The Doppler frequency spectrum figure of Fig. 2 when not doing according to an embodiment of the invention to modulate between arteries and veins;
Fig. 3 is the Doppler frequency spectrum figure after modulating between arteries and veins according to an embodiment of the invention; And
Fig. 4 is the frame diagram of the Doppler frequency spectrum shaping system based on modulating between arteries and veins according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " first ", " second ", " the 3rd " be only for describing object, and can not be interpreted as indication or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ", " the 3rd ".In description of the invention, the implication of " a plurality of " is two or more, unless otherwise expressly limited specifically.
Fig. 1 is the process flow diagram of the Doppler frequency spectrum shaping method based on modulating between arteries and veins of the embodiment of the present invention.As shown in Figure 1, the Doppler frequency spectrum shaping method based on modulating between arteries and veins according to the embodiment of the present invention, comprises the following steps:
Step S101, is produced transponder pulse and is determined exomonental Doppler frequency spectrum figuration function by waveform generator.
Particularly, determine Doppler frequency spectrum figuration function A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) and θ (t
m) be independent variable t
marbitrary function.。For different transmitted waveforms, select different modulating function, i.e. N
tplant transmitted waveform, with regard to corresponding N
tplant modulating function, can be expressed as: A
i(t
m) exp (j θ
i(t
m)), i=1,2 ..., N
t.
In an embodiment of the present invention, radar parameter is: signal bandwidth B=80MHz, radar repetition frequency f
pRF=2000Hz, platform speed V
s=120m/s is single transmit waveform list receiving system, i.e. N
t=1, N
r=1 antenna aperture is 1 meter.In experiment, the shortest oblique distance of point target setting and platform is 4000 meters.When monophasic waveform, select a kind of modulating function, get A (t
m)=1, does not make amplitude figuration, gets f
a=200Hz, θ (t
m) getting once linear function, with formula, can be expressed as: θ (t
m)=2 π f
at
m=400 π t
m.Above-mentioned formula represents modulating function between arteries and veins, and the centre frequency that realizes Doppler frequency spectrum is moved to 200Hz.
Step S102, carries out modulation between arteries and veins according to Doppler frequency spectrum figuration function to transponder pulse and generates modulating pulse.
Particularly, each transponder pulse is carried out modulating between arteries and veins according to how general frequency spectrum figuration function, be shown below: s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, and t represents the fast time, and the pulse repetition time is.For multi-emitting waveform, p (t) can be expressed as again:
thereby between multi-emitting waveform arteries and veins, modulation can be expressed as:
In one embodiment of the invention, according to above-mentioned result of calculation, each transponder pulse being carried out to modulation between arteries and veins according to how general frequency spectrum figuration function can be expressed as, s (t)=p (t) exp (j400 π t
m).
Wherein, p (t) selects chirp, and t represents the fast time, and the pulse repetition time is f
pRF=2000Hz, pulse width is T
p=10 μ s.According to above-mentioned selected parameter, can be expressed as:
Wherein, rect (x) represents rectangular function.
Step S103, receives modulating pulse and modulating pulse is sampled.
Particularly, received pulse is sampled one by one.Wherein, k, k=1,2,3..., the echoed signal of the target of receiving cable is shown below:
Wherein, a
k(t) amplitude modulation(PAM) by k received beam directional diagram, signal being brought, λ represents carrier wavelength.R
k, i(t) represent i emitter range-to-go and target to the distance between k receiving trap with.After collection, collected pulse is preserved.Step S104, the modulating pulse that sampling is obtained is carried out Fast Fourier Transform (FFT) between arteries and veins and is obtained figuration Doppler frequency spectrum.
Particularly, the received pulse of sampling is done to Fast Fourier Transform (FFT) between arteries and veins (Fast FourierTransform is called for short FFT), obtain figuration Doppler frequency spectrum.With formula, can be expressed as follows:
Wherein, S
a(t, f) represents that the different fast time do not do the distance-Doppler territory frequency spectrum while modulating between arteries and veins.
The Doppler frequency spectrum figure of Fig. 2 when not doing according to an embodiment of the invention to modulate between arteries and veins.Fig. 3 is the Doppler frequency spectrum figure after modulating between arteries and veins according to an embodiment of the invention.As shown in Figures 2 and 3, through the experiment parameter of the embodiment of the present invention and modulating function, carry out between arteries and veins, after modulation, successfully the center frequency point of Doppler frequency spectrum being moved to f from 0Hz
a=200Hz place.
According to the method for the embodiment of the present invention, by determine Doppler frequency spectrum figuration function for transponder pulse, can improve the interference free performance of radar, the separation for multi-emitting waveform radar system orthogonal waveforms simultaneously provides new technological approaches.
Fig. 4 is the frame diagram of the Doppler frequency spectrum shaping system based on modulating between arteries and veins according to an embodiment of the invention.As shown in Figure 3, according to the Doppler frequency spectrum shaping system based on modulating between arteries and veins of the embodiment of the present invention, comprise and determine function module 100, modulation module 200, sampling module 300 and conversion module 400.
Particularly, determine that function module 100 is for producing transponder pulse and determining exomonental Doppler frequency spectrum figuration function by waveform generator.
Determine Doppler frequency spectrum figuration function A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) and θ (t
m) be independent variable t
marbitrary function.For different transmitted waveforms, select different modulating function, i.e. N
tplant transmitted waveform, with regard to corresponding N
tplant modulating function, can be expressed as: A
i(t
m) exp (j θ
i(t
m)), i=1,2 ..., N
t.
In an embodiment of the present invention, radar parameter is: signal bandwidth B=80MHz, radar repetition frequency f
pRF=2000Hz, platform speed V
s=120m/s is single transmit waveform list receiving system, i.e. N
t=1, N
r=1 antenna aperture is 1 meter.In experiment, the shortest oblique distance of point target setting and platform is 4000 meters.When monophasic waveform, select a kind of modulating function, get A (t
m)=1, does not make amplitude figuration, gets f
a=200Hz, θ (t
m) getting once linear function, with formula, can be expressed as: θ (t
m)=2 π f
at
m=400 π t
m.Above-mentioned formula represents modulating function between arteries and veins, and the centre frequency that realizes Doppler frequency spectrum is moved to 200Hz.
Modulation module 200 generates modulating pulse for carrying out modulation between arteries and veins according to Doppler frequency spectrum figuration function to transponder pulse.
Each transponder pulse is carried out modulating between arteries and veins according to how general frequency spectrum figuration function, be shown below: s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, and t represents the fast time, and the pulse repetition time is.For multi-emitting waveform, p (t) can be expressed as again:
thereby between multi-emitting waveform arteries and veins, modulation can be expressed as:
In one embodiment of the invention, according to above-mentioned result of calculation, each transponder pulse being carried out to modulation between arteries and veins according to how general frequency spectrum figuration function can be expressed as, s (t)=p (t) exp (j400 π t
m).
Wherein, p (t) selects chirp, and t represents the fast time, and the pulse repetition time is f
pRF=2000Hz, pulse width is T
p=10 μ s.According to above-mentioned selected parameter, can be expressed as:
Wherein, rect (x) represents rectangular function.
Sampling module 300 is for receiving modulating pulse and modulating pulse being sampled.
Received pulse is sampled one by one.Wherein, k, k=1,2,3..., the echoed signal of the target of receiving cable is shown below:
Wherein, a
k(t) amplitude modulation(PAM) by k received beam directional diagram, signal being brought, λ represents carrier wavelength.R
k, i(t) represent i emitter range-to-go and target to the distance between k receiving trap with.After collection, collected pulse is preserved.
Conversion module 400 carries out Fast Fourier Transform (FFT) between arteries and veins for the modulating pulse that sampling is obtained and obtains figuration Doppler frequency spectrum.
The received pulse of sampling is done to Fast Fourier Transform (FFT) between arteries and veins (Fast Fourier Transform is called for short FFT), obtain figuration Doppler frequency spectrum.With formula, can be expressed as follows:
Wherein, S
a(t, f) represents that the different fast time do not do the distance-Doppler territory frequency spectrum while modulating between arteries and veins.
According to the system of the embodiment of the present invention, by determine Doppler frequency spectrum figuration function for transponder pulse, thereby improved the interference free performance of radar, the separation for multi-emitting waveform radar system orthogonal waveforms simultaneously provides new technological approaches.
Should be appreciated that specific operation process in embodiment of the method for the present invention can be identical with the description of modules in system embodiment and unit, is not described in detail herein.
Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, those of ordinary skill in the art can change above-described embodiment within the scope of the invention in the situation that not departing from principle of the present invention and aim, modification, replacement and modification.
Claims (8)
1. the Doppler frequency spectrum shaping method based on modulating between arteries and veins, is characterized in that, comprises the following steps:
S1: produced transponder pulse and determined described exomonental Doppler frequency spectrum figuration function by waveform generator, described how general frequency spectrum figuration function is, A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) expression spectrum amplitude figuration function;
S2: carry out modulation between arteries and veins to described transponder pulse according to described Doppler frequency spectrum figuration function and generate modulating pulse, between described arteries and veins, modulation is modulated by following formula, s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, t represents the fast time;
S3: receive described modulating pulse and described modulating pulse is sampled; And
S4: the modulating pulse that described sampling is obtained is carried out Fast Fourier Transform (FFT) between arteries and veins and obtained figuration Doppler frequency spectrum,
Wherein, described function A (t
m) and θ (t
m) different to different transmitted waveforms, with p
i(t) corresponding modulating function is A
i(t
m) and θ
i(t
m).
2. the Doppler frequency spectrum shaping method based on modulating between arteries and veins as claimed in claim 1, is characterized in that, A (t in described modulating function
m) and θ (t
m) be independent variable t
marbitrary function.
3. the Doppler frequency spectrum shaping method based on modulating between arteries and veins as claimed in claim 1, is characterized in that, described p (t) is the stack ripple of single waveform or a plurality of waveforms, and its expression formula is as follows:
Wherein, N
tthe number that represents radar system transmitted waveform.
4. the Doppler frequency spectrum shaping method based on modulating between arteries and veins as claimed in claim 1, is characterized in that, described figuration Doppler frequency spectrum is limited spectrum width, and meets following relation:
Wherein, B
arepresent to modulate the signal spectrum spectrum width before Doppler frequency spectrum figuration, f between arteries and veins
pRFthe indicating impulse repetition period.
5. the Doppler frequency spectrum shaping system based on modulating between arteries and veins, is characterized in that, comprising:
Determine function module, for producing transponder pulse by waveform generator and determining described exomonental Doppler frequency spectrum figuration function, the how general frequency spectrum figuration function of described definite function module is, A (t
m) exp (j θ (t
m)), wherein, t
mrepresent the slow time, m is expressed as m cycle in recurrent interval, A (t
m) expression spectrum amplitude figuration function;
Modulation module, generates modulating pulse for carrying out modulation between arteries and veins to according to described Doppler frequency spectrum figuration function described transponder pulse, and described modulation module is modulated by following formula, s (t)=p (t) A (t
m) exp (j θ (t
m)), wherein, p (t) represents transmitting pulse waveform, t represents the fast time;
Sampling module, for receiving described modulating pulse and described modulating pulse being sampled; And
Conversion module, carries out Fast Fourier Transform (FFT) between arteries and veins for the modulating pulse that described sampling is obtained and obtains figuration Doppler frequency spectrum,
Wherein, described function A (t
m) and θ (t
m) different to different transmitted waveforms, with p
i(t) corresponding modulating function is A
i(t
m) and θ
i(t
m).
6. the Doppler frequency spectrum shaping system based on modulating between arteries and veins as claimed in claim 5, is characterized in that, A (t in described modulating function
m) and θ (t
m) be independent variable t
marbitrary function.
7. the Doppler frequency spectrum shaping system based on modulating between arteries and veins as claimed in claim 5, is characterized in that, described p (t) is the stack ripple of single waveform or a plurality of waveforms, and its expression formula is as follows:
Wherein, N
tthe number that represents radar system transmitted waveform.
8. the Doppler frequency spectrum shaping system based on modulating between arteries and veins as claimed in claim 5, is characterized in that, described figuration Doppler frequency spectrum is limited spectrum width, and meets following relation:
Wherein, B
arepresent to modulate the signal spectrum spectrum width before Doppler frequency spectrum figuration, f between arteries and veins
pRFthe indicating impulse repetition period.
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| CN104836768A (en) * | 2015-04-21 | 2015-08-12 | 大连理工大学 | OFDM-based coherent MIMO radar orthogonal waveform design method |
| CN113640752B (en) * | 2021-07-13 | 2023-10-20 | 北京理工大学 | Waveform design method based on inter-pulse phase frequency spectrum double agility |
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| US7142153B2 (en) * | 2004-06-08 | 2006-11-28 | Raytheon Company | Short pulse/stepped frequency radar system |
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