CN109818681A - The MIMO radar detection method and device being multiplexed based on double frequency combs and difference frequency - Google Patents
The MIMO radar detection method and device being multiplexed based on double frequency combs and difference frequency Download PDFInfo
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Abstract
The invention discloses a kind of MIMO radar detection methods being multiplexed based on double frequency combs and difference frequency.The method of the present invention generates the road the M modulated optical signal of transmitting terminal by the following method: light carrier being divided into upper and lower two-way first by improving to the existing MIMO radar Detection Techniques based on the orthogonal difference frequency multiplexing of microwave photon；Processing is modulated to upper road light carrier with local oscillation signal, generates the first frequency comb signal, processing is modulated to lower road light carrier with intermediate-freuqncy signal and intermediate frequency (IF) Linear FM signal, generates the second frequency comb signal；After first frequency comb signal and the second frequency comb signal are coupled as all the way, the road the M modulated optical signal being made of respectively single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line is divided by beam-shaping filtering.The invention also discloses a kind of MIMO radar detection devices being multiplexed based on double frequency combs and difference frequency.The present invention can significantly simplify transmitter architecture, reduce system cost of implementation, and can effectively ensure that the coherent pulse signalf between each road signal.
Description
Technical field
The present invention relates to the microwave photon MIMO that a kind of microwave photon radar detection method more particularly to a kind of difference frequency are multiplexed
(Multiple-Input Multiple-Output, multiple-input and multiple-output) radar detection method and microwave photon MIMO radar dress
It sets.
Background technique
Modern radar uses high diversity, including air traffic control, collision prevention of vehicle and meteorological precipitation detection etc., height
Precision, high-resolution and real-time multi-target detection be always radar developing direction, in order to realize real-time multi-target detection with
Track and high-resolution imaging need the aid for emitting signal, MIMO technology and High Speed Sampling System of big bandwidth (referring to [when Pan
Dragon, Zhu Dan, Zhang Fangzheng .Microwave Photonics for Modern Radar Systems [J] .Transactions
of Nanjing University of Aeronautics and Astronautics,2014,31(03):219-240.])。
Multiple-input and multiple-output (Multiple input multiple output, MIMO) radar is wireless communication system
In multiple inputs and multiple export techniques be introduced into field of radar, and the one kind for combining and generating with digital array technology is new
Radar.Microwave photon technology is applied to MIMO radar by Pan Shilong seminar, be utilized the big bandwidth of optical device, low-loss and
The characteristics such as electromagnetism interference provide the radar signal of big bandwidth for MIMO radar, improve the resolution ratio of radar.Except this it
Outside, MIMO radar has virtual aperture extended capability and more flexible power distribution ability, improves capacity usage ratio, the angle measurement of system
The performances such as precision, clutter recognition and low interception capability, in order to separate signal path, need to transmit it is mutually orthogonal between signal, one
As method have frequency division multiplexing, time division multiplexing and a wavelength-division multiplex, these types of mode band efficiency is not high and Digital Signal Processing
The sample rate of system is more demanding, and using difference frequency multiplexing method, radar can emit multiple signals simultaneously, complete in reception device
Receive signal in pairs to go tiltedly to handle, separate the reception signals of different channels, when signal it is mutually orthogonal in receiving end.
In order to improve the band efficiency of microwave photon MIMO radar, Pan Shilong seminar is in a Chinese invention patent
" a kind of MIMO radar detection method and device based on the orthogonal difference frequency multiplexing of microwave photon " is proposed in CN107222263A.It should
The thinking of technology is to utilize M modulator to the identical linear FM signal in the road M and the road M frequency at difference at radar emission end
The incremental local oscillation signal of frequency is mixed, and the mutually orthogonal up-conversion linear FM signal in the road M is obtained after photoelectric conversion and is sent
It goes out；Oblique and numeric field Frequency mixing processing is carried out to echo-signal using M reference optical signal in radar receiving end, at signal
Target acquisition information is obtained after reason.A structure in this way, can be improved the band efficiency of mimo system, obtain far more than
Practical number of sensors received and sent purpose data channel and degree of freedom in system can realize height under equal conditions in shorter time of measuring
Azimuth Resolution, and reduce the requirement to sampling rate.However, this method needs to generate the sheet of the road M different frequency
Shake signal, and need to use M modulator, and structure is complicated and at high cost, while the system coherent pulse signalf of not can guarantee makes subsequent letter
Number processing is limited.
Summary of the invention
Technical problem to be solved by the present invention lies in overcome the existing MIMO thunder based on the orthogonal difference frequency multiplexing of microwave photon
Up to the deficiency of Detection Techniques, a kind of MIMO radar detection method being multiplexed based on double frequency combs and difference frequency is provided, can be significantly simplified
Transmitter architecture reduces system cost of implementation, and can effectively ensure that the coherent pulse signalf between each road signal.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
The road M modulation light letter is firstly generated in transmitting terminal based on the MIMO radar detection method that double frequency combs and difference frequency are multiplexed
Number, and by wherein the beam splitting modulated optical signal of modulated optical signal is divided into the road N reference optical signal all the way, then the road M modulation light is believed
The mutually orthogonal linear FM signal in the road M is obtained after carrying out photoelectric conversion number respectively, it is emitted respectively by M transmitting antenna
It goes out；In receiving end, signal is reflected using the road M that N number of receiving antenna receives target respectively, and believe based on the road N reference light
Number, area of light is carried out to the received reflection signal of N number of receiving antenna institute respectively and goes tiltedly to handle, then passes through numeric field Frequency mixing processing
Afterwards, the digital signal that the road M × N carries target information is obtained, this digital signal is handled, target acquisition result is obtained；Institute
Stating M, N is positive integer, and sum of the two is more than or equal to 4；The road M modulated optical signal generates by the following method: first will
Light carrier is divided into upper and lower two-way；It is f with frequencyLOLocal oscillation signal processing is modulated to upper road light carrier, generate the first optical frequency
Signal is combed, is f with frequencydIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is modulated lower road light carrier
Processing generates the second frequency comb signal；After first frequency comb signal and the second frequency comb signal are coupled as all the way, pass through wave beam
Shaping filter is divided into the road the M modulation light being made of respectively single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line
Signal, this road M modulated optical signal carry out the signal difference frequency after beat frequency by f respectivelyd-fLOIt is incremented by successively.
One of preferably, described with frequency is fLOLocal oscillation signal processing is modulated to upper road light carrier, have
Body is to carry out phase-modulation to upper road light carrier using the local oscillation signal, generates the first frequency comb signal；It is described to be with frequency
fdIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is modulated processing to lower road light carrier, specifically: first
Phase-modulation is carried out to lower road light carrier with the intermediate-freuqncy signal, generates phase modulated signal；Then inhibiting to carry by work
The intermediate frequency (IF) Linear FM signal is modulated to the phase tune by the double parallel Mach-Zehnder modulators under wave single-side belt mode
On signal processed, the second frequency comb signal is generated.
Preferably two, described with frequency is fLOLocal oscillation signal processing is modulated to upper road light carrier, have
Body are as follows: it first passes through the double Mach-Zehnder modulators modulators of point multiplexing partially and the local oscillation signal is modulated on upper road light carrier, it is then right
Modulated signal generated carries out analyzing, generates the first frequency comb signal；Described with frequency is fdIntermediate-freuqncy signal and frequency be f0
The intermediate frequency (IF) Linear FM signal of+kt is modulated processing to lower road light carrier, specifically: it first passes through and divided multiplexing span hertz-partially once
The intermediate-freuqncy signal is modulated on lower road light carrier by Dare modulator, then carries out analyzing to modulated signal generated, most
The intermediate frequency (IF) Linear frequency modulation is believed by the double parallel Mach-Zehnder modulators under carrier-suppressed SSB mode that work afterwards
In modulated signal after number being modulated to analyzing, the second frequency comb signal is generated.
Preferably three, described with frequency is fLOLocal oscillation signal processing is modulated to upper road light carrier, have
Body are as follows: the local oscillation signal is divided into two-way；First pass through light polarization modulator local oscillation signal will be modulated on the light carrier of road all the way,
One main shaft of the light polarization modulator and upper road light carrier angle at 45 °；Then polarization modulation signals generated are examined
Partially；It finally will pass through phase modulator modulation after another way local oscillation signal phase shift on the polarization modulation signals after analyzing, generate
First frequency comb signal；Described with frequency is fdIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is to lower road light
Carrier wave is modulated processing, specifically: the intermediate-freuqncy signal is divided into two-way；First passing through light polarization modulator will intermediate-freuqncy signal all the way
It is modulated on lower road light carrier, a main shaft of the light polarization modulator and lower road light carrier angle at 45 °；Then to generated
Polarization modulation signals carry out analyzing；Then it is inclined after analyzing will to pass through phase modulator modulation after another way intermediate-freuqncy signal phase shift
In modulated signal of shaking；Finally by double parallel Mach-Zehnder modulators of the work under carrier-suppressed SSB mode by institute
It states intermediate frequency (IF) Linear FM signal to be modulated on phase modulated signal generated, generates the second frequency comb signal.
It is somebody's turn to do it is further preferred that the initial frequency of the intermediate frequency (IF) Linear FM signal component in any road modulated optical signal is greater than
Local oscillation signal component frequencies in modulated optical signal；RMAXFor radar maximum detectable range, c
For the light velocity, k is the chirp rate of the intermediate frequency (IF) Linear FM signal.
Following technical scheme can also be obtained according to identical invention thinking:
Based on the MIMO radar detection device that double frequency combs and difference frequency are multiplexed, including transmitting terminal and receiving end；
The transmitting terminal includes:
The road M optical signal generation module, for generating the road M modulated optical signal；
It is mutually orthogonal to obtain the road M for carrying out photoelectric conversion respectively to the road M modulated optical signal for M photodetector
Linear FM signal；
M transmitting antenna, for launching the mutually orthogonal linear FM signal in the road M respectively；
With reference to optical module, for by wherein the beam splitting modulated optical signal of modulated optical signal is divided into the road N reference optical signal all the way；
The receiving end includes:
Signal is reflected on N number of receiving antenna, the road M for receiving target；
N number of area of light removes inclined module, for being based on the road N reference optical signal, believes the received reflection of N number of receiving antenna institute
Area of light is carried out number respectively to go tiltedly to handle, and numeric field Frequency mixing processing is carried out to acquired signal, is obtained the road M × N and is carried target letter
The digital signal of breath；
Signal acquisition and processing unit obtain target acquisition result for handling the digital signal；
Described M, N are positive integer, and sum of the two is more than or equal to 4；
The road the M optical signal generation module includes:
Light carrier unit, for light carrier to be divided into upper and lower two-way；
First frequency comb unit, for being f with frequencyLOLocal oscillation signal processing is modulated to upper road light carrier, generate
First frequency comb signal；
Second frequency comb unit, for being f with frequencydIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt
Processing is modulated to lower road light carrier, generates the second frequency comb signal；
Beam-shaping filter unit, the signal point for the first frequency comb signal and the second frequency comb signal to be coupled to form
At the road the M modulated optical signal being made of respectively single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line, the modulation of this road M
Optical signal carries out the signal difference frequency after beat frequency by f respectivelyd-fLOIt is incremented by successively.
One of preferably, the first frequency comb unit includes phase-modulator, for being believed using the local oscillator
Number to upper road light carrier carry out phase-modulation, generate the first frequency comb signal；The second frequency comb unit includes cascade phase
Position modulator, double parallel Mach-Zehnder modulators, phase-modulator is for carrying out lower road light carrier with the intermediate-freuqncy signal
Phase-modulation generates phase modulated signal；The double parallel Mach-Zehnder modulators work is in carrier-suppressed SSB mode
Under, for the intermediate frequency (IF) Linear FM signal to be modulated to the phase modulated signal, generate the second frequency comb signal.
Preferably two, the first frequency comb unit include point be multiplexed partially double Mach-Zehnder modulators modulators and
Analyzer, the partially double Mach-Zehnder modulators modulators of point multiplexing are used to the local oscillation signal being modulated to upper road light carrier, analyzer
For carrying out analyzing to modulated signal generated, the first frequency comb signal is generated；The second frequency comb unit includes successively
The double Mach-Zehnder modulators modulators of cascade point multiplexing partially, analyzer, double parallel Mach-Zehnder modulators, partially point multiplexing span
Conspicuous-Zeng Deer modulator is used to for the intermediate-freuqncy signal being modulated to lower road light carrier, and analyzer is used for modulation generated
Signal carries out analyzing, and under carrier-suppressed SSB mode, being used for will be described for the double parallel Mach-Zehnder modulators work
Intermediate frequency (IF) Linear FM signal is modulated in the modulated signal after analyzing, generates the second frequency comb signal.
Preferably three, the first frequency comb unit includes light polarization modulator, analyzer, phase shifter, phase
Modulator, a main shaft of the light polarization modulator and upper road light carrier angle at 45 °, for that will modulate the local oscillation signal all the way
On Yu Shanglu light carrier, analyzer is used to carry out polarization modulation signals generated analyzing, and phase shifter is used for another way institute
It states local oscillation signal and carries out phase shift, the another way local oscillation signal after phase shift for being modulated to the polarization tune after analyzing by phase-modulator
On signal processed, the first frequency comb signal is generated；The second frequency comb unit includes light polarization modulator, analyzer, phase shifter, phase
Position modulator, double parallel Mach-Zehnder modulators, a main shaft of the light polarization modulator and lower road light carrier angle at 45 °,
For that the intermediate-freuqncy signal will be modulated to lower road light carrier all the way, analyzer is used to carry out polarization modulation signals generated
Analyzing, phase shifter carry out phase shift for the intermediate-freuqncy signal described in another way, and phase-modulator is used for will be in the another way after phase shift
Frequency signal modulation is on the polarization modulation signals after analyzing, and the double parallel Mach-Zehnder modulators work is in suppressed carrier
Under single-side belt mode, for the intermediate frequency (IF) Linear FM signal to be modulated to the phase modulated signal of phase-modulator output,
Generate the second frequency comb signal.
It is somebody's turn to do it is further preferred that the initial frequency of the intermediate frequency (IF) Linear FM signal component in any road modulated optical signal is greater than
Local oscillation signal component frequencies in modulated optical signal；RMAXFor radar maximum detectable range, c
For the light velocity, k is the chirp rate of the intermediate frequency (IF) Linear FM signal.
Compared with prior art, technical solution of the present invention has the advantages that
1) present invention generates scheme using the signal based on double frequency combs and goes rectangle case to realize based on difference frequency multiplexing
MIMO radar detection, wherein double frequency combs generate difference frequency signal scheme compared with prior art, greatly simplify transmitter knot
Structure reduces system cost, and ensure that the coherent pulse signalf between each road signal, and difference frequency multiplexing technology substantially increases radar system
Band efficiency and azimuth resolution, reduce the requirement to sampling rate.
2) present invention uses MIMO radar multiple-input and multiple-output structure, can emit reception multiple signals simultaneously, increase
The diversity and dimension of information are obtained, while the road Zai Mei receives all comprising the transmitting signal of multiple channels in signal, it can be polygonal
The observed object of degree improves the azimuth resolution of radar.
3) present invention is in signal process part, can be to going tiltedly merely with the analog-to-digital conversion module of low speed after
Electric signal carries out sampling processing, is not necessarily to specific digital matched filtering, increases the sampling rate and quality of signal, reduce number
According to the requirement of storage, real-time signal processing can be realized.
Detailed description of the invention
Fig. 1 is the basic structure schematic diagram for the MIMO radar detection device being multiplexed the present invention is based on double frequency combs and difference frequency；
Fig. 2 is the optical signal schematic diagram that the road M optical signal generation module generates；
Fig. 3 is a kind of concrete structure schematic diagram of the road M optical signal generation module；
Fig. 4 is another concrete structure schematic diagram of the road M optical signal generation module；
Fig. 5 is another concrete structure schematic diagram of the road M optical signal generation module.
Specific embodiment
For the deficiency of the existing MIMO radar Detection Techniques based on the orthogonal difference frequency multiplexing of microwave photon, solution of the invention
Thinking is improved to transmitting terminal, generates difference frequency signal using double frequency comb schemes, realize band efficiency promotion,
The azimuth resolution of radar is improved, while reducing the requirement to sampling rate, transmitter architecture can be significantly simplified, reduce system
System cost of implementation, and can effectively ensure that the coherent pulse signalf between each road signal.
The MIMO radar detection method proposed by the invention being multiplexed based on double frequency combs and difference frequency, specific as follows:
In transmitting terminal, the road M modulated optical signal is firstly generated, and by the wherein beam splitting modulated optical signal of modulated optical signal all the way
It is divided into the road N reference optical signal, then carries out obtaining after photoelectric conversion mutually orthogonal linear in the road M respectively to the road M modulated optical signal
FM signal launches it by M transmitting antenna respectively；In receiving end, target is received respectively using N number of receiving antenna
The road M reflect signal, and be based on the road N reference optical signal, light carried out respectively to the received reflection signal of N number of receiving antenna institute
Domain is gone tiltedly to handle, and then after numeric field Frequency mixing processing, the digital signal that the road M × N carries target information is obtained, to this number
Signal is handled, and target acquisition result is obtained；Described M, N are positive integer, and sum of the two is more than or equal to 4；The road M tune
Optical signal processed generates by the following method: light carrier being divided into upper and lower two-way first；It is f with frequencyLOLocal oscillation signal to upper road
Light carrier is modulated processing, generates the first frequency comb signal, is f with frequencydIntermediate-freuqncy signal and frequency be f0The intermediate frequency of+kt
Linear FM signal is modulated processing to lower road light carrier, generates the second frequency comb signal；By the first frequency comb signal and
After two frequency comb signals are coupled as all the way, by beam-shaping filtering be divided into respectively by single intermediate frequency (IF) Linear frequency modulation spectral line and
The road the M modulated optical signal that single local oscillation signal spectral line is constituted, this road M modulated optical signal carry out the signal difference frequency after beat frequency respectively
By fd-fLOIt is incremented by successively.
For convenient for public understanding, technical solution of the present invention is described in detail with reference to the accompanying drawing:
As shown in Figure 1, in transmitting terminal, the light carrier that light source generates passes through the basic structure of MIMO radar detection device of the present invention
Cross the road M optical signal generation module, generate the road M modulated optical signal, will wherein modulated optical signal is divided into two-way all the way, will wherein all the way
It is separated into the road N reference optical signal and is sent into receiving end；Photoelectricity is carried out respectively to this road M modulated optical signal using M photodetector
Conversion, obtains the mutually orthogonal linear FM signal in the road M, the mutually orthogonal linear FM signal in this road M is used amplifier respectively
(PA) it after amplifying, is reflected away finally by M transmitting antenna (Tr).In receiving end, utilize N number of receiving antenna (Re) point
Not Jie Shou the road M of target reflect signal, and the road N reference optical signal is based on, to the received reflection signal of N number of receiving antenna institute
Area of light is carried out respectively to go tiltedly to handle, and then after numeric field Frequency mixing processing, obtains the number letter that the road M × N carries target information
Number, this digital signal is handled, target acquisition result is obtained；Described M, N are positive integer, and sum of the two is more than or equal to
4。
The basic realization structure and principle of receiving end with it is essentially identical in CN107222263A, for the sake of saving space, this
Place repeats no more.Unlike the prior art, the road M optical signal generation module of the invention uses double frequency comb schemes, such as
Shown in Fig. 1, light carrier is divided into upper and lower two-way with light carrier units first；First frequency comb unit is f with frequencyLOLocal oscillator
Signal is modulated processing to upper road light carrier, generates the first frequency comb signal, the second frequency comb unit is f with frequencydIn
Frequency signal and frequency are f0The intermediate frequency (IF) Linear FM signal of+kt is modulated processing to lower road light carrier, generates the second frequency comb
Signal；Beam-shaping filter unit is by the first frequency comb signal (local oscillator frequency comb, OFC1) and the second frequency comb signal (linear tune
Frequency signal frequency comb, OFC2) signal that is coupled to form is divided into the road M modulated optical signal.Frequency domain representation such as Fig. 2 of this road M optical signal
Shown, the double frequency combs for having m+n group comb teeth that the road M optical signals generate obtain at equal intervals, and wherein m and n is positive integer, local oscillator
Frequency comb initial frequency is fLO, cutoff frequency is (m+n) fLO, f is divided between adjacent fingersLO, the starting of linear FM signal frequency comb
Frequency is fd+f0+ kt, cutoff frequency are (m+n) fd+f0+ kt is divided into f between adjacent fingersd, and f need to be metd>fLO, the modulation of the i-th tunnel
Optical signal is respectively if by single frequencyd+f0+ kt intermediate frequency (IF) Linear frequency modulation spectral line and single frequency are ifLOLocal oscillation signal spectral line structure
At (1≤i≤m+n), beat frequency is i (fd-fLO)+f0+ kt, i+1 road intermediate frequency (IF) Linear frequency modulation spectral line and local oscillation signal spectral line are clapped
The big f in the i-th tunnel of frequency ratiod-fLO, that is, optical signal adjacent two-way beat frequency difference frequency in the road M is by fd-fLOIt is incremented by.
A variety of different structures can be used to realize for the above-mentioned road M optical signal generation module, for ease of understanding, have below with three
Body example is described in detail.
Fig. 3 shows the basic structure of the road M first specific embodiment of optical signal generation module.The module includes: one
Laser, two phase-modulators (PM), a double parallel Mach-Zehnder modulators (DPMZM), three phase controllers
(PC), two photo-couplers (OC), a programmable optical processor (Waveshaper).As shown in figure 3, laser generates frequency
fsigDirect current light respectively enterd by coupler and be modulated on two phase-modulators (PM), be f with frequencyLOLocal oscillator letter
Number LO drives a PM, and the frequency comb of generation can indicate are as follows:
It is f with frequencydIntermediate-freuqncy signal Fd drive a PM, by PM export optical signal be passed through DPMZM, use intermediate frequency (IF) Linear
FM signal LFM drives DPMZM, the DPMZM to work in carrier-suppressed SSB mode, and the frequency comb of generation can indicate are as follows:
Wherein AmIt is that each frequency point corresponds to amplitude, fsigIt is the frequency of light carrier, fdFor IF signal frequency, f0For intermediate frequency (IF) Linear
The initial frequency of FM signal, k are its chirp rate.
The two ways of optical signals that the two PM are exported synthesizes optical signal all the way by photo-coupler and passes through at programmable optical
It manages device and carries out beam-shaping filtering, obtain M and route the light that single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line are constituted
Signal, the difference frequency between these intermediate frequency (IF) Linear FM signals and local oscillation signal are incremented by fd-fLO；These optical signals are inputted respectively
Photodetector is launched to get the linear frequency modulation electric signal mutually orthogonal to the road M by M antenna, wherein the road m is sent out
Penetrating signal can indicate are as follows:
fTm(t)∝AmBm exp{j2π[m(fd-fLO)+fLO+f0+kt]t}。
Fig. 4 shows the basic structure of the road M second specific embodiment of optical signal generation module.As shown in figure 4, the module
It include: a laser, two inclined point of multiplexing double Mach-Zehnder modulators modulators (PM-DMZM), a double parallel Mach-Zehnder
That modulator (DPMZM), two analyzers (Pol), a programmable optical processor (Waveshaper).Laser generates frequency
For fsigDirect current light two-way be divided by coupler respectively enter two and point be multiplexed double Mach-Zehnder modulators modulator (PM- partially
DMZM it is modulated on)；It is f with frequencyLOLocal oscillation signal drive the PM-DMZM on upper road, the optical signal of output enters analyzer
(Pol) analyzing is carried out, the frequency comb of generation can indicate are as follows:
Wherein AmIt is that each frequency point corresponds to amplitude, fsigIt is the frequency of light carrier.
In addition all the way, frequency is being generated as f by phaselocked loopdIntermediate-freuqncy signal, generated with Direct Digital Frequency Synthesizers
One intermediate frequency (IF) Linear FM signal；The PM-DMZM on lower road is driven with the intermediate-freuqncy signal, the optical signal of output enters analyzer
(Pol) analyzing is carried out, the Pol optical signal exported is passed through to the DPMZM on lower road, it should with intermediate frequency (IF) Linear FM signal driving
DPMZM, the DPMZM work in carrier-suppressed SSB mode, and the frequency comb of generation can indicate are as follows:
Wherein BmIt is that each frequency point corresponds to amplitude, fsigIt is the frequency of light carrier, fdFor IF signal frequency, f0For intermediate frequency (IF) Linear
The initial frequency of FM signal, k are its chirp rate.
The optical signal of this two-way PM-DMZM output is synthesized into optical signal all the way by photo-coupler and is passed through at programmable optical
It manages device and carries out beam-shaping filtering, obtain M and route the light that single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line are constituted
Signal, the difference frequency between these intermediate frequency (IF) Linear FM signals and local oscillation signal are incremented by fd-fLO；These optical signals are inputted into photoelectricity
Detector, output obtain the mutually orthogonal linear frequency modulation electric signal in the road M, are launched by M antenna, wherein the road m emits
Signal can indicate are as follows:
fTm(t)∝AmBm exp{j2π[m(fd-fLO)+fLO+f0+kt]t}。
Fig. 5 shows the basic structure of the road M optical signal generation module third specific embodiment.As shown in figure 5, the module
It include: a laser, two light polarization modulators (PolM), two phase-modulators (PM), a double parallel Mach-Zehnder
Modulator (DPMZM), two phase shifters (PS), two analyzers (Pol), six phase controllers (PC), two photo-couplers
(OC), a programmable optical processor (Waveshaper).
It is f that laser, which generates frequency,sigDirect current light two-way be divided by coupler respectively enter two light polarization modulators
(PolM) it is modulated on, by adjusting Polarization Controller 1 and adjustment Polarization Controller 4 (PC1 and PC4), so that from laser
(LD) a main shaft angle at 45 ° of the linear polarization feeding sputtering light wave and PolM that set out.
In upper branch, generating frequency by phaselocked loop is fLOLocal oscillation signal, the local oscillation signal is divided into two-way.With one
Road local oscillation signal drives a PolM.Due to a main shaft angle at 45 ° of incident light wave and PolM, so along two masters of PolM
Axis can generate a pair of of complementary phase control signal.PolM output signal is inputted into PC2, is obtained by adjusting PC2 containing there are two orthogonal inclined
The optical signal of polarization state.Output optical signal input analyzer (Pol) is subjected to analyzing, and passes through PC3 input phase modulator (PM).
Another way local oscillation signal is modulated the PolM output optical signal after analyzing by phase shifter (PS) driving PM, the optical frequency of generation
Comb can indicate are as follows:
Wherein AmIt is that each frequency point corresponds to amplitude, fsigIt is the frequency of light carrier, fdFor IF signal frequency, f0For starting frequency
Rate, k are its chirp rate.
In addition generating frequency by phaselocked loop all the way is fdIntermediate-freuqncy signal, Direct Digital Frequency Synthesizers generate one in
The intermediate-freuqncy signal is divided into two-way by frequency linear FM signal.A PolM is driven with intermediate-freuqncy signal all the way, and by the tune of generation
Optical signal processed inputs PM through Pol and PC.Another way intermediate-freuqncy signal by PS driving PM to the PolM output optical signal after analyzing into
Row modulation.The PM optical signal exported is passed through a DPMZM, drives DPMZM, DPMZM work with the intermediate frequency (IF) Linear FM signal
Make in carrier-suppressed SSB mode, the frequency comb of generation can indicate are as follows:
Wherein AmIt is that each frequency point corresponds to amplitude, fsigIt is the frequency of light carrier, fdFor IF signal frequency, f0For starting frequency
Rate, k are its chirp rate.
This two-way frequency comb signal is synthesized into optical signal all the way by photo-coupler and passes through programmable optical processor, is passed through
Beam-shaping filtering is divided into M and routes the modulated optical signal that single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line are constituted,
Difference frequency between these intermediate frequency (IF) Linear FM signals and local oscillation signal is incremented by fd-fLO；These optical signals are inputted into photodetection
Device, output obtain the mutually orthogonal linear frequency modulation electric signal in the road M, are launched by M antenna, wherein the road m emits signal
It can indicate are as follows:
fTm(t)∝AmBm exp{j2π[m(fd-fLO)+fLO+f0+kt]t}
It may be noted that the intermediate frequency (IF) Linear FM signal point in order to further avoid frequency overlapping, in any road modulated optical signal
The initial frequency of amount should be greater than the local oscillation signal component frequencies in modulated optical signal:
ifd+f0>ifLO (1≤i≤M)
In order to avoid the echo-signal of the road m transmitting signal is Chong Die with the road the m+1 transmitting frequency of signal, need to meet:
Wherein, fd-fLOEmit the difference on the frequency between signal, R for each roadMAXFor radar maximum detectable range, c is the light velocity.
Claims (10)
1., in transmitting terminal, firstly generating the road M modulation light letter based on the MIMO radar detection method that double frequency combs and difference frequency are multiplexed
Number, and by wherein the beam splitting modulated optical signal of modulated optical signal is divided into the road N reference optical signal all the way, then the road M modulation light is believed
The mutually orthogonal linear FM signal in the road M is obtained after carrying out photoelectric conversion number respectively, it is emitted respectively by M transmitting antenna
It goes out；In receiving end, signal is reflected using the road M that N number of receiving antenna receives target respectively, and believe based on the road N reference light
Number, area of light is carried out to the received reflection signal of N number of receiving antenna institute respectively and goes tiltedly to handle, then passes through numeric field Frequency mixing processing
Afterwards, the digital signal that the road M × N carries target information is obtained, this digital signal is handled, target acquisition result is obtained；Institute
Stating M, N is positive integer, and sum of the two is more than or equal to 4；It is characterized in that, the road M modulated optical signal is by the following method
It generates: light carrier being divided into upper and lower two-way first；It is f with frequencyLOLocal oscillation signal processing is modulated to upper road light carrier,
The first frequency comb signal is generated, is f with frequencydIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is to lower road light
Carrier wave is modulated processing, generates the second frequency comb signal；First frequency comb signal and the second frequency comb signal are coupled as one
Lu Hou is divided into respectively by beam-shaping filtering by single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line institute structure
At the road M modulated optical signal, this road M modulated optical signal carries out the signal difference frequency after beat frequency by f respectivelyd-fLOIt is incremented by successively.
2. MIMO radar detection method as described in claim 1, which is characterized in that described with frequency is fLOLocal oscillation signal to upper
Road light carrier is modulated processing, specially carries out phase-modulation to upper road light carrier using the local oscillation signal, generates first
Frequency comb signal；Described with frequency is fdIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is to lower road light carrier
It is modulated processing, specifically: phase-modulation first is carried out to lower road light carrier with the intermediate-freuqncy signal, generates phase-modulation letter
Number；Then by the double parallel Mach-Zehnder modulators under carrier-suppressed SSB mode of working by the intermediate frequency (IF) Linear
FM signal is modulated on the phase modulated signal, generates the second frequency comb signal.
3. MIMO radar detection method as described in claim 1, which is characterized in that described with frequency is fLOLocal oscillation signal to upper
Road light carrier is modulated processing, specifically: it first passes through and divides the double Mach-Zehnder modulators modulators of multiplexing by the local oscillation signal tune partially
It is formed on the light carrier of road, analyzing then is carried out to modulated signal generated, generate the first frequency comb signal；It is described to use frequency
For fdIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is modulated processing to lower road light carrier, specifically:
It first passes through and point is multiplexed a double Mach-Zehnder modulators modulators partially the intermediate-freuqncy signal is modulated on lower road light carrier, then to giving birth to
At modulated signal carry out analyzing, finally by double parallel Mach-Zehnder tune of the work under carrier-suppressed SSB mode
The intermediate frequency (IF) Linear FM signal is modulated in the modulated signal after analyzing by device processed, generates the second frequency comb signal.
4. MIMO radar detection method as described in claim 1, which is characterized in that described with frequency is fLOLocal oscillation signal to upper
Road light carrier is modulated processing, specifically: the local oscillation signal is divided into two-way；First passing through light polarization modulator will local oscillator all the way
On signal modulation Yu Shanglu light carrier, a main shaft of the light polarization modulator and upper road light carrier angle at 45 °；Then to giving birth to
At polarization modulation signals carry out analyzing；Finally it will pass through phase modulator modulation after another way local oscillation signal phase shift after analyzing
Polarization modulation signals on, generate the first frequency comb signal；Described with frequency is fdIntermediate-freuqncy signal and frequency be f0In+kt
Frequency linear FM signal is modulated processing to lower road light carrier, specifically: the intermediate-freuqncy signal is divided into two-way；It first passes through partially
Vibration modulator intermediate-freuqncy signal will be modulated on lower road light carrier all the way, the main shaft and lower road light carrier of the light polarization modulator
Angle at 45 °；Then analyzing is carried out to polarization modulation signals generated；Then it will pass through phase after another way intermediate-freuqncy signal phase shift
Modulators modulate is on the polarization modulation signals after analyzing；Finally by double parallel of the work under carrier-suppressed SSB mode
The intermediate frequency (IF) Linear FM signal is modulated on phase modulated signal generated by Mach-Zehnder modulators, generates second
Frequency comb signal.
5. MIMO radar detection method as described in claim 1, which is characterized in that the intermediate frequency (IF) Linear in any road modulated optical signal
The initial frequency of FM signal component is greater than the local oscillation signal component frequencies in the modulated optical signal；RMAXFor radar maximum detectable range, c is the light velocity, and k is the intermediate frequency (IF) Linear FM signal
Chirp rate.
6. based on the MIMO radar detection device that double frequency combs and difference frequency are multiplexed, including transmitting terminal and receiving end；
The transmitting terminal includes:
The road M optical signal generation module, for generating the road M modulated optical signal；
M photodetector obtains the mutually orthogonal line in the road M for carrying out photoelectric conversion respectively to the road M modulated optical signal
Property FM signal
M transmitting antenna, for launching the mutually orthogonal linear FM signal in the road M respectively；
With reference to optical module, for by wherein the beam splitting modulated optical signal of modulated optical signal is divided into the road N reference optical signal all the way；
The receiving end includes:
Signal is reflected on N number of receiving antenna, the road M for receiving target；
N number of area of light removes inclined module, for being based on the road N reference optical signal, to the received reflection signal point of N number of receiving antenna institute
Not carry out area of light go tiltedly to handle, and numeric field Frequency mixing processing is carried out to acquired signal, obtains the road M × N and carry target information
Digital signal；
Signal acquisition and processing unit obtain target acquisition result for handling the digital signal；
Described M, N are positive integer, and sum of the two is more than or equal to 4；
It is characterized in that, the road the M optical signal generation module includes:
Light carrier unit, for light carrier to be divided into upper and lower two-way；
First frequency comb unit, for being f with frequencyLOLocal oscillation signal processing is modulated to upper road light carrier, generate first
Frequency comb signal；
Second frequency comb unit, for being f with frequencydIntermediate-freuqncy signal and frequency be f0The intermediate frequency (IF) Linear FM signal of+kt is under
Road light carrier is modulated processing, generates the second frequency comb signal；
Beam-shaping filter unit, the signal for the first frequency comb signal and the second frequency comb signal to be coupled to form are divided into point
The road the M modulated optical signal not being made of single intermediate frequency (IF) Linear frequency modulation spectral line and single local oscillation signal spectral line, this road M modulation light letter
Signal difference frequency after carrying out beat frequency number respectively presses fd-fLOIt is incremented by successively.
7. MIMO radar detection device as claimed in claim 6, which is characterized in that the first frequency comb unit includes phase tune
Device processed generates the first frequency comb signal for carrying out phase-modulation to upper road light carrier using the local oscillation signal；Described second
Frequency comb unit includes cascade phase-modulator, double parallel Mach-Zehnder modulators, and phase-modulator is used for in described
Frequency signal carries out phase-modulation to lower road light carrier, generates phase modulated signal；The double parallel Mach-Zehnder modulators work
Make under carrier-suppressed SSB mode, for the intermediate frequency (IF) Linear FM signal to be modulated to the phase modulated signal,
Generate the second frequency comb signal.
8. MIMO radar detection device as claimed in claim 6, which is characterized in that the first frequency comb unit includes dividing partially again
With double Mach-Zehnder modulators modulators and analyzer, the double Mach-Zehnder modulators modulators of point multiplexing partially are used for the local oscillation signal tune
It is formed on the light carrier of road, analyzer is used to carry out analyzing to modulated signal generated, generates the first frequency comb signal；It is described
Second frequency comb unit includes successively being multiplexed double Mach-Zehnder modulators modulators, analyzer, double parallel Mach-once for cascade inclined point
Dare modulator, the partially double Mach-Zehnder modulators modulators of point multiplexing are used to the intermediate-freuqncy signal being modulated to lower road light carrier, examine
Inclined device is used to carry out modulated signal generated analyzing, and the double parallel Mach-Zehnder modulators work is in suppressed carrier
Under single-side belt mode, for the intermediate frequency (IF) Linear FM signal to be modulated to the modulated signal after analyzing, the second optical frequency is generated
Comb signal.
9. MIMO radar detection device as claimed in claim 6, which is characterized in that the first frequency comb unit includes that polarization is adjusted
Device processed, analyzer, phase shifter, phase-modulator, a main shaft of the light polarization modulator and upper road light carrier angle at 45 ° are used
In the local oscillation signal being modulated on upper road light carrier all the way, analyzer is for examining polarization modulation signals generated
Partially, phase shifter carries out phase shift for the local oscillation signal described in another way, and phase-modulator is used for the another way local oscillator after phase shift
Signal modulation generates the first frequency comb signal on the polarization modulation signals after analyzing；The second frequency comb unit includes inclined
Shake modulator, analyzer, phase shifter, phase-modulator, double parallel Mach-Zehnder modulators, and the one of the light polarization modulator
A main shaft and lower road light carrier angle at 45 °, for that the intermediate-freuqncy signal will be modulated to lower road light carrier all the way, analyzer is used for
Analyzing is carried out to polarization modulation signals generated, phase shifter carries out phase shift, phase tune for the intermediate-freuqncy signal described in another way
Device processed is used to the another way intermediate-freuqncy signal after phase shift being modulated to the polarization modulation signals after analyzing, the double parallel Mach-
Zeng Deer modulator works under carrier-suppressed SSB mode, for the intermediate frequency (IF) Linear FM signal to be modulated to phase tune
On the phase modulated signal of device output processed, the second frequency comb signal is generated.
10. MIMO radar detection device as claimed in claim 6, which is characterized in that the intermediate frequency line in any road modulated optical signal
Property FM signal component initial frequency be greater than the modulated optical signal in local oscillation signal component frequencies；RMAXFor radar maximum detectable range, c is the light velocity, and k is the intermediate frequency (IF) Linear FM signal
Chirp rate.
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