CN106093931A - Radar-Communication Integrated receiving/transmission method based on digital array antenna - Google Patents
Radar-Communication Integrated receiving/transmission method based on digital array antenna Download PDFInfo
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- CN106093931A CN106093931A CN201610374339.7A CN201610374339A CN106093931A CN 106093931 A CN106093931 A CN 106093931A CN 201610374339 A CN201610374339 A CN 201610374339A CN 106093931 A CN106093931 A CN 106093931A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/2813—Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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- Radio Transmission System (AREA)
Abstract
The invention belongs to Radar Technology field, disclose Radar-Communication Integrated receiving/transmission method based on digital array antenna, the performance requirement of communication and radar system can be met simultaneously, comprise determining that the launching beam weight vector of digital array antenna；Determine the transmitting signal waveform of Digital Array Radar；The ofdm signal of constant modulus value is added Cyclic Prefix；The ofdm signal of band Cyclic Prefix is multiplied with launching beam weight vector, completes signal and launch；Obtain the reception data of digital array antenna, determine radar weight coefficient and the right of correspondence coefficient of digital array antenna receiving terminal；Obtain Radar channel according to reception data and radar weight coefficient and receive signal, it is carried out matched filtering, obtains the range information of radar target；Obtain communication channel according to reception data and right of correspondence coefficient and receive signal, it is carried out successively signal equalization, coherent digital demodulation, thus obtains the data bit flow of communication base station transmission.
Description
Technical field
The present invention relates to Radar Technology field, particularly relate to a kind of Radar-Communication Integrated based on digital array antenna and receive
Forwarding method, the communicating integral signal for Digital Array Radar sends and receives, and Radar-Communication Integrated signal refers at thunder
Reaching the modulation communication information in signal waveform, both share a signal waveform, thus realize Radar-Communication Integrated.
Background technology
Along with Radar Technology and the development of digital technology, modern radar the most progressively digitized, digitized radar obtains
Increasing attention and research, Digital Array Radar is the main Types of digitized radar.It is different from traditional phased array thunder
Reaching, Digital Array Radar is the digital array scanning thunder that a kind of transmitting and reception wave beam all use digital beam forming technology
Reach, numeric field carries out width and weights launching or receiving signal mutually and form high-quality required wave beam, can effective gram
Take the inherent shortcoming of phased array radar.Traditional phased array radar has from the Radio frequency interference of inside and outside and ring
The factors such as border temperature and humidity are the most sensitive, and the analog device used is expensive, and power consumption is relatively big, and poor reliability etc. is intrinsic to be lacked
Fall into.
In Radar-Communication Integrated system, the Waveform Design of integration signal be one important and challenging
Problem.Orthogonal frequency division multiplex OFDM waveform has been applied successfully in the communication system of Broadband high-speed data transmission, in recent years,
OFDM waveform is also studied in Radar-Communication Integrated is applied.OFDM radar signal is by launching multiple carrier wave or logical simultaneously
Cross certain conversion and realize multi-carrier transmission, there is High Range Resolution, the most also there is low auto-correlation function secondary lobe, frequency spectrum profit
With the high good characteristic of rate.
Along with digital communication technology application in radar, Radar-Communication Integrated problem based on array antenna also obtains
Increasing concern and research.But traditional divided antenna array signal transceiver mode be successively send in time radar and
Signal of communication, resource of losing time very much；And although shared antenna hypermatrix column signal transceiver mode is to send communication and radar simultaneously
Signal, but owing to being that radar signal sent out by a part of antenna, a part sends out signal of communication so that the gain of the two is subtracted simultaneously
Weak.Therefore the difficult point of the signal transmit-receive method of Radar-Communication Integrated system is that the shared antenna of integration signal is received and dispatched simultaneously.
Summary of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide Radar-Communication based on digital array antenna
Integration receiving/transmission method, can meet the performance requirement of communication and radar so that signal shared antenna is received and dispatched simultaneously, it is thus achieved that higher simultaneously
Gain, the most time-consuming resource；Mainly solve signal based on traditional analog phased array in prior art launch and receive
The problems such as beam switchover is dumb, and dead-center position control is the most convenient, wave beam low sidelobe is relatively difficult to achieve.
Technical solution of the present invention uses for reference communication waveforms and signal of communication processes, it is proposed that communication based on digital array antenna
Radar integration receiving/transmission method, Digital Array Radar has the advantage that traditional analog phased-array radar is incomparable.Digital Arrays
Row radar obtains digital medium-frequency signal in array front end, carries out digital beam froming and process in rear end, with simulation phased array thunder
Reach to compare and can obtain the highest dynamic range, be conducive to detecting small-signal；And Digital Array Radar formed multi-beam than
Phased-array radar flexible convenient a lot, digital echo signal data can set the wave beam on different distance unit the most flexibly
Weights and pulse pressure weights, thus taken into account closely Sidelobe and remote low-loss；The wave beam of Digital Array Radar controls spirit
Living accurately, beam scanning precision is high, and scope is wide, and radar can instantaneous switching between different mode or working method.
For reaching above-mentioned purpose, embodiments of the invention adopt the following technical scheme that and are achieved.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna, the signal for Digital Array Radar is sent out
Sending and receive, Radar-Communication Integrated signal refers to modulate the communication information on radar signal waveform, and both share a signal
Waveform, described method comprises the steps:
Step 1, determines that the launching beam weight vector of digital array antenna, described launching beam weight vector make digital array
Radar forms main beam at detection target direction, and the gain on communication base station direction is less than the gain of described main beam；
Step 2, determines the transmitting signal waveform of communication base station, and described transmitting signal waveform is the time domain OFDM of constant modulus value
Signal；
Step 3, adds Cyclic Prefix to the ofdm signal of described constant modulus value, obtains the ofdm signal of band Cyclic Prefix；
Step 4, is multiplied the ofdm signal of described band Cyclic Prefix with described launching beam weight vector, completes digital array
The signal of radar is launched；
Step 5, obtains the reception data of described digital array antenna, determines that the radar power of digital array antenna receiving terminal is
Number and right of correspondence coefficient, described radar weight coefficient forms main beam, at communication base station at Digital Array Radar detection target direction
Direction forms zero point, and described right of correspondence coefficient forms zero point, in communication base station direction at Digital Array Radar detection target direction
Form main beam；
Step 6, obtains Radar channel according to described reception data and described radar weight coefficient and receives signal, clip described thunder
Reach the Cyclic Prefix of Channel Received Signal, the Radar channel without Cyclic Prefix is received signal and carries out matched filtering, thus obtain
Range information to radar target；
Step 7, obtains communication channel according to described reception data and described right of correspondence coefficient and receives signal, clips described logical
The Cyclic Prefix of letter Channel Received Signal, receives signal to the communication channel without Cyclic Prefix and carries out channel equalization, phase successively
Dry digital demodulation, thus obtain the data bit flow of communication base station transmission.
The present invention compared with prior art has the advantage that
First, due to the fact that employing digital array antenna technology, the performance requirement of communication and radar can be met simultaneously, and
And there is amplitude and Phase Continuation is the most adjustable, it is easy to accomplish the launching beam of low sidelobe, wave beam jump degree is low, beam switchover is fast
The advantages such as prompt flexible and dead-center position is the most controlled.Owing to being designed the weight vector of digital array antenna by optimization, have more
High robustness, range of application is more extensive.
Second, due to the fact that the method for the dead-center position utilizing control signal to receive beam shaping respectively obtains radar letter
Number and signal of communication, follow-up Radar Signal Processing and signal of communication therefore can be made to process and to be independent of each other mutually, and more flexible
Controlled, can be used for the design of Radar-Communication Integrated system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
A kind of based on digital array antenna the Radar-Communication Integrated receiving/transmission method that Fig. 1 provides for the embodiment of the present invention
Schematic flow sheet；
Fig. 2 is the beam pattern that signal launched by the digital array antenna that the inventive method produces；
Fig. 3 is the beam pattern that the digital array antenna receiving terminal that the inventive method produces obtains radar signal；
Fig. 4 is the beam pattern that the digital array antenna receiving terminal that the inventive method produces obtains signal of communication.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna, the signal for Digital Array Radar is sent out
Send and receive, as it is shown in figure 1, described method comprises the steps:
Step 1, determines that the launching beam weight vector of digital array antenna, described launching beam weight vector make digital array
Radar forms main beam at detection target direction, and the gain on communication base station direction is less than the gain of described main beam.
Transmitting DBF: use and optimize the launching beam weight vector determining digital array antenna so that in detection
Target direction is formed while main beam, forms higher gain in communication base station direction according to communication distance.
In step 1, determining the launching beam weight vector of digital array antenna, its constraints is:
Wherein, W is launching beam weight vector, and a (θ) is steering vector, θ0For radar detection target direction, θ1For communication base
Stand direction, θεFor launching beam secondary lobe direction, δ is the launching beam secondary lobe side in addition to radar detection direction and communication base station direction
To gain.
Step 2, determines the transmitting signal waveform of communication base station, and described transmitting signal waveform is the time domain OFDM of constant modulus value
Signal.
Transmitting signal waveform determines: uses optimization to determine OFDM waveform display method, obtains the ofdm signal of constant modulus value, and make
Bandwidth meet target acquisition and the needs communicated simultaneously.
In step 2, specifically include following sub-step:
(2a) the described OFDM frequency-region signal determining communication base station, its constraints is:
Wherein, S (w) is OFDM frequency-region signal, the normalization of the amplitude of OFDM frequency-region signal, w=[w1, w2..., wN] it is
Sub-carrier frequency vector, N is the sub-carrier frequency number of OFDM frequency-region signal；
(2b) initial sub-CF signal S is producedm, SmFor any string in OFDM frequency-region signal S (w), m=1,2 ..., M,
M is for launching antenna number；
(2c) to initial sub-CF signal SmCarry out inverse discrete Fourier transform, obtain time-domain signalExtract this time domain letter
NumberPhase placeObtain the time-domain signal of constant modulus valueWherein ∠ represents the phase of complex signal
Position, a tan represents and negates tan, and real () and imag () represents respectively and takes real and imaginary part；
(2d) time-domain signal to described constant modulus valueCarry out discrete Fourier transform and obtain frequency-region signalAnd carry
Take frequency-region signalPhase placeObtain the frequency-region signal of constant modulus valueThen the frequency domain of constant modulus value is believed
NumberCarry out inverse discrete Fourier transform and obtain time domain OFDM signal s of constant modulus value.
Step 3, adds Cyclic Prefix to the ofdm signal of described constant modulus value, obtains the ofdm signal of band Cyclic Prefix.
Step 3 specifically includes:
Before time domain OFDM signal s of described constant modulus value, add Cyclic Prefix, utilize formula
Obtain the ofdm signal u of band Cyclic Prefix；
Wherein, NsFor the length of time domain OFDM signal s of constant modulus value, L is the length of Cyclic Prefix, and L ＞ τmax, τmax
=max{ τ1, τ2, wherein τ1Maximum delay for being caused by multipath effect is poor, τ2For the maximum delay caused by target length
Difference.
Add Cyclic Prefix and avoid interference (ISI) and interchannel interference (ICI) between signal code, it is ensured that ofdm signal
Orthogonality be not destroyed.
Step 4, is multiplied the ofdm signal of described band Cyclic Prefix with described launching beam weight vector, completes digital array
The signal of radar is launched.
Step 5, obtains the reception data of described digital array antenna, determines that the radar power of digital array antenna receiving terminal is
Number and right of correspondence coefficient, described radar weight coefficient forms main beam, at communication base station at Digital Array Radar detection target direction
Direction forms zero point, and described right of correspondence coefficient forms zero point, in communication base station direction at Digital Array Radar detection target direction
Form main beam.
Receiving digital beam froming: at the receiving terminal of digital array antenna, first each reception antenna optimizes and determines that two groups connect
Retake the power coefficient W1And W2, referred to as radar weight coefficient and right of correspondence coefficient.
Step 5 specifically includes following sub-step:
(5a) reception data X=Au+n of described digital array antenna are obtainedt, wherein, A=[a (θ0), a (θ1)]T, u is
With the ofdm signal of Cyclic Prefix, ntFor noise signal, T represents transposition, a (θ0) it is the steering vector of radar detection target direction,
a(θ1) it is the steering vector in communication base station direction；
(5b) radar weight coefficient W1Main beam is formed, in communication base station direction shape at Digital Array Radar detection target direction
Becoming zero point, its constraints is:
(5c) right of correspondence coefficient W2Form zero point at Digital Array Radar detection target direction, formed in communication base station direction
Main beam, its constraints is:
Wherein, H represents conjugate transpose, and R is the covariance matrix of reception data X of digital array antenna.
Step 6, obtains Radar channel according to described reception data and described radar weight coefficient and receives signal, clip described thunder
Reach the Cyclic Prefix of Channel Received Signal, the Radar channel without Cyclic Prefix is received signal and carries out matched filtering, thus obtain
Range information to radar target.
Reception data X according to described digital array antenna and described radar weight coefficient W1Obtain Radar channel and receive signal
y1=W1 HX, removes Radar channel and receives signal y1Cyclic Prefix obtain the radar return signal z without Cyclic Prefix1, then
By the described radar return signal z without Cyclic Prefix1Transform to frequency domain to haveThus obtain target
Frequency domain responseIn formula, Z1W () is the radar return signal z without Cyclic Prefix1Frequency-region signal,
For the frequency-region signal of time domain OFDM signal s of constant modulus value, then frequency domain response H (w) of target is done inverse Fourier transform, therefrom
Obtain the range information of radar target.
Step 7, obtains communication channel according to described reception data and described right of correspondence coefficient and receives signal, clips described logical
The Cyclic Prefix of letter Channel Received Signal, receives signal to the communication channel without Cyclic Prefix and carries out channel equalization, phase successively
Dry digital demodulation, thus obtain the data bit flow of communication base station transmission.
According to described reception data X and described right of correspondence coefficient W2Obtain communication channel and receive signalRemove
Communication channel receives signal y2Cyclic Prefix obtain the communications reception signal z without Cyclic Prefix2, to described without circulation before
The communication channel sewed receives signal z2Carry out channel equalization successively, and carry out coherent digital demodulation in base band and obtain communication base station and pass
Defeated data bit flow.
A kind of based on digital array antenna the Radar-Communication Integrated receiving/transmission method that the embodiment of the present invention provides, can be simultaneously
Meet the performance requirement of communication and radar, mainly solve signal based on traditional analog phased array in prior art and launch and receive
The problems such as beam switchover is dumb, and dead-center position control is the most convenient, wave beam low sidelobe is relatively difficult to achieve.By transmission digital beam shape
Become, use and optimize Launch Right vector so that formed relatively in communication base station direction while detection target direction forms main beam
High-gain；Transmitting signal waveform designs, and optimizes the permanent mould ofdm signal of design, transforms to time domain by IFFT, and in time domain waveform
Front addition Cyclic Prefix, delivers to each transmitting antenna with optimization power after each antenna is multiplied, and completes to launch signal process；Receive number
Word Wave beam forming, each reception antenna optimization designs radar weight coefficient and right of correspondence coefficient, and radar weight coefficient is in detection target side
Forming zero point at communication direction to forming main beam, right of correspondence coefficient forms zero point simultaneously at communication direction at radar direction simultaneously
Form main beam；Radar signal reception processes, the reception Wave beam forming adding radar weight coefficient obtain radar signal, removes circulation
Prefix, carries out the matched filtering that frequency domain is divided by and obtains target response；Signal of communication reception processes, by the reception adding right of correspondence coefficient
Wave beam forming obtains signal of communication, removes Cyclic Prefix, then does channel equalization, carries out coherent digital demodulation and obtains signal code,
Signal code symbol decisions is obtained the communication information.The present invention can be same in Radar-Communication Integrated signal emission process
Time form detection target direction main beam make communication base station direction have higher gain, by controlling during signal receives
The dead-center position of beam shaping respectively obtains radar signal and signal of communication so that follow-up radar and signal of communication process mutually
Do not affect, can be used for the signal transmitting and receiving of Radar-Communication Integrated based on digital array antenna.
The effect of the present invention is further illustrated by following emulation experiment:
1, simulated conditions:
The transmitting and the reception antenna number that set Digital Array Radar in this emulation experiment are all M=20, radar detection side
To for θ0=0 °, communication base station direction is θ1=30 °.
2, emulation content:
Emulation 1, uses the inventive method to emulate the launching beam directional diagram of digital array antenna, result such as Fig. 2,
Wherein radar detection direction is main beam, and there is higher gain in communication base station direction simultaneously；
Emulation 2, uses the inventive method that digital array antenna receiving terminal obtains the reception beam pattern of radar signal
Emulate, result such as Fig. 3；
Emulation 3, uses the inventive method that digital array antenna receiving terminal obtains the reception beam pattern of signal of communication
Emulate, result such as Fig. 4；
3, analysis of simulation result:
From figure 2 it can be seen that the digital array antenna launching beam directional diagram designed by the inventive method can be simultaneously
Realizing the function of radar detection and communications, it forms main beam in radar detection direction, has in communication base station direction simultaneously
Higher gain, it is achieved thereby that the emission process of radar-communication integration signal.
From figure 3, it can be seen that the digital array antenna receiving terminal designed by the inventive method obtains connecing of radar signal
Receive beam pattern and can form main beam in radar signal direction, form zero in signal of communication direction and fall into, thus obtain radar
The echo of detection target.Separate, with existing receiving the radar echo signal achieving Radar-Communication Integrated signal in meaning
Signal separating method has bigger difference.
Figure 4, it is seen that the digital array antenna receiving terminal designed by the inventive method obtains connecing of signal of communication
Receive beam pattern and can form main beam in signal of communication direction, form zero in radar detection direction and fall into, thus communicated
The signal of communication of base station.So at the receiving terminal of digital array antenna, it is separately optimized design radar weight coefficient and right of correspondence coefficient
Can be obtained by two groups of signal datas, be respectively used to target acquisition and data communication, it is achieved thereby that radar-communication integration
Signal receives process.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art, in the technical scope that the invention discloses, can readily occur in change or replace, should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (7)
1. a Radar-Communication Integrated receiving/transmission method based on digital array antenna, for the Radar-Communication of Digital Array Radar
Integration signal sends and receives, and Radar-Communication Integrated signal refers to modulate the communication information on radar signal waveform, both
Share a signal waveform, it is characterised in that described method comprises the steps:
Step 1, determines that the launching beam weight vector of digital array antenna, described launching beam weight vector exist in Digital Array Radar
Detection target direction forms main beam, and the gain on communication base station direction is more than 0 and is less than the gain of described main beam；
Step 2, determines the transmitting signal waveform of Digital Array Radar, and described transmitting signal waveform is the time domain OFDM of constant modulus value
Signal；
Step 3, adds Cyclic Prefix to the ofdm signal of described constant modulus value, obtains the ofdm signal of band Cyclic Prefix；
Step 4, is multiplied the ofdm signal of described band Cyclic Prefix with described launching beam weight vector, obtains Digital Array Radar
Transmitting signal, and described transmitting signal is launched；
Step 5, obtains the reception data of described digital array antenna, determine digital array antenna receiving terminal radar weight coefficient and
Right of correspondence coefficient, described radar weight coefficient forms main beam, in communication base station direction at Digital Array Radar detection target direction
Forming zero point, described right of correspondence coefficient forms zero point at Digital Array Radar detection target direction, is formed in communication base station direction
Main beam；
Step 6, obtains Radar channel according to described reception data and described radar weight coefficient and receives signal, to described Radar channel
Receive signal and carry out matched filtering, thus obtain the range information of radar target；
Step 7, obtains communication channel according to described reception data and described right of correspondence coefficient and receives signal, to described communication channel
Receive signal and carry out signal equalization, coherent digital demodulation successively, thus obtain the data bit flow of communication base station transmission.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 1, its feature
Being, in step 1, determining the launching beam weight vector of digital array antenna, its constraints is:
Wherein, W is launching beam weight vector, and a (θ) is the steering vector in θ direction, θ0For radar detection target direction, θ1For communication
Direction, base station, θεFor launching beam secondary lobe direction, δ is the launching beam secondary lobe in addition to radar detection direction and communication base station direction
The gain in direction.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 1, its feature
It is, in step 2, specifically includes following sub-step:
(2a) the described OFDM frequency-region signal determining communication base station, its constraints is:
Wherein, S (w) is OFDM frequency-region signal, the normalization of the amplitude of OFDM frequency-region signal, w=[w1,w2,…,wN] it is that son carries
Frequently vector, N is the sub-carrier frequency number of OFDM frequency-region signal；
(2b) initial sub-CF signal S is producedm, SmFor any string in OFDM frequency-region signal S (w), m=1,2 ..., M, M are
Launch antenna number；
(2c) to initial sub-CF signal SmCarry out inverse discrete Fourier transform, obtain time-domain signalExtract this time-domain signal
Phase placeObtain the time-domain signal of constant modulus valueWherein ∠ represents the phase place of complex signal,
Atan represents and negates tan, and real () and imag () represents respectively and takes real and imaginary part；
(2d) time-domain signal to described constant modulus valueCarry out discrete Fourier transform and obtain frequency-region signalAnd extract frequency domain
SignalPhase placeObtain the frequency-region signal of constant modulus valueThen the frequency-region signal to constant modulus valueEnter
Row inverse discrete Fourier transform obtains time domain OFDM signal s of constant modulus value.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 3, its feature
Being, step 3 specifically includes:
Before time domain OFDM signal s of described constant modulus value, add Cyclic Prefix, utilize formula
Obtain the ofdm signal u of band Cyclic Prefix；
Wherein, NsFor the length of time domain OFDM signal s of constant modulus value, L is the length of Cyclic Prefix, and L > τmax, τmax=max
{τ1,τ2, wherein τ1Maximum delay for being caused by multipath effect is poor, τ2Maximum delay for being caused by target length is poor.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 1, its feature
Being, step 5 specifically includes following sub-step:
(5a) reception data X=Au+n of described digital array antenna are obtainedt, wherein, A=[a (θ0),a(θ1)]T, u is band circulation
The ofdm signal of prefix, ntFor noise signal, subscript T represents transposition, a (θ0) it is the steering vector of radar detection target direction, a
(θ1) it is the steering vector in communication base station direction；
(5b) according to reception data X of described digital array antenna, determine digital array antenna receiving terminal radar weight coefficient and
Right of correspondence coefficient W1, radar weight coefficient W1Main beam is formed, in communication base station direction shape at Digital Array Radar detection target direction
Becoming zero point, its constraints is:
(5c) right of correspondence coefficient W2Form zero point at Digital Array Radar detection target direction, form main ripple in communication base station direction
Bundle, its constraints is:
Wherein, subscript H represents conjugate transpose, and R is the covariance matrix of reception data X of digital array antenna.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 1, its feature
Being, step 6 specifically includes:
Reception data X according to described digital array antenna and described radar weight coefficient W1Obtain Radar channel and receive signal y1=
W1 HX, removes Radar channel and receives signal y1Cyclic Prefix obtain the radar return signal z of non-cycle prefix1, then by described
Radar return signal z without Cyclic Prefix1Transform to frequency domain to haveThe frequency domain thus obtaining target rings
ShouldIn formula, Z1W () is the radar return signal z without Cyclic Prefix1Frequency-region signal,For constant mould
The frequency-region signal of time domain OFDM signal s of value, then frequency domain response H (w) of target is done inverse Fourier transform, therefrom obtain radar
The range information of target.
A kind of Radar-Communication Integrated receiving/transmission method based on digital array antenna the most according to claim 1, its feature
Being, step 7 specifically includes:
According to described reception data X and described right of correspondence coefficient W2Obtain communication channel and receive signalTo described logical
Letter Channel Received Signal y2Carry out signal equalization successively, in base band, communication channel is received signalCarry out coherent digital to demodulate
Data bit flow to communication base station transmission.
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| CN107346017A (en) * | 2017-05-04 | 2017-11-14 | 武汉滨湖电子有限责任公司 | The intensive target simulation method of pulse compression radar based on frequency matching filtering |
| CN108387890A (en) * | 2018-01-30 | 2018-08-10 | 江苏科技大学 | The array resource allocation methods of chance battle array radar tracking communicating integral |
| CN109521426A (en) * | 2017-09-18 | 2019-03-26 | 比亚迪股份有限公司 | The method and device thereof of the angle of target are obtained based on car radar |
| CN110095771A (en) * | 2018-01-31 | 2019-08-06 | 西弗尔斯伊玛有限公司 | Radar beam manufacturing process |
| CN112731295A (en) * | 2017-05-31 | 2021-04-30 | 谷歌有限责任公司 | Radar modulation for radar sensing using wireless communication chipsets |
| CN113655475A (en) * | 2021-08-16 | 2021-11-16 | 电子科技大学 | Radar communication integration method based on waveform selection |
| CN113924769A (en) * | 2019-01-14 | 2022-01-11 | 奥拉智能***有限公司 | Subband and multiband coded OFDM for high resolution radar |
| CN115051901A (en) * | 2022-05-26 | 2022-09-13 | 南京邮电大学 | Radar communication integration method and system based on subcarrier multiplexing OFDM |
| CN115085747A (en) * | 2022-06-23 | 2022-09-20 | 扬州宇安电子科技有限公司 | Radar and communication integrated receiving system |
| CN115442199A (en) * | 2022-08-30 | 2022-12-06 | 西安电子科技大学 | CP-free MIMO-OFDM integrated signal design and processing method |
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| CN106772350A (en) * | 2017-01-16 | 2017-05-31 | 西安电子科技大学 | The method that radar detection and communications are realized based on linear FM signal |
| CN106772350B (en) * | 2017-01-16 | 2019-05-07 | 西安电子科技大学 | The method for realizing radar detection and communications based on linear FM signal |
| CN106911605A (en) * | 2017-03-01 | 2017-06-30 | 哈尔滨工业大学 | A kind of radar-communication integration Waveform generation method based on FMCW |
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| CN107346017B (en) * | 2017-05-04 | 2019-10-01 | 武汉滨湖电子有限责任公司 | The intensive target simulation method of pulse compression radar based on frequency matching filtering |
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| CN110095771A (en) * | 2018-01-31 | 2019-08-06 | 西弗尔斯伊玛有限公司 | Radar beam manufacturing process |
| CN113924769A (en) * | 2019-01-14 | 2022-01-11 | 奥拉智能***有限公司 | Subband and multiband coded OFDM for high resolution radar |
| US11936477B2 (en) | 2019-01-14 | 2024-03-19 | Aura Intelligent Systems, Inc. | Sub-band and multi-band coded OFDM for high-resolution radar |
| CN113655475A (en) * | 2021-08-16 | 2021-11-16 | 电子科技大学 | Radar communication integration method based on waveform selection |
| CN113655475B (en) * | 2021-08-16 | 2023-06-20 | 电子科技大学 | Radar communication integration method based on waveform selection |
| CN115051901A (en) * | 2022-05-26 | 2022-09-13 | 南京邮电大学 | Radar communication integration method and system based on subcarrier multiplexing OFDM |
| CN115051901B (en) * | 2022-05-26 | 2023-11-14 | 南京邮电大学 | Radar communication integrated method and system based on subcarrier multiplexing OFDM |
| CN115085747A (en) * | 2022-06-23 | 2022-09-20 | 扬州宇安电子科技有限公司 | Radar and communication integrated receiving system |
| CN115442199A (en) * | 2022-08-30 | 2022-12-06 | 西安电子科技大学 | CP-free MIMO-OFDM integrated signal design and processing method |
| CN115442199B (en) * | 2022-08-30 | 2024-04-16 | 西安电子科技大学 | CP-free MIMO-OFDM integrated signal design and processing method |
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