CN106911605A - A kind of radar-communication integration Waveform generation method based on FMCW - Google Patents
A kind of radar-communication integration Waveform generation method based on FMCW Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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Abstract
A kind of radar-communication integration Waveform generation method based on FMCW, the radar-communication integration Waveform generation method the present invention relates to be based on FMCW.Resource is excessively taken the invention aims to solve existing radar and communications system, it is relatively costly, it is also easy to produce the shortcoming of electromagnetic interference.Detailed process is：Step one, generation radar linear frequency modulation continuous wave (FMCW)；Step 2, generation communication data, carry out QPSK modulation, the communication data after being modulated by communication data；Step 3, the communication data after modulation is loaded on radar linear frequency modulation continuous wave (FMCW), generation radar-communication integration waveform QPSK FMCW signals s (t)；QPSK is QPSK.The present invention is used for radar communication field.
Description
Technical field
Radar-communication integration Waveform generation method the present invention relates to be based on FMCW.
Background technology
In recent years, radar-communication integration technology can simultaneously realize the spy of target acquisition and data-transformation facility due to it
Point, and receive extensive concern.Realize radar and communications system integration contribute to realize equip generalization, miniaturization and
Multifunction, it is to avoid excessively take resource, reduces cost is of great practical significance.
At present, realize that the integrated method of radar communications system is broadly divided into two kinds：One kind is radar and communications function
Common hardware system, but transmitting radar and communications signal realizes corresponding function respectively；Another method is radar and communications
Function common hardware system is come to realize two kinds of functions simultaneously with transmission signal.Due to realizing shared energy of two kinds of functions on signal
Reach farthest cost-effective and utilize resource, therefore need a kind of integrated shared signal of system design.Radar and communications
The method that function shares Design of Signal has two kinds：One kind is based on signal of communication, such as orthogonal frequency-division multiplex singal (OFDM)；It is another
It is, based on radar signal, communication data to be loaded in radar signal to plant, and such as carries out minimum frequency shift key to linear frequency modulation (LFM) signal
The modulation such as control (MSK), binary phase shift keying (BPSK).Both the above method can obtain ideal effect, but OFDM believes
Number height power ratio limit its detection range, and the method that communication data is modulated to radar pulse signal is again limited
The transmission rate of communication data, it is impossible to realize radar and communications function while very well.
The content of the invention
Resource is excessively taken the invention aims to solve existing radar and communications system, it is relatively costly, it is also easy to produce
The shortcoming of electromagnetic interference, and propose a kind of radar-communication integration Waveform generation method based on FMCW.
A kind of radar-communication integration Waveform generation method based on FMCW is specifically what is followed the steps below：
Step one, generation radar linear frequency modulation continuous wave (FMCW)；
Step 2, generation communication data, carry out QPSK modulation, the communication data after being modulated by communication data；
Step 3, the communication data after modulation is loaded on radar linear frequency modulation continuous wave (FMCW), generation radar leads to
Integrated waveform QPSK-FMCW signals s (t) of letter；
QPSK is QPSK.
Beneficial effects of the present invention are：
Existing integration signal has that detection range is limited or traffic rate, it is impossible to reality while very well
Existing radar and communications function.Target acquisition and communication function need to be simultaneously realized in view of shared signal, system occupancy resource is few, into
This is low, it is to avoid produce electromagnetic interference, the present invention to have selected QPSK (QPSK) modulation system to realize that data are transmitted, choosing
Select linear frequency modulation continuous wave (FMCW) and realize target acquisition as the carrier wave of signal.The signal generated with this, referred to as QPSK-
FMCW signal, as the shared signal of radar and communications system.
QPSK-FMCW signals, can simultaneously realize radar and communications function.Can be realized in the case where communication is ensured
To the radar detection function in monitored area, its target acquisition ability phase that the FMCW signal in radar system is applied to tradition
When.And because QPSK-FMCW signals can regard the QPSK signals of communication that carrier frequency is modulated as, it has preferable communicativeness simultaneously
Energy.To sum up shown, QPSK-FMCW signals can be applied effectively in radar-communication integration system, waveform envelope stabilization, had
Good target acquisition ability, and do not influence its communication function after carrying out power amplification.
FMCW signal has without blind range zone, and multiple target detection characteristic is capable of achieving target high resolution detection and is accurately positioned
Advantage.FMCW signal is applied in radar-communication integration system, effectively the target in monitored area can be carried out
Detection, and the characteristic of its continuous wave can ensure real-time transmission and the transmission rate of signal of communication.
QPSK-FMCW signals modulate on FMCW carrier waves communication data in QPSK modes so that the integrated waveform letter
Number the radar detection ability of FMCW signal was both maintained, and while carrying communication data information again, it is entered in monitored area
Communicated while row target acquisition so that system can directly obtain target information from signal is received and come real with communication data
The integration operation of existing radar and communications.
As shown in Figure 3, Figure 4, QPSK-FMCW signals are suitable with the target acquisition result of FMCW signal, it is seen that integrated ripple
Data modulation is carried out for FMCW have little to no effect its target acquisition performance in shape signal.
QPSK-FMCW signal data rates are respectively 40kb/s (N=20) and 4Mb/s (N=2000), QPSK signals in Fig. 5
Data transfer rate is identical during with integration signal N=20.Contrast bit error rate result is not it can be found that carrier frequency modulation is to integration
Signal communication performance produces influence, meanwhile, when using FMCW signal as communication carrier, the difference of data transfer rate is not to error code
Rate produces influence.
Brief description of the drawings
Fig. 1 is FMCW signal time-frequency figure, and FMCW is linear frequency modulation continuous wave；
Fig. 2 a are initial FMCW carrier signal waveforms generation schematic diagram, and time is the time, and ms is millisecond；
Fig. 2 b are the sequence of symhols waveform to be modulated generation schematic diagram；
Fig. 2 c are the QPSK-FMCW signal waveforms generation schematic diagram obtained after modulating, and QPSK-FMCW is quadrature phase shift key
Control-linear frequency modulation continuous wave；
Fig. 3 is FMCW signal target acquisition result schematic diagram, and range is distance, and m is rice, and Doppler frequency are
Doppler frequency, Hz is hertz；
Fig. 4 is QPSK-FMCW signal target result of detection schematic diagrames；
Fig. 5 is bit error rate result schematic diagram, and SNR in dB represent that BER is bit error rate with dB for signal to noise ratio；
Fig. 6 is product structure schematic diagram of the present invention, bkIt is k-th code element.
Specific embodiment specific embodiment one：Present embodiment is illustrated with reference to Fig. 6, one kind of present embodiment is based on
The radar-communication integration Waveform generation method of FMCW is specifically what is followed the steps below：
Step one, generation radar linear frequency modulation continuous wave (FMCW)；
Step 2, generation communication data, carry out QPSK modulation, the communication data after being modulated by communication data；
Step 3, the communication data after modulation is loaded on radar linear frequency modulation continuous wave (FMCW), generation radar leads to
Integrated waveform QPSK-FMCW signals s (t) of letter；
QPSK is QPSK.
Specific embodiment two：Present embodiment from unlike specific embodiment one：Thunder is generated in the step one
Up to linear frequency modulation continuous wave (FMCW)；Detailed process is：
Target acquisition and communication function need to be simultaneously realized in view of shared signal, the present invention have selected QPSK
(QPSK) modulation system come realize data transmit, selection linear frequency modulation continuous wave (FMCW) realize target as the carrier wave of signal
Detection.The signal generated with this, referred to as QPSK-FMCW signals, as the shared signal of radar and communications system.
FMCW signal has without blind range zone, and multiple target detection characteristic is capable of achieving target high resolution detection and is accurately positioned
Advantage.FMCW signal is applied in radar-communication integration system, effectively the target in monitored area can be carried out
Detection, and the characteristic of its continuous wave can ensure real-time transmission and the transmission rate of signal of communication.
As shown in figure 1, set the FMCW signal of radar signal period as：
FMCW is radar linear frequency modulation continuous wave；
Wherein, f0It is radar carrier frequency, μ=B/T is radar chirp rate, and B is radar bandwidth, and T represents radar signal
Cycle, t is the duration, and rect () is rectangular window function,J is imaginary number, j2=-1.
Other steps and parameter are identical with specific embodiment one.
Specific embodiment three：Present embodiment from unlike specific embodiment one or two：It is raw in the step 2
Into communication data, QPSK modulation is carried out, the data after being modulated；Detailed process is：
If the communication data symbol sequence of required transmission is A=[a1,a2,...,ak,...,aM], k=1,2 ..., M its
Middle akK-th code element is represented, is quaternary number evidence, ak∈{0,1,2,3}.Communication data is carried out into QPSK modulation, then k-th yard
Unit phase modulation beData after being modulated are exp { j θk}。
Other steps and parameter are identical with specific embodiment one or two.
Specific embodiment four：Unlike one of present embodiment and specific embodiment one to three：The step 3
The middle communication data by after modulation is loaded on radar linear frequency modulation continuous wave (FMCW), generates radar-communication integration waveform
QPSK-FMCW signals s (t)；Detailed process is：
Communication data exp { the j θ that will be obtained after modulationkBe loaded on the existing CW with frequency modulation of radar and obtain
sk(t)=x (t) exp { j θk},(k-1)Tsym≤t<kTsym (2)
Wherein,It is communication symbol width, N is the number of symbols of single FMCW cycles internal modulation, and N values are for just
Integer, obtaining communication signal data rate isskT () represents the kth of radar-communication integration waveform QPSK-FMCW signals
Individual communication code element；
Then signal period QPSK-FMCW signals s (t) is expressed as
In sum, QPSK-FMCW signals modulate on FMCW carrier waves communication data in QPSK modes so that this is integrally
Change waveform signal and both maintained the radar detection ability of FMCW signal, while carrying communication data information again, make it in monitoring
Carry out being communicated while target acquisition in region so that system directly can obtain target information and communicate from signal is received
Integration of the data to realize radar and communications is operated.
Other steps and parameter are identical with one of specific embodiment one to three.
Beneficial effects of the present invention are verified using following examples：
Embodiment one：
A kind of radar-communication integration Waveform generation method detailed process based on FMCW of the present embodiment is：
If radar signal carrier frequency f0=1.5GHz, radar FMCW signal cycle T=1ms, radar bandwidth B=25MHz；
The modulated process of radar-communication integration signal is as shown in Fig. 2 a, Fig. 2 b, Fig. 2 c.Wherein Fig. 2 a are initial FMCW carrier waves letter
Number, Fig. 2 b are the communication sequence of symhols to be modulated, and Fig. 2 c are the QPSK-FMCW signal results obtained after modulating.
To study the target acquisition performance of QPSK-FMCW signals, integration signal is simulated herein carries out target acquisition
Scene.We assume that there are three targets in monitored area, its parameter is as follows：Target range is respectively R1=250m, R2=250m
And R3=400m, corresponding Doppler frequency shift is fd1=100Hz, fd2=-100Hz and fd3=100Hz.Using FMCW signal with
QPSK-FMCW signals carry out the result of target acquisition as shown in Figure 3, Figure 4.
As shown in Figure 3, Figure 4, QPSK-FMCW signals are suitable with the target acquisition result of FMCW signal, it is seen that integrated ripple
Data modulation is carried out for FMCW have little to no effect its target acquisition performance in shape signal.
Bit error rate (BER) is generally used to the communication capacity of assessment signal.Due to during data receipt, only phase
Information is retained, therefore proposes that the carrier frequency modulation of waveform does not produce influence to data demodulation.In order to verify that it leads to
Letter performance, QPSK-FMCW signals and the bit error rate of the QPSK signals under Gaussian white noise channel (AWGN) in this simulation comparison.
Assuming that communication data is 2 × 105Bit, QPSK-FMCW signal data rates are respectively 40kb/s (N=20) in Fig. 5
With 4Mb/s (N=2000), data transfer rate is identical when QPSK signals are with integration signal N=20.Contrast bit error rate result can be sent out
Existing, carrier frequency modulation does not produce influence to integration signal communication performance, meanwhile, carried as communication FMCW signal is used
During ripple, the difference of data transfer rate does not produce influence to the bit error rate.
The present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, this area
Technical staff works as can make various corresponding changes and deformation according to the present invention, but these corresponding changes and deformation should all belong to
The protection domain of appended claims of the invention.
Claims (4)
1. a kind of radar-communication integration Waveform generation method based on FMCW, it is characterised in that the method detailed process is：
Step one, generation radar linear frequency modulation continuous wave；
Step 2, generation communication data, carry out QPSK modulation, the communication data after being modulated by communication data；
Step 3, the communication data after modulation is loaded on radar linear frequency modulation continuous wave, generates radar-communication integration ripple
Shape QPSK-FMCW signals s (t)；
QPSK is QPSK, and FMCW is radar linear frequency modulation continuous wave.
2. a kind of radar-communication integration Waveform generation method based on FMCW according to claim 1, it is characterised in that：Institute
State generation radar linear frequency modulation continuous wave in step one；Detailed process is：
If the FMCW signal of radar signal period is：
Wherein, f0It is radar carrier frequency, μ=B/T is radar chirp rate, and B is radar bandwidth, and T represents radar signal cycle, t
It is the duration, rect () is rectangular window function,J is imaginary number, j2=-1.
3. a kind of radar-communication integration Waveform generation method based on FMCW according to claim 2, it is characterised in that：Institute
State and generate communication data in step 2, communication data is carried out into QPSK modulation, the communication data after being modulated；Detailed process
For：
If the communication data symbol sequence of required transmission is A=[a1,a2,...,ak,...,aM], k=1,2 ..., M, M value be
Positive integer, wherein akK-th code element is represented, is quaternary number evidence, ak∈{0,1,2,3}；Communication data is carried out into QPSK modulation,
Then the phase modulation of k-th code element isCommunication data after being modulated is exp { j θk}。
4. a kind of radar-communication integration Waveform generation method based on FMCW according to claim 3, it is characterised in that：Institute
State and the communication data after modulation is loaded on radar linear frequency modulation continuous wave in step 3, generate radar-communication integration waveform
QPSK-FMCW signals s (t)；Detailed process is：
Communication data exp { the j θ that will be obtained after modulationkBe loaded on the existing CW with frequency modulation of radar and obtain
sk(t)=x (t) exp { j θk},(k-1)Tsym≤t<kTsym (2)
Wherein,It is communication symbol width, N is the number of symbols of single FMCW cycles internal modulation, and N values are positive integer,
Obtaining communication signal data rate isskT () represents that k-th of radar-communication integration waveform QPSK-FMCW signals leads to
Letter code element；
Then signal period radar-communication integration waveform QPSK-FMCW signals s (t) is expressed as
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| CN108512797A (en) * | 2018-03-21 | 2018-09-07 | 电子科技大学 | A kind of radar-communication integration Design of Signal method based on orthogonal frequency division multiplexing |
| CN108600138A (en) * | 2018-04-25 | 2018-09-28 | 重庆大学 | Radar-communication integration receiver carrier synchronization method |
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| KR20220092143A (en) * | 2020-12-24 | 2022-07-01 | 한국항공우주연구원 | Apparatus and method for performing data communication using radar a signal |
| CN114935754A (en) * | 2022-07-20 | 2022-08-23 | 深圳芯盛思技术有限公司 | Frequency modulation continuous wave radar modulation system adopting digital modulation technology and use method |
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| CN110261848A (en) * | 2019-07-25 | 2019-09-20 | 北京邮电大学 | Radar-communication integration collaborative detection method and device based on beam power distribution |
| US11774592B2 (en) | 2019-09-18 | 2023-10-03 | Infineon Technologies Ag | Multimode communication and radar system resource allocation |
| CN110808931A (en) * | 2019-10-15 | 2020-02-18 | 四川九洲防控科技有限责任公司 | Communication method, working mode switching method, radar and radar system |
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