CN105162742B - A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method - Google Patents
A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method 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
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/103—Chirp modulation
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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
- G01S7/35—Details of non-pulse systems
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Abstract
A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method, which is asymmetrical triangle, is made of two sections of opposite linear FM signals of tune frequency symbol, it is first determined the bandwidth B of integral system and time width T；System time width T is divided into two sections, time span is respectively T1, T2；Two sections of linear FM signal tuning rate symbols calculate the tuning rate of two sections of linear FM signals on the contrary, bandwidth B is identical respectively；First segment signal is used to carry out the synchronization acquistion of signal of communication, does not modulate the communication information；Second segment signal subsection modulation communication bit information；Ensure two segment signal Phase Continuations, finally obtain expression formula of the integration signal on entire time width T.The present invention can realize the waveform integration of radar and signal of communication, the synchronization of communication system is used for by the use of sectoral integration signal as synchronizing sequence, remainder integration signal segmentation modulation communication bit information, entire integration signal to be as radar emission signal.
Description
Technical field
This hair proposes a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform and determines method, can be adapted for
Based on the radar-communication integration Waveform Design that signal is shared, belong to radar communication waveform modulated field.
Background technology
It is fought with the development and the information-based needs fought, the form of war of technology from single weapon platform to system pair
Anti-rotation becomes, the comprehensive integrated trend for being implemented as following military electronic systems development of multifunction electronic system.Radar communication
Signal integration has great significance for promoting the comprehensive performance of electronic system.Exploring the design method of integrated waveform is
The primary study content of radar communication signal integrated technique.
During radar-communication integration is realized, in order to realize radar function and communication function, generally use timesharing,
Frequency dividing transmission or the mode of multi-beam space division.But both modes are not the integrations of Radar-Communication letter signal waveform.
Starting stage is remained in based on the integral system that waveform is shared, is mainly linear frequency modulation letter using shared signal
Number (Chirp), by changing the parameter of linear FM signal come modulation communication information, but this mode changes the band of signal
Wide and time width so that the operating distance and resolution ratio of radar can all change, so as to affect the detection performance of radar.
In integrated Waveform Design based on Fourier Transform of Fractional Order, using different original frequencies to user data into
Row modulation has reached the transmission of single Chirp signal multi-bits information, but the common drawback of such system is the transmission rate of communication
Related with Chirp rates, under identical bandwidth condition, the spectrum efficiency of communication is low.
Invention content
The technology of the present invention solves the problems, such as：Overcome the deficiencies in the prior art is pointed out, provides a kind of asymmetric triangle frequency modulation
Radar-communication integration signal waveform determines method, and this method can be real in the case where keeping system bandwidth and time width constant
The waveform integration of existing radar and signal of communication, by the use of sectoral integration signal as synchronizing sequence for the same of communication system
Step, remainder integration signal segmentation modulation communication bit information.Entire integration signal is as radar emission signal.One
Change Waveform Design is simple, and Project Realization is easy.
The present invention technical solution be：A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform side of determining
Method includes the following steps：
(1) it is exported according to the radar slant-range resolution ratio of setting, the mean power of radar transmitter output, radar transmitter
Peak power and pulse recurrence frequency PRF, the bandwidth B determined respectively and time width T；
(2) step (1) time width T is divided to for two sections, respectively [0:T1], [T1:T], two sections of time spans are respectively T1With
T2, 0≤T1≤T2, T2=T-T1；
(3) according to the T determined in step (2)1And T2, the bandwidth B for the system for keeping step (1) determining is constant, calculates respectively
Integrated waveform first part frequency modulation rate k1=B/T1And second part frequency modulation rate k2=-B/T2；
(4) the frequency modulation rate k obtained according to step (3)1, k2, in the case where ensureing signal time domain, Phase Continuation, obtain
[0:T1] on signal expression formula s1' (t), [T1:T] on signal expression formula s2'(t)；
(5) when modulation communication information, the not s in modulation step (4)1' (t), by the s in step (4)2' (t), in [T1:
T] in, the averagely expression formula s of signal new after segmentation modulation communication bit information2(t), it is as follows；
C (n)=2randint (1, N, (0,1)) -1, N is represented in [T in formula1:T] N-bit communication data has been modulated altogether,
N is represented in [T1:T] on the n-th bit data for modulating；2randint (1, N, (0,1)) -1 represents the random of generation N number of 1 or -1
Number, Δ T represent the time span of one bit information of modulation, wherein Δ T >=T1。
(6) s obtained according to step (4)1' the obtained s of (t) and step (5)2(t), the table of integrated composite signal is obtained
Up to formula s (t), used using the obtained integration composite signal s (t) while as radar signal and signal of communication, that is, realize thunder
Up to the integration of communication signal waveforms, s (t) is as follows：
S (t)=s1'(t)+s2(t)
According to the radar slant-range resolution ratio ρ of settingr, determine the bandwidth B of system, formula is as follows：
In formula, c=3 × 108M/s is the light velocity；ρrFor slant range resolution.
Slant range resolution ρrValue for more than 0.15, preferably 0.15 to 50 meters；
According to mean power, peak power and pulse recurrence frequency PRF that the radar transmitter of setting exports, system is determined
Time width T, formula is as follows：
In formula, PavFor the mean power of radar transmitter output, PtFor the peak power of radar transmitter output, PRF is
Pulse recurrence frequency.
The mean power of radar transmitter output set is 100 watt to 1000 watts.
For the peak power of radar transmitter output set as 1 kilowatt to 10 kilowatts, the size of peak power set point value is big
In the value of mean power.
The pulse recurrence frequency PRF set is 1000Hz to 9000Hz.
The advantages of the present invention over the prior art are that：
(1) integration signal designed by the present invention, radar and signal of communication all take full advantage of time domain and frequency domain resource,
Radar system and communication system are worked using identical time and frequency, are realized under the premise of time and frequency domain resource is saved
The integration of radar communication waveform.
(2) integration signal proposed in the present invention by the combination of the opposite polarity LFM signals of two sections of tuning rates, is protected
Demonstrate,proved system bandwidth it is constant while so that synchronizing sequence and modulated bit information signal have certain orthogonality, so as to
To realize the capture of synchronizing sequence.This waveform design method has practicability and novelty.
(3) integration signal that proposes in the present invention can pass through the channel circumstance to communication system and radar performance
Lower optimization is constrained jointly to obtain modulating how many bit communications data on single Chirp signals, is ensureing to communicate and radar performance
Under the premise of improve the transmission rate of communication.
(4) slant range resolution ρ of the present inventionrValue for more than 0.15, by the hardware water of the signal generator on low orbit satellite
Flat limitation, bandwidth B is less than 1GHz, Preferable scheme is that ρrValue for 0.15 to 50 meters, suitable for generally should for radar detection
With resolution ratio can reach the performance requirement of current radar detection.
(5) mean power of radar transmitter output that the present invention is set is 100 watt to 1000 watts.The radar emission of setting
The peak power of machine output is 1 kilowatt to 10 kilowatts, and the size of peak power set point value is more than the value of mean power, preferred side
Case is 1 kilowatt to 10 kilowatts of the peak power in the radar-communication integration system of low rail (400 to 800 kilometers), and radar receives
The signal-to-noise ratio of machine can reach more than 10dB, realize the capability improving of radar detection target, and detection target is accurate.
(6) for the pulse recurrence frequency PRF that the present invention is set as 1000Hz to 9000Hz, PRF generates meeting in more than 9000Hz
Lead to the problem of range ambiguity, preferred scheme is PRF in 1000Hz to 9000Hz, can realize the purpose for detecting target.
Description of the drawings
Fig. 1 is the process flow block diagram of the present invention；
Fig. 2 is the frequency curve schematic diagram of non-symmetric triangular frequency modulated(FM) radar communicating integral signal；
Fig. 3 is based on the integrated radar-communication integration system transmitting terminal block diagram of signal waveform.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
The present invention basic ideas be：A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method,
The frequency curve shape of the integration signal waveform is asymmetrical triangle, is believed by two sections of opposite linear frequency modulations of tune frequency symbol
Number composition, waveform design method is as follows：The bandwidth B of integral system and time width T are determined first；System time width T is divided into two sections,
Time span is respectively T1, T2, 0≤T1≤T2；Two sections of linear FM signal tuning rate symbols are counted respectively on the contrary, bandwidth B is identical
Calculate the tuning rate of two sections of linear FM signals；First segment signal is used to carry out the synchronization acquistion of signal of communication, not modulation communication
Information；Second segment signal subsection modulation communication bit information；Ensure two segment signal Phase Continuations, finally obtain integration signal and exist
Expression formula on entire time width T.The present invention can realize the waveform integration of radar and signal of communication, be believed using sectoral integration
Number as synchronizing sequence be used for communication system synchronization, remainder integration signal segmentation modulation communication bit information.Entirely
Integration signal is as radar emission signal.
As shown in figure 3, a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines system, including：One
Change waveform generating module, radar transmitter, radar beam and form unit, duplexer and antenna；
Integrated waveform generating module, including：Communications encoder, communication encryption processing module, radar RF pulse generators,
Radar modulator；
Communications encoder, receive communication data, and carry out coding send to encryption processing module be encrypted after obtain it is pending
Send signal of communication；
Radar RF pulse generators generate bandwidth B and the radar radio-frequency pulse of time width T, are treated after sending to radar modulator
The radar signal of transmission；
Radar signal to be sent is divided into N sections, signal of communication to be sent is believed respectively with radar to be sent after segmentation
Number carry out dot product, obtain integration signal, after radar transmitter is modulated up-conversion, list formed by radar beam
Member carries out Wave beam forming to the signal after up-conversion.Duplexer is as transmit-receive switch, during transmitting, closes receiver entrance, big work(
Rate radio-frequency pulse is sent into radio-frequency antenna and is launched, and during reception, closes transmitter path, faint backward energy receives.By
It is an asymmetrical triangle in the signal frequency curve designed by the present invention, therefore is referred to as a kind of asymmetric triangle frequency modulation thunder
Up to communicating integral signal waveform.
A kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method, includes the following steps：
(1) it is exported according to the radar slant-range resolution ratio of setting, the mean power of radar transmitter output, radar transmitter
Peak power and pulse recurrence frequency PRF, the bandwidth B determined respectively and time width T；
According to the radar slant-range resolution ratio ρ of settingr, determine the bandwidth B of system, formula is as follows：
In formula, c=3 × 108M/s is the light velocity；ρrFor slant range resolution.
Slant range resolution ρrValue for more than 0.15, limited by the level of hardware of the signal generator on low orbit satellite,
Bandwidth B is less than 1GHz, Preferable scheme is that ρrValue for 0.15 to 50 meters, suitable for the commonly used of radar detection, resolution ratio
The performance requirement of current radar detection can be reached.
According to mean power, peak power and pulse recurrence frequency PRF that the radar transmitter of setting exports, system is determined
Time width T, formula is as follows：
In formula, PtFor the peak power of radar transmitter output, PavFor the mean power of radar transmitter output, PRF is
Pulse recurrence frequency.The mean power of radar transmitter output set is 100 watt to 1000 watts.The radar transmitter of setting is defeated
The peak power gone out is 1 kilowatt to 10 kilowatts, and the size of peak power set point value is more than the value of mean power, Preferable scheme is that
In the radar-communication integration system of low rail (400 to 800 kilometers), 1 kilowatt to 10 kilowatts of peak power, radar receiver
Signal-to-noise ratio can reach more than 10dB, realize the capability improving of radar detection target, and detection target is accurate.The pulse of setting repeats
Frequency PRF is 1000Hz to 9000Hz, and PRF can cause target to lead to the problem of range ambiguity, preferred scheme in more than 9000Hz
It is PRF 1000 to 9000, can realizes the accuracy of the function of detection target, is i.e. accurate detection target.
(2) the time width T of step (1) system is divided to for two sections, respectively [0:T1], [T1:T], two sections of time spans are respectively
T1And T2, 0≤T1≤T2, T2=T-T1.As shown in Figure 2.
(3) according to the T determined in step (2)1And T2, the bandwidth B for the system for keeping step (1) determining is constant, calculates respectively
Integrated waveform first part frequency modulation rate k1=B/T1And second part frequency modulation rate k2=-B/T2；Wherein [0:T1] on linear tune
Frequency Design of Signal be communication system in synchronizing sequence, [T1:T] on signal will be segmented modulation communication bit information.
Meanwhile this design method ensure that radar system bandwidth B is constant.
(4) the frequency modulation rate k obtained according to step (3)1, k2, in the case where ensureing signal time domain, Phase Continuation, obtain
[0:T1] on signal expression formula s1' (t), [T1:T] on signal expression formula s2'(t)；
(5) when modulation communication information, the not s in modulation step (4)1' (t), by the s in step (4)2' (t), in [T1:
T] in, the averagely expression formula s of signal new after segmentation modulation communication bit information2(t), it is as follows；
C (n)=2randint (1, N, (0,1)) -1, N is represented in [T in formula1:T] N-bit communication data has been modulated altogether,
N is represented in [T1:T] on the n-th bit data for modulating；2randint (1, N, (0,1)) -1 represents the random of generation N number of 1 or -1
Number, Δ T represent the time span of one bit information of modulation.Wherein Δ T >=T1, ensure that modulation intelligence can be demodulated correctly.
(6) s obtained according to step (4)1' the obtained s of (t) and step (5)2(t), the table of integrated composite signal is obtained
Up to formula s (t), used using the obtained integration composite signal s (t) while as radar signal and signal of communication, that is, realize thunder
Up to the integration of communication signal waveforms, s (t) is as follows：
S (t)=s1'(t)
Embodiment：
As shown in Figure 1, the process flow block diagram for the present invention, as shown in Figure 1, the present invention propose a kind of asymmetric triangle tune
Frequency radar-communication integration signal waveform, specific implementation step are as follows：
(1) assume system bandwidth B=70MHz, time width T=500us；
(2) assume T1=100us, T2=T-T1=400us；
(3) according to step (1) and (2), k is calculated1=(70 × 106)/(100×10-6)=0.7 × 1012；k2=-
(70×106)/(400×10-6)=- 0.175 × 1012；
(4) according to step (2) and (3), signal s is obtained1' (t), s2' (t) expression formula：
(5) according to step (4) and step (2), s1(t) as the synchronizing signal in communication system, not modulation intelligence, therefore
First part's signal s in integration signal s (t)1(t) expression formula is constant：
(6) according to step (1), system bandwidth B=70MHz, it is assumed that system uses rate fs=70MHz, therefore Δ T=T2/N
=10-4S；According to step (2), it is assumed that modulation 4bit communication datas, therefore N=4 according to step (4) and step (2), are being modulated
After the communication information, integration signal second part s2(t) expression formula is：
(7) according to step (5) and (6), the expression formula of radar-communication integration signal waveform is obtained：
By the specific embodiment of the invention as can be seen that a kind of asymmetric triangle frequency modulated(FM) radar provided by the present invention leads to
Believe integration signal waveform determining method, radar and signal of communication all take full advantage of time domain and frequency domain resource, radar system and
Communication system is worked using identical time and frequency, and radar communication is realized under the premise of time and frequency domain resource is saved
The integration of waveform.By the combination of the opposite polarity LFM signals of two sections of tuning rates, it ensure that system bandwidth is constant while causes
Synchronizing sequence and the signal for having modulated bit information have certain orthogonality, so as to realize the capture of synchronizing sequence.This
Kind waveform design method has practicability and novelty.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (5)
1. a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform determines method, which is characterized in that including following step
Suddenly：
(1) peak value exported according to the radar slant-range resolution ratio of setting, the mean power of radar transmitter output, radar transmitter
Power and pulse recurrence frequency PRF, the bandwidth B determined respectively and time width T；According to the radar slant-range resolution ratio ρ of settingr, determine
The bandwidth B of system, formula are as follows：
In formula, c=3 × 108M/s is the light velocity；ρrFor slant range resolution；
According to the radar transmitter of setting export mean power, peak power and pulse recurrence frequency PRF, determine system when
Wide T, formula are as follows：
In formula, PavFor the mean power of radar transmitter output, PtFor the peak power of radar transmitter output, PRF is pulse
Repetition rate；
(2) the time width T of step (1) is divided to for two sections, respectively [0:T1], [T1:T], two sections of time spans are respectively T1And T2, 0
≤T1≤T2, T2=T-T1；
(3) according to the T determined in step (2)1And T2, the bandwidth B for keeping step (1) determining is constant, calculates integrated waveform respectively
First part frequency modulation rate k1=B/T1And second part frequency modulation rate k2=-B/T2；
(4) the frequency modulation rate k obtained according to step (3)1, k2, in the case where ensureing signal time domain, Phase Continuation, obtain [0:T1]
The expression formula s of upper signal1' (t), [T1:T] on signal expression formula s2'(t)；
In formula, A is the amplitude of normalized signal,Function
(5) when modulation communication information, the not s in modulation step (4)1' (t), by the s in step (4)2' (t), in [T1:T]
It is interior, the averagely expression formula s of signal new after segmentation modulation communication bit information2(t), it is as follows；
C (n)=2randint (1, N, (0,1)) -1, N is represented in [T in formula1:T] N-bit communication data has been modulated altogether, n is represented
In [T1:T] on the n-th bit data for modulating；2randint (1, N, (0,1)) -1 represents to generate N number of 1 or -1 random number, Δ T
Represent the time span of one bit information of modulation, wherein T1≤ΔT≤T2；
(6) s obtained according to step (4)1' the obtained s of (t) and step (5)2(t), the expression formula s of integrated composite signal is obtained
(t), it uses the obtained integration composite signal s (t) while as radar signal and signal of communication, realizes radar communication letter
The integration of number waveform, s (t) are as follows：
S (t)=s1'(t)+s2(t),
Wherein：
2. a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform according to claim 1 determines method,
It is characterized in that：Slant range resolution ρrValue be 0.15 meter to 50 meters.
3. a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform according to claim 1 determines method,
It is characterized in that：The mean power of radar transmitter output set is 100 watt to 1000 watts.
4. a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform according to claim 1 determines method,
It is characterized in that：For the peak power of radar transmitter output set as 1 kilowatt to 10 kilowatts, the size of peak power set point value is big
In the value of mean power.
5. a kind of asymmetric triangle frequency modulated(FM) radar communicating integral signal waveform according to claim 1 determines method,
It is characterized in that：The pulse recurrence frequency PRF set is 1000Hz to 9000Hz.
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| CN106772336B (en) * | 2017-02-28 | 2019-09-03 | 西安电子科技大学 | Radar detection and the integrated system of communication check and implementation method |
| CN107370700B (en) * | 2017-07-05 | 2021-09-07 | 厦门声戎科技有限公司 | Frequency modulation waveform-based detection and communication integrated signal design device and method |
| CN107728110B (en) * | 2017-09-20 | 2020-10-23 | 电子科技大学 | Shared signal design method based on LFM signal phase modulation |
| CN108471321B (en) * | 2018-03-19 | 2020-04-03 | 北京大学 | Method for constructing radar-communication integrated system for simultaneous co-frequency transmission of communication data and radar performance parameters |
| CN108957412A (en) * | 2018-07-12 | 2018-12-07 | 西安电子科技大学 | Radar detection and method for communication transmission based on piece-wise linear FM signal |
| CN109507661B (en) * | 2018-09-28 | 2023-04-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Radar and communication integrated signal processing method |
| CN113098810B (en) * | 2021-03-31 | 2022-02-18 | 华中科技大学 | Time-frequency joint synchronization method and device of LFM-MPSK radar communication integrated system |
| CN114325589B (en) * | 2021-12-25 | 2024-08-30 | 北京神星科技有限公司 | FMCW radar device with random parameters and signal generation and processing method |
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