CN108459326A - Terahertz radar transmit-receive system and single-shot receive Terahertz coherent radar more - Google Patents
Terahertz radar transmit-receive system and single-shot receive Terahertz coherent radar more Download PDFInfo
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- CN108459326A CN108459326A CN201710090334.6A CN201710090334A CN108459326A CN 108459326 A CN108459326 A CN 108459326A CN 201710090334 A CN201710090334 A CN 201710090334A CN 108459326 A CN108459326 A CN 108459326A
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
Abstract
A kind of Terahertz radar transmit-receive system of offer of the embodiment of the present invention and Terahertz radar, the Terahertz radar transmit-receive system include：Single-frequency continuous wave source group, including multiple single-frequency continuous wave sources for being suitable for generating single-frequency continuous wave local oscillation signal；Linear FM signal generation unit is suitable for receiving frequency-sweeping control signal and controls signal generate line CW with frequency modulation signal according to frequency sweep；It is connected to the upconverting unit of single-frequency continuous wave source group and linear FM signal generation unit, Terahertz radar emission signal is generated suitable for being based in linear frequency modulation continuous wave signal and single-frequency continuous wave source group single-frequency continuous wave local oscillation signal caused by the first single-frequency continuous wave source, is suitable for generating level-one down coversion local oscillation signal based on single-frequency continuous wave local oscillation signal caused by the second single-frequency continuous wave source in linear frequency modulation continuous wave signal and single-frequency continuous wave source group.Thus the working performance of Terahertz radar is improved.
Description
Technical field
The present invention relates to Terahertz Radar Technology fields, and in particular, to a kind of Terahertz radar transmit-receive system, Terahertz
Radar and single-shot receive Terahertz radar more.
Background technology
THz wave (Terahertz, THz) refers to electromagnetic wave of the frequency within the scope of 0.1~10THz, between infrared and
It is a kind of novel electromagnetic radiation between microwave band.In recent years, with the breakthrough of THz source and related component, too
A series of unique advantages such as Hertz wave is radiationless safely, penetrability is strong, strong antijamming capability, resolution ratio height radar detection,
The fields such as remote sensing, safety detection, biological information extraction and medical diagnosis are sent to great expectations, it has also become domestic and international research hotspot.
It, at present can be by submillimeter wave frequency modulated continuous wave radar technology for the low end frequency electromagnetic wave of Terahertz frequency spectrum
It generates, such as document " Cooper K B, Dengler R J, Llombart N, et al.THz Imaging Radar for
Standoff Personnel Screening[J].IEEE Transactions on Terahertz Science&
Technology,2011,1(1):169-182. " reports a kind of frequency and receives CW with frequency modulation too up to the single-shot list of 675GHz
Hertz radar system, is imaged for human body three-dimensional.
But, on the one hand, since current most of Terahertz radar both at home and abroad is all made of the transmitting-receiving system of single-shot list receipts
System design, and single Terahertz frequency source output power is relatively low, and Terahertz radar is caused to be used in its frequency source output radiofrequency signal
In the case of transmitting, the signal separated by Terahertz frequency source institute work(cannot be satisfied the drive in receiving channel needed for local oscillation signal
Dynamic voltage, has seriously affected the working performance of Terahertz radar；On the other hand, the Terahertz radar applied on the market at present by
In lacking phase signal control, lead to not to be well controllled the continuity of the terahertz signal of Terahertz radar transmitting and same
Step property, can similarly influence the working performance of Terahertz radar.
Invention content
In view of this, the present invention is directed to propose a kind of Terahertz radar transmit-receive system, can at least solve in background technology
The Terahertz frequency source output power illustrated is too low, and Terahertz thunder can not be ensured in the case where meeting terahertz signal transmitting
Up to the continuity of the terahertz signal of driving voltage and the transmitting of Terahertz radar needed for local oscillation signal in receiving channel and same
Step property it is uncontrollable and cause Terahertz radar working performance reduce the technical issues of.
To achieve the goals above, the embodiment of the present invention provides a kind of Terahertz radar transmit-receive system, which includes：It is single
The continuous wave source group of frequency, including multiple single-frequency continuous wave sources for being suitable for generating single-frequency continuous wave local oscillation signal；Linear FM signal is given birth to
At unit, it is suitable for receiving frequency-sweeping control signal and signal generate line CW with frequency modulation signal is controlled according to the frequency sweep；Signal
Phase locking unit is connected to the linear FM signal generation unit and single-frequency continuous wave source group, is suitable for output reference frequency
Signal is to the linear FM signal generation unit and single-frequency continuous wave source group with to the single-frequency continuous wave local oscillation signal
Locking phase is executed with the linear frequency modulation continuous wave signal；And upconverting unit, it is connected to single-frequency continuous wave source group and institute
Linear FM signal generation unit is stated, it is continuous to be suitable for the single-frequency based on the linear frequency modulation continuous wave signal and the multi-frequency
Wave local oscillation signal generates Terahertz radar emission signal.
Through the above technical solutions, one aspect of the present invention respectively drives hair by using multiple and different single-frequency continuous wave sources
Penetrate the local oscillation signal in signal and receiving channel so that radar can also be ensured while meeting the transmission power of Terahertz radar
The required driving voltage of local oscillation signal under receiving channel solves the Terahertz frequency source under the present art because of output work
Rate is relatively low and can not meet the problem of transmitting and reception simultaneously by work(point；On the other hand, it is given birth to by using linear FM signal
The continuity and synchronism that control radar emits signal are realized at unit matching signal locking unit.
It should be pointed out that the other feature and advantage of the embodiment of the present invention will give in subsequent specific embodiment part
To be described in detail.
Description of the drawings
Attached drawing is further understood to the embodiment of the present invention for providing, an and part for constitution instruction, under
The specific implementation mode in face is used to explain the embodiment of the present invention together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure：
Fig. 1 shows the structural schematic diagram of the Terahertz radar transmit-receive system of one embodiment of the invention；
Fig. 2 shows be another embodiment of the present invention Terahertz radar transmit-receive system structural schematic diagram；
Fig. 3 shows the single-emission and double-receiving CW with frequency modulation Terahertz coherent radar receive-transmit system of further embodiment of this invention
Structural schematic diagram；
Fig. 4 shows the detailed knot of single-emission and double-receiving CW with frequency modulation Terahertz coherent radar receive-transmit system shown in Fig. 3
Structure schematic diagram.
Reference sign
101 single-frequency continuous wave source group of 10-30 Terahertz radar transmit-receives system
102 linear FM signal generation unit, 103 signal locking unit
104 upconverting units 1011,1012 single-frequency continuous wave sources
105 beat local oscillation signal generation unit, 106 down-converter unit
107 radar receiving unit, 1031 signal generator
1032 first intermediate frequency power splitter, 1021 arbitrary waveform generator
21,22,23 31,32,33 RF Power Splitters of frequency source
1041 second intermediate frequency power splitter, 41,42,43 up-conversion mixer
51,52,53 radio frequency band filter, 61,62,63 radio frequency amplifies frequency multiplier circuit
71,72 beat frequency mixers 81,82 intermediate frequencies amplify frequency multiplier circuit
10611-10614 down-conversion mixers 10621,10622 if bandpas filters
10631,10632 IF amplifier circuit 10641-10644 low-pass filters
Specific implementation mode
The specific implementation mode of the embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this
The described specific implementation mode in place is merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
It should be noted that in attached drawing or specification description, similar or identical part all uses identical figure number.It is attached
The realization method for not being painted or describing in figure is form known to a person of ordinary skill in the art in technical field.In addition, though this
Text can provide the demonstration of the parameter comprising particular value, it is to be understood that parameter is equal to corresponding value without definite, but can connect
The error margin received is similar to be worth accordingly in design constraint.
Embodiment one
The structural schematic diagram of the Terahertz radar transmit-receive system of one embodiment of the invention, the terahertz are shown referring to Fig. 1
Hereby radar transmit-receive system 10 includes single-frequency continuous wave source group 101, linear FM signal generation unit 102 and single-frequency continuous wave source
The signal locking unit 103 and upconverting unit 104 that group 101 and linear FM signal generation unit 102 connect；More specifically,
Include multiple single-frequency continuous wave sources such as 1011,1012 in single-frequency continuous wave source group 101, each single-frequency continuous wave source is fitted
In the single-frequency continuous wave local oscillation signal for generating certain frequency, Gu Danpinlianxuboyuan groups 101 are suitable for generating one group of multiple single-frequency and connect
Continuous wave local oscillation signal, the present embodiment is not limited the quantity in the single-frequency continuous wave source in wave source group at this, equally also to this
Relationship between the frequency range of local oscillation signal caused by multiple single-frequency continuous wave sources 1011 in single-frequency continuous wave source group 101
(such as equal or unequal) is not limited.The linear FM signal generation unit 102 is suitable for receiving frequency-sweeping control signal simultaneously
Signal generate line CW with frequency modulation signal is controlled according to the frequency sweep, thus controls and ensure the continuity of radar emission signal；
The signal locking unit 103 is suitable for output reference frequency signal to linear FM signal generation unit 102 and single-frequency continuous wave source
Thus group 101 has ensured the radar to execute locking phase to the single-frequency continuous wave local oscillation signal and the linear frequency modulation continuous wave signal
The synchronism of all signals in receive-transmit system 10；The upconverting unit 104 is suitable for being based on linear frequency modulation continuous wave signal and single-frequency
Single-frequency continuous wave local oscillation signal generation terahertz caused by one of continuous wave source group 101 time or multiple single-frequency continuous wave sources
Hereby radar emission signal is for radar emission, and is suitable for being based on linear frequency modulation continuous wave signal and single-frequency continuous wave source group
Single-frequency continuous wave local oscillation signal generates level-one down coversion sheet caused by others one or more single-frequency continuous waves source under 101
Shake signal；As a result, the single-frequency continuous wave source of the part (one or more) under the group of single-frequency continuous wave source is single as first
The continuous wave source subgroup of frequency is used for radar emission, and the single-frequency continuous wave source of another part (other one or more) is single as second
The continuous wave source subgroup of frequency is used to generate the down coversion local oscillation signal suitable for analyzing radar receives echo-signal so that Terahertz wave source
It is being only used for emitting or providing down coversion local oscillation signal source, it is to be understood that the first or second single-frequency continuous wave source subgroup
Included in single-frequency continuous wave source quantity it is either one or more, the embodiment of the present invention is not limited thereto；
Thus solve in the prior art due to single THz wave source power it is low realize emit signal while under can not ensure work(
The technical barrier of the reliability of the down coversion local oscillation signal separated.
It is understood that being the preferred embodiment of the present invention in the embodiment one, to be become apparent from specifically as example
Technical solution of the present invention is explained on ground, and can not be used as limiting the scope of the present invention.One or more in the embodiment
A technical characteristic reconfigures the simple deformation that should also be as regarding as technical solution of the present invention, it should also cover the present invention's
Among protection domain.The problem of due to length, not in this to go forth.
Embodiment two
Embodiment two can be regarded as a kind of preferred embodiment of embodiment one, because disclosing only this in embodiment one
Subproblem of the Terahertz radar in terms of signal transmitting, and do not have in terms of signal reception and optimization processing mentioned.It is practical
On, the present inventor also found in the practice of the invention extends Terahertz in the range of system complexity and cost permission
The transceiver channel number and degree of freedom of radar help to increase radar in the degree of freedom in space, polarization etc., promote radar work
Make performance；And it is gone respectively as transmiting signal source and driving receiving channel using multiple and different frequency sources in embodiment one
Local oscillation signal source design as with existing signal receiving channel processing scheme, then can bring transmitting, receiving phase not
It is synchronous, the problem of radar system non-coherent.For this purpose, the present invention also continues to disclose a kind of more receiving channel tune of embodiment two herein
Frequency continuous wave Terahertz coherent radar receive-transmit system specifically discloses and is directed to radar echo signal after receiving terahertz signal
Processing scheme.
It is compared to Fig. 1, Terahertz radar transmit-receive system 20, which adds, shown in embodiment as shown in Figure 2 is connected to this
The beat local oscillation signal generation unit 105 of single-frequency continuous wave source group 101；Be connected to 105 He of beat local oscillation signal generation unit
The down-converter unit 106 of upconverting unit 104, about in embodiment shown in Fig. 2 part-structure and part operation principle can
With the associated description with reference to embodiment one, therefore not in this to go forth for identical content；It is further thin as described in Example 1
Change, upconverting unit 104 is further adapted for exporting P according to linear frequency modulation continuous wave signal and the single-frequency continuous wave local oscillation signal of the multichannel
For road level-one down coversion local oscillation signal to down-converter unit 106, P is the natural number more than 1.At the same time, beat local oscillation signal is given birth to
It is suitable for exporting the two level down coversion local oscillation signal on P roads to lower change according to the single-frequency continuous wave local oscillation signal of the multichannel at unit 105
Frequency unit 106, the two level down coversion local oscillation signal can at least reflect that first single-frequency of the radar signal for transmitting is continuous
Pair between the second frequency of the first frequency of single-frequency continuous wave caused by wave source subgroup and level-one down coversion local oscillation signal
It should be related to；The way of the local oscillation signal can be corresponding with the receiving path of the Terahertz radar, i.e., as shown in Fig. 2, being configured with P
For a radar receiving antenna to receive the radar receiving unit 107 of the radar echo signal on the roads P, the quantity of certain antenna is that P exists
This is only used as example not have to be construed as limiting protection scope of the present invention；Then, down-converter unit 106 is suitable for the level-one using the roads P
The thunder on the roads P received by down coversion local oscillation signal and the two level down coversion local oscillation signal frequency modulated(FM) radar receiving unit 107 on the roads P
Up to echo-signal.
While the embodiment of the present invention two has all advantageous effects of embodiment one, additionally it is possible to continuous using different single-frequency
The Beat Signal of wave source is as two level down coversion local oscillation signal, thus together with level-one down coversion local oscillation signal and two level down coversion sheet
The signal that shakes executes the frequency modulation of the radar echo signal received to Terahertz radar, ensure that single-shot receives Terahertz radar transmit-receive more
The signal coherent pulse signalf of system can effectively improve the accuracy of radar monitoring.
Embodiment three
In order to make technical scheme of the present invention preferably be understood by the public, the present invention continue herein open embodiment three with
The more specific structure of Terahertz radar transmit-receive system provided by the present invention and operation principle are illustrated, the embodiment of the present invention
Three can be regarded as the more detailed illustration and description of embodiment one and embodiment two.
As shown in figure 3, the embodiment of the present invention be disclosed it is a kind of three by using under single-frequency continuous wave source group 101 not
The receive-transmit system of the single-emission and double-receiving CW with frequency modulation Terahertz coherent radar in same single-frequency continuous wave source, thus solves existing skill
In art single Terahertz frequency source due to output power is relatively low can not by work(point and meanwhile meet transmitting, multipath reception is asked
Topic, while two level down coversion also is carried out using the frequency-doubled signal of different single-frequency continuous wave sources Beat Signal, to ensure that single-shot
Double coherents for receiving CW with frequency modulation Terahertz radar transmit-receive system.
Fig. 3 shows the structure of single-emission and double-receiving CW with frequency modulation Terahertz coherent radar receive-transmit system of the embodiment of the present invention
Schematic diagram.Receive-transmit system with continued reference to Fig. 3, the single-emission and double-receiving CW with frequency modulation Terahertz coherent radar includes：Signal locking
Unit 103 is input to the frequency of linear FM signal generation unit 102 and single-frequency continuous wave source group 101 as 10MHz for generating
Reference frequency signal, so that the signal and the reference frequency signal locking phase of the output of all signal sources；Linear FM signal is given birth to
At unit 102, for controlling signal according to the frequency sweep received, the linear frequency modulation that generation is input to upconverting unit 104 is continuous
Wave intermediate-freuqncy signal；Single-frequency continuous wave source group 101, for generating the three road single-frequency continuous wave local oscillators for being input to upconverting unit 104
Signal, the three roads signal are input to beat local oscillation signal generation unit 105 respectively after work(point and are used as radio frequency and local oscillator simultaneously
Signal inputs；Upconverting unit 104, the linear frequency modulation for being exported according to the linear FM signal generation unit 102 received
The three road single-frequency continuous wave local oscillation signals that continuous wave intermediate-freuqncy signal and single-frequency continuous wave source group 101 export generate transmitting Terahertz
Signal and two-way are input to the level-one down coversion local oscillation signal of down-converter unit 106；Beat local oscillation signal generation unit 105 is used
In the three road single-frequency continuous wave signals exported according to the single-frequency continuous wave source group 101 received, generates two-way and be input to down coversion
The two level down coversion local oscillation signal of unit 106；Down-converter unit 106, for what is exported according to the upconverting unit 104 received
Two-way level-one down coversion local oscillation signal carries out level-one down coversion mixing respectively to the two-way Terahertz echo-signal received, and
And the two-way two level down coversion local oscillation signal exported according to the beat local oscillation signal generation unit 105 received, to becoming under level-one
Two-way intermediate-freuqncy signal after frequency carries out two level down coversion quadrature demodulation respectively, exports the same phase point of the zero intermediate frequency of two-way receiving channel
Signal (i.e. the I component on the roads R × A and the roads R × B) and orthogonal component signal (i.e. the Q component on the roads R × A and the roads R × B) are measured, as schemed institute
Show that the roads R × A and the roads R × B refer to the different radar echo signal of two-way.
Fig. 4 shows the detailed knot of single-emission and double-receiving CW with frequency modulation Terahertz coherent radar receive-transmit system shown in Fig. 3
Structure schematic diagram.As shown in figure 4, signal locking unit 103 is made of signal generator 1031 and the first intermediate frequency power splitter 1032, it should
Signal generator 1031 is suitable for generating the reference frequency signal that frequency is 10MHz；Linear FM signal generation unit 102 can be by
The arbitrary waveform generator 1021 of direct digital synthesizers type is constituted, and reception includes frequency sweep centre frequency f0, signal amplitude A, letter
Number bandwidth B, scan period T and start frequency sweep, the frequency sweep that terminates frequency sweep controls signal, generate frequency range f0- B/2~f0+B/
2 linear frequency modulation continuous wave signal s (t), the signal meet
Wherein, t is indicated using the second as the time of dimension, and rect (t) indicates that width is 1 rectangular window function, and N is indicated from the beginning of
Number of the frequency sweep to the scan period for terminating to be included during frequency sweep.The then linear frequency modulation continuous wave signal of some scan period
Meet
Wherein, t ' expressions start the time at frequency sweep moment relative to the scan period, and the present invention presented below is implemented
Example in each signal form time using the scan period start the frequency sweep moment be timeorigin refer to, and each module input and
The transformation of output signal type is demonstration with the signal of a scan period；
Single-frequency continuous wave source group 101 includes first frequency source 21, second point frequency source 22, thirdly frequency source 23, the first radio frequency
Power splitter 31, the second RF Power Splitter 32, third RF Power Splitter 33；
Wherein, first frequency source 21 is f for generating frequency1Single-frequency continuous wave signal and through therewith sequentially connected
After one RF Power Splitter, 31 work(point list is generated respectively as the input of the first via local oscillator of upconverting unit 104 and beat local oscillation signal
The radio frequency input of member 105, signal form meet
Wherein, A1For signal amplitude,For the initial phase of first frequency source 21；
Second point frequency source 22 is f for generating frequency2And f2≠f1Single-frequency continuous wave signal and through sequentially connected therewith
It is generated respectively as the second tunnel local oscillator input of upconverting unit 104 and beat local oscillation signal after second RF Power Splitter, 32 work(point
The first via local oscillator of unit 105 inputs, and signal form meets
Wherein, signal amplitude A1It is consistent with the signal amplitude of formula (3),For the initial phase of second point frequency source 23；
Thirdly frequency source 23 is f for generating frequency2And f2≠f1Single-frequency continuous wave signal and through sequentially connected therewith
It is generated respectively as the third road local oscillator input of upconverting unit 104 and beat local oscillation signal after 33 work(of third RF Power Splitter point
Second tunnel local oscillator input of unit 105, signal form meet
Wherein, signal amplitude A1It is consistent with the signal amplitude of formula (3),For the initial phase of thirdly frequency source 23；
Upconverting unit 104 includes the second intermediate frequency power splitter 1041, the first up-conversion mixer 41, the mixing of the second up-conversion
Device 42, third up-conversion mixer 43, the first radio frequency band filter 51, the second radio frequency band filter 52, third radio frequency band
Bandpass filter 53, the first radio frequency amplification frequency multiplier circuit 61, the second radio frequency amplification frequency multiplier circuit 62, third radio frequency amplify frequency multiplier circuit
63；
Wherein, the second intermediate frequency power splitter 1041 will be being generated and be input to upper change by linear FM signal generation unit 102
The frequency range of frequency unit 104 is f0- B/2~f0Linear frequency modulation continuous wave intermediate-freuqncy signal s (t) work(of+B/2 is divided into three road signals,
Respectively as the intermediate frequency input of the first up-conversion mixer 41, the second up-conversion mixer 42 and third up-conversion mixer 43；
First up-conversion mixer 41 and the first radio frequency band filter 51, the first radio frequency amplification frequency multiplier circuit 61 connect successively
It connects, frequency that is being generated according to single-frequency continuous wave source group 101 and being input to upconverting unit 14 is f1The first via local oscillator input,
To the second intermediate frequency power splitter 1041 output first via intermediate-freuqncy signal execute up-conversion mixing, then pass through radio frequency bandpass filtering,
After amplification and frequency multiplication, generation frequency range is (f1+f0- B/2) × M~(f1+f0+ B/2) × M transmitting terahertz signal, letter
Number form meets
Wherein, A2For signal amplitude, M is the frequency multiplication multiple that the first radio frequency amplifies frequency multiplier circuit 61；
Second up-conversion mixer 42 and the second radio frequency band filter 52, the second radio frequency amplification frequency multiplier circuit 62 connect successively
It connects, generated according to single-frequency continuous wave source group 101, be input to upconverting unit 104, frequency f2First via local oscillator it is defeated
Enter, the second tunnel intermediate-freuqncy signal s that the second intermediate frequency power splitter 1041 is exported2(t) up-conversion mixing is carried out, radio frequency band is then passed through
After pass filter, amplification and frequency multiplication, generation frequency range is (f2+f0- B/2) × M~(f2+f0+ B/2) × M terahertz signal,
As the first via level-one down coversion local oscillation signal for being input to down-converter unit 106, signal form meets
Wherein, A3For signal amplitude, M is the frequency multiplication multiple that the second radio frequency amplifies frequency multiplier circuit 62, is put with the first radio frequency
The frequency multiplication multiple of big frequency multiplier circuit 61 is equal；
Third up-conversion mixer 43 and third radio frequency band filter 53, third radio frequency amplification frequency multiplier circuit 63 connect successively
It connects, frequency being generated according to single-frequency continuous wave source group 101, being input to upconverting unit 104 is f1The second tunnel local oscillator input,
The third road intermediate-freuqncy signal s that second intermediate frequency power splitter 1041 is exported3(t) up-conversion mixing is carried out, radio frequency band logical is then passed through
After filtering, amplification and frequency multiplication, generation frequency range is (f2+f0- B/2) × M~(f2+f0+ B/2) × M terahertz signal, make
To be input to the second tunnel level-one down coversion local oscillation signal of down-converter unit 106, signal form meets
Wherein, signal amplitude A3Consistent with formula (7) signal amplitude, M is the frequency multiplication times that third radio frequency amplifies frequency multiplier circuit 63
Number is equal with the first radio frequency amplification frequency multiplication multiple of frequency multiplier circuit 61；
Beat local oscillation signal generation unit 105 includes the first beat frequency mixer 71, the second beat frequency mixer 72, the first intermediate frequency
Amplify frequency multiplier circuit 81, the second intermediate frequency amplifies frequency multiplier circuit 82；
First beat frequency mixer 71 and the first intermediate frequency amplification frequency multiplier circuit 72 are sequentially connected, continuous according to the single-frequency received
The frequency that wave source group 101 generates is f1Single-frequency continuous wave radio frequency input and frequency be f2The first via local oscillator input, pass through mixing
Generation frequency is f2-f1Beat Signal, through intermediate frequency amplification frequency multiplier circuit execute intermediate frequency amplification and frequency multiplication after generate frequency be (f2-
f1The intermediate-freuqncy signal of) × M, as the first via two level down coversion local oscillation signal for being input to down-converter unit 106, signal form is full
Foot
Wherein, A4For signal amplitude, M is the frequency multiplication multiple that the first intermediate frequency amplifies frequency multiplier circuit 81, is put with the first radio frequency
The frequency multiplication multiple of big frequency multiplier circuit 61 is equal；
Second beat frequency mixer 72 and the second intermediate frequency amplification frequency multiplier circuit 82 are sequentially connected, continuous according to the single-frequency received
The frequency that wave source group 101 generates is f1Single-frequency continuous wave radio frequency input and frequency be f2The second tunnel local oscillator input, pass through mixing
Generation frequency is f2-f1Beat Signal, through intermediate frequency amplification and frequency multiplication after generate frequency be (f2-f1The intermediate-freuqncy signal of) × M is made
To be input to the second tunnel two level down coversion local oscillation signal of down-converter unit 106, signal form meets
Wherein, signal amplitude A4Consistent with formula (9) signal amplitude, M is the frequency multiplication times that the second intermediate frequency amplifies frequency multiplier circuit 82
Number is equal with the first radio frequency amplification frequency multiplication multiple of frequency multiplier circuit 61；
Down-converter unit 106 include the first level-one down-conversion mixer 10611, the second level-one down-conversion mixer 10612,
In first if bandpas filter 10621, the second if bandpas filter 10622, the first IF amplifier circuit 10631, second
Frequency amplifying circuit 10632, the first two level down-conversion mixer 10613, the second two level down-conversion mixer 10614, the first low pass
Filter 10641, the second low-pass filter 10642, third low-pass filter 10643, the 4th low-pass filter 10644；
The reception of the receive-transmit system of single-emission and double-receiving CW with frequency modulation Terahertz coherent radar of the embodiment of the present invention as shown in Figure 4
Channel number is two, is receiving channel RxA and receiving channel RxB respectively, is respectively connected to reception antenna RxA and reception antenna
RxB；
If the target for being launched THz wave irradiation is represented by the set of K point target, relative to reception antenna RxA,
Object function is expressed as
Wherein, σk,AAnd ψk,ALower k-th mesh of observation geometry constituted with transmitting antenna and reception antenna RxA is indicated respectively
Target Radar Cross Section and target phase, τk,AIt is irradiated to k-th of point target from transmitting antenna for THz wave, then by kth
To the round trip time delay of reception antenna RxA, δ (t ') indicates dirac impulse function, then receiving channel RxA for a point target back scattering
The Terahertz echo-signal through K point target back scattering received is expressed as
Wherein, A5For echo signal amplitude,
First level-one down-conversion mixer 10611, the first if bandpas filter 10621, the first IF amplifier circuit
10631, the first two level down-conversion mixer 10613 is sequentially connected, the frequency model generated according to the upconverting unit 104 received
It encloses for (f2+f0- B/2) × M~(f2+f0+ B/2) × M first via level-one down coversion local oscillation signal (formula (7) shown in), by formula
(12) the receiving channel RxA Terahertz echo-signals received shown in carry out level-one down coversion mixing, the signal warp after mixing
After intermediate frequency bandpass filtering and amplification, intermediate-freuqncy signal is obtained, form is
Wherein, A6For intermediate-freuqncy signal amplitude, to above-mentioned intermediate-freuqncy signal, according to the beat local oscillation signal generation unit received
105 is generating, frequency is (f2-f1The first via two level down coversion local oscillation signal (shown in formula (9)) of) × M, carries out two level down coversion
Quadrature demodulation, output two paths of signals carry out low pass filtered through the first low-pass filter 10641 and the second low-pass filter 10642 respectively
After wave, the zero intermediate frequency in-phase component signal I as receiving channel RxAAWith orthogonal component signal QA, signal form is：
Wherein, A7For zero intermediate frequency signals amplitude；
For receiving channel RxB, if the object function of K point target is expressed as
Wherein, σk,BAnd ψk,BLower k-th mesh of observation geometry constituted with transmitting antenna and reception antenna RxB is indicated respectively
Target Radar Cross Section and target phase, τk,BIt is irradiated to k-th of point target from transmitting antenna for THz wave, then by kth
To the round trip time delay of reception antenna RxB, δ (t ') indicates dirac impulse function, then receiving channel RxB for a point target back scattering
The Terahertz echo-signal through K point target back scattering received is expressed as
Wherein, A5' it is echo signal amplitude,
Second level-one down-conversion mixer 10612, the second if bandpas filter 10622, the second IF amplifier circuit
10632, the second two level down-conversion mixer 10614 is sequentially connected, generated according to the upconverting unit 104 received, frequency
Ranging from (f2+f0- B/2) × M~(f2+f0+ B/2) × M the second tunnel level-one down coversion local oscillation signal (formula (8) shown in), by formula
(16) the receiving channel RxB Terahertz echo-signals received shown in carry out level-one down coversion mixing, the signal warp after mixing
After intermediate frequency bandpass filtering and amplification, intermediate-freuqncy signal is obtained, form is
Wherein, A6' it is intermediate-freuqncy signal amplitude, to above-mentioned intermediate-freuqncy signal, generated according to the beat local oscillation signal received single
Member 105 generates, frequency is (f2-f1The second tunnel two level down coversion local oscillation signal (shown in formula (10)) of) × M, carries out under two level
Frequency conversion quadrature demodulation, output two paths of signals carry out through third low-pass filter 10643 and the 4th low-pass filter 10644 low respectively
After pass filter, the zero intermediate frequency in-phase component signal I as receiving channel RxBBWith orthogonal component signal QB, signal form is：
Wherein, A7For the identical zero intermediate frequency signals amplitude with formula (14).
To sum up, the embodiment of the present invention respectively drives transmitting signal, two-way by using three different single-frequency continuous wave sources
The level-one down coversion local oscillation signal of receiving channel generates, solve the Terahertz frequency source of the present art because output power compared with
It is low and can not be by work(point while the problem of meet transmitting, multipath reception；Believe further through by the beat in three single-frequency continuous wave sources
Number through amplification, the two level down coversion local oscillation signal after frequency multiplication as two-way receiving channel, solve because of three single-frequency continuous wave sources
The non-coherent problem of system caused by difference, to realize single-emission and double-receiving CW with frequency modulation Terahertz coherent radar transmitting-receiving
System increases the degree of freedom in Terahertz radar transmit-receive channel.
On the other hand the embodiment of the present invention also provides a kind of Terahertz coherent radar receipts illustrated comprising above-described embodiment
The Terahertz radar of hair system so that the Terahertz radar can have above-mentioned Terahertz coherent radar receive-transmit system structure and
Corresponding advantageous effect；The Terahertz radar is preferably the Terahertz radar transmit-receive illustrated comprising embodiment two or three as a result,
The coherent Terahertz radar of receipts type more than the single-shot of system structure.
The optional embodiment of example of the present invention, still, the embodiment of the present invention and unlimited are described in detail above in association with attached drawing
Detail in the above embodiment can be to the embodiment of the present invention in the range of the technology design of the embodiment of the present invention
Technical solution carry out a variety of simple variants, these simple variants belong to the protection domain of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the embodiment of the present invention pair
Various combinations of possible ways no longer separately illustrate.
In addition, arbitrary combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, disclosure of that of the embodiment of the present invention is equally should be considered as.
Claims (13)
1. a kind of Terahertz radar transmit-receive system, which is characterized in that the system includes：
Single-frequency continuous wave source group, including multiple single-frequency continuous wave sources for being suitable for generating single-frequency continuous wave local oscillation signal；
Linear FM signal generation unit is suitable for receiving frequency-sweeping control signal and controls signal generate line tune according to the frequency sweep
Frequency continuous wave signal；
Signal locking unit is connected to the linear FM signal generation unit and single-frequency continuous wave source group, is suitable for output
Reference frequency signal is to the linear FM signal generation unit and single-frequency continuous wave source group with to the single-frequency continuous wave
Local oscillation signal and the linear frequency modulation continuous wave signal execute locking phase；
Upconverting unit is connected to single-frequency continuous wave source group and the linear FM signal generation unit, is suitable for being based on institute
Single-frequency caused by the first single-frequency continuous wave source subgroup in linear frequency modulation continuous wave signal and single-frequency continuous wave source group is stated to connect
Continuous wave local oscillation signal generates Terahertz radar emission signal, is suitable for connecting based on the linear frequency modulation continuous wave signal and the single-frequency
Single-frequency continuous wave local oscillation signal caused by the second single-frequency continuous wave source subgroup generates level-one down coversion local oscillator letter in continuous wave source group
Number.
2. Terahertz radar transmit-receive system according to claim 1, which is characterized in that the system further includes：
Beat local oscillation signal generation unit is connected to single-frequency continuous wave source group；
Down-converter unit is connected to the beat local oscillation signal generation unit and the upconverting unit；And
Radar receiving unit is connected to the down-converter unit, believes to receive the radar return on the roads P configured with reception antenna
Number,
Wherein, the upconverting unit is further adapted for the single-frequency continuous wave according to the linear frequency modulation continuous wave signal and the multichannel
Local oscillation signal exports P road level-one down coversion local oscillation signals to the down-converter unit, and P is the natural number more than 1；And
The beat local oscillation signal generation unit is suitable for according to received from first single-frequency continuous wave source subgroup and described second
The two level down coversion local oscillation signal on the single-frequency continuous wave local oscillation signal output P roads of the multi-frequency of single-frequency continuous wave source subgroup is to institute
State down-converter unit；
The wherein described down-converter unit is suitable for becoming using under the level-one down coversion local oscillation signal on the roads P and the two level on the roads P
The radar echo signal on the roads P received by radar receiving unit described in frequency local oscillation signal frequency modulation.
3. Terahertz radar transmit-receive system according to claim 2, which is characterized in that the down-converter unit includes lower change
Frequency frequency mixing module, is used for：
The roads the P radar received is returned according to the roads the P level-one down coversion local oscillation signal exported received from the upconverting unit
Wave signal executes the mixing of level-one down coversion respectively；
According to the roads the P two level down coversion local oscillation signal exported received from the beat local oscillation signal generation unit, to completing institute
It states the roads the P signal after executing the mixing of level-one down coversion and executes the quadrature demodulation of two level down coversion respectively to export the same of the roads P zero intermediate frequency
Branch signal and orthogonal component signal.
4. Terahertz radar transmit-receive system according to claim 1, which is characterized in that the down-converter unit also includes to connect
It is connected to the low-pass filtering module of the down coversion frequency mixing module.
5. Terahertz radar transmit-receive system according to claim 1, which is characterized in that the signal locking unit includes：
Signal generator for generating the reference frequency signal, and
For being exported the reference frequency signal respectively to the linear FM signal generation unit and the single-frequency continuous wave
First power splitter of source group.
6. Terahertz radar transmit-receive system according to claim 5, which is characterized in that the frequency of the reference frequency signal
It is intermediate frequency power splitter for 10MHz and first power splitter.
7. Terahertz radar transmit-receive system according to claim 1, which is characterized in that the linear frequency modulation continuous wave signal
Waveform s (t) meets：
Wherein, f0, A, B, T corresponding frequency for indicating frequency sweep control signal, amplitude, bandwidth, period respectively, t is indicated using the second as dimension
Time, rect (t) indicate width be 1 rectangular window function, N indicate frequency sweep control signal from initially receive stop receive
The number for the scan period for being included during frequency sweep.
8. Terahertz radar transmit-receive system according to claim 2, which is characterized in that P values are 2, and the single-frequency is continuous
Wave source group is suitable for generating the single-frequency continuous wave local oscillation signal of two kinds of frequencies, and
Single-frequency continuous wave source group includes first frequency source, second point frequency source, thirdly frequency source, and is connected to described first
First RF Power Splitter of point frequency source, the second RF Power Splitter for being connected to the second point frequency source, be connected to it is described thirdly
The third RF Power Splitter of frequency source,
Wherein, first frequency source is for generating the single-frequency continuous wave signal of first frequency and through first RF Power Splitter
Radio frequency after work(point respectively as the input of the first via local oscillator of upconverting unit and beat local oscillation signal generation unit inputs；
The second point frequency source is used to generate the single-frequency continuous wave signal of second frequency and through the second RF Power Splitter work(point
It is defeated respectively as the first via local oscillator of the second tunnel local oscillator input of upconverting unit and the beat local oscillation signal generation unit afterwards
Enter；
The thirdly frequency source is for generating the single-frequency continuous wave signal of the second frequency and through the third RF Power Splitter
Respectively as the second tunnel local oscillator of upconverting unit third road local oscillator input and the beat local oscillation signal generation unit after work(point
Input.
9. Terahertz radar transmit-receive system according to claim 8, which is characterized in that the upconverting unit includes second
Intermediate frequency power splitter, the first up-conversion mixer, the second up-conversion mixer, third up-conversion mixer, the first radio frequency times magnification
Frequency circuit, the second radio frequency amplification frequency multiplier circuit, third radio frequency amplify frequency multiplier circuit；
Wherein, linear frequency modulation continuous wave intermediate-freuqncy signal work(is divided into first via intermediate-freuqncy signal and is input to by the second intermediate frequency power splitter
First up-conversion mixer, the second tunnel intermediate-freuqncy signal are input to the second up-conversion mixer and third road intermediate-freuqncy signal is input to
Three up-conversion mixers；
First up-conversion mixer inputs according to the first via local oscillator first via intermediate-freuqncy signal carrying out up-conversion
It is mixed to generate the first mixed frequency signal,
The first radio frequency amplification frequency multiplier circuit amplifies frequency multiplier circuit based on first mixed frequency signal and first radio frequency
Frequency generates the terahertz signal of first frequency range using as the Terahertz radar emission signal；
Second up-conversion mixer inputs according to the first via local oscillator second tunnel intermediate-freuqncy signal carrying out up-conversion
It is mixed to generate the second mixed frequency signal,
The second radio frequency amplification frequency multiplier circuit amplifies frequency multiplier circuit based on second mixed frequency signal and second radio frequency
Frequency generates the terahertz signal of the first frequency range to be input to institute as first via level-one down coversion local oscillation signal
State down-converter unit；
The third up-conversion mixer inputs according to second tunnel local oscillator third road intermediate-freuqncy signal carrying out up-conversion
It is mixed to generate third mixed frequency signal,
The third radio frequency amplification frequency multiplier circuit amplifies frequency multiplier circuit based on the third mixed frequency signal and the third radio frequency
Frequency generates the terahertz signal of the first frequency range to be input to institute as the second tunnel level-one down coversion local oscillation signal
State down-converter unit.
10. Terahertz radar transmit-receive system according to claim 9, it is characterised in that：
The beat local oscillation signal generation unit includes the first beat frequency mixer, the second beat frequency mixer, and with described first
The second intermediate frequency times magnification that first intermediate frequency of beat frequency mixer connection amplifies frequency multiplier circuit, connect with the second beat frequency mixer
Frequency circuit；
The first beat frequency mixer is believed according to the single-frequency continuous wave radio frequency of first via local oscillator input and the first frequency
Number generate the first Beat Signal,
The first intermediate frequency amplification frequency multiplier circuit amplifies frequency multiplier circuit based on first Beat Signal and first intermediate frequency
Frequency generation first via two level down coversion local oscillation signal, which is used as, is input to the down-converter unit；
The second beat frequency mixer is believed according to the single-frequency continuous wave radio frequency of the input of second tunnel local oscillator and the first frequency
Number generate the second Beat Signal,
The second intermediate frequency amplification frequency multiplier circuit amplifies frequency multiplier circuit based on second Beat Signal and second intermediate frequency
The second tunnel of frequency generation two level down coversion local oscillation signal, which is used as, is input to the down-converter unit.
11. Terahertz radar transmit-receive system according to claim 10, it is characterised in that：
The first radio frequency amplification frequency multiplier circuit, second radio frequency amplification frequency multiplier circuit, third radio frequency amplification frequency multiplication electricity
Road, first intermediate frequency amplification frequency multiplier circuit, second intermediate frequency amplification frequency multiplier circuit and third intermediate frequency amplification frequency multiplication electricity
The frequency on road is equal.
12. a kind of Terahertz radar, which is characterized in that including claim 1-11 any one of them Terahertz radar transmit-receives system
System.
13. a kind of single-shot receives Terahertz coherent radar more, which is characterized in that described in any one of claim 2,3,8-11
Terahertz radar transmit-receive system.
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