CN103901404B - Be applicable to the MMAOP framework of Terahertz radar and communication system - Google Patents
Be applicable to the MMAOP framework of Terahertz radar and communication system Download PDFInfo
- Publication number
- CN103901404B CN103901404B CN201410094418.3A CN201410094418A CN103901404B CN 103901404 B CN103901404 B CN 103901404B CN 201410094418 A CN201410094418 A CN 201410094418A CN 103901404 B CN103901404 B CN 103901404B
- Authority
- CN
- China
- Prior art keywords
- terahertz
- signal
- frequency
- power
- framework
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/282—Transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The present invention relates to be applicable to the MMAOP framework of Terahertz radar and communication system, does it adopt synthetic (Array)+quasi-optical transmission (quasi-Optics)+parabola antenna (Parabolic of frequency multiplication (Multiplier)+mixing (Mixer)+array? antenna) implementation, obtain full-solid state high power terahertz emission source, can be applicable to Terahertz radar and communication system simultaneously; The receiving-transmitting chain of this framework is all realized by all solid state mode, favorable repeatability, and be convenient to integrated and miniaturization; This framework adopts the synthetic method of array manifold power to improve the power output of THz source, and extensibility is good, can first adopt little array, obtain medium power output, along with the progress of technology, strengthen gradually array quantity, improve the power output of single array element, thereby improve radiant power.
Description
Technical field
The present invention relates to Terahertz communication and Radar Technology in digital communication, specifically be applicable to the MMAOP framework of Terahertz radar and communication system, i.e. synthetic (Array)+quasi-optical transmission (quasi-Optics)+parabola antenna (Parabolicantenna) framework of frequency multiplication (Multiplier)+mixing (Mixer)+array.
Background technology
Terahertz communication and radar are the important applied field of THz wave. In Terahertz communication and radar system, require: 1. large bandwidth, to adapt to the requirement of high traffic rate and high radar resolution; 2. high EIRP(EffectiveIsotropicRadiatedPower, effective isotropic radiated power), far away to realize operating distance far away; 3. transmit-receive sharing, radar and communicate by letter general (a lot of occasions require the two to share a platform), form with simplification system; 4. adapt to radar and the more modulation standard of communicating by letter, as OOK(ASK), PSK, QAM, FM etc.; 5. all solid state realization of trying one's best, so that integrated and miniaturization. These requirements have proposed a lot of constraints to THz source, modulation /demodulation, power amplification, antenna, reception detection etc. There is contradiction during in realization with above-mentioned requirements in existing Terahertz radar and communication system architecture.
Existing several typical Terahertz radar and communication system architecture, as Figure 1-3, Fig. 1 is typical Terahertz radar system framework, its emitter adopts the structure of " IF Modulation+modulation signal frequency multiplication+solid state power amplifier+electrovacuum amplification+antenna ", receiving terminal goes tiltedly to process echo-signal is changed to intermediate frequency by frequency mixer, and this framework is generally only applicable to radar system; Fig. 2 had both been suitable for Terahertz radar, be suitable for again the system architecture of Terahertz communication, its emitter adopts the structure of " IF Modulation+frequency multiplication local vibration source+mixed modulated+solid state power amplifier+electrovacuum amplification+antenna ", receiving terminal is except replacing power amplifier with LNA, its framework and transmitting terminal are basic identical, and the transmitting-receiving of this framework separates. Fig. 3 is that dual-mode antenna shares Terahertz radar system framework.
The main difference of Fig. 1 and Fig. 2 is in the modulation system of intermediate-freuqncy signal. the modulated intermediate frequency signal of Fig. 1 is from the drive end feed-in of Terahertz frequency multiplier chain, nonlinear transformation through frequency multiplier chain forms radiofrequency signal, in the time that modulation signal is the linear frequency modulation intermediate-freuqncy signal of radar, this conversion can realize the expansion of transmitted signal bandwidth, the target of tiltedly finishing dealing with of going by receiving mixer is differentiated, and obtains the lifting of resolution ratio, but, when the intermediate-freuqncy signal of the modulation classification such as PSK, QAM of the use of communicating by letter in the time of modulation signal, due to the irreversibility of frequency multiplication mapping, cannot from transmit, recover transmitting information at receiving terminal, therefore the framework of Fig. 1 can effectively be realized the radar detection of high-resolution Terahertz but be not suitable for the Terahertz communication of common modulation system (PSK, QAM etc.). the modulated intermediate frequency signal of Fig. 2 is to be modulated on the spot-frequency local oscillation of Terahertz frequency range by frequency mixer, this is PSK, the generic structure of the Terahertz high-speed communication of the modulation systems such as QAM, although this system architecture is also suitable for Terahertz radar, but, what adopt due to the driving of transmitting local oscillator frequency multiplier chain is a source frequently, after frequency multiplication, cannot obtain the expansion of bandwidth, but Terahertz radar generally needs large bandwidth to realize high-resolution imaging, the large bandwidth that this framework transmits can only realize by the bandwidth that increases modulated intermediate frequency signal, and modulated intermediate frequency signal is generally in microwave band, very difficult while realizing the large bandwidth signal meeting the demands, generally can only accomplish several GHz, be difficult to adapt to the application demand of high-resolution imaging. in sum, these two kinds of frameworks are all not too suitable for radar and the chrp of communicating by letter.
In addition, no matter be Organization Chart 1 or Organization Chart 2, all there is following defect:
(1) contradiction of power and bandwidth:
Due to the restriction of solid state power amplifier state-of-the art, its power output is in mW magnitude, and bandwidth can reach more than 10%. because the power level of solid state power amplifier is difficult to meet application demand gradually, dotted line frame part in Fig. 1 is that it intends the improvement project adopting, by the cascade of electrovacuum amplifier, realize the Terahertz power stage of watt magnitude, but, due to the inherent characteristic restriction of electron tube, its bandwidth is difficult to mate with prime, therefore the relative bandwidth of whole piece transmitting chain approximately can only 2% left and right, and because the micro-processing technology of electron tube is not well solved, from disclosed document, only have at present 0.14THz and two sample pipes of 0.22THz at Terahertz center, China Physics Institute to have power stage, be difficult at short notice reach the requirement of application, cause the EIRP of these two kinds of frameworks all lower, limit the serviceability of the communication of high speed Terahertz and ultra broadband Terahertz radar. and electron tube is difficult to integrated and miniaturization, and need high pressure when work, bring inconvenience to the application of some occasion.
(2) be difficult to realize the problem of transmit-receive sharing:
Antenna aperture large (high EIRP) in the situation that, conventionally require transmit-receive sharing, transmit and receive link common antenna, this just need to adopt broad-band circulator in receiving-transmitting chain, framework as shown in Figure 3, and the circulator technology difficulty or ease of Terahertz frequency range solve, also there is no at present Related product, finding is maximum operating frequency 0.14THz, and bandwidth 1.6GHz cannot meet application demand far away.
(3) flexibility problem of structure:
Between this transmitting framework amplifier and transmitting antenna, adopt waveguide to be firmly connected, on the one hand, the flexibility in installation position selection is poor; On the other hand, under some application scenario, requiring antenna to be exposed to temperature conditions for example compares, in rugged environment (± 100 DEG C), and temperature on it can cause activated amplifier generation temperature hardwired with it to be floated by conduction, thereby affect amplifier performance, even cause it normally to work; And in the time of communication or radar requirement align search, a whole set of transmitting receiver all will, along with antenna rotates, affect the flexibility of servo control mechanism.
In view of above-mentioned number of drawbacks, can be applicable to Terahertz radar and communication system so need to design a kind of new framework simultaneously.
Summary of the invention
The present invention is only at the MMAOP framework that proposes to be applicable to Terahertz radar and communication system, it adopts frequency multiplication (Multiplier)+mixing (Mixer)+array to synthesize the implementation of (Array)+quasi-optical transmission (quasi-Optics)+parabola antenna (Parabolicantenna), obtain full-solid state high power terahertz emission source, can be applicable to Terahertz radar and communication system simultaneously.
Technical scheme of the present invention is as follows:
Be applicable to the novel MMAOP framework of one of Terahertz radar and communication system, it is characterized in that: comprise high-speed figure baseband board, high intermediate frequency frequency changer circuit, power splitter, Terahertz frequency multiplier chain, Terahertz frequency mixer or modem, terahertz filter, Terahertz solid state power amplifier, terahertz sources array, Terahertz wavelength-division device, Terahertz receive feed, Terahertz LNA, ellipsoidal mirror and parabola antenna.
Two outputs and an input of high-speed figure baseband board are connected to high intermediate frequency frequency changer circuit.
High intermediate frequency frequency changer circuit comprises two up-converter modules and a down conversion module, realizes intermediate frequency Up/Down Conversion and filter and amplification. Wherein the input signal of up-converter module one is provided by number base band plate, and its output is connected to Terahertz frequency mixer or modulator; The input signal of up-converter module two is also provided by number base band plate, and its output merit divides two-way respectively as the driving signal that transmits and receives Terahertz frequency multiplier chain; The input signal of down conversion module is the output of the low-noise amplifier of receiver, and the processing of high-speed figure baseband board settling signal is delivered in its output.
In transmitting branch, the signal of Terahertz frequency multiplier chain output is connected to Terahertz frequency mixer as local oscillation signal (LO), the output signal of up-converter module one is as the intermediate-freuqncy signal (IF) of Terahertz frequency mixer, the radiofrequency signal (RF) forming after mixing realizes bandpass filtering through terahertz filter, the output of terahertz filter is connected to Terahertz solid state power amplifier and realizes power amplification, the output of Terahertz solid state power amplifier is connected to terahertz sources array, in terahertz sources array, be divided into N × N road by merit, after amplifying array element amplification, N × N completes spatial power more synthetic, the output signal of terahertz sources array is irradiated to ellipsoidal mirror through interleaver, then radiate through parabola antenna.
At receiving branch, the terahertz signal that parabola antenna is collected is irradiated on interleaver through ellipsoidal mirror, being received feed by Terahertz collects, the output that Terahertz receives feed is connected to Terahertz LNA, the output of Terahertz LNA is connected to and receives Terahertz frequency mixer as its radiofrequency signal (RF), the signal that receives the output of Terahertz frequency multiplier chain is connected to Terahertz frequency mixer as local oscillation signal (LO), output intermediate-freuqncy signal (IF) end that receives Terahertz frequency mixer is connected to low-noise amplifier, down conversion module in the high intermediate frequency frequency changer circuit of output connecting band of low-noise amplifier.
This framework transmit-receive sharing, flexible structure is changeable, can adapt to radar and the more modulation standard of communicating by letter, and can adopt the baseband modulation (employing frequency mixer) such as QAM, PSK, FM, also can adopt the RF direct modulations such as OOK (transmitting adopts modulator, receives and adopts wave detector); The output of frequency multiplier chain can be a frequency (communication work employing), can be also Broad-band Modulated Signal (adopting when radar work).
When the present invention is used for radar system, operation principle is:
High-speed figure baseband board produces WBFM signal B2(bandwidth B and is generally hundreds of MHz to several GHz) and point-frequency signal B1, B2 and the B1 respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce have certain bandwidth microwave intermediate-freuqncy signal S2 and the microwave point-frequency signal S1 of (bandwidth B is generally hundreds of MHz to several GHz), the signal T21 that S2 forms by Terahertz frequency multiplier chain improves radar operating frequency, expansion radar bandwidth of operation according to frequency multiplication number of times, after M frequency multiplication, signal bandwidth can be by the B expansion T21 of S2 to M × B, broadband signal T21 and point-frequency signal S1 complete mixing in Terahertz frequency mixer, after utilizing solid-state power amplifier to amplify after band-pass filter, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity.
Echo-signal is through identical parabola antenna, separate with transmitting at interleaver place, enter THz(Terahertz) reception feed, through low-noise amplifier, in frequency mixer, complete down coversion with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, complete tiltedly (de-chirp) simultaneously, form the narrow band signal that carries target information, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, in high-speed figure baseband board, completes imaging.
The digital broadband FM signal that high-speed figure baseband board produces, be to be produced by the digital device in high-speed figure baseband board (as on-site programmable gate array FPGA, direct digital synthesiser DDS etc.), signal form has very large flexibility, can be linear frequency modulation, can be also nonlinear frequency modulation.
The generation (comprising the clock of data signal generation unit, the clock of high-speed figure baseband board) of all frequencies all based on same with reference to crystal oscillator, therefore, whole system is coherent, can improve the detectability of Terahertz radar system.
When the present invention is used for communication system, there is multiple-working mode, be respectively:
(1) base-band digital modulation. high-speed figure baseband board produces point-frequency signal B2 and modulates mutually QAM, phase-modulation PSK, frequency modulation(PFM) FM etc. with base-band digital modulation signal B1(width), B2 and the B1 respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce the microwave intermediate-freuqncy signal S1 of microwave point-frequency signal S2 and band modulation, S2 is as the driving signal of Terahertz frequency multiplier chain, produce T21 as the local oscillator of Terahertz frequency mixer through frequency multiplication to terahertz wave band, as the carrier signal of communication, S1 is as the intermediate frequency input signal of Terahertz frequency mixer, form the signal radiation of terahertz wave band through the carrier modulation of frequency mixer, the signal radiation of terahertz wave band forms single-side belt through bandpass filter filtering image frequency and transmits, after single-side belt transmits and utilizes solid-state power amplifier to amplify, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity.
Receiving signal collects through identical parabola antenna, separate with transmitting at interleaver place, enter THz and receive feed, through low-noise amplifier, in frequency mixer, complete and downconvert to microwave band with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, completes the high speed demodulation of information in high-speed figure baseband board.
(2) RF direct modulation. Terahertz frequency mixer in system transmitting branch adopts high-speed modulator, the signal bit stream that S1 is feed-in, and the switch of control high-speed modulator, forms the RF direct modulation to THz wave; Terahertz frequency mixer high speed demodulator in system receiving branch, by the direct detection to above-mentioned transmitting modulation signal, obtains transmission information, realizes on-off amplitude keying (on-offkeying, OOK) communication.
Described frequency mixer can adopt fundamental wave mixing device, also can adopt harmonic mixer.
System Effective Radiated Power promotes can three kinds of approach, and the bore of the primary reflection surface of described parabola antenna increases, and antenna gain improves, and the Effective Radiated Power of system increases; Described terahertz sources matrix number parameter N increases, and the synthetic power of spatial power improves, and the Effective Radiated Power of system increases; The cell power of amplifying array element in described terahertz sources array increases, and the synthetic power of spatial power improves, and the Effective Radiated Power of system increases.
Beneficial effect of the present invention is as follows:
The first, the framework of this hardware platform can be taken into account radar and the use of communicating by letter, and the two can time-sharing work, and the bandwidth of Terahertz radar baseband signal obtains broadening by frequency multiplication, can form super-resolution imaging capability;
The second, the THz source of this hardware structure adopts all solid state mode to realize, and is easy to integratedly, and reliability is high;
The 3rd, adopt array synthetic technology, under the condition of the effective bandwidth of operation of guarantee system, improve power output.
The 4th, the beam waveguide of employing terahertz wave band, makes system architecture more flexible, and extensibility is strong, simplifies to follow the tracks of and aims at Servo Design;
The 5th, adopt terahertz wave band quasi-optical technique, coordinate high-gain reflector antenna, improve Terahertz Radar-Communication system Effective Radiated Power.
System also has following features:
1). the receiving-transmitting chain of this framework is all realized by all solid state mode, favorable repeatability, and be convenient to integrated and miniaturization;
2). adopt the synthetic method of array manifold power to improve the power output of THz source, extensibility is good, the passage consistency that also cannot support large scale array in conditions such as design and processes levels requires, can first adopt little array, obtain medium power output, along with the progress of technology, strengthen gradually array quantity, improve the power output of single array element, thereby improve radiant power.
Brief description of the drawings
Fig. 1 is the terahertz sources machine configuration diagram of frequency multiplication local vibration source+mixed modulated+solid state power amplifier+electrovacuum amplification+antenna;
Fig. 2 is the terahertz sources machine configuration diagram of base band (intermediate frequency) modulation+frequency multiplication+solid state power amplifier+electrovacuum amplification+antenna;
Fig. 3 is duplexer Terahertz radar configuration diagram;
Fig. 4 is system block diagram of the present invention.
Detailed description of the invention
The present invention is applicable to the novel MMAOP framework of one of Terahertz radar and communication system, as shown in Figure 4, comprise high-speed figure baseband board, high intermediate frequency frequency changer circuit, power splitter, Terahertz frequency multiplier chain, Terahertz frequency mixer or modem, terahertz filter, Terahertz solid state power amplifier, terahertz sources array, Terahertz wavelength-division device, Terahertz receive feed, Terahertz LNA, ellipsoidal mirror and parabola antenna.
Two outputs and an input of high-speed figure baseband board are connected to high intermediate frequency frequency changer circuit.
High intermediate frequency frequency changer circuit comprises two up-converter modules and a down conversion module, realizes intermediate frequency Up/Down Conversion and filter and amplification. Wherein the input signal of up-converter module one is provided by number base band plate, and its output is connected to Terahertz frequency mixer or modulator; The input signal of up-converter module two is also provided by number base band plate, and its output merit divides two-way respectively as the driving signal that transmits and receives Terahertz frequency multiplier chain; The input signal of down conversion module is the output of the low-noise amplifier of receiver, and the processing of high-speed figure baseband board settling signal is delivered in its output.
In transmitting branch, the signal of Terahertz frequency multiplier chain output is connected to Terahertz frequency mixer as local oscillation signal (LO), the output signal of up-converter module one is as the intermediate-freuqncy signal (IF) of Terahertz frequency mixer, the radiofrequency signal (RF) forming after mixing realizes bandpass filtering through terahertz filter, the output of terahertz filter is connected to Terahertz solid state power amplifier and realizes power amplification, the output of Terahertz solid state power amplifier is connected to terahertz sources array, in terahertz sources array, be divided into N × N road by merit, after amplifying array element amplification, N × N completes spatial power more synthetic, the output signal of terahertz sources array is irradiated to ellipsoidal mirror through interleaver, then radiate through parabola antenna.
At receiving branch, the terahertz signal that parabola antenna is collected is irradiated on interleaver through ellipsoidal mirror, being received feed by Terahertz collects, the output that Terahertz receives feed is connected to Terahertz LNA, the output of Terahertz LNA is connected to and receives Terahertz frequency mixer as its radiofrequency signal (RF), the signal that receives the output of Terahertz frequency multiplier chain is connected to Terahertz frequency mixer as local oscillation signal (LO), output intermediate-freuqncy signal (IF) end that receives Terahertz frequency mixer is connected to low-noise amplifier, down conversion module in the high intermediate frequency frequency changer circuit of output connecting band of low-noise amplifier.
This framework transmit-receive sharing, flexible structure is changeable, can adapt to radar and the more modulation standard of communicating by letter, and can adopt the baseband modulation (employing frequency mixer) such as QAM, PSK, FM, also can adopt the RF direct modulations such as OOK (transmitting adopts modulator, receives and adopts wave detector); The output of frequency multiplier chain can be a frequency (communication work employing), can be also Broad-band Modulated Signal (adopting when radar work).
When the present invention is used for radar system, operation principle is:
High-speed figure baseband board produces WBFM signal B2(bandwidth B and is generally hundreds of MHz to several GHz) and point-frequency signal B1, B2 and the B1 respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce have certain bandwidth microwave intermediate-freuqncy signal S2 and the microwave point-frequency signal S1 of (bandwidth B is generally hundreds of MHz to several GHz), the signal T21 that S2 forms by Terahertz frequency multiplier chain improves radar operating frequency, expansion radar bandwidth of operation according to frequency multiplication number of times, after M frequency multiplication, signal bandwidth can be by the B expansion T21 of S2 to M × B, broadband signal T21 and point-frequency signal S1 complete mixing in Terahertz frequency mixer, after utilizing solid-state power amplifier to amplify after band-pass filter, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity.
Echo-signal is through identical parabola antenna, separate with transmitting at interleaver place, enter THz and receive feed, through low-noise amplifier, in frequency mixer, complete down coversion with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, complete tiltedly (de-chirp) simultaneously, form the narrow band signal that carries target information, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, in high-speed figure baseband board, completes imaging
The digital broadband FM signal that high-speed figure baseband board produces, be to be produced by the digital device in high-speed figure baseband board (as on-site programmable gate array FPGA, direct digital synthesiser DDS etc.), signal form has very large flexibility, can be linear frequency modulation, can be also nonlinear frequency modulation.
The generation (comprising high-speed figure baseband board clock) of all frequencies all based on same with reference to crystal oscillator, therefore, whole system is coherent, can improve the detectability of Terahertz radar system.
When the present invention is used for communication system, there is multiple-working mode, be respectively:
(1) base-band digital modulation. high-speed figure baseband board produces point-frequency signal B2 and modulates mutually QAM, phase-modulation PSK, frequency modulation(PFM) FM etc. with base-band digital modulation signal B1(width), B2 and the B1 respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce the microwave intermediate-freuqncy signal S1 of microwave point-frequency signal S2 and band modulation, S2 is as the driving signal of Terahertz frequency multiplier chain, produce T21 as the local oscillator of Terahertz frequency mixer through frequency multiplication to terahertz wave band, as the carrier signal of communication, S1 is as the intermediate frequency input signal of Terahertz frequency mixer, form the signal radiation of terahertz wave band through the carrier modulation of frequency mixer, the signal radiation of terahertz wave band forms single-side belt through bandpass filter filtering image frequency and transmits, after single-side belt transmits and utilizes solid-state power amplifier to amplify, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity.
Receiving signal collects through identical parabola antenna, separate with transmitting at interleaver place, enter THz and receive feed, through low-noise amplifier, in frequency mixer, complete and downconvert to microwave band with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, completes the high speed demodulation of information in high-speed figure baseband board.
(2) RF direct modulation. Terahertz frequency mixer in system transmitting branch adopts high-speed modulator, the signal bit stream that S1 is feed-in, and the switch of control high-speed modulator, forms the RF direct modulation to THz wave; Terahertz frequency mixer high speed demodulator in system receiving branch, by the direct detection to above-mentioned transmitting modulation signal, obtains transmission information, realizes on-off amplitude keying (on-offkeying, OOK) communication.
Described frequency mixer can adopt fundamental wave mixing device, also can adopt harmonic mixer.
System Effective Radiated Power promotes can three kinds of approach, and the bore of the primary reflection surface of described parabola antenna increases, and antenna gain improves, and the Effective Radiated Power of system increases; Described terahertz sources matrix number parameter N increases, and the synthetic power of spatial power improves, and the Effective Radiated Power of system increases; The cell power of amplifying array element in described terahertz sources array increases, and the synthetic power of spatial power improves, and the Effective Radiated Power of system increases.
Claims (10)
1. the MMAOP framework that is applicable to Terahertz radar and communication system, is characterized in that: comprise that high-speed figure baseband board, high intermediate frequency frequency changer circuit, power splitter, Terahertz frequency multiplier chain, Terahertz frequency mixer or modem, terahertz filter, Terahertz solid state power amplifier, terahertz sources array, Terahertz wavelength-division device, Terahertz receive feed, Terahertz LNA, ellipsoidal mirror and parabola antenna;
Two outputs and an input of high-speed figure baseband board are all connected to high intermediate frequency frequency changer circuit;
High intermediate frequency frequency changer circuit comprises two up-converter modules and a down conversion module, realizes intermediate frequency Up/Down Conversion and filter and amplification; Two up-converter modules are up-converter module one and up-converter module two, and wherein, the input signal of up-converter module one is provided by number base band plate, and its output is connected to Terahertz frequency mixer or modem; The input signal of up-converter module two is also provided by number base band plate, and its output merit divides two-way respectively as the driving signal that transmits and receives Terahertz frequency multiplier chain; The input signal of down conversion module is the output of the low-noise amplifier of receiver, and the processing of high-speed figure baseband board settling signal is delivered in its output;
In transmitting branch, the signal of Terahertz frequency multiplier chain output is connected to Terahertz frequency mixer as local oscillation signal, the output signal of up-converter module one is as the intermediate-freuqncy signal of Terahertz frequency mixer, the radiofrequency signal forming after mixing realizes bandpass filtering through terahertz filter, the output of terahertz filter is connected to Terahertz solid state power amplifier and realizes power amplification, the output of Terahertz solid state power amplifier is connected to terahertz sources array, in terahertz sources array, be divided into N × N road by merit, then it is synthetic after N × N amplifies array element amplification, to complete spatial power; The output signal of terahertz sources array is irradiated to ellipsoidal mirror through interleaver, then radiate through parabola antenna;
In receiving branch, the terahertz signal that parabola antenna is collected is irradiated on interleaver through ellipsoidal mirror, being received feed by Terahertz collects, the output that Terahertz receives feed is connected to Terahertz LNA, the output of Terahertz LNA is connected to and receives Terahertz frequency mixer as its radiofrequency signal, the signal that receives the output of Terahertz frequency multiplier chain is connected to Terahertz frequency mixer as local oscillation signal, the output intermediate-freuqncy signal end that receives Terahertz frequency mixer is connected to low-noise amplifier, the output of low-noise amplifier is connected to the down conversion module in high intermediate frequency frequency changer circuit.
2. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, is characterized in that: when this framework is used for radar system, operation principle is:
High-speed figure baseband board produces WBFM signal and point-frequency signal, WBFM signal and the point-frequency signal respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce microwave intermediate-freuqncy signal and the microwave point-frequency signal with certain bandwidth, the signal T21 that microwave intermediate-freuqncy signal forms by Terahertz frequency multiplier chain improves radar operating frequency, expansion radar bandwidth of operation according to frequency multiplication number of times, after M frequency multiplication, signal bandwidth can be by the B expansion T21 of microwave intermediate-freuqncy signal to M × B, broadband signal T21 and point-frequency signal complete mixing in Terahertz frequency mixer, after utilizing solid-state power amplifier to amplify after band-pass filter, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity,
Echo-signal is through identical parabola antenna, separate with transmitting at interleaver place, enter Terahertz and receive feed, through low-noise amplifier, in frequency mixer, complete down coversion with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, complete tiltedly simultaneously, form the narrow band signal that carries target information, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, in high-speed figure baseband board, completes imaging.
3. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 2, is characterized in that: WBFM signal is produced by the digital device in high-speed figure baseband board, is linear FM signal or nonlinear frequency modulation signal.
4. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 2, is characterized in that: in system the generation of all frequencies all based on same with reference to crystal oscillator to ensure the coherent of system.
5. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, is characterized in that: when this framework is used for communication system, have the mode of operation of base-band digital modulation, be specially:
High-speed figure baseband board produces point-frequency signal and base-band digital modulation signal, point-frequency signal and base-band digital the modulation signal respectively up-converter module two in high intermediate frequency frequency changer circuit and up-converter module one produce the microwave intermediate-freuqncy signal of microwave point-frequency signal and band modulation, microwave point-frequency signal is as the driving signal of Terahertz frequency multiplier chain, produce T21 as the local oscillator of Terahertz frequency mixer through frequency multiplication to terahertz wave band, as the carrier signal of communication, the microwave intermediate-freuqncy signal of band modulation is as the intermediate frequency input signal of Terahertz frequency mixer, form the signal radiation of terahertz wave band through the carrier modulation of frequency mixer, the signal radiation of terahertz wave band forms single-side belt through bandpass filter filtering image frequency and transmits, after single-side belt transmits and utilizes solid-state power amplifier to amplify, merit is divided into N × N road signal, N × N road signal after merit is divided carries out power amplification in each array element of spatial power synthesis unit feed-in N × N array respectively, by designing the phase response characteristic of each road power amplifier, make the terahertz emission signal on N × N road in specific direction, form stack in the same way, thereby it is synthetic to complete spatial power, reach the object that improves Effective Radiated Power, the quasi-optical light path that radiation signal forms by beam waveguide, be fed into the minor face of parabola antenna through interleaver and ellipsoidal mirror, after primary reflection surface pack by parabola antenna, launch again, wherein, the numerical value of N is determined by array quantity,
Receiving signal collects through identical parabola antenna, separate with transmitting at interleaver place, enter Terahertz and receive feed, through low-noise amplifier, in frequency mixer, complete and downconvert to microwave band with the terahertz signal that receives the generation of Terahertz frequency multiplier chain, the down conversion module entering in high intermediate frequency frequency changer circuit is down-converted to base band, completes the high speed demodulation of information in high-speed figure baseband board.
6. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, is characterized in that: when this framework is used for communication system, have the mode of operation of RF direct modulation, be specially:
Terahertz frequency mixer in system transmitting branch adopts high-speed modulator, the signal bit stream that the microwave intermediate-freuqncy signal of band modulation is feed-in, and the switch of control high-speed modulator, forms the RF direct modulation to THz wave; Terahertz frequency mixer high speed demodulator in system receiving branch, by the direct detection to above-mentioned transmitting modulation signal, obtains transmission information, realizes the communication of on-off amplitude keying.
7. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, is characterized in that: described frequency mixer adopts fundamental wave mixing device, or adopts harmonic mixer.
8. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, is characterized in that: in the time that the bore of the primary reflection surface of described parabola antenna increases, antenna gain improves, and the Effective Radiated Power of system is corresponding increase also.
9. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, it is characterized in that: in the time that described terahertz sources matrix number parameter N increases, the synthetic power of spatial power improves, and the Effective Radiated Power of system is corresponding increase also.
10. the MMAOP framework that is applicable to Terahertz radar and communication system according to claim 1, it is characterized in that: while amplifying the cell power increase of array element in described terahertz sources array, the synthetic power of spatial power improves, and the Effective Radiated Power of system is corresponding increase also.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410094418.3A CN103901404B (en) | 2014-03-14 | 2014-03-14 | Be applicable to the MMAOP framework of Terahertz radar and communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410094418.3A CN103901404B (en) | 2014-03-14 | 2014-03-14 | Be applicable to the MMAOP framework of Terahertz radar and communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103901404A CN103901404A (en) | 2014-07-02 |
| CN103901404B true CN103901404B (en) | 2016-05-11 |
Family
ID=50992854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410094418.3A Expired - Fee Related CN103901404B (en) | 2014-03-14 | 2014-03-14 | Be applicable to the MMAOP framework of Terahertz radar and communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103901404B (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104701634B (en) * | 2015-02-05 | 2018-01-30 | 北京理工大学 | A kind of quasi-optical power combing of Terahertz and amplifying device |
| CN106019397B (en) * | 2016-04-08 | 2018-06-01 | 中国工程物理研究院电子工程研究所 | A kind of THz-QoMIMO frameworks suitable for Terahertz safety check instrument |
| CN106019282B (en) * | 2016-05-04 | 2019-02-22 | 常州工学院 | Vehicle-mounted millimeter wave detection and the communicating integral sensor of wisdom traffic system application |
| CN105974491A (en) * | 2016-05-06 | 2016-09-28 | 中国工程物理研究院电子工程研究所 | Terahertz safety check imaging system based on vector network analyzer |
| CN105891900A (en) * | 2016-06-03 | 2016-08-24 | 中国工程物理研究院电子工程研究所 | Security inspection system of active terahertz two-dimensional high-speed scanning imaging |
| CN105866850B (en) * | 2016-06-03 | 2018-06-01 | 中国工程物理研究院电子工程研究所 | A kind of remote human body hidden dangerous goods detector based on radar target polarization characteristic |
| CN106253940B (en) * | 2016-09-07 | 2019-05-31 | 清华大学 | A kind of Terahertz Active Imaging transceiver of integrated on-chip antenna |
| CN106603015A (en) * | 2016-12-29 | 2017-04-26 | 中国科学院国家空间科学中心 | Terahertz mixer realizing short baseline measurement and front-end of receiver |
| CN107819490A (en) * | 2017-09-14 | 2018-03-20 | 天津大学 | A kind of pulse ultra-broad band Terahertz receives and dispatches framework |
| CN107768841A (en) * | 2017-09-19 | 2018-03-06 | 清华大学 | Terahertz antenna system |
| CN108337204B (en) * | 2017-12-26 | 2020-12-25 | 北京航天测控技术有限公司 | Miniaturized broadband vector signal up-conversion circuit |
| CN108196229B (en) * | 2018-02-11 | 2022-01-28 | 哈尔滨工业大学 | Communication radar integrated design method based on time modulation array |
| CN108988914B (en) * | 2018-08-29 | 2020-10-23 | 西安空间无线电技术研究所 | Terahertz communication beam backtracking device and method based on double-conjugate frequency mixing |
| CN110109082A (en) * | 2019-04-17 | 2019-08-09 | 天津大学 | A kind of Terahertz Active Radar imaging array of shared antenna |
| CN110190864A (en) * | 2019-07-04 | 2019-08-30 | 苏州特拉芯光电技术有限公司 | A kind of distribution local oscillator Terahertz superhet array acceptor |
| CN111289963A (en) * | 2020-02-29 | 2020-06-16 | 哈尔滨吉赫科技有限责任公司 | Continuous millimeter wave terahertz ultra-wideband noise radar |
| CN112737667B (en) * | 2020-12-29 | 2023-09-01 | 成都星时代宇航科技有限公司 | Terahertz experiment signal transmission assembly and device for space communication |
| CN112583493B (en) * | 2021-01-06 | 2022-03-15 | 广东省新一代通信与网络创新研究院 | Short-distance terahertz communication system and signal sending and receiving method |
| CN113346940B (en) * | 2021-06-01 | 2023-03-28 | 中国电子科技集团公司第五十四研究所 | Terahertz communication system applicable to low-earth-orbit satellites |
| CN113759221A (en) * | 2021-08-27 | 2021-12-07 | 江苏省电力试验研究院有限公司 | Terahertz sensor chip for insulator monitoring and insulator monitoring method |
| CN113890629B (en) * | 2021-10-20 | 2023-03-24 | 网络通信与安全紫金山实验室 | Terahertz signal receiving device and method and signal transmission system |
| CN115548620B (en) * | 2022-12-01 | 2023-03-21 | 四川太赫兹通信有限公司 | Power divider, transmitting front end, receiving front end and communication system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7378658B2 (en) * | 2005-09-20 | 2008-05-27 | Coherent, Inc. | Security portal with THz trans-receiver |
| CN101726362A (en) * | 2009-11-23 | 2010-06-09 | 首都师范大学 | Terahertz polarization analyzer and terahertz polarization measurement method |
| CN101943803A (en) * | 2010-07-07 | 2011-01-12 | 电子科技大学 | Structural material for modulation of terahertz waves |
| CN103454618A (en) * | 2013-09-07 | 2013-12-18 | 西安电子科技大学 | System and method for transmitting terahertz radar signal based on digital pre-distortion |
-
2014
- 2014-03-14 CN CN201410094418.3A patent/CN103901404B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7378658B2 (en) * | 2005-09-20 | 2008-05-27 | Coherent, Inc. | Security portal with THz trans-receiver |
| CN101726362A (en) * | 2009-11-23 | 2010-06-09 | 首都师范大学 | Terahertz polarization analyzer and terahertz polarization measurement method |
| CN101943803A (en) * | 2010-07-07 | 2011-01-12 | 电子科技大学 | Structural material for modulation of terahertz waves |
| CN103454618A (en) * | 2013-09-07 | 2013-12-18 | 西安电子科技大学 | System and method for transmitting terahertz radar signal based on digital pre-distortion |
Non-Patent Citations (1)
| Title |
|---|
| Alleviating Sensor Position Error in Source;Le Yang;《IEEE TRANSACTIONS ON SIGNAL PROCESSING》;20100131;第58卷(第1期);正文67-83页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103901404A (en) | 2014-07-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103901404B (en) | Be applicable to the MMAOP framework of Terahertz radar and communication system | |
| CN1820429B (en) | Milliwave band radio communication method and system | |
| CN103401072B (en) | Periodic amplitude control-based phased-array antenna system and wave beam control method | |
| CN102680963A (en) | Radar apparatus supporting short and long range radar operation | |
| CN103064080B (en) | Target guiding radar with continuous waves | |
| CN103744078B (en) | A kind of microwave based on different code speed random frequency hopping stares relevance imaging device | |
| US20120146842A1 (en) | Rf transceiver for radar sensor | |
| CN103117792B (en) | Dual-band channel multiplexing small-scale measurement and control data transmission system | |
| CN104300974A (en) | System and method for a radio frequency system | |
| CN111751812A (en) | Microwave photon time division multiplexing MIMO radar detection method and system | |
| Statnikov et al. | A 240 GHz circular polarized FMCW radar based on a SiGe transceiver with a lens-integrated on-chip antenna | |
| CN103067080A (en) | Multichannel transmission system of millimeter-wave signals | |
| JP2015064291A (en) | Communication-radar shared antenna device | |
| Lu et al. | A Millimeter Wave Backscatter Network for Two-Way Communication and Localization | |
| CN110471059A (en) | A kind of miniaturization mm-wave imaging radar installations | |
| CN216870803U (en) | Pseudo-random noise radar integrated chip | |
| US11855585B2 (en) | Device and method for receiving and demodulating an amplitude-modulated RF signal | |
| Goshi et al. | Recent advances in retrodirective system technology | |
| Guermandi et al. | Phase modulated MM-wave radars in advanced CMOS technology | |
| CN110995290A (en) | Wideband radio frequency transceiver architecture supporting UWB and FMCW dual modes | |
| CN111781581A (en) | Terahertz radar system suitable for fine gesture recognition | |
| CN207075013U (en) | Millimeter-wave communication system | |
| WO2024113318A1 (en) | Signal processing system and related device | |
| CN114325715B (en) | Radar structure and system | |
| Souzandeh et al. | Classification of Frequency Bands in the Joint Millimeter-Wave Sensing and Communication System (JSCS): A Comprehensive Analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20170314 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |