CN105223556A - L-type transmitting-receiving array antenna front end and signal processing method thereof - Google Patents
L-type transmitting-receiving array antenna front end and signal processing method thereof Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The present invention relates to a kind of L-type transmitting-receiving array antenna front end and signal processing method thereof, front end is by emitting antenna, transmitter, pitching dimension word receiving array antenna, pitching dimension multichannel receiver, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal processor composition, the output terminal of transmitter connects the input end of emitting antenna, the input end of the output termination pitching dimension multichannel receiver of pitching dimension word receiving array antenna, the input end of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna, the input end of the pitching dimension output terminal of multichannel receiver and the output termination signal processor of azimuth dimension multichannel receiver.
Description
Technical field
The invention belongs to sensor (radar) field of detecting, be specifically related to a kind of in detection short range, the L-type array antenna formed in high-speed moving object and signal processing technology thereof.
Background technology
Along with the development of automatic technology, people need the Measurement accuracy short range in some fields, high-speed moving object being carried out to target location, speed, early stage measuring system expects that applied optics system such as infrared, TV and laser etc. carry out combined measurement realization, but optical system is very large due to climate, harsh environmental effects, makes it apply and is very limited; Based on wireless measuring system due to by non-cpntact measurement, present that measuring media is wide, degree of accuracy is high, corrosion-resistant, antijamming capability is stronger and information transmission facilitates advantage, can meet the needs of application.
Short range, high-speed moving object radio survey system, the development of its technical system is mainly subject to the impact of electron device high speed development, the particularly development of signal processor from DSP (DigitalSignalProcessing: digital signal processor) to FPGA, signal handling capacity is improved greatly, achieve the technology such as DBF (DatabeamForming: digital bea mforming), L-type transmitting-receiving array antenna front end and signal processing method thereof are exactly produce under such technical background.L-type transmitting-receiving array antenna front end and signal processing method thereof compare simple electromagnetic horn front end in the past, there is the feature that receive-transmit system isolation is high, detection accuracy is high under continuous wave system, compare with the phased array antenna front end of other single polarization mode owing to adopting 45 ° of inclined polarizations to have target property strong adaptability, affect little feature by ground clutter.
Based on short range, high-speed moving object radio survey system, there is the requirement of high detection probability, low false-alarm probability.Can come to, wide by automatic distinguishing, the decoys such as the stone splash for operational vehicle or moving vehicle, flying bird, the personnel that walk about respond.Because short range, high-speed target speed are high, therefore detection system must the parameter of measurement target quickly and accurately, thus improves the response time of system.Detection system also should have good Low emissivity characteristic, antijamming capability and Electro Magnetic Compatibility characteristic.From the application demand that should meet miniaturization, low energy consumption, strong adaptive capacity to environment application of engineering project.
Summary of the invention
The technical matters solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of the L-type transmitting-receiving array antenna front end and the signal processing method thereof that are applicable to the detection of Short Range High Speed moving target.
Technical scheme
A kind of L-type transmitting-receiving array antenna front end, is characterized in that comprising emitting antenna, transmitter, pitching dimension word receiving array antenna, pitching dimension multichannel receiver, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal processor; The output terminal of transmitter connects the input end of emitting antenna, the input end of the output termination pitching dimension multichannel receiver of pitching dimension word receiving array antenna, the input end of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna, the input end of the pitching dimension output terminal of multichannel receiver and the output termination signal processor of azimuth dimension multichannel receiver.
Described emitting antenna, pitching dimension word receiving array antenna, azimuth dimension digital received array antenna structurally all adopt 45 ° to reverse waveguide and realize, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna form L-type structure, are provided with transceiver insulation baffle plate, transceiver insulation part between L-type structure and emitting antenna.
Described pitching dimension word receiving array antenna, azimuth dimension digital received array antenna are made up of some Wave guide unit parallel arranged of identical bore, and each group Wave guide unit comprises antenna element, feeder unit composition.
Described pitching dimension multichannel receiver, azimuth dimension multichannel receiver are made up of the signal processing circuit that identical some groups are arranged in parallel, and each group signal processing circuit is made up of low noise amplifier, frequency mixer, wave filter and intermediate frequency amplifier.
Described signal processor comprises A/D sampling unit, FPGA processor unit and high-speed interface unit.
The signal processing method adopting described L-type transmitting-receiving array antenna front end to realize, is characterized in that step is as follows:
Step 1: signal S1 (n) is given the radiation of emitting antenna figuration by transmitter;
Step 2: signal S2 (n) that pitching dimension word receiving array antenna receives obtains signal S4 (n) and gives signal processor after pitching dimension word multichannel receiver process low noise amplification, mixing, wave filter and intermediate frequency amplify;
Signal S3 (n) of azimuth dimension digital received array antenna received obtains signal S5 (n) and also gives signal processor after orientation dimension word multichannel receiver process low noise amplification, mixing, wave filter and intermediate frequency amplify;
Step 3: signal S4 (n), the S5 (n) that receive are carried out A/D conversion, DDC, high-pass filtering, DBF, MTI/MTD, ask mould by signal processor, CFAR process, threshold judgement, target cohesion, send with signal S6 (n) after target pairing.
Beneficial effect
A kind of L-type transmitting-receiving array antenna front end that the present invention proposes and signal processing method thereof, according to high-speed mobile target property, propose to use L-type transmitting-receiving array antenna 45 ° to reverse the inclined polarization mode of waveguide, different target type can be taken into account to needs that are vertical, horizontal polarized wave sensitive detection, the multiple polarizing target echo of effective increase, effectively can suppress the interference of ground clutter, background clutter simultaneously, be very suitable for the measurement of short range, high-speed target.
Accompanying drawing explanation
Fig. 1 is overall electrical block diagram of the present invention
Fig. 2 is the antenna shapes schematic diagram of L-type transmitting-receiving array antenna
Fig. 3 is the hardware composition of the front end receiver signal of L-type transmitting-receiving array antenna
Wherein: 9-antenna radiation unit, 10-feeder unit, 11-low noise amplifier, 12-frequency mixer, 13-wave filter, 14-intermediate frequency amplifier, 15-A/D sampling unit, 16-FPGA processor unit, 17-high-speed interface unit
Fig. 4 is that signal processor ties up the processing procedure of array received signal and azimuth dimension array received signal to pitching
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Linear frequency modulation continuous wave signal madulation to carrier frequency, and is given emitting antenna with S1 (n) form after carrying out power amplification by transmitter, and emitting antenna carries out figuration radiation according to the pitching dimension of designing requirement, azimuth dimension coverage.Target echo signal S2 (n) that pitching dimension word receiving array antenna receives gives pitching dimension word multichannel receiver, first receiver carries out low noise amplification: make microwave signal obtain certain gain and amplify, and meet the power input of frequency mixer; Secondly microwave signal and local oscillation signal carry out being down-converted to intermediate-freuqncy signal (intermediate-freuqncy signal carrier frequency is determined according to signal bandwidth, local oscillator etc.) by frequency mixer; Then for the intermediate-freuqncy signal after mixing, the gating of certain passband is realized with wave filter; Last intermediate frequency amplifier guarantees that certain dynamic intermediate-freuqncy signal is all the time in the sample range of A/D sampling thief.Intermediate-freuqncy signal S4 (n) after process is given signal processor by pitching dimension word multichannel receiver; In like manner signal S3 (n) of azimuth dimension digital received array antenna received obtains signal S5 (n) and also gives signal processor after orientation dimension word multichannel receiver process.Signal processor carries out A/D sampling to the S4 (n) sent into, S5 (n) signal, carry out the DDC of pitching peacekeeping azimuth dimension, high-pass filtering, DBF, MTI/MTD respectively, ask the process such as mould, CFAR process, threshold judgement, target cohesion, azimuth dimension is wide pitching is narrow for the synthesis wave beam sending signal processor to carry out DBF process due to pitching dimension hyperchannel Received signal strength, therefore the measuring accuracy tieed up in pitching of target is high and the metrical information of azimuth dimension is fuzzy, its information comprises orientation, pitching, distance, speed and target strength etc.In like manner azimuth dimension hyperchannel Received signal strength send signal transacting to carry out DBF process synthesis wave beam in orientation narrow and pitching dimension wide, then the measuring accuracy of azimuth dimension target is high, information fuzzy is tieed up in pitching, and the information of target also comprises the parameters such as orientation, pitching, distance, speed and target strength.The information of pitching dimension receiving cable, azimuth dimension receiving cable after process is carried out pairing process by signal processor, and obtain same target azimuth, pitching, Distance geometry speed accurate information, this is one of innovation of the present invention, and its main signal treatment scheme as shown in Figure 1.
Core of the present invention is L-type transmitting-receiving array antenna, comprises emitting antenna, pitching dimension word receiving array antenna, azimuth dimension digital received array antenna and transceiver insulation part.Its detailed construction is as shown in Figure 2: the shape assumption diagram (wherein pitching, azimuth dimension digital received array antenna are from L-shaped in shape) mainly comprising emitting antenna, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna; Receive-transmit isolation index passes through at emitting antenna and receiving antenna (pitching, azimuth dimension digital received antenna) increases transceiver insulation baffle plate and absorbing material realizes, wherein transceiver insulation height of baffle plate, width need to be determined by electromagnetic simulation software emulation, the absorbing material of respective antenna working frequency range is installed in transceiver insulation part, the adjustment of bonding area, position can be carried out according to test result.
Emitting antenna, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna radiating element all adopt 45 ° to reverse waveguide, take into account different target type to needs that are vertical, horizontal polarized wave sensitive detection, the multiple polarizing target echo of effective increase, effectively suppresses the impact of the clutters such as atural object simultaneously;
Transmitted antednna beam requires to carry out Shape design, and its coverage comprises the range of receiving of pitching dimension, azimuth dimension digital received array antenna.
Pitching dimension word receiving array antenna and orientation are that digital received array antenna unit number (N) is decided by the beam angle designed and measuring accuracy;
The isolation index of transceiver insulation part and transmitting-receiving baffle plate demand fulfillment receive-transmit system when continuous wave mode of operation.
Fig. 3 is the chief component of L-type transmitting-receiving array antenna front end, wherein pitching dimension word receiving array antenna, azimuth dimension digital received array antenna comprise antenna radiation unit and feeder unit, antenna radiation unit realizes the reception and the amplification that receive echo, and feeder unit realizes microwave from waveguide to the conversion of micro-band.Pitching dimension multichannel receiver and azimuth dimension multichannel receiver are made up of LNA unit, frequency mixer, wave filter and intermediate frequency amplifier, realize the LNA of microwave signal, mixing (downconverting to intermediate-freuqncy signal), filtering and intermediate frequency and amplify.Signal processor comprises A/D sampling unit, FPGA processor unit, high-speed interface unit, realizes pitching dimension, azimuth dimension IF signal processing, information is sent through high-speed interface.
Fig. 4 is that signal processor is to the pitching dimension received, the processing procedure of azimuth dimension intermediate-freuqncy signal, by converting the A/D of signal, Digital Down Convert (DDC:DigitalDownConverter), high-pass filtering, DBF, Fourier change/ChipZ converts (FFT:FastFourierTransform/CZT:ChirpZTransformation), Moveing target indication/moving target detect (MTI:MovingTargetIndicator/MTD:MovingTargetDetection), ask mould, CFAR process (CFAR:ConstantFalseAlarmRate), threshold judgement, target is condensed, target joins peer processes, target information is sent.
The signal transacting essence of L-type transmitting-receiving array antenna is the DBF process to two one dimensional linear array, Processing Algorithm operand is little and low for hardware requirement, possess good real-time, be very suitable for short range, high-speed target detection system, effective from engineering practice checking.
The present invention is simultaneously in order to realize miniaturization and low-cost design, thinking integrated, passage little in the size that orientation, pitching dimension word multichannel receiver require is many, LTCC integrated technique is utilized multipath reception channel chip group to be packaged together, form the combination of hyperchannel multi pack, with weight reduction, compression volume; Secondly in front end, transmitter, frequency synthesizer, electric power network etc. are carried out integrated design, substantially realize the direct and comprehensive blindmate docking of module, formed without lead-in wire front, can while raising front integrated level, simplify front annexation, improve reliability.
Claims (6)
1. a L-type transmitting-receiving array antenna front end, is characterized in that comprising emitting antenna, transmitter, pitching dimension word receiving array antenna, pitching dimension multichannel receiver, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal processor; The output terminal of transmitter connects the input end of emitting antenna, the input end of the output termination pitching dimension multichannel receiver of pitching dimension word receiving array antenna, the input end of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna, the input end of the pitching dimension output terminal of multichannel receiver and the output termination signal processor of azimuth dimension multichannel receiver.
2. a kind of L-type transmitting-receiving array antenna front end according to claim 1, it is characterized in that described emitting antenna, pitching dimension word receiving array antenna, azimuth dimension digital received array antenna structurally all adopt 45 ° to reverse waveguide and realize, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna form L-type structure, are provided with transceiver insulation baffle plate, transceiver insulation part between L-type structure and emitting antenna.
3. a kind of L-type transmitting-receiving array antenna front end according to claim 1, it is characterized in that described pitching dimension word receiving array antenna, azimuth dimension digital received array antenna are made up of some Wave guide unit parallel arranged of identical bore, each group Wave guide unit comprises antenna element (9), feeder unit (10) composition.
4. a kind of L-type transmitting-receiving array antenna front end according to claim 1, it is characterized in that multichannel receiver is tieed up in described pitching, azimuth dimension multichannel receiver is made up of the signal processing circuit that identical some groups are arranged in parallel, each group signal processing circuit is made up of low noise amplifier (11), frequency mixer (12), wave filter (13) and intermediate frequency amplifier (14).
5. a kind of L-type transmitting-receiving array antenna front end according to claim 1, is characterized in that described signal processor comprises A/D sampling unit, FPGA processor unit and high-speed interface unit.
6. the signal processing method adopting L-type according to claim 1 transmitting-receiving array antenna front end to realize, is characterized in that step is as follows:
Step 1: signal S1 (n) is given the radiation of emitting antenna figuration by transmitter;
Step 2: signal S2 (n) that pitching dimension word receiving array antenna receives obtains signal S4 (n) and gives signal processor after pitching dimension word multichannel receiver process low noise amplification, mixing, wave filter and intermediate frequency amplify;
Signal S3 (n) of azimuth dimension digital received array antenna received obtains signal S5 (n) and also gives signal processor after orientation dimension word multichannel receiver process low noise amplification, mixing, wave filter and intermediate frequency amplify;
Step 3: signal S4 (n), the S5 (n) that receive are carried out A/D conversion, DDC, high-pass filtering, DBF, MTI/MTD, ask mould by signal processor, CFAR process, threshold judgement, target cohesion, send with signal S6 (n) after target pairing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109613508A (en) * | 2018-12-29 | 2019-04-12 | 森思泰克河北科技有限公司 | Forward direction target detection radar and method |
| CN110764059A (en) * | 2019-11-05 | 2020-02-07 | 中船重工（武汉）凌久电子有限责任公司 | Three-coordinate phased array radar technology for transmitting and receiving vertical beams |
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2015
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| EP1422533A1 (en) * | 2000-08-16 | 2004-05-26 | Raytheon Company | Radar receiver and radar system |
| CN103744080A (en) * | 2014-01-16 | 2014-04-23 | 中国科学院电子学研究所 | Satellite-borne multi-channel synthetic aperture radar imaging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613508A (en) * | 2018-12-29 | 2019-04-12 | 森思泰克河北科技有限公司 | Forward direction target detection radar and method |
| CN110764059A (en) * | 2019-11-05 | 2020-02-07 | 中船重工（武汉）凌久电子有限责任公司 | Three-coordinate phased array radar technology for transmitting and receiving vertical beams |
| CN110764059B (en) * | 2019-11-05 | 2021-09-17 | 中船重工（武汉）凌久电子有限责任公司 | Method for transmitting and receiving vertical beam three-coordinate phased array radar |
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