CN105223556B - L-type receives and dispatches array antenna front end and its signal processing method - Google Patents
L-type receives and dispatches array antenna front end and its signal processing method Download PDFInfo
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- CN105223556B CN105223556B CN201510572178.8A CN201510572178A CN105223556B CN 105223556 B CN105223556 B CN 105223556B CN 201510572178 A CN201510572178 A CN 201510572178A CN 105223556 B CN105223556 B CN 105223556B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
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- Radar, Positioning & Navigation (AREA)
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Abstract
The present invention relates to a kind of L-type transmitting-receiving array antenna front end and its signal processing method, front end is by transmitting antenna, emitter, pitching dimension word receiving array antenna, multichannel receiver is tieed up in pitching, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal processor composition, the output end of emitter connects the input of transmitting antenna, the input of the output termination pitching dimension multichannel receiver of pitching dimension word receiving array antenna, the input of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna, the input of the output end of pitching dimension 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, and in particular to a kind of in detection short range, high-speed moving object
The L-type array antenna and its signal processing technology of formation.
Background technology
With the development of automatic technology, people need to carry out target to the short range in some fields, high-speed moving object
Position, the accurate measurement of speed, the measuring system of early stage it is expected that for example infrared applied optics system, TV and laser etc. are combined
Measurement is realized, but optical system makes its application be very limited because climate, adverse circumstances influence are very big；Based on nothing
Measurement medium is wide, accuracy is high, corrosion-resistant, antijamming capability due to by non-cpntact measurement, showing for the measuring system of line electricity
Stronger and information transmission facilitates advantage, disclosure satisfy that the needs of application.
Short range, high-speed moving object Radio Measurement system, the development of its technical system is mainly by electronic device high speed
The influence of development, particularly signal processor are from DSP (Digital Signal Processing：Digital signal processor)
To FPGA development so that signal handling capacity greatly improves, and realizes DBF (Data beam Forming：Digital beam closes
Into) etc. technology, L-type transmitting-receiving array antenna front end and its signal processing method be exactly produced under such technical background.L-type is received
Array antenna front end and its signal processing method were sent out compared to former simple electromagnetic horn front end, has under continuous wave system and receives
The characteristics of isolation of system degree is high, detection accuracy is high is sent out, due to adopting compared with the phased array antenna front end of other single polarization modes
Having with 45 ° of inclined polarizations on target property strong adaptability, by ground clutter is influenceed the characteristics of small.
Based on short range, high-speed moving object Radio Measurement system, there is the requirement of high detection probability, low false-alarm probability.
Can automatic distinguishing come to, away from target, the vacation such as the stone that is splash for operation vehicle or moving vehicle, flying bird, personnel for walking about
Target does not respond.Because short range, high-speed target speed are high, therefore detection system must quickly and accurately measure the ginseng of target
Number, so as to improve the response time of system.Detection system should also have good Low emissivity characteristic, antijamming capability and electromagnetism simultaneous
Capacitive characteristics.Miniaturization, low energy consumption, the application demand of strong adaptive capacity to environment should be met for application of engineering project.
The content of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, present invention proposition is a kind of to be applied to what Short Range High Speed moving target detected
L-type receives and dispatches array antenna front end and its signal processing method.
Technical scheme
A kind of L-type transmitting-receiving array antenna front end, it is characterised in that received including transmitting antenna, emitter, pitching dimension word
At array antenna, pitching dimension multichannel receiver, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal
Manage device；The output end of emitter connects the input of transmitting antenna, the output termination pitching dimension of pitching dimension word receiving array antenna
The input of multichannel receiver, the input of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna
End, the input of the output end of pitching dimension multichannel receiver and the output termination signal processor of azimuth dimension multichannel receiver
End.
Described transmitting antenna, pitching dimension word receiving array antenna, azimuth dimension digital received array antenna are in structure
Reverse waveguide using 45 ° to realize, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna composition L-type knot
Structure, transceiver insulation baffle plate, transceiver insulation part are provided between L-type structure and transmitting antenna.
Described pitching dimension word receiving array antenna, azimuth dimension digital received array antenna by identical bore some ripples
Unit parallel arranged composition is led, each group of Wave guide unit includes antenna element, feeder unit forms.
Described pitching ties up multichannel receiver, azimuth dimension multichannel receiver by the identical some groups of signals being arranged in parallel
Process circuit is formed, and each group of signal processing circuit is made up of low-noise amplifier, frequency mixer, wave filter and intermediate frequency amplifier.
Described signal processor includes A/D sampling units, FPGA processor unit and high-speed interface unit.
The signal processing method that a kind of L-type transmitting-receiving array antenna front end described in use is realized, it is characterised in that step is such as
Under：
Step 1：Emitter gives signal S1 (n) to the radiation of transmitting antenna figuration；
Step 2：Pitching dimension word receiving array antenna receive signal S2 (n) through pitching dimension word multichannel receiver at
Signal S4 (n), which is obtained, after reason low noise amplification, mixing, wave filter and intermediate frequency amplification gives signal processor；
The signal S3 (n) of azimuth dimension digital received array antenna received handles low noise through orientation dimension word multichannel receiver
Signal S5 (n), which is obtained, after sound amplification, mixing, wave filter and intermediate frequency amplification also gives signal processor；
Step 3：Signal processor by the signal S4 (n) of reception, S5 (n) carry out A/D conversion, DDC, high-pass filtering, DBF,
Sent out after MTI/MTD, modulus, CFAR processing, threshold judgement, target cohesion, target pairing with signal S6 (n).
Beneficial effect
A kind of L-type transmitting-receiving array antenna front end proposed by the present invention and its signal processing method, according to high-speed mobile target
Characteristic, the inclined polarization mode using L-type transmitting-receiving 45 ° of torsion waveguides of array antenna is proposed, different target type can be taken into account to hanging down
Directly, the needs of horizontal polarized wave sensitive detection, a variety of polarizing target echoes are effectively increased, while it is miscellaneous effectively to suppress atural object
The interference of ripple, background clutter, it is very suitable for the measurement of short range, high-speed target.
Brief description of the drawings
Fig. 1 is the 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 units, 10- feeder units, 11- low-noise amplifiers, 12- frequency mixers, 13- wave filters,
14- intermediate frequency amplifiers, 15-A/D sampling units, 16-FPGA processor units, 17- high-speed interface units
Fig. 4 is the processing procedure that signal processor ties up array received signal and azimuth dimension array received signal to pitching
Embodiment
In conjunction with embodiment, accompanying drawing, the invention will be further described：
Emitter to carrier frequency, and gives linear frequency modulation continuous wave signal modulation in the form of S1 (n) after carrying out power amplification
Transmitting antenna, transmitting antenna carry out figuration radiation according to pitching dimension, the azimuth dimension coverage of design requirement.Pitching dimension word connects
The target echo signal S2 (n) for receiving array antenna received gives pitching dimension word multichannel receiver, and receiver carries out low first
Noise amplifies：So that microwave signal obtains certain gain amplification, and meet the input power of frequency mixer；Secondly frequency mixer is by microwave
Signal carries out being down-converted to intermediate-freuqncy signal with local oscillation signal (intermediate-freuqncy signal carrier frequency is determined according to signal bandwidth, local oscillator etc.)；
Then for the intermediate-freuqncy signal after mixing, the gating of certain passband is realized with wave filter；Last intermediate frequency amplifier ensures certain dynamic
The intermediate-freuqncy signal of state is all the time in the sample range of A/D samplers.Pitching dimension word multichannel receiver is by the intermediate frequency after processing
Signal S4 (n) gives signal processor；Similarly the signal S3 (n) of azimuth dimension digital received array antenna received is through orientation dimension word
Signal S5 (n), which is obtained, after multichannel receiver processing also gives signal processor.S4 (n), S5 (n) of the signal processor to feeding
Signal carries out A/D samplings, carries out DDC, high-pass filtering, DBF, MTI/MTD, modulus, the CFAR of pitching peacekeeping azimuth dimension respectively
The processing such as processing, threshold judgement, target cohesion, because pitching dimension multichannel reception signal send signal processor to carry out DBF processing
Synthesis wave beam it is narrow in pitching and azimuth dimension is wide, therefore target is high in the measurement accuracy that pitching is tieed up and the metrical information mould of azimuth dimension
Paste, its information include orientation, pitching, distance, speed and target strength etc..Similarly the azimuth dimension multichannel reception signal number of delivering letters is located
The synthesis wave beam of reason progress DBF processing is narrow in orientation and pitching dimension is wide, then the measurement accuracy in azimuth dimension target is high and pitching is tieed up
Information fuzzy, the information of target is also comprising parameters such as orientation, pitching, distance, speed and target strengths.Signal processor will be handled
Pitching dimension receiving channel, the information of azimuth dimension receiving channel carry out pairing processing afterwards, and obtain same target bearing, pitching, away from
From with speed accurate information, this is one of innovation of the present invention, and its main signal handling process is as shown in Figure 1.
The core of the present invention is that L-type receives and dispatches array antenna, including transmitting antenna, pitching dimension word receiving array day
Line, azimuth dimension digital received array antenna and transceiver insulation part.Its detailed construction is as shown in Figure 2：Mainly include transmitting antenna,
The shape assumption diagram of pitching dimension word receiving array antenna and azimuth dimension digital received array antenna (wherein pitching, orientation dimension
Word receiving array antenna is from L-shaped in shape)；Receive-transmit isolation index passes through in transmitting antenna and reception antenna (pitching, orientation
Dimension word reception antenna) increase transceiver insulation baffle plate and absorbing material to realize, wherein transceiver insulation height of baffle plate, width need
Emulated and determined by electromagnetic simulation software, in the absorbing material of transceiver insulation part installation respective antenna working frequency range, Ke Yigen
The adjustment of bonding area, position is carried out according to test result.
Transmitting antenna, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna radiating element use
45 ° of torsion waveguides, take into account needs of the different target type to vertical horizontal polarized wave sensitive detection, are effectively increased a variety of polarization
Target echo, while effectively suppress the influence of the clutters such as atural object；
Transmitted antednna beam requires progress Shape design, and its coverage includes pitching dimension, azimuth dimension digital received array
The range of receiving of antenna.
Pitching dimension word receiving array antenna and orientation are digital received array antenna unit number (N) by the wave beam designed
Width and measurement accuracy determine；
Transceiver insulation part and transmitting-receiving baffle plate need the isolation index for meeting receive-transmit system in 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, side
Position dimension word receiving array antenna includes antenna radiation unit and feeder unit, and antenna radiation unit realizes the reception for receiving echo
And amplification, feeder unit realize conversion of the microwave from waveguide transmission to micro-strip.It is more logical that multichannel receiver and azimuth dimension are tieed up in pitching
Road receiver is made up of LNA unit, frequency mixer, wave filter and intermediate frequency amplifier, realizes LNA, the mixing of microwave signal
(downconverting to intermediate-freuqncy signal), filtering and intermediate frequency amplification.Signal processor includes A/D sampling units, FPGA processor unit, high
Fast interface unit, realizes pitching dimension, azimuth dimension IF signal processing, and information is sent out through high-speed interface.
Fig. 4 be signal processor to the pitching dimension received, the processing procedure of azimuth dimension intermediate-freuqncy signal, by signal
A/D conversion, Digital Down Convert (DDC：Digital Down Converter), high-pass filtering, DBF, Fourier's change/Chip Z
Convert (FFT：Fast Fourier Transform/CZT：Chirp Z Transformation), Moveing target indication/moving-target
Detect (MTI：Moving Target Indicator/MTD：Moving Target Detection), modulus, CFAR processing
(CFAR：Constant False Alarm Rate), threshold judgement, target cohesion, target match somebody with somebody peer processes, by target information
Send out.
The signal transacting of L-type transmitting-receiving array antenna is substantially DBF processing to two one dimensional linear array, Processing Algorithm operand
It is small and low for hardware requirement, possess good real-time, be very suitable for short range, high-speed target detection system, it is real from engineering
Effect is good from the point of view of trampling checking.
The present invention wants to realize miniaturization and low-cost design in orientation, pitching dimension word multichannel receiver simultaneously
Integrated thinking in the case that the size asked is small, passage is more, multipath reception channel chip group is sealed using LTCC integrated techniques
It is fitted together, the combination of multichannel multi pack is formed, to mitigate weight, compression volume；Secondly by emitter, frequency synthesis in front end
Device, electric power network etc. carry out integrated design, realize that module is directly docked with comprehensive blindmate substantially, form no lead battle array
Face, front annexation can be simplified while front integrated level is improved, improve reliability.
Claims (2)
1. a kind of L-type transmitting-receiving array antenna front end, it is characterised in that receive battle array including transmitting antenna, emitter, pitching dimension word
Array antenna, pitching dimension multichannel receiver, azimuth dimension digital received array antenna, azimuth dimension multichannel receiver and signal transacting
Device；The output end of emitter connects the input of transmitting antenna, and the output termination pitching dimension of pitching dimension word receiving array antenna is more
The input of channel receiver, the input of the output termination azimuth dimension multichannel receiver of azimuth dimension digital received array antenna
End, the input of the output end of pitching dimension multichannel receiver and the output termination signal processor of azimuth dimension multichannel receiver
End；
Described transmitting antenna, pitching dimension word receiving array antenna, azimuth dimension digital received array antenna are adopted in structure
Waveguide is reversed with 45 ° to realize, pitching dimension word receiving array antenna and azimuth dimension digital received array antenna composition L-type structure, L
Transceiver insulation baffle plate, transceiver insulation part are provided between type structure and transmitting antenna；
Described pitching dimension word receiving array antenna, azimuth dimension digital received array antenna by identical bore some waveguide lists
First parallel arranged composition, each group of Wave guide unit includes antenna element (9), feeder unit (10) forms；
Described pitching ties up multichannel receiver, azimuth dimension multichannel receiver by the identical some groups of signal transactings being arranged in parallel
Circuit is formed, and each group of signal processing circuit is amplified by low-noise amplifier (11), frequency mixer (12), wave filter (13) and intermediate frequency
Device (14) forms；
Described signal processor includes A/D sampling units, FPGA processor unit and high-speed interface unit.
2. a kind of L-type using described in claim 1 receives and dispatches the signal processing method that array antenna front end is realized, it is characterised in that
Step is as follows：
Step 1：Emitter gives signal S1 (n) to the radiation of transmitting antenna figuration；
Step 2：The signal S2 (n) that pitching dimension word receiving array antenna receives handles low through pitching dimension word multichannel receiver
Signal S4 (n), which is obtained, after noise amplification, mixing, wave filter and intermediate frequency amplification gives signal processor；
The signal S3 (n) of azimuth dimension digital received array antenna received is put through orientation dimension word multichannel receiver processing low noise
Greatly, obtain signal S5 (n) after mixing, wave filter and intermediate frequency amplification and also give signal processor；
Step 3：The signal S4 (n) of reception, S5 (n) are carried out A/D conversion, DDC, high-pass filtering, DBF, MTI/ by signal processor
Sent out after MTD, modulus, CFAR processing, threshold judgement, target cohesion, target pairing with signal S6 (n).
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| CN201510572178.8A CN105223556B (en) | 2015-09-10 | 2015-09-10 | L-type receives and dispatches array antenna front end and its signal processing method |
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| CN105223556B true CN105223556B (en) | 2017-12-12 |
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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 |
| 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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| 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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2015
- 2015-09-10 CN CN201510572178.8A patent/CN105223556B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (2)
| Title |
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| 倍频程圆极化喇叭天线的研究;魏振华;《中国优秀硕士学位论文全文数据库 信息科技辑》;20100515;第54页 * |
| 某雷达数字波束形成***的设计与实现;王静;《中国优秀硕士学位论文全文数据库 信息科技辑》;20090715;摘要、第1、13页 * |
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