CN105346564A - Detecting system for perimeter intruders of parts along line of high-speed rail and detecting method of detecting system - Google Patents
Detecting system for perimeter intruders of parts along line of high-speed rail and detecting method of detecting system Download PDFInfo
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- CN105346564A CN105346564A CN201510819749.3A CN201510819749A CN105346564A CN 105346564 A CN105346564 A CN 105346564A CN 201510819749 A CN201510819749 A CN 201510819749A CN 105346564 A CN105346564 A CN 105346564A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning, or like safety means along the route or between vehicles or vehicle trains
Abstract
The invention discloses a detecting system for perimeter intruders of parts along the line of a high-speed rail and a detecting method of the detecting system. The detecting system for the perimeter intruders of the parts along the line of the high-speed rail comprises a processing unit, an intermediate frequency unit, a receiving-transmitting unit and an antenna unit; the processing unit receives a remote control signal and transmits the remote control signal to the intermediate frequency unit, and the intermediate frequency unit generates an intermediate frequency drive signal and transmits the intermediate frequency drive signal to the receiving-transmitting unit; the signal is amplified through the receiving-transmitting unit and transmitted to the antenna unit to be transmitted, the reflected signal is received through the antenna unit after being reflected by a target, and the receiving-transmitting unit conducts frequency mixing; and the intermediate frequency unit conducts sampling and FFT conversion on the signal, and the processing unit processes the signal to obtain the final judgment result. On the premise that the detection probability is guaranteed, the false alarm rate is greatly reduced. The false alarm rate can be reduced to one hundred thousandths by a radar through systematic design, accumulation detection and the constant false alarm rate algorithm on the premise that the detection probability is guaranteed.
Description
Technical field
The present invention relates to radar sensing system and method for inspection, be specifically related to a kind of checking system for high ferro circumference invader along the line and method of inspection thereof.
Background technology
Along with China " band one tunnel " implementation, the establishment of the sub-investment bank, government will inevitably guide large quantities of fund input in related industry.Wherein, high ferro industry must become the leading industry of next ripple national development.At this wherein, the high ferro construction project that country is leading must be the focus in focus.
Should see, in newly a collection of high ferro construction project, passing through Midwest, transboundary Euro-Asia Continental Bridge, connecting the high ferro project on the ground such as the Central Asia/India/Russia/Ukraine is emphasis.These high ferro construction projects are all faced with a common problem: security protection problem.In the region of these high ferro processes, great majority are all international and domestic focus areas.Such as, Lan Xin line (Lanzhou-Urumchi) will cross over hot-zone, Xinjiang.These regions are faced with that very severe anti-terrorism is anti-quick-fried, the problem of security protection stability maintenance.Therefore, carrying out the security protection protection of these high ferro projects, guarantee the safe operation of high ferro, is that this takes turns the most important thing of high ferro construction.
Existing high ferro security protection measure mainly comprises three kinds:
1. fiber-optic vibration;
2. fence;
3. video monitoring.
Generally speaking, complete high ferro safety-protection system is triplicity, has complementary advantages.But there are the following problems in existing high ferro security protection measure:
1. rate of false alarm is high.Fiber-optic vibration often can be reported by mistake by factors such as strong wind.From existing fiber-optic vibration protection experience, rate of false alarm is very high.This problem is particularly outstanding at Lan Xin line.The most area that Lan Xin line passes through is all high wind areas, and wind-force is very high.In fact, high ferro is run for rate of false alarm close to zero tolerance.Because once after wrong report, can affect the operation of whole railway, spread area is extremely wide.
2. differentiate rate variance.The segmentation defence often of existing security and guard technology.Can only report to appear at which section (being 200 meters a section at present) for threat region, and accurately can not report the position threatening and occur.This is totally unfavorable for threatening the process after occurring.
3. defend region little.Only have defense function in the region being laid with these two kinds of equipment for fiber-optic vibration and fence, and video monitoring exist visual field little, be subject to the factors such as weather interference.Therefore, the defence region of current security protection measure is very narrow and small.Expand defence region, its construction cost can be that geometric series increases.
4. cannot accomplish that early warning type is defended.Because current security and guard technology cannot accomplish large-scale defence, be therefore, in threat, alarm occurs substantially, and cannot early warning before threat occurs.
5. cannot accomplish to defend air defence.In the past, main destructive activity crosses the guardrail enforcement of high ferro both sides by people.But along with the development of commercial unmanned plane, increasing destructive activity will carry out throwing type by commercial unmanned plane or prominent anti-formula is destroyed.
6. cost is high.Current security protection measure cost is roughly equal to 700,000 RMB/Km.Wherein equipment cost is about 40-50 ten thousand RMB/Km.。
Summary of the invention
For the deficiencies in the prior art, the invention discloses a kind of checking system for high ferro circumference invader along the line and method of inspection thereof.
Technical scheme of the present invention is as follows:
For a checking system for high ferro circumference invader along the line, comprise processing unit, intermediate frequency unit, Transmit-Receive Unit and antenna element; Described processing unit comprises the first transmission channel and the first receiving cable; Described intermediate frequency unit comprises the second transmission channel and the second receiving cable; Described intermediate frequency unit comprises the 3rd transmission channel and the 3rd receiving cable, and described antenna element comprises the 4th transmission channel and the 4th receiving cable;
Described first transmission channel comprises main control module, and described main control module receives remote control signal, and is transferred to the second transmission channel;
Described second transmission channel comprises master control time block and DDS module; Described master control time block is connected with described main control module, and two mouths of master control time block connect DDS module and the second receiving cable;
Described 3rd transmission channel comprises frequency multiplier chain module, coupling module and amplifier module; The input end of described frequency multiplier chain module is connected with described DDS module, mouth butt coupling module, and two mouths of coupling module connect amplifier module and the 3rd receiving cable respectively;
Described 4th transmission channel is emitting antenna, is connected with the mouth of described amplifier module; Described 4th receiving cable be receiving wire, mouth connect the 3rd receiving cable;
Described 3rd receiving cable comprises LNA mixer module and AFC filter and amplification module; Described LNA mixer module is connected with described receiving wire, and the mouth of LNA mixer module connects AFC filter and amplification module;
Described second receiving cable comprises AD sampling module, FFT module and data packing block; Described AD sampling module connects AFC filter and amplification module, and the mouth of AD sampling module connects the input end of FFT module; Two input ends of data packing block connect the mouth of FFT module and the mouth of master control time block respectively, and the mouth of data packing block connects described first receiving cable;
Described first receiving cable comprises MTD module, clutter map processing module, object module and area calculation module; Described MTD module, clutter map processing module, object module are connected successively with area calculation module.
Use above-mentioned system to carry out a method for high ferro circumference invader detection along the line, comprise the following steps:
A, described main control module receive remote control signal, and are transferred to master control time block;
B, described master control time block receive the signal of described main control module, produce the frame signal needed for radar work and PRF signal, and are transferred to DDS module; Described master control time block produces timing wave simultaneously, is transferred to the second receiving cable;
C, described DDS module produce intermediate frequency pumping signal and are transferred to frequency multiplier chain module;
D, described frequency multiplier chain module receive and process intermediate frequency pumping signal, produce X-band radiofrequency signal;
F, described coupling module filter out the main radiofrequency signal in X-band radiofrequency signal, and transfer to amplifier module; And produce transmitted reference signal, transfer to the 3rd receiving cable;
G, described amplifier module are by the power gain of main radiofrequency signal;
The signal that h, described emitting antenna receiving amplifier module are transmitted by it to space fixed angle radiation;
I, described receiving wire receiving target echoed signal be transferred to LNA mixer module;
Received target echo signal and described transmitted reference signal are carried out mixing by j, described LNA mixer module, produce intermediate-freuqncy signal;
K, described AFC filter and amplification module are transferred to AD sampling module after the large-signal near the zero-frequency in intermediate-freuqncy signal being suppressed;
L, described AD sampling module by AFC filter and amplification module transmit the signal come and carry out sampling and become digital signal, and be transferred to FFT module;
M, described FFT module are carried out Fast Fourier Transform (FFT) to digital signal, and are transferred to described data packing block;
N, described data packing block, in conjunction with timing wave, are packed to the digital signal after Fast Fourier Transform (FFT), and are transferred to MTD module;
O, described MTD module, clutter map processing module, object module and area calculation module process the signal after packing successively, obtain the latitude coordinates of target.
Its further technical scheme is: described FFT module comprises distance to FFT module and orientation to FFT module; Described object module comprises module of target detection and target decision module;
In described step m and step n:
Distance to FFT module and orientation to FFT module to digital signal carry out successively distance to Fast Fourier Transform (FFT) and orientation to Fast Fourier Transform (FFT), obtain distance-Doppler two-dimensional spectrum;
Adjust the distance-Doppler's two-dimensional spectrum carries out asking mould, and the value after mould will be asked to send into clutter map processing module, upgrade clutter map; Described clutter map is that each resolution cell on Doppler-distance two-dimensional spectrum demarcates a clutter amplitude value;
Above-mentioned asking in the feeding of the value after mould module of target detection is carried out target detect, module of target detection calls the clutter map that clutter map processing module exports simultaneously, and the threshold value of each resolution cell is then determined by the range value of each corresponding unit on this clutter map;
The output signal of module of target detection is transferred to target decision module, when have in a certain rang ring threaten target time, echo amplitude will strong than when not threatening target, and judgement has target thus.
Advantageous Effects of the present invention is:
The present invention adopts radio detection technology, and namely radar carries out the defence of high ferro circumference, is a kind of brand-new thinking, can well make up the series of problems that existing security protection system exists, and have the feature of oneself.
1., under ensureing the prerequisite of detection probability, make rate of false alarm significantly low.Radar by system, accumulation detection and CFAR algorithm, under the prerequisite ensureing detection probability, rate of false alarm can be reduced to 100,000/ level.
2. resolution can reach within ten meters.Adopt linear frequency modulation radar that range resolution can be made to reach within ten meters.Detected by networking simultaneously, azimuth resolution can be increased within ten meters.
3. comprehensive defence.The beam width of radar is generally at about 4 °.This beam width radiation direction space, under certain distance prerequisite, detects without dead angle in the scope that can reach hundreds of meters, periphery.Detected by networking, the blind area of single radar can be made up, thus defence region can be made to be extended to 100 meters.
4. early warning type defence can be carried out.Because radar defence region is large, enter defence region but the suspicious object also not implementing destructive activity therefore, it is possible to detect.Like this, security protection personnel just can take action before destruction is implemented, and destructive activity were strangled among rudiment.
5. can accomplish to defend air defence.By designing the luffing angle of radar, radar can detect the target of airflight.
6. cost is low.Because radar realizes detecting by the mode of radiate radio waves.Judge according to the ratio of " defence region/price ", Radar Technology has very huge cost advantage.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is system schematic of the present invention.
Fig. 3 is complete machine structure schematic diagram of the present invention.
Fig. 4 is complete machine structure front elevation of the present invention.
Fig. 5 is complete machine structure lateral plan of the present invention.
Fig. 6 is the theory of constitution schematic diagram of Transmit-Receive Unit.
Fig. 7 is the theory of constitution schematic diagram of intermediate frequency unit.
Fig. 8 is the diagram of circuit of meticulous Clutter-map Technology.
Fig. 9 is the schematic diagram of target detect in meticulous Clutter-map Technology.
Detailed description of the invention
Fig. 1 is schematic diagram of the present invention.As shown in Figure 1, system of the present invention take radar as the monitored control system of core, and multiple radar can be used to carry out networking, relies on the relative position relation of radar, realizes complementary blind area and networking detection.
The function that system of the present invention can realize is:
1, by radar, adopt linear frequency modulation continuous wave range measurement principle, the target in radar aerial main lobe beam region is monitored, obtained the range information of target by target echo.
2, adopt the ground clutter such as rail, roadbed that MTD, the filtering of meticulous clutter map cancellation techniques are fixing, retrieve tangential motion target simultaneously.
3, adopt the identification to long distance moving target, remove the detection of train target.
4, adopt multi-radar network detection, realize the covering to radar closely physics blind area.
Fig. 2 is system schematic of the present invention.
The present invention includes processing unit, intermediate frequency unit, Transmit-Receive Unit and antenna element.Processing unit comprises the first transmission channel and the first receiving cable; Intermediate frequency unit comprises the second transmission channel and the second receiving cable; Intermediate frequency unit comprises the 3rd transmission channel and the 3rd receiving cable, and antenna element comprises the 4th transmission channel and the 4th receiving cable.
First transmission channel comprises main control module, and main control module receives remote control signal, and is transferred to the second transmission channel;
Second transmission channel comprises master control time block and DDS module; Master control time block is connected with main control module, and two mouths connect DDS module and the second receiving cable respectively;
3rd transmission channel comprises frequency multiplier chain module, coupling module and amplifier module; The input end of frequency multiplier chain module is connected with DDS module, mouth butt coupling module, and two mouths of coupling module connect amplifier module and the 3rd receiving cable respectively;
4th transmission channel is emitting antenna, is connected with the mouth of amplifier module; 4th receiving cable be receiving wire, mouth connect the 3rd receiving cable;
3rd receiving cable comprises LNA mixer module and AFC filter and amplification module; LNA mixer module is connected with receiving wire, and mouth connects AFC filter and amplification module;
Second receiving cable comprises AD sampling module, FFT module and data packing block; AD sampling module connects AFC filter and amplification module, and mouth connects the input end of FFT module; Two input ends of data packing block connect the mouth of FFT module and the mouth of master control time block, and data packing block, in conjunction with timing wave, is packed to received signal, and the input end of data packing block connects described first receiving cable;
First receiving cable comprises MTD module, clutter map processing module, object module and area calculation module; Described MTD module, clutter map processing module, object module are connected successively with area calculation module.
In the present embodiment, the hardware forming present system is as shown in the table:
The list of system hardware composition is as shown in table 1:
The list of table 1 system hardware composition
Specifically details are as follows:
1, system interface.
Comprise high ferro monitored control system interface and other interfaces.
System of the present invention needs to consider the docking concept with railway monitoring system.According to high ferro construction criteria, general employing cable network or wireless (GMS-R) network transmission protocol.When system, a fixing Ethernet interface can be designed, to adapt to that there is the communication under cable network condition.Design a wireless GMS simultaneously and match part, when not having under cable network condition, increasing this apolegamy part, making system have wireless transmission capability.Other interfaces comprise ATE interface, data logger interface etc., can design as required.
2, system architecture.
Fig. 3 is complete machine structure schematic diagram of the present invention.Fig. 4 is complete machine structure front elevation of the present invention.Fig. 5 is complete machine structure lateral plan of the present invention.In the present embodiment, visible emission antenna and receiving wire in radar complete machine structure length × wide × high=600 × 600 × 800, Fig. 3, Fig. 4 and Fig. 5.
3, antenna element.The function of antenna element is to space fixed angle radiation and the rf echo signal received from space fixed angle by radiofrequency signal.The technical requirements of antenna element is as follows:
1) frequency of operation: 8.9GHz ~ 10.1GHz;
2) aerial gain: be better than 27.2dBc;
3) beam width: 6 ° ± 1 °;
4) minor level: be better than-25dBc;
5) standing wave: <1.5;
6) diameter: 0.3m;
7) instant bandwidth: >=150MHz;
In the present embodiment, 0.3 meter of plate-shaped parabolic antenna that Xi'an perseverance reaches is selected.Its product index is as shown in table 2:
The parameter declaration of antenna used in table 2 the present embodiment
| Model | HD-100RA300I |
| Diameter D (mm) | 0.3 |
| Frequency limit (GHz) | 8.20-12.40 |
| Bandwidth | 10 |
| Gain (dB) | 27.3 |
| Standing wave (Max.) | 1.5 |
| Beam width (°) | 6 |
| Joint categories | FBP-100 |
4, Transmit-Receive Unit.Intermediate frequency pumping signal is passed through frequency multiplier chain module frequency multiplication to X-band by the 3rd transmission channel of Transmit-Receive Unit, and amplifies output by amplifier module; Coupling module produces that riches all the way penetrates reference signal transmission to the 3rd receiving cable of Transmit-Receive Unit.The target echo received is produced intermediate-freuqncy signal through LNA mixer module and transmitted reference signal mixing by the 3rd receiving cable, and Frequency mixing processing is mainly based on dechirp mixing algorithm; Intermediate-freuqncy signal exports after AFC filter and amplification resume module.
The technical requirements of Transmit-Receive Unit is as follows:
Transmitter module:
1) service band: 8.9GHz ~ 10.1GHz;
2) center frequency point: (only frequency-selecting)
No. 1 point: 9GHz;
No. 2 point: 9.2GHz;
No. 3 point: 9.4GHz;
No. 4 point: 9.6GHz;
No. 5 point: 9.8GHz;
No. 6 point: 10GHz.
3) emissive power: 15dBm;
4) make an uproar mutually :-80dBc/Hz1kHz;
5) spuious: band stray-60dBc;
6) instant bandwidth: 150MHz.
Receiver module:
1) gain: 60dB;
2) receiver bandwidth: 8MHz;
3) noise factor: be better than 3.5dB;
4) AFC suppresses:
Turn-on frequency: 100kHz;
Cut-off region rejection ability: 55dB1kHz, 16dB10kHz.
5) there is limited amplitude protection function;
6) EF power :-58dBm ~ 19dBm is exported.
Fig. 6 is the theory of constitution schematic diagram of Transmit-Receive Unit.
Transmit-Receive Unit forms by as the frequency synthesizer of sending module and receiver module, and wherein frequency synthesizer can realize the function of the modules such as temperature compensating crystal oscillator, DDS, waveform generation, up-conversion and frequency multiplier chain; Receiver module can realize the function of the modules such as frequency mixer, filtering, intermediate frequency amplifier chain.In the present embodiment, consider the needs saving circuit and Waveform Control, DDS module has been placed on the board of intermediate frequency unit.
5, intermediate frequency unit.
The master control time block of intermediate frequency unit receives the signal of main control module, produces the necessary frame signal of radar work and PRF signal, and control DDS module; DDS module produces intermediate frequency pumping signal.Master control time block also produces timing waveform signal.AD sampling module by AFC filter and amplification module transmit the signal come and carry out sampling and become digital signal, and be transferred to FFT module; Digital signal is carried out Fast Fourier Transform (FFT) by FFT module, and is transferred to data packing block, packs in conjunction with timing waveform signal;
The technical requirements of intermediate frequency unit is:
Intermediate frequency pumping signal:
1) power :-2dBm ± 2dBm;
2) make an uproar mutually: be better than-110dBc/Hz1kHz;
3) spuious: to be better than-60dBc.
Timing waveform signal
1) kind: a kind;
2)PRI：1061us；
3) frequency sweep time: 1060us;
4) flyback time: 1us;
5) the initial frequency of frequency sweep:
6) frequency sweep stops frequency:
7) PRF number in frame: 256/frame.
AD sampling module:
1) sampling frequency: 16MSPS;
2) sample bit wide: 16bit;
3) SNR: be better than 77dBc.
FFT module:
1) FFT counts: 8192 points;
2) pretreatment sampling frequency: 8MSPS;
3) data type: 32 floating numbers;
4) continuous-flow type uninterruptedly processes;
With the digital interface of processing unit:
1) handler optical fiber:
Multimode optical fibers, 1X;
Agreement: Aurora;
Speed: 1.25GSPS.
2) optical fiber is recorded:
Multimode optical fibers, 1X;
Agreement: Aurora;
Speed: 1.25GSPS.
Fig. 7 is the hardware theory of constitution schematic diagram of intermediate frequency unit.
Intermediate frequency unit forms primarily of AD9266FMC daughter board, AD9910FMC daughter board and Virtex-585TFPGA motherboard.AD9266FMC daughter board achieves the function of AD sampling module, sends into Virtex-585TFPGA motherboard after received signal is carried out digital sample.Virtex-585TFPGA motherboard achieves the function of FFT module and data packing block, carries out quadrature demodulation, distance after Fast Fourier Transform (FFT) and data packing, be sent to processing unit by optical fiber to echo.Original echoed signals is transmitted through the fiber to data logger simultaneously.AD9910FMC daughter board exports transmitting excitation waveform by the control of Virtex-585TFPGA motherboard.Virtex-585TFPGA motherboard completes the control to Transmit-Receive Unit by series of discrete amount simultaneously.Virtex-585TFPGA motherboard also by SPF optical-fiber connection data recording instrument, carries out record to related data.
6, processing unit.
Processing unit digital signal processes, and extracts target information; And radar system is controlled; Complete the information interaction with superior system simultaneously; Complete the information interaction with collaborative acquisition radar.
The technical requirements of processing unit:
1) data throughout: 31MB/s;
2) the main algorithm that can complete:
MTD moving target detect; Clutter map real-time update and unit thresholding calculate; Target detect; Target decision; Coordinate transform.
3) clutter improvement factor: be better than 30dB.
The digital interface of processing unit:
1) intermediate frequency optical fiber:
Multimode optical fibers, 1X; Agreement: Aurora; Speed: 1.25GSPS.
2) ethernet: 1000M, TCP/IP;
3) wifi:2.5GHz standard;
4) custom interface such as USB, UART.
The hardware composition of processing unit and principle:
Processing unit is made up of PCIe sonet card, Geforece video card and fan-free industrial computer.Operating system adopts linux operating system.
Fan-free industrial computer:
1) model is for grinding magnificent ARK-3440A2:
I7 fan-free built-in industrial control machine; Support two PCIe passage; Multiple interfaces; Meet IP40 degree of protection.
2) Geforce video card
Asus GTX650TI-DF-1GD5 video card, has and tall and handsomely reaches GTX650 core GPU chip.
3) PCIe sonet card
Adopt the sonet card developed in COMPUTER REAL TIME PROCESSING SYSTEM.
The invention also discloses a kind of method using system as above to carry out high ferro circumference invader detection along the line, comprise the following steps:
A, main control module receive remote control signal, and are transferred to master control time block;
B, master control time block receive the signal of main control module, and the generation necessary frame signal of radar work and PRF Signal transmissions are to DDS module; Master control time block also sends timing wave, is transferred to data packing block.
C, DDS module produces intermediate frequency pumping signal and is transferred to frequency multiplier chain module;
D, frequency multiplier chain module receive and process intermediate frequency pumping signal, produce X-band radiofrequency signal;
F, coupling module filter out the main radiofrequency signal in X-band radiofrequency signal, and transfer to amplifier module; And produce transmitted reference signal, transmit to LNA mixer module;
G, amplifier module are by the power gain of main radiofrequency signal;
The signal that h, emitting antenna receiving amplifier module are transmitted by it to space fixed angle radiation;
I, receiving wire receiving target echoed signal be transferred to LNA mixer module;
Received target echo signal and reference signal are carried out mixing by j, LNA mixer module, produce intermediate-freuqncy signal;
K, AFC filter and amplification module is transferred to AD sampling module after the large-signal near the zero-frequency in intermediate-freuqncy signal being suppressed;
L, AD sampling module by AFC filter and amplification module transmit the signal come and carry out sampling and become digital signal, and be transferred to FFT module;
M, FFT module carries out Fast Fourier Transform (FFT) to digital signal, and is transferred to data packing block;
N, data packing block, in conjunction with timing wave, are packed to the digital signal after Fast Fourier Transform (FFT), and are transferred to MTD module;
O, MTD module, clutter map processing module, object module and area calculation module process the signal after packing successively, obtain the latitude coordinates of target.
The Processing Algorithm flow process detected for the slower-velocity target of low grazing angle is:
Distance is carried out to FFT and orientation to FFT to digital echo signal, obtains distance-Doppler two-dimensional spectrum.
Mould is asked to two-dimensional spectrum.By asking the value after mould to send into clutter map generation module, upgrade clutter map.
Meanwhile, modulus value is sent in module of target detection carry out target detect.Now, the threshold value of each unit is determined by clutter map completely.
Because target probably carries out tangential motion, therefore, inevitably require that radar system can carry out target detect in clutter district.Target detect in clutter district is different from traditional CFAR and detects.Due to, each range gate can have the object returns such as rail, sleeper, underground metalliferous target.And this kind of echo all possessed the ability of CFAR thresholding.Therefore CFAR is adopted will inevitably to occur a large amount of false-alarm.For this reason, this programme adopts " meticulous clutter map " technology, and Fig. 8 is the diagram of circuit of meticulous Clutter-map Technology.
In " meticulous clutter map " technology, FFT module comprises distance to FFT module and orientation to FFT module; Object module comprises module of target detection and target decision module;
In above-mentioned steps m and step n:
Distance to FFT module and orientation to FFT module to digital signal carry out successively distance to Fast Fourier Transform (FFT) and orientation to Fast Fourier Transform (FFT), obtain distance-Doppler two-dimensional spectrum;
Adjust the distance-Doppler's two-dimensional spectrum carries out asking mould, and the value after mould will be asked to send into clutter map processing module, upgrade clutter map; Clutter map is that each resolution cell on Doppler-distance two-dimensional spectrum demarcates a clutter amplitude value;
Above-mentioned asking in the feeding of the value after mould module of target detection is carried out target detect, module of target detection calls the clutter map that clutter map processing module exports simultaneously, the threshold value of each resolution cell is then determined by the range value of each corresponding unit on this clutter map, and Fig. 9 is the schematic diagram of target detect in meticulous Clutter-map Technology.
The output signal of module of target detection is transferred to target decision module, when have in a certain rang ring threaten target time, echo amplitude will strong than when not threatening target, and judgement has target thus.
Meticulous Clutter-map Technology can carry out target detect by actv. in clutter district.
When adjudicating the target detected, judgment condition adjusts according to actual conditions.Basic judgment condition is as follows:
A) continuous possession is greater than the target deletion of 100 range gate;
B) scattered target is deleted.
Afterwards the target information by target decision is sent in area calculation module, calculate the region that target occurs.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive without departing from the spirit and concept in the present invention or associate, all should think and be included within protection scope of the present invention.
Claims (3)
1. for a checking system for high ferro circumference invader along the line, it is characterized in that, comprise processing unit, intermediate frequency unit, Transmit-Receive Unit and antenna element; Described processing unit comprises the first transmission channel and the first receiving cable; Described intermediate frequency unit comprises the second transmission channel and the second receiving cable; Described intermediate frequency unit comprises the 3rd transmission channel and the 3rd receiving cable, and described antenna element comprises the 4th transmission channel and the 4th receiving cable;
Described first transmission channel comprises main control module, and described main control module receives remote control signal, and is transferred to the second transmission channel;
Described second transmission channel comprises master control time block and DDS module; Described master control time block is connected with described main control module, and two mouths of master control time block connect DDS module and the second receiving cable;
Described 3rd transmission channel comprises frequency multiplier chain module, coupling module and amplifier module; The input end of described frequency multiplier chain module is connected with described DDS module, mouth butt coupling module, and two mouths of coupling module connect amplifier module and the 3rd receiving cable respectively;
Described 4th transmission channel is emitting antenna, is connected with the mouth of described amplifier module; Described 4th receiving cable be receiving wire, mouth connect the 3rd receiving cable;
Described 3rd receiving cable comprises LNA mixer module and AFC filter and amplification module; Described LNA mixer module is connected with described receiving wire, and the mouth of LNA mixer module connects AFC filter and amplification module;
Described second receiving cable comprises AD sampling module, FFT module and data packing block; Described AD sampling module connects AFC filter and amplification module, and the mouth of AD sampling module connects the input end of FFT module; Two input ends of data packing block connect the mouth of FFT module and the mouth of master control time block respectively, and the mouth of data packing block connects described first receiving cable;
Described first receiving cable comprises MTD module, clutter map processing module, object module and area calculation module; Described MTD module, clutter map processing module, object module are connected successively with area calculation module.
2. use the system as claimed in claim 1 to carry out a method for high ferro circumference invader detection along the line, it is characterized in that, comprise the following steps:
A, described main control module receive remote control signal, and are transferred to master control time block;
B, described master control time block receive the signal of described main control module, produce the frame signal needed for radar work and PRF signal, and are transferred to DDS module; Described master control time block produces timing wave simultaneously, is transferred to the second receiving cable;
C, described DDS module produce intermediate frequency pumping signal and are transferred to frequency multiplier chain module;
D, described frequency multiplier chain module receive and process intermediate frequency pumping signal, produce X-band radiofrequency signal;
F, described coupling module filter out the main radiofrequency signal in X-band radiofrequency signal, and transfer to amplifier module; And produce transmitted reference signal, transfer to the 3rd receiving cable;
G, described amplifier module are by the power gain of main radiofrequency signal;
The signal that h, described emitting antenna receiving amplifier module are transmitted by it to space fixed angle radiation;
I, described receiving wire receiving target echoed signal be transferred to LNA mixer module;
Received target echo signal and described transmitted reference signal are carried out mixing by j, described LNA mixer module, produce intermediate-freuqncy signal;
K, described AFC filter and amplification module are transferred to AD sampling module after the large-signal near the zero-frequency in intermediate-freuqncy signal being suppressed;
L, described AD sampling module by AFC filter and amplification module transmit the signal come and carry out sampling and become digital signal, and be transferred to FFT module;
M, described FFT module are carried out Fast Fourier Transform (FFT) to digital signal, and are transferred to described data packing block;
N, described data packing block, in conjunction with timing wave, are packed to the digital signal after Fast Fourier Transform (FFT), and are transferred to MTD module;
O, described MTD module, clutter map processing module, object module and area calculation module process the signal after packing successively, obtain the latitude coordinates of target.
3. the method that detects of high ferro as claimed in claim 2 circumference invader along the line, is characterized in that: described FFT module comprises distance to FFT module and orientation to FFT module; Described object module comprises module of target detection and target decision module;
In described step m and step n:
Distance to FFT module and orientation to FFT module to digital signal carry out successively distance to Fast Fourier Transform (FFT) and orientation to Fast Fourier Transform (FFT), obtain distance-Doppler two-dimensional spectrum;
Adjust the distance-Doppler's two-dimensional spectrum carries out asking mould, and the value after mould will be asked to send into clutter map processing module, upgrade clutter map; Described clutter map is that each resolution cell on Doppler-distance two-dimensional spectrum demarcates a clutter amplitude value;
Above-mentioned asking in the feeding of the value after mould module of target detection is carried out target detect, module of target detection calls the clutter map that clutter map processing module exports simultaneously, and the threshold value of each resolution cell is then determined by the range value of each corresponding unit on this clutter map;
The output signal of module of target detection is transferred to target decision module, when have in a certain rang ring threaten target time, echo amplitude will strong than when not threatening target, and judgement has target thus.
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