CN102508305A - Ultra wide band radar life detection system and method - Google Patents
Ultra wide band radar life detection system and method Download PDFInfo
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- CN102508305A CN102508305A CN2011102909265A CN201110290926A CN102508305A CN 102508305 A CN102508305 A CN 102508305A CN 2011102909265 A CN2011102909265 A CN 2011102909265A CN 201110290926 A CN201110290926 A CN 201110290926A CN 102508305 A CN102508305 A CN 102508305A
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Abstract
The invention discloses an ultra wide band radar life detection system and an ultra wide band radar life detection method. The ultra wide band radar life detection system comprises a radar host and a control terminal. The radar host comprises a transmitting antenna, a receiving antenna, a transmitter, a receiver, a main control unit and a communication unit. The control terminal transmits a detection command; the detection command enters the main control system through the communication unit; the main control system triggers the transmitter to generate an ultra wide band narrow pulse; then the ultra wide band narrow pulse is radiated to an observation region by the transmitting antenna; the receiving antenna receives a pulse echo; the pulse echo is transmitted into the receiver to be sampled; data obtained after sampling is transmitted into the main control system to be subjected to clutter rejection, detection and judgment; and the communication unit transmits a processing result of the main control system into the control terminal to display the processing result. Compared with a conventional life detector, the ultra wide band radar life detection system has the advantages that the control terminal can remotely control the radar host to work according to the required mode; and the ultra wide band radar life detection system not only has strong penetrating power, but also has high reliability and high detection accuracy.
Description
Technical field
The present invention relates to life and search and rescue the detecting devices field, relate in particular to a kind of ULTRA-WIDEBAND RADAR formula life-detection system and method.
Background technology
As everyone knows, in scenes of the accident such as earthquake, fire, building collapses, for life entity survey fast and accurately and locate be realize to the timely and effective relief of existence personnel basic guarantee.Life detection technology through walls can detect the target of being blocked by the various disorders thing; Especially life entity target and various characteristic thereof; Can be widely used in fields such as disaster assistance, anti-terrorism, public security, fire-fighting, medical treatment and military surveillance; Detection Techniques through walls are varied, can be divided into two kinds of active and passive types according to mode of operation, can be divided into ultrasound wave, ultra-low frequency electromagnetic wave, microwave, millimeter wave, x ray etc. according to the information carrier that is adopted.Though utilize static electricity on human body field, ultralow frequency electromagnetic energy passive detection system power consumption little, be difficult for coming to light, detecting breathing and heartbeat to be low to moderate the signal below the 3Hz like this, need long detection time, and be difficult to range finding and location; Active detection system generally can realize range finding, exists two or more probe units then can be to target localization even imaging, but power consumption is high, is prone to exposure.The carrier of Detection Techniques through walls also respectively has characteristics, and propagation velocity of electromagnetic wave is fast, and working frequency range is high, can under very high repetition frequency, work, but can not the penetrating metal medium; Ultrasound wave can the penetrating metal medium, but velocity of propagation is slower, is unfavorable for real-time positioning; X ray penetrability and resolving power are all better, but human body is had harm.
Summary of the invention
To above-mentioned technical matters, the object of the present invention is to provide a kind of ULTRA-WIDEBAND RADAR formula life-detection system and method, it is strong that it not only penetrates the wall ability, and detection accuracy is high, and simple to operation.
For achieving the above object, the present invention realizes through following technical scheme:
A kind of ULTRA-WIDEBAND RADAR formula life-detection system; It comprises radar host computer and control terminal, and said radar host computer comprises emitting antenna, receiving antenna, transmitter, receiver, master control system and communication unit, and said control terminal is used for the emission detection instruction and receives result of detection; Said communication unit is used for the data transmission between radar host computer and the control terminal; After said master control system receives the probe instructions that communication unit imports into, trigger transmitter and produce ultra wideband narrow-pulse, said emitting antenna is used for radiation ultra wideband narrow-pulse in the scope of observation area; Said receiving antenna is used for the received pulse echo; And import pulse echo into receiver and sample, the data after the sampling are imported master control system into and are carried out that clutter suppresses, detects, judgement, and said communication unit imports the result of master control system into control terminal and shows.
Special, said master control system is embedded master control borad, said transmitter comprises pre-triggering pulse circuit and Marx circuit; Said receiver comprises radio-frequency front-end, analog intermediate frequency signal conversion digital signal (AD) circuit and sequential control module; Said control terminal emission detection instruction, probe instructions gets into timing control unit through communication unit and embedded master control borad, and said timing control unit triggers the pre-triggering pulse circuit; And under the cooperation of Marx circuit, produce the ultra wideband narrow-pulse of nanosecond; Through emitting antenna radiation is carried out in the observation area then, receiving antenna received pulse echo, and import pulse echo into radio-frequency front-end; Said radio-frequency front-end paired pulses echo is handled the back and is got into intermediate frequency AD circuit, and the paired pulses echo carries out equivalent sampling under the control of timing control unit.
Special, said control terminal is a handheld terminal, and said handheld terminal comprises communication unit and PDA(Personal Digital Assistant) mainboard, said PDA mainboard through communication unit to the master control system firing order and receive and demonstration from the data processed result of master control system.
Special, said analog intermediate frequency signal conversion digital signal (AD) circuit comprises step-by-step system, and this step-by-step system comprises fast ramp generator, staircase generator and comparer, and pulse echo is carried out equivalent sampling through step-by-step system after getting into intermediate frequency AD circuit.
Special, said communication unit is the Wi-Fi unit.
The invention also discloses a kind of ULTRA-WIDEBAND RADAR formula life detection method, said method comprises the steps:
S1, the instruction of control terminal emission detection, probe instructions gets into master control system through communication unit, and said master control system triggers transmitter and produces ultra wideband narrow-pulse;
S2, emitting antenna are radiated the observation area with ultra wideband narrow-pulse;
S3, receiving antenna received pulse echo, and import it into receiver;
S4, receiver paired pulses echo are sampled;
S5, master control system are carried out clutter to the data after sampling and are suppressed, detect, adjudicate;
S6, communication unit import the result of master control system into control terminal and show.
Special; Said step S1 to S5 specifically comprises: the instruction of control terminal emission detection; Probe instructions gets into timing control unit through communication unit and embedded master control borad, and said timing control unit triggers the pre-triggering pulse circuit, and under the cooperation of Marx circuit, produces the ultra wideband narrow-pulse of nanosecond; Emitting antenna is radiated the observation area with ultra wideband narrow-pulse then; Receiving antenna received pulse echo is laggard goes into the radio frequency front end, and said radio-frequency front-end paired pulses echo is handled the back and got into analog intermediate frequency signal conversion digital signal (AD) circuit, and the paired pulses echo carries out equivalent sampling under the control of timing control unit.
Special; Said intermediate frequency AD circuit paired pulses echo carries out equivalent sampling and specifically comprises: fast ramp generator produces fast oblique wave; Staircase generator produces staircase waveform, and said fast oblique wave obtains step-by-step impulse after importing comparer into fast oblique wave, and pulse echo realizes equivalent sampling.
Special, said control terminal emission detection instruction specifically comprises: the PDA mainboard of handheld terminal is through being arranged at the communication unit emission detection instruction in the handheld terminal and receiving and the demonstration result of detection.
Special, said communication unit is the Wi-Fi unit.
Beneficial effect of the present invention does, said a kind of ULTRA-WIDEBAND RADAR formula life-detection system and method, and it adopts ultra broadband impulse radar system; It is not only simple in structure, and average power is low, and can realize the distance accuracy of centimetre magnitude; Can discern and differentiation different target type, can overcome the suction wave effect of Narrow-band Radar, the ability that penetrates wall is strong; It is strong that clutter echo under the complex background is suppressed ability, and reliability is high; Adopt equivalent sampling method that ultra wideband narrow-pulse is sampled, utilize lower frequency to realize the equivalent sampling of 5GHz, when keeping system performance, reduced the complexity of system architecture, reduced system cost; Realize that through handheld terminal result shows and order control, can realize man-machine separation during use, reduced the interference of environment, improved system and detected performance the ultra-wide-band emission signal.
Description of drawings
According to accompanying drawing and embodiment the present invention is done further explain below.
Fig. 1 is the structural representation of ULTRA-WIDEBAND RADAR formula life-detection system of the present invention;
Fig. 2 is the principle schematic of transmitter of the present invention;
Fig. 3 is the principle schematic of receiver of the present invention;
Fig. 4 is the principle schematic of the equivalent sampling method that adopts of the present invention;
Fig. 5 is the principle schematic of step-by-step system of the present invention;
Fig. 6 is emitting antenna of the present invention and the structural representation of accepting antenna;
Fig. 7 is emitting antenna of the present invention and the assembling synoptic diagram of accepting antenna;
Fig. 8 is the process flow diagram of ULTRA-WIDEBAND RADAR formula life detection method of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.Please with reference to shown in Figure 1, Fig. 1 is the structural representation of ULTRA-WIDEBAND RADAR formula life-detection system of the present invention.
In the present embodiment; A kind of ULTRA-WIDEBAND RADAR formula life-detection system; Comprise radar host computer 1 and handheld terminal 15; Said radar host computer 1 comprises emitting antenna 10, receiving antenna 11, transmitter 2, receiver 5, embedded master control borad 9, power supply 12 and Wi-Fi unit 13, and said transmitter 2 comprises pre-triggering pulse circuit 3 and Marx circuit 4, and said receiver 5 comprises radio-frequency front-end 8, intermediate frequency AD circuit 7 and sequential control module 6; Said power supply 12 is Marx circuit 4, embedded master control borad 9, intermediate frequency AD circuit 7 and 6 power supplies of sequential control module; Said handheld terminal 15 comprises Wi-Fi unit 15 and PDA mainboard 14, said PDA mainboard 14 emission detection instruction, and probe instructions is the embedded master control borad 9 of 13 entering through the Wi-Fi unit; After said embedded master control borad 9 control timing control modules 6 trigger pre-triggering pulse circuit 3; Cooperate the ultra wideband narrow-pulse that produces nanosecond down at Marx circuit 4, carry out radiation through 10 pairs of observation areas of emitting antenna then, pulse echo is gone into radio frequency front end 8 through receiving antenna 11 receptions are laggard; Said radio-frequency front-end 8 paired pulses echoes are handled the back and are got into intermediate frequency AD circuit 7; Said intermediate frequency AD circuit 7 carries out equivalent sampling under the control of timing control unit 6, import data into embedded master control borad 9 then and carry out that clutter suppresses, detects, judgement, and import result into PDA mainboard 14 through Wi-Fi unit 13 and show.
Please with reference to shown in Figure 2, Fig. 2 is the principle schematic of transmitter of the present invention.The core of said transmitter 2 is high power nanosecond pulse sources; The nanosecond pulse of high power described in present embodiment source is made up of pre-triggering pulse circuit 3 and Marx circuit 4; High-power pulse source of the prior art mainly is to utilize the break-make of on off state to switch the forming process of accomplishing pulse waveform, so switch performances has directly influenced the index of pulse waveform.After taking all factors into consideration factors such as switch power tolerance limit, response time, degree of stability and the repetition upper limit; The pre-triggering pulse circuit 3 of present embodiment selects for use all solid state microwave circuit of avalanche transistor to carry out the design of high stability impulse source; And through the higher emissive power of Marx circuit 4 realizations; Be a plurality of pipes by power supply 12 charged in parallels, connect then to load discharge, make that output pulse amplitude can be far above supply voltage.Timing control unit 6 is launched controlled repetition trigger pip to all solid state microwave circuit of avalanche transistor; Direct current (DC) the 100V terminal of power supply 12 is that transmitter provides the 100V high pressure to charge simultaneously; The snowslide triode utilizes avalanche effect to produce nanosecond pulse, carries out radiation through 10 pairs of observation areas of emitting antenna then.
Please with reference to shown in Figure 3, Fig. 3 is the principle schematic of receiver of the present invention.Said receiver 5 comprises radio-frequency front-end 8, intermediate frequency AD circuit 7 and timing control unit 6 three parts; After receiving antenna 11 is received the nanosecond pulse echo; Get into radio-frequency front-end 8, for reducing the sampling rate requirement, said radio-frequency front-end 8 utilizes psec stepping sequential gating technique paired pulses echo to carry out effective broadening; The broadening echo gets into intermediate frequency AD circuit 7 and carries out equivalent sampling; Sampled data gets into embedded master control borad 9 through the USB interface of timing control unit 6 and carries out signal Processing, and detecting has driftlessness to have the psec stepping gating sequential that said sequential control unit 6 not only provides for radio-frequency front-end 8; Being also responsible for intermediate frequency AD circuit 7 provides sampling time sequence to trigger, and triggers for transmitter 2 provides the emission sequential.
Show with reference to Fig. 4 that please Fig. 4 is the principle schematic of the equivalent sampling method that adopts of the present invention.Radar receiver 5 design cores are design high-speed pulse sample circuits; For high speed analog signal is carried out undistorted collection; According to nyquist sampling theorem, SF is necessary for more than 2 times of signal frequency, and the equivalent bandwidth of received pulse is approximately 500MHz in the present embodiment; Sampling rate could realize undistorted sampling more than must reaching 1GHz; Very high to device speed, circuit structure and system debug requirement, because pulse echo signal is approximately periodic signal, utilize the periodicity of signal; Adopt the equivalent time sampling principle to realize data acquisition at a high speed, realize difficulty thereby under the prerequisite that keeps system performance, reduced system with intermediate frequency AD circuit 7 than low speed.The ultimate principle of equivalent sampling: shown in Fig. 4 (a); If signal to be measured is f (t), but this signal is a repeating signal, and its repetition period is T; Shown in Fig. 4 (b) and Fig. 4 (c); Getting the sampling period is TS=T+ Δ t, and sampling obtains signal f S0=f (0) when t=0, when t=T+ Δ t, obtains signal f S1=f (T+ Δ t)=f (Δ t); And the like, when t=n (T+ Δ t), obtain signal fSn=f (nT+n Δ t)=f (n Δ t); Obtain at last sample preface f S0, f S1, f S2,, f Sn, these samples and employing cycle are that the real-time sampling of Δ t comes to the same thing, if be that sampling thheorem is satisfied in the sampling in cycle with Δ t, then above-mentioned equivalent sampling just can be got the complete information of f (t).This shows that equivalent sampled signal has comprised similarly all frequency contents of original input signal, just frequency reduces Δ t/TS doubly.
Please with reference to shown in Figure 5, Fig. 5 is the principle schematic of step-by-step system of the present invention.Equivalent time sampling adopts the method for stepping sampling to realize usually; Signal weekly the phase by once sampling; Form new waveform through n sampling back; Sampled point all is that the positive dirction along time shaft moves, and each sampled point is apart from the incremental time delay time that a step value Δ t is arranged by the cycle starting point of sampled signal.The equivalent sampling system depends on good step-by-step system and realizes Δ t.The precision of step-by-step system is to realize the key of equivalent sampling, the difficult point when also being the sampling system circuit design, and said step-by-step system comprises fast ramp generator, staircase generator and comparer.Present embodiment adopts the core devices of the high-speed figure programmable delay generator AD9500 of U.S. Analog Device company as step-by-step system; This device is integrated in main circuit in fast ramp generator, the staircase generator and comparer in the chip; Minimum time-delay resolution can reach 10ps, and the equivalent sampling frequency can reach 100GHz.And AD9500 adopts the ECL circuit engineering, and not only speed is fast, and logic function is strong, and fan out capability is high, and noise is low, and it is little to crosstalk, and has improved the performance of step-by-step system.
Please with reference to Fig. 6, Fig. 6 is emitting antenna of the present invention and the structural representation of accepting antenna.Emitting antenna 10 in the present embodiment with accept antenna 11 and all adopt the knot antenna; The knot antenna belongs to ultra-wideband antenna, and it has higher radiation efficiency and receiving sensitivity, has directivity and enough bandwidth preferably; Can satisfy the needs of life detection; And the knot antenna belongs to time domain fidelity antenna, and it does not have effect of dispersion, can not make the transmitting pulse waveform distortion.Shown in Figure 7 for transmitting and receiving the assembling synoptic diagram of antenna, in order to reduce the interference of electromagnetic signal, adopt shielding cavity to shield to emitting antenna 10 and receiving antenna 11.
Groundwork process of the present invention:
1) radar host computer 1 and handheld terminal 15 starts, handheld terminal 15 gets into the radar software interface.
2) click radar operation button under handheld terminal 15 software interfaces, send the radar operating instruction to radar host computer 1 through Wi-Fi unit 15.
3) radar host computer 1 carries out radiation through transmitter 2 emission electromagnetic pulses through 10 pairs of observation areas of emitting antenna, and pulse echo gets into receiver 5 after receiving antenna 11 receives, and receiver 5 paired pulses echoes carry out equivalent sampling.
4) sampled data is handled at embedded master control borad 9, handles the back data and gives handheld terminal 15 through 13 passbacks of Wi-Fi unit, carries out the real-time demonstration of testing result.Single approximately needs 15 seconds to 120 seconds working time.
5) as required, select to proceed to survey next time, perhaps withdraw from software, finish to survey.
6) handheld terminal 15 and radar host computer 1 shutdown.
Please with reference to shown in Figure 8, Fig. 8 is the process flow diagram of ULTRA-WIDEBAND RADAR formula life detection method of the present invention;
In the present embodiment, a kind of ULTRA-WIDEBAND RADAR formula life detection method, said method comprises the steps:
The PDA mainboard of step 101, handheld terminal is through being arranged at the Wi-Fi unit emission detection instruction in the handheld terminal; Probe instructions gets into timing control unit through Wi-Fi unit and the embedded master control borad that is arranged in the radar host computer; Said timing control unit triggers the pre-triggering pulse circuit, and under the cooperation of Marx circuit, produces the ultra wideband narrow-pulse of nanosecond.
Said a kind of ULTRA-WIDEBAND RADAR formula life-detection system and method adopt ultra broadband impulse radar system, and it not only establishes simple in structure, and average power is low; And can realize the distance accuracy of centimetre magnitude; Can discern and differentiation different target type, can overcome the suction wave effect of Narrow-band Radar, the ability that penetrates wall is strong; It is strong that clutter echo under the complex background is suppressed ability, and reliability is high; Adopt equivalent sampling method that ultra wideband narrow-pulse is sampled, utilize lower frequency to realize the equivalent sampling of 5GHz, when keeping system performance, reduced the complexity of system architecture, reduced system cost; Realize that through handheld terminal 15 result shows and order control, can realize man-machine separation during use, reduced the interference of environment, improved system and detected performance the ultra-wide-band emission signal.
Above-mentioned preferred embodiment of the present invention and the institute's application technology principle of being merely, any technician who is familiar with the present technique field in the technical scope that the present invention discloses, the variation that can expect easily or replacement, all should be encompassed in protection scope of the present invention in.
Claims (10)
1. ULTRA-WIDEBAND RADAR formula life-detection system; It is characterized in that; Said system comprises radar host computer and control terminal, and said radar host computer comprises emitting antenna, receiving antenna, transmitter, receiver, master control system and communication unit, and said control terminal is used for the emission detection instruction and receives result of detection; Said communication unit is used for the data transmission between radar host computer and the control terminal; After said master control system receives the probe instructions that communication unit imports into, trigger transmitter and produce ultra wideband narrow-pulse, said emitting antenna is used for radiation ultra wideband narrow-pulse in the scope of observation area; Said receiving antenna is used for the received pulse echo; And import pulse echo into receiver and sample, the data after the sampling are imported master control system into and are carried out that clutter suppresses, detects, judgement, and said communication unit imports the result of master control system into control terminal and shows.
2. ULTRA-WIDEBAND RADAR formula life-detection system according to claim 1; It is characterized in that; Said master control system is embedded master control borad, and said transmitter comprises pre-triggering pulse circuit and Marx circuit, and said receiver comprises radio-frequency front-end, analog intermediate frequency signal conversion digital signal (AD) circuit and sequential control module; Said control terminal emission detection instruction; Probe instructions gets into timing control unit through communication unit and embedded master control borad, and said timing control unit triggers the pre-triggering pulse circuit, and under the cooperation of Marx circuit, produces the ultra wideband narrow-pulse of nanosecond; Through emitting antenna radiation is carried out in the observation area then; Pulse echo receives the laggard radio frequency front end of going into through receiving antenna, and said radio-frequency front-end paired pulses echo is handled the back and got into intermediate frequency AD circuit, and the paired pulses echo carries out equivalent sampling under the control of timing control unit.
3. ULTRA-WIDEBAND RADAR formula life-detection system according to claim 1 and 2; It is characterized in that; Said control terminal is a handheld terminal; Said handheld terminal comprises communication unit and PDA(Personal Digital Assistant) mainboard, said PDA mainboard through communication unit to the master control system firing order and receive and show data processed result from master control system.
4. ULTRA-WIDEBAND RADAR formula life-detection system according to claim 2; It is characterized in that; Said intermediate frequency AD circuit comprises step-by-step system; Said step-by-step system comprises fast ramp generator, staircase generator and comparer, and the pulse echo that gets into intermediate frequency AD circuit is carried out equivalent sampling through step-by-step system.
5. according to the described ULTRA-WIDEBAND RADAR formula of one of claim 1 to 4 life-detection system, it is characterized in that said communication unit is the Wi-Fi unit.
6. a ULTRA-WIDEBAND RADAR formula life detection method is characterized in that, comprises the steps:
S1, the instruction of control terminal emission detection, probe instructions gets into master control system through communication unit, and said master control system triggers transmitter and produces ultra wideband narrow-pulse;
S2, emitting antenna are radiated the observation area with ultra wideband narrow-pulse;
S3, receiving antenna received pulse echo, and import it into receiver;
S4, receiver paired pulses echo are sampled;
S5, master control system are carried out clutter to the data after sampling and are suppressed, detect, adjudicate;
S6, communication unit import the result of master control system into control terminal and show.
7. ULTRA-WIDEBAND RADAR formula life detection method according to claim 6; It is characterized in that; Said step S1 to S5 specifically comprises: the instruction of control terminal emission detection; Probe instructions gets into timing control unit through communication unit and embedded master control borad, and said timing control unit triggers the pre-triggering pulse circuit, and under the cooperation of Marx circuit, produces the ultra wideband narrow-pulse of nanosecond; Emitting antenna is radiated the observation area with ultra wideband narrow-pulse then; Receiving antenna received pulse echo is laggard goes into the radio frequency front end, and said radio-frequency front-end paired pulses echo is handled the back and got into analog intermediate frequency signal conversion digital signal (AD) circuit, and the paired pulses echo carries out equivalent sampling under the control of timing control unit.
8. ULTRA-WIDEBAND RADAR formula life detection method according to claim 6; It is characterized in that; Said intermediate frequency AD circuit paired pulses echo carries out equivalent sampling and specifically comprises: fast ramp generator produces fast oblique wave; Staircase generator produces staircase waveform, and said fast oblique wave obtains step-by-step impulse after importing comparer into fast oblique wave, and pulse echo realizes equivalent sampling.
9. according to the described ULTRA-WIDEBAND RADAR formula of one of claim 6 to 8 life detection method; It is characterized in that said control terminal emission detection instruction specifically comprises: the PDA mainboard of handheld terminal is through being arranged at the communication unit emission detection instruction in the handheld terminal and receiving and the demonstration result of detection.
10. according to the described ULTRA-WIDEBAND RADAR formula of one of claim 6 to 9 life detection method, it is characterized in that said communication unit is the Wi-Fi unit.
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| CN103076598A (en) * | 2012-12-31 | 2013-05-01 | 中国科学技术大学 | Experimental device used for researching influence of smoke on radar life detection signal |
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