CN104931940B - A kind of through-wall detection body of wall suppressing method based on phase locked track loop - Google Patents
A kind of through-wall detection body of wall suppressing method based on phase locked track loop Download PDFInfo
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- CN104931940B CN104931940B CN201510320940.3A CN201510320940A CN104931940B CN 104931940 B CN104931940 B CN 104931940B CN 201510320940 A CN201510320940 A CN 201510320940A CN 104931940 B CN104931940 B CN 104931940B
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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
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/887—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons
- G01S13/888—Radar or analogous systems specially adapted for specific applications for detection of concealed objects, e.g. contraband or weapons through wall detection
-
- 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
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
-
- 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
- G01S7/352—Receivers
- G01S7/358—Receivers using I/Q processing
Abstract
The invention discloses a kind of through-wall detection body of wall suppressing method based on phase locked track loop, step includes：1) local carrier sin and cos being produced the original echoed signals that reception antenna receives with PLL module is multiplied respectively, is divided into two paths of signals after peeling off carrier wave；2) two paths of signals is sent into together in a DLL module, after calculating delay phase place τ of M sequence, export M sequence, be multiplied with the carrier wave cos of PLL module output, obtain direct-path signal；3) primary signal receiving and direct-path signal are subtracted each other, obtain direct signal；4) pass sequentially through multiple DLL modules, repeat step 1) to step 3) processing mode, finally give target echo information,.The inventive method, is applied in through-wall radar, and signal to noise ratio is suitable, and target acquisition is accurate.
Description
Technical field
The invention belongs to radar through-wall detection technical field, it is related to a kind of through-wall detection body of wall based on phase locked track loop
Suppressing method.
Background technology
Through-wall radar passes through to send the electromagnetic wave of characteristic frequency, and the non-transparent medium such as body of wall, plank, trees are penetrated
Detect, the electromagnetic wave of 0.5GHz～3GHz has good penetration capacity to body of wall, and will not hurt human body.Through-wall radar can
Through concrete wall, slabstone body of wall, plank body of wall etc., to have extensively at aspects such as Post disaster relief, hostage's rescue, urban operations
General application.In through-wall radar imaging, due to the presence of body of wall, when electromagnetic wave penetrates wall, electromagnetic wave can reflect,
Refraction and the change of speed, thus lead to signal that time delay, decay and distortion occur；After wall the image of target can produce displacement,
Ghost etc. affects, and causes the deviation with realistic objective.
In prior art, the geometry of the with good grounds body of wall of suppressing method of body of wall and electromagnetic property estimate the echo letter of body of wall
Breath, this needs the prior information of body of wall parameter；Or estimate the electromagnetic parameter of body of wall by echo information, however it is necessary that consider
Multiple probabilities of body of wall, it will lead to process time extremely long, real-time is poor.
Content of the invention
It is an object of the invention to provide a kind of through-wall detection body of wall suppressing method based on phase locked track loop, solve existing
Body of wall parameter estimating error with the presence of technology leads to detect Target Location Error, and in echo-signal, target and body of wall aliasing lead to
The problem of target information cannot be separated.
The technical solution adopted in the present invention is, a kind of through-wall detection body of wall suppressing method based on phase locked track loop,
Implement according to following steps：
Step 1：The original echoed signals that reception antenna is received are expressed as the local of S (t), S (t) and PLL module generation
Carrier wave sin and cos is multiplied respectively, is divided into two paths of signals, that is, is divided into I road signal S after peeling off carrier waveI(t) and Q road signal SQ(t)；
Step 2：By I road signal SI(t) and Q road signal SQT () is sent in a DLL module together, by a DLL
After module calculates delay phase place τ of M sequence, export M sequence m (τ0), it is multiplied with the carrier wave cos of PLL module output, gone directly
Ripple signal y1(t)；
Step 3：By primary signal S (t) receiving and direct-path signal y1T () subtracts each other, obtain direct signal S'
(t)；
Step 4：By the 2nd DLL module, to removing direct signal S'(t) proceed step 1 to the process of step 3, obtain
To removal body of wall primary event signal S " (t)；By the 3rd DLL module, to removing body of wall primary event signal S " (t) continue into
Row step 1, to the process of step 3, obtains removing body of wall secondary reflection signal；By that analogy, by the process of N number of DLL module,
Finally give target echo information,.
The invention has the beneficial effects as follows, the method is applied in through-wall radar, and signal to noise ratio is suitable, and target acquisition is accurate.Adopt
With a kind of multistage suppression technology, thickness and the electrical quantity of body of wall in the case of unknown body of wall parameter, need not be calculated, thus avoiding
Body of wall parameter estimating error leads to detect Target Location Error, overcomes in conventional art in the nearlyer situation of target range body of wall
Under, in echo-signal, target and body of wall aliasing lead to not the shortcoming separating target information.
Brief description
Fig. 1 is the application scenarios schematic diagram of the inventive method original echoed signals；
Fig. 2 is the theory diagram of the inventive method；
Fig. 3 is the control process schematic diagram of the inventive method；
Fig. 4 is employing (first, second, third) DLL module control principle schematic diagram in the inventive method；
Fig. 5 is the inventive method and conventional spread spectrum radar range comparison diagram；
Fig. 6 is the inventive method and conventional spread spectrum radar noise resisting ability comparison diagram.
In figure, 1.PLL module, a 2. DLL module, 3. the 2nd DLL module, 4. the 3rd DLL module, 5.I amasss on road in advance
Divide device, the delayed integrator in 6.I road, the advanced integrator in 7.Q road, the delayed integrator in 8.Q road, 9. code tracking loop descriminator, 10. loop
Wave filter, 11. yards of offset controllers, 12.M sequence generator.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
With reference to Fig. 1, the transmitting antenna of detection radar sends carrier-modulated spread spectrum code sequence, and signal, through propagating, connects
Receive the original echoed signals receiving at antenna, this original echoed signals contains direct-path signal, body of wall primary event signal, wall
Body secondary reflection signal, target echo signal and ambient noise signal.
With reference to Fig. 2, Fig. 3, the through-wall detection body of wall suppressing method based on delay phase locked track loop for the present invention, for radar
The handling process of signal, implements according to following steps：
Step 1：The original echoed signals that reception antenna is received are expressed as S (t), S (t) and PLL module 1 (carrier track
Ring) local carrier sin and cos that produce be multiplied respectively, be divided into two paths of signals, that is, be divided into I road signal S after peeling off carrier waveI(t) and
Q road signal SQ(t)；
Step 2：By I road signal SI(t) and Q road signal SQT () is sent in a DLL module 2 (delay phase-locked loop) together,
After a DLL module 2 calculates delay phase place τ of M sequence, export M sequence m (τ0), the carrier wave with PLL module 1 output
Cos is multiplied, and reduction obtains direct-path signal y1(t)；
Step 3：By primary signal S (t) receiving and direct-path signal y1T () subtracts each other, obtain direct signal S'
(t)；
Step 4：By the 2nd DLL module 3, to removing direct signal S'(t) proceed step 1 to the process of step 3, obtain
To removal body of wall primary event signal S " (t)；By the 3rd DLL module 4, to removing body of wall primary event signal S, " (t) continues
Carry out step 1 to the process of step 3, obtain removing body of wall secondary reflection signal；By that analogy, by the place of N number of DLL module
Reason, finally gives accurately real target echo information,.
The quantity of above-mentioned DLL module is selected with environment according to body of wall quantity, single body of wall application scenarios state next
As choose N be 3.
The core of the inventive method is to employ multiple DLL modules, and the internal structure of each DLL module is identical, each DLL mould
Block all realizes the function of time lag of first order phaselocked loop, by the continuous circular treatment to signal for multiple DLL modules, finally gives accurately
Real target echo signal.
As shown in figure 4, the work process of each DLL module is, peel off the I road signal after carrier wave and Q road signal table respectively
It is shown as SI(t) and SQT (), by SI(t) and SQ(t) respectively with lead-lag produced by M sequence generator 12 each half-chip δ/
2 M sequence is multiplied and obtains four road signals, and Jiang Gai tetra- road signal is respectively fed to the advanced integrator 5 in corresponding I road, the delayed integration in I road
In device 6, the advanced integrator in Q road 7, the delayed integrator in Q road 8, carry out related cumulative integration, obtain four related accumulation result IE、
IL、QE、QLValue, be respectively：
Again by IE、IL、QE、QLThis four values are input simultaneously to process in code tracking loop descriminator 9, through code tracking loop mirror
Other device 9 is re-fed into loop filter 10 after processing and carries out phase demodulation process, is sent in code offset controller 11, code is inclined after phase demodulation
Shift controller 11 exports the code phase difference signal between the M sequence in receipt signal and local reproduction M sequence, and this signal returns again
Return in M sequence generator 12, realize adjusting local M sequence retardation τ.
First DLL module 2 calculates after the M sequence that retardation obtains is multiplied with carrier wave cos, can obtain reducing direct wave letter
Number, the 2nd DLL module 3 calculates after the M sequence that retardation obtains is multiplied with carrier wave cos, can obtain going back original wall body primary event
Signal；3rd DLL module 4 calculates after the M sequence that retardation obtains is multiplied with carrier wave cos, can obtain going back original wall body secondary counter
Penetrate signal.As shown in figure 3, original echoed signals deduct these recovering signals successively, you can obtain target echo information.
Embodiment 1
The present invention and conventional spread spectrum radar contrast target are in the detectivity under body of wall different distance, two sets of system antennas
Launch same signal, M sequence frequency 1.023GHz, centre carrier frequency 955.8MHz, compared for respectively in target range wall
Body apart from 3m, 1m, 30cm when detectivity, as shown in Figure 5.In Fig. 5, left column is the radar using conventional art spread spectrum, right row
It is the radar using the inventive method.Fig. 5 (a) (b) figure be respectively target range body of wall 3m when, conventional spread spectrum radar with proposed
The related figure of the time domain of radar.Fig. 5 (c) (d) is the partial enlarged drawing of Fig. 5 (a) (b), and in figure is except seeing direct-path signal
Outside body of wall reflection wave signal, can also significantly see target reflection ripple information.Fig. 5 (e) (f) is respectively target range body of wall
Echo information figure during 1m.Fig. 5 (g) (h) is respectively echo information figure during target range body of wall 30cm.Each width figure by Fig. 5
In as can be seen that when target is close to 30cm from body of wall, traditional spread spectrum radar cannot detect target echo information,
And method proposed by the invention still can obtain target echo information.
Embodiment 2
Present invention detectivity under different signal to noise ratios from the contrast of conventional spread spectrum radar.Two sets of system antenna transmittings are same
Signal, M sequence frequency 1.023GHz, centre carrier frequency 955.8MHz.Compared for respectively signal to noise ratio be 40dB, 20dB,
Detectivity when 0dB, -10dB, -20dB, as shown in Figure 6.In Fig. 6, left column is the radar using conventional art spread spectrum, right row
It is the radar using the inventive method.Fig. 6 (a) (b) figure is respectively signal to noise ratio when being 40dB, conventional spread spectrum radar and proposed thunder
The related figure of time domain reaching, from fig. 6 it can be seen that in conventional spread spectrum radar, target echo information has soon been submerged in noise
In, and radar of the present invention, target echo information is fairly obvious.When Fig. 6 (c) (d) figure is respectively signal to noise ratio for 20dB,
Conventional spread spectrum radar figure related to the time domain of proposed radar.When Fig. 6 (e) (f) figure is respectively signal to noise ratio for 0dB, conventional spread spectrum
Radar figure related to the time domain of proposed radar.Fig. 6 (g) (h) figure be respectively signal to noise ratio be -10dB when, conventional spread spectrum radar with
The related figure of the time domain of proposed radar.Fig. 6 (i) (j) figure be respectively signal to noise ratio be -20dB when, conventional spread spectrum radar with proposed
The related figure of the time domain of radar.Can be seen that when signal to noise ratio reaches -10dB by a few width in figures above, the echo letter of conventional radar
In breath, cannot be distinguished by out target information, lost the ability detecting target, and adopt the radar of the inventive method in noise
During than reaching -20dB, still can be detected and being obtained target information, thus the present invention have compared with conventional radar preferably anti-interference
Ability.
Claims (3)
1. a kind of through-wall detection body of wall suppressing method based on phase locked track loop is it is characterised in that implement according to following steps：
Step 1：The original echoed signals that reception antenna is received are expressed as S (t), by original echoed signals S (t) and PLL module
(1) local carrier sin and cos producing is multiplied respectively, is divided into two paths of signals, that is, is divided into I road signal S after peeling off carrier waveI(t) and
Q road signal SQ(t)；
Step 2：By I road signal SI(t) and Q road signal SQT () is sent in a DLL module (2) together, by a DLL mould
After block (2) calculates delay phase place τ of M sequence, export M sequence m (τ0), the carrier wave cos being exported with PLL module (1) is multiplied, and obtains
Direct-path signal y1(t)；
Step 3：By original echoed signals S (t) receiving and direct-path signal y1T () subtracts each other, obtain direct signal S'(t)；
Step 4：By the 2nd DLL module (3), direct signal S'(t will be removed) replace with S (t), proceed step 1 to step 3
Signal processing mode, obtain remove body of wall primary event signal S " (t)；
By the 3rd DLL module (4), body of wall primary event signal S will be removed " (t) replaces with S (t), proceed step 1 to
The signal processing mode of step 3, obtains removing body of wall secondary reflection signal；
By that analogy, by the process of N number of DLL module, finally give target echo information,.
2. the through-wall detection body of wall suppressing method based on phase locked track loop according to claim 1 is it is characterised in that institute
The quantity of the DLL module stated N under single body of wall application scenarios state is 3.
3. the through-wall detection body of wall suppressing method based on phase locked track loop according to claim 1 is it is characterised in that institute
The work process of each the DLL module stated is to peel off the I road signal after carrier wave and Q road signal is expressed as SI(t) and SQ
T (), by SI(t) and SQ(t) M sequence phase with each half-chip δ/2 of lead-lag produced by M sequence generator (12) respectively
Multiplied to four road signals, Jiang Gai tetra- road signal is respectively fed to the advanced integrator in corresponding I road (5), the delayed integrator in I road (6), Q
In the advanced integrator in road (7), the delayed integrator in Q road (8), when carrying out, the correlation of a length of T adds up and integrates, and obtains four correlations and adds up
Result IE、IL、QE、QLValue, be respectively：
Again by IE、IL、QE、QLThis four values are input simultaneously to process in code tracking loop descriminator (9), through code tracking loop descriminator
(9) it is re-fed into loop filter (10) after processing and carries out phase demodulation process, sent into after phase demodulation in code offset controller (11), code
Offset controller (11) exports the code phase difference signal between the M sequence in receipt signal and local reproduction M sequence, this signal weight
Newly return in M sequence generator (12), realize adjusting local M sequence retardation τ.
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| CN106199538B (en) * | 2016-06-27 | 2019-01-01 | 中国人民解放军火箭军工程大学 | For promoting the clutter suppression method of spread spectrum through-wall radar tracking moving-target precision |
| DE102018212965A1 (en) * | 2018-08-02 | 2020-02-06 | Vega Grieshaber Kg | BATTERY POWERED MEASURING DEVICE |
| CN110398717B (en) * | 2019-06-21 | 2021-06-11 | 电子科技大学 | Strong clutter signal suppression method and system based on step frequency through-wall radar system |
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| CN101826889B (en) * | 2010-03-31 | 2013-04-03 | 北京航空航天大学 | Binary offset carrier signal tracking loop |
| CN102243303B (en) * | 2011-04-13 | 2013-01-09 | 电子科技大学 | Method for locating static human body through wall based on respiratory character |
| KR101682652B1 (en) * | 2013-05-28 | 2016-12-06 | 한국전자통신연구원 | Pulse radar apparatus |
| CN104539856A (en) * | 2014-12-23 | 2015-04-22 | 天津大学 | TDC-based high-speed column level ADC for imaging sensor |
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