CN106526588A - Terahertz active imaging radar system phase compensation method - Google Patents
Terahertz active imaging radar system phase compensation method Download PDFInfo
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- CN106526588A CN106526588A CN201611096628.1A CN201611096628A CN106526588A CN 106526588 A CN106526588 A CN 106526588A CN 201611096628 A CN201611096628 A CN 201611096628A CN 106526588 A CN106526588 A CN 106526588A
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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
- 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
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- Radar, Positioning & Navigation (AREA)
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Abstract
The invention discloses a terahertz active imaging radar system phase compensation method. The method comprises the following steps: S1) opening an internal calibration channel; S2) obtaining phase information of a terahertz wave echo signal of the internal calibration channel; S3) extracting phase error of the terahertz wave echo signal of the internal calibration channel; S4) through a polynomial fitting phase correction function, obtaining monomial and nonlinear term coefficient values of the phase correction function; S5) opening a reception channel; S6) obtaining an intermediate frequency echo signal of the reception channel; S7) analyzing the intermediate frequency echo signal of the reception channel to obtain target distance information; and S8) according to the target distance information and the phase correction function in the step S4), calculating compensation phase, and finishing phase compensation of intermediate frequency echo signal data of the reception channel according to the calculation result of the compensation phase. The advantages are that compared with a conventional phase compensation method, the method is high in adaptation, and can overcome the defects of a conventional terahertz active imaging radar phase compensation method.
Description
Technical field
The present invention relates to Radar Signal Processing Technology field, and in particular to a kind of Terahertz Active Imaging Lidar system phase
Compensation method.
Background technology
The wavelength of Terahertz frequency range is much smaller than existing microwave, millimeter wave, and Terahertz frequency range is more suitable for realizing big signal band
Width, realizes superelevation range resolution ratio, can realize orientation high-resolution, so as to obtain the height of target in the coherent accumulation angle of very little
Resolution imaging information.At present, Terahertz Active Imaging Lidar main function of system be imaging, including one-dimensional range profile,
ISAR is imaged and three-dimensional imaging, and traditional Terahertz Active Imaging Lidar system realizes that block diagram is as shown in Figure 1.
Terahertz Active Imaging Lidar system is combined with superhet using relevant intermediate frequency local oscillator generation technology, harmonic mixing
Reception technique realizes that coherent signal is enrolled.The coherent system both ensure that the sensitivity of receiver and receptivity, in turn ensure that
Accurately, Terahertz active high-resolution imaging is to obtain high Range resolution using the phase information of Terahertz FM signal to phase information
Rate.
However, due to the non-ideal transmission characteristic of Terahertz analog front end circuit, channel transfer function has error, this will
Serious phase error is introduced to Terahertz radar system, on the other hand, the sensor gain and phase uncertainties of IQ passages, and phase error
Another source.The presence of phase error greatly reduces the coherence of signal, Terahertz active imaging system phase distortion
After range resolution ratio can be caused to decline, signal to noise ratio is reduced and apart from image distortion, therefore will carry out phase compensation to radar return.
Conventional phase compensation method mainly has two methods, and the first realizes phase place by setting up channel transfer function error
Compensation, Terahertz Active Imaging Lidar include multiple frequencys multiplication/mixing link, and receive ambient temperature and system operational parameters drift etc.
Affect, it is impossible to simply transfer function to characterize systematic error completely with one, it is difficult to suitable for Terahertz Active Imaging Lidar
System.Another kind is the phase compensation based on reference point, and the method is by being obtained using simple point target under Same Scene
After test data, its nonlinear phase is obtained, the phase place to other complex targets at same position is realized using the phase error
Compensation.But in terahertz wave band radar practical application, preferable point target is hardly resulted in, and the method is under the conditions of moving-target
It is difficult to apply.
The content of the invention
It is an object of the invention to provide a kind of Terahertz Active Imaging Lidar system phase compensation method, by radar
Calibration passage extracts system phase distortion correction signal, approximately obtains the nonlinear phase of an ideal point target, leads to
Cross and the phase error is fitted, obtain radar system phase error function, realized to other mesh of various location using the function
Target phase compensation is corrected, and the echo signal to noise ratio and phase accuracy after phasing is improved, and makes radar system possess reality
Shi Xiangwei error self-correcting abilities, more traditional phase compensating method adaptability are higher, can overcome traditional Terahertz Active Imaging
The deficiency of radar phase compensating method.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of Terahertz Active Imaging Lidar system phase compensation method, is characterized in that, comprise the steps of：
S1, unlatching internal calibration passage；
The phase information of S2, the THz wave echo-signal of acquisition internal calibration passage；
The phase error of S3, the THz wave echo-signal of extraction internal calibration passage；
S4, using fitting of a polynomial phase correction function, obtain phase correction function first order and nonlinear terms coefficient value；
S5, unlatching receiving channel；
S6, the echo signal of intermediate frequency for obtaining receiving channel；
The echo signal of intermediate frequency of S7, analysis receiving channel, obtains target range information；
S8, compensation phase place is calculated according to target range information and the phase correction function in step S4, according to compensation phase
The result of calculation of position completes the echo signal of intermediate frequency data phase compensation of receiving channel.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S3 is specifically included：
By the undistorted THz wave phase of echo for calculating internal calibration passage, the internal calibration passage for actually measuring is contrasted
THz wave echo-signal phase place, extracts internal calibration passage THz wave echo-signal phase error.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S4 is specifically included：
Using fitting of a polynomial phase correction function, function Monomial coefficient a is obtained1Value, nonlinear terms coefficient a2...an
Value and constant term a0；
The polynomial equation is as follows：
φ (t)=a0+a1t+a2t2+a3t3+....+antn (1)
In formula：φ (t) is phase correction function, a1,a2,a3...anFor phase correction function first order and multiple term system
Number, a0For phase correction function constant term, t is the time, and discrete rear t values sampling interval is related to sample rate, and target range is determined
Initial time.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S7 is specifically included：
Initial time is obtained according to target range information, initial time computing formula is as follows：
In formula：tQFor initial time, C is the light velocity；R is target range, and T is radar system time delay；
Time serieses are determined according to sampling interval and sampling number, time serieses is substituted into and is compensated in formula (1) successively
Phase sequence.
The present invention has advantages below compared with prior art：System phase distortion is extracted by radar internal calibration passage
Error correction signal, approximately obtains the nonlinear phase of an ideal point target, by being fitted to the phase error, obtains radar
Systematic phase error function, realizes the phase compensation correction to other targets of various location using the function, after phasing
Echo signal to noise ratio and phase accuracy be improved, and make radar system possess real-time phase error self-correcting ability, it is more traditional
Phase compensating method adaptability it is higher, traditional Terahertz Active Imaging Lidar phase compensating method can be overcome the shortcomings of.
Description of the drawings
Fig. 1 realizes block diagram for the Terahertz Active Imaging Lidar system of prior art；
Fig. 2 constitutes frame by the Terahertz Active Imaging Lidar system comprising internal calibration passage that the method for the present invention is used
Figure；
Fig. 3 is method of the present invention flow chart.
Specific embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
Realize the radar system composition frame chart used by the inventive method as shown in Fig. 2 Terahertz WBFM signal is produced
Using frequency multiplication mode, the reception technique combined with superhet by be concerned with intermediate frequency local oscillator generation technology, harmonic mixing realizes terahertz
Hereby Active Imaging Lidar system.Frequency source 1 and frequency source 2 are by same WBFM signal by 2 frequency phase-differences for 25MHz's
Point frequency source upconverts to X-band, for driving transmitting frequency multiplication link 1 i.e. transmission channel and receiving frequency multiplication link 4 i.e. receiving channel；
The X-band FM signal that frequency source 1 is produced by transmitting frequency multiplication link 1 lifts W-waveband through 9 process of frequency multiplication, then by 2 times two
Frequency multiplication produces THz wave；Most of THz wave by being radiate by transmitting antenna after bonder 2, sub-fraction Terahertz
Ripple is coupled to internal calibration passage 3, for system internal calibration.Receive frequency multiplication 4 processing procedures of link consistent with transmission channel, by frequency
The X-band FM signal frequency multiplication that source 2 produces is amplified to terahertz wave band, and the THz wave echo that reception antenna is received is adopted
The method of harmonic mixing is down-converted to intermediate-freuqncy signal.It is 2 mixed frequency signal Jing of 25MHz frequency sources 1 and frequency source by 2 frequency phase-differences
Cross that frequency mixer 5 carries out 24 frequencys multiplication and octamonic amplifier 6 is amplified the local oscillator after processing as double conversion, it is mixed with harmonic wave
The intermediate-freuqncy signal that frequency device is obtained obtains orthogonal baseband signal by the mixing of IQ demodulators 8, sends into Signal acquiring and processing module 9
Imaging processing is completed, selecting switch 7 is set in internal calibration passage 3 and the outfan for receiving frequency multiplication link 4, selecting switch 7 is exported
Connection IQ demodulators 8.
In the present embodiment, radar internal calibration passage 3 and reception frequency multiplication link 4 design completely the same, real by 7 control of switch
By internal calibration passage 3, existing channel selecting, realizes that radar system phase error is extracted, such that it is able to realize to radar system phase place
Distortion carries out real-Time Compensation, and ambient temperature and system operational parameters drift etc. can be overcome to affect, it is easy to Project Realization.
The phase compensation of the inventive method and imaging processing synchronously can be carried out, and imaging can be greatly improved after phase compensation
Precision, the phase compensating method are completed by Signal acquiring and processing module 9, control selections switch 7 gates internal calibration passage first
3, fit phase correction function after 3 echo-signal phase error of internal calibration passage, then the gating receiving channel of controlling switch 7 are obtained,
The receipts that achieve a butt joint channel phases compensation, specifically, as shown in figure 3, the method includes the steps of：
S1, unlatching internal calibration passage 3；
The phase information of S2, the THz wave echo-signal of acquisition internal calibration passage；
The phase error of S3, the THz wave echo-signal of extraction internal calibration passage；
S4, using fitting of a polynomial phase correction function, obtain phase correction function first order and nonlinear terms coefficient value；
S5, unlatching receiving channel；
S6, the echo signal of intermediate frequency for obtaining receiving channel；
The echo signal of intermediate frequency of S7, analysis receiving channel, obtains target range information；
S8, compensation phase place is calculated according to target range information and the phase correction function in step S4, according to compensation phase
The result of calculation of position completes the echo signal of intermediate frequency data phase compensation of receiving channel.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S3 is specifically included：It is logical
The undistorted THz wave phase of echo for calculating internal calibration passage is crossed, 3 THz wave of internal calibration passage for actually measuring is contrasted
Echo-signal phase place, extracts 3 THz wave echo-signal phase error of internal calibration passage.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S4 is specifically included：
Using fitting of a polynomial phase correction function, function Monomial coefficient a is obtained1Value, nonlinear terms coefficient a2...an
Value and constant term a0；
The polynomial equation is as follows：
φ (t)=a0+a1t+a2t2+a3t3+....+antn (1)
In formula：φ (t) is phase correction function, a1,a2,a3...anFor phase correction function first order and multiple term system
Number, a0For phase correction function constant term, t is the time, and discrete rear t values sampling interval is related to sample rate, and target range is determined
Initial time.
Above-mentioned Terahertz Active Imaging Lidar system phase compensation method, wherein, described step S7 is specifically included：
Initial time is obtained according to target range information, initial time computing formula is as follows：
In formula：tQFor initial time, C is the light velocity；R is target range, and T is radar system time delay；
Time serieses are determined according to sampling interval and sampling number, time serieses is substituted into and is compensated in formula (1) successively
Phase sequence.
Although present disclosure has been made to be discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
Various modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (4)
1. a kind of Terahertz Active Imaging Lidar system phase compensation method, it is characterised in that comprise the steps of：
S1, unlatching internal calibration passage；
The phase information of S2, the THz wave echo-signal of acquisition internal calibration passage；
The phase error of S3, the THz wave echo-signal of extraction internal calibration passage；
S4, using fitting of a polynomial phase correction function, obtain phase correction function first order and nonlinear terms coefficient value；
S5, unlatching receiving channel；
S6, the echo signal of intermediate frequency for obtaining receiving channel；
The echo signal of intermediate frequency of S7, analysis receiving channel, obtains target range information；
S8, compensation phase place is calculated according to target range information and the phase correction function in step S4, according to compensation phase place
Result of calculation completes the echo signal of intermediate frequency data phase compensation of receiving channel.
2. Terahertz Active Imaging Lidar system phase compensation method as claimed in claim 1, it is characterised in that described step
Rapid S3 is specifically included：
By the undistorted THz wave phase of echo for calculating internal calibration passage, the internal calibration passage terahertz for actually measuring is contrasted
Hereby ripple echo-signal phase place, extracts internal calibration passage THz wave echo-signal phase error.
3. Terahertz Active Imaging Lidar system phase compensation method as claimed in claim 2, it is characterised in that described step
Rapid S4 is specifically included：
Using fitting of a polynomial phase correction function, function Monomial coefficient a is obtained1Value, nonlinear terms coefficient a2...anValue and
Constant term a0；
The polynomial equation is as follows：
φ (t)=a0+a1t+a2t2+a3t3+....+antn (1)
In formula：φ (t) is phase correction function, a1,a2,a3...anFor phase correction function first order and multiple term coefficient, a0For
Phase correction function constant term, t are the time, and discrete rear t values sampling interval is related to sample rate, when target range determines starting
Between.
4. Terahertz Active Imaging Lidar system phase compensation method as claimed in claim 3, it is characterised in that described step
Rapid S7 is specifically included：
Initial time is obtained according to target range information, initial time computing formula is as follows：
In formula：tQFor initial time, C is the light velocity；R is target range, and T is radar system time delay；
Time serieses are determined according to sampling interval and sampling number, time serieses is substituted in formula (1) and is compensated phase place successively
Sequence.
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| CN109307868A (en) * | 2018-09-20 | 2019-02-05 | 北京遥感设备研究所 | A kind of pulse imaging system and method suitable for terahertz wave band |
| CN110031810A (en) * | 2019-04-16 | 2019-07-19 | 北京遥感设备研究所 | A kind of monopulse radar penalty coefficient automatic correction system |
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| CN111901263A (en) * | 2020-08-05 | 2020-11-06 | Oppo广东移动通信有限公司 | Wireless signal compensation method, value determination method, device, equipment and medium |
| CN113567940A (en) * | 2021-07-23 | 2021-10-29 | 中山大学 | Method for estimating channel error of broadband radar system based on long-time accumulation, computer device and storage medium |
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| CN107144825B (en) * | 2017-04-25 | 2019-10-01 | 西安电子科技大学 | A kind of imparametrization DTV external illuminators-based radar Doppler's diffusion compensation method |
| CN107144825A (en) * | 2017-04-25 | 2017-09-08 | 西安电子科技大学 | A kind of imparametrization DTV external illuminators-based radar Doppler's diffusion compensation method |
| CN109307868A (en) * | 2018-09-20 | 2019-02-05 | 北京遥感设备研究所 | A kind of pulse imaging system and method suitable for terahertz wave band |
| CN110058219A (en) * | 2018-12-30 | 2019-07-26 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | MIMO harmonic radar |
| CN110031810A (en) * | 2019-04-16 | 2019-07-19 | 北京遥感设备研究所 | A kind of monopulse radar penalty coefficient automatic correction system |
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| CN110308445A (en) * | 2019-07-18 | 2019-10-08 | 中国电子科技集团公司第二十九研究所 | A kind of imaging method based on vehicle-mounted digital battle array frequency modulated continuous wave radar |
| CN110308445B (en) * | 2019-07-18 | 2022-10-04 | 中国电子科技集团公司第二十九研究所 | Imaging method based on vehicle-mounted digital array frequency modulation continuous wave radar |
| CN110531329A (en) * | 2019-09-25 | 2019-12-03 | 中南大学 | A kind of multichannel error self-correcting method for impulse formula through-wall radar |
| CN110531329B (en) * | 2019-09-25 | 2023-06-27 | 中南大学 | Multichannel error self-correction method for impulse type through-wall radar |
| CN111901263A (en) * | 2020-08-05 | 2020-11-06 | Oppo广东移动通信有限公司 | Wireless signal compensation method, value determination method, device, equipment and medium |
| CN113567940A (en) * | 2021-07-23 | 2021-10-29 | 中山大学 | Method for estimating channel error of broadband radar system based on long-time accumulation, computer device and storage medium |
| CN113567940B (en) * | 2021-07-23 | 2023-10-20 | 中山大学 | Long-time accumulation-based wideband radar system channel error estimation method, computer device and storage medium |
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