CN103634002A - Real-time calibration system and method for broadband VCO (Voltage Controlled Oscillator) linearity - Google Patents
Real-time calibration system and method for broadband VCO (Voltage Controlled Oscillator) linearity Download PDFInfo
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Abstract
The invention relates to a real-time calibration method for broadband VCO (Voltage Controlled Oscillator) linearity. The calibration method utilizes the principle that a VCO generates a linear frequency-modulation continuous-wave signal to measure the distance, a high-frequency broadband VCO output signal is converted into a low-frequency narrowband signal containing distance information and VCO non-linear error information, the distance information can be removed by an external reference source, and a phase error signal is converted into a voltage error signal by a phase discriminator to control the modulating voltage of the VCO, so that the real-time calibration of the VCO linearity is completed. The method can effectively calibrate the VCO linearity in real time, so that the linear frequency-modulation continuous-wave signal generated by the VCO has high linearity and the distance measuring precision is ensured.
Description
Technical field
The present invention relates to real-time calibration system and the calibration steps of a kind of broadband VCO linearity.
Background technology
While adopting broadband VCO to produce linear frequency modulation continuous wave (LFMCW) signal, when the linearity of property Continuous Wave with frequency modulation signal is poor, for single fixed target, Beat Signal will not be simple signal, and having certain bandwidth, frequency spectrum, by broadened, affects the high resolution of radar.How in real time, the linearity of effectively calibrating VCO becomes the key technology that VCO produces Continuous Wave with frequency modulation signal.
At present, applied for and relevant scientific paper in the VCO linearity calibration steps that adopts comprise: delay-frequency-discrimination method, digital closed loop correction method and closed-loop simulation correction method.Delay-frequency-discrimination method need to be added a grade frequency dividing circuit after frequency mixer, and the complexity that this has increased system is greatly unfavorable for follow-up Miniaturization Design, and the VCO linearity after proofreading and correct is subject to the frequency discrimination sensitivity of frequency discriminator to affect larger.Although it is very high that digital closed loop correction method can be done the linearity after calibration, but the cost of obtaining of high linearity is that complicated algorithm is realized and longer D/A word length, can make like this system deal with data amount increase, respond slack-off, the method that solves this difficult problem is to adopt high speed processing device, has so just strengthened the cost of system.Although the linearity after closed-loop simulation bearing calibration calibration has certain gap compared with closed-loop digital corrective system, but can meet the generally requirement of ranging system to the linearity, and the response time of closed-loop simulation corrective system in the rational situation of loop design, can do very short.
Summary of the invention
For above the deficiencies in the prior art, the invention provides real-time calibration system and the calibration steps of a kind of broadband VCO linearity.
Object of the present invention is achieved through the following technical solutions:
The real-time calibration method of a kind of broadband VCO linearity comprises the steps:
S1. the signal of VCO output is carried out to merit is divided and time delay, obtain two-way not time delay and delay time signal;
S2. step 1 two-way not time delay and delay time signal carry out mixing and filtering, obtain difference frequency signal;
S3. determine the phase error signal of reference source;
S4. described phase error signal is converted to voltage control signal FEEDBACK CONTROL VCO.
The phase place of described not delay time signal is
The phase place of described delay time signal is
Described difference frequency signal phase place is
The real-time calibration system of a kind of broadband VCO linearity comprises VCO, power splitter, delayer, frequency mixer, low pass filter, phase discriminator and loop filter and adder, the signal of described VCO output is input to power splitter, by power splitter, export two paths of signals, two paths of signals Zhong mono-tunnel is directly delivered to the local oscillator port of frequency mixer, the signal on another road is delivered to the input port of frequency mixer after by time delay, phase discriminator carries out phase demodulation with reference source signal by the output signal of frequency mixer after by low pass filter, signal after phase demodulation obtains the phase error corresponding voltage control signal of VCO by loop filter, this controls voltage signal by the modulated voltage signal of adder FEEDBACK CONTROL VCO, complete the real time calibration of the VCO linearity.
The invention has the advantages that:
The present invention can be in real time, the linearity of calibrating wide-band VCO effectively, and the linear frequency modulation continuous wave signal that VCO is produced has the high linearity, guarantees the precision of range finding.
Accompanying drawing explanation
Fig. 1 is millimeter wave antenna array calibration structural representation.
Embodiment
An object of the present invention is to provide the real-time calibration method of a kind of broadband VCO linearity, can be in real time, the linearity of calibrating wide-band VCO effectively, the linear frequency modulation continuous wave signal that VCO is produced has the high linearity, guarantees the precision of range finding.
The present invention is achieved by the following technical solutions: utilize VCO to produce the principle of linear frequency modulation continuous wave signal range finding, the VCO output signal of high-frequency wideband is converted to the signal of low frequency and narrow bandwidth, the information of the information that has comprised distance in this signal and VCO nonlinearity erron, by outside reference source, can reject range information, utilize phase discriminator that phase error signal is converted to the modulation voltage that voltage error signal removes to control VCO, complete the real time calibration of the VCO linearity.
The real-time calibration method concrete steps of a kind of broadband VCO linearity are as follows:
The first step: by the signal f of VCO output
0(t) carry out that merit is divided and time delay.
Under the driving of desirable linear voltage, the frequency of oscillation of exporting for a broadband VCO can be expressed as
Wherein, in the cycle that T is modulation signal, B is the bandwidth of VCO output signal, f
e(t) be frequency error signal.This signal is divided into two paths of signals ，Yi road signal by coupler and directly exports, another road signal carries out merit and divides, and the two paths of signals after merit is divided is not time delay and time delay τ respectively.The phase meter of time delayed signal is not shown
Wherein, θ
vCOinitial phase for VCO.Phase place after time delay is
Second step: by two paths of signals mixing and filtering.
Signal after time delay and not time delayed signal obtain difference frequency signal phase place and are after frequency mixer and filter
The 3rd step: utilize reference source to propose
in phase error signal.
The frequency of choosing reference source is
its phase place is
Wherein, θ
rEFit is the initial phase of reference source.
with
after mixing, export
The 4th step: phase error signal is converted to voltage control signal FEEDBACK CONTROL VCO.
By phase discriminator, error phase signal is converted to error voltage signal
First is DC terms, can remove, and second is error frequency item, due to τ T, can be similar to
v
d=2πK
Dτf
e(t)---(8)
The output voltage of phase discriminator is proportional to the frequency shift (FS) function f of VCO output
e(t), the output of phase discriminator is removed to revise modulation voltage v through loop filter
r, and then control the linearity curve of VCO, through iterating repeatedly, can effectively improve the linearity.
Another object of the present invention is to provide the real-time calibration system of a kind of broadband VCO linearity, and this calibration system comprises VCO1 to be calibrated, power splitter 2, constant time lag device 3, frequency mixer 4, low pass filter 5, phase discriminator 6, reference source 7, loop filter 8, adder 9.The signal of described VCO1 output is coupled, one road signal is directly exported, another road signal is input to power splitter 2, by power splitter 2 output two paths of signals, two paths of signals Zhong mono-tunnel is directly delivered to the local oscillator port of frequency mixer 4, the signal on another road is delivered to the input port of frequency mixer 4 after by delayer 3, phase discriminator 6 carries out phase demodulation by the output signal of frequency mixer 4 by low pass filter 5 signal rear and reference source 7, signal after phase demodulation obtains the phase error corresponding voltage control signal of VCO by loop filter 8, this controls voltage signal by the modulated voltage signal of adder 9 FEEDBACK CONTROL VCO, complete the real time calibration of the VCO linearity.
Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technical scheme that can record each embodiment on the basis of specification of the present invention, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. a real-time calibration method for the broadband VCO linearity, is characterized in that, this calibration steps comprises the steps:
S1. the signal of VCO output is carried out to merit is divided and time delay, obtain two-way not time delay and delay time signal;
S2. step 1 two-way not time delay and delay time signal carry out mixing and filtering, obtain difference frequency signal;
S3. determine the phase error signal of reference source;
S4. described phase error signal is converted to voltage control signal FEEDBACK CONTROL VCO.
2. the real-time calibration method of a kind of broadband according to claim 1 VCO linearity, is characterized in that, the phase place of described not delay time signal is
3. the real-time calibration method of a kind of broadband according to claim 1 VCO linearity, is characterized in that, the phase place of described delay time signal is
4. the real-time calibration method of a kind of broadband according to claim 1 VCO linearity, is characterized in that, described difference frequency signal phase place is
5. the real-time calibration system of a broadband VCO linearity, it is characterized in that, this calibration system comprises VCO, power splitter, delayer, frequency mixer, low pass filter, phase discriminator and loop filter and adder, the signal of described VCO output is input to power splitter, by power splitter, export two paths of signals, two paths of signals Zhong mono-tunnel is directly delivered to the local oscillator port of frequency mixer, the signal on another road is delivered to the input port of frequency mixer after by time delay, phase discriminator carries out phase demodulation with reference source signal by the output signal of frequency mixer after by low pass filter, signal after phase demodulation obtains the phase error corresponding voltage control signal of VCO by loop filter, this controls voltage signal by the modulated voltage signal of adder FEEDBACK CONTROL VCO, complete the real time calibration of the VCO linearity.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006736A (en) * | 2015-05-08 | 2015-10-28 | 上海交通大学 | Frequency modulated continuous wave (FMCW) frequency sweep non-leaner calibration system based on closed loop control and FMCW frequency sweep non-leaner calibration method based on closed loop control |
| CN105406861A (en) * | 2015-11-05 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | Broadband voltage-controlled oscillator preset voltage fitting method |
| CN105721076A (en) * | 2016-01-20 | 2016-06-29 | 电子科技大学 | Time delay calibrating device facing coherent vector signal generating system and time delay calibrating method |
| CN109787561A (en) * | 2019-01-30 | 2019-05-21 | 北京智芯微电子科技有限公司 | The generator of linear FM signal |
| CN110958014A (en) * | 2019-11-29 | 2020-04-03 | 电子科技大学 | Low-phase-noise anti-vibration crystal oscillator |
| CN111404006A (en) * | 2020-03-20 | 2020-07-10 | 北京理工大学 | Noise suppression method based on phase continuous frequency sweeping fiber laser |
| CN113608176A (en) * | 2021-08-23 | 2021-11-05 | 湖南迈克森伟电子科技有限公司 | Self-adaptive cancellation circuit of frequency modulation continuous wave radar |
| CN113608106A (en) * | 2021-08-04 | 2021-11-05 | 湖南迈克森伟电子科技有限公司 | Circuit and method for rapidly detecting VCO (voltage controlled oscillator) tuning sensitivity |
| CN117278026A (en) * | 2023-10-09 | 2023-12-22 | 湖南迈克森伟电子科技有限公司 | Radio frequency self-calibration method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006736A (en) * | 2015-05-08 | 2015-10-28 | 上海交通大学 | Frequency modulated continuous wave (FMCW) frequency sweep non-leaner calibration system based on closed loop control and FMCW frequency sweep non-leaner calibration method based on closed loop control |
| CN105406861A (en) * | 2015-11-05 | 2016-03-16 | 中国电子科技集团公司第四十一研究所 | Broadband voltage-controlled oscillator preset voltage fitting method |
| CN105406861B (en) * | 2015-11-05 | 2018-08-10 | 中国电子科技集团公司第四十一研究所 | A kind of wideband voltage controlled oscillator preset voltage approximating method |
| CN105721076A (en) * | 2016-01-20 | 2016-06-29 | 电子科技大学 | Time delay calibrating device facing coherent vector signal generating system and time delay calibrating method |
| CN109787561A (en) * | 2019-01-30 | 2019-05-21 | 北京智芯微电子科技有限公司 | The generator of linear FM signal |
| CN110958014B (en) * | 2019-11-29 | 2023-10-20 | 电子科技大学 | Low phase noise anti-vibration type crystal oscillator |
| CN110958014A (en) * | 2019-11-29 | 2020-04-03 | 电子科技大学 | Low-phase-noise anti-vibration crystal oscillator |
| CN111404006A (en) * | 2020-03-20 | 2020-07-10 | 北京理工大学 | Noise suppression method based on phase continuous frequency sweeping fiber laser |
| CN113608106A (en) * | 2021-08-04 | 2021-11-05 | 湖南迈克森伟电子科技有限公司 | Circuit and method for rapidly detecting VCO (voltage controlled oscillator) tuning sensitivity |
| CN113608106B (en) * | 2021-08-04 | 2022-09-13 | 湖南迈克森伟电子科技有限公司 | Circuit and method for rapidly detecting VCO (voltage controlled oscillator) tuning sensitivity |
| CN113608176A (en) * | 2021-08-23 | 2021-11-05 | 湖南迈克森伟电子科技有限公司 | Self-adaptive cancellation circuit of frequency modulation continuous wave radar |
| CN117278026A (en) * | 2023-10-09 | 2023-12-22 | 湖南迈克森伟电子科技有限公司 | Radio frequency self-calibration method |
| CN117278026B (en) * | 2023-10-09 | 2024-05-10 | 湖南迈克森伟电子科技有限公司 | Radio frequency self-calibration method |
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Application publication date: 20140312 |