CN109347549B - High-bandwidth radio frequency signal arrival time measuring device and method - Google Patents
High-bandwidth radio frequency signal arrival time measuring device and method Download PDFInfo
- Publication number
- CN109347549B CN109347549B CN201810941865.6A CN201810941865A CN109347549B CN 109347549 B CN109347549 B CN 109347549B CN 201810941865 A CN201810941865 A CN 201810941865A CN 109347549 B CN109347549 B CN 109347549B
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- frequency signal
- signal
- laser pulse
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
The invention provides a device for measuring the arrival time of a high-bandwidth radio frequency signal, which comprises: the electro-optical modulator is connected with the radio frequency signal to be detected; the reference signal source comprises a femtosecond laser and a low-noise radio frequency signal source, wherein the femtosecond laser is connected with the electro-optical modulator and is positioned in a phase-locked loop; the low-noise radio frequency signal source is connected to the input end of the phase-locked loop; and the photoelectric detector is connected with the electro-optical modulator. According to the high-bandwidth radio frequency signal arrival time measuring device, the extremely-low-noise femtosecond laser is locked to the low-noise radio frequency source through the phase-locked loop technology, the reference signal source with excellent noise performance is used for modulating the radio frequency signal to be measured through the electro-optical modulator, arrival time information can be demodulated only by measuring the amplitude of the modulated signal, and therefore high-precision time measurement resolution is achieved; and the laser pulse train is less influenced by external interference in the transmission process, so that the introduced external noise is less.
Description
Technical Field
The invention relates to a time measuring method, in particular to a method for measuring the arrival time of a high-bandwidth radio frequency signal.
Background
With the development of scientific technology, especially in the field of accelerators (synchrotron radiation light sources, free electron lasers, linear colliders and the like), phased array radars, radio telescope clusters and the like, the requirement on the signal arrival time measurement resolution is increasingly increased.
There are two main methods of signal time of arrival measurement at present.
One of them is as shown in fig. 1, mixing the rf signal to be measured and another known common-frequency low-noise rf reference signal source 1 ' through a mixer 2 ', filtering out the sum frequency signal through a low-pass filter 3 ', only leaving the difference frequency signal, i.e. the baseband signal, and measuring the arrival time signal of the rf signal to be measured by sampling the baseband digital, and its principle formula is as follows:
the radio frequency signal to be detected is as follows: u shapeMeasuring＝VMeasuring*sin(2πft+φ)，VMeasuringThe maximum amplitude of the radio frequency signal to be detected is obtained;
common-frequency low-frequency noise radio frequency reference signal: u shapeReference to＝VReference to*sin(2πft)，VReference toThe maximum amplitude of the same-frequency low-frequency noise radio frequency reference signal;
mixing the two to obtain:
Umeasuring*UReference to＝VMeasuring*sin(2πft+φ)*VReference to*sin(2πft)
＝1/2 *VMeasuring*VReference to(cos(φ)-cos((2*2πft)+φ)),
Wherein cos ((2 x 2 pi ft) + phi) is directly filtered out by adding a low-pass filter, so that a baseband signal is finally obtained without consideration; u shapeMeasuring*UReference to＝1 /2 *VMeasuring*VReference to*cos(φ)，UMeasuring*UReference toCan be directly measured by an analog-to-digital converter, VMeasuringAnd VReference toIs also measured directly, in units of V, so phi can be measured by an inverse trigonometric function:
φ＝arcos[Umeasuring*UReference to/(1 /2 *VMeasuring*VReference to)]Phi corresponds to the time arrival information.
The method has the disadvantages that a radio frequency reference signal source with known same frequency and low noise performance is needed, and the requirement on the signal source is high.
Another method is as shown in fig. 2, which is a method of IQ detection, mixing a radio frequency signal to be measured with another known low-noise radio frequency reference signal source 1 "with a determined frequency by a mixer 2", filtering a difference frequency signal by a low pass filter 3 ", leaving only an intermediate frequency signal, sampling the intermediate frequency signal by an analog-to-digital converter with a sampling clock 4 times as much as the intermediate frequency signal, then performing quadrature demodulation to obtain two quadrature components, and then dividing the two quadrature components by the arrival time information of the measured signal, wherein the principle formula is as follows:
the radio frequency signal to be detected is as follows: u shapeMeasuring＝VMeasuring*sin(2πf0t+φ)，VMeasuringThe maximum amplitude of the radio frequency signal to be detected is obtained;
determining a frequency low noise radio frequency reference signal: u shapeReference to＝VReference to*sin(2π(f0-fIF)t+θ)，VReference toDetermining the maximum amplitude of the frequency low-frequency noise radio frequency reference signal;
mixing the two to obtain:
Umeasuring*UReference to＝VMeasuring*sin(2πf0t+φ)*VReference to*sin(2π(f0-fIF)
＝1/2 *VMeasuring*VReference to{cos(2*2πfIFt+φ-θ)-cos[2π(2f0-fIF)t+φ-θ]},
Wherein cos [2 π (2 f)0-fIF)t+φ-θ]This is not considered because a low pass filter is added to filter out the signal directly, and finally 1/2V is obtainedMeasuring*VReference to*cos(2*2πfIFt + phi-theta) and then 4 times fIFThe sampling clock of the analog-to-digital converter takes samples A once every quarter period1，A2，A3，A4Four values, wherein
I＝1/2(A1-A3),Q＝1/2(A2-A4) Therefore, tan (phi-theta) ═ Q/I ═ a2-A4)/(A1-A3) The value of θ is the initial phase value of the common-frequency low-noise rf reference signal, which can be actually set to 0, i.e., Φ - θ is equal to Φ, which is the arrival time of the measured signal.
Because the low-noise radio frequency signal source has better performance in a low frequency band and has poorer performance in a high frequency band, the performance limit of the low-noise radio frequency signal source can influence the final resolution of the measurement of the arrival time of the measured signal; on the other hand, the clock jitter performance of the input clock of the analog-to-digital converter will also affect the resolution of the measured signal arrival time measurement.
In summary, the prior art has a disadvantage that it is necessary to provide a radio frequency reference signal source with low noise performance, the noise performance of the reference signal source will limit the arrival time measurement resolution of the radio frequency signal to be measured, while the low frequency band (1Hz to 1KHz) of the existing reference signal source has better noise performance, and the high frequency band (1KHz to 10MHz) has worse performance. In order to solve the problems in the prior art, the invention aims to provide a practical and feasible method for measuring the arrival time of a high-bandwidth radio-frequency signal with high resolution.
Disclosure of Invention
The invention aims to provide a device and a method for measuring the arrival time of a high-bandwidth radio-frequency signal based on an electro-optical modulation scheme, so as to overcome the limitation of a reference signal source on time measurement resolution due to poor performance in a high frequency band and improve the time measurement resolution.
In order to achieve the above object, the present invention provides a high bandwidth rf signal arrival time measuring apparatus for detecting an arrival time of a rf signal to be measured, comprising: the electro-optical modulator is provided with an optical signal input end, an electrical signal input end and an optical signal output end, wherein the electrical signal input end is connected with a radio-frequency signal to be detected; the reference signal source comprises a femtosecond laser and a low-noise radio frequency signal source, wherein the femtosecond laser is connected with the optical signal input end and is positioned in a phase-locked loop; the low-noise radio frequency signal source is connected to the input end of the phase-locked loop; and the photoelectric detector is connected with the optical signal output end.
An optical delay line is arranged between the optical signal input end and the femtosecond laser.
And a phase shifter is arranged between the electric signal input end and the radio-frequency signal to be detected.
The electro-optical modulator is an electro-optical intensity modulator or an electro-optical phase modulator.
In another aspect, the present invention further provides a method for measuring arrival time of a high bandwidth radio frequency signal, including: step S1: building a high-bandwidth radio frequency signal arrival time measuring device according to the above; step S2: the femtosecond laser and the low-noise radio frequency signal source are started, the femtosecond laser is locked on the low-noise radio frequency signal source through a phase-locked loop technology, the femtosecond laser outputs a laser pulse array after phase locking, and a radio frequency signal to be detected is modulated by the electro-optical modulator; the radio frequency signal to be detected is homologous with the low-noise radio frequency signal source; step S3: adjusting the relative time delay of the laser pulse array after phase locking and a radio frequency signal to be detected, acquiring signal amplitudes under different relative time delays by using a photoelectric detector, obtaining a change relation graph of the signal amplitudes along with the relative time delay, finding out a maximum slope point, determining a linear region containing the maximum slope point, sampling the signal amplitudes corresponding to each relative time delay point in the linear region containing the maximum slope point for multiple times, taking the average value, obtaining a linear fitting curve of the region, and calculating a slope parameter K of the linear fitting curve; step S5: adjusting the relative time delay of the laser pulse array after phase locking and the radio frequency signal to be detected, aligning a certain pulse of the laser pulse array to the maximum slope point in the step S3, and recording the laser pulse aligned to the maximum slope point as an initial working laser pulse; step S5: and measuring the signal amplitude corresponding to the subsequent laser pulse of the initial working laser pulse, and calculating the arrival time t of the radio frequency signal to be measured corresponding to the subsequent laser pulse according to the signal amplitude deviation value of the initial working laser pulse relative to the maximum slope point and the slope parameter K in the step S3.
The step S1 further includes: arranging a phase shifter between an electric signal input end of the high-bandwidth radio-frequency signal arrival time measuring device and a radio-frequency signal to be measured; and the step S3 and the step S4 both adjust the relative time delay between the phase-locked laser pulse array and the radio frequency signal to be measured through the phase shifter.
The step S1 further includes: an optical delay line is arranged between the optical signal input end and the femtosecond laser; and the step S3 and the step S4 both adjust the relative time delay between the phase-locked laser pulse array and the radio frequency signal to be measured through an optical delay line.
The slope parameter K of the maximum slope point is calculated by the following formula:
wherein, Δ t is the time delay from the maximum slope point to the adjacent measurement point, and the unit is fs, and Δ v is the difference between the maximum slope point and the signal amplitude of the adjacent measurement point, and the unit is mV.
The arrival time t of the radio frequency signal to be measured is calculated by the following formula: t ═ K ═ Δ VDeflectionWherein K is the slope parameter of the maximum slope point, and the unit is fs/mV, delta VDeflectionThe signal amplitude offset value for the latter laser pulse relative to the point of maximum slope is given in mV.
The high-bandwidth radio frequency signal arrival time measuring device locks the extremely-low noise femtosecond laser to the low-noise radio frequency source through the phase-locked loop technology to provide the laser pulse array combined with the respective superior frequency band performance of the two instruments as a reference signal source, the noise performance of the high-bandwidth radio frequency signal arrival time measuring device is superior to that of the prior art, the radio frequency signal to be measured is modulated by the electro-optical modulator to the reference signal source, arrival time information can be demodulated only by measuring the amplitude of the modulated signal, and therefore high-precision time measurement resolution is achieved; and in the process of transmitting the laser pulse train, compared with the process of directly transmitting the radio frequency signal by using a radio frequency cable, the influence of external interference is smaller, so that the introduced external noise is smaller. In addition, in the process of electro-optical intensity modulation, the high-bandwidth radio-frequency signal arrival time measuring method adopts coarse adjustment of the phase shifter and fine adjustment of the optical delay line to calibrate the modulated laser pulse to be always near the zero crossing point of the radio-frequency signal to be measured, so that the time resolution is higher.
Drawings
FIG. 1 is a schematic diagram of a prior art method of measuring the time of arrival of a signal;
FIG. 2 is a schematic diagram of another prior art method of signal time of arrival measurement;
FIG. 3 is a graph comparing the noise performance of a radio frequency signal source and a femtosecond laser;
FIG. 4 is a schematic diagram of a high bandwidth radio frequency signal time of arrival measurement apparatus according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of the time delay adjustment of the high bandwidth RF signal arrival time measuring apparatus shown in FIG. 4;
fig. 6 is a time-of-arrival measurement schematic of the high bandwidth rf signal time-of-arrival measurement apparatus shown in fig. 4.
Detailed Description
The following description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will provide a better understanding of the function and features of the invention.
Fig. 4 shows a high-bandwidth rf signal arrival time measuring apparatus according to an embodiment of the present invention, which is based on an electro-optical modulation scheme and is used for detecting an arrival time of an rf signal to be measured, and includes an electro-optical modulator 1, a reference signal source, a photodetector 4, an optical delay line 5, and a phase shifter 6. In this embodiment, the electro-optical modulator 1 is an electro-optical intensity modulator, which is used for modulating the amplitude of the laser pulse array and has an optical signal input end 11, an electrical signal input end 12 and an optical signal output end 13, the optical signal input end 11 is connected to a reference signal source, the electrical signal input end 12 is connected to a radio frequency signal to be detected, and the optical signal output end 13 is connected to the photodetector 4.
The reference signal source comprises a femtosecond laser 2 and a low-noise radio frequency signal source 3, the femtosecond laser 2 is connected with the optical signal input end 11 and is positioned in a phase-locked loop, and the low-noise radio frequency signal source 3 is connected with the input end of the phase-locked loop. The femtosecond laser 1 is a commercially available femtosecond laser with extremely low noise, the laser has good noise performance in a high-frequency band, and the frequency of the radio-frequency signal source 3 is from several KHz to several tens of GHz. As shown in fig. 3, the noise performance of the low-noise rf signal source 3 in the low frequency band is better than that of the femtosecond laser 2, and the noise performance of the low-noise rf signal source 3 in the high frequency band is inferior to that of the femtosecond laser 2, so that after the femtosecond laser 2 is locked to the low-noise rf signal source 3 by the phase-locked loop technique, a laser pulse array with lower noise can be obtained, and the obtained period of the phase-locked laser pulse array has a whole period relationship with the period of the rf signal to be detected, so that the laser pulse can be aligned to the maximum slope point of the rf signal to be detected.
The optical delay line 5 is arranged between the optical signal input end 11 and the femtosecond laser 2, the phase shifter 6 is arranged between the electrical signal input end 12 and the radio frequency signal to be measured, and the optical delay line 5 and the phase shifter 6 are used for adjusting the relative time delay of the radio frequency signal to be measured and the laser pulse array.
Based on the device, the invention provides a method for measuring the arrival time of the high-bandwidth radio frequency signal.
Step S1: building a high-bandwidth radio frequency signal arrival time measuring device according to the above, arranging a phase shifter 6 between an electric signal input end 12 and a radio frequency signal to be measured, and arranging an optical delay line 5 between an optical signal input end 11 and the femtosecond laser 2;
step S2: the femtosecond laser 2 and the low-noise radio frequency signal source 3 are started, the femtosecond laser 2 is locked on the low-noise radio frequency signal source 3 through a phase-locked loop technology, the femtosecond laser outputs a laser pulse array after phase locking, and a radio frequency signal to be detected is modulated into the laser pulse array after phase locking through the electro-optical modulator 1; the radio frequency signal to be detected is homologous with the low-noise radio frequency signal source 3, and the arrangement enables the laser pulse array after phase locking to have a whole period relation with the period of the radio frequency signal to be detected.
Step S3: and adjusting the relative time delay of the laser pulse array after phase locking and the radio frequency signal to be detected by adopting an optical extension line 5 and a phase shifter 6, acquiring signal amplitudes under different relative time delays by using a photoelectric detector 4, obtaining a change relation graph of the signal amplitudes along with the relative time delays, finding out a maximum slope point, and determining a linear region containing the maximum slope point. Due to the self time jitter of the signal to be detected, the signal amplitude corresponding to each relative delay point is sampled for multiple times in a linear region containing the maximum slope point and averaged, so that a linear fitting curve of the region is obtained and the slope parameter K of the region is calculated, and the error of the calculated K value caused by the self time jitter of the signal to be detected is reduced.
Because the variation relationship of the signal amplitude along with the relative time delay can reflect the waveform of the radio frequency signal to be detected along with the time, the maximum slope point also corresponds to the maximum slope parameter of the radio frequency signal to be detected, and the maximum slope parameter is a corresponding relationship of the scanning time corresponding to the signal amplitude in a small interval range (approximate linear relationship, ps magnitude) near the maximum slope point.
The slope parameter K is calculated by the following formula:
the unit of the slope parameter K is fs/mV, the unit of Δ t is the time delay from the maximum slope point to the adjacent measurement point, the unit of fs is Δ v is the difference value of the signal amplitude of the maximum slope point and the adjacent measurement point, and the unit of Δ v is mV.
The change value of the relative time delay adjusted by the optical extension line 5 and the phase shifter 6 is known, and the change relation of the laser pulse amplitude along with the relative time delay can be reflected by the change relation of the signal amplitude along with the relative time delay obtained by scanning by adjusting the optical extension line 5 and the phase shifter 6, so that the waveform of the radio frequency signal to be measured along with the time change is reflected. Wherein, the minimum change unit of the optical delay line is 1fs, and the resolution is 1 fs; the minimum unit of change of the phase shifter is 30fs, and the resolution is 30 fs.
Step S4: as shown in fig. 5, the optical delay line 5 and the phase shifter 6 are used to adjust the relative time delay between the phase-locked laser pulse array and the rf signal to be measured, align a certain pulse of the laser pulse array with the maximum slope point described in step S3, and mark the laser pulse aligned with the maximum slope point as the initial working laser pulse.
Step S5: and measuring the signal amplitude corresponding to the subsequent laser pulse of the initial working laser pulse, and calculating the arrival time t of the radio frequency signal to be measured corresponding to the subsequent laser pulse according to the signal amplitude deviation value of the initial working laser pulse relative to the maximum slope point and the slope parameter K in the step S3.
The measurement principle of the arrival time of the radio frequency signal to be measured is as follows: the arrival time change of the radio frequency signal of the subsequent period modulates the laser pulse of the subsequent period through the electro-optical modulator 1, so as to convert the change reflected on the amplitude of the laser pulse, as shown in fig. 6, if the waveform of a certain period of the radio frequency signal to be detected is as shown in the figure, and if the arrival time of the subsequent radio frequency signal to be detected is ahead of the initial working laser pulse, the amplitude of the correspondingly modulated laser pulse becomes smaller, and if the arrival time of the subsequent radio frequency signal to be detected is behind the initial working laser pulse, the amplitude of the correspondingly modulated laser pulse becomes larger; the change of the arrival time of the corresponding radio frequency signal to be detected can be reversely deduced by directly measuring the change of the subsequent laser pulse amplitude relative to the initial working laser pulse amplitude. Whereby the laser pulse is used as a starting laser pulse by rescanning the laser pulse through a delay to a corresponding point of maximum slope, such thatThe subsequent signal amplitude deviation of the laser pulse relative to the maximum slope point is converted into the laser pulse amplitude change through the electro-optical modulator 1 and then converted into a signal amplitude deviation value delta V through the photoelectric detector 4DeflectionIn mV,. DELTA.VDeflectionCan be measured on the photodetector 4 by an analog-to-digital converter.
Thus, the arrival time t is calculated by the following formula:
t＝K*ΔVdeflection，
Wherein K is the slope parameter of the maximum slope point, and the unit is fs/mV, delta VDeflectionThe signal amplitude offset value for the latter laser pulse relative to the point of maximum slope is given in mV.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. For example, the electro-optic modulator of the present invention may also replace the electro-optic intensity modulator with an electro-optic phase modulator. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (5)
1. A high bandwidth rf signal time-of-arrival measuring apparatus for detecting a time-of-arrival of a rf signal to be measured, comprising:
the electro-optical modulator (1), the electro-optical modulator (1) has an optical signal input end (11), an electrical signal input end (12) and an optical signal output end (13), the electrical signal input end (12) is connected with the radio frequency signal to be measured;
the reference signal source comprises a femtosecond laser (2) and a low-noise radio frequency signal source (3), wherein the femtosecond laser (2) is connected with the optical signal input end (11) and is positioned in a phase-locked loop; the low-noise radio frequency signal source (3) is connected to the input end of the phase-locked loop; the femtosecond laser is set to output a phase-locked laser pulse array, a radio frequency signal to be detected is homologous with the low-noise radio frequency signal source (3), and the period of the phase-locked laser pulse array and the period of the radio frequency signal to be detected have a whole period relationship due to the setting;
the photoelectric detector (4) is connected with the optical signal output end (13);
an optical delay line (5) is arranged between the optical signal input end (11) and the femtosecond laser (2);
and a phase shifter (6) is arranged between the electric signal input end (12) and the radio frequency signal to be detected.
2. The high bandwidth radio frequency signal arrival time measuring device according to claim 1, wherein the electro-optical modulator (1) is an electro-optical intensity modulator or an electro-optical phase modulator.
3. A method for measuring time of arrival of a high bandwidth radio frequency signal, comprising:
step S1: building a high-bandwidth radio frequency signal arrival time measuring device according to claim 1; the step S1 includes: a phase shifter (6) is arranged between an electric signal input end (12) of the high-bandwidth radio-frequency signal arrival time measuring device and a radio-frequency signal to be measured; an optical delay line (5) is arranged between an optical signal input end (11) and the femtosecond laser (2);
step S2: the femtosecond laser (2) and the low-noise radio frequency signal source (3) are started, the femtosecond laser (2) is locked on the low-noise radio frequency signal source (3) through a phase-locked loop technology, the femtosecond laser outputs a laser pulse array after phase locking, and a radio frequency signal to be detected is modulated into the laser pulse array after phase locking through the electro-optical modulator (1); the radio frequency signal to be detected is homologous with the low-noise radio frequency signal source (3), and the period of the laser pulse array after phase locking and the period of the radio frequency signal to be detected have a whole period relationship through the arrangement;
step S3: adjusting the relative time delay of the laser pulse array after phase locking and a radio frequency signal to be detected, acquiring signal amplitudes under different relative time delays by using a photoelectric detector (4), obtaining a change relation graph of the signal amplitudes along with the relative time delay, finding out a maximum slope point, determining a linear region containing the maximum slope point, sampling the signal amplitudes corresponding to each relative time delay point in the linear region containing the maximum slope point for multiple times, taking the average value, obtaining a linear fitting curve of the region, and calculating a slope parameter K of the linear fitting curve;
step S4: adjusting the relative time delay of the laser pulse array after phase locking and the radio frequency signal to be detected, aligning a certain pulse of the laser pulse array to the maximum slope point in the step S3, and recording the laser pulse aligned to the maximum slope point as an initial working laser pulse;
step S5: measuring the signal amplitude corresponding to the subsequent laser pulse of the initial working laser pulse, and calculating the arrival time t of the radio frequency signal to be measured corresponding to the subsequent laser pulse according to the signal amplitude deviation value of the subsequent laser pulse relative to the maximum slope point and the slope parameter K in the step S3;
the step S3 and the step S4 adjust the relative time delay between the phase-locked laser pulse array and the radio frequency signal to be detected through a phase shifter (6); and the step S3 and the step S4 adjust the relative time delay between the phase-locked laser pulse array and the radio frequency signal to be measured through an optical delay line (5).
4. The method according to claim 3, wherein the slope parameter K at the maximum slope point is calculated by the following formula:
wherein, Δ t is the time delay from the maximum slope point to the adjacent measurement point, and the unit is fs, and Δ v is the difference between the maximum slope point and the signal amplitude of the adjacent measurement point, and the unit is mV.
5. The method according to claim 4, wherein the arrival time t of the RF signal to be measured is calculated by the following formula:
t＝K*ΔVdeflection，
Wherein K is the slope parameter of the maximum slope point, and the unit is fs/mV, delta VDeflectionFor the latter laser pulse phaseThe signal amplitude offset value for the point of maximum slope is given in mV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941865.6A CN109347549B (en) | 2018-08-17 | 2018-08-17 | High-bandwidth radio frequency signal arrival time measuring device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810941865.6A CN109347549B (en) | 2018-08-17 | 2018-08-17 | High-bandwidth radio frequency signal arrival time measuring device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109347549A CN109347549A (en) | 2019-02-15 |
| CN109347549B true CN109347549B (en) | 2020-11-06 |
Family
ID=65291746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810941865.6A Active CN109347549B (en) | 2018-08-17 | 2018-08-17 | High-bandwidth radio frequency signal arrival time measuring device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109347549B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112379335B (en) * | 2020-11-13 | 2024-07-26 | 清源智翔(重庆)科技有限公司 | Arrival time measuring method based on amplitude difference information |
| CN115037363B (en) * | 2022-06-02 | 2024-02-02 | 中国科学院上海高等研究院 | Electron beam arrival time measuring device based on balanced light pulse |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100831A (en) * | 1998-06-30 | 2000-08-08 | The United States Of America As Represented By The Secretary Of The Navy | Optoelectronic analog-to-digital converter using wavelength division multiplexing |
| CN104980222A (en) * | 2015-07-16 | 2015-10-14 | 北京邮电大学 | Time transfer device and method |
| CN207250927U (en) * | 2017-10-13 | 2018-04-17 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3061124B2 (en) * | 1997-09-25 | 2000-07-10 | 日本電気株式会社 | Optical fiber transmission line measurement method |
| EP3180873B1 (en) * | 2015-04-20 | 2018-03-07 | Instituto de Telecomunicações | Photonic beamforming system for a phased array antenna receiver |
| CN107611759A (en) * | 2017-10-13 | 2018-01-19 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device and method |
-
2018
- 2018-08-17 CN CN201810941865.6A patent/CN109347549B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100831A (en) * | 1998-06-30 | 2000-08-08 | The United States Of America As Represented By The Secretary Of The Navy | Optoelectronic analog-to-digital converter using wavelength division multiplexing |
| CN104980222A (en) * | 2015-07-16 | 2015-10-14 | 北京邮电大学 | Time transfer device and method |
| CN207250927U (en) * | 2017-10-13 | 2018-04-17 | 中国科学院上海应用物理研究所 | A kind of laser phase-locking device |
Non-Patent Citations (2)
| Title |
|---|
| A SUB 100 FS ELECTRON BUNCH ARRIVAL-TIME MONITOR SYSTEM FOR FLASH;F.Loehl,etal.;《Proceedings of EPAC 2006,Edinburgh,Scotland》;20060630;第2781-2783页 * |
| A SUB-50 FEMTOSECOND BUNCH ARRIVAL TIME MONITOR SYSTEM FOR FLASH;F.Loehl,etal.;《Proceedings of DIPAC 2007,Venice,Italy》;20070523;第262-264页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109347549A (en) | 2019-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110031832B (en) | Microwave photon Doppler frequency shift measurement system and adjusting method thereof | |
| US20080239281A1 (en) | Absolute distance meter | |
| CN101551419B (en) | Method and system for detecting phase noise | |
| CN110017967B (en) | Phase comparison-based chirp parameter testing method for electro-optic intensity modulator | |
| US20070236230A1 (en) | Vector network analysis system and method using offset stimulus signals | |
| GB2125960A (en) | Measuring magnetic field | |
| US12003272B2 (en) | Timing measurement apparatus | |
| CN108957123B (en) | Based on frequency-phase slope mapping microwave frequency measuring method and device | |
| CN109347549B (en) | High-bandwidth radio frequency signal arrival time measuring device and method | |
| WO2008072481A1 (en) | Radar apparatus | |
| US11032628B2 (en) | Electronic demodulation of optically phase demodulated signals | |
| WO2019116549A1 (en) | Ranging device and control method | |
| CN113281778A (en) | Coherent laser radar system based on optical phase lock | |
| JPH0821856A (en) | Syncyronization type signal detecting device | |
| Li et al. | Photonic-assisted approach to simultaneous measurement of frequency and angle-of-arrival | |
| CN106771688B (en) | A kind of application method of ultra wide band phase noise measuring system | |
| CN110350966B (en) | Broadband microwave signal arrival angle measuring device and method based on photon technology | |
| US11372035B2 (en) | Measurement system and method for matching and/or transmission measurements | |
| CN117031120A (en) | Device and method for monitoring microwave frequency change and absolute frequency | |
| US9673900B2 (en) | Optically synthesized tracking signal source and network analyzer using same | |
| KR20120020890A (en) | High precision distance measurement using fmcw radar | |
| CN103746953B (en) | Method and device for generating frequency-modulated wave baseband signal | |
| US10771076B1 (en) | Measuring device, calibration method and measuring method with jitter compensation | |
| US20050151956A1 (en) | Apparatus for precise distance measurement | |
| JPH0693025B2 (en) | FM-CW distance measurement method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |