CN106054139A - Data acquisition method and device - Google Patents
Data acquisition method and device Download PDFInfo
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- CN106054139A CN106054139A CN201610384271.0A CN201610384271A CN106054139A CN 106054139 A CN106054139 A CN 106054139A CN 201610384271 A CN201610384271 A CN 201610384271A CN 106054139 A CN106054139 A CN 106054139A
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
An embodiment of the invention discloses a data acquisition method and a data acquisition device. The data acquisition method comprises the steps of: delaying a pre-formed pulse recurrence frequency PRF pulse signal by preset delay time when detecting that initial data jitter exists in pre-acquired echo data; and taking a falling edge moment of the delayed PRF pulse signal as the starting moment of sampling periods, and acquiring pre-formed sample data in each sampling period, wherein the sample data acquired in one sampling period forms a frame of echo data.
Description
Technical field
The present invention relates to data acquisition technology field, particularly relate to a kind of collecting method and device.
Background technology
Satellite-borne synthetic aperture radar (Synthetic Aperture Radar, SAR) is a kind of with satellite as carrier platform
Earth observation technology, be used for obtaining the high-resolution radar image of ground object, SAR is the great prominent of modern radar technology
Broken, it is obtained in fields such as military affairs investigation, geologic prospecting, the condition of a disaster prospecting and remote sensing fields and is widely applied.
In SAR system, data shaper may include that modulus (A/D) transducer and field programmable gate array
(Field-Programmable Gate Array, FPGA).Fig. 1 is the composition structural representation of available data shaper, such as figure
Shown in 1, preformed analog echo signal and sampling clock are separately input to A/D converter, carry out mould through A/D converter
After number conversion, form sampled data and with road clock；Then by sampled data with road clock, and as the initial timing of sampling
Pulse recurrence frequency (Pulse Recurrence Frequency, the PRF) signal of pulse is input in FPGA together.Fig. 2 is
Existing PRF pulse signal, sequential relationship schematic diagram with road clock and sampled data, as in figure 2 it is shown, FPGA is with PRF pulse
Sampled data, as the initial time in sampling period, is being adopted by the trailing edge moment of signal with the rising edge time of road clock
Collection, the quantitative data collected within a sampling period forms a frame echo data, therefore, cries again with the rising edge of road clock
Do the synchronization edge of sampled data.It is to say, after the trailing edge of PRF pulse signal arrives, with first rising of road clock
The initial data that sampled data is this frame echo data collected along the moment, it follows that in Fig. 2 every frame echo data rise
Beginning data are D1.
During realizing the present invention, inventor finds that in prior art, at least there are the following problems:
Some unstable factors may be there are in SAR system, cause the trailing edge of PRF pulse signal to be ahead of with road
A rising edge before the clock first rising edge in current collection period, say, that the decline of PRF pulse signal
The synchronization edge of data D0 before the initial data D1 of the clawback data that may be ahead of present frame, causes present frame
The initial data of echo data be D0, thus cause the initial data generation data dithering in the echo data of present frame.
Summary of the invention
For solving above-mentioned technical problem, embodiment of the present invention expectation provides a kind of collecting method and device, it is possible to have
Effect the initial data in each frame echo data is avoided to shake.
The technical scheme is that and be achieved in that:
A kind of collecting method, described method includes:
When detecting that there is initial data in the echo data gathered in advance shakes, preformed pulse is repeated frequency
Rate PRF pulse delay signal predetermined time delay；
Using the initial time in trailing edge moment as the sampling period of the PRF pulse signal after delay, in each sampling week
In phase, preformed sampled data is acquired；Wherein, the sampled data composition one collected within a sampling period
Frame echo data.
In the above-described embodiments, described it is acquired including to preformed sampled data within each sampling period:
At the preformed rising edge time with road clock, described sampled data is adopted within each sampling period
Collection.
In the above-described embodiments, described PRF pulse delay signal predetermined time delay is included:
Receiving the adjustment instruction of user's input, described adjustment in instruction includes described predetermined time delay；
Instruction is adjusted by described PRF pulse delay signal predetermined time delay according to described；Wherein, during described pre-set delay
Between at half with in the clock cycle of road.
In the above-described embodiments, described according to described adjust instruction by described PRF pulse delay signal predetermined time delay
Including:
The delay circuit that instruction adjustment pre-sets is adjusted according to described；
Described PRF pulse signal is input in the delay circuit after adjusting；
Delay circuit after described adjustment is by described PRF pulse delay signal predetermined time delay.
In the above-described embodiments, described delay circuit includes: sequential time delay circuit, combination logic delay circuit and numerical control letter
Number delay device.
A kind of data acquisition unit, described device includes:
Delay cell, for when detecting that there is initial data in the echo data gathered in advance shakes, by shape in advance
The PRF pulse delay signal predetermined time delay become, sends an acquisition instructions to collecting unit；
Described collecting unit, for after receiving described acquisition instructions, with the decline of the PRF pulse signal after postponing
Along the moment as the initial time in sampling period, within each sampling period, preformed sampled data is acquired；Its
In, the sampled data collected in a collection period forms a frame echo data.
In the above-described embodiments, described collecting unit, specifically within each sampling period preformed with road
Described sampled data is acquired by the rising edge time of clock.
In the above-described embodiments, described delay cell includes:
Receive subelement, for receiving the adjustment instruction of user's input, wherein, described adjustment instruction includes described pre-
If time delay, it is sent to described adjustment instruction postpone subelement；
Described delay subelement, for adjusting instruction by described PRF pulse delay signal predetermined time delay according to described；
Wherein, described predetermined time delay at half with in the clock cycle of road.
In the above-described embodiments, described delay subelement, specifically for adjusting what instruction adjustment pre-set according to described
Delay circuit；Described PRF pulse signal is input in the delay circuit after adjusting；Delay circuit after described adjustment is by described
PRF pulse delay signal predetermined time delay.
In the above-described embodiments, described delay circuit includes: sequential time delay circuit, combination logic delay circuit and numerical control letter
Number delay device.
In the technical scheme that the embodiment of the present invention provides, there is initial data when detecting in the echo data gathered in advance
During shake, first by preformed PRF pulse delay signal predetermined time delay, then with under the PRF pulse signal after postponing
Preformed sampled data as the initial time in sampling period, was acquired within each sampling period by fall along the moment.
And in the prior art, directly preformed PRF pulse signal is input to data together with channel associate signals and sampled data
Collecting device, does not postpones PRF pulse signal, exists so the trailing edge of PRF pulse signal may be ahead of with road clock
A rising edge before first rising edge in current collection period, thus cause adopting of the initial data in echo data
Collection position is not fixing and shakes.Obviously, compared to the prior art, the embodiment of the present invention propose collecting method and dress
Putting, the initial data that can not only be effectively prevented from each frame echo data is shaken；And, it is achieved get up simple and convenient,
Being easy to popularize, the scope of application is wider.
Accompanying drawing explanation
Fig. 1 is the composition structural representation of available data shaper；
Fig. 2 is existing to there is the PRF pulse signal of initial data shake, with the sequential relationship of road clock and sampled data
Schematic diagram；
Fig. 3 be in the embodiment of the present invention collecting method realize schematic flow sheet；
Fig. 4 is the implementation method schematic flow sheet in the embodiment of the present invention by PRF pulse delay signal predetermined time delay；
Fig. 5 is according to adjusting instruction by the realization side of PRF pulse delay signal predetermined time delay in the embodiment of the present invention
Method schematic flow sheet；
Fig. 6 is the structural representation of the annexation of delay circuit and data acquisition equipment in the embodiment of the present invention；
Fig. 7 is the PRF pulse signal after postponing in the embodiment of the present invention, with the sequential relationship of road clock and sampled data
Schematic diagram；
Fig. 8 is the composition structural representation of data acquisition unit in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.
Fig. 3 be in the embodiment of the present invention collecting method realize schematic flow sheet, as it is shown on figure 3, data acquisition side
Method comprises the following steps:
Step 301, when detect the echo data gathered in advance exists initial data shake time, by preformed
PRF pulse delay signal predetermined time delay.
In a particular embodiment of the present invention, data detection method of the prior art detection can be used to gather in advance
Whether echo data exists initial data shake, when detecting, the echo data gathered in advance exists initial data shake
Time, by the preformed PRF pulse delay signal predetermined time delay being input in data acquisition equipment, wherein, described pre-
The PRF pulse signal being initially formed is for initial timing of sampling preformed sampled data.
It is preferred that described predetermined time delay can be arranged on half with the road clock cycle within, as in figure 2 it is shown, with
Time between two rising edges of road clock is the cycle of a Ge Sui road clock, for example, it is assumed that be 1 second with the road clock cycle,
Then described predetermined time delay can be set to 0.5 second.
Fig. 4 is the implementation method schematic flow sheet in the embodiment of the present invention by PRF pulse delay signal predetermined time delay,
As shown in Figure 4, the method for preformed PRF pulse delay signal predetermined time delay is comprised the following steps:
Step 301a, the adjustment instruction of reception user's input.
In a particular embodiment of the present invention, described adjustment in instruction includes predetermined time delay, and can be by institute
State predetermined time delay be arranged on half with the road clock cycle within.
Step 301b, according to adjust instruction by PRF pulse delay signal predetermined time delay.
In this step, after receiving the adjustment instruction of user's input, the pre-set delay in this adjustment instruction is first obtained
Time, further according to adjusting instruction by PRF pulse delay signal predetermined time delay.
Fig. 5 is according to adjusting instruction by the realization side of PRF pulse delay signal predetermined time delay in the embodiment of the present invention
Method schematic flow sheet, as it is shown in figure 5, according to adjusting instruction by the implementation method bag of PRF pulse delay signal predetermined time delay
Include following steps:
Step 301b_1, the delay circuit pre-set according to adjustment instruction adjustment.
In this step, can adjust, according to adjusting instruction, the delay circuit pre-set, specifically, can pass through to adjust
Delay circuit is by preformed PRF pulse delay signal predetermined time delay, for example, it is assumed that described predetermined time delay is
0.5 second, the most in this step, can be by adjusting delay circuit by preformed PRF pulse delay signal 0.5 second.At this
In the specific embodiment of invention, described delay circuit may include that sequential time delay circuit, combination logic delay circuit and numerical control letter
Number delay device.
Step 301b_2, PRF pulse signal is input to adjust after delay circuit in.
In this step, after adjusting, according to adjustment instruction, the delay circuit pre-set, PRF pulse signal is inputted
In delay circuit after adjustment.
Delay circuit after step 301b_3, adjustment is by PRF pulse delay signal predetermined time delay.
In a particular embodiment of the present invention, preformed PRF pulse signal can be prolonged by the delay circuit after adjustment
Predetermined time delay late, after the delay circuit after adjustment is to PRF pulse delay signal predetermined time delay, after postponing
PRF pulse signal is input in data acquisition equipment with road clock and sampled data with being pre-formed.The present invention's
In specific embodiment, described data acquisition equipment can be FPGA, it is also possible to be the Digital Signal Processing pre-set
(Digital Signal Processing, DSP) equipment, central processing unit (Central Processing Unit, CPU),
Special IC (Application Specific Integrated Circuit, ASIC).
In a particular embodiment of the present invention, the delay circuit pre-set described in can be arranged on data acquisition equipment
In, it is also possible to it is arranged on outside data acquisition equipment.Fig. 6 is delay circuit and the company of data acquisition equipment in the embodiment of the present invention
Connecing the structural representation of relation, wherein, Fig. 6 (a) is delay circuit and the first company of data acquisition equipment in the embodiment of the present invention
Connecing the structural representation of relation, as shown in Fig. 6 (a), the delay circuit pre-set is arranged in data acquisition equipment；Fig. 6 (b)
For delay circuit in the embodiment of the present invention and the structural representation of the second annexation of data acquisition equipment, such as Fig. 6 (b) institute
Showing, the delay circuit pre-set is arranged on outside data acquisition equipment.
According to the description above, according to above-mentioned step 301b_1～301b_3, it is possible to achieve according to adjusting instruction
PRF pulse delay signal predetermined time delay is set.
Step 302, using the initial time in trailing edge moment as sampling period of the PRF pulse signal after postponing, respectively
In the individual sampling period, preformed sampled data is acquired.
In a particular embodiment of the present invention, after by preformed PRF pulse delay signal predetermined time delay,
Data acquisition equipment can be using the initial time in trailing edge moment as the sampling period of the PRF pulse signal after postponing, data
Preformed sampled data was acquired within each sampling period by collecting device, and specifically, data acquisition equipment is permissible
Within each sampling period, preformed sampled data is carried out quantitative collection, so can be effectively prevented from each frame number of echoes
According to initial data shake occurs.Specifically, in a particular embodiment of the present invention, data acquisition equipment can be in each sampling week
At the preformed rising edge time with road clock, sampled data is acquired in phase.Fig. 7 is to prolong in the embodiment of the present invention
The PRF pulse signal that lags, sequential relationship schematic diagram with road clock and sampled data, as it is shown in fig. 7, data acquisition equipment
Sampled data is acquired by the rising edge time at each sampling period Nei Sui road clock, wherein, in the sampling period
The sampled data collected forms a frame echo data.
The embodiment of the present invention propose collecting method, using postpone after PRF pulse signal the trailing edge moment as
The initial time in sampling period, was acquired preformed sampled data within each sampling period, and unlike existing skill
In art, directly preformed PRF pulse signal is input to data acquisition equipment, no together with channel associate signals and sampled data
PRF pulse signal is postponed, it is clear that compared to the prior art, the collecting method that the embodiment of the present invention proposes, not only
The initial data that can be effectively prevented from each frame clawback data is shaken；And, it is achieved get up simple and convenient, it is simple to general
And, the scope of application is wider.
Fig. 8 is the composition structural representation of data acquisition unit in the embodiment of the present invention, as shown in Figure 8, this harvester
Including:
Delay cell 801, is used for when detecting that there is initial data in the echo data gathered in advance shakes, will in advance
The PRF pulse delay signal predetermined time delay formed, sends an acquisition instructions to collecting unit 802；
Described collecting unit 802, for after receiving described acquisition instructions, with the PRF pulse signal after postponing
Preformed sampled data, as the initial time in sampling period, was adopted within each sampling period by the trailing edge moment
Collection, wherein, the sampled data collected within a sampling period forms a frame echo data.
Further, described collecting unit, specifically within each sampling period preformed with road clock
Described sampled data is acquired by rising edge time.
Further, described delay cell 801 includes:
Receiving subelement 8011, for receiving the adjustment instruction of user's input, wherein, described adjustment in instruction comprises
State predetermined time delay, be sent to described adjustment instruction postpone subelement 8012；
Described delay subelement 8012, for adjusting instruction by described PRF pulse delay signal pre-set delay according to described
Time；Wherein, described predetermined time delay at half with in the clock cycle of road.
Further, described delay subelement 8012, specifically for prolonging of pre-setting according to described adjustment instruction adjustment
Circuit late；Described PRF pulse signal is input in the delay circuit after adjusting；Delay circuit after described adjustment is by described
PRF pulse delay signal predetermined time delay.
Further, described delay circuit includes: sequential time delay circuit, combination logic delay circuit and numerical control signal delay
Device.
In actual applications, described delay cell 801 and collecting unit 802 all can be by the central authorities being positioned at data acquisition equipment
Processor (CPU), microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA) etc. realize.
The embodiment of the present invention propose data acquisition unit, using postpone after PRF pulse signal the trailing edge moment as
The initial time in sampling period, was acquired preformed sampled data within each sampling period, and unlike existing skill
In art, directly preformed PRF pulse signal is input to data acquisition equipment, no together with channel associate signals and sampled data
PRF pulse signal is postponed, it is clear that compared to the prior art, the data acquisition unit that the embodiment of the present invention proposes, not only
The initial data that can be effectively prevented from each frame clawback data is shaken；And, it is achieved get up simple and convenient, it is simple to general
And, the scope of application is wider.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the shape of the embodiment in terms of the present invention can use hardware embodiment, software implementation or combine software and hardware
Formula.And, the present invention can use can be with storage at one or more computers wherein including computer usable program code
The form of the upper computer program implemented of medium (including but not limited to disk memory and optical memory etc.).
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function specified in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function specified in individual square frame or multiple square frame.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.
Claims (10)
1. a collecting method, it is characterised in that described method includes:
When detecting that there is initial data in the echo data gathered in advance shakes, by preformed pulse recurrence frequency
PRF pulse delay signal predetermined time delay；
Using the initial time in trailing edge moment as the sampling period of the PRF pulse signal after delay, within each sampling period
Preformed sampled data is acquired；Wherein, the sampled data collected within a sampling period forms a frame and returns
Wave datum.
Method the most according to claim 1, it is characterised in that described within each sampling period to preformed sampling
Data are acquired including:
At the preformed rising edge time with road clock, described sampled data is acquired within each sampling period.
Method the most according to claim 1, it is characterised in that described by PRF pulse delay signal predetermined time delay bag
Include:
Receiving the adjustment instruction of user's input, described adjustment in instruction includes described predetermined time delay；
Instruction is adjusted by described PRF pulse delay signal predetermined time delay according to described；Wherein, described predetermined time delay exists
Half with in the clock cycle of road.
Method the most according to claim 3, it is characterised in that described PRF pulse is believed by described instruction according to described adjustment
Number postpone predetermined time delay include:
The delay circuit that instruction adjustment pre-sets is adjusted according to described；
Described PRF pulse signal is input in the delay circuit after adjusting；
Delay circuit after described adjustment is by described PRF pulse delay signal predetermined time delay.
Method the most according to claim 4, it is characterised in that described delay circuit includes: sequential time delay circuit, combination are patrolled
Collect delay circuit and numerical control signal delay device.
6. a data acquisition unit, it is characterised in that described device includes:
Delay cell, for when detecting that there is initial data in the echo data gathered in advance shakes, by preformed
PRF pulse delay signal predetermined time delay, sends an acquisition instructions to collecting unit；
Described collecting unit, for after receiving described acquisition instructions, during with the trailing edge of the PRF pulse signal after postponing
Carve the initial time as the sampling period, within each sampling period, preformed sampled data is acquired；Wherein, exist
The sampled data collected in one collection period forms a frame echo data.
Device the most according to claim 6, it is characterised in that described collecting unit, specifically in each sampling period
Described sampled data is acquired by the inherent preformed rising edge time with road clock.
Device the most according to claim 6, it is characterised in that described delay cell includes:
Receive subelement, for receiving the adjustment instruction of user's input, wherein, described adjustment instruction includes described presetting and prolongs
Time late, it is sent to described adjustment instruction postpone subelement；
Described delay subelement, for adjusting instruction by described PRF pulse delay signal predetermined time delay according to described；Its
In, described predetermined time delay at half with in the clock cycle of road.
Device the most according to claim 8, it is characterised in that described delay subelement, specifically for according to described adjustment
Instruction adjusts the delay circuit pre-set；Described PRF pulse signal is input in the delay circuit after adjusting；Described adjustment
After delay circuit by described PRF pulse delay signal predetermined time delay.
Device the most according to claim 9, it is characterised in that described delay circuit includes: sequential time delay circuit, combination
Logical delay circuit and numerical control signal delay device.
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| CN107271890A (en) * | 2017-06-14 | 2017-10-20 | 电子科技大学 | A kind of jittered device of train pulse part trailing edge |
| CN109240981A (en) * | 2018-08-13 | 2019-01-18 | 中国科学院电子学研究所 | Synchronous collection method, equipment and the computer readable storage medium of multi-channel data |
| CN109495090A (en) * | 2018-09-30 | 2019-03-19 | 中国人民解放军海军工程大学 | Digital precise delay match circuit |
| CN109711757A (en) * | 2019-01-24 | 2019-05-03 | 青海大学 | The acquisition method and device of soil moisture data |
| CN112304493A (en) * | 2020-10-29 | 2021-02-02 | 西北工业大学 | CCD camera-based optical pressure-sensitive paint amplitude-frequency characteristic detection method |
| CN114839603A (en) * | 2022-07-05 | 2022-08-02 | 中国科学院空天信息创新研究院 | Method and device for stabilizing transceiving time delay of satellite-borne SAR system and electronic equipment |
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| CN109240981A (en) * | 2018-08-13 | 2019-01-18 | 中国科学院电子学研究所 | Synchronous collection method, equipment and the computer readable storage medium of multi-channel data |
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| CN109711757A (en) * | 2019-01-24 | 2019-05-03 | 青海大学 | The acquisition method and device of soil moisture data |
| CN112304493A (en) * | 2020-10-29 | 2021-02-02 | 西北工业大学 | CCD camera-based optical pressure-sensitive paint amplitude-frequency characteristic detection method |
| CN112304493B (en) * | 2020-10-29 | 2022-04-15 | 西北工业大学 | CCD camera-based optical pressure-sensitive paint amplitude-frequency characteristic detection method |
| CN114839603A (en) * | 2022-07-05 | 2022-08-02 | 中国科学院空天信息创新研究院 | Method and device for stabilizing transceiving time delay of satellite-borne SAR system and electronic equipment |
| CN114839603B (en) * | 2022-07-05 | 2022-09-09 | 中国科学院空天信息创新研究院 | Method and device for stabilizing transceiving time delay of satellite-borne SAR system and electronic equipment |
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