CN111896919A - Echo signal acquisition device - Google Patents
Echo signal acquisition device Download PDFInfo
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- CN111896919A CN111896919A CN202010541481.2A CN202010541481A CN111896919A CN 111896919 A CN111896919 A CN 111896919A CN 202010541481 A CN202010541481 A CN 202010541481A CN 111896919 A CN111896919 A CN 111896919A
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- echo signal
- clock generator
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/35—Details of non-pulse systems
- G01S7/352—Receivers
- G01S7/354—Extracting wanted echo-signals
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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
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention provides an echo signal acquisition device, which comprises a frequency mixer, a filter, a signal acquisition module and a signal sending module, wherein the frequency mixer is electrically connected with the filter; the signal acquisition module comprises a differential amplifier, an A/D converter, a clock generator and an FPGA controller, wherein the differential amplifier is electrically connected with the filter, the differential amplifier is electrically connected with the A/D converter, the A/D converter is electrically connected with the clock generator in a bidirectional mode, and the clock generator is electrically connected with the FPGA controller. According to the invention, the A/D converter and the clock generator are arranged to acquire signals, so that the signal-to-noise ratio of the system is greatly improved, meanwhile, the stability and the anti-frequency aliasing performance of signal acquisition can be improved by the arrangement of the A/D converter and the clock generator, and all information of echo signals can be restored; the complexity of the system is reduced, and the stability and the anti-interference performance of the system are improved.
Description
Technical Field
The invention relates to the field of echo signals, in particular to an echo signal acquisition device.
Background
Echo refers to a signal that arrives at a given point by a path other than the normal path. At this point, the signal is of sufficient size and delay so that it is perceived to be distinct from the signal transmitted by the normal path. The echo is generated because the signal is reflected by the reflector, and the reflector absorbs a part of energy to generate an original signal with attenuation delay, and the original signal is superposed to form the echo.
The prior art has the following defects:
(1) the sampling rate is low, the stability of a sampling system is poor, and meanwhile, the interference is large;
(2) the signal-to-noise ratio is poor; sampling easily causes frequency aliasing, has higher requirements on a filtering transition band of a signal processor, and is not easy to realize;
(3) the problem of contradiction between velocity resolution and spatial resolution is difficult to solve.
Disclosure of Invention
The present invention is directed to an echo signal collecting device to solve the above-mentioned problems.
In order to solve the technical problems, the invention adopts the following technical scheme: echo signal collection system, including mixer and wave filter, wherein mixer and wave filter electric connection, its characterized in that: the device also comprises a signal acquisition module and a signal sending module;
the signal acquisition module comprises a differential amplifier, an A/D converter, a clock generator and an FPGA controller, wherein the differential amplifier is electrically connected with the filter, the differential amplifier is electrically connected with the A/D converter, the A/D converter is electrically connected with the clock generator in a bidirectional mode, and the clock generator is electrically connected with the FPGA controller;
the signal sending module comprises a central processing unit and at least one peripheral drive, the central processing unit is electrically connected with the FPGA controller in a bidirectional mode, and the central processing unit outputs a pseudo-random code sequence and sends the pseudo-random code sequence to the peripheral drive.
Preferably, the working steps of the FPGA controller include fourier transform and spectrum operation, specifically: and carrying out fast Fourier transform on the zero intermediate frequency echo signal, multiplying the zero intermediate frequency echo signal by the frequency spectrum of the transmitting signal, and then carrying out inverse Fourier transform to obtain a frequency modulation signal.
Preferably, the model of the A/D converter is MXT 2162/64.
Preferably, the clock generator is an AD9516-3 clock chip.
Preferably, the model of the FPGA controller is XC7K 325T.
Preferably, the filter is a loop filter.
Compared with the related art, the echo signal acquisition device provided by the invention has the following beneficial effects:
the invention provides an echo signal acquisition device, which is characterized in that an A/D converter and a clock generator are arranged to acquire signals, so that the signal-to-noise ratio of a system is greatly improved, meanwhile, the stability and the anti-frequency aliasing performance of signal acquisition can be improved by the arrangement of the A/D converter and the clock generator, and all information of echo signals can be restored; the system complexity is reduced, the stability and the anti-interference performance of the system are improved, secondly, the zero intermediate frequency echo signal is subjected to fast Fourier transform, then the zero intermediate frequency echo signal is multiplied by the frequency spectrum of a transmitting signal, then inverse Fourier transform is carried out to obtain a frequency modulation signal, and the signal is processed in a frequency domain, so that the defects generated by a method of using an all-pass phase-shifting network, a voltage-controlled oscillator or a dispersion delay line in an early radar are overcome, the speed measuring range, the time resolution and the spatial resolution of the system are improved, the design and manufacturing process level of an FPGA (field programmable gate array) is improved, various radar signal processing algorithms and even the whole radar signal processing system become a development trend of digital signal processing by using the FPGA, and the signal processing is more stable and.
Drawings
FIG. 1 is a block diagram of an echo signal acquisition device according to the present invention;
FIG. 2 is a block diagram of the structure of an information acquisition module according to the present invention;
FIG. 3 is a block flow diagram of the FPGA of the present invention;
fig. 4 is a block diagram of an information sending module according to the present invention.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
Specific embodiments of the present invention are described below with reference to the accompanying drawings.
In the specific implementation process, as shown in fig. 1-2 and fig. 4, the echo signal collecting device includes a mixer and a filter, wherein the mixer is electrically connected to the filter, and the echo signal collecting device is characterized in that: the device also comprises a signal acquisition module and a signal sending module;
the signal acquisition module comprises a differential amplifier, an A/D converter, a clock generator and an FPGA controller, wherein the differential amplifier is electrically connected with the filter, the differential amplifier is electrically connected with the A/D converter, the A/D converter is electrically connected with the clock generator in a bidirectional way, and the clock generator is electrically connected with the FPGA controller;
the signal sending module comprises a central processing unit and at least one peripheral drive, the central processing unit is electrically connected with the FPGA controller in a bidirectional mode, and the central processing unit outputs a pseudo-random code sequence and sends the pseudo-random code sequence to the peripheral drive.
In a specific implementation process, as shown in fig. 2, the working steps of the FPGA controller include fourier transform and spectrum operation, specifically: and carrying out fast Fourier transform on the zero intermediate frequency echo signal, multiplying the zero intermediate frequency echo signal by the frequency spectrum of the transmitting signal, and then carrying out inverse Fourier transform to obtain a frequency modulation signal.
In a specific implementation, as shown in FIG. 2, the A/D converter is model MXT 2162/64.
In a specific implementation, as shown in FIG. 2, the clock generator is an AD9516-3 clock chip.
In the specific implementation, as shown in fig. 2, the model number of the FPGA controller is XC7K 325T.
In a specific implementation, the filter is a loop filter, as shown in fig. 1.
The working principle of the invention is as follows: when the device works, an optical-electrical converter converts an echo signal into an electrical signal and then sends the electrical signal to an A/D converter, a control logic in an FPGA controller realizes the configuration and control of a clock generator to provide a high-frequency sampling clock for the A/D converter, then the Doppler frequency shift analysis based on the data of the A/D converter is completed by the internal logic of the FPGA controller, and then a frequency modulation signal is obtained, finally the frequency modulation signal is analyzed and processed by a central processing unit, and then a pseudo-random code sequence is output and sent to an external drive;
the control logic inside the FPGA controller is as follows: firstly, carrying out fast Fourier transform on a zero intermediate frequency echo signal, then multiplying the changed signal by the frequency spectrum of a transmitting signal, and finally carrying out inverse Fourier transform to obtain a frequency modulation signal.
Compared with the related art, the echo signal acquisition device provided by the invention has the following beneficial effects:
the invention provides an echo signal acquisition device, which comprises the following steps that firstly, an A/D converter and a clock generator are arranged to acquire signals, so that the signal-to-noise ratio of a system is greatly improved, meanwhile, the stability and the anti-frequency aliasing performance of signal acquisition can be improved through the arrangement of the A/D converter and the clock generator, and all information of the echo signals can be restored; the system complexity is reduced, the stability and the anti-interference performance of the system are improved, secondly, the zero intermediate frequency echo signal is subjected to fast Fourier transform, then the zero intermediate frequency echo signal is multiplied by the frequency spectrum of a transmitting signal, then inverse Fourier transform is carried out to obtain a frequency modulation signal, and the signal is processed in a frequency domain, so that the defects generated by a method of using an all-pass phase-shifting network, a voltage-controlled oscillator or a dispersion delay line in an early radar are overcome, the speed measuring range, the time resolution and the spatial resolution of the system are improved, the design and manufacturing process level of an FPGA (field programmable gate array) is improved, various radar signal processing algorithms and even the whole radar signal processing system become a development trend of digital signal processing by using the FPGA, and the signal processing is more stable and.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. Echo signal collection system, including mixer and wave filter, wherein mixer and wave filter electric connection, its characterized in that: the device also comprises a signal acquisition module and a signal sending module;
the signal acquisition module comprises a differential amplifier, an A/D converter, a clock generator and an FPGA controller, wherein the differential amplifier is electrically connected with the filter, the differential amplifier is electrically connected with the A/D converter, the A/D converter is electrically connected with the clock generator in a bidirectional mode, and the clock generator is electrically connected with the FPGA controller;
the signal sending module comprises a central processing unit and at least one peripheral drive, the central processing unit is electrically connected with the FPGA controller in a bidirectional mode, and the central processing unit outputs a pseudo-random code sequence and sends the pseudo-random code sequence to the peripheral drive.
2. An echo signal acquiring apparatus according to claim 1, wherein: the working steps of the FPGA controller comprise Fourier transform and frequency spectrum operation, and specifically comprise: and carrying out fast Fourier transform on the zero intermediate frequency echo signal, multiplying the zero intermediate frequency echo signal by the frequency spectrum of the transmitting signal, and then carrying out inverse Fourier transform to obtain a frequency modulation signal.
3. An echo signal acquiring apparatus according to claim 1, wherein: the model of the A/D converter is MXT 2162/64.
4. An echo signal acquiring apparatus according to claim 1, wherein: the clock generator is an AD9516-3 clock chip.
5. An echo signal acquiring apparatus according to claim 1, wherein: the model of the FPGA controller is XC7K 325T.
6. An echo signal acquiring apparatus according to claim 1, wherein: the filter is a loop filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010541481.2A CN111896919A (en) | 2020-06-15 | 2020-06-15 | Echo signal acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010541481.2A CN111896919A (en) | 2020-06-15 | 2020-06-15 | Echo signal acquisition device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204515123U (en) * | 2015-01-20 | 2015-07-29 | 成都远望科技有限责任公司 | A kind of echo wave signal acquisition device of millimetre-wave radar |
| CN104965197A (en) * | 2015-06-30 | 2015-10-07 | 南京理工大学 | FPGA-based radar echo signal simulator |
| CN205670191U (en) * | 2016-05-25 | 2016-11-02 | 成都远望科技有限责任公司 | A kind of echo wave signal acquisition device of LDV technique |
| CN110109074A (en) * | 2019-04-18 | 2019-08-09 | 西安电子科技大学 | Radar signal preprocess method based on RFSoC chip |
-
2020
- 2020-06-15 CN CN202010541481.2A patent/CN111896919A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204515123U (en) * | 2015-01-20 | 2015-07-29 | 成都远望科技有限责任公司 | A kind of echo wave signal acquisition device of millimetre-wave radar |
| CN104965197A (en) * | 2015-06-30 | 2015-10-07 | 南京理工大学 | FPGA-based radar echo signal simulator |
| CN205670191U (en) * | 2016-05-25 | 2016-11-02 | 成都远望科技有限责任公司 | A kind of echo wave signal acquisition device of LDV technique |
| CN110109074A (en) * | 2019-04-18 | 2019-08-09 | 西安电子科技大学 | Radar signal preprocess method based on RFSoC chip |
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