CN115808679A - Radar high-speed single-target measurement method based on double-sideband LFMCW waveform - Google Patents
Radar high-speed single-target measurement method based on double-sideband LFMCW waveform Download PDFInfo
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- 238000004590 computer program Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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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
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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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- Radar, Positioning & Navigation (AREA)
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- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The application discloses a radar high-speed single-target measuring method based on a double-sideband LFMCW waveform, and relates to the field of radars. The method comprises the steps that in a transmitting period, a baseband LFMCW signal is generated through a DDS, a radio frequency signal is obtained through mixing of a first frequency mixer and a local oscillator, and the radio frequency signal is divided into two paths; the system comprises two paths of power division signals, a first path of radio frequency signal is transmitted to a target and used as a detection signal, and a second path of radio frequency signal is mixed with a target echo signal through a second mixer and then passes through a low-pass filter to obtain a beat frequency signal; and processing the beat frequency signal to obtain target information. This application is through realizing the measurement to target distance and speed in a transmission cycle, and efficient, and the real-time is good, and hardware realizes simply.
Description
Technical Field
The application relates to the field of radars, in particular to a radar high-speed monocular measurement method based on a double-sideband LFMCW waveform.
Background
In the continuous wave system radar, an LFMCW (linear frequency modulated continuous wave) waveform is widely used for measuring a target distance and velocity. However, the existing measurement method cannot complete the measurement of the target speed in one emission period, and has a complex hardware structure and high hardware uncertainty.
Disclosure of Invention
The application aims to provide a radar high-speed target measuring method based on a double-sideband LFMCW waveform.
The application is realized by the following technical scheme:
in a first aspect, the present application provides a method for measuring a radar high-speed single target based on a double-sideband LFMCW waveform, including:
in a transmitting period, generating a baseband LFMCW signal through the DDS, mixing the baseband LFMCW signal with a local oscillator through a first frequency mixer to obtain a radio frequency signal,
dividing the radio frequency signal into two paths;
the system comprises two paths of power division signals, a first path of radio-frequency signal is transmitted to a target and used as a detection signal, and a second path of radio-frequency signal is mixed with a target echo signal through a second mixer and then passes through a low-pass filter to obtain a beat frequency signal;
and processing the beat frequency signal to obtain target information.
Optionally, the baseband LFMCW waveform signal is generated by a direct digital frequency synthesizer (DDS), and the baseband LFMCW waveform signal is a one-way swept baseband LFMCW waveform signal.
Optionally, the dividing the rf signal into two paths includes:
the radio frequency signal is shifted to a desired carrier frequency, and two sidebands of the mixed signal are symmetrical about the desired carrier frequency.
Optionally, the processing the beat signal to obtain target information includes:
analyzing the beat frequency signal to obtain the time delay and Doppler information of the target echo;
the target information comprises a target distance and a target speed, the target distance is obtained through the time delay of a target echo, and the target speed is obtained through Doppler frequency shift.
In a second aspect, the present application provides a radar high-speed single-target measurement apparatus based on a double-sideband LFMCW waveform, including:
the first frequency mixer is used for generating a baseband LFMCW signal through the DDS, obtaining a radio frequency signal by mixing the first frequency mixer and a local oscillator,
the power divider is used for dividing the frequency-mixed signal into two paths, wherein the two paths of power divider are used for dividing the signal into two paths, one path of radio-frequency signal is transmitted to a target and is used as a detection signal, and the other path of radio-frequency signal is mixed with a target echo signal through the second frequency mixer and then passes through a low-pass filter to obtain a beat frequency signal;
the second mixer is used for mixing and mixing the target echo signal and the radio frequency signal and outputting the mixed signal to the low-pass filter;
and the processing module is used for processing the beat frequency signal in a transmission period to obtain target information.
Optionally, the mixer is specifically configured to shift the radio frequency signal to a desired carrier frequency, and two sidebands of the mixed signal are symmetric with respect to the desired carrier frequency.
Optionally, the processing module is specifically configured to analyze the beat signal to obtain a delay and doppler information of a target echo;
the target information comprises a target distance and a target speed, the target distance is obtained through the time delay of a target echo, and the target speed is obtained through Doppler frequency shift.
In a third aspect, an electronic device includes: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any one of the first aspects.
In a fourth aspect, a computer program product comprising a computer program which, when executed by a processor or chip, implements the method according to any of the first aspects.
In a fifth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions for implementing the method of any one of the first aspect when executed by a processor.
The application has the following advantages and beneficial effects:
this application is through realizing the measurement to target distance and speed in an emission cycle, and efficient, and the real-time is good, and the hardware realizes simply.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the disclosure, are incorporated in and constitute a part of this disclosure, and do not constitute a limitation on the embodiments of the disclosure. In the drawings:
fig. 1 is a typical time-frequency diagram of baseband signals in a high-speed single-target measurement method of a radar based on a double-sideband LFMCW waveform according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a radar high-speed single-target measurement device based on a double-sideband LFMCW waveform according to an embodiment of the present application;
fig. 3 is a schematic time-frequency diagram of positive frequency portions of a transmission signal and an echo signal in a radar high-speed monocular measurement method based on a double-sideband LFMCW waveform according to an embodiment of the present application;
fig. 4 is a schematic diagram of a positive frequency partial spectrum obtained after echo mixing and filtering in a radar high-speed monocular measurement method based on a double-sideband LFMCW waveform according to an embodiment of the present disclosure;
fig. 5 is a frequency spectrum diagram of a beat signal in a radar high-speed monocular measurement method based on a double-sideband LFMCW waveform according to an embodiment of the present application;
fig. 6 is a flowchart of a radar high-speed monocular measurement method based on a double-sideband LFMCW waveform according to an embodiment of the present application.
Detailed Description
Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction set forth in the following description or illustrated in the following drawings. The application is capable of other embodiments and of being practiced or of being carried out in various ways. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making inventive improvements, are intended to be within the scope of the present application.
In the continuous wave system radar, an LFMCW (linear frequency modulated continuous wave) waveform is widely used for measuring a target distance and velocity.
However, the existing measurement method cannot complete the measurement of the target speed in one emission period, and has a complex hardware structure and high hardware uncertainty.
Based on this, the embodiment of the application provides a radar high-speed target measurement method based on a double-sideband LFMCW waveform, aims to overcome the defects in the prior art, realizes the measurement of the target distance and speed in one emission period, and has the advantages of high efficiency, good real-time performance and simple hardware implementation.
The embodiment of the application is realized by the following technical scheme, as shown in fig. 6, the method comprises the following steps:
s101, generating a baseband LFMCW signal through a DDS, mixing the baseband LFMCW signal with a local oscillator through a first frequency mixer to obtain a radio frequency signal,
s102, dividing the radio frequency signal into two paths;
the system comprises two paths of power division signals, a first path of radio frequency signal is transmitted to a target and used as a detection signal, and a second path of radio frequency signal is mixed with a target echo signal through a second mixer and then passes through a low-pass filter to obtain a beat frequency signal;
and S103, processing the beat frequency signal to obtain target information.
In one possible implementation, for S101, a baseband LFMCW waveform signal is generated by a direct digital frequency synthesizer (DDS), the waveform having a unidirectional frequency sweep direction, and the frequency sweep starting at frequency f s The bandwidth is B; the baseband signal is used as the input of a first mixer to be mixed with the local oscillator, and is moved to a desired carrier frequency f c To (3). The initial frequencies corresponding to the mixed signals are respectively f 0 +f s And f 0 -f s . The frequency of the mixed signal is related to f in time frequency c Symmetry;
for S102, dividing the mixed signal into two paths by a power divider, where one path is transmitted to a target as a detection signal via a transmitting component, and the other path is used as an input of a second mixer to mix with a target echo signal received by a receiving component;
in a possible implementation manner, for S103, the mixed signal is low-pass filtered to obtain a beat signal, where the beat signal includes the delay and doppler information of the target echo. And finally, the target distance can be estimated according to the time delay extracted from the beat frequency signal, and the target speed can be estimated according to the extracted Doppler frequency shift.
The embodiment of the present application provides a radar high-speed single-target measuring device based on a double-sideband LFMCW waveform, as shown in fig. 2, including:
the first frequency mixer is used for mixing the baseband LFMCW waveform signal with a local oscillator, and the first frequency mixer is a frequency mixer 1 in fig. 2;
the power divider is used for dividing the frequency-mixed signal into two paths, wherein the two paths of power divider are used for dividing the signal into two paths, one path of radio-frequency signal is transmitted to a target and is used as a detection signal, and the other path of radio-frequency signal is mixed with a target echo signal through the second frequency mixer and then passes through a low-pass filter to obtain a beat frequency signal;
a second mixer, configured to mix and mix the target echo signal and the radio frequency signal and output the mixed signal to the low-pass filter, where the second mixer is the mixer 2 in fig. 2;
and the processing module is used for processing the beat frequency signal to obtain target information.
According to the method provided by the embodiment of the application, because the double-sideband signal has the characteristic of sweeping the frequency in positive and negative opposite directions, the echo signal and the transmitting signal are mixed and then generate two different beat frequencies in the same target delay, and the Doppler frequency shift caused by the target speed in each beat frequency is the same. Therefore, the method provided by the embodiment of the application can simultaneously measure the range and the speed of the target in a single transmission period, and has no range-Doppler coupling.
Example 1:
the technical solution of the present application is illustrated by a specific example as follows:
a radar high-speed single-target measurement method based on a double-sideband LFMCW waveform comprises the following steps:
step 1: generation using DDS with start frequency f start A baseband LFMCW signal with a bandwidth of B and a width of T (corresponding to a chirp rate of μ), and a schematic diagram of the baseband signal of one cycle in the time-frequency domain, as shown in fig. 1;
step 2: using the baseband signal generated in step 1 as an input of a first mixer, and the frequency is f c The local oscillation signals are subjected to frequency mixing to obtain radio frequency signals;
and step 3: and (3) dividing the radio-frequency signal subjected to frequency mixing in the step (2) into two paths through a power divider, wherein one path is transmitted to a target as a detection signal through a transmitting component, and the other path is used as one input of a second frequency mixer and is subjected to frequency mixing with an echo signal. The schematic diagram of the transmitted signal and the echo signal in the time-frequency domain is shown in fig. 3;
and 4, step 4: mixing the echo signal with the transmitting signal through a second mixer, and passing the output signal of the second mixer through a low-pass filter to obtain a beat signal, as shown in fig. 4;
and 5: if the distance of the target in step 3 is R and the radial velocity is v, the echo signal delay is
Corresponding beat frequency of f τ = μ τ, doppler shift of
Where c is the speed of light and λ is the signal wavelength. Performing Fast Fourier Transform (FFT) on the beat frequency signal obtained in the step 4 to obtain a frequency spectrum of the beat frequency signal, wherein two peak values exist in a positive half shaft of the frequency spectrum, and frequencies corresponding to the two peak values are f respectively 1 ＝f τ -f d And f 2 ＝f τ +f d 。
And 6: according to the frequencies f corresponding to the two peak values of the beat frequency signal spectrum obtained in the step 5 1 And f 2 Calculating the beat frequency f of the object by the following formula τ And Doppler frequency f d ：
After the beat frequency and the Doppler frequency of the target are obtained, a distance measurement value R 'and a radial velocity measurement value v' of the target are obtained by calculation according to the following formulas:
example 2
A high-speed target to be detected exists in an airspace, the distance of the target is R =3km, and the radial speed is v =300m/s. When the continuous wave system radar is used for measuring the distance and the speed of the target, if the traditional LFMCW waveform is used, the distance and the speed of the target cannot be measured simultaneously in one period, and the hardware structure is complex.
When the double-sideband LFMCW waveform is used, the pulse width T =500 mu s, the bandwidth B =10MHz and the carrier frequency f of the waveform c Frequency modulation slope of =10GHz
The sampling rate fs of the radio frequency signals is =30GHz, and the sampling rate fs of the down-converted signals is =30MHz. The method of the invention is used for measuring a target, generating and transmitting a periodic transmission signal, and the frequency spectrum of the beat signal finally obtained according to the steps of the invention is shown in figure 5. The frequencies corresponding to two peaks in the frequency spectrum are respectively f 1 =0.38M2H and f 2 =0.422MHz, according to f 1 And f 2 The beat frequency is calculated to be
Doppler frequency of
Calculating the target distance of
Radial velocity of
It can be seen that the method of the present invention can simultaneously complete the measurement of the target distance and speed in one period, and the measured distance and speed have small errors.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are described in further detail, it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (7)
1. A radar high-speed monocular measurement method based on a double-sideband LFMCW waveform is characterized by comprising the following steps:
in a transmitting period, generating a baseband LFMCW signal through the DDS, mixing the baseband LFMCW signal with a local oscillator through a first frequency mixer to obtain a radio frequency signal,
dividing the radio frequency signal into two paths;
the system comprises two paths of power division signals, a first path of radio frequency signal is transmitted to a target and used as a detection signal, and a second path of radio frequency signal is mixed with a target echo signal through a second mixer and then passes through a low-pass filter to obtain a beat frequency signal;
and processing the beat frequency signal to obtain target information.
2. The method of claim 1, wherein the baseband LFMCW waveform signal is generated by a DDS, and wherein the baseband LFMCW waveform signal is a one-way swept baseband LFMCW waveform signal.
3. The method of claim 1 or 2, wherein the dividing the rf signal into two paths comprises:
the radio frequency signal is shifted to a desired carrier frequency, and two sidebands of the mixed signal are symmetrical about the desired carrier frequency.
4. The method of any of claims 1-3, wherein processing the beat signal to obtain the target information comprises:
analyzing the beat frequency signal to obtain the time delay and Doppler information of the target echo;
the target information comprises a target distance and a target speed, the target distance is obtained through the time delay of a target echo, and the target speed is obtained through Doppler frequency shift.
5. A radar high-speed single-target measuring device based on a double-sideband LFMCW waveform is characterized by comprising:
the first frequency mixer is used for generating a baseband LFMCW signal through the DDS, obtaining a radio frequency signal by mixing the first frequency mixer and a local oscillator,
the power divider is used for dividing the frequency-mixed signal into two paths, wherein the two paths of power divider are used for dividing the signal into two paths, one path of radio-frequency signal is transmitted to a target and is used as a detection signal, and the other path of radio-frequency signal is mixed with a target echo signal through the second frequency mixer and then passes through a low-pass filter to obtain a beat frequency signal;
the second mixer is used for mixing and mixing the target echo signal and the radio frequency signal and outputting the mixed signal to the low-pass filter;
and the processing module is used for processing the beat frequency signal in a transmission period to obtain target information.
6. The apparatus of claim 5, wherein the mixer is specifically configured to shift the radio frequency signal to a desired carrier frequency, and wherein two sidebands of the mixed signal are symmetric with respect to the desired carrier frequency.
7. The device according to claim 5 or 6, wherein the processing module is specifically configured to analyze the beat signal to obtain the time delay and doppler information of the target echo;
the target information comprises a target distance and a target speed, the target distance is obtained through the time delay of a target echo, and the target speed is obtained through Doppler frequency shift.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211052106.7A CN115808679A (en) | 2022-08-31 | 2022-08-31 | Radar high-speed single-target measurement method based on double-sideband LFMCW waveform |
| PCT/CN2023/127691 WO2024046509A1 (en) | 2022-08-31 | 2023-10-30 | Radar high-speed single-target measurement method based on double-sideband lfmcw waveform |
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| CN202211052106.7A CN115808679A (en) | 2022-08-31 | 2022-08-31 | Radar high-speed single-target measurement method based on double-sideband LFMCW waveform |
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| WO2024046509A1 (en) * | 2022-08-31 | 2024-03-07 | 电子科技大学长三角研究院(衢州) | Radar high-speed single-target measurement method based on double-sideband lfmcw waveform |
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| US4388622A (en) * | 1981-04-15 | 1983-06-14 | The United States Of America As Represented By The Secretary Of The Army | Double sideband linear frequency modulation system for radar applications |
| GB2554947B (en) * | 2016-10-17 | 2018-10-10 | Canon Kk | Velocity and range processing of a received radar signal |
| CN107505626B (en) * | 2017-09-12 | 2019-06-28 | 南京航空航天大学 | Laser measurement method and device based on double sideband modulation |
| CN114035174A (en) * | 2021-12-15 | 2022-02-11 | 浙江科技学院 | Double-channel double-chirp linear frequency modulation continuous wave laser radar method and device |
| CN115808679A (en) * | 2022-08-31 | 2023-03-17 | 电子科技大学长三角研究院(衢州) | Radar high-speed single-target measurement method based on double-sideband LFMCW waveform |
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| WO2024046509A1 (en) * | 2022-08-31 | 2024-03-07 | 电子科技大学长三角研究院(衢州) | Radar high-speed single-target measurement method based on double-sideband lfmcw waveform |
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