CN113219456A - Millimeter wave radar system - Google Patents
Millimeter wave radar system Download PDFInfo
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- CN113219456A CN113219456A CN202110571647.XA CN202110571647A CN113219456A CN 113219456 A CN113219456 A CN 113219456A CN 202110571647 A CN202110571647 A CN 202110571647A CN 113219456 A CN113219456 A CN 113219456A
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
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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
- G01S7/417—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 involving the use of neural networks
Abstract
The utility model provides a millimeter wave radar system belongs to radar imaging technology field, and it can solve the relatively poor problem of current millimeter wave radar system detection precision. The disclosed millimeter wave radar system includes: an antenna array divided into a plurality of groups of antenna units; each group of the multiple groups of antenna units is configured to send a radio-frequency signal and receive an echo signal, wherein the echo signal is a signal returned after the radio-frequency signal touches an object; a plurality of radio frequency front ends, the plurality of radio frequency front ends being cascaded; one of the radio frequency front ends is connected with one of the antenna units, and is configured to generate a radio frequency signal, process a received echo signal to obtain echo information, and store the echo information; the data acquisition unit is connected with the radio frequency front ends and is configured to acquire echo information stored by the radio frequency front ends so that the data processing unit processes the echo information.
Description
Technical Field
The disclosure belongs to the technical field of radar imaging, and particularly relates to a millimeter wave radar system.
Background
The millimeter wave radar is a radar which works in a millimeter wave band for detection. Compared with optical probes such as infrared, laser and television, the millimeter wave probe has strong capability of penetrating fog, smoke and dust and has the characteristics of all weather (except heavy rainy days) all day long. In addition, the anti-interference and anti-stealth capabilities of the millimeter wave seeker are superior to those of other microwave seeker, the millimeter wave radar can distinguish and identify very small targets and can identify a plurality of targets simultaneously, and the millimeter wave seeker has the advantages of being strong in imaging capability, small in size, good in maneuverability and concealment and the like.
However, the existing millimeter wave radar has poor detection accuracy and high cost, so a scheme is needed to be provided so as to reduce the cost of the millimeter wave radar while improving the detection accuracy of the millimeter wave radar.
Disclosure of Invention
The present disclosure is directed to at least one of the technical problems of the prior art, and provides a millimeter wave radar system.
In a first aspect, an embodiment of the present disclosure provides a millimeter wave radar system, including:
an antenna array divided into a plurality of groups of antenna units; each group of the multiple groups of antenna units is configured to send a radio frequency signal and receive an echo signal, wherein the echo signal is a signal returned after the radio frequency signal collides with an object;
a plurality of radio frequency front ends, the plurality of radio frequency front ends being cascaded; one of the radio frequency front ends is connected with one of the antenna units, and is configured to generate a radio frequency signal, process the received echo signal to obtain echo information, and store the echo information;
the data acquisition unit is connected with the radio frequency front ends and is configured to acquire echo information stored by the radio frequency front ends so that the data processing unit can process the echo information.
Optionally, the millimeter wave radar system further includes a data processing unit, an input end of the data processing unit is connected to the data acquisition unit, and the data processing unit is configured to read echo information acquired by the data acquisition unit, and analyze and process the echo information to obtain processed echo information.
Optionally, the processed echo information includes at least one of echo distance information, echo speed information, and echo angle of arrival information.
Optionally, the millimeter wave radar system further includes a display unit, an output end of the data processing unit is connected to the display unit, and the display unit is configured to perform imaging display according to the processed echo information.
Optionally, the millimeter wave radar system further includes a fall detection unit, an output end of the data processing unit is connected to the fall detection unit, and the fall detection unit is configured to perform fall detection according to the processed echo information.
Optionally, the data processing unit comprises a system on chip SOC based on an extensible processing platform.
Optionally, the data processing unit includes a programmable logic array and a DSP processor, an output end of the programmable logic array is connected to an input end of the DSP processor, and an input end of the programmable logic array is connected to the data acquisition unit.
Optionally, each of the plurality of groups of antenna units includes a plurality of transmitting antennas and a plurality of receiving antennas; and the plurality of transmitting antennas and the plurality of receiving antennas are connected with the radio frequency front end.
Optionally, the radio frequency front end has a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other, the transmitting antenna is located at the first side of the radio frequency front end, and the receiving antenna is located at the third side of the radio frequency front end. Optionally, each of the transmitting antennas is arranged in a plurality of rows and columns; the receiving antennas are arranged in a plurality of rows and columns.
Optionally, a distance between the receiving antennas in any two rows is λ, and a distance between the transmitting antennas in any two columns is λ, where λ is an operating wavelength.
Optionally, in the same row, the distance between any two adjacent receiving antennas is λ/2, and in the same column, the distance between any two adjacent transmitting antennas is λ/2, where λ is an operating wavelength.
Optionally, the wiring distances from each of the transmitting antennas to the rf front end are all equal, and the wiring distances from each of the receiving antennas to the rf front end are all equal.
Optionally, the radio frequency front end includes a low noise amplifier, a mixer, a filter, an intermediate frequency amplifier, an analog-to-digital converter, a buffer, and a waveform generator, wherein the low noise amplifier, the mixer, the filter, the intermediate frequency amplifier, the analog-to-digital converter, and the buffer are connected in sequence, an input end of the mixer is connected to the waveform generator and the antenna unit, an input end of the low noise amplifier is connected to the antenna unit, and an output end of the buffer is connected to the data acquisition unit.
Optionally, the radio frequency front end includes a radio frequency chip AWR 2243.
Drawings
Fig. 1 is a schematic structural diagram of a millimeter wave radar system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another millimeter wave radar system provided in the embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another millimeter wave radar system provided in the embodiment of the present disclosure;
fig. 4 is a schematic layout diagram of an antenna unit according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of another layout of an antenna unit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a radio frequency front end in a millimeter wave radar system according to an embodiment of the present disclosure.
Detailed Description
For a better understanding of the technical aspects of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1 is a schematic structural diagram of a millimeter wave radar system, and as shown in fig. 1, the millimeter wave radar system includes an antenna array 10, a plurality of cascaded radio frequency front ends 20, and a data acquisition unit 30. The antenna array 10 includes a plurality of antenna units 101, wherein one antenna unit 101 of the plurality of antenna units is connected to one radio frequency front end 20 of the plurality of radio frequency front ends, and the plurality of radio frequency front ends 20 are connected to the data acquisition unit 30. In the working process of the radar system, each group 101 in the multiple groups of antenna units is configured to send a radio frequency signal and receive an echo signal, wherein the echo signal is a signal returned after the radio frequency signal touches an object; each rf front end 20 is configured to generate a radio frequency signal, process an echo signal received by the antenna unit 101 to obtain echo information, and store the echo information; the data acquisition unit 30 is configured to acquire echo information stored by the plurality of radio frequency front ends 20, so that the data processing unit performs analysis processing on the echo information.
The antenna array 10 is a radiation system formed by arranging a plurality of groups of antenna elements 101 in a certain direction. The antenna units 101 may be the same antenna unit or different antenna units, and this embodiment is described by taking the example that each of the multiple groups of antenna units is the same antenna unit. The same antenna element means that the antenna elements in the multiple groups have the same structural shape, the same size, and the same arrangement direction, that is, the same directional pattern factor. Of course, the antenna unit 101 may be a different antenna unit, and is not limited in particular. The number of the antenna units 101 may be set by a user as needed, and is not particularly limited herein.
The data acquisition unit 30 may adopt a system on chip SOC or a programmable logic array FPGA + DSP processor architecture based on an extensible processing platform, or the like. When the data acquisition unit 30 employs a programmable logic array FPGA and a DSP processor, the output end of the programmable logic array is connected to the input end of the DSP processor, and the input end of the programmable logic array is connected to the data acquisition unit. The data processing unit may be disposed inside the millimeter wave radar, or may be separately disposed outside the millimeter wave radar system and connected to the millimeter wave radar system, which is not specifically limited herein. The present embodiment is described by taking an example of a manner in which the data processing unit is separately provided outside the millimeter wave radar system and connected to the millimeter wave radar system.
In this embodiment, since a plurality of rf front ends 20 are adopted to cascade, and a plurality of rf front ends 20 are connected to a plurality of groups of antenna units 101, compared with the prior art, the number of antenna units 101 in the radar system is greatly increased, so that the angular resolution of the radar is improved, and the detection accuracy of the radar is further improved.
In some embodiments, fig. 2 is a schematic structural diagram of another millimeter wave radar system provided in the present disclosure, and as shown in fig. 2, the millimeter wave radar system includes an antenna array 10, a plurality of cascaded radio frequency front ends 20, a data acquisition unit 30, a data processing unit 40, and a display unit 50. The antenna array 10 includes a plurality of antenna units 101, wherein one antenna unit 101 of the plurality of antenna units is connected to one radio frequency front end 20 of the plurality of radio frequency front ends, and the plurality of radio frequency front ends 20 are connected to the data acquisition unit 30. The input end of the data processing unit 40 is connected with the data acquisition unit 30, and the output end of the data processing unit 40 is connected with the display unit 50. The data processing unit 40 is configured to read the echo information collected by the data collecting unit 30, and analyze and process the echo information to obtain processed echo information. For example: the processed echo information may include echo distance information, echo speed information, echo angle of arrival information, and the like. In this embodiment, the echo information after processing includes echo distance information, echo speed information, and echo angle-of-arrival information. The display unit 50 is configured to perform imaging display based on the echo distance information, the echo speed information, and the echo angle of arrival information transmitted from the data processing unit 40.
Specifically, the data processing unit 40 reads the echo information acquired by the data acquisition unit 30, obtains echo distance information by performing Fast Fourier Transform (FFT), obtains echo velocity information by performing range doppler, obtains echo angle information by performing AOA (angle of arrival positioning and tracking), and transmits the echo distance information, the echo velocity information, and the echo angle information as meta information to the display unit 50 for display.
It should be noted that the data processing unit 40 may be, but is not limited to, a programmable logic array FPGA, a single chip microcomputer, etc. The display unit 50 may be selected from, but not limited to, a computer screen or a mobile phone screen.
How the millimeter wave radar system performs imaging display is described in detail below with reference to fig. 2:
first, the radio frequency front end 20 transmits a radio frequency signal through the antenna unit 101, receives an echo signal returned after the radio frequency signal hits an object, processes the received echo signal through the radio frequency front end 20 to obtain echo information, and stores the echo information.
Then, the data acquisition unit 30 acquires echo information stored in the radio frequency front end 20 and sends the echo information to the data processing unit 40.
Finally, the data processing unit 40 performs range FFT on the echo information to obtain echo distance information, performs range doppler to obtain echo velocity information, performs AOA detection to obtain echo arrival angle information, and transmits the echo distance information, echo velocity information, and echo arrival angle information as meta information to the display unit 50 for imaging display. The display unit 50 may display two-dimensional or three-dimensional images according to the user's needs.
In this embodiment, through set up data processing unit and display element in millimeter wave radar system, realized millimeter wave radar's formation of image demonstration, simultaneously, owing to adopt a plurality of radio frequency front ends 20 to cascade, and a plurality of antenna element are connected to a plurality of radio frequency front ends, consequently increased antenna element 101's among the radar system quantity to the angular resolution of radar has been improved, and then the precision of radar formation of image demonstration has been improved.
In some embodiments, fig. 3 is a schematic structural diagram of another millimeter wave radar system provided in the embodiments of the present disclosure, and as shown in fig. 3, the millimeter wave radar system includes an antenna array 10, a plurality of cascaded radio frequency front ends 20, a data acquisition unit 30, a data processing unit 40, and a fall detection unit 60. The antenna array 10 includes a plurality of antenna units 101, wherein one antenna unit 101 of the plurality of antenna units is connected to one radio frequency front end 20 of the plurality of radio frequency front ends, and the plurality of radio frequency front ends 20 are connected to the data acquisition unit 30. The input end of the data processing unit 40 is connected with the data acquisition unit 30, and the output end of the data processing unit 40 is connected with the fall detection unit 60. The data processing unit 40 is configured to read the echo information collected by the data collecting unit 30, and analyze and process the echo information to obtain processed echo information, where the processed echo information may include echo distance information, echo speed information, echo angle of arrival information, and the like. In this embodiment, the echo information after processing includes echo distance information, echo speed information, and echo angle-of-arrival information. The fall detection unit 60 is configured to perform fall detection based on the echo distance information, the echo speed information, and the echo arrival angle information transmitted by the data processing unit 40.
How the millimeter wave radar system performs fall detection is described in detail below with reference to fig. 3.
Firstly, the fall detection unit 60 generates a first image according to the echo distance information, the echo speed information and the echo reaching angle information sent by the data processing unit 40, wherein the first image is a multi-frame continuous image corresponding to a plurality of frames of continuous echo signals;
then, determining the posture of the target object according to the recognition result of the neural network model on the first image; and under the condition that the target object is determined to be in the falling posture, generating a buzzing warning signal, sending the buzzing warning signal to a buzzing device to control the buzzing device to sound, or generating a falling help-seeking signal, and sending the falling help-seeking signal to a target rescuer to prompt the target rescuer to rescue the target object.
It should be noted that the neural network model may be a convolutional neural network model, and the convolutional neural network model has few parameters, a fast determination speed, and a high determination accuracy, and is particularly suitable for identifying images. Other neural network models may also be employed and are not described in detail herein.
In this embodiment, through set up data processing unit 40 and fall detecting element 60 in millimeter wave radar system, realized millimeter wave radar's fall detection function, simultaneously, owing to adopt a plurality of radio frequency front ends 20 to cascade, and a plurality of radio frequency front ends connect multiunit antenna element, consequently the quantity of antenna element 101 among the multiplicable radar system to the angular resolution of radar has been improved, and then the precision of radar formation of image demonstration has been improved.
In some embodiments, the antenna unit includes a plurality of transmitting antennas and a plurality of receiving antennas, and the plurality of transmitting antennas and the plurality of receiving antennas are connected to the rf front end. The multiple transmitting antennas are used for transmitting radio-frequency signals generated by the radio-frequency front end, and the multiple receiving antennas are used for receiving echo signals returned after the radio-frequency signals collide with an object. The number of the transmitting antennas and the number of the receiving antennas in the antenna unit can be selected according to the type of the radio frequency front end.
The cascade relation of the N radio frequency front ends AWR2243 is shown in fig. 3, the N radio frequency front ends AWR2243 are sequentially connected in series, that is, the input end of the nth radio frequency front end AWR2243 is connected to the output end of the (N-1) th radio frequency front end AWR2243, the output end of the nth radio frequency front end AWR2243 is connected to the input end of the (N + 1) th radio frequency front end AWR2243, where N is a positive integer.
For example, when N is 4, fig. 4 is a schematic layout diagram of an antenna unit provided in the present embodiment of the disclosure, and as shown in fig. 4, in the present embodiment, a millimeter wave radar system includes 4 radio frequency front ends 20, and a model of each radio frequency front end is AWR 2243. Since the radio frequency front end AWR2243 has 3 transmitting antenna interfaces and 4 receiving antenna interfaces, as shown in fig. 4, the millimeter wave radar system includes a plurality of sets of antenna units and four radio frequency front ends 20, each set 101 of the plurality of sets of antenna units includes 3 transmitting antennas and 4 receiving antennas (for example, the first set includes a first transmitting antenna T1, a second transmitting antenna T2, a third transmitting antenna T3, a first receiving antenna R1, a second receiving antenna R2, a third receiving antenna R3 and a third receiving antenna R4; the second set includes a first transmitting antenna T4, a second transmitting antenna T5, a third transmitting antenna T6, a first receiving antenna R5, a second receiving antenna R6, a third receiving antenna R7 and a third receiving antenna R8; the third set includes a first transmitting antenna T7, a second transmitting antenna T8, a third transmitting antenna T9, a third receiving antenna T9, A first receiving antenna R9, a second receiving antenna R10, a third receiving antenna R11 and a third receiving antenna R12 …), and each of the transmitting antenna and the receiving antenna is connected to an rf front end AWR2243 (not shown in the figure). The transmitting antenna (T1-T12) is used for transmitting radio frequency signals generated by the radio frequency front end AWR2243, and the receiving antenna (R1-R16) is used for receiving echo signals returned after the radio frequency signals hit an object and transmitting the echo signals back to the radio frequency front end 20. With continued reference to fig. 4, the distance between any two adjacent receive antennas is λ/2 and the distance between any two adjacent transmit antennas is λ/2, where λ is the operating wavelength.
In this embodiment, since 4 cascaded radio frequency front ends AWR2243 are adopted, and any one of the cascaded radio frequency front ends AWR2243 is connected to 3 transmitting antennas and 4 receiving antennas, that is, all the cascaded radio frequency front ends AWR2243 are connected to 12 transmitting antennas and 16 receiving antennas, compared with the prior art, the number of antennas in the radar system is greatly increased, so that the angular resolution of the radar is improved, and the accuracy of radar imaging display is improved. Meanwhile, compared with a millimeter wave radar system adopting a high-cost multi-channel single radio frequency front-end chip in the prior art, the millimeter wave radar system can reduce the cost of the millimeter wave radar system by adopting the low-cost radio frequency front-end AWR2243 for cascade connection.
It should be noted that, this embodiment is described by taking an antenna array including 12 transmitting antennas and 16 receiving antennas as an example, and does not constitute a limitation to this application, and a person skilled in the art may select the number of the transmitting antennas and the receiving antennas according to circumstances, and the description is not repeated here.
In some embodiments, the rf front end has a first side and a second side disposed opposite to each other, and a third side and a fourth side disposed opposite to each other, the transmit antenna is located on the first side of the rf front end, and the receive antenna is located on the third side of the rf front end.
Specifically, as shown in fig. 4, the rf front end has four sides, i.e., a first side P1 and a second side P2 disposed oppositely, and a third side P3 and a fourth side P4 disposed oppositely, as shown in fig. 4, the transmitting antenna T is located on the first side P1 of the rf front end, and the receiving antenna R is located on the third side P3 of the rf front end. By arranging the transmit antenna T and the receive antenna R on different sides of the rf front end, respectively, interference between the transmit signal and the receive signal may be reduced. Correspondingly, the transmitting antenna T may also be located at the second side P2 of the rf front end, and the receiving antenna R may also be located at the fourth side P4 of the rf front end; or the transmitting antenna T can also be positioned at the first side P1 of the radio frequency front end, and the receiving antenna R can also be positioned at the second side P2 of the radio frequency front end; or the transmitting antenna T may be located on the third side P3 of the rf front end, and the receiving antenna R may be located on the fourth side P4 of the rf front end, and the principles of the above various arrangement manners are the same as those of the transmitting antenna T located on the first side P1 of the rf front end and the receiving antenna R located on the third side P3 of the rf front end, and are not described herein again.
In some embodiments, the transmit antennas are arranged in a plurality of rows and columns and the receive antennas are arranged in a plurality of rows and columns. For example, fig. 5 is another layout schematic diagram of the antenna unit provided in the embodiment of the present disclosure, as shown in fig. 5, in the millimeter wave radar system, 12 transmitting antennas are arranged in 2 rows and 2 columns, and 16 receiving antennas are arranged in 2 rows and 2 columns, where each 3 transmitting antennas and each 4 receiving antennas constitute one antenna unit 101. The distance between the receiving antennas in any two rows is lambda, and the distance between the transmitting antennas in any two columns is lambda; in the same row, the distance between any two adjacent receiving antennas is lambda/2, in the same column, the distance between any two adjacent transmitting antennas is lambda/2, wherein lambda is the working wavelength. It should be noted that, in the present embodiment, only the transmitting antennas are arranged in 2 rows and 2 columns, and the receiving antennas are arranged in 2 rows and 2 columns, but the transmitting antennas and the receiving antennas may also be arranged in other forms, which is not illustrated here.
In this embodiment, the transmitting antennas are arranged in a plurality of rows and a plurality of columns, and the receiving antennas are arranged in a plurality of rows and a plurality of columns, so that the area occupied by the antenna units can be reduced, and the volume of the millimeter wave radar system can be further reduced.
In some embodiments, each transmit antenna is routed an equal distance from the rf front end, and each receive antenna is routed an equal distance from the rf front end. The wiring distance is the distance from the antenna to the wiring of the radio frequency front end. In order to ensure that the distances between the antennas and the radio frequency front end are equal, for example, the antenna closer to the radio frequency front end can be wired in a bent curve manner, and the antenna farther from the radio frequency front end can be wired in a straight line manner, so that the distances between the antennas and the radio frequency front end are consistent. Therefore, the time of the radio-frequency signal from the transmitting antenna to the radio-frequency front end is ensured to be the same, the time of the echo signal from the receiving antenna to the radio-frequency front end is ensured to be the same, and the echo signal processing is simpler.
In some embodiments, fig. 6 is a schematic structural diagram of a radio frequency front end in a millimeter wave radar system according to an embodiment of the present disclosure, as shown in fig. 6, the radio frequency front end 20 includes a low noise amplifier 201, a mixer 202, a filter 203, an intermediate frequency amplifier 204, an analog-to-digital converter 205, a buffer 206, and a waveform generator 207, where the low noise amplifier 201, the mixer 202, the filter 203, the intermediate frequency amplifier 204, the analog-to-digital converter 205, and the buffer 206 are sequentially connected, an input end of the mixer 202 is connected to the waveform generator 207 and the antenna unit 101, an input end of the low noise amplifier 201 is connected to the antenna unit 101, and an output end of the buffer 206 is connected to the data acquisition unit 30.
As shown in fig. 6, the waveform generator 207 generates a radio frequency signal and transmits the radio frequency signal to the outside through a transmission antenna in the antenna unit 101. Returning an echo signal after the transmitted radio frequency signal meets an object; receiving echo signals by a receiving antenna in the antenna unit 101, converting the received echo signals into echo information through a low noise amplifier 201, a mixer 202, a filter 203, an intermediate frequency amplifier 204 and an analog-to-digital converter 205 of the radio frequency front end 20, and finally storing the echo information in a buffer 206 of the radio frequency front end 20; the data acquisition unit 30 acquires echo information stored in the radio frequency front end 20, so that the data processing unit processes the echo information.
In the present embodiment, since the rf front end 20 includes the low noise amplifier 201, the mixer 202, the filter 203, the intermediate frequency amplifier 204, the analog-to-digital converter 205, the buffer 206 and the waveform generator 207, compared with the existing rf front end, the rf front end has the advantages of simple structure and low cost.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (15)
1. A millimeter-wave radar system, comprising:
an antenna array divided into a plurality of groups of antenna units; each group of the multiple groups of antenna units is configured to send a radio frequency signal and receive an echo signal, wherein the echo signal is a signal returned after the radio frequency signal collides with an object;
a plurality of radio frequency front ends, the plurality of radio frequency front ends being cascaded; one of the radio frequency front ends is connected with one of the antenna units, and is configured to generate the radio frequency signal, process the received echo signal to obtain echo information, and store the echo information;
the data acquisition unit is connected with the radio frequency front ends and is configured to acquire echo information stored by the radio frequency front ends so that the data processing unit can process the echo information.
2. The millimeter wave radar system according to claim 1, further comprising a data processing unit, wherein an input end of the data processing unit is connected to the data acquisition unit, and the data processing unit is configured to read the echo information acquired by the data acquisition unit, and analyze and process the echo information to obtain processed echo information.
3. The millimeter wave radar system according to claim 2, wherein the processed echo information includes at least one of echo distance information, echo speed information, and echo angle of arrival information.
4. The millimeter wave radar system according to claim 2, further comprising a display unit, wherein an output of the data processing unit is connected to the display unit, and the display unit is configured to perform imaging display according to the processed echo information.
5. The millimeter wave radar system according to claim 2, further comprising a fall detection unit, wherein an output of the data processing unit is connected to the fall detection unit, and the fall detection unit is configured to perform fall detection according to the processed echo information.
6. The millimeter-wave radar system of claim 2, wherein the data processing unit comprises a system-on-chip (SOC) based scalable processing platform.
7. The millimeter wave radar system according to claim 2, wherein the data processing unit comprises a programmable logic array and a DSP processor, an output terminal of the programmable logic array is connected with an input terminal of the DSP processor, and an input terminal of the programmable logic array is connected with the data acquisition unit.
8. The millimeter-wave radar system of claim 1, wherein each of the plurality of sets of antenna elements includes a plurality of transmit antennas and a plurality of receive antennas; and the plurality of transmitting antennas and the plurality of receiving antennas are connected with the radio frequency front end.
9. The millimeter wave radar system of claim 8, wherein the radio frequency front end has a first side and a second side disposed opposite to each other and a third side and a fourth side disposed opposite to each other, the transmit antenna being located on the first side of the radio frequency front end, and the receive antenna being located on the third side of the radio frequency front end.
10. The millimeter-wave radar system according to claim 8, wherein the transmission antennas are arranged in a plurality of rows and columns; the receiving antennas are arranged in a plurality of rows and columns.
11. The millimeter wave radar system of claim 10, wherein the distance between the receiving antennas in any two rows is λ and the distance between the transmitting antennas in any two columns is λ, where λ is the operating wavelength.
12. The millimeter wave radar system according to claim 10 or 11, wherein a distance between any two adjacent receiving antennas in the same row is λ/2, and a distance between any two adjacent transmitting antennas in the same column is λ/2, where λ is an operating wavelength.
13. The millimeter-wave radar system of claim 8, wherein each of the transmit antennas is wired equidistant from the radio-frequency front end, and wherein each of the receive antennas is wired equidistant from the radio-frequency front end.
14. The millimeter wave radar system according to claim 1, wherein the radio frequency front end comprises a low noise amplifier, a mixer, a filter, an intermediate frequency amplifier, an analog-to-digital converter, a buffer and a waveform generator, wherein the low noise amplifier, the mixer, the filter, the intermediate frequency amplifier, the analog-to-digital converter and the buffer are connected in sequence, an input end of the mixer is connected with the waveform generator and the antenna unit, an input end of the low noise amplifier is connected with the antenna unit, and an output end of the buffer is connected with the data acquisition unit.
15. The millimeter wave radar system of claim 1, wherein the radio frequency front end comprises a radio frequency chip AWR 2243.
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| CN202110571647.XA CN113219456A (en) | 2021-05-25 | 2021-05-25 | Millimeter wave radar system |
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| CN202110571647.XA CN113219456A (en) | 2021-05-25 | 2021-05-25 | Millimeter wave radar system |
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