CN112305515A - Signal processing method, signal processing system and millimeter wave sensor chip - Google Patents
Signal processing method, signal processing system and millimeter wave sensor chip Download PDFInfo
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- CN112305515A CN112305515A CN202011141820.4A CN202011141820A CN112305515A CN 112305515 A CN112305515 A CN 112305515A CN 202011141820 A CN202011141820 A CN 202011141820A CN 112305515 A CN112305515 A CN 112305515A
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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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- 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
Abstract
The invention discloses a signal processing method, a signal processing system and a millimeter wave sensor chip, wherein the signal processing system comprises a local oscillator signal generating unit and a radio frequency transceiver, the radio frequency transceiver comprises a local oscillator network input module, a TX access and an RX access, wherein: the local oscillation signal generating unit comprises a frequency synthesizer and a first amplifier; the TX path includes a power amplifier and a transmit antenna; the RX path includes a quadrature generator and a quadrature downconverter. The invention can support multi-transmitting multi-receiving and multi-chip cascade, and can be widely applied to sensors in the fields of Internet of things and artificial intelligence; the invention has the characteristics of complete functions, flexible use and expandability, can completely separate signal generation and signal receiving and transmitting, can also be organically fused in the same chip, has flexible expansibility on local oscillator channels, and can realize large-scale array.
Description
Technical Field
The invention belongs to the technical field of millimeter wave radar chips, and particularly relates to a signal processing method, a signal processing system and a millimeter wave sensor chip.
Background
With the popularization and expansion of artificial intelligence and internet of things application, the application requirements of the multidimensional sensing technology are gradually growing, wherein the millimeter wave sensor is an important component of the technology.
The millimeter wave radar works in a millimeter wave band, namely a 30-300 GHz band (the wavelength is 1-10 mm). The millimeter wave seeker has the advantages of small size, light weight, high spatial resolution, interference resistance and the like, and has great significance in the aspects of communication, radar, guidance, remote sensing technology, radio astronomy and wave spectroscopy.
The traditional millimeter wave radar is generally provided with a TR component, a local oscillator signal generation mode comprises frequency modulation mode generation and the like, an intermediate frequency analog signal processing mode comprises filtering and analog-to-digital conversion, a baseband digital signal processing mode and a microprocessor are used for control and judgment in practical application. Generally, the system has the defects of complexity, high cost, large power consumption and the like, and is not suitable for the requirements of low cost, small size and low power consumption in artificial intelligence and millimeter wave application.
In the prior art, the sensor chip of K/Ka band (20-26.5 GHz/33.4-36 GHz) is usually a simple TR component or a simple Voltage Controlled Oscillator (VCO) for generating RF signals, such as BGT24 series chip of England flying. Other prior arts such as chinese patent publication No. CN110927675A are all based on modes of externally connecting voltage-controlled oscillator control signals and outputting intermediate frequency signals, and the single function requires a large number of peripheral chips to support, which increases the system cost sharply, and simultaneously, externally connecting and outputting analog signals also puts higher requirements on the whole system design.
Therefore, in view of the above technical problems, it is necessary to provide a signal processing method, a signal processing system and a millimeter wave sensor chip.
Disclosure of Invention
The invention aims to provide a signal processing method, a signal processing system and a millimeter wave sensor chip.
In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:
a signal processing method, the signal processing method comprising:
the frequency synthesizer generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module divides the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the first local oscillation signal transmits a radio frequency signal with a modulation signal after passing through a power amplifier and a transmitting antenna on a TX path;
and the second local oscillator signal enters the orthogonal down converter after passing through the orthogonal generator on an RX path, is multiplied by a reflected signal received by the receiving antenna in the orthogonal down converter to realize down conversion, and outputs an intermediate frequency signal.
In one embodiment, the signal processing method further includes:
the first local oscillator signal is subjected to frequency multiplication or frequency division through a first frequency multiplier or a first frequency divider;
and/or the second local oscillator signal is subjected to frequency multiplication or frequency division through a second frequency multiplier or a second frequency divider.
In one embodiment, the signal processing method further includes:
and amplifying the reflected signal received by the receiving antenna by a low noise amplifier and/or a second amplifier.
The technical scheme provided by another embodiment of the invention is as follows:
a signal processing system, the signal processing system comprising a local oscillator signal generating unit and a radio frequency transceiver, the radio frequency transceiver comprising a local oscillator network input module, a TX path and an RX path, wherein:
the local oscillation signal generating unit comprises a frequency synthesizer and a first amplifier, wherein the frequency synthesizer generates a modulation signal and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module is used for dividing the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the TX path comprises a power amplifier and a transmitting antenna, and a first local oscillator signal transmits a radio frequency signal with a modulated signal after passing through the power amplifier and the transmitting antenna;
and the RX path comprises an orthogonal generator and an orthogonal down converter, the second local oscillator signal enters the orthogonal down converter after passing through the orthogonal generator, and is multiplied by a reflected signal received by the receiving antenna in the orthogonal down converter to realize down conversion, and an intermediate frequency signal is output.
In an embodiment, the TX path further includes a first frequency multiplier or a first frequency divider, configured to multiply or divide a frequency of the first local oscillator signal; and/or, the RX path further includes a second frequency multiplier or a second frequency divider for multiplying or dividing the frequency of the second local oscillator signal.
In one embodiment, the signal processing system further comprises:
and the noise amplifier and/or the second amplifier are/is used for amplifying the reflected signal received by the receiving antenna.
In an embodiment, the local oscillator signal generating unit and the radio frequency transceiver are integrated on a same chip.
In an embodiment, the local oscillator signal generating unit and the radio frequency transceiver are respectively integrated on different chips.
The technical scheme provided by the further embodiment of the invention is as follows:
a millimeter wave sensor chip comprises the signal processing system.
In one embodiment, the working frequency band of the millimeter wave sensor chip is a K/Ka frequency band.
Compared with the prior art, the invention has the following advantages:
the invention can support multi-transmitting multi-receiving and multi-chip cascade, and can be widely applied to sensors in the fields of Internet of things and artificial intelligence;
the invention has the characteristics of complete functions, flexible use and expandability, can completely separate signal generation and signal receiving and transmitting, can also be organically fused in the same chip, has flexible expansibility on local oscillator channels, and can realize large-scale array.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a signal processing system according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating a signal processing method according to a first embodiment of the present invention;
FIG. 3 is a block diagram of a signal processing system according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a signal processing method according to a second embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. The embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the embodiments are included in the scope of the present invention.
Referring to fig. 1, a signal processing system in a first embodiment of the present invention includes a local oscillator signal generating unit 10 and a radio frequency transceiver 20, where the radio frequency transceiver 20 includes a local oscillator network input module 21, a TX path and an RX path, where:
the local oscillation signal generating unit 10 comprises a frequency synthesizer 11 and a first amplifier 12, wherein the frequency synthesizer 11 generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier 12;
the local oscillator network input module 21 is configured to divide the local oscillator signal into a plurality of first local oscillator signals and a plurality of second local oscillator signals;
the TX path (signal transmission path) includes a power amplifier and a transmitting antenna 22, and the first local oscillator signal transmits a radio frequency signal with a modulated signal after passing through the power amplifier and the transmitting antenna 22;
the RX path (signal receiving path) includes an orthogonal generator 23 and an orthogonal down converter 24, and the second local oscillator signal passes through the orthogonal generator 23 and then enters the orthogonal down converter 24, and is multiplied by the reflected signal received by the receiving antenna in the orthogonal down converter to realize down conversion, and output an intermediate frequency signal.
Preferably, the present embodiment further includes a noise amplifier and/or a second amplifier 25, which is used for amplifying the reflected signal received by the receiving antenna.
Accordingly, referring to fig. 2, the signal processing method in the present embodiment includes:
the frequency synthesizer generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module divides the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the first local oscillation signal transmits a radio frequency signal with a modulation signal after passing through a power amplifier and a transmitting antenna on a TX path;
the second local oscillator signal enters the orthogonal down converter after passing through the orthogonal generator on an RX path;
amplifying the reflected signal received by the receiving antenna through a low noise amplifier and/or a second amplifier;
and the second local oscillator signal and the amplified reflection signal are multiplied in the orthogonal down converter to realize down conversion, an intermediate frequency signal is output, and the intermediate frequency signal is output to an external baseband processing unit.
The local oscillator signal in this embodiment has the same frequency as the transmission and reception signal of the radio frequency transceiver, and the local oscillator signal may be directly applied to the TX path and the RX path.
Referring to fig. 3, a signal processing system in a second embodiment of the present invention includes a local oscillator signal generating unit 10 and a radio frequency transceiver 20, where the radio frequency transceiver includes a local oscillator network input module 21, a TX path and an RX path, where:
the local oscillation signal generating unit 10 comprises a frequency synthesizer 11 and a first amplifier 12, wherein the frequency synthesizer 11 generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier 12;
the local oscillator network input module 21 is configured to divide the local oscillator signal into a plurality of first local oscillator signals and a plurality of second local oscillator signals;
the TX path (signal transmission path) includes a first frequency multiplier or first frequency divider 26, a power amplifier and a transmitting antenna 22, the first local oscillator signal is frequency-multiplied or frequency-divided by the first frequency multiplier or first frequency divider 26, and enters the power amplifier and the transmitting antenna 22 to transmit the radio frequency signal with the modulated signal;
the RX path (signal receiving path) includes a second frequency multiplier or second frequency divider 27, an orthogonal generator 23, and an orthogonal down converter 24, where the second local oscillator signal is frequency-multiplied or frequency-divided by the second frequency multiplier or second frequency divider 27, enters the orthogonal generator 23 and then enters the orthogonal down converter 24, and is multiplied by the reflected signal received by the receiving antenna in the orthogonal down converter 24 to realize down conversion, and output an intermediate frequency signal.
Preferably, the present embodiment further includes a noise amplifier and/or a second amplifier 25, which is used for amplifying the reflected signal received by the receiving antenna.
Accordingly, referring to fig. 4, the signal processing method in the present embodiment includes:
the frequency synthesizer generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module divides the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the first local oscillator signal is subjected to frequency multiplication or frequency division on a TX path through a first frequency multiplier or a first frequency divider, enters a power amplifier and a transmitting antenna and then transmits a radio frequency signal with a modulation signal;
the second local oscillator signal is subjected to frequency multiplication or frequency division on an RX path through a second frequency multiplier or a second frequency divider, enters the orthogonal generator and then enters the orthogonal down converter;
amplifying the reflected signal received by the receiving antenna through a low noise amplifier and/or a second amplifier;
and the second local oscillator signal and the amplified reflection signal are multiplied in the orthogonal down converter to realize down conversion, an intermediate frequency signal is output, and the intermediate frequency signal is output to an external baseband processing unit.
Different from the first embodiment, the local oscillator signal in this embodiment has a different transmitting and receiving frequency from that of the radio frequency transceiver, and the local oscillator signal needs to be subjected to frequency multiplication or frequency division by a frequency multiplier or a frequency divider and then applied to the TX path and the RX path.
The invention also discloses a millimeter wave sensor chip which comprises the signal processing system in the embodiment. Preferably, the operating frequency band of the millimeter wave sensor chip (the radio frequency signal, the first local oscillation signal, and the second local oscillation signal) is a K/Ka frequency band, and of course, in other embodiments, the operating frequency band may also be other frequency bands.
Different application scenes have different requirements on the number of millimeter wave receiving and transmitting channels, some of the millimeter wave receiving and transmitting channels need to be transmitted and received one by one, some of the millimeter wave receiving and transmitting channels need to be transmitted and received more than one, and some of the millimeter wave receiving and transmitting channels need to be transmitted and received more than one, so that different perception dimensions and different accuracies are met. The chip with fixed number of the transmitting and receiving channels only covers part of application scenes, and higher flexibility and expansibility can be provided through multi-chip cascade.
The TX path and the RX path in the foregoing embodiment may be one or multiple paths, for example, in this embodiment, the TX path and the RX path include M TX paths and N RX paths, and accordingly, the local oscillator network input module divides the local oscillator signal into M first local oscillator signals and N second local oscillator signals, and sends the M first local oscillator signals and the N second local oscillator signals to each TX path and each RX path, respectively. The local oscillator paths (TX path and RX path) have flexible expansibility, and a large-scale array can be realized through a power divider, an amplifier and the like.
The local oscillator signal generating unit and the radio frequency transceiver in the invention can be integrated on the same chip (without multi-chip cascade), and the local oscillator signal is directly sent to the local oscillator network input module in the chip; or integrated on different chips (for multi-chip cascade), the local oscillator signal is sent to the outside of the chip, and then input to the local oscillator network input module of the chip or other chips through packaging, a printed circuit board, a cable, a power divider, an amplifier and the like.
The invention can support multi-transmission and multi-reception and multi-chip cascade, the multi-transmission and multi-reception can realize more sensing dimensions, higher sensing precision and longer sensing distance, and the multi-chip cascade can form a chip array with larger receiving and transmitting scale by a plurality of chips so as to meet the application scene with higher requirements, thereby being widely applicable to the sensor application in the fields of Internet of things and artificial intelligence.
It should be understood that in the above embodiments, some signal amplifiers (buffers) are inserted into the paths for signal amplification according to the signal strength, such as the output of the frequency synthesizer, the input of the local oscillator signal, the RX path/TX path, the rf signal transmitting path, the reflected signal receiving path, and so on.
According to the technical scheme, the invention has the following beneficial effects:
the invention can support multi-transmitting multi-receiving and multi-chip cascade, and can be widely applied to sensors in the fields of Internet of things and artificial intelligence;
the invention has the characteristics of complete functions, flexible use and expandability, can completely separate signal generation and signal receiving and transmitting, can also be organically fused in the same chip, has flexible expansibility on local oscillator channels, and can realize large-scale array.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A signal processing method, characterized in that the signal processing method comprises:
the frequency synthesizer generates a modulation signal, and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module divides the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the first local oscillation signal transmits a radio frequency signal with a modulation signal after passing through a power amplifier and a transmitting antenna on a TX path;
and the second local oscillator signal enters the orthogonal down converter after passing through the orthogonal generator on an RX path, is multiplied by a reflected signal received by the receiving antenna in the orthogonal down converter to realize down conversion, and outputs an intermediate frequency signal.
2. The signal processing method of claim 1, further comprising:
the first local oscillator signal is subjected to frequency multiplication or frequency division through a first frequency multiplier or a first frequency divider;
and/or the second local oscillator signal is subjected to frequency multiplication or frequency division through a second frequency multiplier or a second frequency divider.
3. The signal processing method of claim 1, further comprising:
and amplifying the reflected signal received by the receiving antenna by a low noise amplifier and/or a second amplifier.
4. A signal processing system, comprising a local oscillator signal generating unit and a radio frequency transceiver, wherein the radio frequency transceiver comprises a local oscillator network input module, a TX path and an RX path, and wherein:
the local oscillation signal generating unit comprises a frequency synthesizer and a first amplifier, wherein the frequency synthesizer generates a modulation signal and outputs a local oscillation signal after the modulation signal is amplified by the first amplifier;
the local oscillator network input module is used for dividing the local oscillator signals into a plurality of first local oscillator signals and second local oscillator signals;
the TX path comprises a power amplifier and a transmitting antenna, and a first local oscillator signal transmits a radio frequency signal with a modulated signal after passing through the power amplifier and the transmitting antenna;
and the RX path comprises an orthogonal generator and an orthogonal down converter, the second local oscillator signal enters the orthogonal down converter after passing through the orthogonal generator, and is multiplied by a reflected signal received by the receiving antenna in the orthogonal down converter to realize down conversion, and an intermediate frequency signal is output.
5. The signal processing system of claim 4, wherein the TX path further comprises a first frequency multiplier or a first frequency divider for multiplying or dividing a first local oscillator signal; and/or, the RX path further includes a second frequency multiplier or a second frequency divider for multiplying or dividing the frequency of the second local oscillator signal.
6. The signal processing system of claim 4, further comprising:
and the noise amplifier and/or the second amplifier are/is used for amplifying the reflected signal received by the receiving antenna.
7. The signal processing system of claim 4, wherein the local oscillator signal generating unit and the radio frequency transceiver are integrated on a same chip.
8. The signal processing system of claim 4, wherein the local oscillator signal generating unit and the radio frequency transceiver are respectively integrated on different chips.
9. A millimeter-wave sensor chip characterized in that it comprises a signal processing system according to any one of claims 4 to 8.
10. The millimeter-wave sensor chip according to claim 9, wherein the operating frequency band of the millimeter-wave sensor chip is the K/Ka frequency band.
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| CN202011141820.4A CN112305515A (en) | 2020-10-22 | 2020-10-22 | Signal processing method, signal processing system and millimeter wave sensor chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113484828A (en) * | 2021-07-08 | 2021-10-08 | 苏州矽典微智能科技有限公司 | Cascade extended millimeter wave sensor chip |
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| WO2017219954A1 (en) * | 2016-06-20 | 2017-12-28 | 深圳市华讯星通讯有限公司 | Communication transceiver |
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