CN113156378A - One-transmitting and double-receiving continuous wave radar front end - Google Patents
One-transmitting and double-receiving continuous wave radar front end Download PDFInfo
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- CN113156378A CN113156378A CN202110514092.5A CN202110514092A CN113156378A CN 113156378 A CN113156378 A CN 113156378A CN 202110514092 A CN202110514092 A CN 202110514092A CN 113156378 A CN113156378 A CN 113156378A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 13
- 230000010355 oscillation Effects 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 claims abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 5
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- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/2813—Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays
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Abstract
The invention discloses a continuous wave radar front end with one transmitting and two receiving, which comprises a frequency synthesis module, a transmitter module, a receiver module, a transmitting antenna and a receiving antenna, wherein the frequency synthesis module generates local oscillation signals and linear continuous wave signals required by the transmitter; the transmitter module performs frequency multiplication on the linear continuous wave signal, then performs up-conversion on the frequency-multiplied signal and the local oscillator signal, the up-converted signal is divided into three paths by a power divider, one path is subjected to power amplification and then transmitted by a transmitting antenna, and the other two paths are used as the local oscillator signal of the receiver; the receiver module carries out down-conversion on the signals received by the receiving antenna and the local oscillator signals, outputs intermediate frequency signals, and outputs the intermediate frequency signals to the signal processor after filtering and amplification to extract radar target information. The invention solves the problems that the existing single-transmitting single-receiving radar front end is low in measurement precision and cannot measure the target direction.
Description
Technical Field
The invention relates to the technical field of radars, in particular to a one-transmitting and two-receiving continuous wave radar front end.
Background
Radar is a system that searches for an object by modulating a waveform and transmitting electromagnetic energy to a certain area of space through a directional antenna. Part of electromagnetic energy radiated by a transmitter at the front end of the radar system is reflected by a target, and a transmitted signal is captured by a receiver at the front end of the radar system, so that information extraction of the target, such as azimuth, distance, speed and other target characteristics, is carried out. With the continuous progress of radar technology, radar has been widely applied to navigation and detection in different occasions. The method is divided into the following steps according to the types of working waveforms: continuous wave radar and pulse radar. A continuous wave radar is a radar that continuously emits electromagnetic energy, with both the transmit and receive channels operating simultaneously. Compared with pulse radar, the average power is higher, even if the peak power is slightly lower, larger signal capability can be obtained, larger time-bandwidth product can be easily obtained, and thus the distance resolution and the speed resolution of the continuous wave radar are higher.
The front end of the existing miniaturized single-transmitting single-receiving continuous wave radar has the defects of low measurement precision, incapability of measuring the direction of a target and the like. Therefore, how to improve the measurement accuracy of the radar system and realize the angle measurement of the miniaturized radar is a problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a one-transmitting and two-receiving continuous wave radar front end, and solves the problems that the existing single-transmitting and single-receiving radar system is low in measurement precision and cannot measure the target direction.
The technical solution for realizing the purpose of the invention is as follows: a one-transmitting-and-double-receiving continuous wave radar front end comprises a frequency synthesis module, a transmitter module, a receiver module, a transmitting antenna and a receiving antenna, wherein the frequency synthesis module generates local oscillation signals and linear continuous wave signals required by the transmitter; the transmitter module performs frequency multiplication on the linear continuous wave signal, then performs up-conversion on the frequency-multiplied signal and the local oscillator signal, the up-converted signal is divided into three paths by a power divider, one path is amplified in power and transmitted by the transmitting antenna, and the other two paths are used as the local oscillator signal of the receiver; and the receiver module performs down-conversion on the signals received by the receiving antenna and the local oscillator signals to output intermediate frequency signals, and the intermediate frequency signals are filtered and amplified and then output to a signal processor to extract radar target information.
As a preferred embodiment, the frequency synthesis module includes a crystal oscillator, a dual-path amplifier, a phase-locked loop and a DDS module;
the crystal oscillator generates signals and outputs the signals to the double-path amplifier, the double-path amplifier amplifies the signals and outputs the signals to the two paths of phase-locked loops, one path of phase-locked loops outputs local oscillator signals to the transmitter module, the other path of phase-locked loops outputs DDS module working signals to the DDS module, and the DDS module outputs continuous wave signals to the transmitter module.
As a preferred embodiment, the transmitter module includes a low noise amplifier, a frequency multiplication link, a mixer, a power divider, a directional coupler, and a power amplifier;
the low noise amplifier amplifies the continuous wave signal output by the DDS module and outputs the amplified continuous wave signal to a frequency multiplication link, the frequency multiplication link multiplies the frequency of the continuous wave signal by sixteen times and outputs the multiplied continuous wave signal to a frequency mixer, the frequency mixer up-converts the continuous wave signal and a local oscillator signal and outputs the frequency signal to a power divider, a first output end of the power divider outputs one path of signal to the power amplifier, the power amplifier outputs the amplified transmission signal to a transmitting antenna, a second output end of the power amplifier outputs one path of signal to the directional coupler, and the directional coupler divides the signal into two paths and transmits the two paths of signal to the receiver module respectively.
In a preferred embodiment, the transmitting antenna is a single antenna, and the receiving antenna is a dual antenna.
As a preferred embodiment, the receiver module comprises a low noise amplifier, a filter, a mixer, an automatic gain control circuit;
the receiver module is connected with two receiving antennas, the receiving antennas transmit received echo signals to the filter, the filter transmits the filtered signals to the low-noise amplifier, the low-noise amplifier transmits the amplified signals to the frequency mixer, the frequency mixer performs down-conversion on the signals and local oscillation signals to obtain intermediate-frequency signals, the intermediate-frequency signals pass through the low-pass filter to remove clutter interference, the automatic gain control circuit ensures that the signal amplitude is stable, and then the signals are transmitted to the signal processor to be subjected to subsequent signal processing.
In a preferred embodiment, the transmitting antenna and the receiving antenna are both horn antennas.
As a preferred embodiment, the mixer is a passive mixer.
In a preferred embodiment, the frequency doubling chain in the transmitter includes frequency doubling blocks, and filters and low noise amplifiers are arranged between the frequency doubling blocks.
Compared with the prior art, the invention has the following remarkable advantages: a radar system with one transmitting and two receiving functions receives echo signals of a single target through a double horn antenna, is good in directivity, can realize angle measurement and speed measurement of the single target, and improves measurement precision and accuracy.
Drawings
FIG. 1 is a system configuration diagram of the present invention
FIG. 2 is a diagram of a frequency synthesis module according to the present invention
FIG. 3 is a block diagram of a transmitter according to the present invention
FIG. 4 is a block diagram of a receiver module according to the present invention
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments
As shown in fig. 1, a one-transmit-two-receive continuous wave radar front end includes a frequency synthesis module, a transmitter module, a receiver module, a transmitting antenna and a receiving antenna; the frequency synthesis module is used for generating local oscillation signals and linear continuous wave signals required by a transmitter; the transmitter module is used for carrying out frequency multiplication on a linear continuous wave signal generated by the frequency synthesis module, then carrying out up-conversion on the frequency-multiplied signal and a local oscillator signal, dividing the up-converted signal into three paths by a power divider, transmitting one path of the signal by a transmitting antenna after power amplification, and using the other two paths of the signal as the local oscillator signal of a receiver; the transmitting antenna is used for transmitting the processed continuous wave signal; the receiving antenna is used for receiving echo signals and transmitting the echo signals to the receiver; and the receiver module is used for mixing the signals received by the receiving antenna with the local oscillator signals and outputting intermediate frequency signals, and the intermediate frequency signals are filtered and amplified and then output to the signal processor to extract radar target information.
In some embodiments, as shown in fig. 2, the frequency synthesis module includes a crystal oscillator, a dual path amplifier, a phase locked loop module, and a DDS module. A crystal oscillator generates a 20MHz reference clock, and the reference clock is respectively input into two paths of phase-locked loop modules through a two-channel amplifier, wherein one path generates a 1GHz DDS clock signal, and the other path generates a 4.1GHz transmitted up-conversion local oscillator signal; the DDS chip is controlled and configured by a microprocessor, and the output frequency of the DDS signal is 200 MHz-225 MHz.
In some embodiments, as shown in fig. 3, the transmitter module includes a low noise amplifier, a frequency doubling chain, a mixer, a power divider, and a power amplifier. After receiving a continuous wave signal of 200 MHz-225 MHz, the low noise amplifier amplifies the signal to 12dBm and outputs the signal to a frequency doubling link, the frequency doubling link performs frequency doubling on the signal for three times of 2 times, 2 times and 2 times, and then outputs the signal with the frequency of 1.6 GHz-1.8 GHz to a mixer, the mixer performs up-conversion on the continuous wave signal of 1.6 GHz-1.8 GHz and a local oscillator signal of 4.1GHz to generate a signal with the central frequency of 5.8GHz and the bandwidth of 200MHz, and outputs the signal to a power divider; a first output end of the power divider outputs a path of signal to the power amplifier, and a second output end and a third output end output local oscillation signals required by the receiver to the receiver; the power amplifier amplifies the signal power to 32.5dBm and transmits the signal power to a transmitting antenna for transmitting.
In some embodiments, as shown in fig. 4, the receiver module includes a low noise amplifier, a filter, a mixer, an automatic gain control circuit; the receiver module is connected with the two receiving antennas and transmits the received echo signals to the filter, the filter transmits the filtered signals to the low-noise amplifier, and the low-noise amplifier transmits the amplified signals to the mixer; the mixer carries out down-conversion on the amplified signal and the local oscillator signal to obtain an intermediate frequency signal, and the intermediate frequency signal passes through a two-stage low-pass filter to remove clutter interference and local oscillator leakage; the loss of the signal is larger after the signal passes through the down-conversion and the two-stage low-pass filter, so that an intermediate frequency amplifier is added behind the low-pass filter, the amplified intermediate frequency amplifier is matched with an automatic gain control circuit to ensure the amplitude of the intermediate frequency signal to be stable, and then the processed intermediate frequency signal is transmitted to a signal processor to extract target information.
Claims (10)
1. A one-transmitting and two-receiving continuous wave radar front end is characterized by comprising a frequency synthesis module, a transmitter module, a receiver module, a transmitting antenna and a receiving antenna;
the frequency synthesis module generates local oscillation signals and linear continuous wave signals required by a transmitter; the transmitter module performs frequency multiplication on the linear continuous wave signal, then performs up-conversion on the frequency-multiplied signal and the local oscillator signal, the up-converted signal is divided into three paths by a power divider, one path is subjected to power amplification and then transmitted by a transmitting antenna, and the other two paths are used as the local oscillator signal of the receiver; the receiver module carries out down-conversion on the signals received by the receiving antenna and the local oscillator signals, outputs intermediate frequency signals, and outputs the intermediate frequency signals to the signal processor after filtering and amplification to extract radar target information.
2. The front-end of a one-shot double-receive continuous wave radar according to claim 1, wherein the frequency synthesis module comprises a crystal oscillator, a two-way amplifier, a phase-locked loop and a DDS module;
the crystal oscillator generates signals and outputs the signals to the double-path amplifier, the double-path amplifier amplifies the signals and outputs the signals to the two paths of phase-locked loops, one path of phase-locked loops outputs local oscillator signals to the transmitter module, the other path of phase-locked loops outputs DDS module working signals to the DDS module, and the DDS module outputs continuous wave signals to the transmitter module.
3. The one-and-two-receive continuous wave radar front end of claim 1, wherein the transmitter module comprises a low noise amplifier, a frequency doubling link, a mixer, a power divider, a power amplifier;
the low-noise amplifier amplifies a continuous wave signal output by the DDS module and outputs the signal to a frequency multiplication link, the frequency multiplication link performs octave frequency multiplication on the signal and outputs the signal to a mixer, the mixer performs up-conversion on the continuous wave signal and a local oscillator signal and outputs the signal to the power divider, a first output end of the power divider outputs a path of signal to the power amplifier, and the power amplifier outputs an amplified transmission signal to the transmitting antenna; and the second output end and the third output end of the power divider output local oscillation signals to the receiver module.
4. The front-end of a single-transmit-double-receive continuous wave radar according to claim 1, wherein the transmit antenna is a single antenna and the receive antenna is a double antenna.
5. The one-and-two-receive continuous wave radar front end of claim 1, wherein the receiver module comprises a low noise amplifier, a filter, a mixer, an automatic gain control circuit;
the receiver module is connected with two receiving antennas, the receiving antennas transmit received echo signals to the filter, the filter transmits the filtered signals to the low-noise amplifier, the low-noise amplifier transmits the amplified signals to the frequency mixer, the frequency mixer performs down-conversion on the signals and local oscillation signals to obtain intermediate-frequency signals, the intermediate-frequency signals pass through the low-pass filter to remove clutter interference, the automatic gain control circuit ensures that the signal amplitude is stable, and then the signals are transmitted to the signal processor to be subjected to subsequent signal processing.
6. The front-end of a one-shot two-shot continuous wave radar according to claim 1, wherein the transmit antenna and the receive antenna are each horn antennas.
7. The front-end of a one-and-two-receive continuous wave radar of claim 1, wherein the mixer is a passive mixer.
8. The front-end of a pitch-catch and double-catch continuous wave radar according to claim 2, wherein the phase-locked loop and the DDS are controlled by an MCU.
9. The front-end of claim 3, wherein the frequency doubling chain comprises a third frequency doubling with a filter and a low noise amplifier between the frequency doublers.
10. The front-end of a one-and-two-receive continuous wave radar as claimed in claim 3, wherein the power divider is a one-to-three power divider.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110514092.5A CN113156378A (en) | 2021-05-11 | 2021-05-11 | One-transmitting and double-receiving continuous wave radar front end |
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| CN202110514092.5A CN113156378A (en) | 2021-05-11 | 2021-05-11 | One-transmitting and double-receiving continuous wave radar front end |
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| CN202110514092.5A Pending CN113156378A (en) | 2021-05-11 | 2021-05-11 | One-transmitting and double-receiving continuous wave radar front end |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488114A (en) * | 2021-12-31 | 2022-05-13 | 北京航天广通科技有限公司分公司 | Radar radio frequency front end and speed measuring radar |
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- 2021-05-11 CN CN202110514092.5A patent/CN113156378A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488114A (en) * | 2021-12-31 | 2022-05-13 | 北京航天广通科技有限公司分公司 | Radar radio frequency front end and speed measuring radar |
| CN114488114B (en) * | 2021-12-31 | 2024-10-18 | 北京航天广通科技有限公司分公司 | Radar radio frequency front end and speed measuring radar |
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