CN111865242A - Radar gain closed-loop control method, device and system - Google Patents
Radar gain closed-loop control method, device and system Download PDFInfo
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- CN111865242A CN111865242A CN202010704402.5A CN202010704402A CN111865242A CN 111865242 A CN111865242 A CN 111865242A CN 202010704402 A CN202010704402 A CN 202010704402A CN 111865242 A CN111865242 A CN 111865242A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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Abstract
The invention provides a radar gain closed-loop control method, which comprises the following steps: acquiring digital intermediate frequency data; setting a threshold value; then, traversing and counting the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value; counting the threshold of the intermediate frequency data which is greater than the set threshold in the threshold comparison process; after counting statistics is completed, proportion calculation is carried out, and the intermediate frequency data proportion K larger than a set threshold value is calculated; and inquiring the proportion-gain adjustment table according to K to obtain an adjustment proportion coefficient corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier, and then calculating the current gain adjustment proportion corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier for acting on the low noise amplifier and/or the intermediate frequency signal amplifier. The present invention provides a more flexible and customizable AGC mechanism. The invention also provides a radar gain closed-loop control device and a system.
Description
Technical Field
The invention belongs to the technical field of millimeter wave radars, and particularly relates to a radar gain closed-loop control method and a radar gain closed-loop control device.
Background
The target echo signals received by the radar and having a long distance or a small reflection area are often attenuated very weakly after being transmitted in space, and in order to acquire effective target echo signals, the target echo signals need to be amplified to a proper size to be subjected to frequency mixing and enter an acquisition system, and at the moment, the echo signals need to be amplified by a large factor, so that the gain can be amplified as much as possible in the process.
However, when the radar receives the target echo with a short distance or a large reflection area, the originally set large gain often causes signal saturation of the radar receiver, so that in order to effectively collect the echo signal of a strong reflection target, the overlarge amplification factor needs to be adjusted in a small direction, namely the gain is adjusted to be small, and the purpose of the method is to ensure that the radar receiver is not overloaded.
The gain adjustment can be manual or automatic. The manual gain control is mainly implemented by manually setting a fixed gain by an operator in advance according to the test experience of the operator, so that the echo signal is in a proper value. The Automatic Gain Control (AGC) is a closed-loop feedback control system, wherein the gain is automatically adjusted by a radar program or an AGC analog feedback circuit according to the strength of an echo signal, the gain is reduced when the echo is strong, and the gain is increased when the echo is weak. Radar agc has become an important component of radar signal processing and control technology.
Disclosure of Invention
The invention aims to provide a radar gain closed-loop control method, a device and a system, which can effectively utilize the range of a baseband ADC, reduce the loss of ADC conversion precision, avoid the occurrence of ADC input signal saturation phenomenon, enable the amplitude of an echo digital signal processed at the rear end to be stronger and have certain help for improving the target SNR. The embodiment of the invention adopts the technical scheme that:
the embodiment of the invention provides a radar gain closed-loop control method, which comprises the following steps:
acquiring digital intermediate frequency data;
setting a threshold value; then, traversing and counting the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value;
counting the threshold of the intermediate frequency data which is greater than the set threshold in the threshold comparison process;
after counting statistics is completed, proportion calculation is carried out, and the intermediate frequency data proportion K larger than a set threshold value is calculated;
and inquiring the proportion-gain adjustment table according to K to obtain an adjustment proportion coefficient corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier, and then calculating the current gain adjustment proportion corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier for acting on the low noise amplifier and/or the intermediate frequency signal amplifier.
Preferably, after calculating the intermediate frequency data proportion K larger than the set threshold, the proportion compensation is performed, and the proportion-gain adjustment table is inquired according to the compensated intermediate frequency data proportion K larger than the set threshold.
Further, the formula for the proportional compensation is expressed as:
K=Kxα
wherein alpha is a proportional compensation coefficient, fast adjustment is performed when alpha is larger than 1, normal adjustment is performed when alpha is equal to 1, and slow adjustment is performed when alpha is smaller than 1.
Further, the adjusting proportion coefficient corresponding to the low noise amplifier obtained by inquiring the proportion-gain adjusting table through the intermediate frequency data proportion K larger than the set threshold value is MapLNA(K) And/or the resulting scaling factor for the intermediate frequency signal amplifier is MapVGA(K)；
The current gain adjustment ratio for the low noise amplifier is expressed as:
βLNA=1-[K- MapLNA(K)]；
the current gain adjustment ratio for the intermediate frequency signal amplifier is expressed as:
βVGA=1-[K- MapVGA(K)]。
another embodiment of the present invention provides a radar gain closed-loop control apparatus, including: a digital signal processor;
the digital signal processor is configured to run a computer program, which when running executes the radar gain closed-loop control method described above.
Another embodiment of the present invention provides a radar gain closed-loop control system, including: the low-noise amplifier, the mixer, the intermediate frequency signal amplifier, the analog-to-digital converter and the digital signal processor;
The gain of the low noise amplifier and/or the intermediate frequency signal amplifier can be adjusted;
the input end of the low-noise amplifier is connected with a radar receiving signal, the output end of the low-noise amplifier is connected with one frequency mixing end of the frequency mixer, the other frequency mixing end of the frequency mixer is connected with a radar local oscillator signal, the output end of the frequency mixer is connected with the input end of the intermediate frequency signal amplifier, the output end of the intermediate frequency signal amplifier is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with one input end of the digital signal processor, and digital intermediate frequency data;
one output end of the digital signal processor is connected with the gain control end of the low noise amplifier, and/or the other output end of the digital signal processor is connected with the gain control end of the intermediate frequency signal amplifier;
the radar receiving signal is amplified by a high-frequency signal of a low-noise amplifier, then is subjected to frequency mixing with a radar local oscillator signal by a frequency mixer, and the obtained intermediate-frequency signal is amplified by an intermediate-frequency signal amplifier and subjected to analog-to-digital conversion by an analog-to-digital converter to obtain digitized intermediate-frequency data;
the digital signal processor is configured to run a computer program, which when running executes the radar gain closed-loop control method described above.
The invention has the advantages that:
1) the method can avoid the problem that the AGC automatic gain adjustment function based on a fixed analog circuit feedback mechanism of a radar baseband chip cannot be flexibly and effectively adapted to an actual radar system, and provides a more flexible and customizable AGC mechanism.
2) The conversion range of the ADC is effectively utilized, so that the conversion precision of the weak echo signal at the ADC is the highest, and the target SNR is improved to a certain extent.
3) The method of the invention is realized based on a computer program and can be iteratively upgraded along with a radar program.
4) The result can be compensated according to the actually set gain value.
Drawings
FIG. 1 is a schematic diagram of a radar gain closed-loop control system according to the present invention.
FIG. 2 is a schematic diagram of a radar gain closed-loop control method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides a radar gain closed-loop control system, as shown in fig. 1, including a low noise amplifier 2, a mixer 3, an intermediate frequency signal amplifier 4, an analog-to-digital converter 5, and a digital signal processor 7;
Low noise amplifiers, often referred to as LNAs, primarily amplify high frequency signals; an analog-to-digital converter, also known as ADC, for converting an analog signal into a digital signal; the intermediate frequency signal amplifier is used for amplifying the intermediate frequency signals after frequency mixing;
the gain of the low noise amplifier 2 and/or the intermediate frequency signal amplifier 4 can be adjusted;
the input end of the low noise amplifier 2 is connected with the radar receiving signal 1, the output end is connected with one mixing end of the mixer 3, the other mixing end of the mixer 3 is connected with the radar local oscillator signal 6, the output end of the mixer 3 is connected with the input end of the intermediate frequency signal amplifier 4, the output end of the intermediate frequency signal amplifier 4 is connected with the input end of the analog-to-digital converter 5, the output end of the analog-to-digital converter 5 is connected with one input end of the digital signal processor 7, and the digital intermediate frequency data 8 are sent to the digital signal processor 7;
one output end of the digital signal processor 7 is connected with the gain control end of the low noise amplifier 2, and the other output end is connected with the gain control end of the intermediate frequency signal amplifier 4;
it should be noted that the intermediate frequency data 8 is a statistical unit of a radar data frame, that is, digital sampling data of one radar pulse, which may be 256 sampling data or 512 sampling data, and the like;
The radar receiving signal 1 is amplified by a high-frequency signal of a low-noise amplifier 2, and then is mixed with a radar local oscillation signal 6 by a mixer 3, and an obtained intermediate-frequency signal is amplified by an intermediate-frequency signal amplifier and is subjected to analog-to-digital conversion by an analog-to-digital converter 5 to obtain digitized intermediate-frequency data 8;
the radar gain closed-loop control method provided by the embodiment of the invention is mainly realized by a computer program running in a digital signal processor 7;
firstly, acquiring digital intermediate frequency data; setting a threshold value; then, traversing and counting the intermediate frequency data 8, namely, comparing the intermediate frequency data 8 with a set threshold value 9; counting the threshold value 10 of the intermediate frequency data which is greater than the set threshold value in the threshold value comparison 9 process; after counting statistics is completed, calculating the proportion K of the intermediate frequency data which is greater than a set threshold value by a proportion calculation 11; then, performing proportion compensation 12, inquiring the compensated intermediate frequency data proportion K which is larger than the set threshold value through a proportion-gain adjustment table 13 to obtain an adjustment proportion coefficient corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier, and calculating the current gain adjustment proportion corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier for acting on the low noise amplifier and/or the intermediate frequency signal amplifier;
The formula for the proportional compensation 12 is expressed as:
K=Kxα
wherein alpha is a proportional compensation coefficient, fast adjustment is carried out when alpha is greater than 1, normal adjustment is carried out when alpha is equal to 1, and slow adjustment is carried out when alpha is less than 1;
the adjusted scaling factor corresponding to the low noise amplifier obtained by referring to the scaling-gain adjustment table 13 by the intermediate frequency data ratio K larger than the set threshold is MapLNA(K) The obtained adjusting proportion coefficient corresponding to the intermediate frequency signal amplifier is MapVGA(K)；
The current gain adjustment ratio for the low noise amplifier is expressed as:
βLNA=1-[K- MapLNA(K)]；
the current gain adjustment ratio for the intermediate frequency signal amplifier is expressed as:
βVGA=1-[K- MapVGA(K)]；
in one practical example, Map when K =0LNA(K)=5%，βLNA=1.05%, indicating that the low noise amplifier increases the gain; when K =50%, MapLNA(K)=20%，βLNA=70%, indicating that the low noise amplifier reduces the gain; when K =1%, MapLNA(K)=1%，βLNA=100%, the gain of the low noise amplifier is unchanged;
the procedure of the gain adjustment of the intermediate frequency signal amplifier is similar to the above example;
in some embodiments, the gain of the low noise amplifier 2 is adjusted alone, or the gain of the intermediate frequency signal amplifier 4 is adjusted alone, or the gains of the low noise amplifier 2 and the intermediate frequency signal amplifier 4 are adjusted simultaneously.
In some embodiments, the process of proportional compensation 12 may be omitted.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. A radar gain closed-loop control method is characterized by comprising the following steps:
acquiring digital intermediate frequency data;
setting a threshold value; then, traversing and counting the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value;
counting the threshold of the intermediate frequency data which is greater than the set threshold in the threshold comparison process;
after counting statistics is completed, proportion calculation is carried out, and the intermediate frequency data proportion K larger than a set threshold value is calculated;
and inquiring the proportion-gain adjustment table according to K to obtain an adjustment proportion coefficient corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier, and then calculating the current gain adjustment proportion corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier for acting on the low noise amplifier and/or the intermediate frequency signal amplifier.
2. The radar gain closed-loop control method of claim 1,
and after calculating the intermediate frequency data proportion K which is greater than the set threshold, carrying out proportion compensation, and inquiring a proportion-gain adjustment table according to the compensated intermediate frequency data proportion K which is greater than the set threshold.
3. The radar gain closed-loop control method of claim 2,
the formula for the proportional compensation is expressed as:
K=Kxα
wherein alpha is a proportional compensation coefficient, fast adjustment is performed when alpha is larger than 1, normal adjustment is performed when alpha is equal to 1, and slow adjustment is performed when alpha is smaller than 1.
4. The radar gain closed-loop control method of claim 1,
the adjusting proportion coefficient corresponding to the low noise amplifier obtained by inquiring the proportion-gain adjusting table through the intermediate frequency data proportion K larger than the set threshold value is MapLNA(K) And/or the resulting scaling factor for the intermediate frequency signal amplifier is MapVGA(K)；
The current gain adjustment ratio for the low noise amplifier is expressed as:
βLNA=1-[K- MapLNA(K)]；
the current gain adjustment ratio for the intermediate frequency signal amplifier is expressed as:
βVGA=1-[K- MapVGA(K)]。
5. a radar gain closed loop control apparatus, comprising: a digital signal processor;
the digital signal processor is used for running a computer program which is run to execute the radar gain closed-loop control method according to any one of claims 1 to 4.
6. A radar gain closed loop control system, comprising: the low-noise amplifier, the mixer, the intermediate frequency signal amplifier, the analog-to-digital converter and the digital signal processor;
the gain of the low noise amplifier and/or the intermediate frequency signal amplifier can be adjusted;
the input end of the low-noise amplifier is connected with a radar receiving signal, the output end of the low-noise amplifier is connected with one frequency mixing end of the frequency mixer, the other frequency mixing end of the frequency mixer is connected with a radar local oscillator signal, the output end of the frequency mixer is connected with the input end of the intermediate frequency signal amplifier, the output end of the intermediate frequency signal amplifier is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with one input end of the digital signal processor, and digital intermediate frequency data;
one output end of the digital signal processor is connected with the gain control end of the low noise amplifier, and/or the other output end of the digital signal processor is connected with the gain control end of the intermediate frequency signal amplifier;
the radar receiving signal is amplified by a high-frequency signal of a low-noise amplifier, then is subjected to frequency mixing with a radar local oscillator signal by a frequency mixer, and the obtained intermediate-frequency signal is amplified by an intermediate-frequency signal amplifier and subjected to analog-to-digital conversion by an analog-to-digital converter to obtain digitized intermediate-frequency data;
The digital signal processor is used for running a computer program which is run to execute the radar gain closed-loop control method according to any one of claims 1 to 4.
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Cited By (1)
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| CN114415124A (en) * | 2022-03-29 | 2022-04-29 | 深圳芯盛思技术有限公司 | Intermediate frequency signal automatic gain control method and device based on upper and lower threshold values |
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