CN111865242B - 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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- CN111865242B CN111865242B CN202010704402.5A CN202010704402A CN111865242B CN 111865242 B CN111865242 B CN 111865242B CN 202010704402 A CN202010704402 A CN 202010704402A CN 111865242 B CN111865242 B CN 111865242B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000004590 computer program Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 5
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Classifications
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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 performing traversal statistics on the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value; intermediate frequency data larger than a set threshold value is subjected to threshold value counting in the threshold value comparison process; after counting statistics is completed, proportion calculation is carried out, and intermediate frequency data proportion K which is larger than a set threshold value is calculated; and obtaining an adjustment proportion coefficient corresponding to the low-noise amplifier and/or the intermediate frequency signal amplifier according to the K query proportion-gain adjustment table, 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, customizable AGC mechanism. The invention also provides a radar gain closed-loop control device and a radar gain closed-loop control 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 device.
Background
The target echo signal received by the radar with a long distance or a small reflection area is very weak in attenuation after space propagation, and in order to acquire an effective target echo signal, the target echo signal needs to be amplified to a proper size to be mixed and enter an acquisition system, and at the moment, the echo signal needs to be amplified by a large multiple, so that the gain can be increased as much as possible in the process.
However, when the radar receives a target echo with a short distance or a large reflection area, the signal saturation of the radar receiver is often caused by the originally set large gain, so in order to effectively collect the echo signal of the strongly reflected target, the excessive amplification factor needs to be adjusted in a small direction, that is, the gain needs to be adjusted to be small, so as to ensure that the radar receiver is not overloaded.
Gain adjustment can be divided into manual and automatic. The manual gain control is mainly implemented by an operator manually setting a fixed gain according to the test experience of the operator in advance so that the echo signal is at a proper value. The Automatic Gain Control (AGC) is a closed loop feedback control system, in which the gain is automatically adjusted by a radar program or an AGC analog feedback circuit according to the intensity of an echo signal, the gain is reduced when the echo is strong, and the gain is increased when the echo is weak. Radar automatic gain control has become a very 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 radar gain closed-loop control device and a radar gain closed-loop control system, which can effectively utilize the range of a baseband ADC, reduce the loss of ADC conversion precision, avoid the saturation phenomenon of an ADC input signal, enable the amplitude of an echo digital signal processed by the rear end to be stronger, and have certain help to improve the target SNR. The technical scheme adopted by the embodiment of the invention is as follows:
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 performing traversal statistics on the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value;
intermediate frequency data larger than a set threshold value is subjected to threshold value counting in the threshold value comparison process;
after counting statistics is completed, proportion calculation is carried out, and intermediate frequency data proportion K which is larger than a set threshold value is calculated;
and obtaining an adjustment proportion coefficient corresponding to the low-noise amplifier and/or the intermediate frequency signal amplifier according to the K query proportion-gain adjustment table, 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.
More preferably, after calculating the intermediate frequency data proportion K larger than the set threshold value, proportion compensation is performed, and a proportion-gain adjustment table is inquired according to the compensated intermediate frequency data proportion K larger than the set threshold value.
Further, the formula for proportional compensation is expressed as:
K=Kxα
wherein, alpha is a proportional compensation coefficient, and is fast adjustment when more than 1, normal adjustment when equal to 1, and slow adjustment when less than 1.
Further, the adjustment scaling factor corresponding to the low noise amplifier obtained by querying the scaling-gain adjustment table is Map through the intermediate frequency data scaling K larger than the set threshold LNA (K) And/or the obtained adjustment scaling factor corresponding to the intermediate frequency signal amplifier is Map VGA (K)；
The current gain adjustment ratio corresponding to the low noise amplifier is expressed as:
β LNA =1-[K- Map LNA (K)]；
the current gain adjustment ratio corresponding to the intermediate frequency signal amplifier is expressed as:
β VGA =1-[K- Map VGA (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 used for running a computer program, and the computer program executes the radar gain closed-loop control method.
Another embodiment of the present invention provides a radar gain closed-loop control system, including: the device comprises a low noise amplifier, a mixer, an intermediate frequency signal amplifier, an analog-to-digital converter and a 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 the radar receiving signal, the output end of the low noise amplifier is connected with one mixing end of the mixer, the other mixing end of the mixer is connected with the radar local oscillation signal, the output end of the 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, and the output end of the analog-to-digital converter is connected with one input end of the digital signal processor and transmits digitized intermediate frequency data to the digital signal processor;
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, and then mixed with a radar local oscillation signal by a 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 digital intermediate frequency data;
the digital signal processor is used for running a computer program, and the computer program executes the radar gain closed-loop control method.
The invention has the advantages that:
1) The method can avoid the problem that the AGC automatic gain adjustment function based on the feedback mechanism of the fixed analog circuit, which is self-contained by the radar baseband chip, cannot be flexibly and effectively adapted to the 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 highest, and the target SNR is improved to a certain extent.
3) The method is realized based on a computer program and can be iteratively upgraded along with a radar program.
4) The result may be compensated for based on the actual 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
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a radar gain closed-loop control system, which is shown in fig. 1, and comprises 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, amplify primarily high frequency signals; analog-to-digital converters, also known as ADCs, are used to convert analog signals to digital signals; the intermediate frequency signal amplifier is used for amplifying the intermediate frequency signal after 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 of the low noise amplifier is connected with one mixing end of the mixer 3, the other mixing end of the mixer 3 is connected with the radar local oscillation 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, and the output end of the analog-to-digital converter 5 is connected with one input end of the digital signal processor 7 and sends digitized intermediate frequency data 8 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 takes the radar data frame as a statistical unit, that is, digital sampling data of one radar pulse, which may be 256 sampling data or 512 sampling data, etc.;
the radar receiving signal 1 is amplified by a high-frequency signal of a low-noise amplifier 2, and 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 digital intermediate frequency data 8;
the embodiment of the invention provides a radar gain closed-loop control method which 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 performing traversal statistics on the intermediate frequency data 8, namely performing threshold comparison 9 on the intermediate frequency data 8 and a set threshold; intermediate frequency data which is larger than a set threshold value in the threshold value comparison 9 process are subjected to threshold value counting 10; after counting statistics is completed, calculating intermediate frequency data proportion K which is larger than a set threshold value by proportion calculation 11; then, proportion compensation 12 is carried out, the compensated intermediate frequency data proportion K which is larger than a set threshold value is inquired 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 then the current gain adjustment proportion corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier is calculated and used for acting on the low noise amplifier and/or the intermediate frequency signal amplifier;
the formula for proportional compensation 12 is:
K=Kxα
wherein alpha is a proportional compensation coefficient, and is fast-speed adjustment when the alpha is larger than 1, normal adjustment when the alpha is equal to 1, and slow-speed adjustment when the alpha is smaller than 1;
the intermediate frequency data proportion K larger than the set threshold value is used for inquiring the proportion-gain adjustment table 13 to obtain an adjustment proportion coefficient corresponding to the low noise amplifier as Map LNA (K) The obtained adjustment scaling factor corresponding to the intermediate frequency signal amplifier is Map VGA (K)；
The current gain adjustment ratio corresponding to the low noise amplifier is expressed as:
β LNA =1-[K- Map LNA (K)]；
the current gain adjustment ratio corresponding to the intermediate frequency signal amplifier is expressed as:
β VGA =1-[K- Map VGA (K)]；
in a practical example, when k=0, map LNA (K)=5%，β LNA =1.05%, illustrating that the low noise amplifier increases the gain; map at k=50% LNA (K)=20%，β LNA =70%, illustrating that the low noise amplifier reduces the gain; map when k=1% LNA (K)=1%，β LNA =100%, low noise amplifier gain is unchanged;
the process of 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 both the low noise amplifier 2 and the intermediate frequency signal amplifier 4 are adjusted.
In some embodiments, the process of proportional compensation 12 may be omitted.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, 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 and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (2)
1. A method for closed loop control of radar gain, comprising:
acquiring digital intermediate frequency data;
setting a threshold value; then performing traversal statistics on the intermediate frequency data, namely comparing the intermediate frequency data with a set threshold value;
intermediate frequency data larger than a set threshold value is subjected to threshold value counting in the threshold value comparison process;
after counting statistics is completed, proportion calculation is carried out, and intermediate frequency data proportion K which is larger than a set threshold value is calculated;
obtaining an adjustment proportion coefficient corresponding to the low noise amplifier and/or the intermediate frequency signal amplifier according to the K query proportion-gain adjustment table, 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;
after calculating the intermediate frequency data proportion K which is larger than a set threshold value, carrying out proportion compensation, and inquiring a proportion-gain adjustment table according to the compensated intermediate frequency data proportion K which is larger than the set threshold value;
the formula for proportional compensation is expressed as:
K=Kxα
wherein alpha is a proportional compensation coefficient, and is fast-speed adjustment when the alpha is larger than 1, normal adjustment when the alpha is equal to 1, and slow-speed adjustment when the alpha is smaller than 1;
the intermediate frequency data proportion K larger than the set threshold value is used for inquiring the proportion-gain adjustment table to obtain an adjustment proportion coefficient corresponding to the low noise amplifier, wherein the adjustment proportion coefficient is Map LNA (K) And/or the obtained adjustment scaling factor corresponding to the intermediate frequency signal amplifier is Map VGA (K)；
The current gain adjustment ratio corresponding to the low noise amplifier is expressed as:
β LNA =1-[K- Map LNA (K)]；
the current gain adjustment ratio corresponding to the intermediate frequency signal amplifier is expressed as:
β VGA =1-[K- Map VGA (K)]。
2. a radar gain closed loop control apparatus, comprising: a digital signal processor;
the digital signal processor is configured to run a computer program which, when run, performs the radar gain closed-loop control method of claim 1.
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| CN1336727A (en) * | 2001-07-06 | 2002-02-20 | 中国科学院上海冶金研究所 | Pulse type counting method |
| CN201479082U (en) * | 2009-08-28 | 2010-05-19 | 杨大宁 | Intermediate frequency signal amplifier of navigation radar |
| CN105403866A (en) * | 2015-11-25 | 2016-03-16 | 中国电子科技集团公司第三十八研究所 | Real-time large dynamic synthetic aperture radar receiver |
| US9831836B1 (en) * | 2016-10-07 | 2017-11-28 | Silicon Laboratories Inc. | Automatic gain control (AGC) circuit and method to control amplifier gain based on a duration of an overload condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4399447B2 (en) * | 2006-10-27 | 2010-01-13 | Ｏｋｉセミコンダクタ株式会社 | OFDM receiver |
| US8169546B2 (en) * | 2008-02-19 | 2012-05-01 | Newport Media, Inc. | Technique for tuner automatic gain control circuit for mobile television applications |
| EP2546675B1 (en) * | 2010-03-09 | 2018-05-02 | Furukawa Electric Co., Ltd. | Pulse radar apparatus and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336727A (en) * | 2001-07-06 | 2002-02-20 | 中国科学院上海冶金研究所 | Pulse type counting method |
| CN201479082U (en) * | 2009-08-28 | 2010-05-19 | 杨大宁 | Intermediate frequency signal amplifier of navigation radar |
| CN105403866A (en) * | 2015-11-25 | 2016-03-16 | 中国电子科技集团公司第三十八研究所 | Real-time large dynamic synthetic aperture radar receiver |
| US9831836B1 (en) * | 2016-10-07 | 2017-11-28 | Silicon Laboratories Inc. | Automatic gain control (AGC) circuit and method to control amplifier gain based on a duration of an overload condition |
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