CN104393852A - Target signal automatic gain adjusting system and method - Google Patents
Target signal automatic gain adjusting system and method Download PDFInfo
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- CN104393852A CN104393852A CN201410723936.7A CN201410723936A CN104393852A CN 104393852 A CN104393852 A CN 104393852A CN 201410723936 A CN201410723936 A CN 201410723936A CN 104393852 A CN104393852 A CN 104393852A
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Abstract
The invention relates to a target signal automatic gain adjusting system and method and belongs to the technical field of information processing. A front-arranged gain adjusting circuit is utilized to convert target signals into voltage signals, the alternating current portion in the voltage signals is amplified and output, then a digital gain adjusting circuit is utilized to further amplify the output signals of the front-arranged gain adjusting circuit, target signals subjected to gain adjustment are sampled by an analog-digital conversion circuit to form target data, finally the gain coefficients are calculated according to the amplitude of the target data to control gains of the two-stage gain adjusting circuit, the amplitude of the target signals entering the analog-digital conversion circuit is controlled in the certain range, and the aim of automatic gain control can be achieved. The amplifying factor of the target signals can be controlled effectively, the amplitude of the target signals collected by the analog-digital converter is stabilized, and the signal saturation is restrained.
Description
Technical field
The present invention relates to a kind of automatic gain control system and method for echo signal, belong to technical field of information processing.
Background technology
In the guided missile based on infrared polynary system, the energy of detector induction targets, interference, background emission, export weak current signal, convert voltage signal to through preamplifier and amplify, then through the amplification adjustment etc. of late-class circuit, sending into analog to digital converter and complete analog-to-digital conversion, after missile-borne computer reads sampled data, missile-borne software processes data, thus finds out the position of real target, guides flight control system to control guided missile target and target kill.Target proximity the process of target kill is arrived because guided missile is transmitted into from blip steady, close along with missile-target distance, the energy that guided missile receives target emanation becomes rapidly large, the signal of telecommunication that Missile Information treatment system receives also becomes rapidly large, and in the process of guided missile close to target, if target throws in interference, then to receive the energy comparison of target and interference complicated for guided missile, the signal of telecommunication that Missile Information treatment system receives also complexity thereupon; The each channel circuit of guided missile and detector charactorizations there are differences, and this brings difficulty to the design of software algorithm in missile-borne computer, must take the dynamic auto regulation technology of corresponding signal gain.
Existing gain-adjusted technology is generally realized by programmable gain amplifier chip or the programmable gain amplifier circuit that utilizes resistor network, operational amplifier, control switch to form.Both gain-adjusted scopes and the equal underaction of step size controlling, if use resistor network and control switch ride gain, then take space large, the interface links of gain-adjusted is many, is unfavorable for the lifting of the miniaturized and signal to noise ratio of realizing circuit.
Summary of the invention
The object of this invention is to provide a kind of automatic gain control system and method for echo signal, with the problem of the gain-adjusted scope and the equal underaction of step size controlling that solve current gain-adjusted technology.
The present invention solves the problems of the technologies described above the automatic gain control system providing a kind of echo signal, this system comprises preamplifier gain regulating circuit, digital gain adjusting circuit, analog to digital conversion circuit and gain adjustment module, the input of described preamplifier gain regulating circuit is used for linking objective signal, output is connected with the input of digital gain adjusting circuit, for echo signal being converted to voltage signal and amplifying its AC portion, the described output of digital gain adjusting circuit is connected with the input of analog to digital conversion circuit, for amplifying further preamplifier gain regulating circuit output signal, analog-digital conversion circuit as described is used for the echo signal completing gain-adjusted being carried out sampling and forms target data, the input of described gain adjustment module is connected with the output of analog to digital conversion circuit, output control connection preamplifier gain regulating circuit and digital gain adjusting circuit, for calculating according to the crest meter of target data the gain that gain coefficient controls preamplifier gain regulating circuit and digital gain adjusting circuit.
Described preamplifier gain regulating circuit adopts zero-bias across resistance amplifying circuit, comprise field effect transistor and the first amplifier, described fet gate G is connected with the output of gain adjustment module, field effect transistor source S is connected to the output of the first amplifier by resistance R8, field effect transistor drain D is connected to the reverse input end of the first amplifier, connected by resistance R6 between described field effect transistor source S and drain D, the reverse input end of described first amplifier is used for being connected with echo signal.
Described digital gain adjusting circuit comprises the second amplifier and digital regulation resistance, the W end of described digital regulation resistance is connected to the reverse input end of the second amplifier, the A end of described digital regulation resistance is connected with the output of the second amplifier, connected by electric capacity between the regulation output end of described digital regulation resistance and A end, the SPI interface of described digital regulation resistance is connected with the output of gain adjustment module, and the reverse input end of described second amplifier is connected with the output of the first amplifier.
Described gain adjustment module is regulated by the gain coefficient of setting amplitude bound to preamplifier gain regulating circuit and digital gain adjusting circuit, when there is not the data point being greater than lower limit, gain upwards regulates, and when existence is greater than the data point of the upper limit, gain regulates downwards.
Described gain adjustment module when carrying out gain-adjusted to data point, the speed that its gain adjuster step changes according to data point amplitude and changing.
The present invention solves the problems of the technologies described above the automatic gain regulating method additionally providing a kind of echo signal, and the method comprises the following steps:
1) echo signal is converted into voltage signal, first time is carried out to the AC portion turned in rear voltage signal and amplifies and export;
2) signal amplifying output to first carries out second time and amplifies process;
3) echo signal after second time being amplified process is carried out sampling and is formed target data;
4) calculate gain coefficient to control according to the crest meter of target data the gain that first time amplifies and second time is amplified, echo signal is controlled in certain limit in amplitude, thus reaches the object of automatic growth control.
Described step 1) be realized by preamplifier gain regulating circuit, this preamplifier gain regulating circuit comprises field effect transistor and the first amplifier, described fet gate G is connected with the output of gain adjustment module, field effect transistor source S is connected to the output of the first amplifier by resistance R8, field effect transistor drain D is connected to the reverse input end of the first amplifier, connected by resistance R6 between described field effect transistor source S and drain D, the reverse input end of described first amplifier is used for being connected with echo signal.
Described step 2) be utilize digital gain adjusting circuit realiration, this digital gain adjusting circuit comprises the second amplifier and digital regulation resistance, the regulation output end of described digital regulation resistance is connected to the reverse input end of the second amplifier, the A end of described digital regulation resistance is connected with the output of the second amplifier, connected by electric capacity between the regulation output end of described digital regulation resistance and A end, the SPI interface of described digital regulation resistance is connected with the output of gain adjustment module, and the reverse input end of described second amplifier is connected with the output of the first amplifier.
Described step 4) regulated by the gain coefficient of setting amplitude bound to preamplifier gain regulating circuit and digital gain adjusting circuit, when there is not the data point being greater than lower limit, gain upwards regulates, and when existence is greater than the data point of the upper limit, gain regulates downwards.
Described step 4) when carrying out gain-adjusted to data point, the speed that its gain adjuster step changes according to data point amplitude and changing.
The invention has the beneficial effects as follows: the present invention utilizes preamplifier gain regulating circuit that echo signal is converted into voltage signal, then the AC portion in voltage signal amplified and export; Then the output signal of digital gain adjusting circuit to preamplifier gain regulating circuit is utilized to amplify further; Again the echo signal completing gain-adjusted is formed target data through analog to digital conversion circuit sampling; Finally calculate according to the crest meter of target data the gain that gain coefficient controls two-stage gain adjusting circuit, the echo signal amplitude entering analog to digital conversion circuit is controlled within the specific limits, reaches the object of automatic growth control.The present invention can the multiplication factor of effective control objectives signal, and the echo signal amplitude that stable mode number converter gathers, suppresses signal saturated phenomenon.
Accompanying drawing explanation
Fig. 1 is the structural representation of the automatic gain control system of echo signal;
Fig. 2 is the schematic diagram of preamplifier gain regulating circuit;
Fig. 3 is the schematic diagram of digital gain adjusting circuit.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
The embodiment of the automatic gain control system of a kind of echo signal of the present invention
The present invention adopts digitlization to regulate to regulate the gain of signal, Main Function carries out gain-adjusted in real time according to the size of echo signal and operating state, this automatic gain control system is made up of preamplifier gain regulating circuit, digital gain adjusting circuit, analog to digital conversion circuit, gain adjustment module, as shown in Figure 1.The input of preamplifier gain regulating circuit is used for linking objective signal, output is connected with the input of digital gain adjusting circuit, for echo signal being converted to voltage signal and amplifying its AC portion, the output of digital gain adjusting circuit is connected with the input of analog to digital conversion circuit, for amplifying further preamplifier gain regulating circuit output signal, analog to digital conversion circuit is used for the echo signal completing gain-adjusted being carried out sampling and forms target data, the input of gain adjustment module is connected with the output of analog to digital conversion circuit, output control connection preamplifier gain regulating circuit and digital gain adjusting circuit, for calculating according to the crest meter of target data the gain that gain coefficient controls preamplifier gain regulating circuit and digital gain adjusting circuit.
Formed for the physical circuit of polynary missile target signal to native system below and be described in detail.
Owing to having the highest detection degree when photovoltaic detector is operated in zero-bias state in polynary guided missile system, therefore preamplifier gain regulating circuit adopts zero-bias across resistance amplifying circuit, zero-bias has the feature of high ac gain, little output out-of-balance voltage across resistance amplifying circuit, meet system requirements, in addition because detector exports containing DC component, if the gain of this part signal too conference causes output direct current signal saturated, flood effective AC signal composition, therefore direct current signal gain should be less than AC signal gain as far as possible.The concrete principle of this circuit as shown in Figure 2, comprise field effect transistor Q1 and the first amplifier U1, fet gate G is connected with the output of gain adjustment module, field effect transistor source S is connected to the output of the first amplifier by resistance R8, field effect transistor source S also connects bigoted unit, this bigoted unit is made up of ground connection after resistance R7 and electric capacity C1 series connection, field effect transistor drain D is connected to the reverse input end of the first amplifier U1, connected by resistance R6 between field effect transistor source S and drain D, the reverse input end of the first amplifier is connected with echo signal, the positive input ground connection of the first amplifier, and connected by diode between the positive input of the first amplifier and negative input, in case stop signal flows into from the positive input of the first amplifier.
The operation principle of preamplifier gain regulating circuit is as follows: gain adjustment module controls the operating state of field effect transistor Q1, when field effect transistor Q1 conducting, first amplifier feedback signal directly accesses the reverse input end of the first amplifier through resistance R8 and field effect transistor Q1, resistance R6 short circuit is fallen, now amplification coefficient is only relevant with R8, when field effect transistor Q1 not conducting, first amplifier feedback signal accesses the reverse input end of the first amplifier through resistance R8 and resistance R6, and now amplification coefficient is relevant with R8 and R6.This circuit, by switching the operating state of field effect transistor, controls the change of feedback network circuit form, thus reaches direct current and be less than across the change of resistance handoff gain the object exchanged across resistance, realizes two grades of adjustable gains.
Due to the restriction in space, preamplifier gain regulating circuit only achieves two grades of adjustable gain, at the digital gain adjusting circuit of rear class design, need to realize multistage gain adjustable, this circuit adopts digital regulation resistance to carry out multistage adjustment, as shown in Figure 3, comprise operational amplifier U1 and digital regulation resistance U2, the regulation output end W of digital regulation resistance U1 is connected to the reverse input end of operational amplifier U1, the A end of digital regulation resistance U2 is connected with the output of operational amplifier U1, connected by electric capacity between the regulation output end of digital regulation resistance U2 and A end, the reverse input end of operational amplifier U1 is connected with the output of the first amplifier, the positive input of operational amplifier U1 passes through grounding through resistance, the SPI interface of digital regulation resistance U2 is connected with the output of gain adjustment module.Gain adjustment module by the adjustment of the SPI Interface Controller resistance of digital regulation resistance, thus realizes gain-adjusted.
Analog to digital conversion circuit selects precision and switching rate to meet system requirements analog to digital converter, is equipped with peripheral circuit and realizes.
In the present embodiment, gain adjustment module operates on missile-borne computer, mainly judge direction of gain adjustment and step-length according to the amplitude of data point on each passage, setting lower magnitude limits is LOW, the amplitude upper limit 1 is HIGH, the amplitude upper limit 2 is HIGHER, when each passage does not all exist the data point being greater than LOW, gain upwards regulates; When there being a passage existence to be greater than the data point of HIGH, gain regulates downwards; Default gain regulates step-length to be X, if there are continuous two periodicity strong points to be greater than HIGHER, then adjusting step-length is Y, and the amplitude bound of this module and step-length can adjust according to embody rule system.
The course of work of the automatic gain control system of echo signal provided by the present invention is as follows: the echo signal that multielement infrared detector exports is converted into voltage signal by preamplifier gain regulating circuit, then amplifies the AC portion in voltage signal and exports; The output signal of digital gain adjusting circuit to preamplifier gain regulating circuit is amplified further; The echo signal completing gain-adjusted forms target data through analog to digital conversion circuit sampling, the gain-adjusted algoritic module operated on missile-borne computer calculates according to the crest meter of target data the gain that gain coefficient controls two-stage gain adjusting circuit, the echo signal amplitude entering analog to digital conversion circuit is controlled within the specific limits, reaches the object of automatic growth control.
The embodiment of the automatic gain regulating method of a kind of echo signal of the present invention
The method adopts two-stage to amplify process, first echo signal is converted into voltage signal, carries out first time amplify and export the AC portion in converted voltage signal; Then second time is carried out to the amplifying signal exported and amplify process; Echo signal after again second time being amplified process is carried out sampling and is formed target data; Finally calculate gain coefficient to control according to the crest meter of target data the gain that first time amplifies and second time is amplified, echo signal is controlled in certain limit in amplitude, thus reaches the object of automatic growth control.
First time amplify process and second time amplify process adopt physical circuit as shown in Figures 2 and 3, be described in detail in last embodiment, it is no longer repeated here.
When the method is applied to infrared polynary missile target, the control procedure of gain-adjusted realizes on missile-borne computer, direction of gain adjustment and step-length is judged according to the amplitude of data point on each passage, setting lower magnitude limits is LOW, the amplitude upper limit 1 is HIGH, the amplitude upper limit 2 is HIGHER, and when each passage does not all exist the data point being greater than LOW, gain upwards regulates; When there being a passage existence to be greater than the data point of HIGH, gain regulates downwards; Default gain regulates step-length to be X, if there are continuous two periodicity strong points to be greater than HIGHER, then adjusting step-length is Y, and amplitude bound and step-length can adjust according to embody rule system.
Claims (10)
1. the automatic gain control system of an echo signal, it is characterized in that, this system comprises preamplifier gain regulating circuit, digital gain adjusting circuit, analog to digital conversion circuit and gain adjustment module, the input of described preamplifier gain regulating circuit is used for linking objective signal, output is connected with the input of digital gain adjusting circuit, for echo signal being converted to voltage signal and amplifying its AC portion, the described output of digital gain adjusting circuit is connected with the input of analog to digital conversion circuit, for amplifying further preamplifier gain regulating circuit output signal, analog-digital conversion circuit as described is used for the echo signal completing gain-adjusted being carried out sampling and forms target data, the input of described gain adjustment module is connected with the output of analog to digital conversion circuit, output control connection preamplifier gain regulating circuit and digital gain adjusting circuit, for calculating according to the crest meter of target data the gain that gain coefficient controls preamplifier gain regulating circuit and digital gain adjusting circuit.
2. the automatic gain control system of echo signal according to claim 1, it is characterized in that, described preamplifier gain regulating circuit adopts zero-bias across resistance amplifying circuit, comprise field effect transistor and the first amplifier, described fet gate G is connected with the output of gain adjustment module, field effect transistor source S is connected to the output of the first amplifier by resistance R8, field effect transistor drain D is connected to the reverse input end of the first amplifier, connected by resistance R6 between described field effect transistor source S and drain D, the reverse input end of described first amplifier is used for being connected with echo signal.
3. the automatic gain control system of echo signal according to claim 2, it is characterized in that, described digital gain adjusting circuit comprises the second amplifier and digital regulation resistance, the W end of described digital regulation resistance is connected to the reverse input end of the second amplifier, the A end of described digital regulation resistance is connected with the output of the second amplifier, connected by electric capacity between the regulation output end of described digital regulation resistance and A end, the SPI interface of described digital regulation resistance is connected with the output of gain adjustment module, the reverse input end of described second amplifier is connected with the output of the first amplifier.
4. the automatic gain control system of echo signal according to claim 3, it is characterized in that, described gain adjustment module is regulated by the gain coefficient of setting amplitude bound to preamplifier gain regulating circuit and digital gain adjusting circuit, when there is not the data point being greater than lower limit, gain upwards regulates, when existence is greater than the data point of the upper limit, gain regulates downwards.
5. the automatic gain control system of echo signal according to claim 4, is characterized in that, described gain adjustment module when carrying out gain-adjusted to data point, the speed that its gain adjuster step changes according to data point amplitude and changing.
6. an automatic gain regulating method for echo signal, is characterized in that, the method comprises the following steps:
1) echo signal is converted into voltage signal, first time is carried out to the AC portion turned in rear voltage signal and amplifies and export;
2) signal amplifying output to first carries out second time and amplifies process;
3) echo signal after second time being amplified process is carried out sampling and is formed target data;
4) calculate gain coefficient to control according to the crest meter of target data the gain that first time amplifies and second time is amplified, echo signal is controlled in certain limit in amplitude, thus reaches the object of automatic growth control.
7. the automatic gain regulating method of echo signal according to claim 6, it is characterized in that, described step 1) be realized by preamplifier gain regulating circuit, this preamplifier gain regulating circuit comprises field effect transistor and the first amplifier, described fet gate G is connected with the output of gain adjustment module, field effect transistor source S is connected to the output of the first amplifier by resistance R8, field effect transistor drain D is connected to the reverse input end of the first amplifier, connected by resistance R6 between described field effect transistor source S and drain D, the reverse input end of described first amplifier is used for being connected with echo signal.
8. the automatic gain regulating method of echo signal according to claim 7, it is characterized in that, described step 2) be utilize digital gain adjusting circuit realiration, this digital gain adjusting circuit comprises the second amplifier and digital regulation resistance, the regulation output end of described digital regulation resistance is connected to the reverse input end of the second amplifier, the A end of described digital regulation resistance is connected with the output of the second amplifier, connected by electric capacity between the regulation output end of described digital regulation resistance and A end, the SPI interface of described digital regulation resistance is connected with the output of gain adjustment module, the reverse input end of described second amplifier is connected with the output of the first amplifier.
9. the automatic gain regulating method of echo signal according to claim 8, it is characterized in that, described step 4) regulated by the gain coefficient of setting amplitude bound to preamplifier gain regulating circuit and digital gain adjusting circuit, when there is not the data point being greater than lower limit, gain upwards regulates, when existence is greater than the data point of the upper limit, gain regulates downwards.
10. the automatic gain regulating method of echo signal according to claim 9, is characterized in that, described step 4) when carrying out gain-adjusted to data point, the speed that its gain adjuster step changes according to data point amplitude and changing.
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| CN106160686A (en) * | 2015-03-31 | 2016-11-23 | 上海华虹集成电路有限责任公司 | Operational amplifier grain control circuit |
| CN111965413A (en) * | 2020-09-03 | 2020-11-20 | 南方电网数字电网研究院有限公司 | Current measuring method |
| CN112187203A (en) * | 2020-09-14 | 2021-01-05 | 北京航空航天大学 | Automatic gain control circuit and gain adjusting method thereof |
| CN112585491A (en) * | 2019-09-05 | 2021-03-30 | 深圳市速腾聚创科技有限公司 | Laser radar signal receiving circuit, laser radar signal gain control method and laser radar |
| CN112902991A (en) * | 2021-01-25 | 2021-06-04 | 上海兰宝传感科技股份有限公司 | Electromagnetic coding measurement method with automatic gain adjustment function |
| CN113029523A (en) * | 2021-03-02 | 2021-06-25 | 中山大学 | Gain automatic control device and method of I/Q demodulation phase meter in laser interferometer |
| CN113625891A (en) * | 2021-08-05 | 2021-11-09 | 深圳市千分一智能技术有限公司 | Signal self-adaptive amplifying circuit and active capacitance pen |
| CN115790566A (en) * | 2023-01-31 | 2023-03-14 | 中国船舶集团有限公司第七〇七研究所 | Adjusting method for preventing closed loop failure of fiber-optic gyroscope and fiber-optic gyroscope |
| CN117176097A (en) * | 2023-08-31 | 2023-12-05 | 苏州赫米兹健康科技有限公司 | Automatic gain control method for heart sound digital sampling system and heart sound digital sampling system |
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| CN112585491A (en) * | 2019-09-05 | 2021-03-30 | 深圳市速腾聚创科技有限公司 | Laser radar signal receiving circuit, laser radar signal gain control method and laser radar |
| CN111965413A (en) * | 2020-09-03 | 2020-11-20 | 南方电网数字电网研究院有限公司 | Current measuring method |
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| CN112187203B (en) * | 2020-09-14 | 2022-06-21 | 北京航空航天大学 | Automatic gain control circuit and gain adjusting method thereof |
| CN112187203A (en) * | 2020-09-14 | 2021-01-05 | 北京航空航天大学 | Automatic gain control circuit and gain adjusting method thereof |
| CN112902991A (en) * | 2021-01-25 | 2021-06-04 | 上海兰宝传感科技股份有限公司 | Electromagnetic coding measurement method with automatic gain adjustment function |
| CN113029523A (en) * | 2021-03-02 | 2021-06-25 | 中山大学 | Gain automatic control device and method of I/Q demodulation phase meter in laser interferometer |
| CN113625891A (en) * | 2021-08-05 | 2021-11-09 | 深圳市千分一智能技术有限公司 | Signal self-adaptive amplifying circuit and active capacitance pen |
| CN115790566A (en) * | 2023-01-31 | 2023-03-14 | 中国船舶集团有限公司第七〇七研究所 | Adjusting method for preventing closed loop failure of fiber-optic gyroscope and fiber-optic gyroscope |
| CN117176097A (en) * | 2023-08-31 | 2023-12-05 | 苏州赫米兹健康科技有限公司 | Automatic gain control method for heart sound digital sampling system and heart sound digital sampling system |
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Application publication date: 20150304 |
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