CN105471466A - Digital automatic gain control method based on echo amplitude statistics - Google Patents
Digital automatic gain control method based on echo amplitude statistics Download PDFInfo
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- CN105471466A CN105471466A CN201510827562.8A CN201510827562A CN105471466A CN 105471466 A CN105471466 A CN 105471466A CN 201510827562 A CN201510827562 A CN 201510827562A CN 105471466 A CN105471466 A CN 105471466A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
Abstract
The invention provides a digital automatic gain control method based on echo amplitude statistics. Through an energy value of a receiving signal, an energy band is divided. According to a statistics method, frequencies of the signal falling into different energy scopes are calculated so that a signal energy interval is determined and the receiving signal is enlarged or reduced. Therefore, a purpose of controlling a gain smoothly and accurately is reached. The method based on statistics processing is applied to an automatic gain control process and an absolute gain is acquired. A relative gain which carries out a little change on an original signal is obtained. A signal amplitude can be smoothly and accurately adjusted to an ideal scope. By using the method in the invention, automatic adjustment to an echo receiver gain can be realized and an influence of signal fluctuation on receiving of the receiver is prevented; the design adopts a full digital method and the method is suitable for a circuit in which various systems of radars carry out accurate control on an intermediate frequency receiving signal gain.
Description
Technical field
The present invention relates to a kind of digital auto gain control method based on echo amplitude statistic.
Background technology
AGC (automatic gain control) system is all widely used in broadcast, communication, navigation and field of radar, its Main Function makes the output level of receiver keep substantially constant by Gain tuning, thus the signal fluctuation reducing to be caused by factors such as channel fadings is on the impact of receiver.Actual working environment is very complicated, and it is larger that propagation attenuation, electromagnetic interference etc. can cause receiver incoming signal level to convert.Namely automatic growth control is when receiving weak signal, improve receiver gain, then reduce receiver gain when receiving strong signal, remain on suitable level to make output signal, avoid because input signal is too little and cannot normally work, or making receiver generation saturation jamming because input signal is too large.
Current in automatic growth control patent more, as " method of quickly adjusting automatic gain control value and module thereof ", application number is CN200710147354.9, provide a kind of method and module thereof of the quickly adjusting automatic gain control value for wireless communication receiver, according to the method, the rapid adjustment to automatic gain control value can be realized, improve regulating the speed of automatic gain, reduce regulation time; " auto gain control method under a kind of time division multiplexing and device ", application number is CN201510150225.X, and the mode adopting simulation automatic growth control agc circuit and digital resources obtainment agc circuit to combine realizes the automatic control of gain.It is as follows that Corpus--based Method amount carries out automatic growth control aspect Patents, " a kind of acoustic environment recognition methods based on background noise minimum statistics measure feature ", application number is CN201310507384.1, propose the extraction of noise minimum statistics, modeling and recognition methods, be mainly used in voice recognition field; " SAR image change detection based on second-order statistic perturbation analysis ", application number CN201510230170.3, this invention effectively reduce due to time become the false-alarm that causes of coherent speckle noise, realize the detection to Different periods Same Scene region of variation; " a kind of high spectrum image object detection method based on high-order statistic ", application number CN201010128272.1, utilize high-order statistic model and signal processing method to obtain for unknown nuclear component many kinds of parameters, possess certain noise removal capability, higher change in concentration sensitiveness and geometric properties is identified.In addition, the document such as " digital AGC and relation technological researching ", " research of antijam receiver automatic gain control ", to the improvement of automatic gain control circuit thus optimized gain control, realize gain fast and control.
Summary of the invention
The object of the invention is to avoid the weak point in above-mentioned background technology and a kind of auto gain control method based on echo amplitude statistic proposed.It is from the energy value of Received signal strength, divides energy band, falls into the number of times of different-energy scope according to this signal of method statistic of statistic, thus determines that this signal energy is interval, to expand or to reduce Received signal strength, reaches the object of exactly ride gain.
In order to achieve the above object, technical scheme of the present invention is to provide a kind of digital auto gain control method based on echo amplitude statistic, and it is as follows that it comprises step:
S1. gather radar echo signal, to pretreated echo-signal delivery value, calculate signal energy spectrum;
S2. divide energy area, energy spectrum is mapped to each energy area, obtain energy area spectrum;
S3. according to energy area spectrum, statistics falls into the data amount check of each energy area spectrum, obtains each Interval Statistic;
S4. the statistic of each energy area and threshold denominators are compared, when statistic is greater than or equal to threshold denominators, comparative quantity is designated as 1, when statistic is less than threshold denominators, comparative quantity is designated as 0;
S5. inquire about from high-energy regions to low energy area, the non-vanishing energy area of first comparative quantity is labeled as the main energy of Received signal strength;
S6. the main energy of signal and energy threshold are compared, draw absolute gain size;
S7. absolute gain is judged whether in tolerance interval:
If at tolerance interval, signal is not adjusted;
If not at tolerance interval, calculate relative gain, signal is adjusted, complete gain control treatment to received signal.
The present invention relates to a kind of automatic calculated gains of method of carrying out amplitude statistics based on radar echo signal, realize the automatic adjustment to the gain of echo reception machine, prevent signal fluctuation from receiving receiver and impact.Design adopts digital method, and the radar being applicable to various system carries out the circuit accurately controlled to intermediate frequency gain of received signal.
The present invention's tool compared with background technology has the following advantages:
1. patent of the present invention is based on echo signal amplitude statistical theory, can add up target echo characteristic, avoid the phenomenon of the abrupt gain that Conventional automatic gain control method causes within a period of time, realizes the stable reception of receiver to echo-signal.
2. the present invention possesses in real time according to the function of pulse duration adjustment gain threshold, and meanwhile, when there is clutter interference, when namely this interference width does not mate with signal pulse width, AGC does not regulate and control thereupon, has stronger antijamming capability;
3. patent of the present invention possesses capability of fast response, and can be implemented in the repetition period regulation and control realized gain, compared with traditional analog control method, the response time is very fast.
4. the invention belongs to digital automatic growth control, high degree simplifies traditional analog AGC control circuit, and amplitude statistics, energy balane, all by software simulating, are convenient to adjustment in real time and are improved.
Accompanying drawing explanation
Fig. 1 is the flow chart of the automatic growth control process of Corpus--based Method amount.
Fig. 2 is for calculating signal energy theory diagram; Input signal real part I and imaginary part Q, the real part of signal and imaginary part difference square, results added, namely obtains signal energy.
Fig. 3 is the theory diagram calculating relative gain.
One group of signal produced immediately that Fig. 4 inputs when being algorithm simulating.
Fig. 5 emulates the absolute gain result drawn.
Fig. 6 emulates the relative gain result drawn.
Embodiment
The invention provides a kind of digital auto gain control method based on echo amplitude statistic, comprise step as follows:
S1. gather radar echo signal, to pretreated echo-signal delivery value, calculate signal energy spectrum; That is, obtain echo solid part signal and signal imaginary part by preliminary treatment, its squared results is added, obtains signal energy;
S2. divide energy area, energy spectrum is mapped to each energy area, obtain energy area spectrum;
S3. according to energy area spectrum, statistics falls into the data amount check of each energy area spectrum, obtains each Interval Statistic;
S4. the statistic of each energy area and threshold denominators are compared, when statistic is greater than or equal to threshold denominators, comparative quantity is designated as 1, when statistic is less than threshold denominators, comparative quantity is designated as 0;
S5. inquire about from high-energy regions to low energy area, the non-vanishing energy area of first comparative quantity is labeled as the main energy of Received signal strength;
S6. the main energy of signal and energy threshold are compared, draw absolute gain size;
S7. judge gain whether in tolerance interval, if at tolerance interval, just signal is not adjusted; If not at tolerance interval, then calculate relative gain, signal is adjusted, complete gain control treatment to received signal.
With reference to Fig. 1, Fig. 2 and Fig. 3, the present invention is based on automatic gaining controling signal process thought, wherein traditional auto gain control method is replaced with the automatic growth control of Corpus--based Method amount, achieve and judge the main energy band of Received signal strength and it is steadily exported a kind of automatic growth control processing method controlled.
As shown in Figure 1, gather radar echo signal, and carry out the preliminary treatment such as Digital Down Convert, obtain echo solid part signal I and signal imaginary part Q.According to Fig. 2, by the real part I of signal and imaginary part Q difference square, squared results is added, and obtains signal energy.
Energy binned is become the region that M discrete, travel through backward energy value from 1 to N, N counts, if the n-th (wherein n=1 for gathering radar echo signal ... N) energy value of individual echo data is at interval m(wherein m=1 ... M), in, so between energy range, the statistic of m adds 1.
By the statistic in m different-energy interval with compare with threshold denominators respectively, when statistic is greater than or equal to gain threshold, statistic is designated as 1 again, when statistic is less than gain threshold, statistic is designated as 0.
Travel through whole ability successively from 0 to m interval, the data capacity that the statistic between first energy range equals 1 is designated as the main energy of Received signal strength.
The main energy of signal and the energy threshold standard independently set are done difference, draws absolute gain size.
Absolute gain and gain threshold are made comparisons, judges absolute gain whether in gain threshold.If in gain threshold, signal is not adjusted; If be greater than the maximum of gain ranging, relative gain is 1, if be less than the minimum value of gain ranging, relative gain is-1.Complete the automatic gain control process of Corpus--based Method amount.
One group of signal produced immediately that Fig. 4 inputs when being algorithm simulating.Fig. 5 emulates the absolute gain result drawn.Fig. 6 emulates the relative gain result drawn.
The method of Corpus--based Method amount process is applied in automatic gain control process by the present invention, obtains absolute gain, then has relative gain to obtain changing less relative gain to original signal, can exactly signal amplitude is adjusted to ideal range.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (6)
1. based on a digital auto gain control method for echo amplitude statistic, it is characterized in that, comprise step as follows:
S1. gather radar echo signal, to pretreated echo-signal delivery value, calculate signal energy spectrum;
S2. divide energy area, energy spectrum is mapped to each energy area, obtain energy area spectrum;
S3. according to energy area spectrum, statistics falls into the data amount check of each energy area spectrum, obtains each Interval Statistic;
S4. the statistic of each energy area and threshold denominators are compared, when statistic is greater than or equal to threshold denominators, comparative quantity is designated as 1, when statistic is less than threshold denominators, comparative quantity is designated as 0;
S5. inquire about from high-energy regions to low energy area, the non-vanishing energy area of first comparative quantity is labeled as the main energy of Received signal strength;
S6. the main energy of signal and energy threshold are compared, draw absolute gain size;
S7. absolute gain is judged whether in tolerance interval:
If at tolerance interval, signal is not adjusted;
If not at tolerance interval, calculate relative gain, signal is adjusted, complete gain control treatment to received signal.
2. a kind of digital auto gain control method based on echo amplitude statistic as claimed in claim 1, is characterized in that:
In S1, gather radar echo signal and carry out the preliminary treatment comprising Digital Down Convert, by the echo solid part signal I that obtains and signal imaginary part Q respectively square, squared results addition, obtains signal energy.
3. a kind of digital auto gain control method based on echo amplitude statistic as claimed in claim 2, is characterized in that:
In S2 to S3, signal energy is divided into the individual discrete region of M, travels through backward energy value from 1 to N, N counts for gathering radar echo signal;
If the energy value of the n-th echo data is in interval m, then between energy range, the statistic of m adds 1;
Wherein, n=1 ... N, m=1 ... M.
4. a kind of digital auto gain control method based on echo amplitude statistic as claimed in claim 3, is characterized in that:
In S4, by the statistic in m different-energy interval with compare with threshold denominators respectively:
When statistic is greater than or equal to gain threshold, statistic is designated as 1 again;
When statistic is less than gain threshold, statistic is designated as 0.
5. a kind of digital auto gain control method based on echo amplitude statistic as claimed in claim 4, is characterized in that:
In S5, travel through between whole energy range successively from 0 to m, the data capacity that the statistic between first energy range equals 1 is designated as the main energy of Received signal strength.
6. a kind of digital auto gain control method based on echo amplitude statistic as claimed in claim 5, is characterized in that:
In S6 to S7, the main energy of signal and the energy threshold standard independently set are done difference, draws absolute gain size; Absolute gain and gain threshold are made comparisons, judge absolute gain whether in gain threshold:
If absolute gain is in gain threshold, signal is not adjusted;
If absolute gain is greater than the maximum of gain ranging, relative gain is 1,
If absolute gain is less than the minimum value of gain ranging, relative gain is-1, completes the automatic gain control process of Corpus--based Method amount.
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Cited By (3)
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| CN106788509A (en) * | 2016-12-15 | 2017-05-31 | 中国电子科技集团公司第二十研究所 | Microwave approach receiver captures single frames scanning signal auto gain control method |
| CN112585494A (en) * | 2019-09-26 | 2021-03-30 | 深圳市速腾聚创科技有限公司 | Laser radar signal processing method and device, computer equipment and storage medium |
| 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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| CN114415124B (en) * | 2022-03-29 | 2022-07-08 | 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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