CN115166651A - Monopulse radar automatic gain control method, device, equipment and medium - Google Patents
Monopulse radar automatic gain control method, device, equipment and medium Download PDFInfo
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- CN115166651A CN115166651A CN202210836427.XA CN202210836427A CN115166651A CN 115166651 A CN115166651 A CN 115166651A CN 202210836427 A CN202210836427 A CN 202210836427A CN 115166651 A CN115166651 A CN 115166651A
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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
- G01S7/285—Receivers
- G01S7/34—Gain of receiver varied automatically during pulse-recurrence period, e.g. anti-clutter gain control
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
- G01S13/44—Monopulse radar, i.e. simultaneous lobing
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Abstract
The invention relates to a monopulse radar automatic gain control method, a device, equipment and a medium, wherein the method comprises the following steps: acquiring target information of a target tracked by a radar in the current period; determining first gain control information matched with the target amplitude information according to the target period sequence number; determining third gain control information corresponding to the next period of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period; and sending the third gain control information to a receiver so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sending a period sequence number corresponding to the third gain control to a signal processing module. By the method, the target amplitude information of the current period does not need to be actually measured, the gain control can be accurately carried out, and the problem of hysteresis does not need to be distinguished at all.
Description
Technical Field
The invention relates to the technical field of radar gain control, in particular to a method, a device, equipment and a medium for automatic gain control of a monopulse radar.
Background
The amplitude of a signal received by a radar system is influenced by various factors, so that the amplitude of the signal fluctuates, and the receiver cannot normally demodulate the signal due to too small or too large signal, and finally the radar cannot normally track. Therefore, the radar must have the capability of gain control, so that the amplitude of the signal output by the receiver is stabilized at a target threshold. Generally, a threshold value of the signal amplitude is set in advance at the radar end, and after the radar tracks an upper target, the signal amplitude is expected to be kept at the threshold value all the time through automatic gain control so as to be beneficial to stable tracking. The radar receives the echo signal by the receiver, controls the demodulation signal according to the Gain Control information and outputs the demodulation signal to a subsequent signal processing module, the signal processing module outputs the target amplitude information obtained after processing to the main Control software of the radar, and the main Control software forms the Gain Control information of the receiver in the next period of the radar according to the target amplitude information and the Gain Control information of the amplitude information, so that Automatic Gain Control (AGC) of the radar is completed.
The principle of the gain control is that if the gain is increased by VdB, the amplitude of the output signal is decreased by VdB, and if the gain is decreased by VdB, the amplitude of the output signal is increased by VdB. Theoretically, the relationship between the automatic gain AGC and the signal amplitude is as follows:
AGC n+1 ＝AGC n +AmpdB n -StdAmpdB (1)
wherein the AGC n Is the gain of the nth period control receiver, ampdB n Is by AGC n Controlling the amplitude of the signal of the nth period measured by the radar after the gain of the receiver, stdAmpdB being a predetermined target threshold required for the amplitude of the signal, AGC n+1 It is the (n + 1) th cycle that controls the gain of the receiver.
It can be known from the formula (1) that when the measured external signal amplitude is stable at StdAmpdB, the automatic gain AGC is also a stable value, and when the measured external signal amplitude suddenly increases or decreases, the value of the automatic gain AGC can be changed rapidly by using the formula (1), so that the signal amplitude is maintained at StdAmpdB.
Because signals in an actual working environment are influenced by various factors, in order to make automatic gain control relatively stable, an algorithm of the radar automatic gain control generally adopts a first-order Alpha filter:
AGC n+1 ＝AGC n +α*(AmpdB n -StdAmpdB) (2)
where α is a predetermined filter coefficient (α ≦ 1).
If the radar can ensure the nth period, the main control software can obtain the amplitude information AmpdB which is sent by the signal processing module and is measured in the nth period n Then the main control software can obtain the gain AGC of the receiver which should be controlled in the (n + 1) th period according to the formula (2) n+1 And forming an AGC closed control loop.
However, because the monopulse radar only tracks one target and the repetition period is several milliseconds, and the signal processing module determines the amplitude of the target signal after gain control from the reception of the target signal after gain control to the completion of processing, and outputs the target signal to the main control software with a delay of i cycles, that is, the amplitude of the signal obtained by the main control software in the nth cycle is the amplitude of the signal in the nth-i cycle returned by the signal processing module, it is difficult to control the main control software according to the formula (2) when performing automatic gain control according to the amplitude of the signal obtained in the nth cycle.
Taking the case that the data returned by the signal processing module lags behind by 1 cycle, the current algorithm usually adopts the formula (3) or (4) to perform gain control, wherein the formula (3) and the formula (4) are respectively:
AGC n+1 ＝AGC n-1 +α*(AmpdB n-1 -StdAmpdB) (3)
AGC n+1 ＝AGC n +α*(AmpdB n-1 -StdAmpdB) (4)
as can be seen from equation (3), the gain control information AGC corresponding to the nth period n Gain control information AGC corresponding to the (n + 1) th period n+1 In fact, 2 AGC control loops are formed, and according to this method, if the amplitude of the signal returned by the signal processing module lags behind by i cycles, i +1 AGC control loops are formed. In practical application, the method is found to be used for gain controlThe signal amplitude obtained after control is closely related to the value of alpha, and the smaller the alpha is, the larger the deviation of the obtained signal amplitude from the target amplitude threshold StdAmpdB is.
Although the formula (4) is 1 AGC control loop, the control principle is not consistent with that of the formula (1), and in practical application, it is found that when the gain control is performed by using the method corresponding to the formula (4), the amplitude of the signal obtained after the control is also closely related to the value of α, and the closer α is to 1, the more difficult the signal is to be stabilized, that is, the mean square error is large, and even the situation that the signal cannot be stabilized occurs.
In summary, how to accurately perform gain control on amplitude information of a current period is an urgent problem to be solved in the prior art for acquiring signal amplitude with i cycles behind.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for controlling the automatic gain of a monopulse radar, and aims to solve at least one technical problem.
In a first aspect, the technical solution for solving the above technical problem of the present invention is as follows: a method of monopulse radar automatic gain control, the method comprising:
acquiring target information of a target tracked by a radar in a current period, wherein the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods before the current period;
determining first gain control information matched with the target amplitude information according to the target period sequence number;
determining third gain control information corresponding to the next period of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and sending the third gain control information to the receiver so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sending a period sequence number corresponding to the third gain control to the signal processing module.
The beneficial effects of the invention are: in the scheme of the application, considering that the target amplitude information of the current period is acquired after being delayed by i periods, first gain control information matched with the target amplitude information can be determined according to the sequence number of the target period, and then according to the first gain control information, the target amplitude information and the second gain control information of the current period, the third gain control information corresponding to the next period of the current period can be determined without actually measuring the target amplitude information of the current period, so that when the automatic gain of the radar is controlled by the scheme of the application, the gain control can be accurately performed, and the problem of whether delay exists is completely avoided.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the method also includes:
and receiving the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information sent by the signal processing module, and performing gain control on the target amplitude information of the next cycle according to the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information.
The method has the advantages that the target amplitude information after gain control can be used as the target amplitude information corresponding to the current period through the scheme, and the target amplitude information of the next period is subjected to gain control according to the scheme, namely the gain control of the target amplitude information corresponding to each period of the radar is realized. That is to say, in the solution of the present application, when the amplitude information of the current period cannot be obtained, the amplitude information of the current period may be determined by using the first gain control information, the target amplitude information matched with the first gain control information, and the second gain control information of the current period, so that gain control over the target amplitude information of the next period is implemented, that is, gain control over the target amplitude information corresponding to each period of the radar is implemented.
Further, the determining third gain control information corresponding to a next period of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period includes:
determining the amplitude information of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and the target amplitude threshold.
The method has the advantages that in the scheme of the application, the amplitude information of the current period is calculated according to the first gain control information, the target amplitude information and the second gain control information of the current period without actually measuring the amplitude information of the current period, so that the influence of a lagging condition on the accuracy of the amplitude information of the current period can be avoided, and the determined third gain control information is more accurate.
Further, the determining the amplitude information of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period includes:
determining the amplitude information of the current period through a first formula according to the first gain control information, the target amplitude information and the second gain control information of the current period, wherein the first formula is as follows:
TheoryAmpdB n ＝AmpdB n-i +AGC n-i -AGC n
wherein n represents the cycle number corresponding to the current cycle, n-i represents the cycle number corresponding to the target cycle, i represents the lag of i cycles, theoryAmpdB n Amplitude information representing the current period, ampdB n-i Representing target amplitude information, AGC n-i Representing first gain control information, AGC n Indicating second gain control information.
The method has the advantages that the first formula is obtained through a large number of experimental verifications, and the relationship among the first gain control information, the target amplitude information, the second gain control information of the current period and the amplitude information of the current period is more accurately represented through the first formula, so that the amplitude information of the current period obtained through calculation is more accurate.
Further, the determining third gain control information corresponding to a next period of the current period according to the amplitude information of the current period, the second gain control information, and the target amplitude threshold includes:
according to the amplitude information of the current period, the second gain control information and the target amplitude threshold value, determining third gain control information corresponding to the next period of the current period through a second formula, wherein the second formula is as follows:
AGC n+1 ＝AGC n +α*(AmpdB n -StdAmpdB)
wherein, AGC n+1 Representing third gain control information, AGC n Represents second gain control information, alpha is a filter coefficient, ampdB n Representing the amplitude information of the current cycle, stdAmpdB represents the target amplitude threshold.
The beneficial effect of adopting the above further scheme is that in the prior art, the determination of the third gain control information is closely related to the filter coefficient, and if the value of alpha is not appropriate, the signal is difficult to be stabilized at the target amplitude threshold value during automatic gain control. The method can realize the stable control of the radar target signal amplitude, and the filter coefficient alpha is only related to the signal amplitude reaching the target amplitude threshold value (the larger the alpha is, the faster the target amplitude threshold value is reached, and the smaller the alpha is, the slower the target amplitude threshold value is reached), so the problem that the signal amplitude deviates from the target amplitude threshold value due to different alpha values can be completely avoided.
In a second aspect, the present invention provides an apparatus for controlling automatic gain of monopulse radar, which comprises:
the target information acquisition module is used for acquiring target information of a target tracked by the radar in the current period, the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods in advance of the current period;
the first determining module is used for determining first gain control information matched with the target amplitude information according to the target period sequence number;
the second determining module is used for determining third gain control information corresponding to the next period of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and the control module is used for sending the third gain control information to the receiver so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sends a period sequence number corresponding to the third gain control to the signal processing module.
In a third aspect, the present invention provides an electronic device to solve the above technical problem, where the electronic device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method for automatic gain control of monopulse radar according to the present application when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the monopulse radar automatic gain control method of the present application.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below.
Fig. 1 is a schematic flowchart of an automatic gain control method for a monopulse radar according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of another method for automatic gain control of a monopulse radar according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an automatic gain control apparatus for a monopulse radar according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The following describes the technical solution of the present invention and how to solve the above technical problems in detail by using specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.
The embodiment of the invention provides a monopulse radar automatic gain control method, referring to fig. 1, the execution main body of the scheme can be main control software, and the method comprises the following steps:
step S110, acquiring target information of a target tracked by the radar in the current period, wherein the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods before the current period;
step S120, determining first gain control information matched with the target amplitude information according to the target period sequence number;
step S130, determining third gain control information corresponding to the next period of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
step S140, sending the third gain control information to the receiver, so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sending a period number corresponding to the third gain control to the signal processing module.
In the scheme of the application, considering that the target amplitude information of the current period is acquired by delaying i periods, the first gain control information matched with the target amplitude information can be determined according to the sequence number of the target period, and then the third gain control information corresponding to the next period of the current period can be determined according to the first gain control information, the target amplitude information and the second gain control information of the current period without actually measuring the target amplitude information of the current period, so that when the automatic gain of the radar is controlled by the scheme of the application, the problem of whether the delay exists is completely avoided.
In order to further enhance the understanding of the solution of the present application, the following embodiments are further described below, and the present embodiment provides a method for controlling an automatic gain of a monopulse radar, the method including the following steps:
step S110, acquiring target information of a target tracked by the radar in the current period, wherein the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods before the current period;
the target information refers to target information acquired in a current period, the target information is generated by the signal processing module in the target period, the main control software sends a target period serial number to the signal processing module, in the current period, the signal processing module returns the target information corresponding to the current period to the main control software, namely the target information after gain control is performed in the target period, and if the target information lags behind by i periods, the period serial number of the target information returned by the signal processing module is a period serial number-i (namely a target period serial number) corresponding to the current period.
The amplitude information is signal amplitude, the amplitude information of each period corresponds to a period serial number, and the period serial number is a serial number which is generated by the main control software of the radar when the main control software sends the gain control information of the next period to the receiver in each processing period and is increased progressively according to the period. For example: the serial number of the nth control cycle is n, the main control software sends the cycle serial number of the (n + 1) th control cycle to the signal processing module, for the condition of no lag, when the cycle is n +1, the signal processing module returns the target information corresponding to the cycle of the (n + 1) th control cycle to the main control software, and if the cycle lags by i cycles, the cycle serial number of the target information returned by the signal processing module is n +1-i (the target cycle serial number).
It should be noted that, the automatic gain control of the radar is started after the radar tracks the target, the radar is in a searching state before the tracking, the radar uses a manually set gain control value, also called as MGC, before the automatic gain control is not performed, the MGC may be any suitable value, before the automatic gain control is not performed, each period of the radar may control the manual gain control value MGC of the receiver, that is, the initial value of the automatic gain control information AGC is MGC, and the period number of the radar is continuously counted from the searching stage, so the actual number of the 1 st period from the start of the automatic gain control is not 1, and the target amplitude information AmpdB n-i The situation of no value can not occur, and the first gain control information AGC at the moment n-i And second gain control information AGC n The same, equal to MGC.
And step S120, determining first gain control information matched with the target amplitude information according to the target period serial number.
Wherein, because the target information returned by the signal processing module lags behind i cycles, when controlling the gain of the next cycle of the current cycle, the gain control value of the cycle matched with the target amplitude information needs to be used, that is, if the target amplitude information sent by the signal processing of the nth cycle is the AmpdB of the nth-i cycle n-i Obtaining the gain control value AGC of the n-i th cycle by matching n-i 。
If the signal processing lags behind i periods, the main control software should store AGC control information larger than i periods, and the AGC control information matched with the target period sequence number SerialNo can be obtained according to the target period sequence number SerialNo sent by the signal processing.
Step S130, determining third gain control information corresponding to a next period of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period.
Optionally, the determining, according to the first gain control information, the target amplitude information, and the second gain control information of the current period, third gain control information corresponding to a next period of the current period includes:
determining the amplitude information of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and the target amplitude threshold.
To maintain an AGC control loop, the third gain control information needs to be determined in the form of equation (2). However, based on equation (2), the amplitude information of the current period actually measured cannot be obtained by the main control software in the current period due to the lag in signal processing. In the solution of the present application, the amplitude information of the current period may be first calculated according to the first gain control information, the target amplitude information, and the second gain control information of the current period, and then the third gain control information may be determined according to the calculated amplitude information of the current period.
Optionally, the determining the amplitude information of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period includes:
determining the amplitude information of the current period through a first formula according to the first gain control information, the target amplitude information and the second gain control information of the current period, wherein the first formula is as follows:
TheoryAmpdB n ＝AmpdB n-i +AGC n-i -AGC n (5)
wherein n represents the cycle number corresponding to the current cycle, n-i represents the cycle number corresponding to the target cycle, i represents the lag of i cycles, theoryAmpdB n Amplitude information representing the current period, ampdB n-i Representing target amplitude information, AGC n-i Representing first gain control information, AGC n Indicating second gain control information.
Optionally, the determining, according to the amplitude information of the current period, the second gain control information, and the target amplitude threshold, third gain control information corresponding to a next period of the current period includes:
determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and a target amplitude threshold value through a second formula, wherein the second formula is as follows:
AGC n+1 ＝AGC n +α*(AmpdB n -StdAmpdB) (2)
wherein, AGC n+1 Representing third gain control information, AGC n Represents second gain control information, alpha is a filter coefficient, ampdB n Representing the amplitude information of the current cycle and StdAmpdB representing the target amplitude threshold.
Wherein the first formula is used for determining the amplitude information TheoryAmpdB of the current period n TheoryAmpdB in the first formula n I.e. AmpdB in the second formula n 。
Substituting the first formula into the second formula may result in the following third formula:
AGC n+1 ＝AGC n +α*(AmpdB n-i +AGC n-i -AGC n -StdAmpdB) (6)
thus, in the nth period, the AGC used in the nth period (current period) can be obtained by a prediction calculation method n Amplitude information AmpdB obtained when controlling gain n Wherein, ampdB n ＝AmpdB n-i +AGC n-i -AGC n Thus, the third gain control information of the (n + 1) th cycle (the next cycle of the current cycle) can be calculated. It can be seen that the third formula is identical to the second formula if there is no hysteresis, i = 0. Therefore, when the automatic gain of the radar is controlled according to this method, it is not necessary to distinguish whether or not there is a problem of hysteresis.
Step S140, sending the third gain control information to the receiver, so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sending a period number corresponding to the third gain control to the signal processing module.
Referring to the gain control flow shown in fig. 2, the main control software sends the calculated third gain control information AGC to the receiver, and the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, that is, an echo signal, where the nth period of the receiver only receives the gain control information of the next period (the (n + 1) th period) controlled by the main control software, and does not need a period number, and the echo signal of the receiver in the (n + 1) th period is received by the radar from the outside, and this process does not lag behind.
In the (n + 1) th period, the receiver sends the target signal after gain control to the signal processing module, and the process is not lagged. The n-th period of the main control software sends the period serial number SerialNo (n + 1) matched with the target signal after gain control to the signal processing module, at this time, the n + 1-th period signal processing module knows that the target signal sent by the receiver latest corresponds to the period serial number SerialNo (n + 1) sent by the main control software, the signal processing module finishes processing the target signal, the process of obtaining new target amplitude information is delayed, and the signal processing module knows which period serial number corresponds to the target amplitude information which is output to the main control software after processing, therefore, the signal processing module sends the processed target amplitude information and the period serial number corresponding to the target amplitude information to the main control software together. The above steps S110 to S140 describe a process of primary gain control, and after obtaining the target signal after gain control, the method further includes:
the main control software receives the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information sent by the signal processing module, and performs gain control on the target amplitude information of the next cycle according to the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information.
After the receiver obtains the target signal after gain control, the receiver may send the target signal after gain control to the signal processing module, the signal processing module sends the processed target amplitude information and the cycle number matched with the processed target amplitude information to the main control software as new target information, and the above steps S110 to S140 are repeated so as to realize the automatic gain control of the monopulse radar.
To further illustrate the method for automatic gain control of monopulse radar according to the present invention, the following will further illustrate the method with an example:
since the quantization precision of the gain control information AGC of the receiver of the radar is 1dB, the AGC values obtained by the main control software are rounded. The data given below are the effects of performing automatic gain control using 3 methods mentioned herein, respectively, in the case where the signal processing lags 1 cycle. Each row in each table appearing hereinafter represents one period, and for example, data in the nth row represents amplitude information obtained by control of gain control information whose amplitude information is the nth-i period (i is a lag period, where i = 1), and AGC is gain control information of the (n + 1) th period.
The first method comprises the following steps: with equation (3), the target amplitude threshold is 70dB, α is 0.2, and the agc initial value is 0. Based on the data in Table 1, it can be seen that there are 2 loop data for AGC control, and after about 25 cycles, the amplitude information is stabilized at about 71.6dB, minus the AGC accuracy deviation [ -0.5,0.5], and the actual deviation is about 1.1dB 70 dB.
TABLE 1
The second method comprises the following steps: with equation (6), i.e., the third equation, the target amplitude threshold is 70dB, α is 0.2, and the agc initial value is 0. From the data in Table 2, it can be seen that over about 25 cycles, the amplitude information stabilizes at about 69.8dB, minus the AGC accuracy deviation (-0.5, 0.5), which is about 70dB away by about 0dB.
TABLE 2
With equation (6), the target amplitude threshold is 70dB, α is 0.8, and the agc initial value is 0. It can be seen from the data in table 3 that over about 7 cycles, the amplitude information stabilizes at about 69.8dB, minus the AGC accuracy deviation (-0.5, 0.5), which is about 70dB off by about 0dB.
TABLE 3
The third method comprises the following steps: with equation (4), the target amplitude threshold is 70dB, α is 0.8, and the agc initial value is 0. It can be seen from the data in table 4 that the amplitude information stabilizes around 70dB over approximately 33 cycles. In the first 30 periods, the signal fluctuation is very large, and after relative stability, the signal fluctuation is also larger than that of the formula (6).
TABLE 4
Therefore, the method corresponding to the formula (6) and the automatic gain control method for the monopulse radar solve the problems that a plurality of AGC control loops are caused by a traditional control method under the condition that the monopulse radar signal processing has hysteresis, the control effect is closely related to the filter coefficient alpha, and if the alpha value is not proper, the signal is difficult to be stabilized at the target amplitude threshold value during automatic gain control. The method can realize the stable control of the radar target signal amplitude, and the filter coefficient alpha is only related to the signal amplitude reaching the target amplitude threshold value (the larger the alpha is, the faster the target amplitude threshold value is reached, and the smaller the alpha is, the slower the target amplitude threshold value is reached), so the problem that the signal amplitude deviates from the target amplitude threshold value due to different alpha values can be completely avoided. Moreover, the method is a general method, and when the automatic gain of the radar is controlled, the problem of whether the delay exists is not distinguished at all.
Based on the same principle as the method shown in fig. 1, an embodiment of the present invention further provides a monopulse radar automatic gain control apparatus 20, as shown in fig. 3, the monopulse radar automatic gain control apparatus 20 may include a target information obtaining module 210, a first determining module 220, a second determining module 230, and a control module 240, where:
the target information obtaining module 210 is configured to obtain target information of a target tracked by the radar in a current period, where the target information includes target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used to represent a target period for generating the target amplitude information, and the target information of each period is obtained after i periods before the current period;
a first determining module 220, configured to determine, according to the target cycle number, first gain control information matched with the target amplitude information;
a second determining module 230, configured to determine, according to the first gain control information, the target amplitude information, and the second gain control information of the current period, third gain control information corresponding to a next period of the current period;
the control module 240 is configured to send the third gain control information to the receiver, so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sends a period number corresponding to the third gain control to the signal processing module.
Optionally, the apparatus further comprises:
and the period control module is used for receiving the target amplitude information after the gain control and the period serial number corresponding to the target amplitude information sent by the signal processing module, and performing gain control on the target amplitude information of the next period according to the target amplitude information after the gain control and the period serial number corresponding to the target amplitude information.
Optionally, when determining the third gain control information corresponding to the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period, the second determining module 230 is specifically configured to:
determining the amplitude information of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and the target amplitude threshold.
Optionally, when determining the amplitude information of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period, the second determining module 230 is specifically configured to:
determining the amplitude information of the current period through a first formula according to the first gain control information, the target amplitude information and the second gain control information of the current period, wherein the first formula is as follows:
TheoryAmpdB n ＝AmpdB n-i +AGC n-i -AGC n
wherein n represents the cycle number corresponding to the current cycle, n-i represents the cycle number corresponding to the target cycle, i represents the lag of i cycles, theoryAmpdB n Amplitude information representing the current period, ampdB n-i Representing target amplitude information, AGC n-i Representing first gain control information, AGC n Representing second gain control information.
Optionally, when determining the third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information, and the target amplitude threshold, the second determining module 230 is specifically configured to:
determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and a target amplitude threshold value through a second formula, wherein the second formula is as follows:
AGC n+1 ＝AGC n +α*(AmpdB n -StdAmpdB)
wherein, AGC n+1 Representing third gain control information, AGC n Represents second gain control information, alpha is a filter coefficient, ampdB n Representing the amplitude information of the current cycle, stdAmpdB represents the target amplitude threshold.
The monopulse radar automatic gain control device of the embodiment of the present invention may execute the monopulse radar automatic gain control method provided in the embodiment of the present invention, and the implementation principle is similar, the actions executed by each module and unit in the monopulse radar automatic gain control device in each embodiment of the present invention correspond to the steps in the monopulse radar automatic gain control method in each embodiment of the present invention, and the detailed functional description of each module of the monopulse radar automatic gain control device may be referred to the description in the corresponding monopulse radar automatic gain control method shown in the foregoing, and will not be described again here.
The above-mentioned monopulse radar automatic gain control device may be a computer program (including program code) running in a computer device, for example, the monopulse radar automatic gain control device is an application software; the apparatus may be configured to perform corresponding steps in the methods provided by the embodiments of the present invention.
In some embodiments, the monopulse radar automatic gain control apparatus provided by the embodiments of the present invention may be implemented by combining hardware and software, and as an example, the monopulse radar automatic gain control apparatus provided by the embodiments of the present invention may be a processor in the form of a hardware decoding processor, which is programmed to perform the monopulse radar automatic gain control method provided by the embodiments of the present invention, for example, the processor in the form of the hardware decoding processor may use one or more Application Specific Integrated Circuits (ASICs), DSPs, programmable Logic Devices (PLDs), complex Programmable Logic Devices (CPLDs), field Programmable Gate arrays (FPGAs-Field Programmable Gate arrays), or other electronic components.
In other embodiments, the monopulse radar automatic gain control apparatus provided by the embodiments of the present invention may be implemented in a software manner, and fig. 3 illustrates the monopulse radar automatic gain control apparatus stored in a memory, which may be software in the form of a program, a plug-in, and the like, and includes a series of modules, including a target information obtaining module 210, a first determining module 220, a second determining module 230, and a control module 240, for implementing the monopulse radar automatic gain control method provided by the embodiments of the present invention.
The modules described in the embodiments of the present invention may be implemented by software or hardware. Wherein the name of a module in some cases does not constitute a limitation on the module itself.
Based on the same principle as the method shown in the embodiment of the present invention, an embodiment of the present invention also provides an electronic device, which may include but is not limited to: a processor and a memory; a memory for storing a computer program; a processor for executing the method according to any of the embodiments of the present invention by calling a computer program.
In an alternative embodiment, an electronic device is provided, as shown in fig. 4, the electronic device 4000 shown in fig. 4 comprising: a processor 4001 and a memory 4003. Processor 4001 is coupled to memory 4003, such as via bus 4002. Optionally, the electronic device 4000 may further include a transceiver 4004, and the transceiver 4004 may be used for data interaction between the electronic device and other electronic devices, such as transmission of data and/or reception of data. In addition, the transceiver 4004 is not limited to one in practical applications, and the structure of the electronic device 4000 is not limited to the embodiment of the present invention.
The Processor 4001 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other Programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 4001 may also be a combination that performs a computing function, e.g., comprising one or more microprocessors, a combination of DSPs and microprocessors, etc.
The Memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these.
The memory 4003 is used for storing application program codes (computer programs) for executing the aspects of the present invention, and the execution is controlled by the processor 4001. Processor 4001 is configured to execute application code stored in memory 4003 to implement what is shown in the foregoing method embodiments.
The electronic device may also be a terminal device, and the electronic device shown in fig. 4 is only an example, and should not bring any limitation to the functions and the application scope of the embodiment of the present invention.
Embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, which, when running on a computer, enables the computer to execute the corresponding content in the foregoing method embodiments.
According to another aspect of the invention, there is also provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method provided in the implementation modes of the various embodiments.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
It should be understood that the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Embodiments of the present invention provide a computer readable storage medium that may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer-readable storage medium carries one or more programs which, when executed by the electronic device, cause the electronic device to perform the methods shown in the above embodiments.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other embodiments in which any combination of the features described above or their equivalents is encompassed without departing from the spirit of the disclosure. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (8)
1. A monopulse radar automatic gain control method is characterized by comprising the following steps:
acquiring target information of a target tracked by a radar in a current period, wherein the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods before the current period;
determining first gain control information matched with the target amplitude information according to the target period sequence number;
determining third gain control information corresponding to the next period of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and sending the third gain control information to a receiver so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sending a period sequence number corresponding to the third gain control to a signal processing module.
2. The method of claim 1, further comprising:
and receiving the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information sent by the signal processing module, and performing gain control on the target amplitude information of the next cycle according to the target amplitude information after gain control and the cycle serial number corresponding to the target amplitude information.
3. The method of claim 1, wherein determining third gain control information corresponding to a next period of a current period according to the first gain control information, the target amplitude information, and second gain control information of the current period comprises:
determining the amplitude information of the current period according to the first gain control information, the target amplitude information and the second gain control information of the current period;
and determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and a target amplitude threshold value.
4. The method of claim 3, wherein determining the amplitude information of the current period according to the first gain control information, the target amplitude information, and the second gain control information of the current period comprises:
determining the amplitude information of the current period through a first formula according to the first gain control information, the target amplitude information and the second gain control information of the current period, wherein the first formula is as follows:
TheoryAmpdB n ＝AmpdB n-i +AGC n-i -AGC n
wherein n represents the cycle number corresponding to the current cycle, n-i represents the cycle number corresponding to the target cycle, i represents the lag of i cycles, theoryAmpdB n Amplitude information, ampdB, representing the current period n-i Representing said target amplitude information, AGC n-i Representing said first gain control information, AGC n Representing said second gain controlAnd (4) information.
5. The method according to claim 4, wherein the determining, according to the amplitude information of the current cycle, the second gain control information and a target amplitude threshold, third gain control information corresponding to a next cycle of the current cycle comprises:
determining third gain control information corresponding to the next period of the current period according to the amplitude information of the current period, the second gain control information and a target amplitude threshold value by using a second formula, wherein the second formula is as follows:
AGC n+1 ＝AGC n +α*(AmpdB n -StdAmpdB)
wherein, AGC n+1 Representing said third gain control information, AGC n Represents the second gain control information, alpha is a filter coefficient, ampdB n Amplitude information representing the current period, stdAmpdB representing the target amplitude threshold.
6. A monopulse radar automatic gain control device, comprising:
the target information acquisition module is used for acquiring target information of a target tracked by the radar in the current period, wherein the target information comprises target amplitude information and a target period serial number corresponding to the target information, the target period serial number is used for representing a target period for generating the target amplitude information, and the target information of each period is acquired after i periods before the current period;
the first determining module is used for determining first gain control information matched with the target amplitude information according to the target period sequence number;
a second determining module, configured to determine, according to the first gain control information, the target amplitude information, and second gain control information of a current period, third gain control information corresponding to a next period of the current period;
and the control module is used for sending the third gain control information to a receiver so that the receiver performs gain control on the target amplitude information of the current period according to the third gain control information to obtain a target signal after gain control, and sends a period sequence number corresponding to the third gain control to the signal processing module.
7. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1-5 when executing the computer program.
8. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method of any one of claims 1-5.
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