CN117420756A - Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic - Google Patents
Airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic Download PDFInfo
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Abstract
The invention discloses an airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic, and belongs to the technical field of radar digital signal processing. The invention comprises an instruction control module, an analysis module, a microwave control module, a self-adaptive attenuation module and an output module; the instruction control module transmits a message instruction to the airborne radar by the upper computer and carries out safety detection on message transmission; the analysis module receives and analyzes the message, extracts the required information and transmits the required information to the microwave control module; the microwave control module controls the radar to finish signal reconnaissance according to the analysis data; the self-adaptive attenuation module carries out dynamic attenuation adjustment on the reconnaissance signal; the output module outputs frequency point and array surface data detected by the radar and an adaptive attenuation value; the invention realizes the flexible conversion of the control radar in the multi-mode reconnaissance state through the multi-module function, and ensures the reliability and the practicability of the signal while expanding the signal detection range.
Description
Technical Field
The invention relates to the technical field of radar digital signal processing, in particular to an airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic.
Background
For the existing common civil airborne radar system equipment, single-array-surface reconnaissance operation can be carried out in design, and the design cannot meet the requirement of multi-azimuth reconnaissance in an actual complex airspace environment, so that the reconnaissance effect can be greatly reduced.
The civil radar of the airborne reconnaissance system based on single-array-surface sweep frequency, which is commonly used in the past, comprises the following principles: in the same square point, the sweep control in a single 90-degree array plane is carried out, so that the operation has a remarkable problem that if sweep control is needed for the rest of the array planes of the square point, the sweep control can be realized by turning the direction of a machine body, the operation takes longer in practical application, the requirements on the condition of an external carrier are higher, the use is more frequent, and the defects are urgently needed to be solved for the common airborne reconnaissance scene of the equipment. In addition, for airborne radar reconnaissance equipment, once the equipment is carried on unmanned aerial vehicle and takes off the back of work, generally be difficult to set up input parameter once more, if do not have the design of automatic decay, the signal that can appear detecting in the actual reconnaissance work probably can not be with the fixed attenuation value looks adaptation of input before taking off, can lead to in the actual measurement signal that receives too big exceeding threshold value or undersize can't be gathered like this for actual reconnaissance result does not have practicality and credibility.
Disclosure of Invention
The invention aims to provide an airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic so as to solve the problems in the background art.
In order to solve the technical problems, the invention provides the following technical scheme:
the airborne radar reconnaissance digital system based on the sweep frequency control and automatic attenuation logic comprises an airborne radar detector and a rear-end control center, wherein the rear-end control center comprises an instruction control module, an analysis module, a microwave control module, a self-adaptive attenuation module and an output module;
the instruction control module transmits a message instruction to the airborne radar by the upper computer; the analysis module analyzes the instruction message, extracts the required information and transmits the information to the microwave control module; the microwave control module utilizes the initial data to complete array surface switching and sweep frequency control of the airborne radar in operation; the self-adaptive attenuation module dynamically adjusts signals received by the airborne radar in the reconnaissance process; the output module outputs the adjusted correct signal;
the instruction control module is connected with the analysis module; the analysis module is connected with the microwave control module; the microwave control module is connected with the self-adaptive attenuation module; the self-adaptive attenuation module is connected with the output module.
The civil radar industry is a technology-intensive and innovative driving industry, and has the characteristics of high added value, high benefit and high social benefit; the current civil radar products relate to the fields of electronic technology, computer technology, signal processing technology and the like, and in the application, the civil radar is taken as a basis to further analyze the sweep frequency and attenuation of the whole radar.
The instruction control module comprises an instruction generation unit and an instruction transmission unit; the instruction generating unit sets radar initial data by an upper computer and generates the data into an instruction message; the instruction transmission unit sends the generated instruction message to the operation radar through the spi.
The upper computer of the airborne radar is equipment for controlling and monitoring a radar system; the system is generally composed of a computer and corresponding software and algorithms, and is used for controlling the operation mode, parameter setting, data processing and display functions of the radar; the upper computer can receive the data acquired by the radar sensor, process and analyze the data in real time, and provide the analysis result with data and image information for operators through the user display end; the instruction transmission unit performs data transmission with the airborne radar in a wireless transmission mode.
The analysis module comprises a message analysis unit, an array plane and frequency point information extraction unit and an attenuation information extraction unit; the message analysis unit receives the instruction message, analyzes the message and acquires information data initially set by the upper computer for the radar; the array plane and frequency point information extraction unit is used for cooperating with external messagesThe fixed message content is provided with corresponding parameter value logic according to different message positions, and the required local oscillation frequency f is extracted from the corresponding positions of the input message o Fixed frequency f d Frequency band of sweep [ f ] start ,f end ]The sweep bandwidth B, the fixed array face angle theta and the sweep face angle interval [ theta ] start ,θ end ]Rate of scan plane theta sp Information, the message information extracted is input into the microwave control module; the attenuation information extraction unit is used for placing corresponding parameter value logic according to different message positions according to the message content interacted with the external message, and extracting parameters required by controlling the automatic attenuation function from the corresponding positions of the input message, wherein the parameters comprise an original attenuation value a 0 Original amplitude value A 0 Attenuation adaptive variation delta a, maximum and minimum power limit interval j min ,j max ]And decay reset delay t 0 And inputting the extracted message information into an adaptive attenuation module.
The microwave control module comprises a first state machine, a second state machine and a pdw information receiving unit; the first state machine is used as radar reconnaissance state jump control equipment and is used for array plane switching and sweep frequency control during radar reconnaissance; the first state machine receives the message information transmitted by the analysis module, judges the frequency and the array surface type of the current radar input for the first time according to the message information, and sends the judging result to the second state machine as a control message; the second state machine receives the control message and controls the state content of the actual operation of the airborne radar according to the message content; the pdw information receiving unit is configured to receive pdw information reflected by a detection target.
Four reconnaissance states are respectively a fixed frequency array surface, a sweep frequency array surface and a sweep frequency array surface when the radar performs reconnaissance operation; if the detection state of the radar is a fixed-frequency fixed-array plane, the radar firstly sends an array plane information message to the microwave module, and then sends a frequency point information message; if the reconnaissance state of the radar is a sweep frequency array plane, the radar firstly transmits an array plane information message to the microwave module, then transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increment mode, and is regarded as a sweep frequency logic for completing one array plane, and then transmits second array plane information and circulating frequency point switching information according to the logic, so that the information is pushed until all the array plane and frequency point information is transmitted; if the reconnaissance state of the radar is the sweep frequency array surface, the radar firstly transmits an array surface information message to the microwave module, and then the radar transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increasing way; if the detection state of the radar is a fixed-frequency scanning plane, the radar firstly transmits a plane information message to the microwave module, then transmits a frequency point information message, then transmits a second plane information message, then transmits a frequency point information message, and the like, so that the transmission of the information messages and the frequency point information messages of all the planes is completed.
The "fixed" in the state refers to fixed singleness, and the "sweeping" refers to scanning switching according to the input control message information; the method comprises the steps that the array surface information is switched from a starting angle to a terminating angle according to steps, the frequency point information is switched from a starting frequency to a terminating frequency according to steps, and two types of information are sent in a circulating mode during the frequency sweeping or array surface sweeping mode; the array information and frequency point information switching logic is used for controlling according to the input control message information;
the control message information comprises sweep frequency step Deltaf and initial frequency f start Termination frequency f end Step delta theta of scanning array surface and initial array surface angle theta start And terminating the array face angle theta end The method comprises the steps of carrying out a first treatment on the surface of the Wherein the sweep frequency step refers to a fixed difference value of each switching frequency point, and the calculation formula is f end ＝f start +n.DELTA.f, where N is the number of switching frequency points, n.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial frequency refers to the switching frequency from this frequency point; the termination frequency means that one frequency scanning period is completed when the frequency point is scanned; the scan plane step refers to a fixed difference value of the angle of each switching plane, and the calculation formula is theta end ＝θ start +r.DELTA.θ, where r is the number of single-array planar array angular switches, r.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial array face angle refers to the switching of the array face from the angle; terminating the array face angle means that the single array face scanning is completed when the array face angle is scanned;
In addition, an array surface is arranged on the radar,Frequency point silence time counter and silence time t mo The method comprises the steps of carrying out a first treatment on the surface of the Setting a silence mark to be 1 in the silence time; when the radar is in the array plane and frequency point switching, the information sending and receiving of the radar is in a silence state, and the radar does not send pdw information and outputs a silence mark in silence time.
The self-adaptive attenuation module comprises an automatic reset unit, a storage unit, an amplitude value judging unit and an automatic attenuation unit;
the automatic reset unit acquires the distance s between the rear-end control center and the airborne detector and the rate refractive index of electromagnetic wave transmission in the current environment in real timeCalculating pdw maximum threshold t of waiting information receiving time of information receiving unit waitmax The calculation formula is ∈>If t wait ＞t waitmax Judging pdw information receiving overtime, transmitting a self-checking confirmation message to the airborne radar detector by the rear-end control center, and recording a confirmation time t after the message is transmitted con According to the formula->Calculating ideal information round trip transmission time->According to the formula->Calculating the round trip transmission time of the current actual information>If->Judging that the transmission channel between the rear-end control center and the airborne detector is normal and the radar position is correct, and thenThe radar detects that the target information is abnormal, so that pdw information is received overtime; if- >Or (b)Judging that a transmission channel between the rear-end control center and the airborne detector is normal, but the radar position is abnormal, so that pdw information is received overtime; if t con ＞t waitmax Judging that the transmission channel between the rear-end control center and the airborne detector is abnormal, and causing pdw information receiving overtime; wherein (1)>v is the transmission rate of electromagnetic waves in an ideal state, t wait The actual waiting time of the pdw information receiving unit is w is the sum of the frequency point switching times and the array surface switching times, the calculation formula is w=n+r, wherein the frequency point switching times and the array surface switching times in different radar detection states are overlapped, and w is required to be deleted at the moment; calculating the sum of message information transmission time between a rear-end control center and an onboard detector, time spent by the detector for detecting a frequency band and an array plane in the process of detecting a target object, and array plane and frequency point switching silence time between detection signals of the detector, and calculating the time of the whole radar detection signal, wherein the value is used as a maximum threshold value to limit the actual detection time, so that whether the current radar information reception is overtime or not can be known; if the detection target is overtime, carrying out abnormal determination on a transmission channel, a radar position and a detection target of the radar and a rear-end control center; the actual value and the ideal value of the transmission time between the radar and the rear-end control center are calculated to form an interval, and if the time is in the interval, the transmission channel is normal; if the radar position is smaller than the interval or larger than the interval but not larger than the overtime threshold, judging that the radar position is abnormal, and if the radar position is larger than the overtime threshold, judging that the target information is abnormal;
The storage unit is used for storing the original amplitude value A 0 The method comprises the steps of carrying out a first treatment on the surface of the The original amplitude value is an ideal amplitude value of the target to be detected;
the amplitude value judging unit compares the amplitude value of the received information with the stored amplitude value, and reserves the nearest value A of the adjacent amplitude information re The calculation formula is A re ＝Max(A＜A 0 ) Or A re ＝Min(A＞A 0 ) Wherein A is the amplitude value of the actual information; judging at this time A re The actual power j (A re ) Whether within the power maximum and minimum limit interval; the accuracy of the information can be ensured to the greatest extent by reserving the actual value of the amplitude value closest to the ideal target;
the automatic attenuation unit carries out attenuation operation according to the amplitude value judgment result; according to formula j (A at )＝j(A re )-a 0 Calculating the information power of the current information power after the conventional attenuation operation; if j (A) at )∈[j min ,j max ]Carrying out attenuation operation on the actual information power through a preset conventional attenuation value; if it isThe automatic attenuation switch is turned on, the original attenuation value is automatically adjusted by taking the attenuation self-adaptive variable quantity as a step, and the adjusted new original attenuation value is within the maximum and minimum power limit interval after the actual information power is attenuated;
when j (A) at )＞j max In the process, the calculation formula of the automatic attenuation is that
j com ＝Max{j(A re )-[a 0 +(n*Δa)]}∈[j min ,j max ]；
For j com Take j max Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if the calculated n value has decimal, the maximum positive integer is nearly taken for n, and j corresponding to the n value at the moment is calculated according to the adjusted n value com The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is com To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a maximum power value of (a); n is the number of adjustments of the original attenuation value, N ε N * The method comprises the steps of carrying out a first treatment on the surface of the At this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 ++ (n x Δa); the calculation result is continuously approximate to the power limiting interval through a formula, and the maximum value is taken as the actual value after attenuation which is required to meet the interval requirement;
when j (A) at )＜j min The automatic attenuation calculation formula is
j fin ＝Min{j(A re )-[a 0 -(n*Δa)]}∈[j min ,j max ]
For j fin Take j min Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if the calculated n value has decimal, the minimum positive integer is nearly taken for n, and j corresponding to the n value at the moment is calculated according to the n value just adjusted fin The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is fin To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a minimum power value of (1); at this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 - (n x Δa); and (3) continuously approaching the power limiting interval through the formula calculation result, and taking the minimum value, wherein the minimum value is the actual value after attenuation which is required to meet the interval requirement.
The self-adaptive attenuation module receives the attenuation message information transmitted by the analysis module, and takes the information as an original attenuation input value; the original attenuation input values include original attenuation values a 0 Original amplitude value A 0 Maximum and minimum power limit interval j min ,j max ]An adaptive variation Δa; the automatic attenuation switch is positioned in the automatic attenuation unit and is used for starting automatic attenuation operation on the value of the actual signal power value which is not in the maximum and minimum limiting interval.
The output module comprises an array plane and frequency point information output unit and an attenuation value output unit; the array plane and frequency point information output unit carries out delay adjustment on the array plane information and the frequency point information sent by the radar, and controls microwaves on the adjusted messages of the array plane and the sweep frequency information; the attenuation value output unit outputs according to the automatic attenuation result, and if the actual power value does not perform automatic attenuation operation, the original attenuation value is output; if the actual power is subjected to automatic attenuation operation, outputting the processed automatic attenuation value, and taking the attenuation value as a new original attenuation value.
Compared with the prior art, the invention has the following beneficial effects: according to the technical scheme, on one hand, multi-array-plane switching control and sweep frequency logic are combined, and array plane information is extracted and supplied to a PDW (power distribution direction) information and multi-array-plane corresponding point phase difference module for taking, so that flexible switching and precise control of the array plane information and the sweep frequency information are ensured; and on the other hand, an attenuation mechanism of the airborne radar reconnaissance system is optimized, an automatic attenuation module is designed, so that amplitude information can be stably received in actual airborne work engineering, a reasonable and matched automatic attenuation value is analyzed and given, and a mechanism for resetting intermediate parameters to zero automatically in a timeout mode is matched, so that the reconnaissance result obtained in the actual work of airborne equipment is ensured to have reliability and accuracy.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of multi-array-plane switching and sweep logic control of an airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of the present invention;
FIG. 2 is an automatic attenuation flow chart of the airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, the present invention provides the following technical solutions:
the airborne radar reconnaissance digital system based on the sweep frequency control and automatic attenuation logic comprises an airborne radar detector and a rear-end control center, wherein the rear-end control center comprises an instruction control module, an analysis module, a microwave control module, a self-adaptive attenuation module and an output module;
The instruction control module transmits a message instruction to the airborne radar by the upper computer; the analysis module analyzes the instruction message, extracts the required information and transmits the information to the microwave control module; the microwave control module utilizes the initial data to complete array surface switching and sweep frequency control of the airborne radar in operation; the self-adaptive attenuation module dynamically adjusts signals received by the airborne radar in the reconnaissance process; the output module outputs the adjusted correct signal;
the instruction control module is connected with the analysis module; the analysis module is connected with the microwave control module; the microwave control module is connected with the self-adaptive attenuation module; the self-adaptive attenuation module is connected with the output module.
The civil radar industry is a technology-intensive and innovative driving industry, and has the characteristics of high added value, high benefit and high social benefit; the current civil radar products relate to the fields of electronic technology, computer technology, signal processing technology and the like, and in the application, the civil radar is taken as a basis to further analyze the sweep frequency and attenuation of the whole radar.
The instruction control module comprises an instruction generation unit and an instruction transmission unit; the instruction generating unit sets radar initial data by an upper computer and generates the data into an instruction message; the instruction transmission unit sends the generated instruction message to the operation radar through the spi.
The upper computer of the airborne radar is equipment for controlling and monitoring a radar system; the system is generally composed of a computer and corresponding software and algorithms, and is used for controlling the operation mode, parameter setting, data processing and display functions of the radar; the upper computer can receive the data acquired by the radar sensor, process and analyze the data in real time, and provide the analysis result with data and image information for operators through the user display end; the instruction transmission unit performs data transmission with the airborne radar in a wireless transmission mode.
The analysis module comprises a message analysis unit, an array plane and frequency point information extraction unit and an attenuation information extraction unit; the message analysis unit receives the instruction message, analyzes the message and acquires information data initially set by the upper computer for the radar; the array plane and frequency point information extraction unit is used for placing corresponding parameter value logic according to different message positions according to the message content interacted with an external message, and extracting the required local oscillation frequency f from the corresponding position of the input message o Fixed frequency f d Frequency band of sweep [ f ] start ,f end ]The sweep bandwidth B, the fixed array face angle theta and the sweep face angle interval [ theta ] start ,θ end ]Rate of scan plane theta sp Information, the message information extracted is input into the microwave control module; the attenuation information extraction unit is used for placing corresponding parameter value logic according to different message positions according to the message content interacted with the external message, and extracting parameters required by controlling the automatic attenuation function from the corresponding positions of the input message, wherein the parameters comprise an original attenuation value a 0 Original amplitude value A 0 Attenuation adaptive variation delta a, maximum and minimum power limit interval j min ,j max ]And decay reset delay t 0 And inputting the extracted message information into an adaptive attenuation module.
The microwave control module comprises a first state machine, a second state machine and a pdw information receiving unit; the first state machine is used as radar reconnaissance state jump control equipment and is used for array plane switching and sweep frequency control during radar reconnaissance; the first state machine receives the message information transmitted by the analysis module, judges the frequency and the array surface type of the current radar input for the first time according to the message information, and sends the judging result to the second state machine as a control message; the second state machine receives the control message and controls the state content of the actual operation of the airborne radar according to the message content; the pdw information receiving unit is configured to receive pdw information reflected by a detection target.
Four reconnaissance states are respectively a fixed frequency array surface, a sweep frequency array surface and a sweep frequency array surface when the radar performs reconnaissance operation; if the detection state of the radar is a fixed-frequency fixed-array plane, the radar firstly sends an array plane information message to the microwave module, and then sends a frequency point information message; if the reconnaissance state of the radar is a sweep frequency array plane, the radar firstly transmits an array plane information message to the microwave module, then transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increment mode, and is regarded as a sweep frequency logic for completing one array plane, and then transmits second array plane information and circulating frequency point switching information according to the logic, so that the information is pushed until all the array plane and frequency point information is transmitted; if the reconnaissance state of the radar is the sweep frequency array surface, the radar firstly transmits an array surface information message to the microwave module, and then the radar transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increasing way; if the detection state of the radar is a fixed-frequency scanning plane, the radar firstly transmits a plane information message to the microwave module, then transmits a frequency point information message, then transmits a second plane information message, then transmits a frequency point information message, and the like, so that the transmission of the information messages and the frequency point information messages of all the planes is completed.
The "fixed" in the state refers to fixed singleness, and the "sweeping" refers to scanning switching according to the input control message information; the method comprises the steps that the array surface information is switched from a starting angle to a terminating angle according to steps, the frequency point information is switched from a starting frequency to a terminating frequency according to steps, and two types of information are sent in a circulating mode during the frequency sweeping or array surface sweeping mode; the array information and frequency point information switching logic is used for controlling according to the input control message information;
the control message information comprises sweep frequency step Deltaf and initial frequency f start Termination frequency f end Step delta theta of scanning array surface and initial array surface angle theta start And terminating the array face angle theta end The method comprises the steps of carrying out a first treatment on the surface of the Wherein the sweep frequency step refers to a fixed difference value of each switching frequency point, and the calculation formula is f end ＝f start +n.DELTA.f, where N is the number of switching frequency points, n.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial frequency refers to the switching frequency from this frequency point; the termination frequency means that one frequency scanning period is completed when the frequency point is scanned; the scan plane step refers to each switchingThe fixed difference of the array face angle is calculated as theta end ＝θ start +r.DELTA.θ, where r is the number of single-array planar array angular switches, r.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial array face angle refers to the switching of the array face from the angle; terminating the array face angle means that the single array face scanning is completed when the array face angle is scanned;
In addition, a plane array, a frequency point silence time counter and a silence time t are arranged on the radar mo The method comprises the steps of carrying out a first treatment on the surface of the Setting a silence mark to be 1 in the silence time; when the radar is in the array plane and frequency point switching, the information sending and receiving of the radar is in a silence state, and the radar does not send pdw information and outputs a silence mark in silence time.
The self-adaptive attenuation module comprises an automatic reset unit, a storage unit, an amplitude value judging unit and an automatic attenuation unit;
the automatic reset unit acquires the distance s between the rear-end control center and the airborne detector and the rate refractive index of electromagnetic wave transmission in the current environment in real timeCalculating pdw maximum threshold t of waiting information receiving time of information receiving unit waitmax The calculation formula is ∈>If t wait ＞t waitmax Judging pdw information receiving overtime, transmitting a self-checking confirmation message to the airborne radar detector by the rear-end control center, and recording a confirmation time t after the message is transmitted con According to the formula->Calculating ideal information round trip transmission time->According to the formula->Calculating the round trip transmission time of the current actual information/>If->Judging that the transmission channel between the rear-end control center and the airborne detector is normal and the radar position is correct, and if the radar detection target information is abnormal, causing pdw information receiving overtime; if- >Or (b)Judging that a transmission channel between the rear-end control center and the airborne detector is normal, but the radar position is abnormal, so that pdw information is received overtime; if t con ＞t waitmax Judging that the transmission channel between the rear-end control center and the airborne detector is abnormal, and causing pdw information receiving overtime; wherein (1)>v is the transmission rate of electromagnetic waves in an ideal state, t wait The actual waiting time of the pdw information receiving unit is w is the sum of the frequency point switching times and the array surface switching times, the calculation formula is w=n+r, wherein the frequency point switching times and the array surface switching times in different radar detection states are overlapped, and w is required to be deleted at the moment; calculating the sum of message information transmission time between a rear-end control center and an onboard detector, time spent by the detector for detecting a frequency band and an array plane in the process of detecting a target object, and array plane and frequency point switching silence time between detection signals of the detector, and calculating the time of the whole radar detection signal, wherein the value is used as a maximum threshold value to limit the actual detection time, so that whether the current radar information reception is overtime or not can be known; if the detection target is overtime, carrying out abnormal determination on a transmission channel, a radar position and a detection target of the radar and a rear-end control center; by calculating the actual and ideal values of the transmission time between the radar and the back-end control center If the time is in the middle, the transmission channel is normal; if the radar position is smaller than the interval or larger than the interval but not larger than the overtime threshold, judging that the radar position is abnormal, and if the radar position is larger than the overtime threshold, judging that the target information is abnormal;
the storage unit is used for storing the original amplitude value A 0 The method comprises the steps of carrying out a first treatment on the surface of the The original amplitude value is an ideal amplitude value of the target to be detected;
the amplitude value judging unit compares the amplitude value of the received information with the stored amplitude value, and reserves the nearest value A of the adjacent amplitude information re The calculation formula is A re ＝Max(A＜A 0 ) Or A re ＝Min(A＞A 0 ) Wherein A is the amplitude value of the actual information; judging at this time A re The actual power j (A re ) Whether within the power maximum and minimum limit interval; the accuracy of the information can be ensured to the greatest extent by reserving the actual value of the amplitude value closest to the ideal target;
the automatic attenuation unit carries out attenuation operation according to the amplitude value judgment result; according to formula j (A at )＝j(A re )-a 0 Calculating the information power of the current information power after the conventional attenuation operation; if j (A) at )∈[j min ,j max ]Carrying out attenuation operation on the actual information power through a preset conventional attenuation value; if it isThe automatic attenuation switch is turned on, the original attenuation value is automatically adjusted by taking the attenuation self-adaptive variable quantity as a step, and the adjusted new original attenuation value is within the maximum and minimum power limit interval after the actual information power is attenuated;
When j (A) at )＞j max In the process, the calculation formula of the automatic attenuation is that
j com ＝Max{j(A re )-[a 0 +(n*Δa)]}∈[j min ,j max ]；
For j com Take j max Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if it isCalculating the n value to have decimal, then taking the maximum positive integer for n, and calculating j corresponding to the n value according to the adjusted n value com The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is com To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a maximum power value of (a); n is the number of adjustments of the original attenuation value, N ε N * The method comprises the steps of carrying out a first treatment on the surface of the At this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 ++ (n x Δa); the calculation result is continuously approximate to the power limiting interval through a formula, and the maximum value is taken as the actual value after attenuation which is required to meet the interval requirement;
when j (A) at )＜j min The automatic attenuation calculation formula is
j fin ＝Min{j(A re )-[a 0 -(n*Δa)]}∈[j min ,j max ]
For j fin Take j min Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if the calculated n value has decimal, the minimum positive integer is nearly taken for n, and j corresponding to the n value at the moment is calculated according to the n value just adjusted fin The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is fin To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a minimum power value of (1); at this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 - (n x Δa); and (3) continuously approaching the power limiting interval through the formula calculation result, and taking the minimum value, wherein the minimum value is the actual value after attenuation which is required to meet the interval requirement.
The self-adaptive attenuation module receives the attenuation message information transmitted by the analysis module, and takes the information as an original attenuation input value; the original attenuation input values include original attenuation values a 0 Original amplitude value A 0 Maximum and minimum power limit interval j min ,j max ]An adaptive variation Δa; the automatic attenuation switch is positioned in the automatic attenuation unit and is used for starting automatic attenuation operation on the value of the actual signal power value which is not in the maximum and minimum limiting interval.
The output module comprises an array plane and frequency point information output unit and an attenuation value output unit; the array plane and frequency point information output unit carries out delay adjustment on the array plane information and the frequency point information sent by the radar, and controls microwaves on the adjusted messages of the array plane and the sweep frequency information; the attenuation value output unit outputs according to the automatic attenuation result, and if the actual power value does not perform automatic attenuation operation, the original attenuation value is output; if the actual power is subjected to automatic attenuation operation, outputting the processed automatic attenuation value, and taking the attenuation value as a new original attenuation value.
In an embodiment:
an existing airborne radar adopts an airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic; a control command is issued by a technician at the rear end through an upper computer, the command is sent to a radar end through SPI, 8-byte message information is obtained through analyzing the control command, and corresponding data including local oscillation frequency 10GHz, sweep frequency range [5GHz,10GHz ] are extracted from the message information according to the data placement position ]Frequency sweep bandwidth 1GHz, frequency step 1GHz, sweep face angle interval [0,150 ]]The scanning speed is 30/s, the scanning step is 30, the silence time is 0.2s, and data are input into the microwave control module; setting an initial reconnaissance state of a radar as a sweep scanning plane according to input initial data by a first state machine in a control module, firstly transmitting an array plane 1 information message to a microwave module by the radar in a single plane, then incrementally transmitting a frequency point information message according to frequency steps from a starting frequency to a terminating frequency, regarding as sweep logic for completing one plane, entering a silence time when a middle frequency point is switched, clearing 0 the current single plane state, entering the silence time to output a silence mark 1, entering the next plane after the silence time, and repeating the operation until all reconnaissance of 5 plane information is completed; according to formula f end ＝f start +n Δf is calculated n is 5; according to the formula theta end ＝θ start Calculating r to be 5 by +r; the transmitted information message data is subjected to delay adjustment, so that output data are aligned, and finally, the processed message control microwaves containing the array surface and the sweep frequency information are output;
extracting the original attenuation value of 10dBm, the original amplitude value of 40dBm and the maximum power from the message by analyzing the control instruction message issued by the upper computer Minimum limit [20dBm,60dBm]Self-adaptive variable quantity of 5dBm; inputting the analysis data as original attenuation data into an automatic attenuation module; in the automatic attenuation module, the distance between the acquisition rear end control center and the airborne detector is 50km, and the rate refractive index of the current environment electromagnetic wave transmission is 0.95; according to the formulaCalculating a maximum threshold t of latency waitmax 15s; waiting time t for current pdw information receiving unit to receive pdw information wait 10s due to t wait ＜t waitmax Then the current pdw information reception has not timed out; carrying out under-band comparison on the amplitude value of the received information and the original amplitude value, reserving the nearest value of the adjacent amplitude information, and according to the formula A re ＝Min(A＞A 0 ) Then A re 80dBm; according to formula j (A at )＝j(A re )-a 0 The information power after the current information power is subjected to conventional attenuation is calculated to be 70dBm, and j (A at )＞j max Opening the automatic attenuation switch, increasing and attenuating the power of the current information by taking the adaptive variable quantity as the attenuation step until the power value after attenuation is within the maximum and minimum limit intervals, and according to a formula j com ＝Max{j(A re )-[a 0 +(n*Δa)]}∈[j min ,j max ]For j com Take j max Calculating the value of n, and obtaining a result of 2; according to formula a new ＝a 0 When the new original attenuation value after automatic attenuation is calculated to be 20dBm, the automatic attenuation value at the moment is output to be 20dBm.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The airborne radar reconnaissance digital system based on sweep frequency control and automatic attenuation logic is characterized in that: the airborne radar reconnaissance digital system based on the sweep frequency control and the automatic attenuation logic consists of an airborne radar detector and a rear-end control center, wherein the rear-end control center comprises an instruction control module, an analysis module, a microwave control module, a self-adaptive attenuation module and an output module;
the instruction control module transmits a message instruction to the airborne radar by the upper computer; the analysis module analyzes the instruction message, extracts the required information and transmits the information to the microwave control module; the microwave control module utilizes the initial data to complete array surface switching and sweep frequency control of the airborne radar in operation; the self-adaptive attenuation module dynamically adjusts signals received by the airborne radar in the reconnaissance process; the output module outputs the adjusted correct signal;
the instruction control module is connected with the analysis module; the analysis module is connected with the microwave control module; the microwave control module is connected with the self-adaptive attenuation module; the self-adaptive attenuation module is connected with the output module.
2. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 1, wherein: the instruction control module comprises an instruction generation unit and an instruction transmission unit; the instruction generating unit sets radar initial data by an upper computer and generates the data into an instruction message; the instruction transmission unit sends the generated instruction message to the operation radar through the spi.
3. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 2, wherein: the upper computer of the airborne radar is equipment for controlling and monitoring a radar system; the system is generally composed of a computer and corresponding software and algorithms, and is used for controlling the operation mode, parameter setting, data processing and display functions of the radar; the upper computer can receive the data acquired by the radar sensor, process and analyze the data in real time, and provide the analysis result with data and image information for operators through the user display end; the instruction transmission unit performs data transmission with the airborne radar in a wireless transmission mode.
4. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 3, wherein: the analysis module comprises a message analysis unit, an array plane and frequency point information extraction unit and an attenuation information extraction unit; the message analysis unit receives the instruction message, analyzes the message and acquires information data initially set by the upper computer for the radar; the array plane and frequency point information extraction unit is used for placing corresponding parameter value logic according to different message positions according to the message content interacted with an external message, and extracting the required local oscillation frequency f from the corresponding position of the input message o Fixed frequency f d Frequency band of sweep [ f ] start ,f end ]The sweep bandwidth B, the fixed array face angle theta and the sweep face angle interval [ theta ] start ,θ end ]Rate of scan plane theta sp Inputting the extracted message information into a microwave control module; the attenuation information extraction unit is used for placing corresponding parameter value logic according to different message positions according to the message content interacted with the external message, and extracting parameters required by controlling the automatic attenuation function from the corresponding positions of the input message, wherein the parameters comprise an original attenuation value a 0 Original webDegree value A 0 Attenuation adaptive variation delta a, maximum and minimum power limit interval j min ,j max ]And decay reset delay t 0 And inputting the extracted message information into an adaptive attenuation module.
5. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 4, wherein: the microwave control module comprises a first state machine, a second state machine and a pdw information receiving unit; the first state machine is used as radar reconnaissance state jump control equipment and is used for array plane switching and sweep frequency control during radar reconnaissance; the first state machine receives the message information transmitted by the analysis module, judges the frequency and the array surface type of the current radar input for the first time according to the message information, and sends the judging result to the second state machine as a control message; the second state machine receives the control message and controls the state content of the actual operation of the airborne radar according to the message content; the pdw information receiving unit is configured to receive pdw information reflected by a detection target.
6. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 5, wherein: four reconnaissance states are respectively a fixed frequency array surface, a sweep frequency array surface and a sweep frequency array surface when the radar performs reconnaissance operation; if the detection state of the radar is a fixed-frequency fixed-array plane, the radar firstly sends an array plane information message to the microwave module, and then sends a frequency point information message; if the reconnaissance state of the radar is a sweep frequency array plane, the radar firstly transmits an array plane information message to the microwave module, then transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increment mode, and is regarded as a sweep frequency logic for completing one array plane, and then transmits second array plane information and circulating frequency point switching information according to the logic, so that the information is pushed until all the array plane and frequency point information is transmitted; if the reconnaissance state of the radar is the sweep frequency array surface, the radar firstly transmits an array surface information message to the microwave module, and then the radar transmits a frequency point information message from the initial frequency to the termination frequency in a frequency step increasing way; if the detection state of the radar is a fixed-frequency scanning plane, the radar firstly transmits a plane information message to the microwave module, then transmits a frequency point information message, then transmits a second plane information message, then transmits a frequency point information message, and the like, so that the transmission of the information messages and the frequency point information messages of all the planes is completed.
7. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 6, wherein: the array surface information is switched from the initial angle to the final angle according to steps, the frequency point information is switched from the initial frequency to the final frequency according to steps, and the two types of information are circularly transmitted in the sweep frequency or the array surface scanning mode; the array information and frequency point information switching logic is used for controlling according to the input control message information;
the control message information comprises sweep frequency step Deltaf and initial frequency f start Termination frequency f end Step delta theta of scanning array surface and initial array surface angle theta start And terminating the array face angle theta end Information; wherein the sweep frequency step refers to a fixed difference value of each switching frequency point, and the calculation formula is f end ＝f start +n.DELTA.f, where N is the number of switching frequency points, n.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial frequency refers to the switching frequency from this frequency point; the termination frequency means that one frequency scanning period is completed when the frequency point is scanned; the scan plane step refers to a fixed difference value of the angle of each switching plane, and the calculation formula is theta end ＝θ start +r.DELTA.θ, where r is the number of single-array planar array angular switches, r.epsilon.N * The method comprises the steps of carrying out a first treatment on the surface of the The initial array face angle refers to the switching of the array face from the angle; terminating the array face angle means that the single array face scanning is completed when the array face angle is scanned;
In addition, a plane array, a frequency point silence time counter and a silence time t are arranged on the radar mo The method comprises the steps of carrying out a first treatment on the surface of the Setting a silence mark to be 1 in the silence time; when the radar is in the array plane and frequency point switching, the information sending and receiving of the radar is in a silence state, and the radar does not send pdw information and outputs a silence mark in silence time.
8. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 7, wherein: the self-adaptive attenuation module comprises an automatic reset unit, a storage unit, an amplitude value judging unit and an automatic attenuation unit;
the automatic reset unit acquires the distance s between the rear-end control center and the airborne detector and the rate refractive index of electromagnetic wave transmission in the current environment in real timeCalculating pdw maximum threshold t of waiting information receiving time of information receiving unit waitmax The calculation formula is ∈>If t wait ＞t waitmax Judging pdw information receiving overtime, transmitting a self-checking confirmation message to the airborne radar detector by the rear-end control center, and recording a confirmation time t after the message is transmitted con According to the formula->Calculating ideal information round trip transmission time->According to the formula->Calculating the round trip transmission time of the current actual information>If->Judging that the transmission channel between the rear-end control center and the airborne detector is normal and the radar position is correct, and judging that the radar detection target information is abnormal Causing pdw information reception to timeout; if->Or (b)Judging that a transmission channel between the rear-end control center and the airborne detector is normal, but the radar position is abnormal, so that pdw information is received overtime; if t con ＞t waitmax Judging that the transmission channel between the rear-end control center and the airborne detector is abnormal, and causing pdw information receiving overtime; wherein (1)>v is the transmission rate of electromagnetic waves in an ideal state, t wait The actual waiting time of the pdw information receiving unit is w is the sum of the frequency point switching times and the array surface switching times, the calculation formula is w=n+r, wherein the frequency point switching times and the array surface switching times in different radar detection states are overlapped, and w is required to be deleted at the moment;
the storage unit is used for storing the original amplitude value A 0 ；
The amplitude value judging unit compares the amplitude value of the received information with the stored amplitude value, and reserves the nearest value A of the adjacent amplitude information re The calculation formula is A re ＝Max(A＜A 0 ) Or A re ＝Min(A＞A 0 ) Wherein A is the amplitude value of the actual information; judging at this time A re The actual power j (A re ) Whether within the power maximum and minimum limit interval;
the automatic attenuation unit carries out attenuation operation according to the amplitude value judgment result; according to formula j (A at )＝j(A re )-a 0 Calculating the information power of the current information power after the conventional attenuation operation; if j (A) at )∈[j min ,j max ]Carrying out attenuation operation on the actual information power through a preset conventional attenuation value; if it isThe automatic attenuation switch is turned on, the original attenuation value is automatically adjusted by taking the attenuation self-adaptive variable quantity as a step, and the adjusted new original attenuation value is within the maximum and minimum power limit interval after the actual information power is attenuated;
when j (A) at )＞j max In the process, the calculation formula of the automatic attenuation is that
j com ＝Max{j(A re )-[a 0 +(n*Δa)]}∈[j min ,j max ]；
For j com Take j max Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if the calculated n value has decimal, the maximum positive integer is nearly taken for n, and j corresponding to the n value at the moment is calculated according to the adjusted n value com The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is com To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a maximum power value of (a); n is the number of adjustments of the original attenuation value, N ε N * The method comprises the steps of carrying out a first treatment on the surface of the At this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 +(n*Δa)；
When j (A) at )＜j min The automatic attenuation calculation formula is
j fin ＝Min{j(A re )-[a 0 -(n*Δa)]}∈[j min ,j max ]
For j fin Take j min Calculating the value of n, and if the calculation result is a positive integer, completing calculation; if the calculated n value has decimal, the minimum positive integer is nearly taken for n, and j corresponding to the n value at the moment is calculated according to the n value just adjusted fin The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is fin To satisfy j after automatic attenuation com ∈[j min ,j max ]Is a minimum power value of (1); at this time, the calculation formula of the new original attenuation value after automatic attenuation is a new ＝a 0 -(n*Δa)。
9. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 8, whichIs characterized in that: the self-adaptive attenuation module receives the attenuation message information transmitted by the analysis module, and takes the information as an original attenuation input value; the original attenuation input values include original attenuation values a 0 Original amplitude value A 0 Maximum and minimum power limit interval j min ,j max ]An adaptive variation Δa; the automatic attenuation switch is positioned in the automatic attenuation unit and is used for starting automatic attenuation operation on the value of the actual signal power value which is not in the maximum and minimum limiting interval.
10. The airborne radar reconnaissance digital system based on sweep control and automatic attenuation logic of claim 9, wherein: the output module comprises an array plane and frequency point information output unit and an attenuation value output unit; the array plane and frequency point information output unit carries out delay adjustment on the array plane information and the frequency point information sent by the radar, and controls microwaves on the adjusted messages of the array plane and the sweep frequency information; the attenuation value output unit outputs according to the automatic attenuation result, and if the actual power value does not perform automatic attenuation operation, the original attenuation value is output; if the actual power is subjected to automatic attenuation operation, outputting the processed automatic attenuation value, and taking the attenuation value as a new original attenuation value.
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