CN117330191A - Resonant frequency built-in cyclic search method with adjustable parameters - Google Patents
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses a resonance frequency built-in circulation search method with adjustable parameters, which belongs to the technical field of infrared spectrum remote sensing detection, and is realized by lowering the search circulation of a software layer into a board card chip, so that the communication frequency in software and hardware is greatly reduced, and the constraint of transmission overhead on hardware time sequence is reduced. The invention comprises upper and lower layer designs called by the hardware logic function of the board chip and the upper computer application software according to types; the adjustable step length and the search range near the specific frequency point are realized through bottom hardware; the upper computer application software can flexibly set parameters and call times according to different working states of the system. The invention can obviously shorten the time for preparing the adjustment state of the radiation spectrum measurement system, realize reasonable modulation modes corresponding to different system states, balance the response speed of the detection system and is beneficial to the intelligent upgrading and improvement of products.
Description
Technical Field
The invention belongs to the technical field of infrared spectrum remote sensing detection, and particularly relates to a resonance frequency built-in cyclic search method with adjustable parameters.
Background
In an infrared spectrum measurement system, the extraction and processing of a point target radiation signal are core technologies, and the main difficulties are as follows: suppressing environmental noise and accurate localization of the target. Therefore, the effective measurement of the point target must take into consideration the influence of the atmospheric state on the detection capability of the system, and in addition, various background radiation noises, the electromagnetic environment of the system and working heat can also generate serious interference on the infrared radiation signals of the target. For these practical problems, the current main solution is to modulate the input optical signal with a vibrating mirror.
The spectrum detector is designed into A, B two rows with identical materials and dimensions, a plurality of different acquisition channels are arranged according to the dispersion effect, and the optical signals containing target information are switched back and forth on the A, B two rows of detection units along with the vibration of the vibrating reflector, as shown in fig. 1. The electric signals converted by the A, B-column detection units are output in a differential amplification mode, so that the background signals of the atmospheric background radiation can be subtracted, and the high-sensitivity detection of the target radiation signals is realized. It follows that accurate switching of the optical signal by the vibrating mirror is critical and central to the overall radiometric system, and therefore the energy required to synchronize the vibrating frequency of the vibrating mirror with the reference signal to achieve a resonant state is extremely high. However, on the one hand, differences in the operating state of the device are caused by seasonal and weather variations involved in the environment in which the device is located; on the other hand, due to the high frequency vibration of the mirror itself, it will cause a thermal environment shift of itself and surrounding auxiliary devices. Therefore, the key problem of ensuring the infrared radiation spectrum measurement system to realize high-precision measurement performance is converted into: how to realize the rapid search and modulation of the resonant frequency of the vibrating mirror.
For basic search logic, the vibration device is required to traverse a plurality of frequency points within a certain range and check response parameters, in the traditional method, only the software algorithm of the upper computer is used for controlling the IO resources of the bottom device in a back-and-forth command mode, so that occupation of IO resources of the bottom device is large, time consumption is long, even time sequence dislocation is easy to cause due to environmental influence, and therefore traversing search is more reasonable to realize by adopting the FPGA in the bottom chip; however, the complete hardware implementation also has the defect of insufficient flexibility, and the relatively single operation logic is insufficient to cope with various different working conditions faced in the actual operation of the system.
The traditional resonant frequency traversal searching method is generally implemented in upper computer application software, and the bottom hardware comprises a bottom hardware control board, and only provides basic API interfaces such as setting, inquiring and the like. Single searchThe repeated operation control is required for each frequency point, and the repeated operations such as the set frequency, the query amplitude, the return amplitude and the like are performed to compare the amplitudes，……/>Finding the amplitude ∈of the maximum value>Corresponding frequency->Moreover, the cost of resources occupied by the calling GPIO in the bottom hardware is far greater than that of single logic calculation in the FPGA; even in the most ideal case, the traversal of n frequency sampling points needs to be performed for a total of 4n IO transmissions, as shown in fig. 2; moreover, due to the fact that frame loss or time sequence dislocation is easy to occur due to the delay effect of the bottom hardware when IO resources are called, repeated retransmission and success/failure judgment of a single command are needed, and resource occupation and delay are further improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a resonant frequency built-in circulation search method with adjustable parameters based on the real-time adjustment requirement of the working frequency (resonant state) of a vibrating reflector in an infrared spectrum radiation information acquisition system. On one hand, the traversing search function originally realized in the upper computer software is transplanted into the bottom FPGA, so that the cost of the single traversing search function on IO transmission is reduced from 4n times to 2 times; meanwhile, the method is different from the traditional solidification operation mode of the bottom layer function, and three adjustable parameters of a reference frequency point f, a search step length s and a search point number n are provided for the upper computer application software so as to realize flexible control of a search flow.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a resonance frequency built-in cyclic search method with adjustable parameters comprises the following steps:
step one, the traversing searching logic realized by the upper computer application software is put down into a board card chip, and the resonant frequency modulation of the vibrating reflector is realized through the traversing searching of a hardware logic function;
step two, a parameter input interface is reserved on the hardware logic function, wherein the input parameters are a reference frequency point f, a search step length s and a search point number n respectively, namely, in the following stepsInquiring feedback response voltage of the vibrating mirror every other search step s in the search range, and finally outputting a frequency value of the maximum position of the feedback response voltage;
and thirdly, flexibly setting different searching step s and searching ranges by the upper computer application software according to different working states of the infrared spectrum measuring system, and calling a lower hardware logic function to find out the resonant frequency of the vibrating reflector.
And in the fourth step, when the number n of search points is greater than a threshold value, setting search step sizes s of different orders by using upper computer application software and calling a hardware logic function to perform hierarchical search so as to optimize the search efficiency.
In the second step, the FPGA in the bottom chip realizes the traversal search of the hardware logic function, and the hardware logic function performs the total (2n+1) searches from-n to +n with the reference frequency point f as the center and every search step s by adjusting the input parameters.
Further, in the third step, in the automatic mode, the hardware logic function is called every 2 minutes in the standby state; searching is not carried out in the measurement task, the running time of the task is recorded, and the number of searching points n which are increased according to the running time conversion of the previous task in the standby state after the task; in the manual mode, the search interval, the search step s, and the search point n each time are set at the interface, or the search function is turned off.
Further, in the fourth step, according to the initial operating frequencySetting the frequency search range asPerforming first-stage search on the vibrating mirror at a frequency interval of 1 Hz; then according to the extremum frequency of the first level search +.>Setting the frequency search range to +.>The second-stage search is carried out on the oscillating mirror with a frequency interval of 0.1Hz, and finally the extreme frequency of the second-stage search is +.>Is the resonant frequency.
The beneficial effects are that:
with the progress and development of photoelectric technology, and considering that the observation sites are mostly located in geographical positions with severe natural conditions, the requirements on remote sensing detection equipment are becoming more and more remote, intelligent and automatic. Therefore, the optimal working state debugging of the detection system also requires an automatic operation flow which is changed from the traditional knob type manual judgment to unmanned control. According to the invention, the rapid search of the resonant frequency of the vibrating reflector in the current working environment and the following adjustment of the optimal working state of the vibrating reflector when the environmental parameters are changed can be realized through the software program, so that the automatic processing of the measurement work which is originally required to be continuously judged and controlled by an operator can be realized. Meanwhile, the invention can greatly shorten the time for preparing the adjustment state of the radiation spectrum measurement system and improve the stability of the system. The invention can support the selection and adjustment of the optimal working state of the vibrating reflector, and the searching mode of the upper and lower comprehensive design can also greatly reduce the time and space expenditure for searching the resonant frequency point on the premise of ensuring the searching accuracy.
Drawings
FIG. 1 is a schematic diagram of the operation of a vibrating mirror;
FIG. 2 is a schematic diagram of IO transmissions of a conventional traversal search process;
FIG. 3 is a schematic flow chart of a method for searching for a resonant frequency built-in loop with adjustable parameters according to the present invention;
FIG. 4 is a schematic diagram of implementation steps of a resonant frequency built-in cyclic search method with adjustable parameters according to the present invention;
FIG. 5 is a schematic diagram of the amplitude response of a vibrating mirror to different operating frequencies.
Detailed Description
The present invention will be described in further detail with reference to examples below in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention judges and selects the resonant frequency of the vibrating reflector through the maximum value of the signal amplitude fed back by the detector, considers the heating phenomenon caused by the self high-frequency vibration of the equipment and the deviation of the resonant point of the equipment caused by the possible change of the environmental state (temperature, humidity, air pressure and the like), and needs to modulate and calibrate the resonant frequency of the vibrating reflector in real time. The method is characterized in that the method is based on granularity and search range which can be responded by the modulator, an upper layer and lower layer comprehensive design mode is adopted, a relatively complex traversal search process is lowered into an FPGA in a bottom layer chip to be realized, three input parameters including a reference frequency point f, a search step length s and a search point number n are provided, the method is beneficial to rapidly positioning a resonance point while guaranteeing the search range and the search precision, and a more flexible search strategy can be adopted according to different states of equipment operation.
As shown in FIG. 3, on one hand, the traversal search function originally realized in the application software of the upper computer is transplanted into the bottom FPGA, so that the cost of the single traversal search function on IO transmission is reduced from 4n times to 2 times; meanwhile, the method is different from the traditional solidification operation mode of the bottom layer function, and three adjustable parameters of a reference frequency point f, a search step length s and a search point number n are provided for the upper computer application software so as to realize flexible control of a search flow. The method comprises the steps of inputting a reference frequency point F, a search step s and a search point number n into an FPGA interface function H (F, s, n) through upper computer application software, obtaining an optimal frequency point F and a corresponding amplitude A, and inputting the optimal frequency point F and the corresponding amplitude A into the upper computer application software.
As shown in fig. 4, the method for searching the resonant frequency built-in loop with adjustable parameters comprises the following specific steps:
step one, the traversing searching logic realized by the traditional upper computer application software is downloaded into the board card chip (namely the traversing searching logic), and the resonant frequency modulation of the vibrating reflector is realized through the traversing searching of the hardware logic function. The upper computer software only needs to be called once, and the hardware logic function conducts traversal search on the frequency points in the set range in the vibrating mirror control panel until the frequency sampling point with the largest response is found out for feedback. The upper layer and the lower layer are comprehensively designed in a way that IO call is avoided repeatedly between the upper layer and the lower layer, so that the difficulty of communication processing and delay waiting time are greatly reduced; on the other hand, as only the calling and feedback logic are arranged on the head and tail sides of the traversing search logic in a classified manner, the resource occupation and delay effect of the IO ports cannot influence the traversing search logic, so that the risk of time sequence dislocation is avoided, and the safety of the system is improved.
Step two, a parameter input interface is reserved on the hardware logic function (i.e. adjustable parameters are provided upwards), and the three input parameters are respectively a reference frequency point f, a search step length s and a search point number n, namely in the following stepsAnd (3) inquiring the feedback response voltage of the vibrating mirror every other search step s in the search range, and finally outputting the frequency value of the maximum position of the feedback response voltage. The design can promote the flexibility of traversing search of the hardware logic function, so that the hardware logic function can cope with different frequency point positions, different search precision and different search ranges.
And thirdly, flexibly setting different searching step sizes s and searching ranges by the upper computer application software according to different working states of the infrared spectrum measuring system, and calling a lower hardware logic function to find out a resonance frequency point of the vibrating reflector (namely, selecting different parameters according to the working states by the application layer and calling the searching function). For example, the standby state, the working state, the running state and the manual running state of the system are inconsistent in modulation requirement and processing time, so that the traversing search precision and the interrupt delay can be adjusted through different search step sizes s and search point numbers n.
Step four, because the number n of search points of single search in the lower hardware logic function is not too large, when a large data volume (such as n > 100) is required to be searched under some special conditions (such as system initialization), hierarchical search can be performed by setting different levels of search step s through the application software of the upper computer in a mode of compositely calling the hardware logic function (namely, in special conditions, the hierarchical search is realized by adopting a compositely calling mode). Compared with the method for carrying out large-scale search by directly adopting fine step length, the hierarchical search mode of compound call can greatly reduce the number of calculation processing points; the overhead of hardware resources and processing delay can be reduced to achieve optimization of search efficiency.
Specifically, in the second step, the hardware logic function implemented by the FPGA of the hardware board has the feature of adjustable parameters, and the three input parameters are the reference frequency point f, the search step s, and the search point n, respectively; that is, the total (2n+1) search from-n to +n is performed every search step s with the reference frequency point f as the center. The adjustable search point number n determines the time overhead of single call of the bottom hardware, and the search step size s determines the precision of frequency measurement. Considering that the mechanical movement of the vibrating mirror causes a heating phenomenon, the change of the working temperature causes the shift of the resonant frequency, and the traversing search of the resonant frequency is the high-frequency operation on the mechanical movement state of the vibrating mirror, the number n of the searching points of the bottom layer is not too large, otherwise, the higher delay and the deviation of the system stability are caused.
Specifically, in the third step, in the automatic mode of the infrared spectrum measurement system, a hardware logic function is called once every 2 minutes (taking the frequency of the current galvanometer feedback as a reference, 0.1Hz as a step length, and the number of search points as 5, as shown in fig. 3) in a standby state; in the standby state after the task, the increased search point n is reasonably converted according to the previous task running time (for example, every 3 minutes the running time is more than, the subsequent search point +1 is not more than 10 at maximum, and the subsequent search point n is gradually decreased). In the manual mode of the system, the search interval, the search step s and the search point n of each time can be set through the interface, and even the search function is closed.
Specifically, in the fourth step, the initial operating frequency is usedSetting the frequency search range asPerforming first-stage search on the vibrating mirror at a frequency interval of 1 Hz; then according to the extremum frequency of the first level search +.>Setting the frequency search range to +.>The second-stage search is carried out on the oscillating mirror with a frequency interval of 0.1Hz, and finally the extreme frequency of the second-stage search is +.>Is the resonant frequency. Purely algorithmically, recursive dichotomy search (++>Hierarchical call, N is total calculated times), but considering IO resource overhead and delay of upper computer application software and underlying hardware transfer information, and feedback signal time sequence dislocation possibly caused by repeated reading and writing of hardware chip cache, the adoption of ∈1 is not suggested in practical engineering>The hierarchy call is carried out, and the total data size in the project is preferably 2-3 hierarchy levels.
Notably, it is noted thatIn practical engineering application, the upper computer application software generally needs to send commands for reading state parameters (including amplitude, frequency, phase, etc.) for multiple times, and average value is obtained after eliminating larger errors of the obtained amplitude data, so as to prevent system errors caused by unstable signals or device jamming. In order to reduce the cost and delay of IO resources between the upper layer and the lower layer, the function of reading and averaging for multiple times can be realized in the bottom logic, and the minimization of communication transmission cost is realized. In addition, the frequency search range is set in consideration of the fact that the working state and working environment of the device are not changed greatly, only the amplitude response near the resonance frequency has obvious monotone increasing/decreasing phenomenon, the position far away is greatly disturbed by noise, as shown in figure 5, wherein A represents the amplitude of the response, and Am is the sum of the amplitude responseCorresponding to a particular amplitude value.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (5)
1. The resonant frequency built-in cyclic search method with adjustable parameters is characterized by comprising the following steps:
step one, the traversing searching logic realized by the upper computer application software is put down into a board card chip, and the resonant frequency modulation of the vibrating reflector is realized through the traversing searching of a hardware logic function;
step two, a parameter input interface is reserved on the hardware logic function, wherein the input parameters are a reference frequency point f, a search step length s and a search point number n respectively, namely, in the following stepsInquiring feedback response voltage of the vibrating mirror every other search step s in the search range, and finally outputting a frequency value of the maximum position of the feedback response voltage;
and thirdly, flexibly setting different searching step s and searching ranges by the upper computer application software according to different working states of the infrared spectrum measuring system, and calling a lower hardware logic function to find out the resonant frequency of the vibrating reflector.
2. The method for searching the resonance frequency built-in loop with the adjustable parameters according to claim 1, further comprising a step four, wherein in the step four, when the number n of search points is greater than a threshold value, search step steps s with different magnitudes are set through upper computer application software, and a hardware logic function is called for hierarchical search, so that the search efficiency is optimized.
3. The method for searching the resonance frequency built-in loop of the adjustable parameter according to claim 1, wherein the method comprises the following steps: in the second step, the FPGA in the bottom chip is used for realizing traversal search of the hardware logic function, and the hardware logic function carries out total (2n+1) search from-n to +n every search step s by taking the reference frequency point f as the center through adjusting the input parameter.
4. The method for searching the resonance frequency built-in loop of the adjustable parameter according to claim 1, wherein the method comprises the following steps: in the third step, in the automatic mode, the hardware logic function is called every 2 minutes in the standby state; searching is not carried out in the measurement task, the running time of the task is recorded, and the number of searching points n which are increased according to the running time conversion of the previous task in the standby state after the task; in the manual mode, the search interval, the search step s, and the search point n each time are set at the interface, or the search function is turned off.
5. The method for searching the resonance frequency built-in loop of the adjustable parameter according to claim 2, wherein the method comprises the following steps: in the fourth step, according to the initial working frequencySetting the frequency search range to +.>Performing first-stage search on the vibrating mirror at a frequency interval of 1 Hz; then according to the extremum frequency of the first level search +.>Setting the frequency search range to +.>The second-stage search is carried out on the oscillating mirror with a frequency interval of 0.1Hz, and finally the extreme frequency of the second-stage search is +.>Is the resonant frequency.
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