CN115657938A - Rapid storage method for passive microwave radiation measurement of unmanned aerial vehicle - Google Patents
Rapid storage method for passive microwave radiation measurement of unmanned aerial vehicle Download PDFInfo
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Abstract
The invention discloses a rapid storage method for passive microwave radiation measurement of an unmanned aerial vehicle, which comprises the following steps: step one, building a hardware system; step two, data acquisition; step three, data preprocessing and coding; step four, storing data; the SD double polling writing method based on timer triggering under the multitask frame is adopted, and by adopting a time-sharing processing technology and a polling structure, the SD double polling writing method realizes stable, reliable and high-speed SD storage under the requirement of uninterrupted acquisition of the unmanned aerial vehicle-mounted microwave radiometer, solves the problem of data storage during the continuous acquisition of passive microwave radiometer of the unmanned aerial vehicle, can greatly reduce the time occupied by storage under the condition of not influencing the normal sampling task of the unmanned aerial vehicle-mounted radiometer, ensures the space continuity of ground data, is beneficial to subsequent data processing and image splicing, has good portability, and can be used for improving the data storage efficiency under the multitask frame besides the unmanned aerial vehicle radiometer.
Description
Technical Field
The invention relates to the technical field of information storage, in particular to a rapid storage method for passive microwave radiation measurement of an unmanned aerial vehicle.
Background
The microwave radiometer is a high-sensitivity broadband noise receiver working in a microwave band, can extract the variation of a weak microwave radiation signal from strong background noise, and mainly processes Gaussian white noise radiated by a ground object target. The unmanned airborne microwave radiometer has the advantages of high spatial resolution, convenience in operation, strong real-time performance, low cost and the like, can perform light temperature observation on land scale, provides data support for model inversion of soil moisture monitoring and snow observation and ground verification of satellites, fills the blank that the low resolution (-25 km) of the satellite-borne radiometer cannot meet the application requirements of medium and small scales, and overcomes the defects of small observation range, poor mobility and easy terrain limitation of a foundation radiometer.
The detection sensitivity of a microwave radiometer is related to the bandwidth of the receiver and the integration time, the higher the product of the bandwidth and the integration time, the higher the sensitivity. However, there are limitations in practical design, for example, the international union of electric lines regulates the usage of each frequency band, which results in that the bandwidth of the microwave radiometer cannot be too large, especially for the frequency bands with more usage, such as L and S; one of the most important advantages of unmanned airborne data is that the spatial-temporal resolution is high, which also results in an integration time that is not too long. The high-speed acquisition can enable the unmanned aerial vehicle-carried microwave radiometer to obtain microwave remote sensing data with higher space-time resolution, and is beneficial to detection and suppression of radio frequency interference. Aiming at a rapidly changing ground object target, in order to ensure data quality and realize interference detection and suppression, integration time must be reduced and sampling frequency must be increased, but online transmission cannot be realized due to a large amount of data brought by the integration time.
Disclosure of Invention
The invention aims to provide a rapid storage method for passive microwave radiometric measurement of an unmanned aerial vehicle, which aims to solve the problems that a large amount of continuous time cannot be allocated for data storage due to the high sampling rate provided in the background art, and the conventional storage method cannot meet the requirement of rapid data storage under a multitask framework.
In order to achieve the purpose, the invention provides the following technical scheme: a rapid storage method for passive microwave radiometric measurement of an unmanned aerial vehicle comprises the following steps: step one, building a hardware system; step two, data acquisition; step three, data preprocessing and coding; step four, storing data;
in the first step, firstly, a hardware system of the passive microwave radiation measuring device of the unmanned aerial vehicle is built, wherein the hardware system specifically comprises an antenna, a matched load, a radio frequency switch, a first low noise amplifier, a band-pass filter, a second low noise amplifier, a mixing circuit, an intermediate frequency amplifier, a variable gain amplifier, a square law detector, a video amplifier, an AD sampling unit, a micro control unit MCU, a temperature measuring unit, an SD memory, a DA control circuit and a GPS module.
Wherein in the second step, the method specifically comprises the following steps:
2.1 measuring the brightness temperature of the target object through an antenna to obtain a brightness temperature signal of the target object;
2.2, measuring and measuring the temperature of the matched load and each internal device through a temperature measuring unit to obtain temperature signals of the matched load and each internal device;
2.3 acquiring flight attitude information of the unmanned aerial vehicle through a GPS module to acquire a GPS signal, wherein the flight attitude information comprises time, longitude and latitude, high rise, course angle and speed;
wherein in the third step, the method specifically comprises the following steps:
3.1, after the brightness temperature signal of the target object obtained in the step 2.1 is subjected to frequency mixing, amplification, demodulation and AD sampling, the brightness temperature signal is transmitted to a Micro Control Unit (MCU) through an SPI interface, and the Micro Control Unit (MCU) carries out preprocessing and coding;
3.2, transmitting the temperature signals of the matched load and the internal devices acquired in the step 2.2 to a micro control unit MCU through an SPI interface, and carrying out preprocessing and coding by the micro control unit MCU;
3.3, after level conversion is carried out on the GPS signal obtained in the step 2.3, the TTL level is converted into the RS232 standard level, the TTL level is connected with a serial port of a micro control unit MCU for communication, the data format adopts an NMEA0183 protocol, and the micro control unit MCU carries out preprocessing and coding;
in the fourth step, the MCU writes the data preprocessed and encoded in the third step into the SD memory by using a timer-triggered SD double Polling Method (DPSM) to implement data Storage.
Preferably, in the first step, the MCU is electrically connected to an AD sampling unit, a DA control circuit, a temperature measuring unit, an SD memory, a GPS module and a radio frequency switch, the radio frequency switch is electrically connected to an antenna, a matching load and a first low noise amplifier, the first low noise amplifier is electrically connected to a band pass filter, the band pass filter is electrically connected to a second low noise amplifier, the second low noise amplifier is electrically connected to a mixer circuit, the mixer circuit is electrically connected to a local oscillator and an intermediate frequency amplifier, the intermediate frequency amplifier is electrically connected to a variable gain amplifier, the variable gain amplifier is electrically connected to the DA control circuit, the variable gain amplifier is electrically connected to a square law detector, the square law detector is electrically connected to a video amplifier, and the video amplifier is electrically connected to the AD sampling unit.
Preferably, the SD memory is connected to the MCU through a Secure Digital Input and Output (SDIO) interface, and the SD memory adopts a Direct Memory Access (DMA) mode.
Preferably, the MCU adopts an STM32F103ZET6 chip, the AD sampling unit adopts an AD7866 chip, the DA control circuit adopts an MAX532 chip, the GPS module adopts an NEO-M8N module, and the temperature measuring unit adopts a DS18B20 temperature sensor.
Preferably, in the fourth step, the step of storing data includes setting a block size, obtaining a state of the SD memory, setting a write address, selecting and enabling a device mode, and waiting for completion of card programming, where the first four steps are defined as process 1, the waiting for completion of card programming is defined as process 2, a Write State Flag (WSF) and a write completion flag (WFF) are defined, I and J in structures (I, J) respectively represent values of the WSF and the WFF, where a state (4, 4) represents that a write state flag bit is 4, and a write completion flag bit is 4, and then a data storage flow of an SD double polling write mode triggered by the micro control unit MCU based on a timer is:
4.1 the main program polls the flag bit of the writing state, judges whether to finish the last writing operation, if not finish, it is overtime to explain this writing, return "storage fails" and initialize, the flag bit is cleared to zero; if the operation is finished, the operation is directly initialized, and the flag bit is reset;
4.2, waiting for the data acquisition to be ready, completing encoding, setting the WSF to be 1, and starting to store;
4.3 when the program runs in the main program in an infinite loop mode, the program can continuously enter a timer to be interrupted, namely when the timer runs to a certain number of times, the timer is interrupted and the flag bit is updated to be set to be 1, and then the timer is interrupted; polling whether a flag bit of a write-in state is set every time interrupt is entered, if the flag bit is set, the state is (1, 0) at the moment, and performing 4.4; if the AD acquisition unit is not set, waiting for timer interruption to enter next time, wherein the timer interruption threshold is set as the frequency of the AD acquisition unit;
4.4 writing status flag bit to increase automatically immediately, and performing the operation of procedure 1 of the data block 1; when the process is completed, the write completion flag bit is incremented and the next operation is entered, and the state is (2, 1);
4.5 when the flag bit judges the bit (2, 1), carry on the data block 1 process 2 to write into and poll and write into and finish the flag bit here, judge whether to finish the block to write into, if finish write into finish the flag bit increase by oneself, enter 4.6, the state is (2, 2) at this moment; otherwise, directly jumping out of the interrupt to wait for next polling;
4.6 for the writing process of the data block 2, repeating the operations of the process 1 and the process 2, and completing the writing of the flag bit with the state of (3, 4);
4.7 polling the flag bit, waiting for the above process to be completed completely, and the writing status flag bit is increased, this time the status is (4, 4), so far, the whole writing process is completed, and the process returns to 4.1.
Preferably, the bottom layer logic waiting for the completion of the card programming adopts a polling query flag bit structure, which specifically comprises: in the first polling, the main function serves as a server, and a request for inquiring the zone bit is sent after a time interval of the whole sampling period so as to judge whether the writing process is finished or not; in the second polling, a timer interrupt is used as the server that sends a request to poll the flag bit after a time interval of the sampling period to determine the progress of the storage process and checks the card status to determine if the card programming step is complete.
Compared with the prior art, the invention has the beneficial effects that: the SD double polling writing method based on timer triggering under the multitask frame is adopted, and by adopting a time-sharing processing technology and a polling structure, the SD double polling writing method realizes stable, reliable and high-speed SD storage under the requirement of uninterrupted acquisition of the unmanned aerial vehicle-mounted microwave radiometer, solves the problem of data storage during the continuous acquisition of passive microwave radiometer of the unmanned aerial vehicle, can greatly reduce the time occupied by storage under the condition of not influencing the normal sampling task of the unmanned aerial vehicle-mounted radiometer, ensures the space continuity of ground data, is beneficial to subsequent data processing and image splicing, has good portability, and can be used for improving the data storage efficiency under the multitask frame besides the unmanned aerial vehicle radiometer.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a hardware architecture block diagram of the present invention;
FIG. 3 is a schematic diagram of an SDIO interface of the present invention;
FIG. 4 is a flowchart illustrating the GPS module parsing process of the present invention;
FIG. 5 is a timing diagram of three storage modes under a fast acquisition task;
FIG. 6 is a flow chart of the storage logic of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-6, an embodiment of the present invention is shown: a rapid storage method for passive microwave radiometric measurement of an unmanned aerial vehicle comprises the following steps: step one, building a hardware system; step two, data acquisition; thirdly, preprocessing and coding data; step four, storing data;
in the first step, firstly, a hardware system of the passive microwave radiation measuring device of the unmanned aerial vehicle is set up, the hardware system specifically comprises an antenna, a matched load, a radio frequency switch, a first low noise amplifier, a band-pass filter, a second low noise amplifier, a mixing circuit, an intermediate frequency amplifier, a variable gain amplifier, a square law detector, a video amplifier, an AD sampling unit, a micro control unit MCU, a temperature measuring unit, an SD memory, a DA control circuit and a GPS module, the micro control unit MCU is electrically connected with the AD sampling unit, the DA control circuit, the temperature measuring unit, the SD memory, the GPS module and the radio frequency switch, the radio frequency switch is electrically connected with the antenna, the matched load and the first low noise amplifier, the first low noise amplifier is electrically connected with the band-pass filter, the band-pass filter is electrically connected with the second low noise amplifier, the second low noise amplifier is electrically connected with the mixing circuit, the mixing circuit is electrically connected with a local oscillator and the intermediate frequency amplifier, the intermediate frequency amplifier is electrically connected with the variable gain amplifier, the variable gain amplifier is electrically connected with the DA control circuit, the variable gain amplifier is electrically connected with the square detector, the square law detector is electrically connected with the video amplifier, and the video amplifier is electrically connected with the AD sampling unit; the SD memory is connected with the MCU through a Secure Digital Input and Output (SDIO) interface and adopts a Direct Memory Access (DMA) mode; the MCU adopts an STM32F103ZET6 chip, the AD sampling unit adopts an AD7866 chip, the DA control circuit adopts an MAX532 chip, the GPS module adopts an NEO-M8N module, and the temperature measuring unit adopts a DS18B20 temperature sensor;
wherein in the second step, the method specifically comprises the following steps:
2.1 measuring the brightness and temperature of the target object through an antenna to obtain a brightness and temperature signal of the target object;
2.2 measuring and measuring the temperature of the matched load and each internal device through a temperature measuring unit to obtain temperature signals of the matched load and each internal device;
2.3 acquiring flight attitude information of the unmanned aerial vehicle through a GPS module to acquire a GPS signal, wherein the flight attitude information comprises time, longitude and latitude, high rise, course angle and speed;
wherein in the third step, the method specifically comprises the following steps:
3.1, after the brightness temperature signal of the target object obtained in the step 2.1 is subjected to frequency mixing, amplification, demodulation and AD sampling, the brightness temperature signal is transmitted to a Micro Control Unit (MCU) through an SPI interface, and the Micro Control Unit (MCU) carries out preprocessing and coding;
3.2, transmitting the temperature signals of the matched load and the internal devices acquired in the step 2.2 to a Micro Control Unit (MCU) through an SPI (serial peripheral interface), and preprocessing and coding the temperature signals by the MCU;
3.3, after level conversion is carried out on the GPS signal obtained in the step 2.3, the TTL level is converted into the RS232 standard level, the TTL level is connected with a serial port of a micro control unit MCU for communication, the data format adopts an NMEA0183 protocol, and the micro control unit MCU carries out preprocessing and coding;
in the fourth step, the MCU writes the data preprocessed and encoded in the third step into the SD memory by using a timer-triggered SD double Polling Method (DPSM) to implement data Storage, where the data Storage step includes setting block size, obtaining SD memory state, setting write address, selecting and enabling device mode, and waiting for the card programming to complete, and the bottom logic waiting for the card programming adopts a Polling query flag structure, and specifically: in the first polling, the main function is used as a server, and a request for inquiring the zone bit is sent after a time interval of the whole sampling period so as to judge whether the writing process is finished; in the second polling, a timer interrupt is used as the server, which sends a request to query the flag bit after a time interval of the sampling period to determine the progress of the storage process and checks the card status to determine if the card programming step is complete; defining the first four steps as a process 1, defining a waiting card programming completion process 2, defining a Write State Flag (WSF) and a write completion flag (WFF), wherein I and J in the structure (I, J) respectively represent the values of the WSF and the WFF, here, the state (4, 4) represents that the write state flag bit is 4, and the write completion flag bit is 4, and then the data storage flow of the SD double polling write mode triggered by the micro control unit MCU based on the timer is as follows:
4.1 the main program polls the flag bit of the writing state, judges whether to finish the last writing operation, if not finish, it is overtime to explain this writing, return "storage fails" and initialize, the flag bit is cleared to zero; if the operation is finished, the operation is directly initialized, and the flag bit is reset;
4.2, waiting for the data acquisition to be ready, completing encoding, setting the WSF to be 1, and starting to store;
4.3 when the program runs in the main program in an infinite loop manner, the program can continuously enter a timer to be interrupted, namely when the timer runs for a certain number of times, the timer is interrupted and the flag bit is updated to be set to be 1, and then the timer is interrupted; polling whether a flag bit of a write-in state is set every time interrupt is entered, if the flag bit is set, the state is (1, 0) at the moment, and performing 4.4; if the AD acquisition unit is not set, waiting for timer interruption to enter next time, wherein the timer interruption threshold is set as the frequency of the AD acquisition unit;
4.4 writing status flag bit to increase automatically immediately, and performing the operation of procedure 1 of the data block 1; when the process is completed, the write completion flag bit is incremented and the next operation is entered, and the state is (2, 1);
4.5 when the flag bit judges the bit (2, 1), carry on the data block 1 process 2 to write into and poll and write into and finish the flag bit here, judge whether to finish the block to write into, if finish write into finish the flag bit increase by oneself, enter 4.6, the state is (2, 2) at this moment; otherwise, directly jumping out of the interrupt to wait for next polling;
4.6 for the writing process of the data block 2, repeating the operations of the process 1 and the process 2, and completing the writing of the flag bit with the state of (3, 4);
4.7 poll flag bit, wait for the above process to complete, write status flag bit is increased, this time status is (4, 4), so far, all write process is complete, return to 4.1.
Using the methods provided in the above embodiments, experimental comparisons were made with Storage in the Main program (using Main Function Storage Method, MFSM) and Storage in higher priority interrupts (using Interrupt Triggered Storage Method, ITSM), respectively, with the following results:
based on the above, the timer-triggered-based SD dual polling writing mode (DPSM) provided by the present invention adopts a time-sharing processing technique, divides the running time of the processor into short time periods, reasonably arranges the time for the sampling task, the data processing task, the data encoding task and the data storage task, fully utilizes resources, and improves the resource utilization rate; meanwhile, the idea of a polling structure of a web solution is applied to a program, and by means of a DMA (direct memory access) device mode, the MCU of a single core thread is simulated into multiple threads, compared with the storage in a main program and the storage in an interrupt with higher priority, the storage process does not delay the whole sampling period, the total time consumption is reduced by 90-95%, the time consumption of a card programming step is reduced by 93-99%, and the time sequence occupied by the storage is greatly saved; the method is applied to the microwave radiometer of the unmanned aerial vehicle, can ensure that the radiometer performs equally-spaced high-frequency sampling in time as far as possible, and stores the sampled data in real time, thereby ensuring the spatial continuity of ground data and being beneficial to subsequent data processing and image splicing; and the storage method has good portability, and can be used for improving the data storage efficiency under a multi-task framework besides the unmanned aerial vehicle radiometer.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A rapid storage method for passive microwave radiometric measurement of an unmanned aerial vehicle comprises the following steps: step one, building a hardware system; step two, data acquisition; step three, data preprocessing and coding; step four, storing data; the method is characterized in that:
in the first step, firstly, a hardware system of the passive microwave radiation measuring device of the unmanned aerial vehicle is built, wherein the hardware system specifically comprises an antenna, a matched load, a radio frequency switch, a first low noise amplifier, a band-pass filter, a second low noise amplifier, a mixing circuit, an intermediate frequency amplifier, a variable gain amplifier, a square law detector, a video amplifier, an AD sampling unit, a micro control unit MCU, a temperature measuring unit, an SD memory, a DA control circuit and a GPS module.
Wherein in the second step, the method specifically comprises the following steps:
2.1 measuring the brightness temperature of the target object through an antenna to obtain a brightness temperature signal of the target object;
2.2 measuring and measuring the temperature of the matched load and each internal device through a temperature measuring unit to obtain temperature signals of the matched load and each internal device;
2.3 acquiring flight attitude information of the unmanned aerial vehicle through a GPS module to acquire a GPS signal, wherein the flight attitude information comprises time, longitude and latitude, high rise, course angle and speed;
wherein in the third step, the method specifically comprises the following steps:
3.1, after the brightness temperature signal of the target object obtained in the step 2.1 is subjected to frequency mixing, amplification, demodulation and AD sampling, transmitting the signal to a micro control unit MCU through an SPI interface, and preprocessing and coding the signal by the micro control unit MCU;
3.2, transmitting the temperature signals of the matched load and the internal devices acquired in the step 2.2 to a Micro Control Unit (MCU) through an SPI (serial peripheral interface), and preprocessing and coding the temperature signals by the MCU;
3.3, after level conversion is carried out on the GPS signal obtained in the step 2.3, the TTL level is converted into the RS232 standard level, the TTL level is connected with a serial port of a micro control unit MCU for communication, the data format adopts an NMEA0183 protocol, and the micro control unit MCU carries out preprocessing and coding;
in the fourth step, the MCU writes the data preprocessed and encoded in the third step into the SD memory by using a timer-triggered SD double Polling Method (DPSM) to implement data Storage.
2. The fast storage method of passive microwave radiometry of unmanned aerial vehicle of claim 1, characterized in that: in the first step, the micro control unit MCU is electrically connected with an AD sampling unit, a DA control circuit, a temperature measuring unit, an SD memory, a GPS module and a radio frequency switch, the radio frequency switch is electrically connected with an antenna, a matched load and a first low noise amplifier, the first low noise amplifier is electrically connected with a band pass filter, the band pass filter is electrically connected with a second low noise amplifier, the second low noise amplifier is electrically connected with a mixing circuit, the mixing circuit is electrically connected with a local oscillator and an intermediate frequency amplifier, the intermediate frequency amplifier is electrically connected with a variable gain amplifier, the variable gain amplifier is electrically connected with the DA control circuit, the variable gain amplifier is electrically connected with a square law detector, the square law detector is electrically connected with a video amplifier, and the video amplifier is electrically connected with the AD sampling unit.
3. The fast storage method of passive microwave radiometry of unmanned aerial vehicle of claim 2, characterized in that: the SD memory is connected with the MCU through a Secure Digital Input and Output (SDIO) interface and adopts a Direct Memory Access (DMA) mode.
4. The fast storage method of passive microwave radiometry of unmanned aerial vehicle of claim 2, characterized in that: the MCU adopts an STM32F103ZET6 chip, the AD sampling unit adopts an AD7866 chip, the DA control circuit adopts an MAX532 chip, the GPS module adopts an NEO-M8N module, and the temperature measuring unit adopts a DS18B20 temperature sensor.
5. The fast storage method of passive microwave radiometry of unmanned aerial vehicle of claim 1, characterized in that: in the fourth step, the step of data storage includes setting a block size, obtaining an SD memory state, setting a write address, selecting and enabling a device mode, and waiting for completion of card programming, the first four steps are defined as a process 1, the waiting card programming completion is defined as a process 2, a Write State Flag (WSF) and a write completion flag (WFF) are defined, I and J in structures (I, J) respectively represent values of the WSF and the WFF, where a state (4, 4) represents that a write state flag bit is 4, and the write completion flag bit is 4, then a data storage flow of an SD double polling write mode triggered by a micro control unit MCU based on a timer is as follows:
4.1 the main program polls the flag bit of the writing state, judges whether to finish the last writing operation, if not finish, it is overtime to explain this writing, return "storage fails" and initialize, the flag bit is cleared to zero; if the operation is finished, the operation is directly initialized, and the flag bit is reset;
4.2, waiting for the data acquisition to be ready, completing encoding, setting the WSF to be 1, and starting to store;
4.3 when the program runs in the main program in an infinite loop manner, the program can continuously enter a timer to be interrupted, namely when the timer runs for a certain number of times, the timer is interrupted and the flag bit is updated to be set to be 1, and then the timer is interrupted; polling whether a flag bit of a write-in state is set every time interrupt is entered, if the flag bit is set, the state is (1, 0) at the moment, and performing 4.4; if the AD acquisition unit is not set, waiting for timer interruption to enter next time, wherein the timer interruption threshold is set as the frequency of the AD acquisition unit;
4.4 the writing status flag bit is automatically increased immediately, and the operation of the process 1 of the data block 1 is carried out; when the process is completed, the write completion flag bit is incremented and the next operation is entered, and the state is (2, 1);
4.5 when the flag bit judges the bit (2, 1), carry on the data block 1 process 2 to write into and poll and write into and finish the flag bit here, judge whether to finish the block to write into, if finish write into finish the flag bit increase by oneself, enter 4.6, the state is (2, 2) at this moment; otherwise, directly jumping out of the interrupt to wait for next polling;
4.6 for the writing process of the data block 2, repeating the operations of the process 1 and the process 2, and completing the writing of the flag bit with the state of (3, 4);
4.7 poll flag bit, wait for the above process to complete, write status flag bit is increased, this time status is (4, 4), so far, all write process is complete, return to 4.1.
6. The fast storage method of passive microwave radiometric of unmanned aerial vehicle of claim 5, characterized in that: the bottom layer logic waiting for the completion of the card programming adopts a polling inquiry zone bit structure, and specifically comprises the following steps: in the first polling, the main function serves as a server, and a request for inquiring the zone bit is sent after a time interval of the whole sampling period so as to judge whether the writing process is finished or not; in the second polling, a timer interrupt is used as the server that sends a request to poll the flag bit after a time interval of the sampling period to determine the progress of the storage process and checks the card status to determine if the card programming step is complete.
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| CN116577832A (en) * | 2023-05-12 | 2023-08-11 | 中国科学院东北地理与农业生态研究所 | High-resolution lake ice detection method based on unmanned aerial vehicle-mounted microwave radiation observation system |
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| CN116577832A (en) * | 2023-05-12 | 2023-08-11 | 中国科学院东北地理与农业生态研究所 | High-resolution lake ice detection method based on unmanned aerial vehicle-mounted microwave radiation observation system |
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