CN113971412A - Error correction method based on RFID (radio frequency identification device) middle and long distance running timing system - Google Patents
Error correction method based on RFID (radio frequency identification device) middle and long distance running timing system Download PDFInfo
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- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10029—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the time domain, e.g. using binary tree search or RFID responses allocated to a random time slot
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10108—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. interrogating only those RFIDs that fulfill a predetermined requirement, e.g. selecting all RFIDs having the same speed and moving in a cloud like fashion, e.g. on the same train; interrogating only RFIDs having a certain predetermined temperature, e.g. in the same fridge, another possibility being the active ignoring of a group of tags that fulfill a predetermined requirement, equivalent to the Boolean NOT operation
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Abstract
The invention discloses an error correction method based on an RFID (radio frequency identification) middle and long distance running timing system, which comprises the following steps: optimizing an algorithm; preprocessing a timing result; averaging the read data; adjustment of read data selection; direct correction of collision errors. The method of the invention directly relates to the accuracy of the final result in the RFID system, and the RFID system can achieve higher recognition rate and accuracy by correcting the anti-collision algorithm, thereby having important significance for the standard-reaching examination and daily training of the organization body.
Description
Technical Field
The invention relates to a middle and long distance running timing technology, in particular to an error correction method based on an RFID (radio frequency identification) middle and long distance running timing system.
Background
At present, there are two main schemes for timing and lap counting based on the RFID technology: the first method comprises the following steps: the small antenna technology is adopted, the small antenna is small in power and coverage area, the distance is usually about 20-40 cm, and in practical use, a plurality of small antennas are connected left and right and back and forth to form a carpet type antenna with larger coverage area. The antennas are interconnected to form a "carpet" having a length of 3-7 meters and a width of about 50 centimeters, and when in use, the carpet looks like when placed on the ground, and is generally called a carpet antenna. The cost of the antenna is high, and is mostly between 8000-. The second type is a large antenna, which means that the power of a single antenna is large, the coverage area is wide, and the radiation range can be as long as 3-7 meters (the radiation power can be adjusted, and the distance can be correspondingly adjusted). The cost of the large antenna is low, and is mostly below 800.
The single reading period of the RFID reader-writer is 50-70 ms, wherein the single reading period comprises 30-50 ms of time for charging the inductor (the time is adjustable), and 20ms of time for reading the data of the inductor. This requires that the time for the student to carry the sensor (i.e., RFID tag) within the reading range of an antenna must be greater than 70ms as the student passes the antenna.
Since the rf coverage of a single "large antenna" can be as small as 3m, at the speed of a hundred meter excellent trainee (about 100m/10s) taking into account the maximum stride (about 1 m/step) and the fastest stride frequency (about 4.6 steps/s) of an excellent trainee. Considering that the height of the student is between 150 and 155 centimeters, the height of the RFID electronic tag is between 110 and 155 centimeters, and the time of the student with the sensor in the radio frequency coverage range of a certain antenna is between 300 and 380ms, which is far more than 70ms, so that the requirements of charging the sensor and reading data can be completely met.
A third party: the test results show that the RFID recognition rate is 100% when a single 'large antenna' is used. This is also well documented (see "certification material-proof of evaluation-third party test reports" and "certification material-proof of representative results-design and implementation of a midrange running timing system employing RFID").
The advantages and disadvantages of the "large antenna" and the "small antenna", respectively, are shown in table 1:
TABLE 1 advantages and disadvantages of "big antenna" and "Small antenna
The electronic tags carried by the students while running are all at the same frequency, so that when a plurality of students enter the range of the reader-writer at the same time, mutual interference (namely collision) occurs.
Disclosure of Invention
The invention mainly aims to provide an error correction method based on an RFID (radio frequency identification) middle-distance running exercise timing system.
The technical scheme adopted by the invention is as follows: an error correction method based on an RFID (radio frequency identification) middle-distance running exercise timing system comprises the following steps: optimizing an algorithm; preprocessing a timing result; averaging the read data; adjustment of read data selection;
direct correction of collision errors.
Further, the timing result preprocessing comprises: optimizing the program, and adding a preprocessing module to reduce errors; firstly, adding a pretreatment part into a conventional running parameter configuration interface of a middle-distance running test program; after the antenna is erected and before the system is used, a stopwatch and the system are used for simultaneously carrying out a single-turn test, data are compared after the test, the difference value between the system and the true value is input into a preprocessing window, and when the test is carried out again, the module can make up the difference value to achieve the purpose of error correction.
Further, the averaging process of the read data includes: analyzing the identification range with the radius of 25m, wherein the standard track and field runway has 6-8 tracks according to relevant regulations, and the width of each track is 1.22-1.25 m; assuming 8 runways, in order to ensure that each runway can receive wireless signals, the coverage radius of each runway is 10 m; assuming that the radius OE =10M, DE =0.1M, OF = 1.14M; when OE =15M, DE =0.1M, OF = 1.72M; when OE =20m, DE =0.1m, OF =1.99 m; OE =30M, DE =0.1M, OF = 2.44M; bound by a 2m range, OE =25 m; within the reader's reading range, the distance traveled in 0.1 seconds is 1 meter, assuming the tester is moving at an average speed of 100 meters in 10 seconds; for a 0.1s scanning cycle of the card reader, the initial acquisition point of the card number can be any position 1m before the finish line; the method of averaging all the time of a single electronic tag in the reading range of the reader is adopted to eliminate errors and ensure that two persons passing through the reader at the same time keep consistent in time as much as possible; firstly, setting a buffer array for a plurality of reading times when each electronic tag passes through a reader, creating a DateTimes [ ] attribute in the originally created RFID-Info in order to record the reading time, wherein the DateTimes [ ] attribute is used as an array capable of storing a plurality of time types, and when the electronic tag passes through the antenna reading range, the reading time when the reading thread is triggered can be recorded in the array so as to facilitate subsequent data processing; establishing a new function for averaging all the time in the attribute, firstly converting all the values in the buffer array into INT type, averaging all the values, converting the averaged values into DATETIME type, and returning the DATETIME type; and after the averaging processing, taking the result as the final result of the circle, clearing the array and waiting for the next round of operation.
Still further, the adjusting of the read data selection comprises: finding out the difference between the last reading time and the passing end point time in an experimental mode, and correcting the final result; and (4) using the buffer array, and taking the last value in the buffer array of each RFID card as the final result of the circle.
Still further, the direct correction of the collision error includes: when the electronic tags run through the timing area, the average number of times of reading the electronic tags which collide is less than 4 times, and the number of times of reading the electronic tags which do not collide is more than 10 times. And continuously utilizing the buffer array to judge the reading times recorded in each electronic tag array, and judging that the tag is collided if the reading times are less than four times. And finally, counting the number of the labels with collision, and performing error correction by combining the estimated value of the collision error according to different numbers of the collision labels.
The invention has the advantages that: the invention directly relates to the accuracy of the final result in the RFID system, and the RFID system can achieve higher recognition rate and accuracy by correcting the anti-collision algorithm, thereby having important significance for the standard-reaching examination and daily training of the organization.
First, can be used to the sports match and the timing of many students for the automatic accurate timing of institute's sports meeting improves the fairness and the transparency of match.
And secondly, the system can be used for daily training of students at ordinary times, solves the problem that the students lack timing and evaluation during ordinary training, finds out and finds the problems in time through auxiliary analysis decision software, trains with pertinence, improves the training effect, solves the problem that the students lack evaluation and auxiliary analysis decision software during military physical training, and improves the pertinence due to frequent training blindness.
And thirdly, a plurality of cadre students who participate in training and examination at the same time are automatically timed, problems are found in time through auxiliary analysis decision software, the cadre students are trained in a targeted manner, and the cadre students are helped to reach the standard.
And fourthly, the system is used for physical training and examination of troops, and the RFID and the WSN are combined, so that training and competition fields can be freely selected, and the flexibility of training and competition is increased. Through the aid of analysis and decision software, problems are found in time, targeted training is performed, and the warriors are helped to reach the standard.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the information exchange of the present invention;
fig. 2 is a schematic view of the recognition scope of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and 2, an error correction method based on an RFID midrange running exercise timing system includes: optimizing an algorithm; preprocessing a timing result; averaging the read data; adjustment of read data selection; direct correction of collision errors.
Optimization of algorithms
The optimization of the algorithm includes a dynamic binary search algorithm.
Currently, the delay of the collision algorithm is too long. By way of analysis, an excellent collision algorithm should have the following properties:
(1) identifying time: the shorter the reader is, the more tags the reader searches in the range of the reader is, the better the reader is;
(2) energy consumption of the identification process: the less the better. What is important is that the less information the tag sends in the whole searching process, the better;
(3) trustworthiness and integrity: it can be ensured that tags belonging to the range of the reader are 100% correctly identified.
Based on these performance criteria, the binary search algorithm needs to find an average tag, and it takes a long time to identify all tags, thus causing a large error. It is mainly considered that in the binary search algorithm, the serial number of the electronic tag is always transmitted once. However, when the serial number of the tag is long (may reach several to several tens of bytes), a large amount of data must be transmitted, which increases the search time and the error frequency.
In fact, through the analysis of the data flow between the reader and the single electronic tag (as in fig. 1), it can be derived: in the prompt command sent by the reader, the (x-1) — 0 bits contain no additional information of the electronic tag, since these bits are always set to 1 or 0 (in this example, they are both set to 1). As long as they are predetermined, such information cannot be transmitted.
The N x bits of the tag response sequence number contain no additional information for the reader because these bits are known and data.
Therefore, the complementary part (shaded part in the figure) of the transmission sequence number is redundant, and the transmission efficiency of the system can be doubled by designing an algorithm to cut redundant data. The improved method is called Dynamic Binary Search algorithm (Dynamic Binary Search algorithm)
Timing result preprocessing
Experiments show that the reading range of the reader is different every time due to the fact that the antenna is supposed to have deviation every time, so that the difference value between the test result and the actual result is basically fixed, the program can be optimized, the preprocessing module is added, and the error is reduced.
Firstly, a preprocessing part is added into a conventional running parameter configuration interface of a middle-distance running test program.
After the antenna is erected and before the system is used, a stopwatch and the system are used for simultaneously carrying out a single-turn test, data are compared after the test, the difference value between the system and the true value is input into a preprocessing window, and when the test is carried out again, the module can make up the difference value to achieve the purpose of error correction.
The following functions are written:
if ((tiaozheng == 1) && (record.CircleCurrent == record.CircleCount))//
performing an overall time adjustment
{
double a = tsTotal.TotalSeconds;
a = a - XMLHandler.addtime * (-1);
TimeSpan b = TimeSpan.FromMilliseconds(a * 1000);
record.term = b.hours.tostring ("00") + ").
(iii) + minutes. ToString ("00") + "score"
+ b.seconds. ToString ("00") + "seconds"
+ ((b.Milliseconds > 0) 
b.Milliseconds.ToString("000") : "");
tiaozheng = 2;
}
Averaging read data
The following is an end point recognition range when the wireless coverage radius is 25m, as shown in fig. 2.
The identification range with the radius of 25m is analyzed, and according to relevant regulations, the standard track and field runway has 6-8 tracks, and the width of each track is 1.22-1.25 meters.
Assuming 8 runways, the coverage radius should be 10m to ensure that each runway can receive wireless signals. Assuming that the radius OE =10M, DE =0.1M, OF = 1.14M; when OE =15M, DE =0.1M, OF = 1.72M; when OE =20m, DE =0.1m, OF =1.99 m; OE =30M, DE =0.1M, OF = 2.44M. It is more appropriate to define OE =25m bounded by a 2m range.
Within the reader's reading range, the distance traveled in 0.1 seconds is 1 meter, assuming the tester is moving at an average speed of 100 meters in 10 seconds. For a 0.1s scan cycle of the card reader, the initial acquisition point for the card number may be anywhere 1m before the finish line. Therefore, at normal operating speeds, the error range is less than 1m, and timing accuracy of 0.1s can be achieved within the allowable range. However, the accuracy of single time reading cannot be effectively guaranteed, so that the method of averaging all the time of a single electronic tag in the reading range of the reader is adopted to eliminate errors, and two persons passing through the reader at the same time are guaranteed to be consistent in time as much as possible.
Firstly, setting a buffer array for a plurality of reading times when each electronic tag passes through a reader, creating a DateTimes [ ] attribute in the originally created RFID-Info in order to record the reading time, wherein the DateTimes [ ] attribute is used as an array capable of storing a plurality of time types, and when the electronic tag passes through the antenna reading range, the reading time when the reading thread is triggered can be recorded in the array so as to facilitate subsequent data processing.
Establishing a new function for averaging all the time in the attribute, firstly converting all the values in the buffer array into INT type, averaging all the values, converting into DATETIME type, and returning.
And after the averaging processing, taking the result as the final result of the circle, clearing the array and waiting for the next round of operation.
Part of the code is as follows:
/// <summary>
// averaging the read time array
/// </summary>
/// <param name="dateTimes"></param>
/// <param name="i"></param>
/// <returns></returns>
static DateTime Average(DateTime[] dateTimes, int i)
{
int j;
long[] tick = new long[i];
long sum = 0;
for (j = 0; j < i; j++)
{
tick[j] = dateTimes[j].Ticks;
}
for (int k = 0; k < i; k++)
{ sum += tick[k]; }
long averagetick = sum / i;
DateTime averagetime = new DateTime(averagetick);
return averagetime;
}
Adjustment of read data selection
As can be seen from the above experiment: in the whole reading process, a plurality of tags enter the reader at the same time, experimental phenomena in the meter are observed, the error between the first reading time of all the electronic tags is found to be the largest, the tags need to be subjected to complex anti-collision algorithm operation before the first reading is completed, after the operation is completed, the tags can update the reading time according to the filtering time, the error between the electronic tags is reduced at the moment, and the data selection of the midlength running test system is explored below.
Connecting an RFID system, starting a middle and long distance running test system and SAAT-8000 reader-writer management software, starting two programs to read cards, recording display contents by screen recording software through an electronic tag through a card reader, and analyzing frame by frame through video editing software to find that the time in the middle and long distance running test system is the same as the first updating time in the SAAT-8000 reader-writer management software, so that the data in the middle and long distance running test system can be selected as the first read data.
From the above, it can be seen that the data selection of the long-distance running timing system has a large error, and according to experiments, the error between the last readings of each electronic tag is found to be small. In addition, the last reading time is actually read at a position behind the reading range of the card reader, and the position of the recording time is usually behind the finishing line, so that the final reading time is slightly longer than the actual time.
The programming implementation of the method can also utilize the buffer array, and the last value in the buffer array of each RFID card is used as the final achievement of the circle.
Part of the code is as follows:
if (record.CircleCurrent == 6.5F)
{
if (record.Count < 10)
{
record.DateTimes7[record.Count] = nowTime;
record.Count = record.Count + 1;
}
if (record.DateTimes7[9] != DateTime.MinValue)
{
last = record.DateTimes7[9];
}
else
{
for (int j = 0; j < 9; j++)
{
if (record.DateTimes7[j + 1] == DateTime.MinValue)
{
last = record.DateTimes7[j];
}
}
}
}
else
{last = nowTime;}
private DateTime[] dateTimes7 = new DateTime[10];
/// <summary>
// read time array
/// </summary>
public DateTime[] DateTimes7
{
get { return dateTimes7; }
set
{
dateTimes7 = value;
}
}
Direct correction of collision errors
The relation between the collision times and the collision time is obtained through the experiment, the result of the collision can be directly corrected according to the experiment result, the main problem encountered in the correction process is how to judge whether the two electronic tags collide, the experiment result is analyzed frame by frame to finally determine whether the collision and the number of the collision occur, and how to provide an effective and rapid method for rapidly judging the collision in the program is the main problem to be solved.
Through the analysis of the experiment 1 and the subsequent experiments, it is found that the electronic tag which has collided has a significant difference between the final reading times and the reading times of the electronic tags which have not collided, and the difference is used as a basis for judging whether the collision occurs.
The field test shows that the average reading times of the electronic tags which collide are less than 4 times and the reading times of the electronic tags which do not collide are more than 10 times in the process of running through the time-keeping area. And continuously utilizing the buffer array to judge the reading times recorded in each electronic tag array, and judging that the tag is collided if the reading times are less than four times. And finally, counting the number of the labels with collision, and performing error correction by combining the estimated value of the collision error according to different numbers of the collision labels.
Part of the code is as follows:
foreach (DateTime s in record.DateTimes7)
{
if (s == DateTime.MinValue)
{
record.Pz = record.Pz + 1;
}
}
if (record.Pz >=6)
{
long b = last.Ticks;
long c = b + 974 * 1000;
last = new DateTime(c);
}
}
field testing: through the research of the previous chapter, several error correction strategies are preliminarily provided and are realized through the programming of software, the field test of the middle and long distance running test system is carried out in the current chapter, the field running test is carried out to compare with the original program, the final effects of different correction methods are checked and analyzed, the most appropriate correction strategy is finally selected, and the defects are found out through repeated field test and optimized.
On the basis of the above experiment, the middle and long distance running test system after being subjected to several kinds of improvement treatments is tested next.
Experiment 5
Purpose of the experiment: error of a long and medium run timing system after several optimizations
Experimental equipment: RFID card reader, wire hypothesis support, middle and long distance running test system software, notebook computer, electronic tag, ApowerREC, ApowereEDIT, stopwatch
The experimental steps are as follows: 1. several optimized versions of the midrange running test system and the ApowerREC screen recording software are opened.
2. And fixing 1 electronic tag behind the back of a tester.
3. And (4) finishing the card issuing process of the middle and long distance running test system, inputting the test distance of 3000 meters, and testing whether the electronic tag can respond to the card reader.
4. And recording the screen by using screen recording software, simultaneously clicking a start button and a stopwatch timing button to start timing, allowing a tester to pass through a card reading area at a normal speed, and simultaneously recording the score by using a stopwatch.
5. The number of the electronic tags is sequentially increased to 3, 5 and 10 to simulate the situation that a plurality of persons pass through the test system at the same time, the test is repeated, and the statistical data are as follows:
the data preprocessing module is designed, so that the maximum difference of the tested results of each program only needs to be compared, and tests show that when 5 persons pass through the data preprocessing module, the maximum difference of the original program results is 0.95s, the maximum error of the program subjected to the averaging processing is 0.208s, the maximum difference of the program results subjected to the data selection and adjustment processing is 1.4s, the maximum difference of the results subjected to collision correction is 0.454s, when 3 persons pass through the data preprocessing module, the maximum difference of the original program results is 0.34s, the maximum error of the program subjected to the averaging processing is 0.191s, the maximum difference of the program results subjected to the data selection and adjustment processing is 0.846s, and the maximum difference of the results subjected to collision correction is 0.173 s.
Through comparison, errors caused by averaging and collision error correction methods are small, but because the current collision error correction can be only used when two collision occurs and is not widely applied, an averaging processing and data preprocessing module is adopted to minimize the errors.
The invention directly relates to the accuracy of the final result in the RFID system, and the RFID system can achieve higher recognition rate and accuracy by correcting the anti-collision algorithm, thereby having important significance for the standard-reaching examination and daily training of the organization.
First, can be used to the sports match and the timing of many students for the automatic accurate timing of institute's sports meeting improves the fairness and the transparency of match.
And secondly, the system can be used for daily training of students at ordinary times, solves the problem that the students lack timing and evaluation during ordinary training, finds out and finds the problems in time through auxiliary analysis decision software, trains with pertinence, improves the training effect, solves the problem that the students lack evaluation and auxiliary analysis decision software during military physical training, and improves the pertinence due to frequent training blindness.
And thirdly, a plurality of cadre students who participate in training and examination at the same time are automatically timed, problems are found in time through auxiliary analysis decision software, the cadre students are trained in a targeted manner, and the cadre students are helped to reach the standard.
And fourthly, the system is used for physical training and examination of troops, and the RFID and the WSN are combined, so that training and competition fields can be freely selected, and the flexibility of training and competition is increased. Through the aid of analysis and decision software, problems are found in time, targeted training is performed, and the warriors are helped to reach the standard.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. An error correction method for a middle-distance running exercise timing system is characterized by comprising the following steps: optimizing an algorithm; preprocessing a timing result; averaging the read data; adjustment of read data selection; direct correction of collision errors.
2. The error correction method of the middle-distance running exercise timing system according to claim 1, wherein the timing result preprocessing includes: optimizing the program, and adding a preprocessing module to reduce errors; firstly, adding a pretreatment part into a conventional running parameter configuration interface of a middle-distance running test program; after the antenna is erected and before the system is used, a stopwatch and the system are used for simultaneously carrying out a single-turn test, data are compared after the test, the difference value between the system and the true value is input into a preprocessing window, and when the test is carried out again, the module can make up the difference value to achieve the purpose of error correction.
3. The error correction method of a middle-distance running exercise timing system according to claim 1, wherein the averaging process of the read data includes: analyzing the identification range with the radius of 25m, wherein the standard track and field runway has 6-8 tracks according to relevant regulations, and the width of each track is 1.22-1.25 m; assuming 8 runways, in order to ensure that each runway can receive wireless signals, the coverage radius of each runway is 10 m; assuming that the radius OE =10M, DE =0.1M, OF = 1.14M; when OE =15M, DE =0.1M, OF = 1.72M; when OE =20m, DE =0.1m, OF =1.99 m; OE =30M, DE =0.1M, OF = 2.44M; bound by a 2m range, OE =25 m; within the reader's reading range, the distance traveled in 0.1 seconds is 1 meter, assuming the tester is moving at an average speed of 100 meters in 10 seconds; for a 0.1s scanning cycle of the card reader, the initial acquisition point of the card number can be any position 1m before the finish line; the method of averaging all the time of a single electronic tag in the reading range of the reader is adopted to eliminate errors and ensure that two persons passing through the reader at the same time keep consistent in time as much as possible; firstly, setting a buffer array for a plurality of reading times when each electronic tag passes through a reader, creating a DateTimes [ ] attribute in the originally created RFID-Info in order to record the reading time, wherein the DateTimes [ ] attribute is used as an array capable of storing a plurality of time types, and when the electronic tag passes through the antenna reading range, the reading time when a reading thread is triggered can be recorded in the array so as to facilitate subsequent data processing; establishing a new function for averaging all the time in the attribute, firstly converting all the values in the buffer array into INT type, averaging all the values, converting the averaged values into DATETIME type, and returning the DATETIME type; and after the averaging processing, taking the result as the final result of the circle, clearing the array and waiting for the next round of operation.
4. The error correction method of a midrange running exercise timing system according to claim 1, wherein the adjustment of the selection of the read data includes: finding out the difference between the last reading time and the passing end point time in an experimental mode, and correcting the final result;
and (4) using the buffer array, and taking the last value in the buffer array of each RFID card as the final result of the circle.
5. The error correction method of a midrange running exercise timing system according to claim 1, wherein the direct correction of the collision error includes: in the process of running through the timing area, the average reading times of the electronic tags which collide are less than 4 times, and the reading times of the electronic tags which do not collide are more than 10 times; continuously utilizing the buffer array to judge the reading times recorded in each electronic tag array, and judging that a collision tag occurs if the reading times are less than four times; and finally, counting the number of the labels with collision, and performing error correction by combining the estimated value of the collision error according to different numbers of the collision labels.
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