CN112380173B - Intelligent correction rapid PCM decoding calculation method - Google Patents
Intelligent correction rapid PCM decoding calculation method Download PDFInfo
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Abstract
The invention belongs to the field of helicopter flight tests, and discloses an intelligent correction rapid PCM decoding calculation method. According to the PCM data principle, the frame structure of PCM data is determined by a user, and is stored in a DataFlow in an XLG file, including a word length, a subframe length, a main frame length, a sync word value, and a position of a frame corresponding to each data word, so that normal PCM decoding is performed. Currently, in order to accelerate decoding speed, an original code file is divided into a plurality of blocks according to the number of blocks input by a user; starting a plurality of threads, decoding each block, and storing the result to a hard disk; and after all the blocks are decoded and corrected, combining decoding results of all the blocks, and finishing decoding.
Description
Technical Field
The invention belongs to the field of helicopter flight tests, and particularly relates to an intelligent correction rapid PCM decoding calculation method.
Background
The method is characterized in that a data acquisition device fills data into the data frames according to a defined frame format, the data recording device records the data frames and stores the data frames on a storage device, finally, the stored PCM data information is imported into a computer and extracted into engineering physical quantity, which is commonly called PCM decoding, along with development of scientific research models, test data are bigger and bigger, test environment is more and more complex, decoding speed is slower, original data doped with various interference data are expected to be more and more in the decoding process, and in order to ensure accuracy and completeness of converted data information and ensure efficiency of test flight data decoding, a set of algorithms with strict standard inspection, correction and multi-thread decoding are designed based on the problems, so that the PCM decoding rate is improved, and interference signals in the data are corrected.
At present, the test flight data decoding has no intelligent algorithm, a traditional tool is required to be manually operated to position and intercept interference in the PCM data, the required time is long, the accuracy is insufficient, and the interference is easily ignored in many cases, so that the later data analysis difficulty is increased, the test flight efficiency is even seriously influenced, and the test flight risk is increased.
Therefore, the intelligent correction quick PCM decoding calculation method has important significance for helicopter test flight.
Disclosure of Invention
In order to solve the above problems, the present invention determines the frame structure of PCM data according to the PCM data principle, and stores the frame structure of PCM data in the DataFlow stored in the XLG file, including word length, subframe length, main frame length, sync word value, and the position of the frame corresponding to each data word, thereby performing normal PCM decoding.
Currently, in order to accelerate decoding speed, an original code file is divided into a plurality of blocks according to the number of blocks input by a user; starting a plurality of threads, decoding each block, and storing the result to a hard disk; and after all the blocks are decoded and corrected, combining decoding results of all the blocks, and finishing decoding.
The specific technical scheme is as follows:
an intelligent modified rapid PCM decoding calculation method comprises the following steps:
the first step: partitioning PCM original data;
and a second step of: reading a decoding configuration file of the PCM original data, numbering subframes of the PCM original data, and if a parameter named as time is configured in the decoding configuration file, decoding the parameter;
and a third step of: the PCM original data after numbering the sub-frames is continuously analyzed and the frames are complemented,
fourth step: decoding the PCM frame data after the frame supplement;
fifth step: and (5) saving the decoding result.
Further, in the first step, the block data size f=2×2 (N-1) +m/Q, where the frame length is N bytes, the data size is M bytes, and the number of the divided blocks is Q;
further, in the third step, the decoding parameter has no "time" parameter, and the continuity judgment is performed only according to the subframe number; the decoding parameter includes a "time" parameter, and the continuity determination is performed based on the subframe number and the time value.
Further, in the third step, the PCM original data continuity judgment result after the subframe numbering includes: front discontinuity data, middle discontinuity data, and tail discontinuity data.
Further, the continuity of the PCM original data is judged according to the following method;
all subframes before the first complete main frame is detected are front discontinuous data;
all subframes after the last complete main frame is detected are tail discontinuous data;
all subframes between the complete main frames are middle discontinuous data.
Further, if the decoding parameter has no time parameter;
for the data with discontinuous front part and discontinuous tail part, only the subframe number is corrected, and no frame compensation is performed;
for the middle discontinuous data, the following steps are carried out:
step a), increasing according to the subframe number, and correcting discontinuous subframe numbers;
if the number positions of the discontinuous subframes are not included in the middle, the number of the subframes at the discontinuous positions is not modified;
if the position of the discontinuous subframe number is included in the middle, one or more subframes are included in the middle, the subframe number of the discontinuous section is corrected according to the continuity of the subframe number;
step b) judging whether the corrected subframe numbers are continuous or not, and if not, supplementing frames;
if the corrected subframe numbers are continuous, no frame supplementing is needed;
if the corrected subframe number is discontinuous and the front subframe number is smaller than the rear subframe number, supplementing the frame data with the same frame as the front frame and supplementing the data into a complete main frame;
if the corrected sub-frame number is discontinuous and the previous sub-frame number is greater than the subsequent sub-frame number, the frame supplementing data is the same as the subsequent frame and the data is supplemented into two complete main frames.
Further, if the decoding parameter includes a "time" parameter, the data with continuous subframe number and time are used as continuous data;
for the discontinuous data of the front part and the tail part, modifying the subframe number and the time into continuous non-data without frame supplementing;
for data with discontinuous middle part, the following steps are carried out:
step c), increasing according to the time and the subframe number, and correcting the time and the subframe number of the discontinuous section;
if the position of the discontinuous subframe number does not contain any subframe, the time data and the subframe number at the discontinuous position are not modified;
if the position of the discontinuous subframe number comprises one or more subframes, carrying out continuity correction on the time of the discontinuous section and the subframe number;
step d) judging whether the modified subframe numbers are continuous or not, if not, supplementing frames;
if the corrected subframe numbers are continuous, the frame supplementing is not carried out;
if the subframe numbers are discontinuous and the front subframe number is smaller than the rear subframe number; then the frame is complemented between the two sub-frame numbers, the frame complementing data is the same as the previous frame, the number of main frames needing to be complemented is determined according to the missing time length, and the time continuity is not considered after the frame complementing;
if the subframe numbers are discontinuous and the previous subframe number is greater than or equal to the subsequent subframe number; and carrying out frame supplementing between two subframe numbers, wherein the frame supplementing is the same as the following frame, and determining the number of main frames needing to be supplemented according to the missing time length, and the time continuity is not considered after frame supplementing.
Further, in the fourth step, the data after the frame supplement is read, the file type is judged by searching the frame identification method, and the size of the data read each time is 200 kbytes;
and judging the file type and then decoding.
Advantageous effects
Compared with the existing decoding system at present, the method has the following characteristics:
1) The method is efficient, a specific blocking method is provided for the end of multi-thread decoding, and the data security is ensured while the efficiency is ensured.
2) In order to solve the problem of data interference, the method provides a data analysis method, rapidly locates interference data, and provides an effective means for correction so as to ensure normal data decoding;
the method can be applied to scientific research test flight tests of various civil and military helicopters or gyroplanes, has the conditions of further popularization and application, and has strong benefit sustainability.
Drawings
FIG. 1 is a block diagram of an original data file;
FIG. 2 is a flow chart of decoding of each block file;
fig. 3 is a schematic diagram of continuity judgment and frame filling.
Detailed Description
An intelligent modified rapid PCM decoding calculation method comprises the following steps:
in order to ensure that the multi-thread can be solved, the data is required to be segmented, a plurality of processes are formed in the program, and in order to ensure that the frame is not lost and the data is most effective at the segmentation position, the size of the segmented data is F=2 (N-1) +M/Q according to the number of the segmented data, wherein the frame length is N bytes, the data size is M bytes, and the number of the segmented data is Q.
The block schematic is shown in fig. 1, wherein S1, S2, … … represent the start of each block; e1, E2, … … represent the end of each chunk. Where S1 to E1 represent the first partition, S2 to E2 represent the second partition, the following partitions and so on.
Reads the configuration file of the original PCM data. The method comprises the steps of reading the name of each channel, the sampling rate of the channel, the subframe where the channel data are located, the offset position in the subframe and the like. A PCM stream is selected. In the configuration file, a plurality of PCM streams may be defined, and one stream may be selected for decoding before decoding. The decoding configuration file is read. And reading the decoding information of the input channel and outputting the parameter synthesis information. And analyzing the output parameters contained in each frame and the position information of the input channel of each output parameter so as to reduce the cyclic searching during decoding and improve the decoding efficiency. According to the attribute of the < SFID > node in the configuration file, the subframe number is decoded, and the subframe contained in a complete cycle number of the < SFID > node forms a main frame. If a parameter named "time" is configured in the output parameter, the parameter is decoded. The decoding process is shown in fig. 2.
There are two situations for the continuity analysis. Firstly, the decoding parameters have no time parameter, and the continuity judgment and frame supplementing are carried out only according to the subframe number; second, the decoding parameters include a "time" parameter, and the continuity determination and frame compensation are performed according to the subframe number and the time value. The process of continuity analysis and frame replenishment is shown in fig. 3 below. Wherein the front discontinuous data refers to all sub-frame data before the first complete main frame is checked, the middle discontinuous data refers to all sub-frame data between the complete main frames, and the tail discontinuous data refers to all sub-frame data after the last complete main frame.
1. Without the time parameter, the analysis and processing is performed based solely on the subframe number. And according to the subframe number, finding out continuous data segments. The subframe numbers are consecutive, i.e. consecutive data segments. .
a) Front discrete section processing
The data of the front discontinuous section is directly subjected to the sub-frame number correction. No frame padding is performed, i.e. the number of frames is not modified. The correction effect is as follows:
number of sub-frame before correction: 1. 3, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16;
number of corrected subframe: 4. 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
b) Middle discontinuous section treatment
Middle discontinuous section treatment comprising two steps:
firstly, according to the increment of the subframe number, the subframe number of a discontinuous section is corrected;
the position of the discontinuous subframe number, without any subframe in the middle, will not modify the subframe number at the discontinuity.
In the second case, the position of the discontinuous subframe number is included in the middle of one or more subframes, and the subframe number of the discontinuous segment is corrected according to the continuity of the subframe number. The correction effect is as follows:
number of sub-frame before correction: 1. 2, 3, 4, 5, 7, 8, 11, 12, 13, 14, 15, 16;
number of corrected subframe: 1. 2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15, 16.
Secondly, judging whether the corrected subframe number is continuous or not, if not, supplementing the frame
In this case, the frame number is changed continuously after the correction of the subframe, and the frame is not required to be complemented after the correction.
After the subframe correction, the subframe numbers are discontinuous, and the front subframe number is smaller than the rear subframe number, which indicates that the frame loss occurs. For this case, the frame is supplemented by continuing the previous value, supplementing the data to a complete main frame. The frame-filling effect is as follows:
number of corrected subframe: 1. 2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15, 16;
subframe number after frame filling: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
After the subframe correction, the subframe number is not continuous, and the previous subframe number is equal to or larger than the subsequent subframe number, which indicates that a frame loss occurs, and that the lost data involves two or more main frames. And the continuous front value compensation frame is needed to be carried out, the data is supplemented into a complete main frame, and the integrity of the two related main frames is ensured. The frame-filling effect is as follows:
number of corrected subframe: 1. 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 6;
subframe number after frame filling: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 1, 2, 3, 4, 5, 6.
c) And (5) processing the tail discontinuous section, and directly correcting the subframe number. No frame padding is performed, i.e. the number of frames is not modified. The correction effect is as follows:
number of sub-frame before correction: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16;
number of corrected subframe: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.
2. And when the time parameter is included, carrying out continuity judgment according to the time and the subframe number.
a) Finding consecutive data segments
And according to the subframe number and the time, finding out continuous data segments. Only the data with continuous subframe number and time is used as continuous data segment.
b) Front discontinuous data processing
The data of the front discontinuous section is directly corrected for the subframe number and time, and the subframe number and time are corrected to continuous data. No frame filling is performed. The correction effect is as follows
Number of sub-frame before correction: 1. 3, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16;
correcting the time of the previous subframe: 2s, 4s, 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s;
number of corrected subframe: 6. 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.
Corrected subframe time: 6s, 7s, 8s, 9s, 10s, 11s, 12s, 13s, 14s, 15s, 16s;
c) Middle discontinuous data processing
Step one, according to the time and subframe number increment, the time and subframe number of the discontinuous section are corrected;
the intermediate does not contain any subframes for which case the time data and subframe number at the discontinuity are not modified.
The middle part includes one or a plurality of subframes, and the time of the discontinuous section and the subframe number are subjected to continuity correction. The frame-supplementing effect is as follows
Number of sub-frame before correction: 7. 8, 9, 11, 12, 16, 10, 11, 12, 13, 14, 15, 16;
correcting the time of the previous subframe: 7s, 8s, 9s, 10s, 29s, 41s, 42s, 43s, 44s, 45s, 46s, 47s;
number of corrected subframe: 7. 8, 9, 10, 11, 12, 13, 14, 15, 16;
corrected subframe time: 7s, 8s, 9s, 10s, 41s, 42s, 43s, 44s, 45s, 46s, 47s.
And secondly, judging whether the corrected subframe numbers are continuous or not, and if not, supplementing the frames.
After the processing, the subframe number is continued, and after correction, no frame addition is necessary.
After the processing, the frame number is discontinuous, and the preceding frame number is smaller than the following frame number, which means that frame loss occurs, and frame replenishment is necessary. The frame supplementing aims at guaranteeing the integrity of the main frame, the frame supplementing is carried out between two subframe numbers, and the frame supplementing data are the same as the previous frame. After the frame is complemented, the time continuity is not considered.
After processing, the subframe numbers are discontinuous, and the previous subframe number is greater than or equal to the subsequent subframe number, which means that the frame loss occurs at least between two main frames, and a frame compensation is required. The frame complement aims at guaranteeing the integrity of the main frame, and the frame complement is carried out between two subframe numbers, and the frame complement is the same as the following frame. After the frame is complemented, the time continuity is not considered. The frame-supplementing effect is as follows
Number of corrected subframe: 7. 8, 9, 10, 11, 12, 13, 14, 15, 16;
corrected subframe time: 7s, 8s, 9s, 10s, 41s, 42s, 43s, 44s, 45s, 46s, 47s.
Subframe number after frame filling: 7. 8, 9, 10, … …, 16, 1 … …, 16, 1, … … 8, 9, 10, 11, 12, 13, 14, 15, 16;
subframe time after frame filling: 7s, 8s, 9s, 10s … … s, 17s … … s, 33s … … 40, 41s, 42s, 43s, 44s, 45s, 46s, 47s.
d) Tail discontinuous data processing
And directly correcting the continuity of the time and the subframe number by the data of the tail discontinuous section. No frame filling is performed.
Number of sub-frame before correction: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 16;
correcting the time of the previous subframe: 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 11s, 13s, 15s;
number of corrected subframe: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11;
corrected subframe time: 1s, 2s, 3s, 4s, 5s, 6s, 7s, 8s, 9s, 10s, 11s.
Frame data is acquired. The frame data refers to data of one subframe, and the acquisition process is as follows: reading 200KByte data, and judging the file type by searching for a frame identifier; reading all data, and processing the data according to the file type obtained in the previous step; searching for frame identification and storing source code data of each frame. And when each frame is decoded, each output parameter contained in the current frame is circularly decoded, and the decoding result is stored in a variable associated with the output parameter.
And combining decoding results. And after all the blocks are decoded, merging decoding results. The format of the decoding result file and the format of the description file are consistent with the format of each block result. When the combination is performed, the sequence numbers are renumbered.
Claims (8)
1. An intelligent modified rapid PCM decoding calculation method is characterized in that: the method comprises the following steps:
the first step: partitioning PCM original data;
and a second step of: reading a decoding configuration file of the PCM original data, and numbering subframes of the PCM original data;
if the decoding configuration file is configured with a parameter named as time, decoding the parameter;
and a third step of: carrying out continuity analysis on PCM original data after sub-frame numbering according to the sub-frame numbering or sub-frame numbering and decoded time parameters, judging whether data segments are continuous according to the data of the front part, the middle part and the tail part, correcting the sub-frame numbering according to the continuity condition of the data segments, judging whether frame supplementing is needed according to the corrected sub-frame numbering condition, and carrying out frame supplementing on the data segments needing frame supplementing;
fourth step: and decoding the PCM frame data after the frame supplement.
2. The intelligent modified fast PCM decoding calculation method according to claim 1, wherein: in the first step, the block data size f=2× (N-1) +m/Q, where the frame length is N bytes, the data size is M bytes, and the number of blocks is Q.
3. The intelligent modified fast PCM decoding calculation method according to claim 2, wherein: in the third step, if the decoding configuration file has no time parameter, carrying out continuity judgment according to the subframe number; if the decoding configuration file contains a time parameter, the continuity judgment is carried out according to the subframe number and the time value.
4. The intelligent modified fast PCM decoding calculation method according to claim 3, wherein: in the third step, the PCM original data continuity judgment result after the subframe numbering includes: front discontinuity data, middle discontinuity data, and tail discontinuity data.
5. The intelligent modified fast PCM decoding calculation method according to claim 4, wherein: judging the continuity of the PCM original data according to the following method;
all subframes before the first complete main frame is detected are front discontinuous data;
all subframes after the last complete main frame is detected are tail discontinuous data;
all subframes between the complete main frames are middle discontinuous data.
6. The intelligent modified fast PCM decoding calculation method according to claim 5, wherein: if the decoding configuration file has no time parameter;
for the data with discontinuous front part and discontinuous tail part, carrying out sub-frame number correction without frame compensation;
for the middle discontinuous data, the following steps are carried out:
step a), increasing according to the subframe number, and correcting discontinuous subframe numbers;
if the position of the discontinuous subframe number does not contain any subframe, the subframe number at the discontinuous position is not modified;
if the position of the discontinuous subframe number comprises one or more subframes, correcting the subframe number of the discontinuous section according to the continuity of the subframe number;
step b) judging whether the corrected subframe numbers are continuous or not, and if not, supplementing frames;
if the corrected subframe numbers are continuous, no frame supplementing is needed;
if the corrected subframe number is discontinuous and the front subframe number is smaller than the rear subframe number, supplementing the frame data with the same frame as the front frame and supplementing the data into a complete main frame;
if the corrected sub-frame number is discontinuous and the previous sub-frame number is greater than the subsequent sub-frame number, the frame supplementing data is the same as the subsequent frame and the data is supplemented into two complete main frames.
7. The intelligent modified fast PCM decoding calculation method according to claim 6, wherein: if the decoding configuration file contains a time parameter, the data with continuous subframe numbers and time are used as continuous data;
for the discontinuous data of the front part and the tail part, modifying the subframe number and the time into continuous data without frame supplementing;
for data with discontinuous middle part, the following steps are carried out:
step c), increasing according to the time and the subframe number, and correcting the time and the subframe number of the discontinuous section;
if the position of the discontinuous subframe number does not contain any subframe, the time data and the subframe number at the discontinuous position are not modified;
if the position of the discontinuous subframe number comprises one or more subframes, carrying out continuity correction on the time of the discontinuous section and the subframe number;
step d) judging whether the modified subframe numbers are continuous or not, if not, supplementing frames;
if the corrected subframe numbers are continuous, the frame supplementing is not carried out;
if the subframe numbers are discontinuous and the front subframe number is smaller than the rear subframe number; then the frame is complemented between the two sub-frame numbers, the frame complementing data is the same as the previous frame, the number of main frames needing to be complemented is determined according to the missing time length, and the time continuity is not considered after the frame complementing;
if the subframe numbers are discontinuous and the previous subframe number is greater than or equal to the subsequent subframe number; and carrying out frame supplementing between two subframe numbers, wherein the frame supplementing is the same as the following frame, and determining the number of main frames needing to be supplemented according to the missing time length, and the time continuity is not considered after frame supplementing.
8. The intelligent modified fast PCM decoding calculation method according to claim 7, wherein: in the fourth step, reading the data after frame supplementing, and judging the file type by searching the frame identification method, wherein the size of the data read each time is 200Kb;
and judging the file type and then decoding.
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