CN111162891A - Telemetry data processing frame synchronization method - Google Patents
Telemetry data processing frame synchronization method Download PDFInfo
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- CN111162891A CN111162891A CN201911370020.7A CN201911370020A CN111162891A CN 111162891 A CN111162891 A CN 111162891A CN 201911370020 A CN201911370020 A CN 201911370020A CN 111162891 A CN111162891 A CN 111162891A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0016—Arrangements for synchronising receiver with transmitter correction of synchronization errors
Abstract
The invention relates to a telemetry data processing frame synchronization method. The method comprises the steps of starting searching, setting a frame synchronization word fault-tolerant mechanism, and searching frame synchronization words in a data stream; when the frame synchronous word is searched, checking is started; and when the frame data passes the checking judgment, entering a locking state and outputting the synchronized frame data. The frame synchronization method fault-tolerant mechanism and the verification of the check state can effectively reduce false synchronization and missing synchronization caused by error codes, judge the out-of-step and detect the bit slip, and protect the locking state from being influenced by the false out-of-step caused by the error codes. The system can carry out quick and accurate synchronous detection and reliable and stable synchronous protection. The frame parameters and the synchronous parameters are flexibly changed and configured, and the method can adapt to various telemetry systems, and enhances the universality of the carried equipment.
Description
Technical Field
The invention relates to the technical field of satellite telemetry data processing, in particular to a telemetry data processing frame synchronization method.
Background
In telemetry data processing, the implementation of frame synchronization is one of the key functions essential in terrestrial reception, mainly the formatting of data streams received from satellites. The frame format includes a frame sync word, and a data region. Frame sync words are inserted at intervals at the transmitting end, and the frame sync words are recognized at the receiving end to identify the start position of each frame, so that the subsequent data analysis processing can be performed. The telemetering and remote control is more and more widely applied, the frame structure is more and more complex, the parameters to be controlled become more, and the frame parameters can be flexibly configured by a frame synchronization strategy of equipment to adapt to different telemetering data.
The performance of the frame synchronization system directly affects the performance of the whole communication system. Synchronization is a prerequisite for correct information transmission. In order to ensure reliable transmission of information, a synchronization system is required to have higher reliability and stability and to be resistant to interference to a certain degree. And frame parameters can be flexibly configured according to the use scene, so that the method is suitable for various task requirements.
In the method for determining frame synchronization in the prior art, a receiving end searches for frame synchronization words in a bit data stream, extracts frame data if the frame synchronization words are matched, and continues to search for the frame synchronization words in the data stream. The telemetry frame data is inevitably interfered by noise to cause intermittent bit errors and code loss, which causes erroneous data and bit slip. When an error occurs in a frame sync word, the sync recognizes the error, and thus loses useful information. If a frame sync word occurs in the data region, incorrect sync information is identified. The identification mode is not only inefficient, but also has no anti-interference capability. And the partial frame synchronization strategy only considers the identification error caused by error code, improves the frame synchronization strategy, but does not consider the bit sliding problem, and the data generates bit sliding, thereby causing frame synchronization lock losing and needing to be captured again to enter a synchronization state, and further causing useful information loss and having poor reliability and stability.
Disclosure of Invention
The invention provides a telemetering data processing frame synchronization method for ensuring stable and reliable transmission of telemetering data and reducing false synchronization and missing synchronization, and provides the following technical scheme:
a telemetry data processing frame synchronization method, comprising the steps of:
step 1: starting searching, setting a frame synchronization word fault-tolerant mechanism, and searching frame synchronization words in a data stream;
step 2: when the frame synchronous word is searched, checking is started;
and step 3: and when the frame data passes the checking judgment, entering a locking state and outputting the synchronized frame data.
Preferably, the step 1 specifically comprises: starting searching, presetting a frame synchronization word pattern and a fault-tolerant bit number, setting a fault-tolerant threshold, wherein the fault-tolerant threshold is the error bit number which allows a frame header synchronization word to appear, comparing received bit data with the preset frame synchronization word according to bits, and judging that the frame synchronization word is correctly matched when the error bit number does not exceed the range of the fault-tolerant threshold;
when the error bit number exceeds the fault tolerance threshold range, the non-frame synchronous word is judged to be incorrectly matched.
Preferably, the step 2 specifically comprises:
when the frame synchronous words are searched, checking is started, the frame quantity required by checking is preset to be a, the frame synchronous words are identified at a position which is a continuous frames from the searched frame synchronous word position, and the frame synchronous words pass the checking;
and when the frame synchronous words are not identified at a frame length which is a frames from the searched frame synchronous word position, judging that the frame synchronous words are false synchronous, and returning to the step 1 to search the frame synchronous words again.
Preferably, the step 3 specifically comprises:
judging bit sliding of the frame synchronization word, presetting a sliding range as x bit data, performing frame synchronization word matching identification in the x bit data range before and after the current position, entering a locking state when the frame synchronization word is identified in the sliding range, and outputting synchronized frame data;
when the frame synchronous word is not identified in the sliding range, judging that the frame synchronous word matching fails, performing second protection on the synchronous state in order to avoid false desynchronization caused by accidental errors, presetting the number of the judged desynchronization frames as b, identifying the frame synchronous word by continuously connecting b frame lengths from the matching failure position of the first frame synchronous word, and returning to the search of the step 1 when the frame synchronous word is identified by continuously connecting b frame lengths; when the frame synchronization word is identified by the continuous b frame lengths, locking is kept, and the synchronized frame data is output.
The invention has the following beneficial effects:
the frame synchronization method fault-tolerant mechanism and the verification of the check state can effectively reduce false synchronization and missing synchronization caused by error codes, judge the out-of-step and detect the bit slip, and protect the locking state from being influenced by the false out-of-step caused by the error codes. The system can carry out quick and accurate synchronous detection and reliable and stable synchronous protection. The frame parameters and the synchronous parameters are flexibly changed and configured, and the method can adapt to various telemetry systems, and enhances the universality of the carried equipment.
The invention is a software program designed based on a LabVIEW platform, hardware coordination is not needed, the graphical program is clear and easy to read, the compiling efficiency is high, time is saved, maintenance is easy, expansion is easy, and integration is easy.
Drawings
FIG. 1 is a flow chart of a telemetry data processing frame synchronization method.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The first embodiment is as follows:
as shown in fig. 1, the present invention provides a telemetry data processing frame synchronization method, comprising the steps of:
step 1: starting searching, setting a frame synchronization word fault-tolerant mechanism, and searching frame synchronization words in a data stream;
the step 1 specifically comprises the following steps: starting searching, presetting a frame synchronization word pattern and a fault-tolerant bit number, setting a fault-tolerant threshold, wherein the fault-tolerant threshold is the error bit number which allows a frame header synchronization word to appear, comparing received bit data with the preset frame synchronization word according to bits, and judging that the frame synchronization word is correctly matched when the error bit number does not exceed the range of the fault-tolerant threshold;
when the error bit number exceeds the fault tolerance threshold range, the non-frame synchronous word is judged to be incorrectly matched.
Step 2: when the frame synchronous word is searched, checking is started;
the step 2 specifically comprises the following steps:
when the frame synchronous words are searched, checking is started, the frame quantity required by checking is preset to be a, the frame synchronous words are identified at a position which is a continuous frames from the searched frame synchronous word position, and the frame synchronous words pass the checking;
and when the frame synchronous words are not identified at a frame length which is a frames from the searched frame synchronous word position, judging that the frame synchronous words are false synchronous, and returning to the step 1 to search the frame synchronous words again.
And step 3: and when the frame data passes the checking judgment, entering a locking state and outputting the synchronized frame data.
The step 3 specifically comprises the following steps:
judging bit sliding of the frame synchronization word, presetting a sliding range as x bit data, performing frame synchronization word matching identification in the x bit data range before and after the current position, entering a locking state when the frame synchronization word is identified in the sliding range, and outputting synchronized frame data;
when the frame synchronous word is not identified in the sliding range, judging that the frame synchronous word matching fails, performing second protection on the synchronous state in order to avoid false desynchronization caused by accidental errors, presetting the number of the judged desynchronization frames as b, identifying the frame synchronous word by continuously connecting b frame lengths from the matching failure position of the first frame synchronous word, and returning to the search of the step 1 when the frame synchronous word is identified by continuously connecting b frame lengths; when the frame synchronization word is identified by the continuous b frame lengths, locking is kept, and the synchronized frame data is output.
And setting a fault-tolerant mechanism aiming at frame synchronization word errors caused by error codes. When the frame synchronization word is judged, a fault tolerance threshold is set, the frame header synchronization word is allowed to have errors, and if the error digit is within the range of the preset threshold, the frame header synchronization word is still judged to be correct.
The second embodiment is as follows:
the data is derived from bit data processed by a satellite receiving system through demodulation bit synchronization and the like, and the determination of the synchronization state, the conversion among three states, the search, the check and the locking are carried out.
The frame parameters comprise frame head synchronization words, frame length and frame synchronization strategy parameters comprise fault-tolerant digits of each state, checking judgment frame numbers, locking judgment frame numbers and sliding detection digit which can be independently configured, and the application of the frame synchronization strategy parameters is properly adjusted according to different frame parameters.
When the system is started, the system is in a searching state, frame synchronous words are searched in the data stream, and when the frame synchronous words are captured, the system is converted into a checking state.
In the checking state, the correct frame synchronous word is identified from the searched frame synchronous word at a plurality of continuous frame lengths, the frame synchronization is determined to be achieved, and then the locking synchronization state is entered. If the check state is not successful (if an error occurs, the check state fails), the check state is judged to be false synchronization, and the search state is returned to continue capturing the frame synchronization word.
After entering the locking state, each frame is still judged, when the frame exceeds the fault-tolerant threshold, a plurality of continuous frames are corrected, if the frames exceed the threshold (all are wrong), the frame is judged to be out of step, but in the range of the allowed frame number, the error frame happens, and the synchronous state is still kept. In the locked state, bit slip detection is also added. It is considered that the signal may be affected by missing data or redundant data in addition to errors during the propagation process to cause bit slip of the frame data. At the same time of judging frame synchronization word, it also can judge that there is bit slip or not.
Searching, checking and locking three states, wherein each state comprises a frame synchronization word fault tolerance mechanism.
The present invention establishes protection of the synchronization state through state transition. The fault-tolerant mechanism and the verification of the check state can effectively reduce false synchronization and missing synchronization caused by error codes. The confirmation judgment of the step-out and the bit sliding judgment also protect the locking state, so that the synchronous state is not influenced by the false step-out and the bit sliding generated by the error code, and the checking needs to be searched again, thereby causing unnecessary data loss. The above ensures that the telemetering data is stably and reliably acquired.
The above description is only a preferred embodiment of the telemetry data processing frame synchronization method, and the protection scope of the telemetry data processing frame synchronization method is not limited to the above embodiments, and all technical solutions belonging to the idea belong to the protection scope of the present invention. It should be noted that modifications and variations which do not depart from the gist of the invention will be those skilled in the art to which the invention pertains and which are intended to be within the scope of the invention.
Claims (4)
1. A telemetry data processing frame synchronization method is characterized in that: the method comprises the following steps:
step 1: starting searching, setting a frame synchronization word fault-tolerant mechanism, and searching frame synchronization words in a data stream;
step 2: when the frame synchronous word is searched, checking is started;
and step 3: and when the frame data passes the checking judgment, entering a locking state and outputting the synchronized frame data.
2. The telemetry data processing frame synchronization method of claim 1, wherein: the step 1 specifically comprises the following steps: starting searching, presetting a frame synchronization word pattern and a fault-tolerant bit number, setting a fault-tolerant threshold, wherein the fault-tolerant threshold is the error bit number which allows a frame header synchronization word to appear, comparing received bit data with the preset frame synchronization word according to bits, and judging that the frame synchronization word is correctly matched when the error bit number does not exceed the range of the fault-tolerant threshold;
when the error bit number exceeds the fault tolerance threshold range, the non-frame synchronous word is judged to be incorrectly matched.
3. The telemetry data processing frame synchronization method of claim 1, wherein: the step 2 specifically comprises the following steps:
when the frame synchronous words are searched, checking is started, the frame quantity required by checking is preset to be a, the frame synchronous words are identified at a position which is a continuous frames from the searched frame synchronous word position, and the frame synchronous words pass the checking;
and when the frame synchronous words are not identified at a frame length which is a frames from the searched frame synchronous word position, judging that the frame synchronous words are false synchronous, and returning to the step 1 to search the frame synchronous words again.
4. The telemetry data processing frame synchronization method of claim 1, wherein: the step 3 specifically comprises the following steps:
judging bit sliding of the frame synchronization word, presetting a sliding range as x bit data, performing frame synchronization word matching identification in the x bit data range before and after the current position, entering a locking state when the frame synchronization word is identified in the sliding range, and outputting synchronized frame data;
when the frame synchronous word is not identified in the sliding range, judging that the frame synchronous word matching fails, performing second protection on the synchronous state in order to avoid false desynchronization caused by accidental errors, presetting the number of the judged desynchronization frames as b, identifying the frame synchronous word by continuously connecting b frame lengths from the matching failure position of the first frame synchronous word, and returning to the search of the step 1 when the frame synchronous word is identified by continuously connecting b frame lengths; when the frame synchronization word is identified by the continuous b frame lengths, locking is kept, and the synchronized frame data is output.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112532371A (en) * | 2020-11-30 | 2021-03-19 | 东方红卫星移动通信有限公司 | Parallel frame synchronization method, sending end, receiving end and low-earth-orbit satellite communication system |
| CN113791433A (en) * | 2021-08-18 | 2021-12-14 | 上海卫星工程研究所 | Satellite remote bit error rate test system, test method and system |
| CN113965309A (en) * | 2021-10-12 | 2022-01-21 | 上海航天测控通信研究所 | Optimal frame header locking method in frame synchronizer |
| CN114221748A (en) * | 2021-11-30 | 2022-03-22 | 中国人民解放军63921部队 | Deep space low code rate data frame backtracking method |
| CN114765528A (en) * | 2021-01-15 | 2022-07-19 | 烽火通信科技股份有限公司 | Frame synchronization method, device, equipment and readable storage medium |
| CN114928433A (en) * | 2022-01-12 | 2022-08-19 | 中国电子科技集团公司第十研究所 | Low data overhead frame synchronizer |
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| CN114928433A (en) * | 2022-01-12 | 2022-08-19 | 中国电子科技集团公司第十研究所 | Low data overhead frame synchronizer |
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