CN104378571A - Real-time extraction and superposition method of absolute time - Google Patents

Abstract

The invention discloses a real-time extraction and superposition method of absolute time. A large-scale integrated chip FPGA is adopted to be used as a control and data processing chip; a single chip microcomputer is adopted to be used as a time extraction and processing chip; a superposition chip with a word stock and a video input interface inside is selected to achieve the video image and time superposition function; after testing, data are read, and the time is found and extracted to be used as file names of read-out data according to a designed frame format. According to the method, the aim that the month, the day, the hour, the minute and the second of the time are used as the file names of stored data of a data recording system, and meanwhile real-time superposition of test time (displayed as the month, the day, the hour, the minute and the second) is carried out for synchronizing of collected and stored video images; the problem that after multiple tests, when all data analysis is read back, the data files cannot correspond to the test condition and the test flow is solved.

Description

A kind of extract real-time of absolute time and stacking method

Technical field

The present invention relates to a kind of extract real-time and stacking method of absolute time, relating to the absolute time that more than digital data recording system recorded data file establishes test of beginning by cable is particularly filename, and superposes a kind of method of absolute time in the vision signal of record.

Background technology

The digital data recording system that current aircraft uses usually adopt " numeration " mode (as: 001,002 ...) or " address " mode as storing the filename of data, after repeatedly ground experiment or extension fly test, read the data stored again and carry out test situation analysis, being then difficult to combines with the concrete condition of absolute time carries out data analysis; And the vision signal that the target seeker of most of aircraft exports is not containing absolute time information, then vision signal then difficult combining with data file analyze.

Therefore, need to provide a kind of new technical scheme to solve the problems referred to above.

Summary of the invention

The technical issues that need to address of the present invention are to provide a kind of extract real-time and stacking method of absolute time, allow digital data recording system be store the filename of data with the product absolute time starting to test that powers on, the video image simultaneously for storing is superimposed with absolute time in real time.

For solving technical problem of the present invention, the technical solution used in the present invention is:

The extract real-time of absolute time and a stacking method, comprise the following steps:

1) time data reads by single-chip microcomputer from time chip;

2) time data is sent in chip superposed and is superposed with video image by single-chip microcomputer;

3) time data packing is sent into buffer memory FIFO by single-chip microcomputer;

4) program control chip FPGA take-off time data from buffer memory FIFO, and need the coded data of acquisition and recording to insert in PCM data flow by the frame format designed with the video image having superposed the time with other;

5) PCM data are stored in FLASH chip by program control chip FPGA;

6) when reading data, search by the frame format designed and extraction time data as the filename of sense data.

Further, described chip superposed inside carries character library.

Beneficial effect of the present invention: present invention achieves and store the filename of data using the day moon Hour Minute Second of power-on time as digital data recording system, superpose test duration (being shown as moon day Hour Minute Second) in real time for gathering the video frame sync stored simultaneously, after solving test of many times, when whole back read data is analyzed, data file and experimental condition, experiment process cannot be corresponding problem, each data file more effectively can must be combined analysis with concrete test situation, video image by the present invention, allow test situation analysis more accurately, more detailed, more convenient; The searching and get rid of rapider of failure cause.

Accompanying drawing explanation

Fig. 1 is fundamental diagram of the present invention.

Wherein, 1, time chip, 2, single-chip microcomputer, 3, chip superposed, 4, buffer memory FIFO, 5, program control chip FPGA, 6, FLASH chip.

Embodiment

Below in conjunction with the drawings and specific embodiments, the invention will be further described.Following examples, only for illustration of the present invention, are not used for limiting the scope of the invention.

With reference to figure 1, the extract real-time of a kind of absolute time of the present invention and stacking method, comprise the following steps:

1), during single-chip microcomputer 2 power-up initializing, I is passed through ²clock line in clock chip 1 is set high level by C serial line interface, and data line level is constant; Now single-chip microcomputer 2 reads time data that time chip 1 sends here once; Follow-up time added up according to the frame period;

2) time data is sent in chip superposed 3 by single-chip microcomputer 2, chip superposed 3 adopts the character library carried that the time data of binary-coded decimal is converted to time character string information, the display position of positional information regulation time character string initial point on video that location register built-in in chip superposed 3 is sent here according to single-chip microcomputer 2, thus generate the new video image being superimposed with temporal information;

3) time data packing feeding FIFO is carried out buffer memory by single-chip microcomputer 2;

4) when the data in FIFO reach full capacity, program control chip FPGA5 responds once, takes out corresponding time data, superposed the video image of time and other needs the coded data of acquisition and recording to carry out digital processing and inserts in PCM data flow by the frame format that designs from FIFO buffer memory;

5) PCM data flow is stored in FLASH chip by program control chip FPGA5;

6) when reading data, search by the frame format designed and extraction time data as the filename of sense data.

The present invention adopts large scale integrated chip (LSI chip) FPGA as control and data processing chip, and program control chip FPGA5 inside comprises configurable logic blocks CLB, exports input module IOB and interconnector part; Single-chip microcomputer 2 is adopted to extract and process chip as the time; Inside is selected to carry character library and have the chip superposed 3 of video input interface to realize video image, time overlaying function; When reading data after test, search by the frame format designed and extraction time as the filename of sense data.

Present invention achieves and store the filename of data using the day moon Hour Minute Second of power-on time as digital data recording system, superpose test duration (being shown as moon day Hour Minute Second) in real time for gathering the video frame sync stored simultaneously, after solving test of many times, when whole back read data is analyzed, data file and experimental condition, experiment process cannot be corresponding problem, each data file more effectively can must be combined analysis with concrete test situation, video image by the present invention, allow test situation analysis more accurately, more detailed, more convenient; The searching and get rid of rapider of failure cause.

Claims (2)

1. the extract real-time of absolute time and a stacking method, is characterized in that: comprise the following steps:

1) time data reads by single-chip microcomputer from time chip;

2) time data is sent in chip superposed and is superposed with video image by single-chip microcomputer;

3) time data packing is sent into buffer memory FIFO by single-chip microcomputer;

4) program control chip FPGA take-off time data from buffer memory FIFO, and need the coded data of acquisition and recording to insert in PCM data flow by the frame format designed with the video image having superposed the time with other;

5) PCM data are stored in FLASH chip by program control chip FPGA;

6) when reading data, search by the frame format designed and extraction time data as the filename of sense data.

2. the extract real-time of a kind of absolute time according to claim 1 and stacking method, is characterized in that: described chip superposed inside carries character library.