The invention relates to an online BP (Belief Propagation) decoding method for an LT (Luby Transform) code. The method comprises the following steps of acquiring a receiving frame; carrying out one-time decoding on the receiving frame; and repeating the two steps until all original frames are restored. According to the method, the one-time decoding is carried out each time when the receiving frameis acquired, thereby acquiring the original frame, or the receiving frame incapable of being decoded is stored, and the previous receiving frame incapable of being decoded is decoded through adoptionof the subsequently acquired receiving frame, thereby obtaining the original frame; and the restored receiving frame is no longer stored. According to the method, under the condition that the previously decoded receiving frame exists, the receiving frame is acquired and decoded at the same time, the decoding delay is reduced, the repeated receiving frame is identified and discarded, the redundancy of receiving codes of a receiving end is reduced, and the load of a receiving end system is reduced.

Decoding method for LT (Luby Transform) code and device thereof

A rapid extraction method for seismic information includes the following steps: selecting an extraction range of seismic data; selecting a type of extracted seismic data; formulating a template of a seismic data report; and extracting the seismic data, adding the seismic data to the report, and producing a target report. A rapid extraction system for the seismic information includes: a basic seismic data extraction module; an epicenter distance calculation module; a thematic map template customization module; a report template customization module; a thematic map automatic output module; and areport automatic generation module. After a felt earthquake, rapid customization extraction is performed on basic information, the report contains not only text description and is also accompanied bya seismic data table and map display, and so, the practicality of the report is improved, mistakes and omissions probably existing in manual intervention in an extraction process is reduced, a reportoutput speed is improved, and an emergency response capability is enhanced.

Rapid extraction method and system for seismic information

The invention discloses a short-wave communication two-way transmission mode based on a fountain code The mode is a short-wave wireless communication data transmission mode and specifically is the transmission mode made for the condition that a wireless transmission channel is instable and the transmission is unreliable The mode belongs to related technical fields such as short-wave radio station wireless communication systems and data encoding/decoding The short-wave communication system based on the fountain code is composed of a central control module, a communication protocol processing module and a data link processing module The communication protocol processing module is composed of an encoding/decoding unit, a framing unit and a speed regulation unit Through combination of the code rate independence of the fountain code and application features of large scale data distribution and reliable broadcasting of the fountain code, and the state feedback of a receiving end, the sending efficiency can be greatly improved by carrying out self-adaptive speed change, and addition and subtraction of one-time sending quantity

Short-wave communication two-way transmission mode based on fountain code

The invention discloses a QGIS-based comprehensive query system of seismic information. The system includes a seismic-information database, a GIS and a display system. According to the comprehensive query system, the seismic information is identified at geographic information locations and latitude and longitude coordinates, by which seismic sources can be visually seen in a map, to assist in thevector map of railway trunk lines, location relationships between selected locations of stations and the existing railway trunk lines can be more clearly seen and analyzed, and impacts of a certain earthquake on sections and the railway trunk lines are visually seen through analyzing a seismic waveform file. According to the comprehensive query system, viewing and analysis of the seismic information can be realized in multiple environments, and storage and viewing of information are more highly efficient and securer. GIS functions in the comprehensive query system are powerful, analysis capability and multiple functions can enable a seismic analyst to easily use a computer to realize browsing of the GIS and data analysis operations, and work efficiency is greatly improved.

QGIS-based comprehensive query system of seismic information

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Short-wave communication two-way transmission mode based on fountain code

QGIS-based comprehensive query system of seismic information