Abstract: An efficient adaptive seismic data flow lossless compression and decompression method, which aims at solving the problem that data occupies the storage space and affects the transmission efficiency and is used for efficiently compressing geophysical instrument data, particularly seismic data after 24-bit analog-to-digital conversion. In the method, a data flow is compressed in a lossless mode in real time, and sampling data is adaptively compressed into 1 byte or 2 bytes or 3 bytes from original 24 bits and 3 bytes in a coding manner. Besides the foregoing data ranges, other integers that can be expressed by other 24-bit integer data with symbols are required to be expressed by 4 bytes after being operated through a compression algorithm. The method has the advantages of saving a large amount of storage space and remarkably increasing the data transmission efficiency.

Abstract: An efficient adaptive seismic data flow lossless compression and decompression method, which aims at solving the problem that data occupies the storage space and affects the transmission efficiency and is used for efficiently compressing geophysical instrument data, particularly seismic data after 24-bit analog-to-digital conversion. In the method, a data flow is compressed in a lossless mode in real time, and sampling data is adaptively compressed into 1 byte or 2 bytes or 3 bytes from original 24 bits and 3 bytes in a coding manner. Besides the foregoing data ranges, other integers that can be expressed by other 24-bit integer data with symbols are required to be expressed by 4 bytes after being operated through a compression algorithm. The method has the advantages of saving a large amount of storage space and remarkably increasing the data transmission efficiency.

Abstract: A digital seismic recorder including wired, wireless and cable-less telemetry, which is optimized and combined from three types of instrument: a wired telemetry digital seismic recorder, a wireless telemetry digital seismic recorder and a cable-less digital seismic recorder, is divided into four main parts: a central control operating system (CCOS), a wired telemetering Acquisition Station (AS), a Wireless telemetering Acquisition Station (WAS) and a Cable-less Acquisition Station (CAS). The CCOS is respectively connected to a wired communication Root Unit (RU), a Wireless communication Root Unit (WRU) and a Cable-less Data Unit (CDU), and controls and connects the AS via the RU, controls and connects the WAS via the WRU, and retrieves the data of the CAS via the CDU.

Abstract: A million channel-class digital seismometer based on a computer network, the hardware thereof consisting of seven major units: a central control operating system (CCOS), a root unit (RU), a network unit (NU), a power unit (PU), an acquisition link (AS), a fiber line (FL), and a network line (NL); wherein the CCOS is a control center and a data retrieving center for the entire instrument, the RU is a connection interface between the COOS and a field device; a plurality of NUs are serially connected via the FL to form a network unit link NUS, and the RU is connected to one or more NUS; the PU and the AS are randomly and serially connected to form an acquisition line (AL), and any PU on the AL is connected to the NU via a 100-Mbit/s NL.