At present, artificial bait casting and water quality detection are widely used in the domestic aquaculture, it is difficult to improve the yield and quality of the output of aquatic products such as fish, prawn and crab because of low production efficiency and limited labor force. This paper proposed an automatic aquaculture workboat driven by air propellers based on 3G(GNSS、GIS、GPRS), equipped with main controller ARM11, automatic path planning and tracking based on GIS and GNSS system and remote monitoring with GPRS communication module, the workboat can perform bait casting and water quality parameters detection such as dissolved oxygen, pH, water temperature, ammonia nitrogen and salinity automatically according to the aquaculture tasks. It can improve the aquaculture work efficiency and save the manpower and the material resources.

Design of Automatic Aquaculture Workboat Driven by Air Propellers

The structure of the data collecting system and the interface circuit were designed in terms of characteristics and conditions of Palmsize Computer, and software for Windows CE was developed by using OOP language (C++) and multi thread technology.

Data collecting system on palmsize computer

A new model of SMS platform is proposed in this paper Based on this model, with the techniques of the Bluetooth, socket, embedded operation, remote control, and database processing, a system is designed as an example With this efficient model, the system can be mainly buildup by the hardware of mobile devices and networked computers This SMS platform can be easily integrated with OAS (office automation system), and many other applications The study of this paper also gives a further insight about the limitation of the system and discusses what should be improved in the future

A Model of Building Networked SMS Platform Services Based on Mobile Technology

This paper has developed a new-type groundwater dynamic auto-monitoring system based on Smart Device. The system adopted Smart Device as host computer of data acquisition, used Windows Mobile which was prevalent operation system of Smart Device now, software development environment Visual Studio.NET 2003, and C# as the developing language based on .NET framework. It adopted serial port RS232 as the communication interface between Smart Device and monitor host machine and utilized multi-threading design to achieve serial port communication. It adopted the standardized and textual XML to store the data. And this system implemented the function of data acquiring, file managing, and analysing and displaying. In virtue of fully considerations in characteristic of Smart Device, this system had the succinct window interface, simply operation, powerful function, and was very convenient to carry. Moreover it has already made very good use result in practice.

Application Research on Groundwater Dynamic Auto-Monitoring System based on Smart Device

When attenuation and chromatic dispersion are compensated for, polarization mode dispersion (PMD) is a major limitation to the transmission capabilities of optical communication systems. So it is necessary to study PMD. In the paper, we simulated first-order PMD statistical properties, the relationship of Mean DGD and transmission distance, the deterioration of the receiver pulse broadening induced by PMD on pulse broadening theory, the distance relay L limited by system transmission speed B under different PMD, several systems of different PMD restrict the transmission distance etc., come to conclusion that PMD have some restrictions on high-speed system design. And the higher the rate, the shorter the distance relay. For low-speed system, by choosing low values of fiber PMD can increase distance relay, but for high-speed system, it is not a good idea to improve the system by selecting the optical fiber. In the actual design, you should consider PMD index of optical fiber, chosen code pattern of the system, transmission rate and error rate etc.

Analysis of the characteristic of optical communication system influenced by first-order polarization mode dispersion

With the development of optical fiber communication, and after chromatic dispersion and attenuation are compensated
for, polarization mode dispersion (PMD) in optical fibers becomes more and more important and cannot be ignored when
the transmission system is up to 40Gbit/s or above, or transmission distance is several thousand kilometers long. In the
paper, it is discussed four kinds of compensation schemes in 40Gbit/s optical communication system, it point out that
transmission distance is different when use different compensation schemes by pulse broadening theory. And when the
transmission speed is very high or the transmission distance is very long, it is necessary to compensated high-order PMD.
It compared 2nd-order PMD compensated system and first-order PMD compensated system, it point out that
2nd-order PMD compensated system is much better than first-order PMD compensated system by pulse broadening
theory.

Xiu-hong Chen

Papers

Application Research on Groundwater Dynamic Auto-Monitoring System based on Smart Device

Analysis of the characteristic of optical communication system influenced by first-order polarization mode dispersion

Analysis of four schemes of polarization mode dispersion compensation in a 40Gbit/s optical communication system