Research on the Key Technologies of Low-Altitude Airspace Surveillance and Navigation System

Zhang, You Hui

doi:10.4028/www.scientific.net/amr.709.436

AMR

2013

DOI: 10.4028/www.scientific.net/amr.709.436

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Research on the Key Technologies of Low-Altitude Airspace Surveillance and Navigation System

You Hui Zhang

Abstract: With the low-altitude airspace opening, the role of surveillance technology in ATC system has increasing prominent. This article used application of image extraction technology, algorithm processing, data fusion and transmission to improve the reliability of surveillance and set up a new structure of network. Finally, we used computers to achieve a new type of low-altitude surveillance system.

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2015

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“…Underwater high precise navigation and positioning technology is the premise and key of AUV. In order to ensure AUV to successfully finish related missions, a long autonomous navigation positioning and return ability are required [2]. In current positioning technology, inertial navigation system is widely used because of its high concealment and high autonomy.…”

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SINS/DVL/LBL interactive aiding positioning technology based on AUV

Zhang

2015

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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Given the quick attenuation of GPSs and radio signals underwater, inertial navigation is selected as the core system of underwater acoustic aiding navigation. A novel positioning technology based on SINS/DVL and LBL interactive aiding is proposed. The integrated navigation systems of the strapdown inertial system (SINS), long baseline, and Doppler sonar are selected as the platforms. Multiple cross-correlation peaks based on the TDOA method of LBL are generated because of the reflection and refraction of sound signals on the seabed and sea surface. The selected TDOA technique is introduced with the aiding of the SINS/DVL, and the precise location of the autonomous underwater vehicle (AUV) is obtained. Subsequently, the AUV position from the LBL can send feedback to the SINS/DVL system. Hence, the SINS/DVL and LBL systems can rectify each other. Furthermore, the position divergence problem of the AUV underwater is overcome by this system. Keywords-inertial navigation; LBL positioning; AUV I. INTRODUNTIONIn the 21st century, human will obtain more and more material resources and living spacing from oceans. Underwater exploration and reconnaissance missions can be finished by autonomous underwater vehicle (AUV) which can move underwater and have visual and perception system [1]. Because the underwater aircraft has a wide range of activities, small size, light weight, low noise and high concealment, it has become an important research direction in developed countries. Underwater high precise navigation and positioning technology is the premise and key of AUV. In order to ensure AUV to successfully finish related missions, a long autonomous navigation positioning and return ability are required [2]. In current positioning technology, inertial navigation system is widely used because of its high concealment and high autonomy. Although inertial technology is gradual mature, positioning error of inertial navigation system needs to be calibrated regularly. Consequently, as the development of inertial navigation technology, correction method is being explored by the entire world [3]. On the other hand, Doppler sonar has good autonomy, fast reaction, good anti-interference, and high velocity measurement precise so it is suit for small underwater vehicle. However, dead reckoning is usually used in current Doppler sonar to obtain the position of AUV which has low precision [4]. As the development of sensor technology, acoustic positioning like ultra short baseline, short baseline and long baseline are gradual applied in the positioning of AUV because the distance of baseline is changeable and they need not aiding platform. It is suit for complex working environment of deep sea because of relatively large dynamic range and faster data refresh rate. However, the precise and continuity is easily influenced by sea environment [5].As the development of acoustic technology, underwater acoustic high precise positioning technology makes a great progress. According to the length of baseline of transponders, acoustic positioning system...

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SINS/DVL/LBL interactive aiding positioning technology based on AUV

Zhang

2015

2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings

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Research on the Key Technologies of Low-Altitude Airspace Surveillance and Navigation System

Cited by 1 publication

References 2 publications

SINS/DVL/LBL interactive aiding positioning technology based on AUV

SINS/DVL/LBL interactive aiding positioning technology based on AUV

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