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RISS 인기검색어
- 검색키워드
- 저자 : Dinesh MANANDHAR (검색결과 3 건)
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GEO-REFERENCING OF MULTI-SENSOR RANGE DATA FOR VEHICLE-BORNE LASER MAPPING SYSTEM(VLMS)
Manandhar, Dinesh,Shibasaki, Ryosuke 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
Laser mapping has became quite popular in recent days due to it's capability of providing information directly in three dimension. However, the present laser mapping systems are either air-borne or ground-based (on a static platform). We cannot achieve detail information from air-borne system, though it has it's own suitability for applications like DEM generation. Ground based static systems are not suitable far larger area mapping purpose. The vehicle-borne laser mapping system (VLMS) use laser scanners for three dimensional data acquisition, CCD cameras for texture information, GPS, INS and odometer fax positioning information. The data obtained by this system could be a good resource for developing urban 3D database, which has numerous applications in the field of virtual reality, car navigation, computer games, planning and management. In this paper, we discuss about the system architecture of VLMS, calibration of sensors, integration of all these sensors and positioning devices far direct geo-referencing.
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Analysis of GPS Signal Acquisition Performance
Xiaofan LI,Dinesh MANANDHAR,Ryosuke SHIBASAKI 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
Acquisition is to detect the presence of the GPS signal. Once the signal is detected, the estimated frequency and code phase are passed to a tracking loop to demodulate the navigation data. In order to detect the weak signal, multiple length of data integration is always needed. In this paper, we present five different acquisition approaches based on circular correlation and Fast Fourier Transform (FFT), using coherent as well as non-coherent integration techniques for the multiple length of collected GPS satellite signal. Moreover a general approach of determining the acquisition threshold is introduced based on noise distribution which has been proved effective, and independent of the hardware. In the end of this paper, the processing speed and acquisition gain of each method are illustrated, compared, and analyzed. The results show that coherent approach is much more time consuming compared to noncoherent approaches, and in the case of multiple length of data integration from 2ms to 8ms, the processing times consumed by the fastest non-coherent acquisition method are only 25.87% to 1.52% in a single search, and 34.76% to 1.06% in a global search of those in the coherent acquisition. However, coherent acquisition also demonstrates its better performance in the acquisition gain, and in the case of 8ms of data integration it is 4.23 to 4.41 dB higher than that in the non-coherent approaches. Finally, an applicable scheme of combining coherent and non-coherent acquisition approaches in the development of a real-time Software GPS receiver in the University of Tokyo is provided.
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Airborne GPS Reflectometry from Low Altitude Aircraft
Takuji Ebinuma,Yasuda Akio,Dinesh Manandhar 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This work is intended to develop a software-defined Global Positioning System (GPS) receiver specifically designed to process reflected GPS signal off the ground or the ocean surface for purpose of remote sensing. A set of airborne campaign was conducted to evaluate the performance of the prototype GPS reflectometry receiver. The reflected signal was tracked in open-loop manner using the so called delay mapping receiver. The result shows that theprototype receiver was capable of providing altimetric measurements with a precision level of the order of few meterswith an unknown system bias which should be estimated.
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