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Non-line-of-sight (NLOS) propagation biases Time of Arrival (TOA) and Time Difference of Arrival (TDOA). It causes the principal error for the mobile location in cellular networks. To mitigate the positioning error, a mobile positioning approach based on modified Kalman filter is proposed in this paper. With this approach, the true range is estimated based on the measurements, and the estimated range...
This paper introduces the principal of digital matched filters (DMFs), and based on Field Programmable Gate Array (FPGA), we make an analysis and optimization of DMFs which used in the quick acquisition of Pseudo-Noise (PN)-code for Global Position System (GPS). A structure as “Random Access Memory (RAM)-based shift register + folded” DMF is given in this paper. Compared with traditional folded DMF,...
In TDOA cellular mobile location, Non-Line-of-Sight (NLOS) propagation of radio waves brings about the larger errors of TOA/TDOA parameter measurements, thus resulting in location accuracy decreasing seriously. On the basis of TDOA errors analysis and NLOS characteristics investigation, a NLOS mitigation algorithm is proposed in this paper to realize the TDOA smoothing and LOS reconstruction by Kaiman...
In the cellular wireless location, the presence of Non Light of Sight (NLOS) declined the location performance dramatically. To overcome the impact of NLOS on mobile positioning, a mobile positioning method based on biased Kalman filter and TDOA data reconstruction is presented in this paper. According to NLOS error distribution feature, NLOS smoothing of measurements and data reconstruction are accomplished...
The location technology based on time difference of arrival (TDOA) is one of the key technologies in The 3rd Generation Telecommunication. In this paper, TDOA positioning method based on modified Chan algorithm for CDMA2000 mobile network is proposed. Pilot delay measurement is adopted to realize TDOA positioning parameter detection. A mathematical model of TDOA positioning is established and the...
In order to achieve long-term covert precise navigation for an underwater vehicle, the shortcomings of various underwater navigation methods used are analyzed. Given the low navigation precision of underwater map-matching aided inertial navigation based on single-geophysical information, a model of an underwater map-matching aided inertial navigation system based on multi-geophysical information (gravity,...
Multi-carrier modulation based on the wavelet is applied on power line communication to obtain high communication performance in this paper. The noise and attenuation model of power line channel for the data communication are established at first, on which the multi-carrier modulation method based on complex wavelet packet is adopted. Furthermore, the wavelet-based functions with various support lengths...
A fast method for determining the static voltage stability of modern power systems with static var compensator (SVC) is proposed in this paper. Static var compensator is an important component of flexible AC transmission system, which provides an effective approach to enhance voltage stability and to increase the power transfer capability. This paper discusses the effect of SVC controller on voltage...
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