Weighted Least Squares Techniques for Improved Received Signal Strength Based Localization

Tarrío, Paula; Bernardos, Ana M.; Casar, José R.

doi:10.3390/s110908569

Cited by 125 publications

(151 citation statements)

References 24 publications

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“…To determine user positions using only the L1 code observation values of the GPS satellites and the GLONASS satellites, the weighted least squares method was applied (Tarrio et al 2011).…”

Section: Combined Gps/glonass Positioning Methods and Results Verificationmentioning

confidence: 99%

Analysis of the Combined Positioning Accuracy using GPS and GLONASS Navigation Satellites

Choi¹,

Roh²,

Lee³

2013

Journal of Positioning, Navigation, and Timing

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Due to inaccurate safe navigation estimates, maritime accidents have been occurring consistently. In order to solve this, the precise positioning technology using carrier phase information is used, but due to high buildings near inland waterways or inclination, satellite signals might become weak or blocked for some time. Under this weak signal environment for some time, the GPS raw measurements become less accurate so that it is difficult to search and maintain the integer ambiguity of carrier phase. In this paper, a method to generate code and carrier phase measurements under this environment and maintain resilient navigation is proposed. In the weak signal environment, the position of the receiver is estimated using an inertial sensor, and with this information, the distance between the satellite and the receiver is calculated to generate code measurements using IGS product and model. And, the carrier phase measurements are generated based on the statistics for generating fractional phase. In order to verify the performance of the proposed method, the proposed method was compared for a fixed blocked time. It was confirmed that in case of a weak or blocked satellite signals for 1 to 5 minutes, the proposed method showed more improved results than the inertial navigation only, maintaining stable positioning accuracy within 1 m.Keywords: carrier phase based positioning, carrier phase statistics, weak signal environment Therefore, it is necessary to determine the air clearance for safe navigation using the precise positioning technology.Carrier phase measurements should be used together with code measurements for precise positioning. For the pseudorange measurements, the distance between the satellite and the receiver on the ground is predicted using the time delay of C/A code, but for the prediction of distance by carrier phase measurements, changes in carrier phase generated by the satellite is used. Since the wave length of carrier is significantly shorter than the length of C/A code, the distance measured using the carrier phase is more precise than the distance measured using codes. But, Integer ambiguity which is carrier phase wavelength value existing between the satellite and the receiver in the carrier phase measurements, and It is necessary to obtain this integer ambiguity to measure an accurate distance. It is important to obtain and maintain the integer ambiguity in the carrier phase based precise positioning (Parkinson & Spilker 1996). But, a satellite signal may become weak or blocked for some time due to high buildings and mountain INTRODUCTIONCurrently, the global positioning system (GPS) of the United States and the global orbiting navigation satellite system (GLONASS) of Russia are global navigation satellite systems that can perform positioning and provide time information. GPS satellites have been continuously operated as a navigation system since 1980. However, for GLONASS satellites, the service was interrupted for a short period of time due to the financial problem of Russia. Then...

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“…To determine user positions using only the L1 code observation values of the GPS satellites and the GLONASS satellites, the weighted least squares method was applied (Tarrio et al 2011).…”

Section: Combined Gps/glonass Positioning Methods and Results Verificationmentioning

confidence: 99%

Analysis of the Combined Positioning Accuracy using GPS and GLONASS Navigation Satellites

Choi¹,

Roh²,

Lee³

2013

Journal of Positioning, Navigation, and Timing

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“…LMS algorithm can be considered as a basic machine learning algorithm, widely used for parameter estimation [35]. LMS allows finding the values of parameters of a function after several iterative calculations in a computationally efficient way [36].…”

Section: Lms Methodsmentioning

confidence: 99%

A RSSI-based parameter tracking strategy for constrained position localization

Diouris

Wang

2017

EURASIP J. Adv. Signal Process.

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In this paper, a received signal strength indicator (RSSI)-based parameter tracking strategy for constrained position localization is proposed. To estimate channel model parameters, least mean squares method (LMS) is associated with the trilateration method. In the context of applications where the positions are constrained on a grid, a novel tracking strategy is proposed to determine the real position and obtain the actual parameters in the monitored region. Based on practical data acquired from a real localization system, an experimental channel model is constructed to provide RSSI values and verify the proposed tracking strategy. Quantitative criteria are given to guarantee the efficiency of the proposed tracking strategy by providing a trade-off between the grid resolution and parameter variation. The simulation results show a good behavior of the proposed tracking strategy in the presence of space-time variation of the propagation channel. Compared with the existing RSSI-based algorithms, the proposed tracking strategy exhibits better localization accuracy but consumes more calculation time. In addition, a tracking test is performed to validate the effectiveness of the proposed tracking strategy.

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“…is paper, the weighted least squares method (Tarrío et al 2011) of Eq. (4) is used to estimate ion and clock errors of a receiver.…”

Section: Measurement Models For Single-frequency Users (고딕)mentioning

confidence: 99%

Evaluation of Point Positioning Using the Global Positioning System and the Quasi-Zenith Satellite System as Measured from South Korea

Choi¹,

Cho²,

Cho³

2015

Journal of Astronomy and Space Sciences

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Weighted Least Squares Techniques for Improved Received Signal Strength Based Localization

Cited by 125 publications

References 24 publications

Analysis of the Combined Positioning Accuracy using GPS and GLONASS Navigation Satellites

Analysis of the Combined Positioning Accuracy using GPS and GLONASS Navigation Satellites

A RSSI-based parameter tracking strategy for constrained position localization

Evaluation of Point Positioning Using the Global Positioning System and the Quasi-Zenith Satellite System as Measured from South Korea

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