Optimized Parameter Estimation for the LPM Local Positioning System

The LPM local positioning system is based on a bi-static frequency-modulated continuous-wave radar where the frequency ramps are generated by two different units of circuitry: one of higher quality in the base station (BS) and one optimized for low power consumption in the transponder (TP). This dif...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2013-01, Vol.62 (1), p.153-166
Main Authors: Pfeil, Reimar, Schuster, Stefan, Stelzer, Andreas
Format: Article
Language:English
Subjects:
Chirp
Chirp modulation
Electric circuits
Estimation
Frequency estimation
Instrumentation
Least squares method
least squares methods
multipath channels
Position measurement
Power consumption
Radar
radar signal processing
Ramps
Simulation
Stations
Studies
Vectors
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Summary:The LPM local positioning system is based on a bi-static frequency-modulated continuous-wave radar where the frequency ramps are generated by two different units of circuitry: one of higher quality in the base station (BS) and one optimized for low power consumption in the transponder (TP). This difference in circuitry causes a small chirp rate difference (CRD) between the ramp incline of the BS and that of the TP, which has previously been considered negligible. We show that it is imperative to take account of this CRD in the intermediate frequency signal. We derived a method based on a nonlinear least squares (NLS) estimation principle to estimate its value. The NLS method can further be used for fault detection and to mitigate the effect of multipath signals, which we validate with both simulated and measured data.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2012.2212593