Indoor Positioning using IMU and Radio Reciever
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1 1 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Indoor Positioning using IMU and Radio Reciever Anders Mannesson 1 Muhammad Atif Yaqoob 2 Bo Bernhardsson 1 Fredrik Tufvesson 2 1 Department of Automatic Control Lund University, Lund, Sweden 2 Department of Electrical and Information Technology Lund University, Lund, Sweden
2 Motivation 2 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever
3 3 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Motivation GPS gives decent positioning accuracy assuming clear line of sight to the satelites.
4 4 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Motivation GPS gives decent positioning accuracy assuming clear line of sight to the satelites. For areas where the signals are not available, several other positioning soultions has been proposed using WiFi, UWB, cameras etc.
5 5 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Motivation GPS gives decent positioning accuracy assuming clear line of sight to the satelites. For areas where the signals are not available, several other positioning soultions has been proposed using WiFi, UWB, cameras etc. Our approach: use the cellular network and the hardware avaliable in a phones for positioning.
6 6 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Background - Dead reckoning using IMU IMU:s are avaliable in all smart phones today.
7 7 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Background - Dead reckoning using IMU IMU:s are avaliable in all smart phones today. The accelerometer measures the external forces acting on the device.
8 8 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Background - Dead reckoning using IMU IMU:s are avaliable in all smart phones today. The accelerometer measures the external forces acting on the device. The gyroscope measures the rotational speed of the device.
9 9 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Background - Dead reckoning using IMU IMU:s are avaliable in all smart phones today. The accelerometer measures the external forces acting on the device. The gyroscope measures the rotational speed of the device. - +
10 10 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Background - Synthetic Arrays A synthetic antenna array is formed by moving a single reciever antenna and simultanusly tracking the local position with the IMU. Antenna Rx Unit IMU
11 11 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Measurements The phase of the recieved radio signal is dependent on the local position where the signal was sampled and angle of arrival of the radio signal. Measurements from radio reciever: y k = N α n k ei[cos(θn k )px k +sin(θn k )py k +νk] +e k e CN(0,σr) 2 n=1 Tx2 y Tx1 x Tx3
12 12 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked.
13 13 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked. To estimate the states given the measurement equations different estimation algorithms has been considered.
14 14 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked. To estimate the states given the measurement equations different estimation algorithms has been considered. The extended Kalman filter
15 15 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked. To estimate the states given the measurement equations different estimation algorithms has been considered. The extended Kalman filter The unscented Kalman filter
16 16 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked. To estimate the states given the measurement equations different estimation algorithms has been considered. The extended Kalman filter The unscented Kalman filter The particle filter
17 17 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Modeling - Sensor Fusion The unknown states that we want to estimate are {p k,v k,q k, α 1,...,N k, θ 1,...,N k, ν k } T R 12+2N wherendenotes the number of radio sources to be tracked. To estimate the states given the measurement equations different estimation algorithms has been considered. The extended Kalman filter The unscented Kalman filter The particle filter Marginalized particle filter
18 18 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Results from simulations A marginalized particle filter has been implmented in Matlab and IMU and RF signals are generated. The filter is initialized without any knowledge abot the radio channel but the AOA are known to±20.
19 19 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Setup Experiment A real world experiment:
20 20 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Setup Experiment A real world experiment: A monopole antenna and a low cost IMU is mounted to a stick. A pen is attached and a big sheet to laid out to capture the ground true movement.
21 21 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Setup Experiment A real world experiment: A monopole antenna and a low cost IMU is mounted to a stick. A pen is attached and a big sheet to laid out to capture the ground true movement. Two transmitter antennas placed around the tripod acting as controlled scatterers. The antennas were fed from a single signal generator using two splitters.
22 22 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Setup Experiment A real world experiment: A monopole antenna and a low cost IMU is mounted to a stick. A pen is attached and a big sheet to laid out to capture the ground true movement. Two transmitter antennas placed around the tripod acting as controlled scatterers. The antennas were fed from a single signal generator using two splitters. Synchronized signals from the receiver antenna and the IMU were recorded with a software defined radio from National Instruments.
23 Setup Experiment 23 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever
24 Result from Experiment 24 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever
25 25 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated.
26 26 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated. Different flavours of Particle filters has been implemented and tested with both simulated data and real world experiments with good results.
27 27 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated. Different flavours of Particle filters has been implemented and tested with both simulated data and real world experiments with good results. Things that are left to do:
28 28 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated. Different flavours of Particle filters has been implemented and tested with both simulated data and real world experiments with good results. Things that are left to do: Glue the filter together with initializing algorithms fro AOA estimation.
29 29 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated. Different flavours of Particle filters has been implemented and tested with both simulated data and real world experiments with good results. Things that are left to do: Glue the filter together with initializing algorithms fro AOA estimation. Study the influence of phase drift in the reciever.
30 30 / 30 Mannesson et al., Indoor Positioning using IMU and Radio Reciever Summary A measurement model has been derived and a state estimation problem is formulated. Different flavours of Particle filters has been implemented and tested with both simulated data and real world experiments with good results. Things that are left to do: Glue the filter together with initializing algorithms fro AOA estimation. Study the influence of phase drift in the reciever. Do experiments indoors and in other radio environments.
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