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Joint Estimation of Position and Gain for RFID-Tag Assisted Surgery Support System. Katsushi Matsuda*, Hiromi Takahata **, Osamu Oshiro **, Minoru Okada* * Graduate School of Information Science, Nara Institute of Science and Technology, Nara, Japan

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slide1

Joint Estimation of Position and Gain

for RFID-Tag AssistedSurgery Support System

Katsushi Matsuda*, Hiromi Takahata**, Osamu Oshiro**, Minoru Okada*

* Graduate School of Information Science, Nara Institute of Science and Technology, Nara, Japan

**Division of Graduate School of Engineering Science, Osaka University, Osaka, Japan

3D Positioning

RFID-tag assisted surgery support system

Sensor antennas

#3

the sensor antenna is inserted into body through an endoscopic channel, and it receives an RFID signal

#1

The tag position is estimated from strength of the received signal

#2

#4

Reader/ Writer

tag

The tag is implanted near the lesion through bronchoscope before the operation

3D positioning is required

Received Signal Strength

Distance between tag and sensor

RFID tag

Problem in 3D positioning

The position of the k-th sensor antenna

Distance can be estimated by applying

the measured signal strength to:

Relationship between distance and

signal strength

The cost function is given by

Result

Tag Position

Tag Gain

The estimation error performance against the initial

The tag position is obtained by searching for t which minimizes the cost function.

joint

not joint

estimation error [mm]

Problem

・Tag gain information is unknown at the receiver.

・Without tag gain information, the distance is not estimated correctly.

Solution

initial

・the tag gain and the position are estimated simultaneously.

・the tag position and gain are estimated by minimizing this estimation error criteria.

・Proposed algorithm can estimate the tag

position even if initial estimated tag gain tilde α

is different from true tag gain α.

・This means that the proposed scheme is capable

of estimating the tag position accurately even if

the tag gain is not known at the receiver.

Joint tag position and gain

In order to evaluate the performance of the proposed solution, the sequential quadratic programming (SQP) is used for the minimization.