On the accuracy of in-body TOA ranging inside the gastrointestinal tract using carrier frequency

Body area network is now on its speedway of development, which stresses the importance of in-body localization. Wireless capsule endoscopy, one major application in BAN, helps physicians to work out better treatments and inspections of gastrointestinal tract if wireless capsule endoscope could be more accurately localized. In this paper we first propose the CRLB of TOA ranging inside homogeneous tissue as performance guideline and compare the accuracy of different TOA ranging methods inside homogeneous tissue. Then, simulations inside non-homogeneous tissues are conducted to investigate the impact of non-homogeneity on TOA ranging accuracy qualitatively and quantitatively.