In order to provide reference for design of pedestrian positioning algorithm

the positioning precisions of inertial navigation system（ INS） and pedestrian dead reckoning（ PDR） algorithms based on foot-strapdown inertial sensor are compared. In an open space equipped with ultra-wide band（ UWB） positioning equipment

the subject wears the foot-mounted inertial measurement unit（ IMU） and walks a rectangle with a circumference of 124. 2 m at a normal speed. The collected inertial data are processed by INS and PDR algorithms

respectively

to obtain the pedestrian position. The UWB positioning result is used as a reference to evaluate the positioning precisions of the two algorithms. The experimental results show that the average positioning precisions of INS is 1 m higher than that of PDR

and with the increase of walking distance

the positioning error of PDR is much higher than INS

which reaches more than 2 m.