Pseudo Random Number Coding for Lift Car Position Sensing

Mingxuan Du


Aiming at the disadvantages of the traditional positioning for lift car applications, a novel binary bar coding and sensing technology is presented in this paper. It studies the relationship of the addressable length and the number of digits to be sensed. A more systematic approach is demonstrated to generate the pseudo random code more efficiently than the random sorting method used in the example case. Finally, a function of vector distance is developed to measure the difference of any two groups of the digits to be sensed along the complete code sequence. By searching the maximum of the vector distance, the optimal sequence can be achieved to reduce the chance of decode error.


Lift Car Positioning; Position Addressability; Pseudo Random Code; Vector Distance

Full Text:



Takuya N. Schindler elevator accident [Internet]. Available from:

Honeywell. Sensors and switches in commercial traction elevators [Internet]. Available from:

Zhang W, Li D. Research on barcode image binarization in barcode positioning system. International Journal of Computer Science Issues 2012; 9(5): 108–112.

Petriu EM. Absolute position measurement using pseudo-random binary encoding. Instrumentation & Measurement Magazine IEEE 1998; 1(3): 19–23.



  • There are currently no refbacks.