A RANGE ESTIMATION ALGORITHM WITH LOW COMPLEXITY BASED ON IEEE 802.15.4A CHIRP SPREAD SPECTRUM

摘要

PURPOSE: A range estimation algorithm with low complexity based on IEEE.802.15.4a chirp spread spectrum is provided to calculate delay time through an effective pre-process to attenuate interferences such as a multi-path, thereby increasing range estimation performance under an inner environment. CONSTITUTION: A sub chirp is realized by white Gaussian noise and a multi channel. A de-chirped sub chirp is obtained by a pre-process which obtains exact time. A sine signal with delay time information as a frequency component is obtained through the de-chirped sub chirp. The sine signal is divided into a signal and a noise by singular value decomposition. The delay time of each path is obtained by using an algorithm based on a noise space such as an ESPRIT(Estimation of Signal Parameter via Rotation Invariant Technique) and an MP(Matrix Pencil).