A new ranging application of UWB modulated by orthogonal waves in wireless sensor network

In order to decrease the signal length and transmitting time, improve accuracy of the delay time estimate, complete the mission of ranging and communication at the same time, a new ultra wideband (UWB) ranging method is developed in this paper. This method modulates the training sequence and information signals respectively on two carrier waves which are orthogonal mutually, and then combines them to transmit. When the sensor receives the signal, it decomposes the signal with the characteristic of orthogonal waves to get the training sequence and information signals. On this condition, we design the system using this ranging method, analyze the factors which can improve the ranging performance, and simulate the system. The result of the simulation indicates that the system which uses this ranging method can transmit the training sequence and information signals at one time and improve the ranging performance observably.