Patent ID: 7912481
Filing Date: 2011-03-22
Classification: G01S,H04W,Y02D

Abstract:
1. A receiver comprising: a waveform measuring unit to perform multiple analog-to-digital conversions on the received signal while shifting the timing at each Δt a frequency identical to the nominal pulse repetition frequency of a transmit signal made up of intermittent pulse signals subjected to direct spreading or an integer multiple of the same frequency, and at a frequency lower than the multiplicative inverse of the pulse width, and store the observation data from the receive signal in a storage area; and a first path estimator unit to estimate the arrival time of the first path arriving earliest time-wise in the receive signal, based on the stored observation data from the receive signal, wherein the observation data in the waveform measuring unit is waveform data includes: wherein the first path estimator unit includes an output time estimator unit, a threshold comparator unit, and a minimum detector unit, wherein the output time estimator unit to calculate the output time differential between the demodulated path and the arrival time data T(N) for the multiple waveform data M(1−K), and waveform data for the peak values of the output time P(1−K), wherein the threshold comparator unit compares the waveform data M(1−K) with the specified threshold TH, and outputs the arrival time T(N) when M(N)>TH is satisfied, and wherein the minimum detector unit estimates the minimum value for the arrival time data T(N) as the first path.