Patent ID: 7486745
Filing Date: 2009-02-03
Classification: G01S,H04L

Abstract:
1. Method of receiving a ranging signal in a receiving device for forming a path number discriminant that can be used to conclude with least error the presence of one or more secondary path signals in an observation of a received signal in a ranging receiver, comprising the following steps: (a) in the receiving device, generating a first path number discriminant by repeatedly forming a quantity J i) the column vector of samples of a direct path signal envelope A ii) if secondary path signals are present in r, a vector composed of the corresponding samples of one or more secondary path signals  each such signal delayed from the direct path signal and with an amplitude, phase shift, and delay denoted by A iii) a vector of samples of competing zero-mean Gaussian noise with real-valued covariance matrix K (b) on each repetition in Step (a), generating a new vector r using independently selected random values for the amplitude A (c) using the resulting values of J (d) for each i, i=2, . . . ,I, where I≧2, generating an i  with r a composite of the direct path signal and i−1 secondary path signals as described in Step (a) with an amplitude A (e) for each i, i=2, . . . ,I, using the resulting values of J (f) on observing a received signal vector r carrying out a test for the number of signal paths by first forming J alternatively, if J if J