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Receiver, receiver for positioning system using the same, and positioning method

  • US 7,912,481 B2
  • Filed: 06/25/2007
  • Issued: 03/22/2011
  • Est. Priority Date: 09/27/2006
  • Status: Expired due to Fees
First Claim
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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 Δ

    t 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;

    peak values for matched filter outputs obtained at each measurement timing by applying matched filter processing containing tap coefficients matching the spreading code applied to the data after analog-to-digital conversion of the transmit signal; and

    the output time of those peak values,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, andwherein the minimum detector unit estimates the minimum value for the arrival time data T(N) as the first path.

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