Patent ID: 7486225
Filing Date: 2009-02-03
Classification: H04B

Abstract:
1. A radar device that detects an object, comprising: (a) a spreading code generator device, comprising: a reference code generator that generates a reference code, a phase corrector that produces a sweep command signal for use in shifting the phase of a spreading code in a predetermined sweep range, compares the phase of the spreading code being shifted with the phase of the reference code to obtain phase difference data, and produces a correction signal based on the phase difference data to keep the spreading code in phase with the reference code, and a spreading code generator that shifts the spreading code in response to the sweep command signal, optimizes the phase of the spreading code according to the correction signal and produces the spreading code while varying its phase offset; (b) a radio wave signal transmitter that produces a radio wave signal by modulating a carrier wave with the reference code and emits the radio wave signal; (c) a radio wave signal receiver that receives the radio wave signal reflected by an object and demodulates the received radio wave signal into an in-phase component and a quadrature component; (d) a correlation detector that produces correlation-detected values by performing correlation detection of the in-phase and quadrature components using the spreading code; and (e) a speed/distance detector that calculates power of correlation-detected values to determine a distance to the object and a speed of the object.