Spectrum diffusion signal analyzer and method of analyzing diffusion signal

A method of analyzing a spectrum diffusion signal comprising:

• AD transforming an inputted spectrum diffusion signal into a digital data series;
• orthogonal-transforming the digital data series, and temporally storing the orthogonal-transformed data series;
• complex-multiplying each sample having the orthogonal-transformed data series and the complex conjugate of the diffusion code signal;
• discrete-Fourier-transforming samples corresponding to a period of the diffusion code of the complex-multiplied sample;
• calculating squared absolute values with respect to each frequency component of the discrete-Fourier-transformed samples;
• repeating the multiplication, the Fourier-transformation, and the square calculation with sequentially shifting a relative phase between the orthogonal-transformed data series and the diffusion code signal within a chip period until a sum of the shifted relative phases arrives at one period of the diffusion code;
• and
• searching a timing drift from inputted signal to a calculated result of the square calculation in accordance with the calculated result of the square calculation, and of searching a carrier wave frequency error of the inputted signal.

A spectrum diffusion signal analyzer comprising:

• an orthogonal-transforming device that orthogonal-transforms an input spectrum diffusion signal;
• a first calculation device that calculates a product of the orthogonal-transformed signal and a complex-conjugate of a diffusion code signal;
• a discrete-Fourier-transformation device that discrete-Fourier-transforms a data series of the calculated product;
• and
• a second calculation device that calculates a squared absolute value of each Fourier-transformed coefficient.