FIELD: radio engineering, communication.
SUBSTANCE: invention discloses a method (100) for detecting a spread spectrum signal (s(t)) with a direct code sequence, which is transmitted at a carrier frequency and is modulated by a code signal whose length is equal to Nc unit elements, for determining code delay of said spread spectrum signal and Doppler shift relative to said carrier frequency, wherein said determination is carried out in a discrete two-dimensional space M of possible code delays and F possible frequency shifts, wherein the method (100) comprises the following steps: receiving and sampling (102) said spread spectrum signal to obtain a sampled spread spectrum signal; compressing (103) said sampled spread spectrum signal with the signal of a local copy of said code signal by performing said compression for a plurality of possible code delays between said sampled signal and said copy signal; performing parallel frequency search (104, 105, 107, 108, 109) based on results of said compression step by carrying out a step (104) calculating Fourier transform of said results. The Fourier transform is fractional Fourier transform.
EFFECT: faster scanning of a search grid and reduced computational costs.
15 cl, 12 dwg
