The acquisition method based on two-dimensional search needs a long time, while the method based on segmented parallel correlation will improve the acquisition time remarkably. First, the principle of the method is introduced. Secondly, the structure of the segmented parallel correlation is discussed in detail. On this basis, mathematical analysis and computer simulation are made of coherent integral time and non-coherent number. Finally, the performances of the method with different coherent integral time and non-coherent number are compared.