Carrier tracking circuit and carrier tracking method
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The invention relates to a carrier tracking circuit and a carrier tracking method. The carrier tracking circuit is composed of a carrier NCO, a sine LUT, a cosine LUT, a code generator and a shift register, correlators, a code NCO, an EPL carrier phase discriminator loop and a code phase discriminator loop. In addition, the carrier tracking method includes: the carrier NCO, the sine LUT, and the cosine LUT form an in-phase circuit and an orthogonal circuit; the in-phase circuit, the orthogonal circuit, the code generator and the shift register form an advance code, an instant code, and a lag code; the correlation operation is carried out on the codes and results are outputted to the correlators; and then carrier phase and code discrimination is carried out on tracked signals in the carrier phase discriminator loop and the code phase discriminator loop. Therefore, the precision of the carrier tracking circuit is improved.