TY - GEN
T1 - A high-accuracy frequency estimation approach based on segmental-FFT for code fast acquisition
AU - Huan, Hao
AU - Tao, Ran
PY - 2011
Y1 - 2011
N2 - In this paper, to solve the problem of the Doppler estimation limited by FFT in the traditional code acquisition scheme based on FFT, a method of Doppler estimation for code acquisition based on segmental-FFT phase difference is proposed. First, the despreaded base band data with Doppler frequency is divided into two segments and the FFT is applied on them individually. Then, with the help of the phase difference of the two FFT spectrum at their maximum amplitude position, the Doppler frequency is estimated. At last, a coherent accumulation method is designed according to the phase difference. By theoretical analysis and simulation, the RMS errors of this frequency estimation method is close to CR bound, and the new coherent accumulation gain is higher than non-coherent accumulation gain but lower than the conventional coherent accumulation gain, meanwhile the calculating amount is less than the conventional coherent accumulation.
AB - In this paper, to solve the problem of the Doppler estimation limited by FFT in the traditional code acquisition scheme based on FFT, a method of Doppler estimation for code acquisition based on segmental-FFT phase difference is proposed. First, the despreaded base band data with Doppler frequency is divided into two segments and the FFT is applied on them individually. Then, with the help of the phase difference of the two FFT spectrum at their maximum amplitude position, the Doppler frequency is estimated. At last, a coherent accumulation method is designed according to the phase difference. By theoretical analysis and simulation, the RMS errors of this frequency estimation method is close to CR bound, and the new coherent accumulation gain is higher than non-coherent accumulation gain but lower than the conventional coherent accumulation gain, meanwhile the calculating amount is less than the conventional coherent accumulation.
KW - FFT
KW - coherent accumulation
KW - frequency estimation
KW - phase difference
UR - http://www.scopus.com/inward/record.url?scp=84860618550&partnerID=8YFLogxK
U2 - 10.1109/IMCCC.2011.186
DO - 10.1109/IMCCC.2011.186
M3 - Conference contribution
AN - SCOPUS:84860618550
SN - 9780769545196
T3 - Proceedings - 2011 International Conference on Instrumentation, Measurement, Computer, Communication and Control, IMCCC 2011
SP - 733
EP - 736
BT - Proceedings - 2011 International Conference on Instrumentation, Measurement, Computer, Communication and Control, IMCCC 2011
T2 - 1st International Conference on Instrumentation and Measurement, Computer, Communication and Control, IMCCC2011
Y2 - 21 October 2011 through 23 October 2011
ER -