Joint code acquisition and Doppler shift estimation method for DSSS-MSK signal

2019 ◽  
Author(s):  
Renhong Xie ◽  
Bingxiu Wang ◽  
Wen Qiu ◽  
Shuai Qiao ◽  
Weiwei Zhu ◽  
...  
Keyword(s):  
Doppler Shift ◽  
Estimation Method ◽  
Code Acquisition

Spread-spectrum code acquisition in the presence of Doppler shift and data modulation

1990 ◽  
Vol 38 (2) ◽  
pp. 241-250 ◽  
Author(s):  
U. Cheng ◽  
W.J. Hurd ◽  
J.I. Statman
Keyword(s):  
Doppler Shift ◽  
Spread Spectrum ◽  
Code Acquisition

The Principle and Implementation of P-Code Direct Acquisition

2014 ◽  
Vol 543-547 ◽  
pp. 2205-2208
Author(s):  
Guo Qing Yu ◽  
Rui Jin ◽  
Lei Liu ◽  
Li Bo Du
Keyword(s):  
Doppler Shift ◽  
Average Method ◽  
Utilization Rate ◽  
Acquisition Time ◽  
Data Utilization ◽  
Code Acquisition ◽  
Coherent Integration ◽  
Circular Correlation ◽  
Specific Implementation

It is aimed at reducing the amount of calculation by 4-point average method, replacing coherent integration with circular correlation and Doppler shift searching with the circumference shift coming from FFT results. It uses two DDR2 caches to store FFT results of receiving yards and local codes. It elaborates the specific implementation methods of this algorithm on FPGA in detail, and stimulates the direct P-code acquisition algorithm based on FFT on ModelSim. The results of stimulation show that the algorithm can improves the data utilization rate and save the acquisition time.

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