Vibration-test force limits derived from frequency-shift method

1995 ◽  
Vol 32 (2) ◽  
pp. 312-316 ◽  
Author(s):  
Terry D. Scharton
Keyword(s):  
Frequency Shift ◽  
Vibration Test ◽  
Shift Method

Qestimation from reflection seismic data for hydrocarbon detection using a modified frequency shift method

2015 ◽  
Vol 12 (4) ◽  
pp. 577-586 ◽  
Author(s):  
Fangyu Li ◽  
Huailai Zhou ◽  
Nan Jiang ◽  
Jianxia Bi ◽  
Kurt J Marfurt
Keyword(s):  
Frequency Shift ◽  
Seismic Data ◽  
Shift Method ◽  
Hydrocarbon Detection ◽  
Reflection Seismic

An improved frequency shift method for ATI-SAR flat earth phase removal

2019 ◽  
Vol 38 (8) ◽  
pp. 94-100
Author(s):  
Yubin Zhang ◽  
Jie Zhang ◽  
Junmin Meng ◽  
Chenqing Fan
Keyword(s):  
Frequency Shift ◽  
Shift Method

Acquisition Algorithm for GPS Signal Based on Frequency Shift Method

2012 ◽  
Vol 182-183 ◽  
pp. 1943-1947
Author(s):  
Jian Liang Zhu ◽  
Yu Ming Bo ◽  
Jie Zhang
Keyword(s):  
Frequency Shift ◽  
Function Method ◽  
Digital Signal ◽  
Trigonometric Function ◽  
Schematic Diagram ◽  
Correlation Peak ◽  
Shift Method ◽  
Mathematical Formula ◽  
Dual Channel ◽  
True Signal

In this paper, we come up with the idea of using frequency shift method to strip carrier when acquiring the GPS signal. The RF uses the quadrature demodulator and dual channel to sample the signal, forming the IF digital signal in I channel and Q channel. The paper derivates the mathematical formula of the frequency shift method, and compares the trigonometric function method with it from the aspect of schematic diagram and calculating. Also, we make simulation of the two schemes using Matlab for both true signal and analog signal. And it comes out that the frequency shift method has got a much greater correlation peak than the trigonometric function method. So we come to the conclusion that it is better using the frequency shift method to acquire signal in low signal intensity.

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