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FAST FOURIER TRANSFORM WITH DOWN SAMPLING BASED NAVIGATIONAL SATELLITE SIGNAL TRACKING
FAST FOURIER TRANSFORM WITH DOWN SAMPLING BASED NAVIGATIONAL SATELLITE SIGNAL TRACKING
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机译:基于下行采样的导航卫星信号跟踪的快速傅里叶变换
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摘要
A method and device to track navigational satellite signals, are claimed. In this invention, a combination of down-sampling and frequency domain transformation are used to track the navigational satellite signals under dynamic environment. A Fast Fourier Transform (FFT) with long coherent integration has been employed to determine the varying frequency components with high resolution. By representing a number of correlation values with their average value, it is possible to represent a long sequence of input values by a smaller number of values and a relatively short length FFT can reveal the low frequency components that are present in the signal during tracking operation. A large reduction in the computational load may be achieved using this down-sampling method without compromising on the frequency resolution.
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