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首页> 外文会议>Proceedings of the 22nd international technical meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2009) >A Complexity Reduced Frequency Domain Receiver for Galileo and GPS L1 Signals
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A Complexity Reduced Frequency Domain Receiver for Galileo and GPS L1 Signals

机译：伽利略和GPS L1信号的复杂度降低的频域接收器

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摘要

The L1/E1 band will soon be populated with four different signals,namely the GPS L1 CA code,L1C code,Galileo E1B code and E1C code.The frequency domain receiver, which can provide parallel correlation and process all the signals in a common structure,becomes a promising solution for multi-code and multi-modulation processing. However,the conventional frequency domain receivers require quite high computational capacity to perform the FFT and IFFT operations,especially when the receivers operate at a high sampling rate.The high computational complexity would exert a negative effect on the size, power consumption,and cost of the receiver. rnTo reduce the computational complexities of the frequency domain receiver,a new correlation method with signal down sampling in the frequency domain is proposed in this paper.The down sampling is achieved by pruning the high frequency parts of the signal spectrum and then performing IFFT in a smaller size.The correlation gain loss will be small because the pruned spectrums contain little energy. The results show that the correlation gain losses of BPSK (1)and BOC(1,1)are less than 0.4dB with a sampling rate of 16.384MHz,while the operations in the IFFTs can be reduced to 40%of the conventional method with original sampling rate of 40MHz.And because the IFFTs are the most computationally consuming parts in the frequency domain receiver,the new method can significantly reduce the computational load by reducing the IFFT size. rnIn addition,because the closed code delay tracking loop cannot be applied in the frequency domain receivers directly,a correlation interpolation method,which can produce the EPL correlation as in the time domain receiver, is then usually applied in the existing frequency domain receivers.But the interpolation method will lead to extra operations.In this paper,a novel open loop code delay estimation method without correlation interpolation is also proposed.The method first obtains the integer parts of the code delay by the correlation peak detection,then gets the residual errors by code delay discrimination and finally obtains the precise estimation by post filtering.The results indicate that this new method not only reduces the complexity,but also improves the tracking sensitivity comparing to the conventional closed tracking loops.
机译：L1 / E1频段很快将填充四个不同的信号，即GPS L1 CA代码，L1C代码，伽利略E1B代码和E1C代码。频域接收器可以提供并行相关性并以通用结构处理所有信号，成为多代码和多调制处理的有前途的解决方案。然而，常规的频域接收机需要很高的计算能力才能执行FFT和IFFT操作，尤其是当接收机以高采样率运行时。高的计算复杂度会对尺寸，功耗和成本产生负面影响。收件人。为了降低频域接收机的计算复杂度，本文提出了一种在频域中进行信号下采样的新相关方法。下采样是通过对信号频谱的高频部分进行修剪，然后对信号频谱进行IFFT来实现的。由于修剪后的频谱几乎没有能量，因此相关增益损失将很小。结果表明，BPSK（1）和BOC（1,1）的相关增益损耗小于0.4dB，采样率为16.384MHz，而IFFTs中的运算可以减少到传统方法的40％。原始采样率为40MHz。由于IFFT是频域接收机中计算量最大的部分，因此该新方法可以通过减小IFFT大小来显着降低计算量。 rn此外，由于闭合码延迟跟踪环路无法直接应用于频域接收器，因此通常会在现有频域接收器中应用一种与时域接收器一样可以产生EPL相关性的相关插值方法。本文还提出了一种新的无相关插值的开环码时延估计方法。该方法首先通过相关峰检测得到码时延的整数部分，然后得到残差。实验结果表明，与传统的闭环跟踪相比，该方法不仅降低了复杂度，而且提高了跟踪灵敏度。

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