量化对GPS接收机捕获性能影响的研究

由于接收机输入端的信噪比对接收机的捕获性能具有很重要的意义,所以要尽量减少接收机输入端信噪比的损失。本文首先给出了含高斯白噪声的GPS信号经过不同量化位数和量化电平的量化器后的输出信噪比计算公式;然后,在此基础上分析其对接收机捕获性能的影响;最后,仿真实验表明,接收机可以在不影响捕获性能的情况下,尽量选择合适的量化位数和量化门限。实验结果也为量化器的设计提供了重要的技术参考。

Research of Quantization Influence on Acquisition Performance of GPS Receiver

Because the input SNR of receiver has an important significance for the receiver acquisition performance, it must reduce as much as possible the loss of receiver input SNR.In this paper,firstly,the calculation formulas of outputs SNR for the GPS signals with white Gaussian noise quantized by AD quantizers with different quantization bit number and quantization level are given.Then,on this basis,the influence on the acquisition performance of receiver is analyzed.Finally,the results of the simulation experiments on software GPS receiver show that GPS receiver can choose most appropriate quantization bit and level without affecting acquisition performance.And the results also provide the useful technical parameters for the quantizer design.