Acquisition of weak GNSS signals based on non-coherent integration

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Abstract

When antennae are blocked by buildings or the signals are drowned by strong noise, global navigation satellite system (GNSS) receivers require both long coherent integration times and a large number of non-coherent integration operations to acquire the signal. However, navigation data bit transition during the long coherent integration results in integrator signal energy attenuation and non-coherent integration will have squared losses that limit the ability to acquire weak signals. A signal acquisition algorithm is given here based on non-coherent integration that estimates the optimal combination of navigation data bits with the maximum energy criterion to eliminate the length limit and improve the ability to acquire weak signals. Tests demonstrate that these techniques greatly increase the gain such that low signal to noise ratio (SNR) signals as low as 20 dBHz can be successfully acquired.

Keywords non-coherent integration weak signal optimal navigation data acquisition capability

Issue Date: 15 June 2014

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	Lungui ZHENG
	Zheng YOU
	Gaofei ZHANG
	Shumin ZHAO

Cite this article:

Lungui ZHENG,Zheng YOU,Gaofei ZHANG, et al. Acquisition of weak GNSS signals based on non-coherent integration[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(6): 794-798.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I6/794

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