Abstract
The detection of low received power of global positioning system (GPS) signals in the signal acquisition process is an important issue for GPS applications. Improving the miss-detection problem of low received power signal is crucial, especially for urban or indoor environments. This paper proposes a signal existence verification (SEV) process to detect and subsequently verify low received power GPS signals. The SEV process is based on the time-frequency representation of GPS signal, and it can capture the characteristic of GPS signal in the time-frequency plane to enhance the GPS signal acquisition performance. Several simulations and experiments are conducted to show the effectiveness of the proposed method for low received power signal detection. The contribution of this work is that the SEV process is an additional scheme to assist the GPS signal acquisition process in low received power signal detection, without changing the original signal acquisition or tracking algorithms.
Highlights
IntroductionNavigation is done worldwide, with the aid of the global positioning system (GPS) receivers
Today, navigation is done worldwide, with the aid of the global positioning system (GPS) receivers.More than 400 million people worldwide rely on the satellite navigation to deliver the position, velocity, and time (PVT) information
The proposed approach is capable of detecting and verifying the satellite signal with low received power even if the estimated code delay information has an offset of half a chip from the correct one
Summary
Navigation is done worldwide, with the aid of the global positioning system (GPS) receivers. The block acquisition method uses a predetection and integration time of 20 milliseconds, and subsequently formed 20 different accumulation parts, where each corresponds to a possible bit transition As a result, this approach could acquire a weak signal with carrier-to-noise ratio (C/N0) as low as 21 dB-Hz. Yu and Zheng et al in 2006 [7] proposed a differential combining (DFC) method for acquiring the weak GPS signal. The SEV process is developed based on the time-frequency analysis [10], and it can detect the characteristic of the low received satellite signal on the generated spectrogram of the satellite signal. The acquisition performance of the low received power GPS signal could be enhanced with the aid of the proposed SEV process, and the number of acquired GPS satellites could be increased to continue the navigation service for users in urban or indoor environments.
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