High Sensitivity Gnss Receiver

Global Navigation Satellite System(GNSS) has got great success in the21stcentury. GPS receivers are now found on cellular phones, automobiles, and innumerableother devices. Some companies reveal single chip with WiFi, GPS, FM and Bluetoothin a space-saving platform for mobile phones. Its usage has become widespread and isnow a ubiquitous Feature in many people’s lives. Some applications exist inenvironment that attenuate GNSS signals, and, consequently, the received GNSS signalsbecome very weak. This paper focuses on the development of efficient GNSS receiveralgorithms to work with weak signals under various dynamic conditions.In order to track and decode the information in GPS signals, an acquisition methodmust first be used to detect the presence of the signal. Once the signal is detected, thenecessary parameters can be obtained and transmitted to a tracking program. Then, thenavigation data can be extracted from the tracking program. The acquisition of weakGPS signals is a challenging problem. The current methods for acquisition of weak GPSsignals mainly depend on aiding, in which the GPS receiver needs priori informationfrom base-station to promote weak GPS signal acquisition and tracking. It is unavailablein some remote locations since the area may not be covered by the base-station. Also,in the state-of-art unaided GPS receivers, the weak GPS signals acquisition requireslong Pre-detection Integration Time (PIT), which means the computation is complexand time-consuming. This paper proposes a computational efficient method to speed upacquisition operations. Finally, we evaluate the efficiency of the method throughsimulations. In order to validate the availability of our algorithms in real worldapplication, we receive the GPS signal by using our receiver to verify our algorithm.The simulation results show that this technique can improve the whole performance ofGPS receivers.