This research evaluates the quality of GPS signals and their usability for localization in urban environments. GPS signals collected on a Software Defined Radio (SDR) platform in urban canyons in Columbus, Ohio (USA) are processed using a deeply integrated GPS/INS scheme. This architecture allows for coherent signal integration with continuous carrier phase tracking for intervals as long as one...

This study presents an ultracompact dual-band bandpass filter with controllable transmission zeros based on quarter-wave dual-mode resonator for GSM (global system mobile communications) and GPS positioning system) wireless applications. The is made up of two resonators, which help to independently control the passbands. A direct feed creates first operating band, serves as a feeding source int...

Abstract We report on the multi-frequency multi-epoch radio observations of magnetar XTE J1810−197, which exhibited a outburst from 2018 December after its 10-year quiescent period. performed quasi-simultaneous with VERA (22 GHz), Hitachi (6.9 GHz and 8.4 Kashima (2.3 Iitate (0.3 GHz) telescopes located in Japan to trace variability pulsations during observing period 13 2019 June 12. The pulse ...

A new shaped circularly polarized dielectric resonator antenna (CP DRA) is studied with branch-line coupler and log-periodic balun for the GPS application. Since the coupler and balun are located under the DRA, it does not increase the footprint of the antenna, as a result the system is very compact. Two configurations are considered in this paper. In the first configuration, an external 50Ω lo...

Japan‟s first Quasi-Zenith Satellite (QZS-1) "Michibiki" has began transmissions in the last quarter of 2010. This has provided an opportunity across South-East Asia and Australia to investigate live QZSS signals. QZS-1 transmits 6 signals across 4 frequency bands, most of which are compatible with current and modernised GPS signal structures. Michibiki is the first satellite to transmit GPS-li...

GNSS receivers have been shown to be most vulnerable to CW interference. It affects the acquisition process of the signal and can also pass through the tracking loop filters to affect the received satellite signal quality. Carrier to noise density ratio (C/No) is an indicator of received signal quality to the receiver. Lower C/No means lower quality of the received signal. Galileo satellites wi...

GPS timing receivers have been used for synchronizing telecommunications equipment since the early 90’s, currently providing an accuracy of up to 10ns. Such a high requirement of accuracy demands excellent operation from GPS timing receivers, avoiding the degradation of the synchronization process. Interference is an important threat to GPS performance. Such harmful interfering signals can orig...

The Korean nationwide differential global positioning system (NDGPS) reference station transmits a global positioning system (GPS) enhancement signal using minimum shift keying modulation with a 200 bps data rate. The ocean-based DGPS covers the service area of 100 NM with 300 W output power; on the other hand, the land-based DGPS transmits the output power of 500 W, which covers the service ar...

An automatic steering controller was installed on a Case-IH Model 7220 tractor. The primary posture sensor was a kinematic differential GPS. Open loop and closed loop frequency response tests were conducted to evaluate the steering controller dynamics. A double integrator transfer function adequately related vehicle lateral deviation to steering angle within the frequency range of 0.04 Hz to 0....