This article investigates multicarrier (MC) transmission for next-generation global positioning system (GPS) instead of current spread spectrum signals. A MC code is proposed in this article as an alternative to the coarse/acquisition (C/A) code in GPS. The entire GPS bandwidth for the C/A code is divided into 1,024 subcarrier slots. As per our proposed arrangement, each satellite vehicle (SV) ...

Soil moisture (SM) is a highly relevant variable for agriculture, the emergence of floods and a key variable in the global energy and water cycle. In the last years, several satellite missions have been launched especially to derive large-scale products of the SM dynamics on the Earth. However, in situ validation data are often scarce. We developed a new method to retrieve SM of bare soil from ...

A new navigational signal designated as L5 with a center frequency of 1176 MHz and a bandwidth of 20 MHz has been introduced as part of GPS Modernization. This new signal is in the Aeronautical Radio Navigation Service Band and will primarily benefit aviation users by allowing precision navigation when used with the existing L1 signal for ionospheric corrections. In addition, U.S. military user...

A circularly polarized single feed microstrip slot antenna has been introduced in this paper as a candidate for use in GPS applications. The slot structure of the proposed antenna has been created on the radiating patch in two steps. At first, a 45 degree rotated square has been etched at the center of the patch, and then a Sierpinski gasket type of the 3rd iteration occupies the resulting slot...

This paper investigates the accuracy of a GPS device. The GPS accuracy is treated as a pattern recognition problem. Each location estimate is classified into a certain accuracy class. Various observation conditions provided by the GPS device are used as features relating a location estimate to an accuracy band. In this paper we introduce an evidence-based classifier (EBC) in which three indepen...

Context. This paper presents the X-ray properties of a fluxand volume-limited complete sample of 16 Giga-Hertz Peaked Spectrum (GPS) galaxies. Aims. This study addresses three basic questions in our understanding of the nature and evolution of GPS sources: a) What is the physical origin of the X-ray emission in GPS galaxies? b) What physical system is associated with the X-ray obscuration? c) W...

Ultra Wide Band (UWB) technology is based on very short pulses of radio energy. In theory, its wide signal bandwidth yields excellent multipath immunity. Hence, UWB has been used in a variety of applications, including communication and ranging, and is expected to see increased use in the future. Since signals from GPS satellites have very low power levels (-130 dBm or -160 dBW) near the surfac...

In this research article, a single-fed dual-band circular polarized (CP) dielectric resonator antenna (DRA) for dual-function communication, such as GPS and WLAN, was made. Initially, the proposed design process initiated by designing linearly singly fed-DRA. To attain CP fields, cross-shape conformal metal strip optimized to excite fundamental high-order mode in two frequency bands. The metall...

The increasing use of wireless communication systems, demands antennas for different systems and standards, with properties like broadband, compact, multiple resonant frequencies. The previous chapter discussed the analysis and fabrication of two single frequency EBG antennas. This chapter deals with the design and fabrication of a dual frequency EBG antenna. The bandwidth improvement of a comp...