A S CMOS technologies continue to enjoy the bene ts of aggressive scaling, they become increasingly attractive for use in wireless receivers. Peak device fT 's on the order of 15GHz are available with 0.5 m CMOS devices, making possible CMOS implementations of radio receivers in the 1-2GHz frequency range. One wireless system in this range that is particularly amenable to integration is a Globa...

In order to be able to be process GPS data, the GPS signal it has to pass the entire terrestrial atmosphere – both neutral atmosphere and ionosphere – which may cause an alteration of the GPS receiver to perform, resulting in large errors in the final position estimate. The dual frequency GPS receivers are affected by the influence of the atmosphere, especially by the troposphere. To estimate t...

Abstract: The availability of GLONASS would bring significant benefits to geodetic applications of global positioning systems. GPS and GLONASS observations could be combined directly in the data processing; as a result, the geometry of observed satellites could be enhanced by increasing the number of available satellites. Up to now, with the recent revitalization of GLONASS, more high precision...

Common-View GPS has proven to be an accurate and reliable time transfer method capable of producing estimates of clock differences with a precision of 2-3 nanoseconds with averaging'. The advent of multichannel timing receivers promises enhanced coverage and increased precision due to the large number of common-view passes available between any two sites. This paper discusses the processing tec...

C urrently in development, numerous geolocation technologies can pinpoint a person's or ob-ject's position on the Earth. Knowledge of the spatial distribution of wireless callers will facilitate the planning, design, and operation of next-generation broadband wireless networks. Mobile users will gain the ability to get local traffic information and detailed directions to gas stations, restauran...

The ephemeris data format of legacy GPS receivers is improper for positioning stationary pseudolites on the ground. Therefore, to utilize pseudolites for navigation, GPS receivers must be modified so that they can handle the modified data formats of the pseudolites. Because of this problem, the practical use of pseudolites has so far been limited. This paper proposes a pseudolite-based position...

Satellite navigation has emerged to be one of our every-day technologies, like wireless communication. The U.S. based Global Positioning System, better known as GPS, was the first system to serve civilian users. Today, GPS is under modernization, Europe has devoted a lot of effort to build their own system, called Galileo, and activities around Russian GLONASS system are also being re-initiated...

The Global Positioning System (GPS) is the most widely used navigation system in land vehicle applications. In urban areas, the GPS suffers from insufficient signal strength, multipath propagation and non-line-of-sight (NLOS) errors, so it thus becomes difficult to obtain accurate and reliable position information. In this paper, an integration algorithm for multiple receivers is proposed to en...

Very-narrow-band Global Positioning System (GPS) receivers have recently been proposed in order to help mitigate the eflects of scintillation. This paper will revisit the stability requirements placed on the local oscillator of such receivers. INTRODUCTION The need to have good local oscillator shortand medium-term stability for phase tracking receivers has been well documented, especially for ...