This paper presents a method to derive local sea level variations using data from a single geodetic-quality Global Navigation Satellite System (GNSS) receiver using GPS (Global Positioning System) signals. This method is based on multipath theory for specular reflections and the use of Signal-to-Noise Ratio (SNR) data. The technique could be valuable for altimeter calibration and validation. Da...

The Wide Area Augmentation System (WAAS) became operational on July 10, 2003. Currently this system provides en-route through non-precision approach guidance. Further, the signals are capable of providing vertical guidance to bring an aircraft within 250 feet of the ground. WAAS offers significant benefit to both aviation and non-aviation users. However, the vertical guidance availability is vu...

Narrowband and partial-band interference can severely degrade the performance of GPS receivers. The use of digital signal processing in a receiver has been shown to provide protection against this type of interference in communications systems and has been proposed for application in future GPS systems. This paper discusses the measured effects of narrowband interference suppression on GPS rece...

UAVs are increasingly being used outdoors for surveillance, exploration, search, rescue and other purposes. A good position estimate allows us to precisely navigate and avoid objects, thus maximising the potential of autonomous applications. There is a growing need for an inexpensive, high performance GPS solution providing better accuracy and robustness. In this paper we incorporate measuremen...

The Global Positioning System is fruit of those studies which became able to use the L band of carrier phase (frequency microwaves around 1 up to 3 Ghz and wave length close to 23 cm) for calculating the spatial trilateration. Therefore, in 1978 began the launch of the first NAV‐ STAR (Navigation Satellite with Time and Ranging) satellites – the begging of GPS as is known today. Due to the high...

With the recent completion of the Global Positioning System constellation and the appearance of increasingly affordable spaceborne receivers, GPS is moving rapidly into the world of space flight projects. Indeed, owing to the great utility and convenience of autonomous onboard positioning, timing, and attitude determination, basic navigation receivers are coming to be seen as almost indispensab...

Logan Scott is a consultant specializing in radio frequency signal processing and waveform design for communications, navigation, radar, and emitter location. He has more than 25 years of military GPS systems engineering experience. As a senior member of the technical staff at Texas Instruments, he pioneered approaches for building high-performance, jammingresistant digital receivers using larg...

This paper presents Kalman filter design which has been programmed and evaluated in dedicated STM32 platform. The main aim of the work performed was to achieve proper estimation of attitude and position signals which could be further used in unmanned aerial vehicle autopilots. Inertial measurement unit and GPS receiver have been used as measurement devices in order to achieve needed raw sensor ...