This paper analyzes the effects of jitter on the GPS and Galileo navigation signals. Jitter effects have usually been modelled as additive noise, based on a sinusoidal input signal, and limits the achievable Signal-to-Noise Ratio (SNR). Analysis shows that psec-level jitter specifications are required in order to keep jitter noise well below the thermal noise for software radio satellite naviga...

GRINGO (GPS RINEX Generator) is a program which has been developed at the Institute of Engineering Surveying and Space Geodesy (IESSG) at the University of Nottingham, to record the pseudorange and full carrier phase data from 12-channel Garmin handheld GPS receivers, in standard RINEX (Receiver INdependent EXchange) format. It offers owners of these receivers the possibility of post-processing...

GPS and Galileo receivers must perform two dimensional searches, in time and in frequency, in order to acquire the correct code phase and correct Doppler frequency. Accurate and fast acquisition plays an important role in achieving reliable satellite-based positioning. When the code length is high (e.g., Galileo and modernized GPS), the searching strategy is of utmost concern for fast signal ac...

The atmospheric propagation of GPS signals under multipath conditions and their detection are simulated. Using the multiple phase screen method C/A-code modulated L1 signals are propagated through a spherically symmetric refractivity field derived from a high-resolution radio sonde observation. The propagated signals are tracked by GPS receivers implemented in software and converted to refracti...

[1] Snow is an important component of the climate system and a critical storage component in the hydrologic cycle. However, in situ observations of snow distribution are sparse, and remotely sensed products are imprecise and only available at a coarse spatial scale. GPS geodesists have long recognized that snow can affect a GPS signal, but it has not been shown that a GPS receiver placed in a s...

GNSS attitude determination has been widely used in various navigation and positioning applications, due to its advantages of low cost high efficiency. The modules the consumer market mostly use low-cost receivers face many problems such as large multipath effects, frequent cycle slips even loss locks. Ambiguity fixing is key will more challenges complex urban environment. Based on CLAMBDA algo...

Abstract Ionospheric scintillation refers to rapid and random fluctuations in radio frequency signal intensity phase, which occurs more frequently severely at high latitudes under strong solar geomagnetic activity. As one of the most challenging error sources affecting Global Navigation Satellite System (GNSS), can significantly degrade performance GNSS receivers, thereby leading increased posi...

The UNSW-designed GPS volcano monitoring system installed on Gunung Papandayan seeks to characterise the ground deformation within the volcanic edifice. Hourly baseline solutions produce a time series of data designed to detect any ground motion. Differential tropospheric effects between GPS receivers separated by a large change in height (in this case up to 1400m) impact on the quality of this...

Embedded GPS receivers have become commonplace with the proliferation of GPS navigation systems into all but the least expensive vehicle and cell phone lines. As more manufacturers embed low-cost GPS receivers in to their products, the need for low-cost GPS signal simulators have also grown. Controlled virtual testing is vital in ensuring the expected system performance. Many GPS signal generat...

Current generation military simulators are expensive, increasing costs for GPS test and evaluation for military GPS user equipment developers. Inexpensive commercial GPS simulators are available that use signal simulation, record and playback techniques to test receivers under representative environment, but these commercial record and playback GPS simulators do not have the bandwidth needed to...