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During the last few years, there has been a rise in the use of nanosatellites because they offer a low cost and short development time alternative to larger satellites intended for long-duration missions. The use of commercial components (COTS) instead of the expensive space-grade components required for long missions is one of the main reasons of the popularity of the nanosatellites. This paper presents...
A digitalization scheme for multi-band GNSS receivers employing a single A/D converter for all signals is presented. Theoretical analyses are carried out, to compute the degradation in post-correlation signal to noise ratio due to joint filter and digitalization, in comparison to a classic scheme with separate A/D converters for each band. As a case study, a GPS and GLONASS L1 receiver is considered...
Recently, it has been shown that the electromagnetic interference generated by computer platforms like laptops, smart phones, tablets, or PDAs fits a double-sided K-distribution statistic. This kind of impulsive noise can severely degrade the performance of linear receivers intended for operation under additive gaussian noise. Therefore, we propose the use of a quasi-optimal detection scheme with...
A novel Bayesian technique for the joint estimation of real and integer parameters in a linear measurement model is presented. The integer parameters take values on a finite set, and the real ones are assumed to be a Gaussian random vector. The posterior distribution of these parameters is sequentially determined as new measurements are incorporated. This is a mixed distribution with a Gaussian continuous...
The design and implementation on an FPGA of a correlation system for the American and Russian Global Positioning Systems (GPS and GLONASS) receivers are presented in this paper. This system permits processing the received signal asynchronously with the data-bits. Typically, in GPS and GLONASS receivers, correlation channels receive the samples in intermediate frequency signal, process them through...
We present the design and implementation of a GNSS front-end intended for receiving the L1/E1 band of GPS/Galileo and GLONASS signals. The proposed scheme consists of a radio frequency (RF) stage, with a low noise amplifier which has a noise figure of 1.1dB. Then, the RF signals are down-converted to an intermediate frequency, where the GPS/Galileo and GLONASS bands are separated. Thanks to this separation,...
In this paper we present the implementation of a FPGA based high data rate BPSK receiver specifically designed to withstand the high dynamics of airborne vehicles (i.e. aircraft, sounding rockets, satellites, etc.). The carrier recovery is implemented through a Costas loop, and a Gardner detector is used for the timing recovery. This architecture was chosen because it provides almost independent carrier...
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