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RAL Space and its project partner PRG are tasked with providing space-qualified heterodyne receiver front-ends operating between 165.5 GHz and 325 GHz for the Microwave Sounder (MWS), the Microwave Imager (MWI) and the Ice Cloud Imager (ICI) of the MetOp Second Generation (MetOp-SG) series of satellites. The preliminary design of the receiver front-ends is now complete. Extensive tests on performance...
A limiting factor of GaAs Schottky diodes used as mixers in heterodyne receivers is their high intrinsic noise when compared to SIS or HEB devices. This work presents results on the numerical optimization of fundamental Schottky diode mixers, results which predict a significant improvement in the noise performance of current Schottky mixer technology in the THz band. The optimization of the Schottky...
Global Navigation Satellite System (GNSS) will in effect be fully deployed and operational in a few years, even with the delays in Galileo as a consequence of European Union's financial difficulties. The vastly broadened GNSS spectra, spread densely across 1146–1616 MHz, versus the narrow Global Positioning System (GPS) L1 and L2 bands, together with a constellation of over 100 Medium Earth Orbit...
This paper describes the challenges associated with recovery of multi-GHz short burst communications in multi-channel systems, especially DWDM optical packet switching networks. Burst-mode data transmission complicates the standard methods typically used to recover embedded clock information and recover the serial data. Previously implemented solutions to this problem either constrain the test capability...
This paper presents the development of a 60GHz millimeter-wave life detection system (MLDS) by using V-band waveguide components for remote human vital-signal sensing. A clutter canceller is implemented in the system with an adjustable attenuator and phase shifter for the clutter cancellation for the transmitting power leakage from the circulator and background reflection to enhance the detecting...
In this paper, focusing on identifying standards blindly, we propose a bandwidth shape sensor and a GI (guard interval) sensor using USRP (Universal Software Radio Peripheral) platforms and SDR4all tools. These sensors are fundamental parts of the so-called Blind Standard Recognition Sensor. The blind standard bandwidth sensor is based on a Radial Basis Function Neuronal Network designed in Matlab...
Recent studies on 1.3 mum InGaAs/GaAs QD-SOAs show they are able to deliver >18 dB gain across a 20 to 70degC temperature range. Successful system demonstrations over temperature are reported at channel rates of 10 Gb/s.
L symmetric multiple descriptions of a vector Gaussian source with two levels of receivers is investigated, where the first level receiver can receive any k descriptions (k<L) and the second level receiver can receive all descriptions. Both receivers need to reconstruct the vector Gaussian source subject to covariance distortion measure constraints, in a positive semidefinite ordering. The symmetric...
The first monolithic integrated photodetector-preamplifier implemented with GaAs/GaAlAs heterojunction phototransistor and transistors has been fabricated and tested. This photoreceiver has been designed for local networks of optical transmission links operating at 0.85 ?m wavelength with multimode fibres. A heterojunction phototransistor (HPT), two heterojunction bipolar transistors (HBTs) and four...
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