Browse Conferences
Traceability-the national roles
Traceability is defined as a process whereby a measurement is compared to national standards by an unbroken chain of comparisons. The author discusses a traceability hierarchy in the UK which puts the industrial base as being supported by a...
Customer requirements for electrical calibrations
The author attempts to explore the different requirements placed upon calibration laboratories by their customers. In addition the limitations imposed by the accreditation bodies and their subsequent implications are discussed.<<ETX xmlns:m...
Calibration of signal generators
There are a number of different measurement parameters in the field of radio frequency calibration. In order to provide a comprehensive measurement capability, the RF calibration laboratory must have the equipment and expertise to deal with...
RF power-review of current techniques for power sensor calibration
The traceability for RF power measurements in the range 100 kHz to 26.5 GHz is normally achieved by NAMAS accredited laboratories using thermocouple power sensor calibrated by SESC. This system has given adequate uncertainties over the past...
Modulation: fundamental techniques for traceability
Basic methods used to measure amplitude modulation are discussed. These include: oscilloscope slideback method; spectrum analyser method; analogue switch method; and Bessel-zero method.<<ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xm...
A method for assessing the magnitude uncertainties associated with network analyser measurements
Without correction, errors present within an automatic network analyser (ANA) will significantly affect the response of a measurement, resulting in a misleading representation of the parameter measured. By calibration (i.e. applying error c...
Guidance on the use of coaxial connectors in radio frequency and microwave circuits
The author suggests that coaxial connectors are often the most mistreated and ignored part of a measurement system. NAMAS have produced a coaxial connector guidance publication number NIS4303 to give information to NAMAS Accredited Laborato...
Accreditation of r.f. measurements: the future
In the field of electromagnetic compatibility (EMC) testing, including r.f. testing, approximately 30 NAMAS-accredited laboratories exist in 1993. These numbers reflect the business realities of demand for, and cost of, providing accredited...
Robust MVDR beamforming using the DOA matrix decomposition
The minimum variance distortionless response (MVDR) beamformer is very sensitive to errors, such as the the finite snapshots and the steering vector errors. A small mismatch can lead to serious degradation to its performance, especially at ...
Direction estimation of uncorrelated and coherent narrowband signals with uniform linear array
In this paper, an effective direction-of-arrival (DOA) estimation method is proposed with a uniform linear array (ULA) when uncorrelated and coherent signals coexist. The direction-of-arrivals (DOAs) of uncorrelated signals and coherent sig...