modelling and simulation

Modelling and simulation

Using programs such as MATHCAD and PSPICE, it is possible to model virtually any electrical engineering problem providing the system can be described mathematically. Specialised models and simulations have been developed for Customers, where no commercial tools were available. The following projects have been undertaken:

Prediction of phase and amplitude inbalance effects in a gradiometer antenna

Prediction of VCO non linearity effects and bandwidth limitations in a swept synthesiser for a fast scanning receiver

PSPICE evaluation of mutual coupling in close coupled RFID (magnetic) circuits

Fresnel zone clearance calculations

Okumura-Hata path prediction

Model of ringing artefacts in a SAW based transducer

Inverse Chirp Z and IFFT transforms for frequency to time domain conversion in radar systems

An example using MATHCAD (Mathsoft Inc) to demonstrate the

inverse chirp-Z transform of stepped-FMCW radar data. The model allows the effects

of dispersion and band limitation to be observed on the range data

Another example to simulate oscillations and triple transit time in a SAW-based strain sensor.

The effect was noted practically during trials and the model developed to confirm the

measured response was due to ringing in the sensor itself

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Communications projects

Contact details:

JWD Ltd

Telephone/Fax: +44 (0)1403 261251, Mob: 07973 173808

email:

julian @ jwdltd.demon.co.uk