Willtek provides measurement systems to survey RF fields and investigate the characteristics of RF channels used in mobile and PMR communication systems. Our equipment has been designed to meet all of the RF surveying needs of a mobile operator, from initial CW surveys through prediction model calibration to detailed problem investigation and network optimisation. The Willtek series of receivers are designed to measure the following properties of an RF field.
Log normal field variation The RF field from a transmitter falls slowly with distance from the transmitter following a log normal curve. This is the underlying RF field that is predicted from RF prediction tools. In practice the field does not follow the log normal curve due to effects such as shadowing, clutter attenuation etc. this is why the field is measured to determine what it really is and hence how accurate the prediction. Measurements can be distance based to meet Lee or Parson's criterion.
Multipath Multipath due to reflections from the various objects causes variation in the observed RF field. These variations tend to change rapidly with distance. They act as ‘noise’ on the measurement of the underlying log normal field. Measurements of the multipath (short-term) fading are made to determine the actual variations in the RF field. These measurements identify the statistical characteristics of the fast fading channel.
Channel Occupancy Channel occupancy measurements determine whether an RF channel is in use or not by setting an RF level as the threshold.
These are just the receivers. Willtek also offers software solutions to help collect RF propagation measurements.
Network deployment Our powerful software provides cost-effective capture and analysis of drive test data. It can help network operators plan and measure the capabilities of base transceiver stations in preparation for the deployment of new technologies such as TETRA, GPRS and UMTS.
Data analysis Willtek’s software also offers intelligent data analysis functionality and easy-to-use, flexible report and export functions. Export to several planning tools is already available. Use GPS or route tracing function to display maps using the built-in geographical Information System (GIS). Display results in real-time or replay later.
Network maintenance Test and optimise mobile phone networks. Analyse the quality of the air interface to the serving and neighbouring cells. Force handovers and simulate a single band phone.
