A A A
Maritime Systems

Port Security

From the beginning, Easat coastal radar antennas and systems have been rugged, COTS designs, developed in response to a small but growing market for long range surveillance radar for VTS, border security and law enforcement.

For this market, radar engineers in various organisations had concluded that the most important factors limiting the radar performance of conventional VTS radars was the low gain and limited resolution of the standard antennas used. Mostly the antennas were slotted wave guide (SWG) antennas, derived from shipboard navigational radars. That is, by replacing the standard low gain VTS antenna with a shaped beam, high gain high resolution antenna, having low side lobes and preferably with additional facilities such as polarisation control and dual band operation, so the overall radar performance would be greatly improved. This conclusion is valid irrespective of the type of radar transmitter and receiver, and is especially true for the low power marine magnetron systems on which most VTS systems are based.

Modern advances in signal processing can greatly improve the radar performance in rain or in rough seas, i.e. in clutter; signal processing techniques can do little to improve clear weather radar performance. All such improvements can do is to reduce the degradation of radar performance due to clutter.

A cost effective route is to continue the development of reflector antenna technology by optimising well-proven RF engineering principles with the latest numerical analysis and modelling methods; and to employ the best available magnetron radar transmitter/receivers derived from those supplied for marine navigational use, but with additional RF techniques such as the use of frequency diversity, switchable polarisation, and dual band operation.

Port Security Solutions
Port Security

(click photo to enlarge)


Port Security

(click photo to enlarge)

This is the Easat COTS approach, which to-day includes specially developed magnetron transceivers incorporating frequency diversity, together with unique advanced anti-clutter processing techniques.

The Easat philosophy is that for each end user has a unique set of operational requirements, unique topography, and unique constraints. Therefore, each VTS project requires an individual, customised system solution. A standard 'catalogue' solution may be sub-optimum.