Modern naval platforms are some of the harshest electromagnetic environments known to the EW community. Radars, high-power communications, signal interception and direction-finding systems are all to be installed on the same platform. Normally each of these vying for the highest spot on a severely over-crowded central communications tower with more critical systems always finding their…
“I am not sure anyone watching TV in December 2019 had any idea that the coverage on Wuhan would cause the change and disruption to life and business as it has,” said Claire Nitch, Head of Sales and Marketing of Alaris Antennas. In a couple of months, everyone had to adapt to massive changes to…
In the previous two blog posts we discussed some of the effects that could influence the sensitivity of a DF antenna system. These were mostly related to the environment, and often manifests in a DF measurement as noise or interference which reduces the ability of the DF system to accurately estimate the angle of arrival….
By Johan Fuhri, Product Owner In the previous blog post we considered some of the ways in which we can express the performance of an DF antenna, and we noted that simply stating the ‘accuracy’ of a DF antenna is not quite that simple. We also noted that there are various algorithms that can be…
By Johan Fuhri, Product Owner Part 1: Accuracy and Sensitivity It is sometimes said that: “If you can’t convince them, confuse them!”. Nowhere is this more apparent than the minefield which is antenna datasheets and brochures. Direction finding antennas are meant to be instrumental in accurately determining the direction of an incoming signal, that much…
By Eugene Botha and Kalinka Faul Humans do audio direction finding to a remarkable precision of less than two degrees. Shortly after the development of radio transmitters and receivers, radio direction finding (RDF or just DF) evolved for much the same reasons as human audio direction finding: firstly, for the location of possible threats and…
By Johan Fuhri Antenna Principles High-Gain Omni-directional antennas are used in situations where the direction of the receiving antenna is not static or known. A typical situation is where antennas are mounted on a mobile platform like a vehicle or vessel. In any communication system, the quality and throughput that can be attained through a…
Multiple LPDA Antennas Written by Johan Fuhri Introduction One of the questions we often get asked at Alaris Antennas, is the question of spacing between multiple LPDA antennas on the same mast. Often, this question is related to situations where the space on the mast is limited (mobile or tactical application) and where high-power transmitters…
High Power Transmit Antennas on Vehicles Written by Johan Fuhri Introduction Many of the Alaris Antennas products are used in vehicle-based high power transmit systems, a typical application being the protection of convoys or VIP transport vehicles against remotely triggered improvised explosive devices (IED)s. Since the performance of the antenna will directly influence the effectivity…
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