According to APA, this system was tested/demonstrated to give F-18 passive ranging capability rival that of ASQ-213. I find it particularly interesting since it appear that this is the only ESM system on tactical fighter that can measure not only the azimuth of the threat but also the elevation (even ASQ-239 on F-35 is an azimuth only system). Unfortunately, I can’t find any additional information about this system apart from a paragraph on APA
