Fratricide preventign friend identification tage based on Photonic Band Structure coding

摘要

A new friend foe identification tage based on photonic band structure (PBS) is presented. The tage utilizes frequencycoded radar signal return. Targets that include the passive tage responds selectively to slightly different frequencies generated by interrogating MMW radar. It is possible to use in- and out-of-band gap frequencies or defect modes of the PBS in order to obtain frequency dependent radar waves reflections. This tag can be made in the form of patch attachable such as plate or corner reflectors, to be worn by an individual marine, or to be integrated into the platform camouflage. Ultimately, it can be incorporated as "smart skin" of a ground or airborne vehicle. The proposed tag takes full advantage of existing sensors for interrogation (minimal changes required), it is lightweight and small in dimensions, it operates in degraded environment, it has no impact on platform vulnerability, it has low susceptibility to spoofing and mimicking (code of the day) and it has low susceptibility to active jamming. We demonstrated the operation of the tag using multi-layer dielectric (Duroid) having periodic structure of metal on top of each of the layers (metal strips in this case). The experimental results are consistent with numerical simulation. The device can be combined with temporal coding to increase target detection and identification resolution.