Spin-scan and conical-scan tomographic scanning (TOSCA) imagers have produced good-quality and costeffective images and video in both the infrared (IR) and optical wavelengths. A novel rosette-scan implementation of TOSCA single-pixel imaging is presented below. Previous conical-scan TOSCA imagers implemented a reticle with a fixed number of thin slits. This resulted in a fixed angular resolution which implied a fixed image resolution. The feasibility of a rosette-scan implementation using similar processing techniques to conical-scan TOSCA imagers will be demonstrated. The rosette-scan implementation would only require a reticle with a single thin slit, instead of a reticle with a number of thin slits at fixed angles. The single thin-slit reticle can be rotated to be perpendicular to the line-scan angle of each rosette petal. The number of scan angles can be dynamically changed to achieve different trade-offs between resolution and frame rate by varying the rotational speeds of the prisms and the single thin slit reticle.
There remains a wide proliferation of second-generation frequency-modulated conical-scan seekers in the hands of irregular forces while the understanding of what makes a jam signal effective remains unclear. It is generally known that the jam-to-signal (J/S) ratio, the jam signal frequency, and the duty cycle are the parameters that need consideration when developing an effective jam code, but the effect of using different jammer waveforms is not generally known. Our study investigates the effect of using different jammer waveforms namely: the fixed carrier, low frequency, amplitude modulation (AM), and frequency-modulation jam codes, for jam signal analysis. Of the tested jam signals, it was found that the AM jam code is most effective in countering the conical-scan seeker due to the amplitude variations created by the jam signal.
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