Ground-penetrating radar (GPR) has been extensively utilized in deep-space exploration. However, GPR modeling commonly employs simplified antenna models and carrier-free impulse signals, resulting reduced accuracy interpretability. In this paper, we addressed these limitations by combining a tilted monopole linear frequency modulation continuous wave (LFMCW) to simulate real conditions. Additio...

As one of the important structures composite materials, polymethacrylimide (PMI) foam sandwich structure is prone to debonding and delamination defects during manufacturing service, which seriously affects mechanical properties materials. Therefore, it necessary detect structure. A linear frequency modulation infrared thermal wave nondestructive testing system was built study correlation betwee...

Frequency shift keying (FSK) signal has been widely used in modern radar systems. To intercept the FSK with a high interception probability, reconnaissance receiver should have an ultra-wideband receiving ability. The Nyquist folding (NYFR) is novel non-cooperative and it requires small amount of equipment. When intercepted by NYFR, corresponding output hybrid modulation signal. Therefore, nece...

Bats use frequency-modulated echolocation to identify and capture moving objects in real three-dimensional space. The big brown bat, Eptesicus fuscus, emits linear period modulation sound, and is capable of locating static objects with a range accuracy of less than 1 μs. A previously introduced model can estimate ranges of multiple, static objects using linear frequency modulation (LFM) sound a...

An approach to the joint estimation of sine-wave amplitude modulation (AM) and frequency modulation (FM) is described based on the transduction of frequency modulation into amplitude modulation by linear filters, being motivated by the hypothesis that the auditory system uses a similar transduction mechanism in measuring sine-wave FM. An AM-FM estimation algorithm is described that uses the amp...

The frequency behavior of the tunnel injection quantum dot vertical cavitysurface emitting laser (TIQD-VCSEL) is investigated by using an analyticalnumericalmethod on the modulation transfer function. The function is based on therate equations and is decomposed into components related to different energy levelsinside the quantum dot and injection well. In this way, the effect of the tunnelingpr...