51 results about "Incoherent scatter" patented technology

The invention discloses a phased-array incoherent scattering radar system. An excitation source signal is generated through a digital receiver and is sent to N transmit-receive switches through a power divider to be pre-amplified, the output, with certain power magnitude, of each transmit-receive switch is fed back to each set of N transmit-receive assemblies through the power divider, the N transmit-receive switches drive the N*N transmit-receive assemblies to work at the same time to carry out final stage amplification on an emitting signal, the N*N transmit-receive assemblies feed the final output power back to N*N antenna sub-arrays, each antenna sub-array is internally provided with an antenna unit, all antenna units are driven through the power divider and send incident waves, the incident waves are scattered towards different directions through atmospheric plasma, the antenna units feed inducted echo signals to a reception channel, the inducted echo signals are amplified through the transmit-receive assemblies and are synthesized again through the synthesized function of a feeder system, and one loop of echo signals are formed at last and input to the digital receiver in sequence to be processed through a signal processing device. At last, the echo signals are output to a master control computer to enable the master control computer to process and synthesize products.

The invention discloses a non-coherent scattering radar signal processing method based on frequency hopping and multiphase alternate codes. The method mainly solves the problems that existing non-coherent scattering radar is low in height resolution ratio, long in detection period and limited in coding mode. According to the technical scheme, the method comprises the following steps that all sets of the multiphase alternate codes are modulated respectively according to different frequencies, and radar pulses arranged in sequence without any time slot are generated and transmitted through a radar transmitter; radar echo signals are filtered respectively according to transmitting modulation frequencies so as to obtain detection data, corresponding to the same height range, of all the sets of the multiphase alternate codes, post-detection filtering is carried out on each set of coding echo signals, a self-correlation function is worked out, multi-period accumulation and fuzzy revising are carried out, and therefore the power spectral density of scattered signals of an ionized layer is worked out. The method can increase the height resolution ratio of the radar, shorten the detection period of the radar, expand the signal coding modes and be used for detection of the ionized layer.

An interferometric and synthetic aperture THz incoherent imaging system is provided, in which a high-power electronic source such as a 0.094 THz Gunn Oscillator is integrated with a continuous-wave (CW) terahertz detection system in order to achieve a high signal-to-noise ratio. THz imaging of a point source located 10 m away from the detector array is presented. A 2-D THz reflective image is reconstructed with only four detectors using rotational synthesis.