The present invention relates to a method and an apparatus for continuously detecting a hazardous and noxious substance from multiple satellites, and specifically, provides a method and an apparatus for continuously detecting a hazardous and noxious substance from multiple satellites, the method and apparatus: receiving a multi-satellite image which is photographed by a multi-satellite comprising a satellite having an imaging radar (SAR), a satellite having an infrared sensor, and a satellite having an electronic optical sensor; acquiring a reference image, of the satellite having the SAR, including a ground control point of an observed region; extracting a corresponding point between the reference image and the multi-satellite image; implementing the image matching and geometric correction for the multi-satellite image by using the extracted corresponding point; confirming at least one among the brightness value of pixels of the SAR satellite image, the temperature value of pixels of the infrared satellite image or the color value of pixels of the optical satellite image which are included in the corrected multi-satellite image so as to detect the hazardous and noxious substance, and determine the flow information, thereby detecting continuously and stably the hazardous and noxious substance.

Please replace the Abstract originally filed with the following: A method and device for suppressing range ambiguity and a computer readable storage medium are provided. The method includes: determining a pulse timing relationship of a transmission signal; determining orthogonal nonlinear frequency modulation signals; modulating the transmission signal by using the orthogonal nonlinear frequency modulation signals; transmitting the modulated transmission signal according to the pulse timing relationship, and determining echo data of the modulated transmission signal; and generating an image according to a polarization scattering matrix for the echo data of the modulated transmission signal.

A synthetic aperture radar (SAR) generates concurrent first radar pulses in first frequency channels. The SAR transmits, and receives returns of, the concurrent first radar pulses by first antenna feeds that form first beams in the first frequency channels and that are directed to respective first subswaths of a swath on the Earth separated by subswath gaps. The SAR generates concurrent second radar pulses in second frequency channels. The SAR transmits, and receives returns of, the concurrent second radar pulses by second antenna feeds configured to form second beams in the second frequency channels and that are directed to respective second subswaths of the swath on the Earth and that coincide with the subswath gaps. The SAR processes the returns of the first radar pulses from the first subswaths and the returns of the second radar pulses from the second subswaths to form a SAR image contiguous across the swath.

A method is presented for the formation of a constellation of small satellites (smallsats) for radar surveillance employing multiple input, multiple output (MIMO) radar operation. Such a constellation can be used for cost-effective fine angular resolution and persistent remote sensing of targets or regions on, above, and below a planet's surface. Applications include, but are not limited to, surface mapping (including change detection), mapping of meteorological conditions, and detection of fleeting events. The method pertains to satellite configurations whose costs and aggregate masses are much less than those of conventional space-based radar measurements attempting to attain comparable angular resolution, while providing persistent surveillance.

A high-resolution fully polarimetric frequency modulation continuous wave (FMCW) image radar system using an RF switch and an image processing method are provided. The image radar system includes a signal generator that generates a frequency modulation signal, a transmitter that radiates the frequency modulation signal as vertical polarization and horizontal polarization using a vertically polarized transmit antenna and a horizontally polarized transmit antenna, a receiver that receives a signal in which a vertically polarized signal and a horizontally polarized signal are reflected from an object, using a vertically polarized receive antenna and a horizontally polarized receive antenna, and generates a VV/HV polarization data set and a VH/HH polarization data set based on the signal received via the vertically polarized receive antenna and the horizontally polarized receive antenna, and a signal processor that obtains a fully polarimetric radar image based on bilateral symmetry correction and azimuth compression.

A Van Atta antenna array comprising a number of antenna elements electrically connected to operate as a Van Atta antenna array and fabricated on and within a substrate. Each antenna element has a number of patch elements fabricated on the top surface of the substrate, with the patch elements being interconnected by substrate integrated waveguides. The antenna array provides a two-dimensional retro-reflective surface, which makes it especially suitable for InSAR monitoring of infrastructures.

A method includes transmitting, by a radiofrequency identification (RFID) reader device, a first electromagnetic radiation at a first polarization to a scan area and second electromagnetic radiation at a second polarization to the scan area. Re-radiated first electromagnetic radiation is received from an RFID tag located in the scan area at the first polarization. Re-radiated second electromagnetic radiation is received from the RFID tag at the second polarization. A radar image is generated based on the first and second re-radiated electromagnetic radiation. One or more items of information encoded in one or more microstructure elements located on the RFID tag are decoded based on the generated radar image. An RFID reader device and an RFID system are also disclosed.

Systems and methods in accordance with various embodiments of the present disclosure provide high efficiency synthetic aperture radar satellite designs that achieve higher power efficiency and higher antenna aperture size to satellite mass ratios than the current state of the art. In various embodiments, a high efficiency synthetic aperture radar satellite includes a satellite bus and a parabolic reflector antenna coupled to the satellite bus. The satellite system may further include a traveling wave tube amplifier configured to drive the parabolic reflector antenna, and a body-mounted steering system configured to mechanically steer the satellite system to direct the parabolic reflector antenna. The satellite system may further include a processor configured to combine the pulse reflections and generate image data representing the region of interest, in which the image data is effectively obtained with a synthetic aperture greater than the actual antenna aperture.

A millimeter wavelength charting synthetic aperture radar having small dimensions and light weight, carried by an UAV (unmanned aerial vehicle), also referred to as a drone.

The present invention relates to an advanced spaceborne Synthetic Aperture Radar (SAR) system and method that can provide high resolution measurements of the Earth or planetary surface, overcoming limitations in conventional SAR systems, and reduce development costs. The present invention utilizes advanced and innovative techniques, such as software defined waveforms, digital beamforming (DBF) and reconfigurable hardware, to provide radar capabilities not possible with conventional radar instruments, while reducing the radar development cost. The SAR system architecture employs a modular, low power, lightweight design approach to meet stringent spaceborne radar instrument requirements. Thus, the present invention can enable feasible Earth and planetary missions that address a vast number survey goals, including the measurement of ecosystem structure and extent, surface and sub-surface topography, subsurface stratigraphy, soil freeze-thaw, ice sheet composition and extent, glacier depth, and surface water, among many others.