94 results about "Radio astronomy" patented technology

An energy-harvesting compute grid includes computing assemblies that cooperate with mobile energy harvesters configured to be deployed on a body of water. The plurality of energy harvesters are positioned on and move adjacent to an upper surface of a body of water, and the locations of the energy harvesters can be monitored and controlled. The wide-spread gathering by the harvesters of environmental data within that geospatial area permits the forecasting of environmental factors, the discovery of advantageous energy-harvesting opportunities, the observation and tracking of hazardous objects and conditions, the efficient distribution of data and / or tasks to and between the harvesters included in the compute grid, the efficient execution of logistical operations to support, upgrade, maintain, and repair the cluster, and the opportunity to execute data-gathering across an area much larger than that afforded by an individual harvester (e.g., radio astronomy, 3D tracking of and recording of the communication patterns of marine mammals, etc.). The computational tasks can be shared and distributed among a compute grid implemented in part by a collection of individual floating self-propelled energy harvesters thereby providing many benefits related to cost and efficiency that are unavailable to relatively isolated energy harvesters, and likewise unavailable to terrestrial compute grids of the prior art.

Methods for mitigating sidelobes and aliases, providing levels of suppression in excess of 20 dB. The methods may include 1) a version of the CLEAN algorithm developed in radio astronomy, modified to work on sub-aperture images; 2) weighting functions based on the phase and amplitude statistics of the sub-aperture image pixels to select points in the CLEAN algorithm; and 3) weighting functions based on the phase and amplitude statistics of the sub-aperture image pixels to mitigate sidelobes and aliases, in conjunction with CLEAN or separately. The methods may be used with all synthetic aperture techniques and are not limited to SAR.

The invention discloses a Si-based FET annular THz detector antenna based on a CMOS manufacturing process, and belongs to the field of antennas. The Si-based FET annular THz detector antenna comprises an annular antenna body, a Si-based FET and a low noise amplifier. The annular antenna body is used for receiving THz waves and meanwhile converting the received THz waves into electric signals to be transmitted to the FET, high-frequency signals are converted into low-frequency signals by the FET and are transmitted to the low noise amplifier, and finally the THz signals can be detected after the signals pass through the low noise amplifier. The Si-based FET annular THz detector antenna is importantly applied to security scanning, radio astronomy, biological remote sensing, production monitoring and other fields.

The invention discloses a broadband dual-linearly-polarized or dual-circularly-polarized feed source in the fields of wireless communication and radio astronomy. The broadband feed source consists of four groups of radiation oscillators, 2 impedance-matched printed boards and a circularly-polarized electric bridge, wherein the radiation oscillators are log periodic dipole arrays, and are connected with the two impedance-matched printed boards which are orthogonally arranged, so that impedance values of the wide ends of metal microstrip lines of the impedance-matched printed boards are 1 / 4 of impedance values between left and right pins of the radiation oscillators, so that feeding is simplified, and high performance is achieved. The broadband feed source is simple and compact in structure, low in feed loss and machining cost, high in feed efficiency and particularly applicable to a feed network of a feed source or antenna working under a broadband dual-linear-polarization or dual-circular-polarization application condition.

An interference classifier is disclosed for determining the type of interference present in a signal. The interference classifier 601 comprises a buffer 602 operable to receive and store data comprising samples of a signal; a scale factor calculator 603 operable to use the signal samples to calculate a scale factor in dependence upon the levels of the signal samples; a normaliser 604 operable to calculate normalised signal samples by using the scale factor to normalise the signal samples; a nonlinear transformer 605 operable to perform a nonlinear transform on the normalised signal samples to calculate transformed signal samples; an averaging circuit 606 operable to calculate an average of the transformed signal samples; and a comparator 607 operable to compare the calculated average of the transformed signal samples to a predetermined threshold level in order to determine the type of interference present in the received signal. The interference classifier 601 disclosed herein performs an advantageous type of nonlinear transform that provides an improvement in detection probability over known kurtosis-based interference classifiers. Applications of the interference classifier 601 include automotive radar systems, radio astronomy, microwave radiometry, weather forecasting and cognitive radio networks.

An energy-harvesting compute grid includes computing assemblies that cooperate with mobile energy harvesters configured to be deployed on a body of water. The plurality of energy harvesters are positioned on and move adjacent to an upper surface of a body of water, and the locations of the energy harvesters can be monitored and controlled. The wide-spread gathering by the harvesters of environmental data within that geospatial area permits the forecasting of environmental factors, the discovery of advantageous energy-harvesting opportunities, the observation and tracking of hazardous objects and conditions, the efficient distribution of data and / or tasks to and between the harvesters included in the compute grid, the efficient execution of logistical operations to support, upgrade, maintain, and repair the cluster, and the opportunity to execute data-gathering across an area much larger than that afforded by an individual harvester (e.g., radio astronomy, 3D tracking of and recording of the communication patterns of marine mammals, etc.). The computational tasks can be shared and distributed among a compute grid implemented in part by a collection of individual floating self-propelled energy harvesters thereby providing many benefits related to cost and efficiency that are unavailable to relatively isolated energy harvesters, and likewise unavailable to terrestrial compute grids of the prior art.

The invention provides an interference testing system between millimeter wave radar and radio astronomy. The interference testing system comprises an electromagnetic shielding chamber, a horn antenna,a radar simulator and a high-precision frequency spectrograph, wherein the horn antenna is matched with the frequency band of the tested millimeter wave radar, is arranged in the electromagnetic shielding chamber and is opposite to the millimeter wave radar; the distance between the horn antenna and the tested millimeter wave radar is smaller than a preset value; the radar simulator is arranged in the electromagnetic shielding chamber; the signal input end of the radar simulator is connected with the horn antenna and is used for simulating an electromagnetic environment in a current testing environment and current testing distance; the high-precision frequency spectrograph is arranged in the electromagnetic shielding chamber; the signal input end of the high-precision frequency spectrograph is connected with the signal output end of the radar simulator; the high-precision frequency spectrograph is used for simulating the radio astronomy and outputs signal intensity inputted from the signal input end of the high-precision frequency spectrograph to the high-precision frequency spectrograph. The interference testing system between the millimeter wave radar and the radio astronomy, provided by the invention, has the advantages that complexity and high possibility of making errors for obtaining the result are reduced, and a large amount of consumption of labor force and physical force in an actual external field test is avoided.

The present invention provides a navigation method for the Mars capture section combining astronomical speed measurement and ground radio, comprising the following steps: the ground station obtains the distance between the detector and the ground through radio ranging; the ground station obtains the detection distance through radio Doppler speed measurement. The radial velocity between the detector and the ground station; the detector obtains the radial velocity between the detector and a certain star through the autonomous speed measurement and navigation sensor; through the extended Kalman filter, the position and velocity estimation of the space-ground integrated navigation are obtained. Compared with the navigation only relying on the ground radio, the method of the invention adds the independent astronomical speed measurement observation of the detector, which can effectively improve the navigation accuracy.