6 results about "Noise temperature" patented technology

The present application relates to the technical field of testing, in particular to a noise figure test automatic calibration, compensation and correction method and system. The method comprises the following steps: obtaining the loss L of a microwave switch matrix; obtaining the equivalent noise temperature obtained by a test of a measured object and the test gain of the measured object; obtaining the real equivalent noise temperature of the measured object based on the loss L of the microwave switch matrix, the equivalent noise temperature obtained by the test of the measured object, the test gain of the measured object, a standard noise temperature; and converting the real equivalent noise temperature of the measured object into the real noise figure of the measured object. The present application can realize automatic calibration and compensation of noise figure test based on the Y-factor method, and support full-automatic testing of an automatic test system.

The application belongs to the field of radio detection, and particularly relates to a phased array incoherent scatter radar background noise calculation method and system, aiming to solve the problem of calculating background noise in phased array incoherent scatter radar detection. The application comprises: calculating the sky noise temperature of a corresponding detection point according to any detection beam selected by the radar grating-free detection area; obtaining the spatial angle between the position of the sun and the position of the detection point, and combining the radar system parameters to determine the sun noise temperature of the detection point; determining the atmospheric noise temperature of the detection point according to the elevation angle of any detection beam and the detection environment temperature; and comprehensively calculating the sky noise temperature, the sun noise temperature, the atmospheric noise temperature and the system noise temperature of the radar itself to obtain the background noise temperature of the detection point. The application can accurately calculate the background noise temperature of the phased array incoherent scatter radar, and effectively obtain the background noise state of the radar detection.

The application discloses a kind of methods for measuring antenna noise temperature, belong to antenna measurement technical field.The application includes: in antenna field installation antenna to be measured, utilize antenna servo controller to drive antenna points to clear sky, there is no shelter in front of antenna;The state parameter of spectrum analyzer is set, and the noise power density of system output is measured using the noise measurement function of spectrum analyzer;Directly calculate antenna noise temperature from the noise power density of system output measured.The measurement method of the application is simple and easy to operate, and has high popularization and application value.

An aspect of the disclosure provides an apparatus comprising: an electromagnetic resonator configured to support an oscillating electromagnetic field in a sample; a cold load having a noise temperature lower than the noise temperature of the electromagnetic resonator; a coupler controllable to provide: a first coupling between the electromagnetic resonator and the cold load to reduce the noise temperature of the electromagnetic resonator; a second coupling, different from the first coupling, to the electromagnetic resonator for sensing an electromagnetic field associated with the sample.

A waveguide receiver apparatus includes a power splitter circuit with an attenuation card; a mixer circuit coupled to an output of the power splitter circuit; and an antenna assembly coupled to an output of the mixer circuit. The aspects of the disclosed embodiments provide a highly compact and sensitive 500-600 GHz, 1×8 receiver array, with a conversion loss of less than approximately 11 decibels (dB), a noise temperature of less than 2000 degrees Kelvin (K) at 540 GHz, and a wide intermediate frequency (IF) bandwidth of approximately 70 Gigahertz (GHz).