49 results about "Antenna temperature" patented technology

The invention discloses a real-time monitoring microwave dicke radiometer based on a reference load temperature and belongs to the field of microwave passive remote sensing. The radiometer comprises a dicke input switch, wherein a first end of the dicke input switch is sequentially connected with a radio frequency and intermediate frequency amplifying circuit, a square law detector, a low frequency amplifier, a synchronous detector, a low pass filter and a data collecting and processing module, a second end of the dicke input switch is switched between a reference load and an antenna under the driving of a switch signal generator, and a temperature measuring circuit is arranged on the reference load and connected with the data collecting and processing module. The reference load of the microwave dicke radiometer is not required to be kept in a constant temperature state, only the temperature measuring circuit is used for monitoring the temperature changes of the reference load in real time, the monitored variable quantity of the temperature of the reference load is plugged into a radiometer scaling equation for modification, and an antenna temperature of the measured scene is obtained. According to the real-time monitoring microwave dicke radiometer based on the reference load temperature, the measuring accuracy is improved and the structure of the existing microwave dicke radiometers is simplified.

The invention discloses a gain-and-direction-orientated structure thermal deformation compensation method for a satellite-borne active phase control array antenna. The method comprises the steps of determining structural parameters, material attributes and electromagnetic parameters of the antenna; determining antenna environment thermal load; calculating antenna temperature field distribution under sunshine; determining T / R assembly thermal power consumption; calculating antenna temperature field distribution under the T / R assembly thermal power consumption; performing temperature field superposition and calculating the thermal deformation of the antenna structure; extracting position offset in the array element geometric center; calculating the additional error of the array element space phase; determining the amplitude and phase distribution of array element excitation current; calculating the electrical performance of the antenna; judging whether gain and direction are both satisfied simultaneously or not; and calculating the antenna ideal main beam directed unit vector, the adjusting amount of the array element space phase, and the phase current of the compensated array element excitation current. The compensation method provided by the invention is combined with a phase adjusting method, so that the electrical performance compensation to the deformed satellite-borne active phase control array antenna is realized; the problem of antenna electrical performance degradation caused by structural thermal deformation is solved; and the normal operation of the antenna can be ensured.

Temperature measurement systems (20) include a temperature sensor (22) and an electronic signal interrogator (24). The temperature sensor (22) has a transponder (26) equipped with an antenna (28), and a separate parasitic antenna (32) with a temperature-sensitive transducer (34, 68-74, 78a-84a), while the interrogator (24) has a transmitter (42) and antenna (40). The sensor (22) is designed to be placed in thermal contact with an object to be temperature-measured, with the interrogator (24) placed in proximity to the object. The systems (20) may be used with food servingware domes (88, 114), which can be preheated and placed over a food-bearing plate to maintain the temperature of the food.