5) To have dual-aperture and you may multiple-polarization settings, a to get changing matrix is utilized to switch the newest received reflect indicators of different apertures of your own antenna to form several receiving channels.
Multi-Polarization Phased Number SAR Antenna
GF-step three SAR satellite antenna that have multiple-polarization and multiple-imaging settings is using both-dimensional studying productive phased number antenna system, can be read limelight, stripmap, inspect and other imaging methods. The fresh antenna really works in C-band, possess multiple-polarization and offers multi-process methods, following an expanded airplanes a couple of-dimensional browsing active phased assortment antenna system. For the aired mode, the new aired hook up amplifies the efficacy of the input chirp signal and you may radiates electromagnetic energy on the specified area. From the choosing setting, the antenna selection obtains horizontal otherwise straight polarization echo signals, and you may simultaneously get twin polarized reflect signals as well as, which happen to be sent to brand new SAR main digital gadgets via an effective low-noises amplification hook. In order to discover the fresh new antenna abilities detection, fault recognition and you can separation, the newest antenna shall be calibrated according to the command over the newest central digital camera. Antenna with multiple-polarization, highest polarization isolation, therefore the huge shaped korean dating sites beam setting provides a highest production energy away from 15360 W, using a mechanical smaller T/Roentgen component and narrow wall structure waveguide build tech.
The brand new selection thermal control realizes the warmth handle mode into SAR antenna number facial skin, conference the requirement of the means to access for each unmarried electric single gadgets, and you will claims the service life of the fresh digital devices.
The brand new antenna is optimized on the basis of a vintage SAR satellite antenna construction, and it has head has actually below:
• Highest polarization separation. From separation of your antenna unit, brand new T/R component station and the electromagnetic shielding of your own cable, the newest antenna is also concurrently discover dual polarization (H/V) signals having a high polarization separation (>thirty five dB).
• High-energy application overall performance and you may thermal control accuracy. Of the ensuring the higher electricity results, raising the rays overall performance away from microwave oven gadgets, and you may due to the thermal command over the fresh antenna assortment while doing so, this new antenna really works in this a fair heat assortment so that the balances of beam pointing.
• High accuracy control of both dimensional ray. The amplitude and stage balance of one’s transceiver station, the speed of your ray modifying effect, in addition to accuracy of your own dual-polarization ray control are created to be considered of your own 12 modes and achieve versatile beam scanning and you may framing.
• Low mass. New antenna are low bulk structure mostly thanks to a couple steps: you’re the overall realistic design inside the antenna options, decreasing the amount of gear and interconnect difficulty; one other is always to improve construction and you may technology peak, increasing the concentration of included build.
Inner Calibration regarding SAR Program
To know the new high-accuracy and you may quantitative application requirements to have imaging research, an on-board calibration mode is totally noticed. Enough calibration loops had been built to shelter the complete choosing and providing hook up and have the capacity for polarization calibration.
The SAR system contains the convenience of unmarried polarization and you will multiple polarization calibration. Because of calibration, genuine linear FM rule, program acquire calibration, antenna pattern and you will obtain can be obtained.
New selection calibration are divided into full array calibration and you can unmarried T/Roentgen component calibration. To own full range calibration, this new T/R modules functions in addition in order to size full number transmit stamina and you may complete variety located obtain scaling; solitary part calibration is to monitor the latest RF features of each and every T/Roentgen module. In addition, the fresh thermal noise of one’s entire program would be recorded when the complete selection T/R module is within the highest impedance county.
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