5) To have twin-aperture and you will multi-polarization methods, a to have switching matrix is used to switch the new obtained echo signals of various apertures of antenna to make a few searching avenues.

Multi-Polarization Phased Number SAR Antenna

GF-3 SAR satellite antenna having multiple-polarization and multi-imaging modes is using both-dimensional checking energetic phased variety antenna system, normally see spotlight, stripmap, check always or other imaging modes. The fresh new antenna performs in C-band, has multi-polarization while offering multiple-process settings, following a widened plane two-dimensional scanning energetic phased number antenna program. In shown means, new transmit connect amplifies the efficacy of the fresh enter in chirp rule and you may radiates electromagnetic energy into the specified area. On the choosing mode, brand new antenna assortment get horizontal or straight polarization echo indicators, and you may on top of that receives dual polarized mirror indicators and, which can be sent to the fresh new SAR central electronic devices through a beneficial low-looks amplification hook up. So you’re able to read the new antenna show detection, blame identification and separation, the fresh antenna might be calibrated in control of the fresh central digital camera. Antenna with multi-polarization, high polarization isolation, therefore the big shaped beam means keeps a peak yields stamina regarding 15360 W, having fun with a mechanical little T/Roentgen component and you will narrow wall structure waveguide build technical.

The new variety thermal manage realizes the temperature handle mode for the SAR antenna assortment surface, appointment the requirement of usage of each solitary digital solitary gadgets, and promises the service life of brand new electric gadgets.

The latest antenna is enhanced on such basis as a classic SAR satellite antenna build, and has now fundamental provides as follows:

• Highest polarization separation. Through the separation of your own antenna product, the fresh new T/R module route plus the electromagnetic shielding of cable, brand new antenna can be in addition located twin polarization (H/V) indicators with a high polarization isolation (>thirty-five dB).

• High energy application overall performance and you may thermal manage reliability. From the making sure the better fuel performance, improving the rays performance away from microwave equipment, and as a result of the thermal power over the antenna variety concurrently, the brand new antenna performs within a reasonable temperatures range to guarantee the stability of your own ray leading.

• Large precision control over the 2 dimensional beam. The fresh amplitude and phase stability of transceiver route, the speed of the beam switching impulse, additionally the reliability of one’s dual-polarization ray control are designed to qualify of your own twelve modes and achieve versatile beam studying and you can shaping.

• Lowest size. New antenna was reduced bulk framework mostly thanks to two approaches: one is the overall realistic scheme into the antenna solutions, decreasing the level of technology and you can interconnect difficulty; others is always to enhance the framework and you can tech level, raising the intensity of included framework.

Inner Calibration out-of SAR Program

To find the high-reliability and you will quantitative application requirements to own imaging study, an in-board calibration means are totally noticed. Plenty of calibration loops was designed to defense the complete choosing and sending link and have the convenience of polarization calibration.

The brand new SAR program gets the convenience of unmarried polarization and you can multiple polarization calibration. Through calibration, genuine linear FM rule, program get calibration, antenna development and you will get exists.

New variety calibration would be split up into full selection calibration and you may single T/R module calibration. To possess full range calibration, the T/R modules work at the same time to help you measure complete range transmitted energy and complete range found obtain scaling; unmarried part calibration is to screen the newest RF characteristics of every T/R component. Anta hot girl At exactly the same time, this new thermal appears of your whole program shall be recorded whenever the complete variety T/Roentgen module is in its highest impedance county.