Abstract
The spatial high-resolution synthetic aperture radar (SAR) for ocean exploration puts forward higher requirement for output power and amplitude-phase consistency of the pulsed TWT amplifier. The kW class pulsed TWT amplifier based on broadband power combining is the key technology for space SAR applications. In this paper, the factors affecting the amplitude and phase consistency of MPM are studied, and a phase consistency compensation circuit was designed to improve the phase consistency of multiple sets of products. A microwave power model (MPM) with dual TWTs output integrated architecture was proposed which consists of two short travelling wave tubes (TWT), two solid-state power amplifiers (SSPA), and an electronic power conditioner (EPC). More than 45% efficiency is achieved in 15% duty cycle within 600 MHz bandwidth, and the phase consistency was less than ± 5 degrees.With the improvement of synthesis efficiency, higher synthesis power and higher sensitivity of ocean wide scanning and detection can be obtained
Highlights
Technology evolution promotes the rapid development of space remote sensing science, in the field of atmosphere and ocean exploration, C-band 100W and Ku band 120W pulsed travelling wave tubes (TWT) amplifiers are usually applied in synthetic aperture radar (SAR) satellite system
In order to meet the demand of high power pulsed output for SAR satellite of ocean exploration, this paper proposed a dual TWTs pulsed microwave power model (MPM), and designed a continuously adjustable phase compensation circuit for power synthesis to achieve high amplitude and phase consistency of multi-channel TWT amplifiers
A Ku-band 500W dual TWT pulsed MPM with high amplitude and phase consistency was proposed for aerospace SAR system, which has been in flight over two years
Summary
Technology evolution promotes the rapid development of space remote sensing science, in the field of atmosphere and ocean exploration, C-band 100W and Ku band 120W pulsed TWT amplifiers are usually applied in SAR satellite system. In order to meet the demand of high power pulsed output for SAR satellite of ocean exploration, this paper proposed a dual TWTs pulsed MPM, and designed a continuously adjustable phase compensation circuit for power synthesis to achieve high amplitude and phase consistency of multi-channel TWT amplifiers. This MPM has been in orbit for more than three years was assembled in Academy of Space Electronic Information Technology (CAST) in 2017.
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