Power synthesis terahertz amplitude-stabilizing method based on phase adjustment
A phase adjustment, terahertz technology, applied in the field of terahertz sources, can solve the problems of difficulty in stabilizing terahertz signals, the monotonicity of the control function is not strong, and it cannot meet the fast amplitude adjustment, etc. Effect
Active Publication Date: 2016-12-07
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
At this stage, it is very difficult to obtain a terahertz signal with stable amplitude. One is that the terahertz signal is generated by a nonlinear process regardless of the optical or electrical means. Controlling its bias parameters cannot ensure that the signal is generated in a better stable state. And the monotonicity of the control function is not strong; the second is to use the attenuator for dynamic adjustment, but most of the terahertz attenuators are manually adjusted at this stage, and the response speed of a small number of electronically adjustable attenuators that have been reported are all on the sub-second level. Unable to meet the needs of rapid amplitude adjustment
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[0020] The present invention can be divided into two parts from the technical level: the phase adjustment of the stable amplitude power output and the adoption of the envelope detection feedback network. Among them, the former mainly expounds the dynamic stabilization process and theoretical basis of the signal output level through fast phase control; the latter expounds that the feedback of the signal is not a general feedback method, and the envelope feature extraction of the signal must be carried out to eliminate the phase noise band. to interfere.
[0021] (1) Theoretical analysis of phase adjustment for stable amplitude power output
[0022] The realization process of the power synthesis terahertz amplitude stabilization method based on phase adjustment is mainly the following two key processes: by adjusting the phase difference of the two signals to 90° (other non-zero phase difference states are also possible, but the 90° phase difference The situation is the best, an...
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The invention discloses a power synthesis terahertz amplitude-stabilizing method based on phase adjustment. The traditional intensity detector is used as amplitude detection, and a low-frequency envelope detection signal for detecting the level is used as feedback quantity to drive the phase fitness-degree adjustment between the branches of the power synthesis, thereby realizing the adjustment function of the final terahertz output amplitude. In the self-feedback and correction process, the output amplitude of the terahertz signal can be restrained by a feedback signal, so that the level amplitude of the output terahertz signal is changed to be steady to achieve the amplitude-stabilizing aim.
Description
technical field [0001] The invention belongs to the field of signal processing, and relates to a signal amplitude adjustment method, which is especially suitable for terahertz sources that require terahertz amplitude stabilization characteristics. Background technique [0002] Terahertz technology is a hotspot in current academic research, and can be applied to fields closely related to national economic and social development, such as object imaging, environmental monitoring, medical diagnosis, radio astronomy, security inspection, anti-terrorism detection, satellite communication, and radar detection. Terahertz source is one of the indispensable components. Although there are strict requirements on the output power of the terahertz source in practical applications, the actual value of the output power of the terahertz source is still not known accurately. Even if the power meter purchased from abroad, its measurement accuracy cannot be guaranteed after a long period of use...
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IPC IPC(8): H03L7/22
CPCH03L7/22
Inventor 朱忠博李小军谭庆贵蒋炜梁栋窦金芳曹政
Owner XIAN INSTITUE OF SPACE RADIO TECH