摘要:
本文介紹一種用在X波段、調(diào)頻脈沖周期為1ms、脈寬為6s、幅度為7V,帶寬寬于30MHz的微波固態(tài)源鎖相環(huán)(簡稱線性調(diào)頻微波鎖相環(huán))。鎖相環(huán)用來穩(wěn)定微波固態(tài)源振蕩器產(chǎn)生的線性調(diào)頻信號起始點的頻率,使該點頻率具有和5MHz晶振相同的高穩(wěn)定度,這種環(huán)路與一般鎖相環(huán)的工作狀態(tài)不同,它是處在頻繁的開關工作狀態(tài),這種環(huán)路具有最短的時延、最快的捕捉能力、較大的同步范圍和良好的環(huán)路信噪比,在電路結(jié)構(gòu)上,也作了特別考慮,該環(huán)路首次用在遙感系統(tǒng)中并取得了較好的結(jié)果,通過實際運用證明,該環(huán)路簡單、可靠、輸出功率大、性能優(yōu)良。本文將著重介紹這種環(huán)路的工作特點和實現(xiàn)該環(huán)路所采取的一些特殊方法。
Abstract:
A description of a phase-locked loop (PLL) is given, which is successfully used in an X-band linear PM inicrowave source with 6 s pules width, 30 MHz bandwidth and 1 ms FM pulse cycle. A phase-locked method is used to obtain the linear FM pulse signal with highly stable starting frequency equal to the stability of the 5 MHz crystal oscillator. The operation of the PLL is under a switching mode. Minimum time delay, rapid ability of acquisition, large synchronous range, good signal to noise ratio, simplicity in consturuction and high reliability with higher power output are the advantages of the PLL used. the characteristic and the approach for the realization of the PLL are described also. This PLL has been used in a remote sensing system and high quality results have been obtained.
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