火控雷达技术
火控雷達技術
화공뢰체기술
FIRE CONTROL RADAR TECHNOLOGY
2011年
4期
46-50
,共5页
宽带波束形成%去斜%二次下变频
寬帶波束形成%去斜%二次下變頻
관대파속형성%거사%이차하변빈
wideband beam forming%deramping%twice down-converting
宽带相控阵宽角扫描波束形成中,常用模拟延时线技术解决复包络偏移问题,但硬件的高代价阻碍其实际应用。本文在基于跟踪状态及发射线性调频信号的假设下,提出一种二次下变频方法实现宽带数字波束形成,本方法首先对阵元级接收数据进行模拟混频实现去斜,数字域再进行二次下变频,相位补偿后实现波束形成,最终通过傅氏变换获得散射点信息。
寬帶相控陣寬角掃描波束形成中,常用模擬延時線技術解決複包絡偏移問題,但硬件的高代價阻礙其實際應用。本文在基于跟蹤狀態及髮射線性調頻信號的假設下,提齣一種二次下變頻方法實現寬帶數字波束形成,本方法首先對陣元級接收數據進行模擬混頻實現去斜,數字域再進行二次下變頻,相位補償後實現波束形成,最終通過傅氏變換穫得散射點信息。
관대상공진관각소묘파속형성중,상용모의연시선기술해결복포락편이문제,단경건적고대개조애기실제응용。본문재기우근종상태급발사선성조빈신호적가설하,제출일충이차하변빈방법실현관대수자파속형성,본방법수선대진원급접수수거진행모의혼빈실현거사,수자역재진행이차하변빈,상위보상후실현파속형성,최종통과부씨변환획득산사점신식。
In wide scanning angle beam forming of wideband phased array radar, analog delay line technology is commonly used to solve complex envelope shift problem, however, the high cost of hardware blocks its practical application. A twice down-converting method is presented to implement wideband digital beam forming under assumption based on tracking state and transmitting linear FM signal. This method is firstly to perform analog mixing for receiving data at array-element level to implement deramping, and twice frequency down-conversion further in digital domain, then implement beam forming after compensation in phase, and finally information at scattering point is ob- tained by Fourier transformation.