| 一种星载应答机接收信号快速同步技术 |
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| 作者单位： | 北京航空航天大学电子信息工程学院 北京100083 |
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| 摘 要： | 讨论一种星用调相模式应答机信号的快速捕获和跟踪方法。该方法通过4096点FFT运算能够快速地对载波的多普勒频偏进行估计,实现高动态下载波的粗同步,并通过二阶锁频环和辅助二阶锁相环实现载波的精密跟踪。测试表明,该应答机在载波捕获门限为-118dBm、多普勒变化范围为-115~ 115kHz、多普勒变化率为32kHz/s的高动态、低信噪比情况下,能在1s内快速完成接收信号的捕获和跟踪。
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| 关 键 词： | 应答机 调相 FFT 快速同步 |
A Fast Synchronization Technology for the Received Signal of the Satellite Transponder |
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| Authors: | Xu Feng Shao Dingrong Li Shujian |
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| Abstract: | A fast acquisition and tracking method for the satellite transponder in Phase Modulation mode is discussed.This method can estimate the Doppler frequency shift quickly by 4096 points FFT and acquire the carrier frequency approximately.Then the precise carrier frequency is gained by two orders PLL aided by two orders FLL.The practical test indicates that this transponder can acquire and track the received signal in one second on the conditions that the carrier acquisition threshold is-118dBm,the Doppler frequency varies at the speed of 32kHz per second and the Doppler frequency shift varies from-115kHz to 115kHz. |
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| Keywords: | Transponder PM FFT Fast synchronization |
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