The propagation at low altitudes and the ADC noise in the RF direct sampling system taken are considered, and the main factors which affect the coverage of low altitude detection is analyzed.
考虑低空传播以及直接采样系统中adc器件的噪声，分析了低空探测时影响观测范围的主要因素。
The RF direct sampling scheme is used in HLS digital TBF system, and simplifies the electronics circuits and saves the cost for tuning and maintaining.
数字系统应用RF直接采样前端，简化了前端电子学线路，节约了系统成本并方便了调试和维护工作。
As a key technology in digital quadrature demodulation system, the direct IF sampling filter with sharp cutting-off transition band can improve the performance of demodulation system.
中频采样是数字正交鉴相系统中的一项关键技术，具有锐截止特性的中频采样滤波器可以改善鉴相系统的性能。
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