论文部分内容阅读
1.并联运行的A/D技术 VHRR系统信息通带为15.7 kHz,取采样频率为40 kHz。若按五路编排多路时分传输采样,每通道转换一次仅5μs,则要求编码速率2MHz以上。设计三只A/D在同一采样周期25μs并在同一控制节拍下并联工作,由转换结束脉冲启动打出脉冲发生器,其各自数据经锁存后在下一采样周期内分五次依次把各路数据并行高速打入RAM,与此同时继续第二次A/D转换。这样就把编码速率降为500 kHz。 2.应用RAM作速率变换和实时发送
1. Parallel operation of A / D technology VHRR system information passband 15.7 kHz, take the sampling frequency of 40 kHz. If you press the five-way multi-channel time-sharing transmission sampling, conversion of only 5μs per channel, the required encoding rate of 2MHz or more. Design three A / D in the same sampling cycle 25μs and work in parallel under the same control beats by the end of the conversion pulse start pulse generator, the respective data after the latch in the next sample cycle in five times in order to the various data Parallel high-speed access to RAM, while continuing the second A / D conversion. This reduces the encoding rate to 500 kHz. 2. Application of RAM for rate conversion and real-time send