rf bandwidth 和 带宽 测距 范围 的关系

本文探讨了宽带操作如何增加通信系统的范围,同时也带来了功率消耗的增加。通过分析不同带宽对系统性能的影响,提供了优化功率使用和提高效率的策略。

has a bearing on

Operating at a wider bandwidth increases range but also increases power consumption

2) Minimize Ranging Interval: We optimize the hopping process by introducing an antenna switching scheme, in which the anchor selects TX antenna between the hopping process, as shown in Fig. 3(c). Specifically, the anchor actively controls the RF switch to select the connected antenna before the transmis sion.WhenarangingpacketontheCH1 subchannelisprocessed from the first antenna (antenna 1 in Fig. 3(c)), we switch to another antenna (antenna 2 in Fig. 3(c)) to transmit a ranging packet on the same subchannel, CH1, immediately. Then, we switch back to the first antenna for ranging packet transmission on the next subchannel, i.e., CH2. With the antenna switching scheme, the waiting time between two ranging operations on a subchannel decreases from 40 ranging operations time to 1 ranging operation time. NotethatanRFswitchtakesextra150nstoselecttheantenna. We reschedule the ranging process to reduce the interval for each ranging task. In every subchannel, the controller needs to concatenate the ranging parameters, including packet type, fre quency, and bandwidth, withtheoriginal frame before transmis sion, increasing processing time. These parameters are usually f ixed for tracking a specific target. Hence, we can prepare all the ranging packets in advance when the end device is idle. In par ticular, the synchronization packet selects the pseudo-random frequency hopping channels between the anchor and the target during the ranging. To this end, we move the synchronization packet generation process that was in-between the hopping processahead.Further,therangingpacketsarepreparedafterthe system booting, reducing 13 and 17 commands in the ranging and hopping process, respectively. From our measurements, the proposed reschedule saves 0.218ms请帮我解读分析下
最新发布
08-19
以GPS秒脉冲为复位信号及开始计时的时间基准,同时作为无线发射的触发信号。 计时由CPLD计数时钟脉冲实现,当发射机发射完毕后CC1100模块给出中断,中止主机CPLD的计时,得到发射时间脉冲数n1; 当接收机CC1100接收到数据包后,给出中断,提醒单片机处理,并且中止接收部分CPLD的计时,得到收到时间脉冲数n2。 由n2-n1乘以时钟周期可得电波的传播时间。 现在cpld用24MHz晶振,每个计数脉冲40Ns,对应距离为12.5m。 要进一步减小误差,可以通过提高cpld晶振频率或用更加精确的计时方法实现。 具体过程自己看程序,试验数据略 压缩包内容: 基于CC1101CPLD的时差法测距实验.doc 实验的简单说明。 CPLD程序:相关VHDL源程序, 实验中实际用的是“CPLD程序/Timer FOR CC1101/timer32+div.vhd” PCB: CC1100配合NewMsg-RF1100模块的电路板(A,B号板); CC1100+PA 1配合NewMsg-RFC1100A的电路板(加放大,距离较远)(C号板); Connector 在CC1100模块的电路板上应用NewMsg-RFC1100A的转接头。 实验中用的是NewMsg-RF1100模块既A,B号板。 单片机程序:配合实验的单片机程序,(A,B号板C号板程序通用,用NewMsg-RFC1100A模块时只需加转接座) 实际用的“C板 8 距离测试”程序 实验照片:实验时的事物照片,手机拍摄,效果一般。 无线模块资料:实验用到无线模块的资料。GPS模块CPLD资料略。 2009年7月22日 沨
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