Description: 基于RSSI的定位，已知发射节点的发射信号强度, 接收节点根据接收信号的强度, 计算出传播损耗, 利用理论的或经验的信号传播模型将传播损耗转化为距离, 然后再计算出节点的位置。-RSSI-based positioning, known to the launch of the launch signal strength node, receiving node based on received signal strength to calculate the spread of wear and tear, or experience the use of the theory of signal propagation loss model will be spread into the distance, and then calculate the location of the node . Platform: |
Size: 7168 |
Author:闫军 |
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Description: 基于RSSI的定位，已知发射节点的发射信号强度, 接收节点根据接收信号的强度, 计算出传播损耗, 利用理论的或经验的信号传播模型将传播损耗转化为距离, 然后再计算出节点的位置-RSSI-based positioning, known to launch the node transmission signal strength, the receiving node according to received signal strength, transmission loss calculated using the theory or experience loss of signal propagation model will spread into the distance and then calculate the location of the node Platform: |
Size: 3072 |
Author:王磊 |
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Description: For free space path loss, fc=1.5GHz (Carrier frequency)
If we take different antenna gains such as 1.(Gt=1,Gr=1)and 2.(Gt=1,Gr=0.5)and 3.(Gt=0.5,Gr=0.5)
When we reduce the antenna gains (i.e. the transmitting gain or the receiving gain) there is an increase in the path loss of propagation of radio waves in wireless channel. The average signal strength level at the receiver gets decreased, along the distance from the transmitter to the receiver
Platform: |
Size: 1024 |
Author:aj |
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Description: 衰落是由于发射机与接收机之间空间位置的微小变化引起的，描述小范围内接收信号场强中瞬时值的快速变化特性，是由多径传播和多普勒频移两者共同作用的结果，包括由多径效应引起的衰落和信道时变性引起的衰落，具有信号的多径时延扩展特性和信道的时变特性-Fading is caused due to a slight change of the position of the space between the transmitter and the receiver, the characteristics of the receiving signal field strength, the instantaneous value of the rapid changes in the description within, by multipath propagation and Doppler frequency shift of the joint action of botha result, time-varying fading caused by multipath effects and channel fading due to multipath delay spread characteristics and channel time-varying characteristics of the signal Platform: |
Size: 70656 |
Author:maimuyu |
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Description: 高功率瞬态电场的测试是电磁环境效应评估与防护研究领域的难点。笔者基于有源电光调制法，设
计了一种高功率瞬态电场传感器。通过建立简化的等效电路模型，并借助CST 微波工作室对该传感器的结
构建模仿真，分别从频域和时域分析了接收天线负载对传感器接收特性的影响，并得到了一致的结果。结果
表明：接收天线采用单极子天线，负载采用低阻时响应信号为被测电场的微分信号，采用高阻时响应电压与
被测电场场强成正比，通过改变负载电容取值可以控制传感器量程。-High power transient electric field testing is electromagnetic environment effects assessment and protection of areas of difficulty. The author based on active electro-optic modulation method, the design of a high power transient electric field sensors. Through the establishment of a simplified equivalent circuit model, and with the CST MICROWAVE STUDIO sensor structure modeling and simulation, respectively, from the frequency domain and time domain analysis of the receiving antenna receives the load characteristics of the sensor, and get consistent results. The results showed that: the receiving antenna using monopole antennas, low-impedance load using the response signal is a differential signal measured electric field, using high impedance response voltage proportional to the measured electric field strength, by changing the value of the load capacitance sensor can be controlled range. Platform: |
Size: 305152 |
Author:张毛毛 |
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Description:
本系统为立体声调频收音机，设计采用RDA5807收音模块，与单片机相结合，使收音解调电路设计变的简单，实现FM收音并显示频率。我们通过矩阵键盘设定我们需要的频段，并设置音量大小，通过诺基亚5110液晶屏显示出来，并根据所显示接收信号的强度等级，判断收音所在地的信号强度。RDA5807模块具有65-108MHz全球FM接收频段相容的效果，具备噪声消除、软静音、低音增强、灵敏度高、噪声小、抗干扰能力强等功能，所以使用本模块很容易实现，且系统可靠稳定。-This system is designed using RDA5807 stereo FM radio, radio module, combined with MCU, the radio receiver demodulation circuit design becomes simple, realize the FM reception and display frequency. We set the frequency we need through the matrix keyboard, and set the volume size displayed by the NOKIA 5110 LCD screen, and according to the received signal strength display, signal strength to determine the location of the radio. RDA5807 module with 65-108MHz global FM receiving band compatible with the effect, noise elimination, soft mute, bass enhancement, high sensitivity, low noise, strong anti-interference ability and other functions, so the use of this module is very easy to implement, and the system is reliable and stable. Platform: |
Size: 3138560 |
Author:chen |
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Search - receiving Signal strength