Radio

摘要： Radio is know-how that comes with low manufacturing costs, and low infrastructure costs and its marginal cost of distribution is very low which is close to zero. This study was conducted to examine the rate at which radios advertise medical services and products;the factors that promote the patronage of radio-medicine and evaluate the effects of radio-medicine on people who patronize it. The study took place at Agogo by interviewing 50 people belonging to 10 different professional groups as follows: Farmers, Drivers, shopkeepers, tailors/seamstresses, teachers, hairdressers, barbers, market women, students and the unemployed. Through SPSS, the data was analyzed and the result indicated that 44.0% listen to radio once a day, 14.0% listen every hour, and 42.0% listen all day. On the reasons for patronizing radio-medicine, 24% bought per testimonies shared from others, 12% said it is easy to patronize, 12.0% do that for affordability and effectiveness, 8.0% said it is good, 4.0% were highly convinced by suppliers, 4.0% patronized because there are no side effects, 12.0% were for just trials, 10.0% said there is no time to go to the hospital, 8.0% did so because they had minor conditions and 6.0% patronized for first aid and relieve of symptoms. In addition, 68.0% agreed that the medicine worked for them as expected but 32.0% agreed that the medicine did not work as expected. It was concluded that most people listen to radio all day and most of them participate, in medicines advertised on the radio, because of testimonies shared by others. Even-though majority of the respondents thought they could be affected they did not care about it. Recommendations have been made to the Ministry of Health to regulate radio-medicine and its patronage and also for further research by research institutions.

摘要： High sensitivity radio searches of unassociated γ-ray sources have proven to be an effective way of finding new pulsars. Using the Five-hundred-meter Aperture Spherical radio Telescope(FAST) during its commissioning phase, we have carried out a number of targeted deep searches of Fermi Large Area Telescope(LAT) γ-ray sources. On February 27, 2018 we discovered an isolated millisecond pulsar(MSP), PSR J0318+0253, coincident with the unassociated γ-ray source 3 FGL J0318.1+0252. PSR J0318+0253 has a spin period of 5.19 ms, a dispersion measure(DM) of 26 pc cm-3 corresponding to a DM distance of about 1.3 kpc, and a period-averaged flux density of(~11±2) μJy at L-band(1.05-1.45 GHz). Among all high energy MSPs, PSR J0318+0253 is the faintest ever detected in radio bands, by a factor of at least ~4 in terms of L-band fluxes. With the aid of the radio ephemeris, an analysis of 9.6 years of Fermi-LAT data revealed that PSR J0318+0253 also displays strong γ-ray pulsations. Follow-up observations carried out by both Arecibo and FAST suggest a likely spectral turn-over around 350 MHz. This is the first result from the collaboration between FAST and the Fermi-LAT teams as well as the first confirmed new MSP discovery by FAST, raising hopes for the detection of many more MSPs. Such discoveries will make a significant contribution to our understanding of the neutron star zoo while potentially contributing to the future detection of gravitational waves, via pulsar timing array(PTA) experiments.

摘要： Rotating radio transients(RRATs) are peculiar astronomical objects whose emission mechanism remains under investigation.In this paper, we present observations of three RRATs, J1538+2345, J1854+0306 and J1913+1330, carried out with the Fivehundred-meter Aperture Spherical radio Telescope(FAST). Specifically, we analyze the mean pulse profiles and temporal flux density evolutions of the RRATs. Owing to the high sensitivity of FAST, the derived burst rates of the three RRATs are higher than those in previous reports. RRAT J1854+0306 exhibited a time-dynamic mean pulse profile, whereas RRAT J1913+1330 showed distinct radiation and nulling segments on its pulse intensity trains. The mean pulse profile variation with frequency is also studied for RRAT J1538+2345 and RRAT J1913+1330, and the profiles at different frequencies could be well fitted with a cone-core model and a conal-beam model, respectively.

摘要： PSR B0919+06 is known for its abnormal emission phenomenon, where the pulse emission window occasionally shifts progressively in longitude and returns afterwards. The physical mechanism behind this phenomenon is still under investigation. In this paper, we present our ultra-wideband observation of this pulsar using the Five-hundred-meter Aperture Spherical radio Telescope(FAST), with simultaneous measurements in the frequency ranges 280-780 and 1250-1550 MHz. We have identified three abnormal events, each of which becomes less apparent as the frequency decreases. At 1400 MHz, the averaged profile slightly shifted after the first and third abnormal events, implying a relationship between abnormal event and profile variation. We also found a linear trend in the left-edge position of the averaged profiles between the first and third events as well as after the third event, suggesting the existence of a slow-drifting mode between the two major events. The second event has a comparatively small shift in phase and is thus categorized as a "small flare state". During the third event, a sequence of approximately nine pulses was seen to significantly weaken in all frequency bands, likely associated with the pseudo-nulling observed at 150 MHz.A three-component de-composition analysis of the normal averaged profiles shows that the trailing component is dominant at our observing frequencies, while the centre component has a comparatively steeper spectrum. We found the overall flux density in an abnormal event to slightly differ from that in an ordinary state, and the difference shows a frequency dependence. A comparison of the normal, abnormal and dimmed averaged profile indicates that the leading component is likely to be stable in all states.

摘要： With the largest dish Five-hundred-meter Aperture Spherical radio Telescope(FAST), both the mean and single pulses of PSR B2016+28, especially including the single-pulse structure, are investigated in detail in this study. The mean pulse profiles at different frequencies can be well fitted in a conal model, and the peak separation of intensity-dependent pulse profiles increases with intensity. The integrated pulses are obviously frequency dependent(pulse width decreases by ~20% as frequency increases from 300 to 750 MHz), but the structure of single pulses changes slightly(the corresponding correlation scale decreases by only~1%). This disparity between mean and single pulses provides independent evidence for the existence of the RS-type vacuum inner gap, indicating a strong bond between particles on the pulsar surface. Diffused drifting sub-pulses are analyzed. The results show that the modulation period along pulse series(P3) is positively correlated to the separation between two adjacent sub-pulses(P2). This correlation may hint a rough surface on the pulsar, eventually resulting in the irregular drift of sparks. All the observational results may have significant implications in the dynamics of pulsar magnetosphere and are discussed extensively in this paper.

摘要： 当提及当下人气最高的帅哥时,总有几个名字是你无论如何也绕不过去的。随便一条微博就有几十万次的转发,在亚洲各国都深受粉丝追捧,泰国韩国演唱会门票瞬间售罄,备受时尚品牌青睐,频频出现在各大时装周前排,出任Coach代言人、成为Tiffany中国区品牌风格大使他是许魏洲。对于这一切,许魏洲大方地承认了自己的幸运,但这个新生代艺人非常清楚.

摘要： The edge cache is an effective way to reduce the heavy traffic load and the end-to-end latency in radio access networks(RANs)for supporting a number of critical Internet of Things(IoT)services and applications.It has been verified to provide high spectral efficiency,high energy efficiency,and low latency.To exploit the advantages of edge cache,a paradigm of fog computing-based radio access networks(F-RANs)has emerged to provide great flexibility to satisfy quality-of-service requirements of various IoT applications in the fifth generation(5G)wireless systems.

摘要： Theory and observations concerning the cosmic reionization epoch are briefly discussed in the context of recent observations attributed to dark matter. A case is made that cold ground state interstellar atomic hydrogen of average density of about one atom per cubic centimeter (1.67 × 10-21?kg·m-3?or 1.67 × 10-24?g·cm-3) appears to be the most likely candidate to explain these observations.

摘要： 本发明涉及基于GNU Radio的GPS软件接收机，属于卫星导航技术领域。本发明包括第一步：GPS天线模块接收到GPS信号后，经过低噪放大器与带通滤波器输出到射频模块；第二步：射频模块处理信号：根据奈奎斯特采样定理，对GPS C/A带宽的2倍进行带通采样，采样后的信号进行A/D转换后可以利用GNU Radio提供的USRP硬件驱动UHD将数据进行本地保存以进行后处理；本发明利用GNU Radio软件架构，采用面向对象的编程思想，结合GNU Radio提供的信号处理模块，将信号的捕获、跟踪以及后续的导航解算在通用处理器上编程实现，使用GNU Radio提供的scheduler进行多线程调度管理实现多通道处理可以达到实时性能，并且相比于硬件接收机，可以进行算法升级，便于软件开发，具有很大的灵活性与可扩展性。

摘要： 本发明涉及一种基于GNU Radio实现ZigBee与Wifi互操作方法，属于无线通信技术领域。该方法步骤：在GNU Radio软件无线电平台上，设置参数，接着在与解调后的信号做差后连接时钟恢复模块进行时钟恢复然后输出符号数据，在模块Packet Sink模块实现了物理帧的检测，并在数据包长度字段的帮助下解码整个MAC协议数据单元；完成ZigBee MAC帧到WiFi MAC帧的转变；将封装好的数据帧送入WiFi PHY模块进行信号的调制，然后送入到USRP中发出。本发明解决了ZigBee传输速度过慢的问题，提高了对ZigBee的可操作性，传输距离更远，速率更大，方便与用户终端互联。

摘要： 本发明提供基于张量填充的室内位置指纹定位Radio Map建立方法，属于室内定位导航技术领域。本发明首先根据需要定位的室内环境，建立平面二维直角坐标系、部署无线路由器作为接入点、均匀设置参考点位置；然后构造每条采集路径对应的二维Radio Map，并将全部测量路径对应的二维Radio Map构成一个3模张量；最后基于张量填充算法对参考点进行扩充。本发明解决了现有众包建立Radio Map技术存在每个数据包覆盖参考点数量少，从而导致定位精度较低的问题。本发明可用于室内位置指纹定位。

摘要： 一种基于UE速度的Radio Map分类定位方法，本发明涉及基于UE速度的Radio Map分类定位方法。本发明的目的是为了解决在海量用户LTE定位背景下，针对UE低速运动时信号指纹较短、UE高速运动时指纹失配现象严重，导致定位精度低的问题。具体过程为：一、获取DT/CQT/MDT采样点；二、对一获取的DT/CQT/MDT采样点提取RSRP共生向量；三、根据步骤二设计基于Adaboost分类算法的强分类函数；四：利用三中训练得到的强分类函数构建离线Radio Map；五、利用三中训练得到的强分类函数和步骤四得到的离线Radio Map进行在线定位。本发明用于定位领域。

摘要： 本发明提供基于张量重建的室内位置指纹定位Radio Map建立方法，属于室内定位导航技术领域。本发明首先根据需要定位的室内环境，建立平面二维直角坐标系、部署无线路由器作为接入点、均匀设置参考点位置；然后构造每条采集路径对应的二维Radio Map，并将全部测量路径对应的二维Radio Map构成一个3模张量；再基于张量填充算法对参考点进行扩充；最后基于张量恢复算法对众包数据进行降噪。本发明解决了现有众包建立Radio Map技术存在每个数据包覆盖参考点数量少、采集数据包含大量噪声，从而导致定位精度较低的问题。本发明可用于室内位置指纹定位。

摘要： 本发明公开了一种基于SOUP和GNU Radio的软件定义无线电开发平台，它包括天线、SOUP、PCIe2.0 X4和计算机，天线将射频信号传递给与其相连的SOUP内的信号源，SOUP与计算机通过PCIe2.0 X4连接，SOUP将处理射频信号后得出的数据流通过PCIe2.0 X4传送到计算机内，计算机内安装有处理上述数据流的GNU Radio，使用基于SOUP和GNU Radio的软件定义无线电开发平台能够进行通信系统的开发和研究，SOUP用作通信系统中的射频前端部分和数字前端部分，GNU Radio用作数字信号处理部分。本方案提供一款低成本、高效率、可重复使用的无线通信开发系统，本系统既能保证无线通信信号处理的速度，对其软件平台部分还支持免费升级和维护。

摘要： 本发明公开了一种基于SOUP和GNU Radio的软件定义无线电开发平台，它包括天线、SOUP、PCIe2.0X4和计算机，天线将射频信号传递给与其相连的SOUP内的信号源，SOUP与计算机通过PCIe2.0X4连接，SOUP将处理射频信号后得出的数据流通过PCIe2.0X4传送到计算机内，计算机内安装有处理上述数据流的GNU Radio，使用基于SOUP和GNU Radio的软件定义无线电开发平台能够进行通信系统的开发和研究，SOUP用作通信系统中的射频前端部分和数字前端部分，GNU Radio用作数字信号处理部分。本方案提供一款低成本、高效率、可重复使用的无线通信开发系统，本系统既能保证无线通信信号处理的速度，对其软件平台部分还支持免费升级和维护。

摘要： 本发明公开了基于DC‑CGAN的指纹定位Radio Map扩充方法，该方法首先在目标区域建立位置坐标系和部署无线路由器作为接入点，并且均匀设置参考点位置，在参考点处采集RSS数据建立原始Radio Map。DC‑CGAN的建立一方面利用Wasserstein距离和梯度优化进行约束，从而解决训练不稳定和模式崩溃的问题，另一方面利用欧式距离进行约束，从而获得与真实RSS数据更相似的生成RSS数据。将DC‑CGAN应用于Radio Map扩充，在两个参考点中间设置一个插值点，用原始Radio Map训练DC‑CGAN从而估计插值点处的RSS数据，得到生成的Radio Map，实现对Radio Map的扩充。本发明与现有的技术相比，仅用在一定数量参考点处真实采集的RSS数据，就能插值建立Radio Map，节省了人力和时间成本，可用于室内指纹定位。

摘要： 公开了一种用于在无线电接收机中处理数字音频广播信号的方法，所述方法包括：接收混合广播信号；解调混合广播信号以产生模拟音频流和数字音频流；并且使用模拟音频流和数字音频流的包络的归一化互相关来测量模拟音频流和数字音频流之间的时间偏移。时间偏移可以用于对准模拟音频流和数字音频流，以便随后将无线电接收机的输出从模拟音频流混合到数字音频流或从数字音频流混合到模拟音频流。

摘要： 为了解决网络数据传输过程中的数据安全问题，本发明提供了一种基于USRP和Gnuradio的加密传输系统。首先以常用的AES加密算法为基础对文件数据进行加密，有速度快、内存需求低、灵活、易维护等优点，且避免密钥在无线信道中传输，提高安全性能；以自动请求重传协议作为通信协议，提高数据传输的可靠性；以GNU radio软件为开发环境，适用于多数通信系统，对无线通信中发送与接收端的信号进行编解码、GMSK调制解调，时域频谱等处理；以USRP为硬件平台，对信号及数据进行处理并发送与接收，可实现基于软件无线电平台的加密传输系统。