搜索结果: 91-105 共查到“知识库 信号检测”相关记录1130条 . 查询时间(1.624 秒)
All Optical NRZ-to-RZ conversion for 43-Gbps Signals for Generation of 172-Gbps OTDM Signals Using Intersubband Transition MQW Optical Gate
Generation OTDM Signals Intersubband Transition MQW Optical Gate
2015/7/14
We demonstrate all optical NRZ-to-RZ conversion at a bit rate of 43 Gbps using an intersubband transition optical gate. The converted 2-ps RZ pulses were successfully applied to generate 172-Gbps OTDM...
实现快速故障保护的IGBT驱动电路
HCPL-316J IGBT 驱动电路 故障保护
2016/10/12
针对较复杂的变流系统中，主控系统的延滞会影响IGBT 模块故障保护失败的问题，设计一种快速故障 保护的IGBT 驱动电路。分析了现有应用方式存在HCPL-316J 2 个输入端中的另一个端子的功能没有得到充分利用 的缺陷，通过对HCPL-316J 的信号输入端Vin+、Vin-和故障信号反馈端FAULT 的应用研究，改进为FAULT 信号反 馈回另一个输入端子，光耦芯片故障信号发出后立即封锁IGB...
基于联合稀疏功率谱恢复的机载雷达稳健STAP算法研究
机载雷达 空时自适应 稀疏恢复 离群点
2016/12/24
机载雷达信号的空时自适应处理（STAP，Space-Time Adaptive Processing）需要利用样本数据来估计杂波协方差矩阵.非均匀杂波环境中的离群点会使协方差矩阵的估计出现偏差，从而导致信号相消现象.针对此问题，本文提出一种基于联合稀疏功率谱恢复的STAP算法（JSR-STAP）处理非均匀杂波，以克服离群点对正侧视模式机载雷达的STAP性能的影响.JSR-STAP算法在高分辨稀疏恢...
激光主动成像结合距离选通技术的零时信号测量方法
零时信号 激光主动成像 距离选通 光流
2016/7/29
针对火箭起飞过程中零时信号难以准确测量问题,提出了激光主动成像与距离选通技术相结合的测量方式,并通过求取光流的变化进而求取位移移动量获得火箭起飞的零时信号。对现有的零时信号测量方式进行了分析,确定了基于距离选通的ICCD成像方式,结合目标垂直上升的特性,提出目标轮廓与HS光流结合的抗光照干扰算法。实验结果表明:在模拟目标匀速上升过程中,在光照变化不大情况下,单独的边缘检测及单独的HS光流检测算法均...
A new method of sensing the vibrational motions of a exible structure by measuring the di erence in GPS (global positioning system) carrier phase at separate antennas on the structure is presented.
The Effects of the Ionosphere and C/A Frequency on GPS Signal Shape:Considerations for GNSS-2
Effects Ionosphere C/A Frequency GPS Signal Shape Considerations
2015/6/29
By greatly increasing the chipping rate of the pseudo random noise (prn) code, it may be possible to measure the ionosphere (TEC) in near real time, by exploiting the dispersive nature of the ionosphe...
Interference presents a challenge in the use of GPS for aircraft high precision approach, by posing a threat to the accuracy and integrity of the GPS navigation solution.Such interference may result f...
A Proposed Signal Design for GNSS2:The Use of Faster and Longer Codes to Provide Real-Time Single Frequency Ionospheric Measurements
Signal Design GNSS Longer Codes Real-Time Single Frequency Ionospheric Measurements
2015/6/29
The design of GNSS2 presents the international navigation community a unique opportunity to design a signal for more precise positioning than is currently available with GPS and GLONASS. Faster and lo...
High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals
High Integrity Carrier Phase Navigation LAAS Multiple Civilian GPS Signals
2015/6/29
In near future, there will be two more civilian GPS signals,at 1227.60 MHz and 1176.45 MHz, in addition to thepresent one at 1575.42 MHz. Of many possible benefits from the three civilian signal...
Narrowband receivers are more robust to narrowband interference and to GPS signal faults, but they tend to have relatively poor multipath performance. Few current techniques are capable of mitigating ...
In this paper, we examine considerations involved in data transmission schemes on LORAN. Given the considerations, we propose several schemes to encode data onto the LORAN signal. One major purpose of...
Optimization of Cascade Integer Resolution with Three Civil GPS Frequencies
Cascade Integer Resolution Civil GPS Frequencies
2015/6/29
In the near future, there will be two more civil GPS signals in addition to the current one at the L1 frequency (1575.42 MHz). The second civil signal will be broadcast at the L2 frequency (1227.60 MH...
Burst Mode Message Loss Effects On WAAS Availability
Burst Mode Message Loss WAAS Availability
2015/6/29
The Wide Area Augmentation System (WAAS) is a GPS based navigation aid currently under development by the Federal Aviation Administration (FAA). WAAS will provide corrections to aviation users for the...
Aviation Utilization of Geostationary Satellites for the Augmentation of GPS:Ranging and Data Link
Aviation Utilization Geostationary Satellites Augmentation GPS Ranging Data Link
2015/6/29
The Wide Area Augmentation System (WAAS) is a GPS-based navigation aid currently under development by the Federal Aviation Administration (FAA). WAAS will providecorrections to aviation users for the ...
Transient Performance Analysis of a Multicorrelator Signal Quality Monitor
Transient Performance Analysis Multicorrelator Signal Quality Monitor
2015/6/29
The ability to monitor and detect problematic distortions in the received GPS-SPS signal is a task of critical importance. Detection of these satellite signal anomalies or “evil waveforms” (EWFs) can ...