In this paper, a test platform for baseband signal processing module of ADS-B is introduced, which is simple and efficient. The baseband signal processing module of ADS-B used in receiving system of ADS-B analyzes 1090ES ADS-B message of baseband. In order to reduce the risk of technology and business, it is necessary to ensure that the signal processing module of ADS-B works normally before delivery. The test platform based on hardware-software co-design architecture may make sure the signal processing module of ADS-B works normally and locate some hardware fault.
To achieve the flexibility and reusability of design and the excellent balance between performance and consumption, design and realize IP Compiler for DDS core based on Triangular approximation ROM compress technique. Finally it also shows the test results of the IP Compiler. It is verified by practice that the DDS circuits produced by the complier run steadily and perform excellently in most of the digital transmitters.
Circuit area and processing speed have been an important issue in digital logic design. This paper proposed a novel folded systolic architecture for symmetric FIR digital filter. With the symmetry properties of coefficients the proposed architecture and design method have flexibility which can balance filter circuit area against processing speed and only a single type of systolic cell is required.
The digital innovation for transmitter is a key technology of MW&SW digital broadcasting technology. The paper studies the digital innovation for DX transmitter based on the principles and structures of DX series MW transmitters which are employed widely. The design of a transmitter innovation scheme, the adapter circuits of transmitter for digital broadcasting and the software are provided in this paper. The implementation of digital DX transmitter is achieved successfully. The discussion of the principle of DX MW transmitter and the key technologies for the digital innovation, the detail design and a final test result are also included in this paper.
There were great conflicts between medical demands on the one hand and the capacity of the health service provision in the first week of rescue after the Wenchuan Earthquake occurred on the other.It hence reveals the shortage of the triage in the emergency medical system of China.Some studies have noticed the problem,but most of them have focused on discussing the technology of triage.The present paper argues that the management problems of triage are even more serious.It firstly analyses the principles of triage in different emergency situations,and then discusses how to improve the implementation of triage during emergencies through the system construction in Chinese emergency management institutions.
A multi-band and polarization-insensitive metamaterial is proposed to harvest electromagnetic energy efficiently in three frequency bands.Based on a square resonant ring and cross resonant structure, a metamaterial is designed to achieve high energy harvesting efficiency of 81.2%, 93.3% and 93.5% at 2.45 GHz, 4.0 GHz and 5.8 GHz, respectively.The overall structure consists of an 8 × 8 periodic array of meta-cells with two vias loaded by two 50 resistors, an impedance matching network and a rectifier circuit.Results show that the simulated rectification efficiency of rectifier circuit reaches 69.2%, 58.8% and 52.1% at 2.45 GHz, 4.0 GHz and 5.8 GHz, respectively, when the incident power is 5 dBm.The measured harvesting efficiency (RF-DC) is found to be 51.6%, 54.2% and 58.7% with the TE polarization and 50.6%, 53.7% and 58.6% with the TM polarization incidence at the three operating frequency bands, respectively.Although the incident power is reduced to 0 dBm, the energy harvesting efficiency can still reach more than 42% in both TE and TM polarizations.Therefore, it is shown that the energy harvesting system can maintain high efficiency under different polarizations in a wide power range.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)
'/%3e%3cuse xlink:href='%23a' transform='rotate(144 450 300)'/%3e%3cuse xlink:href='%23a' transform='rotate(216 450 300)'/%3e%3cuse xlink:href='%23a' transform='rotate(288 450 300)'/%3e%3c/svg%3e)