Aiming at the current requirement for analyzing the radar original zero-intermediate frequency data, it is important to realize rapid data recording for multichannel radar with low cost. By analyzing and actually testing the building process of the 3-layer-link for protocol SRIO ( Serial Rapid IO) , the radar data interface based on optical fiber was designed; the interconnection of SRIO protocols from radar processor to data recording card between different FPGA manufacturers Xilinx and Altera was solved, and interface conversion for PCIe protocol and ping-pong data recording system based on paging DMA control were designed, which achieved the normalization of data transmission interfaces and rapid data recording with low cost and high reliability. The accomplishment of this system solved several problems such as mass data, tmultitudinous data channels and remote transmission between the radar and the record end in the acquirement of the measured data for the new system radars.

Most of the existing load-balancing middleware adopt the single object-based load balancing granularity,and pay more attention to the balance among the different replicas of the same object group,which can not meet the demands of the complex data application involved in radar simulation.Therefore,in terms of the technique of common object request broker architecture(CORBA),this paper presents a model of highly scalable load-balancing middleware by using the load balancing granularity based on the portable object adapter(POA) and illustrates numerous key techniques,solutions and their implementations related to the proposed model,including the extensions of load strategy and load metrics,etc.Experimental results show that the proposed model can reduce effectively the average response time and increase the total throughout as well.

为实现野外环境下多通道声阵列远程采集与声场分析,基于USB2.0高速接口,设计实现了单节点最多96个音频信道的同步采集,并基于Wi-Fi无线传输协议802.11n,实现了采集数据的远程无线传输.测试结果表明,本系统的USB2.0高速接口有效数据传输速度最小峰值读/写达到26.5 MBps/22.5 MBps,无线传输速度稳定均值达到106 Mbps.系统除采集卡外,其他设备均采用COTS产品,具有低成本、短研发周期和高可用性的优势.

In this paper,we present and realize a CORBA based high scalable load-balancing middleware model by using per-POA load balancing granularity and the key design challenges including scalable load balancing strategy and load metrics etc.

Pulse compression processing time is serious for tremendous data in space-time adaptive processing (STAP) system. A fast implementation algorithm of tremendous data is presented by optimizing scheme from data level and instruction level based on single DSP, and by suitably scheduling the processor resource and using parallel techniques. The method for commercial library and the method of this paper are compared. The result shows that the speedup ratio is 1.801, the error is controlled at the 10-5 level, and the time of 1024 points pulse compression is 50.456 μs, thus verifying the validity of the method.

Real time processing is a technical challenge for high precision implementation of space time adaptive processing (STAP) system with tremendous dataflow. Considering the requirements, the design objective is to decrease latency and to increase throughput of system. The compact parallel implementation of STAP system for dual-channel airborne radar is studied in this paper. Different scheduling methods are tested in two designed architectures based on the selected platform called as RLPGS structure and RLSGP structure. The real system demonstrates well on a single processing board, the performance meets the system requirement.

Based on the characteristic of the beam-width changing with beam scanning angle in the airborne phased-array PD radar, a wave form design method is proposed. The method focuses on determination of N M rule, pulse repetition frequency(PRF) boundary and restriction condition. Then all the parameters of three sections are analyzed in detail, the relations of parameters are illuminated, and the process of method is given. Finally, an example is given to demonstrate the effectiveness of the proposed method. This paper is very useful to waveform design for phased-array PD radar.

Space-time adaptive processing(STAP) technique that is well-known in the area of airborne radars requires very high computing power.In order to meet the real-time requirements in STAP applications,Multi-DSP system is used.In this paper,a method is presented to design parallel algorithms of partially adaptive STAP approaches.Data remapping is used between successive computation steps of STAP.Task level parallelism is used for these steps.As an example,the method is applied to Element space post-Doppler STAP approaches.We also implemented the parallel STAP algorithm on a Multi-DSP system.The effectiveness of our implementation is demonstrated with experimental results.The STAP algorithm is highly signal processing oriented and hence executes efficiently on DSP-based systems.

This paper put forward an implementation method of a multi-channel audio sample system based on USB 1.1. This system overcomes the disadvantages of existent systems that the transfer of audio data will reduce the quality of video. Our test shows that this system is of high audio quality and low price.

A set of video-monitoring system based on PC hardware which using linux OS is designed and implemented. The structure of the system is analyzed. The driver for multi-channel video-capturing card and SDK are discussed in detail. All kinds of strategies used to advance the system's peformance are explained. At last, the validity and efficiency of this system are validated by a demo program.

This paper analyses the property of Windows CE.NET in application and development of embedded PC video surveillance system , discusses the design of system structure and its hardware and software components. Mainly, the paper discusses key techniques in the implementation of system from three aspects including quickly customing and building OS image NK.BIN, using WinDriver to develop video-capture card driver, and using DirectX for video preview. The process of system development is simple and efficient .The system performs steadily and has a good scalablility.

The application of the distributed and embedded real-time operating system QNX for embedded network video monitoring system based on PC hardware is analyzed,and such a system is designed,then the realizations of the driver for video-collection card and of the video playback software on QNX RTP 6.1.0 are introduced.The good performances of QNX such as real-time capability,stability,reliability and special support for PC hardware make the product get a very high rate of performance and price.