The Hardware Design And Implementation Of The Monitoring Receiver Based On OMAP-L138

In recent years, with the gradual development of the radio monitoring network, radio monitoring equipment also evovled from the local large fixed equipment monitoring mode to the miniature flexible device and networking mode. Many miniature outdoor monitoring stations constitute grid monitoring network through interconnections, and are simultaneously controlled by monitoring software running in the central station. In addition to make up for the area that the existing monitoring network can’t cover, the new radio monitoring equipment but also implement positioning through the time difference. This thesis, based on the actual demand, develops a monitoring receiver hardware platform, which is based on OMAP-L138 core and can work in networking mode.This paper has a simple analyse about the structure of the networked spectrum monitoring and control system firstly, such as the the main compositions and functions. At the same time the basic functions and the corresponding technical indicators of the monitoring of the receiver has been discussed and the whole hardware system architecture has been designed, which is based on the analyses of the signal processing data flow of the monitoring receiver. In the following, this paper has described the specific circuit design of monitoring receiver modules in detail, including RF(Radio Frequency) front-end, AD(Analog to Digital), FPGA(Field Programmable Gate Array), OMAP-L138, DDR2(Double Data Rate 2 Sdram), network interface system power supplying module clock module and so on. The RF front-end is responsible for receiving the radio signal in space and shift it to a fixed intermediate frequency signal. The AD module completes the conversion of the signal form analog to digital. FPAG and OMAP-L138 provide the hardware support for the implementation of digital signal processing algorithm of the system. The network interface is used to connect the monitoring receiver and the PC. The DDR2 is a store expansion of the system, ensuring the operation of the system with enough storage space.And then the design of driver softwares for data transmission channel interface McBSP(Multichannel Buffered Serial Port) and uPP(universal Parallel Port) has been elaborated in detailed, making the corresponding interface working normally according to the specified format, which supply the surport for the system’s data stream transmission.Finally under the existing experiment condition, the main modules of the system are tested and analysed and the hardware and software integration and joint debugging is completed.