Array Reconnaissance Measurements To The Experimental System Software Research

This dissertation develops research work for some fields in which array processing technique may be used for reconnaissance and direction finding, software design of high-speed signal processing terminal based on four TMS32OC4O chips for array reconnaissance and direction-finding system are completed. The main work in this dissertation can be summarized as follows: 1. High-speed implementing of array reconnaissance and direction-finding algorithm In signal processing, the sampling rate of AiD always conflicts with the speed of digital signal processing, so high-speed DSP chips are needed to eliminate the conflict. For narrow band signal, generally, the time cost by sampling a group of data is about a few milliseconds, but the processing time cost by PC is about a few seconds, it is obvious that the speed of digital signal processing by PC lags behind the high speed sampling rate by far. For this, a series of algorithm for array reconnaissance and direction-finding are implementing in high-speed DSP parallel processor which is based on four TMS32OC4O chips, so that the real-time demand of reconnaissance and direction-finding is met. 2. Software design of supervising terminal Supervising terminal functions the input/output interface and controls the working flow of the whole equipment. There are two key parts in corresponding software design: (1) Virtual device driver ( VxD ) technique Since Windows9x shields the system low-level operation (such as directly physical memory accessing, hardware and software interruptions, etc.), virtual device driver technique has to be employed to work around the difficulty of directly accessing physical memory caused by using the data- sampling card under the safe mode of Windows9x. (2) Dynamic data exchange ( DDE) technique Figures such as space spectrum, frequency spectrum, etc., need to be shown II in the result. Due to high efficiency of Matlab抯 drawing functions, we want to employ Matlab to draw the figures. Using a supervising terminal, which acts as the client, to interact with Matlab and get desired figures from it using the DDE technique, we can show those figures on the supervising terminal. All those will make the user-machine interface more friendly. 3. Simulation experiments of array reconnaissance and direction-finding system The target signals and signals impinged on antenna array sensors are generated by computer, we use these data to test performance of array reconnaissance and direction-finding system. From experiment results, we conclude that the array reconnaissance and direction-finding system has performance of high precision, high resolution, signal dialysis and modulation mode recognition.