Study On Direction Finding And Position With Five Channels Phase Interferometers

Passive direction finding of emitter source has been playing an important role in navigation, aviation, aerospace and electronic warfare with its outstanding features such as longer range and better concealment. Based on the configure of direction finding, the location method, algorithm, accuracy and performance for multistations and single station are studied in this thesis, and the computer simulation results are given out. It is important of resolving the performance of antenna array. A technique to estimate and calibrate the performance is developed in this page. Lastly we realized algorithm of calibrate the performance and five channels phase interferometer on high speed float DSP TMS320C6711 and achieved the performance index and real time implementation. The main contents are as following:The first chapter is a brief introduction to direction finding of its backgrounds, present states and importance.The second chapter summarized the principle of radio-communication direction finding, include compose and classify of radio-communication direction finding; the main performance index of radio-communication direction finding; shows the principle and character of four main kinds of direction finding system.The analysis of channel disaccord calibration discussed in Chapter 3. Analysis the cause of channel disaccord of gain and phase, give four methods of gain and phase calibration, computer simulation illustrate the that the methods are effective.In the Chapter 4,the basic relation of phase interferometer of one dimension, two dimensions, and the measurement accuracy and the approach of solving the phase ambiguity in the phase interferometers have been discussed in detail. The equations of target position and its errors in the satellite-born phase interferometer have been also derived.In the Chapter 5,we designed the interferometer direction finding system. It provides a brief overview of the background and major features of DSP, also describes the architecture of TMS320c671h software developing method. Lastly we realized the system.Finally, an overview of author's work and the prospect of direction finding are presented.