The Algorithm Research And Application In Wireless Direction Finding And Location

With the rapid development of radio communication technology, and the correspondingly growing range and density of airwaves, wireless direction finding (DF) and location have been applied in more and more fields. To locate an unknown jamming signal source, two or more fixed stations are connected through network. Existed algorithms effect on extending DF range and enhancing location precision in part. However, it is impossible to superpose estimator over actual value because of various errors, or eliminate the error. Moreover, there is still a large error area of probability ellipse, which makes the precise location cannot available.This paper, in the spherical reference frame, discusses some actual problems about DF and location, through two stations, three stations and many stations. The first step is to correct the original DF data before locating. The corrected equation in this paper takes azimuth error and quality into account, and also educes the expressions of weight through long-time statistic. When corrected azimuths are used to locate, estimator will incline ultimately to actual value with tiny error.This paper improves basic algorithm. The parameters, such as azimuth expectation and deviation, azimuth cross-angle and DF quality, are adopted to compute individually the maximum probability point, that is the optimal point of crossing location. Meanwhile, this paper analyzes location error, calculates errorprobability ellipse, and proves the estimate is the least square unbiased one. The algorithm proposed in this paper has been put into practice and the result shows that the location precision has been obviously enhanced.