Aerial Observation Platform On The Sea Moving Target Single Station Passive Location Tracking, And Its Key Technologies

With the trend of emphasis on concealable attack and forcible ruin to military supporting systems, passive locating methods can be seen as an important direction to the development of locating methods and perfection to existing locating systems. Passive locating methods have the merits of far distance, concealable receiving and low probability to be detected, compared to active locating methods. So, passive locating system can help to improve viability and battle effectiveness of the whole system in the electronic war environment. It also has broad applying prospects in navigation, aviation, space navigation, scout, measurement, succor and geophysics.Conventional single-observer passive locating methods are low in speed and precision. Moreover, corresponding locating precision is sensitive to direction measurement errors, which puts forward high demands on measurement equipments impersonally. So it is a trend to explore new passive locating methods with high precision and speed. In this sense, the method with phase difference rate of change has broad developing prospects. The single-observer passive locating method with phase difference rate of change and some key technologies -are studied in this dissertation on the applying background of locating remote slow offing targets with fast plane. This dissertation is outlined as follows.In Chapter One, the present studies on single-observer passive location and tracking are reviewed. Several overseas experiment systems and existing passive locating methods are introduced.In Chapter Two, locating principle for phase difference rate of change is introduced in detail with corresponding expressions. Simulations show that this method is effective. Observability analysis and error analysis are also given.In Chapter Three, ambiguity elimination for phase difference measurement data is discussed. The reason for phase difference measurement ambiguity is analyzed on the particular applying background. Then two possible resolving methods are put forward with principles for ambiguity elimination. Corresponding demands on measurement methods and equipments are also given.In Chapter Four, smoothing of phase difference without ambiguity and acquiring of corresponding rate of change are studied. Three methods are introduced with simulations and the kalman filtering method is selected. Simulations also show that signals of the target should be received continuously and accurately.In Chapter Five, MGEKF algorithm is given to evaluate the velocity and position of the target. MGEKF equations are introduced in detail. Simulations show this algorithm is effective whether the target moves or not.In Chapter Six, the influence for flying posture change of the observer on locating process is studied. Two resolving methods are given. Simulations validate these two methods.In Chapter Seven, all studies in this dissertation are summarized and future directions are discussed.