An experimental system for measuring the parameters of the flight trajectory of its own object-radio beacon, in particular, in the unmanned aerial vehicle (UAV) is developed and tested. Passive radio-location system is used. The difference-phase, difference-time and difference-frequency methods are compared. The first one provides the sufficient precision, not more than 1 deg. in the range of 30 to 140 deg. The phase measuring device is based on chip AD8302, operating at the frequency range up to 2.7 GHz. The fulfilled assessment has underlined the ability to measure the trajectory of objects-radio beacons in range of several kilometers.
A set of measurements has performed under different conditions in near ground and free atmosphere. UAV flight in air, far from the surface of ground, provided a sharp decrease of an influence of surrounding radio noises. The deviation of the UAV flight line from the vertical axis of the antenna is possible due to the deflection of the UAV from this axis at altitudes of 100 or more meters due to strong winds at these altitudes and due to the possible deviation of the antenna axis from the vertical. Obtained experimental dependences of the phase difference on flight time of the UAV are satisfactory and describe the dependence of the phase difference of radio waves at 433 MHz. The narrow RF filter eliminates the impact of most RF sources such as radio broadcast stations, industrial noise. Geometrical shortcomings can be avoided by inclusion of photodetectors and horizontally leveling of antennas. The obtained results envisage the system’s suitability for localization of objects with radio beacons onboard in a range of several kilometers as well as the possibility of the proposed methodology application for measuring the coordinates of unknown UAVs and ballistic objects.
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