| Popis: |
The permitted limits for measurement of the coordinates of shell-beacon on a trajectory by means of the phase-difference passive radar system are theoretically defined. Analytical relationships between the phase difference of radio waves, which comes from the beacon to two and three spaced antennas and the distances for beacon-antennas and antenna-antenna are established. These dependencies are investigated for cases of placing of two or three antennas on a line perpendicular to the direction of linear motion of the beacon. It is shown that the use of the beacon with a frequency radiation of 433 MHz and of the phasemeter based on the chip of AD8302 allows, at the distance between two antennas equal to length of half-wave or wave length of 0.693 m, to measure the beacon-antenna distance within 30-120 m. By increasing the distance between antennas to 3-5 of wave lengths there can be achieved the edistance measuring of the order of 1000-3000 m. Presence of three eantennas allows to use one pair of antennas to measure small distances, and these second pair – large distances. |
