초록 ▼

A satellite tracking antenna system comprises three or four plane antennas juxtaposed on a single plane. A first and a second antenna are juxtaposed in an azimuth direction, and a phase difference between signals received by these antennas is detected in order to determine a declination of an antenn

A satellite tracking antenna system comprises three or four plane antennas juxtaposed on a single plane. A first and a second antenna are juxtaposed in an azimuth direction, and a phase difference between signals received by these antennas is detected in order to determine a declination of an antenna unit with respect to the satellite as viewed in the azimuth direction. The first and a third antenna are juxtaposed in an elevation direction, and a phase difference between signals received by these antennas is detected to determine a declination of the antenna unit with respect to the satellite as viewed in the elevation direction. The antenna unit is driven so as to reduce these declinations to zero. Stated differently, values of a sine and a cosine function are extracted which have a phase difference between signals received by a pair of antennas as a parameter, and a tangent value representing the ratio therebetween is calculated and is then inversely converted to provide phase difference information.

대표청구항 ▼

An antenna system comprising an antenna support; drive means for driving the antenna support for rotation about a single axis; a first and a second antenna mounted on the antenna support and spaced apart from each other in the direction of rotation, the first and the second antenna having respective

An antenna system comprising an antenna support; drive means for driving the antenna support for rotation about a single axis; a first and a second antenna mounted on the antenna support and spaced apart from each other in the direction of rotation, the first and the second antenna having respective directivities which are oriented parallel to each other; functional value detecting means for detecting a value of a first function and a value of a second function which is orthogonal to the first function, each of the functions including a phase difference of the signal received by the second antenna with respect to the signal received by the first antenna as a parameter; and control means for detecting the phase difference in terms of a ratio of a value of the first function to a value of the second function, and for determining a quadrant in which the phase difference is located from the positive or negative polarity of the values of the first and the second function, the control means energizing the drive means in the direction to reduce the detected phase difference and a declination of the directivity of the first antenna with respect to the travelling direction of the wave in the associated quadrant substantially zero.