A design method for ultra-low sidelobe to the ground
An ultra-low sidelobe, design method technology, applied in diversity/multi-antenna systems, space transmit diversity, transmission systems, etc., can solve problems such as difficulty in optimizing large-scale arrays, declining optimization capabilities, and easy to fall into local optimal solutions.
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[0064] Embodiment: except that the main beam is required to be located within the earth region, the sidelobe suppression of the earth region at any elevation direction scanning angle is greater than 40dB, and the suppression of all sidelobes except the earth region is greater than 17dB.
[0065] Step 1: Establish a coordinate system.
[0066] The earth coordinate system is established with the z-axis perpendicular to the front and pointing to the earth, where the off-axis angle θ (ie, the scanning angle in the pitch direction) is defined as the angle with the z-axis, and the azimuth angle Defined as the angle between the xoy plane and the x axis.
[0067] Step 2: Determine the Earth region.
[0068] Assuming that the orbit height of the satellite from the ground is H=36000km, and the radius of the earth is R=6400km, then the earth region is defined as a cone-shaped region with the off-axis angle α as the half-cone angle, such as image 3 As shown, where α=arcsin[R / (R+H)]=9°...
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