Arrangement for reducing the effect of doppler shift on radio reception
First Claim
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1. An antenna arrangement for use in a vehicle, comprising:
- a plurality of antenna elements;
means for moving the antenna elements in relation to the vehicle; and
switching means arranged to selectively switch one of said plurality of antenna elements into use at a time, wherein the means for moving the antenna elements are arranged to move the antenna elements in relation to the vehicle into a direction which is opposite to a direction of movement of the vehicle, and wherein the switching means are arranged to switch into use an antenna element for which the sum of velocity components caused by the velocity of the vehicle and the velocity of the antenna element in relation to the vehicle is closest to a predetermined value.
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Abstract
An antenna arrangement is provided for use in a vehicle. It comprised an antenna element (601-606, 701a-704f, 901-907, 1203) and means (600, 801, 802, 803, 804, 900, 910, 1200, 1201, 1202) for moving the antenna element in relation to the vehicle. The means for moving the antenna element are arranged to move the antenna element in relation to the vehicle into a direction which is opposite to a direction of movement of the vehicle.
10 Citations
11 Claims
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1. An antenna arrangement for use in a vehicle, comprising:
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a plurality of antenna elements;
means for moving the antenna elements in relation to the vehicle; and
switching means arranged to selectively switch one of said plurality of antenna elements into use at a time,wherein the means for moving the antenna elements are arranged to move the antenna elements in relation to the vehicle into a direction which is opposite to a direction of movement of the vehicle, and wherein the switching means are arranged to switch into use an antenna element for which the sum of velocity components caused by the velocity of the vehicle and the velocity of the antenna element in relation to the vehicle is closest to a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna arrangement for use in a vehicle, comprising:
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a plurality of antenna elements;
means for moving the antenna elements in relation to the vehicle; and
switching means arranged to selectively switch the plurality of antenna elements into use and out of use so that only one of said plurality of antenna elements is in use at a time, wherein the means for moving the antenna elements are arranged to move the antenna elements in relation to the vehicle, and wherein the switching means are arranged to switch into use an antenna element for which the velocity of the antenna element in relation to ground is closest to a predetermined value.
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Specification