Method for determining the position, notably in terms of elevation, of a target flying at very low altitude
First Claim
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1. Method for determining by an electromagnetic detection system an elevation of a target close to a ground, comprising the steps of:
- receiving, by a reception antenna, a first signal emitted directly by a target;
receiving, by the reception antenna, a second signal emitted by the target towards the ground then reflected by the ground toward the electromagnetic detection system, wherein the reception antenna comprises a plurality of sub-arrays of radiating elements;
sampling an interference signal produced by the first signal and by the second signal at the level of the sub-arrays, to produce a sampled interference signal; and
determining the elevation of the target from an amplitude of the sampled interference signal,wherein a frequency f of the sampled signal is a value which minimizes a function;
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Abstract
The present invention relates to a method for determining the position notably the elevation of a target flying at very low altitude. An electromagnetic detection system extracts the measurement of the elevation on the basis of the amplitude of the interference signal produced by a signal emitted directly by the target and by a signal emitted by the target towards the ground then reflected by the ground towards the radar. Embodiments of the invention can notably be used within the framework of the guidance of drones in the final landing phase.
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Citations
14 Claims
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1. Method for determining by an electromagnetic detection system an elevation of a target close to a ground, comprising the steps of:
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receiving, by a reception antenna, a first signal emitted directly by a target; receiving, by the reception antenna, a second signal emitted by the target towards the ground then reflected by the ground toward the electromagnetic detection system, wherein the reception antenna comprises a plurality of sub-arrays of radiating elements; sampling an interference signal produced by the first signal and by the second signal at the level of the sub-arrays, to produce a sampled interference signal; and determining the elevation of the target from an amplitude of the sampled interference signal, wherein a frequency f of the sampled signal is a value which minimizes a function; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification