Distributed coherent radar angle measurement method
A coherent radar and distributed technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as low accuracy, ambiguity in angle measurement, and high-precision angle estimation without ambiguity, and achieve high-precision estimation and release of angle measurement blur effect
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[0017] Implementation process of the present invention and information processing such as figure 2 As shown, the specific description is the following process:
[0018] S1 element-level beamforming: one-dimensional distributed linear array structure such as figure 1 As shown, the number of sub-arrays is N, and each sub-array is a uniform linear array composed of M array elements, M and N are both even numbers, the inter-array spacing d=λ / 2, and the sub-array spacing is D , the target incident angle is θ 0 . In receive coherent mode, all transmitting units transmit the same signal and achieve in-phase superposition at the target. Assuming that the signal envelope after being reflected by the target can be expressed as a(t), assuming that the mth (m=1,2 ..., M) Delay τ of array elements nm It can be expressed as:
[0019]
[0020] Among them, r 11 Indicates the delay of the first element of the first sub-array, and c indicates the propagation speed of electromagnetic ...
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