FDA-MIMO radar incremental distance-angle two-dimensional beam forming method

A technology of incremental distance and radar, which is applied in measuring devices, radio wave measuring systems, radio wave reflection/reradiation, etc., can solve problems such as mismatching and inability to accurately estimate target distance, and achieve improved detection performance and controllable The effect of high degree of freedom

Pending Publication Date: 2021-04-06
XIDIAN UNIV
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Problems solved by technology

Solve the problem that the target distance cannot be accurately estimated due to the mismatch between the actual steering vector and the ideal steering vector, effectively improving the target detection performance of FDA-MIMO radar

Method used

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  • FDA-MIMO radar incremental distance-angle two-dimensional beam forming method
  • FDA-MIMO radar incremental distance-angle two-dimensional beam forming method
  • FDA-MIMO radar incremental distance-angle two-dimensional beam forming method

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] Refer to attached figure 1 , the specific implementation steps of the present invention are as follows:

[0058] Step 1. Obtain the complex envelope s of the transmitted signal of the mth transmitting element of the FDA-MIMO radar m (t), where m=1,2,...,M, M represents the number of transmitting array elements;

[0059] (1.1) Introduce the frequency step Δf between the transmitting elements of the co-located MIMO radar, and obtain the signal frequency f of the mth transmitting element of the FDA-MIMO radar m :

[0060] f m = f 0 +(m-1)Δf,

[0061] Among them, f 0 is the first antenna, that is, the carrier frequency of the reference antenna;

[0062] (1.2) Each transmitting element sends a phase-encoded pulse consisting of P sub-pulses to obtain the transmitting waveform x of the mth element of the FDA-MIMO radar m (t):...

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Abstract

The invention discloses an FDA-MIMO radar incremental distance-angle two-dimensional beam forming method, which aims to realize accurate estimation of the distance of a target in each distance gate and improve the target detection performance. The method comprises the following steps of 1) acquiring a transmitting signal of an FDA-MIMO radar transmitting array element, 2) obtaining a receiving signal of a receiving array element after frequency mixing of a radar receiving end, 3) performing matched filtering on the transmitted waveform to obtain a sampling signal, 4) calculating a receiving signal vector after matched filtering of the radar receiving end, and 5) constructing a virtual steering vector according to the received signal vector, and finally obtaining an incremental distance-angle two-dimensional beam forming directional diagram. According to the method, the MIMO technology is adopted for the FDA array, joint beam forming is carried out at a receiving end, distance and angle decoupling is achieved, an antenna directional diagram dependent on the angle and the distance at the same time is generated, and incremental distance-angle joint detection and interference suppression of a target are achieved in a distance-angle joint domain.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a Frequency Diverse Array-Multiple-Input and Multiple-Output FDA-MIMO (Frequency Diverse Array-Multiple-Input and Multiple-Output) radar incremental range-angle two-dimensional beamforming method, which can be used for targets Distance parameter estimation and object detection. Background technique [0002] Frequency diversity array FDA (Frequency diverse array) radar introduces a frequency step much smaller than the operating carrier frequency between the transmitting elements, so that each antenna signal can obtain a time-varying phase difference at the same time point, resulting in distance-angle- Time-3D dependent emission pattern. Since the FDA's emission pattern at a fixed time presents a distance-angle coupling characteristic, that is, the controllable degree of freedom in the distance dimension is coupled with the angle information, so the two-dimen...

Claims

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Application Information

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IPC IPC(8): G01S7/42G01S13/42G01S13/72
CPCG01S7/42G01S13/42G01S13/72Y02D30/70
Inventor 兰岚祁佳炜廖桂生许京伟朱圣棋胡仕友
Owner XIDIAN UNIV
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