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 ste

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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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[0056]The invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057]Refer to the attachmentfigure 1 The specific implementation steps of the present invention are as follows:

[0058]Step 1, obtain the replenishment of the MiMo Radar Mth transmit signal transmitted signal of the FDA-MIMO radarm(t), where M = 1, 2, ..., M, M represent the number of emission regimes;

[0059](1.1) The frequency step amount Δf is introduced in each emission frame of the commonly located MIMO radar to obtain the signal frequency f of the FDA-MIMO radar first emission element.m:

[0060]flym= F0+ (m-1) Δf,

[0061]Where f0For the first antenna, the reception of the reference antenna;

[0062](1.2) Each transmitting element transmits a phase encoded pulse consisting of a P sub-pulse to obtain the emission waveform X of the MiMo Radar Mthm(t):

[0063]

[0064]Where the sub-pulse widthP Represents the number of sub-pulses; step functionsPhase encoding functionPhas...

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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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