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Three-dimensional space bistatic/multistatic radar high-speed target detection method

A three-dimensional space, high-speed target technology, applied in the field of three-dimensional space bistatic/multistatic radar high-speed target detection, can solve the problems of poor bistatic radar adaptation performance, target Doppler frequency migration, and insufficient algorithm accuracy, etc., to achieve Excellent target information acquisition ability, improved estimation accuracy, and improved signal-to-noise ratio

Pending Publication Date: 2020-08-18
XIDIAN UNIV
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  • Description
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Problems solved by technology

At present, the echo model used in most articles is a two-dimensional echo model. This model requires the target trajectory to be coplanar with the bistatic radar baseline, which cannot satisfy all target movement conditions. The long-term accumulation algorithm proposed for this model Poor adaptation to bistatic radar
[0004]Affected by the geometric configuration of the bistatic radar and the strong maneuverability of the target, the Doppler frequency migration of the measured target is serious. The cubic phase function ( CPF) involves integral calculations, and the amount of calculation is large, and the suppression of cross terms is limited to multi-component linear frequency modulation signals. In order to reduce the amount of calculation, there are low signal-to-noise ratios obtained through non-coherent accumulation estimation of target parameters, and insufficient algorithm accuracy. question

Method used

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Embodiment 1

[0026] The bistatic radar transmitting station and receiving station are separated, and the receiving echo delay is the result of the interaction between the target and the range history of the transmitter and receiver respectively, which makes the bistatic radar more prone to range migration and For Doppler frequency migration, the target echo accumulation time spans multiple range units and Doppler units. At the same time, bistatic radar faces difficulties such as low radar cross-sectional area of ​​the target signal and strong mobility, so it cannot achieve effective target detection and parameter estimation. Aiming at this current situation, the present invention has carried out research, and proposed a kind of 3D space bistatic / multistatic radar high-speed target detection with lower cost, suitable for 3D model of bistatic radar, which can improve the signal-to-noise ratio of echo and has higher precision. method, that is, the joint detection and parameter estimation meth...

Embodiment 2

[0037] Three-dimensional space dual / multistatic radar high-speed target detection method is the same as embodiment 1, adopts generalized second-order Keystone transform to correct the distance migration of target echo signal in step (4), specifically includes:

[0038] 4a) In the three-dimensional space, the moving transmitting station transmits the chirp signal, after reaching the high-speed and high-maneuvering target, it is reflected by the target, and finally reaches the moving receiving station. The specific parameters are set as follows. The coordinates are (0,0,L T ) of the bistatic radar launch station, the flight velocity vector of the launch station is The acceleration vector is The transmitted chirp signal S t (t) via the initial position at (x 0 ,y 0 ,z 0 ), the target flight velocity vector is The flight acceleration vector is After the target P is reflected, it reaches the receiving station of the bistatic radar; the initial position of the receiving s...

Embodiment 3

[0057] Three-dimensional space dual / multistatic radar high-speed target detection method is the same as embodiment 1-2, and will eliminate the signal S of distance migration in the step (5) of the present invention 3 (f,t a ) do inverse Fourier transform along the fast time dimension to extract the data S(t a ), specifically include the following steps:

[0058] 5a) Extract the signal S with distance migration eliminated 3 (f,t a ) distance time dimension data|S 3 (t,t a )|:

[0059] |S 3 (t,t a )|=abs[IFFT(S 3 (f,t a ))]

[0060] Among them, IFFT is the inverse Fourier transform along the fast time dimension, and abs(·) is the absolute value operation.

[0061] 5b) Echo data extraction in the distance unit where the target is located: the signal without distance migration has a constant number of distance units in the time domain, and the signal data at this distance unit is:

[0062]

[0063] where σ 1 is the signal amplitude, It is an operation to obtain t...

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Abstract

According to a three-dimensional space bistatic / multistatic radar high-speed target detection method disclosed by the invention, the problems of high-speed target detection and motion parameter estimation in the three-dimensional space are solved. The method comprises the following steps: acquiring a radar echo signal; acquiring a radar baseband signal; acquiring a frequency domain pulse pressuresignal; correcting the range migration of the target echo signal by adopting generalized second-order Keystone transformation; obtaining data of a distance unit where the target is located; correctingDoppler frequency migration of the target echo signal by adopting a product type three-order phase function; and carrying out azimuth accumulation on the signals and estimating motion parameters. According to the invention, range walk, range bending, Doppler migration time primary term and time secondary term are corrected at the same time; according to the geometric space characteristics of thebistatic radar and the target, various parameters of the target are well estimated, the parameter estimation precision is higher, the probability of successfully distinguishing the target is higher, the cost is lower, the application range is wider, and the method is used for high-speed high-maneuverability target detection and motion parameter estimation in a three-dimensional space.

Description

technical field [0001] The invention belongs to the technical field of bistatic / multistatic radar, and particularly relates to target detection and parameter estimation, and specifically relates to a high-speed target detection method for bistatic / multistatic radar in three-dimensional space, which is used for detecting high-speed, high-mobility weak targets under the dual / multistatic radar system. detection and parameter estimation. Background technique [0002] Different from the monostatic radar, the transmitting station and the receiving station of the bistatic radar are separated, and the receiving echo delay is the result of the interaction between the target and the range history of the transmitter and receiver respectively. Similarly, the distance migration of the target echo is also the target The sum of the effects of the radial movement relative to the transmitter and the radial movement relative to the receiver makes the bistatic radar more prone to range migrati...

Claims

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Application Information

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IPC IPC(8): G01S13/00G01S7/41
CPCG01S13/003G01S7/41
Inventor 张娟丁彤刘欣让张林让
Owner XIDIAN UNIV
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