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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 measured Doppler frequency migration of the target is seriou

Method used

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

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Example Embodiment

[0025] Example 1

[0026] The bistatic radar transmitting station and the receiving station are separated, and the receiving echo delay is the result of the combined effect of the distance history of the target and the transmitter and receiver, which makes the bistatic radar more prone to range migration and migration compared to the monostatic radar. Doppler frequency migration, the target echo accumulation time spans multiple distance units and Doppler units. At the same time, dual-base radars are faced with difficulties such as low cross-sectional area of ​​target signal radars and strong mobility, and cannot achieve effective target detection and parameter estimation. In view of this situation, the present invention has carried out research and proposed a low-cost, three-dimensional model of dual-base radar, which can improve the echo signal-to-noise ratio and higher precision of a three-dimensional space dual / multistatic radar high-speed target detection The method is the j...

Example Embodiment

[0036] Example 2

[0037] The high-speed target detection method of the three-dimensional bistatic / multistatic radar is the same as that in the first embodiment. In step (4), the generalized second-order Keystone transform is used to correct the range migration of the target echo signal, which specifically includes:

[0038] 4a) In a three-dimensional space, a moving transmitter station transmits a chirp signal. After reaching a high-speed, highly maneuverable 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 ) Dual-base radar transmitter station, the flight speed vector of the transmitter 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 speed vector is The flight acceleration vector is After reflection of the target P, it reaches the receiving station of the bistatic radar; the in...

Example Embodiment

[0056] Example 3

[0057] The high-speed target detection method of the three-dimensional bistatic / multistatic radar is the same as that of the embodiment 1-2. In the step (5) of the present invention, the distance migration signal S is eliminated 3 (f, t a ) Perform inverse Fourier transform along the fast time dimension to extract the data S(t a ), including the following steps:

[0058] 5a) Extract the signal S that has eliminated the distance migration 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) Extraction of echo data in the distance unit where the target is located: The number of distance units in the time domain of the signal without distance migration is constant, and the signal data at the distance unit is:

[0062]

[0063] Where σ 1 Is the signal amplitude, To take the cal...

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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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