Improved algorithm based on parameter estimation and compensation of quadratic phase function

A secondary phase and parameter estimation technology, applied in radio wave reflection/re-radiation, using re-radiation, measurement devices, etc., can solve problems such as Doppler spread, target echo across distance units, etc.

Active Publication Date: 2018-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, during the long-term accumulation process, the target echo may move across the distance unit and Doppler spread phenomenon

Method used

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  • Improved algorithm based on parameter estimation and compensation of quadratic phase function
  • Improved algorithm based on parameter estimation and compensation of quadratic phase function
  • Improved algorithm based on parameter estimation and compensation of quadratic phase function

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Embodiment

[0126] 1) The simulation parameters are as follows:

[0127] In the simulation experiment, the coordinates of the bistatic radar transmitting station are (-60km,0,0), the coordinates of the bistatic radar receiving station are (60km,0,0), and the carrier frequency of the bistatic radar signal is f c =4GHz, the transmit signal bandwidth is B=4MHz, the signal sampling frequency f of the bistatic radar receiver s =8MHz, speed of light c=3×10 8 m / s, the pulse width T of the chirp signal transmitted by the bistatic radar p =20us, the pulse repetition frequency of the pulse signal transmitted by the bistatic radar is PRF=500Hz, and the number of pulses transmitted by the radar is N=256. The noise received by the radar is Gaussian white noise, the initial coordinates of the target are (-40km, 0, 100km), the azimuth angle of the target speed is π / 3, and the pitch angle of the target speed is 2π / 5.

[0128] 2) Simulation content

[0129] Simulation experiment 1: When the signal-to-...

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Abstract

The invention discloses an improved algorithm based on parameter estimation and compensation of a quadratic phase function, and belongs to the technical field of signal and information processing. Thealgorithm performs range walk correction on slow time-range frequency domain echo signal considering range walk and Doppler diffusion through Keystone transform, and then eliminates a coupling relation between the range frequency f and the slow time tn in a second-order phase item corresponding to the acceleration in a narrow-band condition; meanwhile, a folding factor corresponding to the blindspeed is searched, a folding factor compensation item is constructed to correct the range walk caused by the blind speed; then the target acceleration is estimated by using the quadratic phase function, and a second-order phase item corresponding to the acceleration is constructed to compensate Doppler diffusion of the echo signal; and finally, long-term phase-coherent accumulation is performed soas to realize high-speed weak target detection of bistatic radar. The method disclosed by the invention is high in operation speed, stable in performance and applicable to detection of weak targets with a low signal-to-noise ratio and difficultly estimated target parameters.

Description

technical field [0001] The invention belongs to the technical field of signal and information processing and is applied to long-term coherent accumulation detection of radar targets. Specifically, it relates to a method for correcting target echo distance walking and compensating for Doppler spread by using Keystone transformation and a quadratic phase function (Square Phase Function) in a bistatic radar system. Background technique [0002] With the vigorous development of today's science and technology, the stealth technology and maneuverability of aircraft have been greatly improved, the performance of anti-radiation missiles has been improved, and electronic interference has intensified. These complex environments and low-detectable targets with high-speed maneuvering are difficult for conventional radars. The survival and combat capability of the system pose a severe test, and the dual (multi-base) radar has the ability to fight against these threats because its transmi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S7/41G01S13/00G01S13/58
CPCG01S7/40G01S7/415G01S13/003G01S13/584
Inventor 曹建蜀刘雪阳张翼
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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