Measuring method of bi-static forward-looking and squinting synthetic aperture radar Doppler center frequency

A technology of synthetic aperture radar and Doppler center, applied in radio wave measurement systems, instruments, etc., can solve the problems of low efficiency, shorten processing time, long processing time, etc., achieve high efficiency, save processing time, and short processing time Effect

Active Publication Date: 2011-01-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to aim at the defective that background technology exists, research and design a kind of measurement method of bistatic forward-looking, squint synthetic aperture radar Doppler center frequency, to overcome conventional Doppler center frequency measurement method can not be used in bistatic front Look and squint SAR, as well as long processing time and low efficiency; to simplify the measurement of the Doppler center frequency of bistatic forward-looking and squint synthetic aperture radar (SAR), shorten the processing time, and effectively improve the efficiency of the measurement and real-time measurement reliability, and to provide accurate and reliable data for subsequent high-precision imaging and motion compensation

Method used

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  • Measuring method of bi-static forward-looking and squinting synthetic aperture radar Doppler center frequency
  • Measuring method of bi-static forward-looking and squinting synthetic aperture radar Doppler center frequency
  • Measuring method of bi-static forward-looking and squinting synthetic aperture radar Doppler center frequency

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Embodiment Construction

[0025] figure 2 It is a schematic diagram of the geometric configuration of the bistatic forward-looking SAR in this embodiment,

[0026] The transmitter is fixed, and the radar transmitter transmits a linear frequency modulation signal with a signal wavelength of λ=0.03125m, and the frequency modulation slope is K r =8×10 12 Hz / s; the speed of the receiver is v=100m / s, the speed error in the simulation of this embodiment is set to +0.5m / s, and the downward viewing angle is After coherent demodulation, the bistatic forward-looking SAR point target echo signal is expressed as:

[0027] S ( t , π ) = exp { - j 2 π λ R ( t ) } · exp { jπ K r [ τ...

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Abstract

The invention belongs to a measuring method of synthetic aperture radar (SAR) non-fuzzy Doppler center frequency, comprising: compressing range direction pulse; obtaining initial slope; converting a frequency domain and a time domain; obtaining the waveform entropy of a sequence; determining the minimum waveform entropy; and determining the non-fuzzy Doppler center frequency. The invention utilizes the geometrical characteristics of the synthetic aperture radar echo on range time and azimuth time domains and the self information of a mobile platform to repeatedly correct range ambulating trajectory so as to determine the minimum entropy, thus measuring whether the trajectory is well corrected or not; the slop ratio of the corresponding trajectory to the wavelength of an emitted signal is used for obtaining the non-fuzzy Doppler center frequency; and the measured frequency is improved by more than 5 times compared with Laden conversion. Thus, on the aspect of bi-static forward-looking and squinting synthetic aperture radar (SAR) Doppler center frequency, the invention has the characteristics of simple and accurate measurement, short processing time, high efficiency, strong instantaneity and capability of providing accurate and reliable data for subsequent high-precision imaging and motion compensation.

Description

technical field [0001] The invention belongs to a method for measuring parameters of synthetic aperture radar (SAR), in particular to a method for measuring the unambiguous Doppler center frequency of bistatic forward-looking and squint SAR. Determination of the Puler center frequency. Background technique [0002] Compared with optical sensors, Synthetic Aperture Radar (SAR) has the unique advantages of strong penetrability and ability to work around the clock. It has been widely used in the fields of earth remote sensing, resource exploration, reconnaissance, surveying and mapping, and disaster forecasting. Compared with conventional side-looking SAR, forward-looking and squint-looking SAR has unique advantages in fighter planes' ground reconnaissance and strike, autonomous landing, material airdrop, missile precision terminal guidance, etc., and has been extensively studied at present. [0003] The Doppler center frequency is an important parameter required for high-prec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
Inventor 李文超杨建宇黄钰林武俊杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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