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A Quadratic Fitting Method of Doppler Parameters Based on Time Division Multiplexing

A quadratic fitting and time division multiplexing technology, applied in the field of signal processing, can solve problems such as large hardware resources

Inactive Publication Date: 2015-08-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0015] The purpose of the present invention is in order to overcome the defective of prior art, in order to solve the problem of large hardware resource, provide a kind of Doppler parameter secondary fitting method based on time division multiplexing

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  • A Quadratic Fitting Method of Doppler Parameters Based on Time Division Multiplexing
  • A Quadratic Fitting Method of Doppler Parameters Based on Time Division Multiplexing
  • A Quadratic Fitting Method of Doppler Parameters Based on Time Division Multiplexing

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[0062] Based on the method of the present invention, a hardware emulation platform is set up, and this Doppler parameter secondary fitting method based on time division multiplexing is realized, and the Doppler parameter secondary fitting has utilized 5 multipliers, 3 dividers and 6 adders.

[0063] Set an enabling signal for Doppler parameter estimation. When the enabling signal is low, only variables related to the abscissa are processed, which can be processed in parallel with the data DC removal and range pulse compression modules. When the enabling signal of the Doppler parameter estimation is high, all computing units can be multiplexed. This not only saves computing time, but also greatly reduces the hardware resources used.

[0064] In order to verify the effectiveness of the present invention, a traditional fitting method is implemented on the same platform, and 16 single-precision floating-point data are input for a secondary fitting test. The relative error betwee...

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Abstract

A Doppler parameter quadratic fitting method based on time division multiplexing comprises the steps of (101) establishing a quadratic fitting unit which comprise a multiplying unit a2, a multiplying unit b2, a multiplying unit c2, a multiplying unit d2, a multiplying unit e2, a divider a2, a summator a2, a mean value module a2, a mean value module b2 and a mean value module c2; (102) calculating fitting parameters m, m21, m22, m23, m24 and m25 by means of the quadratic fitting unit with the abscissa xi of a scatter signal as the input end; (103) calculating the fitting coefficient summation by means of the quadratic fitting unit based on the fitting parameters m, m21, m22, m23, m24 and m25; (104) achieving quadratic curve fitting of the scatter signal based on the fitting coefficient summation. Compared with traditional quadratic fitting, the Doppler parameter quadratic fitting method based on time division multiplexing has the advantage that the number of hardware resources needed is reduced greatly by means of time division multiplexing of hardware resources in the quadratic fitting unit.

Description

technical field [0001] The invention belongs to the field of signal processing and relates to a second fitting method of Doppler parameters based on time division multiplexing. Background technique [0002] In synthetic aperture radar (SAR) imaging, the reference function for azimuth processing is determined by Doppler parameters, including Doppler center frequency and Doppler frequency modulation slope, the error of these two parameters will lead to Range migration correction errors and azimuth filtering mismatch affect the quality of SAR images. Specifically, the Doppler center frequency error will lead to a decrease in the image signal-to-noise ratio (SNR), an increase in the azimuth ambiguity signal ratio (AASR), and an error in image positioning; the estimation error of the Doppler modulation frequency will cause the impulse response to broaden, making the The image is defocused, and the resolution is reduced, and the peak gain is also reduced. [0003] The Doppler pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/28
CPCG01S7/295G01S13/90G01S13/9004
Inventor 陈禾闫雯于文月谢宜壮曾涛龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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