Estimation method for motion parameter of stepped frequency radar target

A frequency stepping radar and motion parameter technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of affecting the speed estimation accuracy, complex transmitting end, and large speed estimation error

Active Publication Date: 2019-11-12
NANJING COLLEGE OF INFORMATION TECH
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Problems solved by technology

[0003] At present, the commonly used frequency stepping radar signal target motion detection methods mainly include the following categories: The first type of method is to use the coherent detection method to estimate the target’s motion speed first, and then perform motion compensation on the echo signal, but this method is difficult to obtain in the signal-to-noise The speed e...

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  • Estimation method for motion parameter of stepped frequency radar target
  • Estimation method for motion parameter of stepped frequency radar target
  • Estimation method for motion parameter of stepped frequency radar target

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[0033] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0034] like Figure 1 to Figure 4 As shown, a frequency stepping radar target motion parameter estimation method includes the following steps:

[0035] Step 1. Mix the target echo signal to remove the carrier;

[0036] Let the repetition period of the frequency stepping radar transmit signal be T, the sub-pulse width be τ, and the initial carrier frequency be f 0 , the frequency step is Δf, the number of sub-pulses in the pulse group is I, the electric wave transmission speed is c, the target movement speed is v, and the time variable is t, then the transmitted signal of the step frequency radar can be expressed as:

[0037]

[0038] Among them: j is the imaginary number symbol, f i = f 0 +iΔf, set the initial radial distance from the targe...

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Abstract

The invention discloses an estimation method for a motion parameter of a stepped frequency radar target, and belongs to the field of radar signal processing. The stepped frequency radar signal is verysensitive to the target motion, therefore the motion speed of the target needs to be accurately estimated before a high resolution range profile is synthesized. The method comprises the steps of firstly, analyzing radar echo signal characteristics of a uniform-speed motion target, and eliminating a secondary phase term of the echo through Keystone transform; and secondly, performing IFFT (InverseFast Fourier Transform) operation on a group of stepped frequency echo signals and then performing FFT (Fast Fourier Transform Algorithm) operation to obtain a two-dimensional distance-speed parameter spectrum, and obtaining accurate estimation values of the target speed and the initial distance according to the peak position. However, when noise interference exists, the target parameter estimation is not accurate, therefore, the distance dimension parameter spectrum is denoised by using a maximum likelihood estimation threshold-based Morlet wavelet denoising method so as to obtain the accurate parameter estimation of the target in low signal to noise ratio. The estimation method for the motion parameter of the stepped frequency radar target disclosed by the invention has popularization and application values in the field of stepped frequency radar signal processing.

Description

technical field [0001] The invention belongs to the field of frequency step radar signal processing engineering, and in particular relates to a method for estimating motion parameters of a frequency step radar target. Background technique: [0002] The frequency step signal is a kind of synthesized wideband radar signal, which has become a hot spot in the research of radar signal processing in recent years. However, since the frequency step signal is a Doppler sensitive signal, the movement of the target will cause problems such as inaccurate ranging, waveform divergence, and amplitude loss. Therefore, how to perform velocity estimation and motion compensation becomes the key to high-resolution range imaging of moving targets in frequency stepping radar. [0003] At present, the commonly used frequency stepping radar signal target motion detection methods mainly include the following categories: The first type of method is to use the coherent detection method to estimate th...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41Y02A90/10
Inventor 罗文茂顾艳华陈雪娇姜敏敏闫之烨
Owner NANJING COLLEGE OF INFORMATION TECH
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