Distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals

A technology of frequency hopping signals and processing methods, applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., can solve problems such as limited application, limited sidelobe suppression performance, grid mismatch, etc., and achieve reduction Effect of cycle time, unambiguous speed range increase, amount reduction

Active Publication Date: 2017-12-29
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

However, these methods have their inherent disadvantages, such as limited sidelobe suppression performance, grid mismatch, etc., which also limit the application of these methods in 2D processing

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  • Distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals
  • Distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals
  • Distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals

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Embodiment Construction

[0070] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0071] Such as figure 1 As shown, the distance and speed two-dimensional high-resolution processing method of a sparse frequency hopping signal of the present invention includes the following processes:

[0072] Step 1: Randomly extract frequency hopping codes from the frequency set to form a transmission waveform of sparse frequency hopping signals.

[0073] Assuming that a waveform cycle of a sparse frequency hopping signal consists of H pulses, the step of each pulse is randomly selected from the frequency set {0,Δf,...,(N-1)Δf} (N>H), that is, the hth (h=0,1,…,H-1) pulse frequency is F h =f c + f h , where f c is the carrier frequency, f h =c h Δf,c h ∈{0,1,...,(N-1)} is frequency hopping code. And the sparse frequency hopping codes of each waveform cycle are the same.

[0074] Sampling is performed...

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Abstract

The invention discloses a distance and velocity two-dimensional high-resolution processing method of sparse frequency hopping signals. The method comprises the following the steps that: frequency hopping codes are randomly extracted from a frequency set so as to form the transmission waveforms of the sparse frequency hopping signals; initial velocity compensation is performed on echo sampling baseband signals; velocity dimension alignment is performed; cross term compensation is performed; distance-dimension iteration interpolation sidelobe suppression high-resolution processing is performed; velocity-dimension inverse Fourier transform processing is performed; and Doppler iterative interpolation high-resolution processing is performed. With the method of the invention adopted, a distance sidelobe suppression problem due to random frequency hopping or spectrum discontinuity in radar signal distance and velocity two-dimensional processing can be solved, and velocity resolution can be improved.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a two-dimensional high-resolution processing method for distance and velocity of sparse frequency hopping signals. Background technique [0002] The classic waveform forms of synthetic broadband technology, such as step frequency pulse signal or Costas coded signal, have problems such as speed ambiguity at high relative speeds. In the long distance, in order to increase the energy of the echo signal, the pulse width of the transmitted signal needs to be wide and the pulse interval between sub-pulses should be long. At this time, the step frequency interval of the signal is low, and the speed processing performed by sampling at the same frequency point is seriously blurred. , and does not meet the high data rate requirements. [0003] Sparse frequency hopping signal not only has the advantages of frequency step signal, but also has an ideal "thumbtack" fuzzy funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/42G01S13/58
CPCG01S13/422G01S13/58
Inventor 刘俊豪陈潜王海涛高亮黄啸
Owner SHANGHAI RADIO EQUIP RES INST
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