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Amplitude-weighted nonlinear frequency modulation waveform design method

A non-linear frequency modulation and waveform design technology, applied in radio wave measurement systems, instruments, etc., can solve the problem that the sidelobe level cannot reach the theoretical value of the window function.

Active Publication Date: 2018-05-08
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

This method assumes that the time-domain envelope of the NLFM waveform is rectangular, and the Fresnel fluctuation of its spectrum will cause the sidelobe level to fail to reach the theoretical value of the window function

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  • Amplitude-weighted nonlinear frequency modulation waveform design method
  • Amplitude-weighted nonlinear frequency modulation waveform design method
  • Amplitude-weighted nonlinear frequency modulation waveform design method

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Embodiment Construction

[0038] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0039] This embodiment provides an amplitude-weighted non-linear frequency modulation NLFM waveform design method:

[0040] S1. Input the basic parameters of the NLFM waveform to be designed, including: pulse width T, bandwidth B, time domain amplitude and spectrum amplitude of the NLFM waveform to be designed:

[0041] Among them, in this embodiment, the pulse width T is 160 μs, and the bandwidth B is 1 MHz. In other embodiments, the pulse width and bandwidth can also be set according to actual needs, and there is no limi...

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Abstract

The invention discloses an amplitude-weighted nonlinear frequency modulation (NLFM) waveform design method. The method is characterized by firstly, inputting a pulse width, a bandwidth and time domainamplitude and frequency spectrum amplitude forms of an NLFM waveform to be designed; then, determining sampling positions in a time domain and a frequency domain and corresponding time domain amplitude and frequency spectrum amplitude sampling values during a design and calculation process; and then, based on a relation of the time domain amplitude, the frequency spectrum amplitude and a time frequency curve derivative, through loop iteration, acquiring a time frequency curve of the NLFM waveform; and finally, carrying out numerical integration on the time frequency curve to acquire a phase of the NLFM waveform, and completing an NLFM waveform design. In the invention, through carrying out amplitude weighting on a rectangle envelope of the NLFM waveform, an envelope edge becomes smooth sothat purposes of decreasing a frequency spectrum Fresnel fluctuation and reducing a sidelobe level are reached; compared with a traditional window function design method, the designed NLFM waveform can acquire a lower pulse pressure sidelobe level without complicated processes of parameter adjusting and a test; and the method possesses an actual application value.

Description

technical field [0001] The invention belongs to the field of radar waveform design, in particular to an amplitude-weighted non-linear frequency modulation waveform design method. Background technique [0002] In the radar system, due to the limited peak power of the transmitter, it is often necessary to transmit a frequency-modulated wide pulse waveform. By increasing the average transmission power, the detection power of the radar is improved; at the same time, pulse compression is performed on the received echo to ensure that the radar has Higher distance resolution. A nonlinear frequency modulation (Nonlinear Frequency Modulation, NLFM) waveform is a commonly used frequency modulation wide pulse waveform. The NLFM waveform can suppress sidelobes without loss of signal-to-noise ratio caused by weighting mismatch. [0003] NLFM waveform design is a relatively complicated process, and the classic method commonly used at present is the design method based on window function....

Claims

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Application Information

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IPC IPC(8): G01S7/28
CPCG01S7/2813
Inventor 李英贺魏艳强
Owner BEIJING INST OF RADIO MEASUREMENT
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