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Pulse Doppler radar echo signal preprocessor with line reinforcer

A radar signal and enhancer technology, applied in the field of pulse Doppler radar signal processing, can solve the problems of low Doppler spectral line energy, low Doppler signal signal/noise, etc., achieve good compatibility and improve survivability , the effect of improving performance

Inactive Publication Date: 2011-09-14
张丽 +1
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Problems solved by technology

[0007] (2) The spectral line of the isolated target may fall into the clutter-free area, so it will be analyzed and detected by the narrow-band Doppler filter bank
Existing SSB line filters, and additional image 3 The pulse Doppler radar analog processors shown can only extract signals related to both sides of the main spectral line for Doppler analysis, and the Doppler spectral line energy of the echo signal of the moving target detected by it is low, and the output Low signal / noise ratio for Doppler signals

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  • Pulse Doppler radar echo signal preprocessor with line reinforcer
  • Pulse Doppler radar echo signal preprocessor with line reinforcer
  • Pulse Doppler radar echo signal preprocessor with line reinforcer

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[0033] See attached Figure 4-3 , a pulse Doppler radar signal processor with a spectral line enhancer, including a clock generator (not shown in the figure), a range gate, an intermediate frequency bandpass filter, a coherent detector, a coherent local oscillator, a spectral Line enhancer, low-pass filter (LPT), Doppler filter (FFT) and display, the output of the range gate that receives the intermediate frequency (IF) input and the clock pulse (gate pulse) input is connected to the intermediate frequency band-pass filter (BPF) input, the output of the intermediate frequency band-pass filter is connected to the coherent detector, meanwhile, the coherent local oscillator is also connected to the coherent filter, and the spectral line enhancer is composed of a four-quadrant multiplier and a digital multivibrator wave signal generator, the output of the coherent detector is connected to the four-quadrant multiplier, the digital multi-harmonic signal generator is connected to the...

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Abstract

The invention provides a pulse Doppler radar signal preprocessor with a spectrum enhancer, including a distance door, a medium frequency band pass filter, a coherent detector, a coherent local oscillator, the spectrum enhance, a Low Pass Filter (LPT), a Doppler filters (FFT) and a display, wherein the spectrum enhancer is composed of a four-quadrant multiplier and a correlation function generator. The invention has the advantages of: greatly improving the amplitude of the Doppler output spectrum; improving signal / noise ratio of the Doppler signal; having good compatibility; enabling various pulse Doppler radar to improve the viability of the radar in electronic countermeasure environment.

Description

technical field [0001] The invention relates to a radar signal processing technology, in particular to a pulse Doppler radar signal processing technology. Background technique [0002] The emission spectrum of pulse Doppler radar is determined by the carrier frequency f 0 and side frequency f 0 ±if R composed of several discrete spectral lines, where f R is the pulse repetition frequency, and i is an integer. The envelope formed by each spectral line is determined by the shape of the pulse. Generally, a rectangular pulse train is used, and the envelope of the frequency spectrum is in the shape of Sinx / x (where x=iπτ / T, τ is the pulse width, and T is the pulse period). [0003] The received spectrum produced by an isolated reflector has spectral lines that are Doppler shifted proportional to the radial velocity V between the radar station and the reflector. The two-way Doppler shift is f d =2V / λ, where λ is the wavelength of the radar. attached figure 1 Burst spectra...

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Application Information

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IPC IPC(8): G01S7/02G01S7/292G01S7/32G01S7/36G01S7/41G01S13/50
Inventor 张九愚陈玉英
Owner 张丽