Short-distance target detection radar based on stepped frequency signals

A frequency stepping, close-range technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Imaging effects, increased sensitivity, easy-to-handle effects

Inactive Publication Date: 2017-12-26
BEIHANG UNIV
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Problems solved by technology

The general continuous wave system radar adopts linear frequency modulation continuous wave, and calculates the distance of the target by comparing the frequency of the received signal with the frequency of the transmitted signal at the same time. When there are echo signals from multiple targets at different distances, the received signal is The superposition of multiple different frequency signals makes signal processing difficult and affects the accuracy of close-range detection

Method used

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  • Short-distance target detection radar based on stepped frequency signals
  • Short-distance target detection radar based on stepped frequency signals
  • Short-distance target detection radar based on stepped frequency signals

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Embodiment Construction

[0030] Such as figure 1 As shown, the antenna adopts the method of sending and receiving separately, one antenna is used to send the detection signal, and the other antenna is used to receive the scattered echo signal of the target. The antenna is a wideband shaped beam antenna with a beam width of 2 degrees in azimuth and a cosecant square form of elevation beam. During implementation, the antenna rotates periodically in the azimuth direction at a rotation speed of 10 revolutions per minute to achieve scanning in all azimuths, with a fixed pitch angle, and the shaped beam can ensure the detection of targets at different heights.

[0031] The detection signal sent each time is a single-frequency continuous wave. The frequency stepping method is used to send the detection signal, such as figure 2 shown. The number of times the probe signal is transmitted is the frequency number of the probe signal N=B / Δf, where B is the frequency bandwidth, and Δf is the frequency step size...

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Abstract

The invention relates to a short-distance target radar detection method based on stepped frequency signals. Antennas adopt a bistatic mode, one antenna is used for transmitting detection signals, another antenna is used for receiving target scattering echo signals, the detection signals transmitted every time are single-frequency continuous waves, the detection signals are transmitted in a stepped frequency mode, the times of transmitting the detection signals are the frequency number of the detection signals N=B/delta f, wherein B refers to frequency bandwidth, and delta f refers to the step length of the frequency. Corresponding to the detection signals with N frequencies, the received target scattering echo signals are si, i=0, 1,..., N-1, the target scattering echo signals are subjected to inverse Fourier transform, and one-dimensional imaging of a detection target is realized according to the propagation speed of electromagnetic waves.

Description

technical field [0001] The invention relates to a radar detection method for short-distance targets based on frequency stepping signals. Background technique [0002] Radar technology has developed rapidly since the 1930s. At present, a variety of radar systems have emerged, which are suitable for different types of target detection. In order to increase the detection distance, most radars adopt a pulse system, which concentrates the energy in one pulse and emits it to form extremely high pulse power. However, due to the common antenna for transmitting and receiving pulse radar signals, it is impossible to detect short-range targets, and the shortest distance that can be detected is limited by the pulse width and the conversion time of transmitting and receiving. [0003] In the prior art, the continuous wave system radar transmits and receives signals simultaneously, which can realize the detection of short-distance targets. The general continuous wave system radar adopts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S13/89G01S7/41
Inventor 姬金祖姜家新束长勇黄沛霖
Owner BEIHANG UNIV
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