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Short-distance side-lobe frequency-modulated interrupted continuous-wave radar device

A technology of distance sidelobe and wave radar, which is applied in the radio wave measurement system, radio wave reflection/reradiation, utilization of reradiation, etc., can solve the problem of excessive radar distance sidelobe, weak target missed detection, and echo signal inaccuracy. issues of continuity

Active Publication Date: 2012-12-12
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the FMICW radar obtains good transceiver isolation, the discontinuity of its echo signal will cause the radar's range sidelobe to be too high
In practical engineering applications, the too high echo distance side lobe will make the echo signal of the weak target be submerged by the distance side lobe of the echo signal of the strong target, resulting in the missed detection of the weak target, thereby reducing the reliability of the radar. sex

Method used

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  • Short-distance side-lobe frequency-modulated interrupted continuous-wave radar device
  • Short-distance side-lobe frequency-modulated interrupted continuous-wave radar device
  • Short-distance side-lobe frequency-modulated interrupted continuous-wave radar device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Figure 4It is an implementation of the present invention. In this implementation, the output signal of the frequency sweep driver 10 is input to the radio frequency VCO 1, the output signal of the radio frequency VCO 1 is input to the directional coupler 2, one output signal of the directional coupler 2 is input to the mixer 15, and one output signal is input to the SPDS Throw type RF switch 3A. Under the control of the radio frequency switch controller 11, in a time slot, when the input end of the output terminal 3-1 and the single pole double throw type radio frequency switch 3A is conducted, the output terminal 3-2 and the single pole double throw type radio frequency switch 3A The input end of the output terminal 3-1 is disconnected, the output signal of the output terminal 3-1 is input into the circulator one 5, and the output signal of the circulator one 5 is input into the A polarized antenna 6 (in this embodiment, it is a vertically polarized antenna), and the...

Embodiment 2

[0054] Figure 5 It is another implementation of the present invention. In this implementation, the output signal of the frequency sweep driver 10 is input to the radio frequency VCO 1, the output signal of the radio frequency VCO 1 is input to the directional coupler 2, one output signal of the directional coupler 2 is input to the power divider B of the receiving part, and one output signal is input to the transmitter Part of the power divider A 3 . In a time slot, the power divider A 3 of the transmitting part evenly distributes the power of the FMCW to the single-pole-single-throw RF switch 1 4 and the SPST RF switch 2 7 . Under the control of the radio frequency switch controller 11, in a time slot, when the radio frequency switch one 4 was conducting, the radio frequency switch two 7 was disconnected, and the output signal of the radio frequency switch one 4 was input into the circulator one 5, and the output signal of the circulator one 5 The output signal is input to...

Embodiment 3

[0058] This embodiment is realized by combining the transmitting part of Embodiment 1, the receiving part of Embodiment 2 and the common signal processing and display parts of both.

[0059] Specifically, in this example:

[0060] The output signal of the frequency sweep driver 10 is input to the radio frequency VCO 1, the output signal of the radio frequency VCO 1 is input to the directional coupler 2, one output signal of the directional coupler 2 is input to the power divider B, and the other output signal is input to the SPDT radio frequency switch 3A . Under the control of the radio frequency switch controller 11, in a time slot, when the input end of the output terminal 3-1 and the single pole double throw type radio frequency switch 3A is conducted, the output terminal 3-2 and the single pole double throw type radio frequency switch 3A The input terminal of the output terminal 3-1 is disconnected, the output signal of the output terminal 3-1 is input into the circulato...

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Abstract

The invention discloses a low-distance side-lobe frequency-modulated interrupted continuous-wave radar device which is provided with a polarized antenna A and a polarized antenna B. The polarized antenna A and the polarized antenna B are polarized orthogonally mutually, and alternately transmit and receive two types of polarization orthogonal FMICW (frequency-modulated interrupted continuous wave) signals. In order to alternately transmit and receive the two types of polarization orthogonal signals alternately, the short-distance side-lobe frequency-modulated interrupted continuous-wave radar device is additionally provided with a power divider A3 and a synthesizer 14, and the structure of a radiofrequency switch device A, the structure of a radiofrequency switch device B and a corresponding radiofrequency switch controller are modified. The short-distance side-lobe frequency-modulated interrupted continuous-wave radar device capable of realizing short-distance side lobe is characterized in that the polarization orthogonal FMICW signals are alternately transmitted and received. Accordingly, the quantity of sampled synthesized echo signals is doubled, the minimum sampling interval is halved, side lobe of a processed distance spectrum is effectively reduced, and capability of detecting weak targets and strong targets simultaneously is improved.

Description

technical field [0001] The invention relates to the technical field of frequency modulation interrupted continuous wave radar, in particular to a frequency modulation interrupted continuous wave radar with low distance side lobe. [0002] Background technique [0003] Frequency modulated continuous wave (FMCW) radar has the advantages of low intercept probability, high distance resolution, low transmitter power, high receiver sensitivity, simple structure and low cost, and has been widely used. However, FMCW radar has the problem of leakage of transmitted signal power. The leaked power reduces the sensitivity of the radar receiver, saturates the receiver, and even burns the receiver. For this reason, the leakage problem seriously limits the application of FMCW radar in practical engineering. One of the effective methods to solve the isolation problem of FMCW radar transceiver signal is to adopt the method of time division, that is, on the basis of the FMCW radar transceiv...

Claims

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Application Information

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IPC IPC(8): G01S13/02G01S7/35
Inventor 陈祝明曾海涛王佰筝张也朱晓章
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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