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Pulse detection method and system

A technology of pulse detection and detection threshold, which is applied in the field of signal detection, can solve problems such as high estimation cost, signal distortion, and difficult implementation, and achieve the effects of reducing false alarm probability, increasing detection probability, and improving environmental adaptability and reliability

Active Publication Date: 2012-08-22
TSINGHUA UNIV
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Problems solved by technology

The fixed-threshold pulse detection method is only for the presence of noise, and the presence of continuous wave interference will lead to a decrease in detection performance or even failure to detect; the notch filter method is only suitable for dealing with narrow-band interference, and for broadband interference and interference with unknown or changing frequencies. It cannot be processed, and the flexibility is

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  • Pulse detection method and system

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Embodiment Construction

[0034] The pulse detection method and system proposed by the present invention are described in detail as follows in conjunction with the accompanying drawings and embodiments.

[0035] The method of the invention first smooths and filters the pulse envelope to reduce the influence of random noise; then, through the adaptive adjustment of the detection threshold, the influence of continuous wave interference on the performance of pulse detection is reduced. Such as figure 1 As shown, a pulse detection method according to an embodiment of the present invention includes steps:

[0036] S1. Perform L-point smoothing filter processing on the envelope x(n) of the received signal to reduce the influence of random noise. The smoothing filter expression is as follows:

[0037] y ( n ) = 1 L Σ k = 0 ...

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Abstract

The invention discloses a pulse detection method and a pulse detection system and relates to the technical field of signal detection. The method comprises the following steps of: S1, performing smooth filtration on a received signal envelope; S2, calculating an envelope middle level value of a received signal which is processed in the step S1; S3, setting a detection threshold according to the envelope middle level value of the received signal and the envelope middle level value of receiver noise; and S4, detecting a pulse signal according to the detection threshold. By the method and the system, the detection threshold is set by measuring and comparing the envelope middle level value of the received signal and the envelope middle level value of the receiver noise, and adaptive factor adjustment is performed according to the strength of continuous wave interference, so that the detection threshold is adaptively adjusted, the detection probability of pulse can be effectively improved in a complex electromagnetic environment, the false alarm probability is reduced at the same time, and the environment adaptability and reliability of pulse detection can be obviously improved.

Description

technical field [0001] The invention relates to the technical field of signal detection, in particular to a pulse detection method and system. Background technique [0002] Pulse signals are widely used in communication, navigation, and radar. Correctly estimating the start time and duration of signals through pulse detection and parameter measurement is a necessary prerequisite for the analysis and processing of such signals. With the development of wireless technology, the space electromagnetic environment is becoming more and more complex, which brings great difficulties and challenges to the detection of pulse signals. Continuous wave interference signals are often mixed in the detection bandwidth of pulse signals. The traditional processing methods mainly include fixed threshold detection method, notch filter method and parameter estimation interference cancellation method. The fixed-threshold pulse detection method is only for the presence of noise, and the presence o...

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Application Information

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IPC IPC(8): G01R29/02
Inventor 黄振陆建华肖心龙郭智炜李振强郭汉伟
Owner TSINGHUA UNIV
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