Interference canceller applied to detecting core quadrupole moment resonance signal

Abstract

The invention discloses an interference canceller applied to detecting a core quadrupole moment resonance signal. The interference canceller comprises a main channel, an auxiliary channel, a space domain interference canceling treatment module between the main channel and the auxiliary channel, and a time domain interference canceling module in the main channel. A master control computer generates an exciting pulse sequence, and the exciting pulse sequence is loaded to a main antenna coil to excite a sample to be detected through a signal generator and a high-power transmitter; an NQR (nuclear quadrupole resonance) signal obtained by excitation is received in the main channel through the main antenna coil, and meanwhile, the space domain interference is received in the auxiliary channel through an auxiliary antenna coil; signals in the main channel and the auxiliary channel enter a space domain interference canceling treatment process through a preamplifier, an analog receiver, A / D (analog to digital) and signal preprocessing, and finally a processing result is transmitted to the master control computer. A double-channel explosive detection system scheme is benefit to suppressing the interference in a space domain; and moreover, a space-time adaptive processing method is firstly adopted to suppress the interference aiming at a double receiving channel explosive detection system.

Description

technical field [0001] The invention belongs to the technical field of weak signal detection, and specifically relates to an interference canceller suitable for nuclear quadrupole moment resonance signal detection. In a complex background noise environment, a dual-channel space-time self-adaptive cancellation algorithm is adopted to realize Robust Interference Suppression. Background technique [0002] Such as figure 1 Shown is the schematic block diagram of a single-channel explosives detection system based on Nuclear Quadrupole Resonance (NQR) technology. It can be seen from the figure that the NQR detection system consists of a main control computer, a signal generator, a high-power transmitter, and an antenna coil. , preamplifier, analog receiver and digital receiver. [0003] The NQR detection process mainly includes three steps. In the first step, the computer sends a pulse control sequence to the signal generator. In the second step, the signal generator generates ...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the characteristics of the nuclear quadrupole moment resonance echo signal with space and time domain interference, focusing on solving the problem of interference suppression under complex signal conditions, and proposing a detection system based on dual receiving channels. In addition, a space-time adaptive interference suppression method is also provided. Aiming at the real-time problem of algorithm realization, a system structure of interference cancellation for nuclear quadrupole moment resonance signal detection is given to realize the interference suppression based on nuclear quadrupole Polar Moment Resonance Explosive Detection Interference Suppression Problem

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