Multi-carrier-based leaky cable intrusion detector capable of achieving precise positioning

Abstract

The invention provides a multi-carrier-based leaky cable intrusion detector capable of achieving precise positioning.The detector comprises an embedded leaky cable, a digital emitter, a digital receiver, a multi-channel baseband code generator, a multi-carrier modulation-demodulation processing module, a multi-carrier intrusion detection and positioning treatment module, an upper computer interface and a power module, wherein the multi-channel baseband code generator is used for generating multi-channel code signals in real time, the multi-carrier modulation-demodulation processing module is used for modulating multi-carrier coded modulation signals of a transmitting chain in real time and demodulating multi-carrier coded modulation signals of a receiving chain in real time, and the multi-carrier intrusion detection and positioning treatment module is used for high-sensitivity intrusion detection and precise positioning.Phase position ambiguity resolution during super-resolution positioning is achieved through multi-carrier combined judgment, and the reliability of super-resolution precise positioning can be improved effectively; furthermore, intrusion target detection sensitivity can be effectively improved through multi-carrier diversity gain, and the detector can support longer cables.

Description

technical field [0001] The invention relates to the technical field of positionable microwave intrusion detection, in particular to a multi-carrier-based leaky cable intrusion detector capable of precise positioning. Background technique [0002] Leakage cable intrusion detector system is a microwave-based outdoor perimeter intrusion detection equipment. It is installed shallowly underground and has the characteristics of all-weather, all-time, high concealment and high reliability. It can be widely used in banks, airports, and villas. , smart communities, government agencies, public security prisons, military targets and other important building perimeters, providing security and alarm functions. [0003] Searched: [0004] Patent application number CN03209915.0, titled: perimeter intrusion prevention system based on radio electromagnetic field principle; patent application number CN200620023420.2, titled: leakage cable intrusion detector; patent application number CN20092...

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Problems solved by technology

[0004] Patent application number CN03209915.0, titled: perimeter intrusion prevention system based on radio electromagnetic field principle; patent application number CN200620023420.2, titled: leakage cable intrusion detector; patent application number CN200920266688.2, title: leaky cable perimeter Intrusion detector; patent application number CN200910050473.1, named: a leaky cable intrusion detector system; patent application number CN201420527941.6, named: a leaky cable intrusion detector with local storage of alarm records; patent application number CN201420527914.9, named: a leaky cable intrusion detector with improved phase stability; patent application number CN201420527856.X, named: a leaky cable intrusion detector that can identify electrical pulse interference; patent application number CN201420527913.4 , titled: a low false alarm rate leakage cable intrusion detector with a narrowband frequency conversion receiving system; the above-mentioned patent documents have announced several different designs of leakage cable intrusion detection equipment, all of which use a single-frequency signal system, although they have been carried out to different degrees. improvement, but the anti-interference ability is weak, and they do not have the positioning function, and the partition sensitivity cannot be set. The cable length supported by a single host is severely limited.

[0005] Patent application number CN200620020592.4, titled: Single-machine multi-domain positioning perimeter intrusion detection and alarm system, announced a leaky cable intrusion detector with multiple transmission sections using a frequency division multiplexing system, with section-level Positioning capability, but each section must be equipped with a separate transmitter, the section division should not be too fine, and the positioning accuracy is low; and the transmission signal of each section is still a single-frequency signal system, and the anti-interference ability is still weak

[0006] Patent application number CN200720102655.5, titled: Positioning Leaky Cable Intrusion Detector, announced a leaky cable intrusion detector that adopts the radar coding positioning principle, adopts a broadband phase coding signal system, not only has high positioning accuracy, but also Has strong anti-interference ability, but does not have super-resolution ability

[0007] The paper "Experience with Ranging Buried Cable Sensing" (IEEE International Carnahan Conference on Security Technology, pp.193-200, 2007) announced a high-precision location leaking cable intrusion detector, which uses a single-carrier Golay two-phase encoding signal system, performs rough positioning through digital correlation, and then uses phase This system has high positioning accuracy and strong anti-interference ability, but there will be a certain probability of phase ambiguity, so that the reliability of precise positioning is not high

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