System utilizing CMMB (China Mobile Multimedia Broadcasting) signal to detect target and method thereof

Abstract

The invention relates to a system utilizing CMMB (China mobile multimedia broadcasting) signals to detect a target and a method thereof. The system comprises a receiving antenna, an analog chassis with a signal simulating and receiving component, a CPCI (compact peripheral component interconnect) chassis with a signal acquisition and processing component, at least one disc array chassis with a signal storage component, a switchboard and a signal process for signal processing, which are connected in sequence. The analog reception adopts a scheme of secondary mixed frequency and fixed medium frequency; the data acquisition adopts a scheme of medium-frequency bandpass sampling and digital down-conversion; the data storage adopts a high-speed disc array; and the data processor is used for implementing such operations as signal reconstruction, channel correction, direct wave suppression, digital beam formation, inter-ambiguity function, peak detection, constant false alarm detection, positioning and tracking and the like, and final output of information of the target distance, speed and direction. The system has the following advantages of no need for frequency distribution, no electromagnetic pollution, high signal randomness, high signal interception performance, large signal bandwidth, high distance resolution, low research and maintenance cost, and high mobility.

Description

technical field [0001] The invention relates to the technical field of passive radar, in particular to a system and method for detecting targets by using CMMB signals. Background technique [0002] Passive radar itself does not emit electromagnetic signals, it uses target radiation or external radiation sources such as radio, television and communications to achieve target detection and tracking. Among them, the passive radar using external radiation sources adopts coherent processing technology, that is, at least two channels are set in the receiving system: monitoring channel and reference channel, which are used to receive target echo signals and reference signals respectively, and then calculate their mutual ambiguity function to get Range Doppler spectrum, so as to realize the detection and tracking of the target. [0003] The research and application of moving target detection and positioning under external radiation conditions can be traced back to the early days of ...

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Problems solved by technology

[0003] The research and application of moving target detection and positioning under external radiation conditions can be traced back to the early days of radar development. As early as 1935, the Davertry experiment conducted by Arnod Wilkins in the United Kingdom used the radiation signal of the BBC short-wave radio transmitter to detect bombers flying nearby; World War II During this period, the bistatic radar Klein Heidelberg developed and used by Germany used the British Chain Home transmitter as the irradiation source, and the receiver was installed in Denmark. It was used to locate the allied aircraft taking off from the British mainland, but its accuracy was limited.

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