Two-grade digital channelization receiving device of passive radar

Abstract

The invention provides the two-grade digital channelization receiving device of a passive radar. The device comprises a one-grade digital channelization receiving module, a one-grade effective channelselection module, a two-grade digital channelization receiving module and a two-grade effective channel selection module. After two-grade digital channelization receiving and selection, the amplitudeand the phase value of a signal in an effective channel are acquired. The device is suitable for most passive radar signal processing systems. For different sampling rates and frequency band width requirements, a design module with flexible and selectable parameters is packaged, the modularization and the generalization of a design are realized and a design period can be greatly shortened. The requirements of a passive conformal antenna radar to signal detection sensitivity and a signal to noise ratio are satisfied. Through two-grade channelization processing, the sensitivity and the signal to noise ratio are effectively increased. After two-grade channelization combination processing, a signal to noise ratio gain is about 17dB. Through adopting two-grade digital channelization receiving,operation resources are reduced and chip power consumption is decreased.

Description

technical field [0001] The invention belongs to the technical field of radar, and in particular relates to a two-stage digital channelization receiving device for passive radar. Background technique [0002] Today's radar has developed from a single active mode to multi-mode. Whether it is pure passive radar or the increasingly popular active-passive composite radar, passive radar plays an increasingly important role in the radar family. The passive radar antenna has also developed from the original planar dual-polarization antenna to the conformal antenna. [0003] For the field of passive radar signal processing, the processed signal bandwidth is getting wider and higher, and the sampling rate is getting higher and higher, which has been increased from tens of MHz to several GHz; The intensity gap is large, and the requirements for signal detection sensitivity are getting higher and higher. As a key technology of passive radar signal processing, the requirements for chan...

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Problems solved by technology

[0004] The digital channelized reception of radar signals needs to improve the signal-to-noise ratio by channelizing the sampling signal. The more channels there are, the higher the signal-to-noise ratio gain will be. The problem of low processing speed, therefore, it is increasingly difficult for single-stage digital channelized reception to meet the requirements of signal processing

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