Realization method of solving distance ambiguity for analog TV exogenous radar based on spectrum synthesis

Abstract

The invention belongs to radar technologies, and discloses an implementation method for range ambiguity resolution of an analog television set exogenous radar on the basis of frequency spectrum synthesis. The implementation method comprises the following steps that an exogenous radar system based on an analog television set is built; clutter in video echo signals and clutter in audio echo signals are eliminated through a clutter cancellation algorithm, so that video residue echo signals and audio residue echo signals processed through cancellation are obtained; filtering operation, digital down conversion and frequency synthesis are carried out on video direct wave signals and audio direct wave signals, so that a frequency spectrum synthesis direct wave signal is obtained; filtering operation, digital down conversion and frequency synthesis are carried out on the video residue echo signals and the audio residue echo signals, so that a frequency spectrum synthesis residue echo signal is obtained; the filtering weight of the frequency spectrum synthesis direct wave signal is calculated in a sectional mode; Doppler range ambiguity resolution processing is carried out through N paths of frequency spectrum echo signals and the total filtering weight of the frequency spectrum synthesis direct wave signal.

Description

technical field [0001] The invention belongs to the technical field of radar, and specifically relates to a method for realizing distance ambiguity resolution of analog TV external source radar based on spectrum synthesis, which can be used in external source radar systems using analog TV signals as opportunistic illumination sources to realize distance ambiguity resolution. Accurately measure the distance to the target. technical background [0002] The analog TV signal is widely used in external source radar because of its high transmission power. The main components of the analog TV signal are video signal and audio signal (in the analog TV signal, the transmission power ratio of the video signal to the audio signal is 10:1), due to the high The correlation, so the analog TV signal can be seen as a signal with a period of 64 microseconds. If it is processed according to the matched filtering method, there will be a high fuzzy range side lobe at the bistatic distance of ...

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Problems solved by technology

[0003] The article "Mismatched filter for analogue TV-based passive bistatic radar" by Wang Haitao, Xidian University, IETRadarSonarNavig., 2011, Vol.5, lss.5, pp.573-581 gives the method of solving distance ambiguity in the external source radar with analog TV signal as the source of opportunity illumination. The processing method, but this method only considers the deblurring processing of the video signal in the analog TV, which causes a large loss of signal-to-noise ratio and cannot detect long-distance targets

If this method is directly applied to the implementation of external radiation source radar engineering, the following three problems will arise: First, this method only defuzzifies the video signal, and does not perform spectrum synthesis on the analog TV signal before deambiguation of distance deal with

Secondly, this method does not have a specific engineering implementation method for solving distance fuzzy processing

Thirdly, this method is based on a single echo, and cannot complete the processing of radar echoes from multiple external radiation sources with a low amount of computation.

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