Implementation method for range ambiguity resolution of analog television set exogenous radar on basis of frequency spectrum synthesis

A technology for solving distance ambiguity and analog TV, which is applied in the field of radar, and can solve problems such as the inability to resolve distance ambiguity of analog TV signals, and the inability to detect long-distance targets

Active Publication Date: 2014-06-25
XIDIAN UNIV
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Problems solved by technology

[0003] The article "Mismatched filter for analogue TV-based passive bistatic radar" written by Wang Haitao of Xidian University, IET Radar Sonar Navig., 2011, Vol.5, lss.5, pp.573-581 gives an opportunity to illuminate the analog TV signal However, this method only considers the defuzzification 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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  • Implementation method for range ambiguity resolution of analog television set exogenous radar on basis of frequency spectrum synthesis
  • Implementation method for range ambiguity resolution of analog television set exogenous radar on basis of frequency spectrum synthesis
  • Implementation method for range ambiguity resolution of analog television set exogenous radar on basis of frequency spectrum synthesis

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Embodiment Construction

[0047] refer to figure 1 , illustrate the method for implementing the distance ambiguity solution of the analog TV external source radar based on spectrum synthesis of the present invention, and its specific implementation steps are as follows:

[0048] Step 1, refer to figure 2 , build an external source radar system based on analog TV, its reference antenna obtains the digitally collected external video direct wave signal V of analog TV r and audio direct wave signal A r , its echo antenna acquires N-way video echoes V of digitally collected external sources of analog TV 1 ,V 2 ,...,V N and N audio echo A 1 ,A 2 ,...,A N .

[0049] The number of echo paths N is determined by the specific radar system.

[0050] Step 2, using the clutter cancellation algorithm to respectively eliminate clutter in the video echo signal and the audio echo signal, and obtain the canceled video residual echo signal and audio residual echo signal.

[0051] 2a) The video direct wave signa...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/08G06F19/00
CPCG01S7/02G01S13/08G16Z99/00
Inventor 王俊吕小永刘杰
Owner XIDIAN UNIV
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