Signal processing method for resisting inter-pulse false target of frequency agile radar

Abstract

According to the signal processing method for resisting the inter-pulse false target of the frequency agility radar, accumulation of an inter-pulse frequency agility radar system is achieved, interference signals can be effectively restrained, and meanwhile a range ambiguity target can be resisted. According to the signal processing method for resisting the inter-pulse false target of the frequency agility radar, due to the fact that the radar system can accurately obtain the hopping rule of the transmitting frequency, when the interested speed sequence is the speed corresponding to the target, the Doppler phase of the target signal can be ideally compensated through the compensation factor, and therefore an accumulation peak value is formed; and because the working frequency of the interference signal is different from the frequency used when the compensation factor is constructed, an accumulation peak value cannot be formed, so that the purpose of suppressing interference is achieved, the target signal generating range ambiguity can be effectively suppressed, and compared with a traditional inter-pulse frequency agility accumulation method, the method has the advantages of better effect, simplicity in implementation and more application advantages.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a signal processing method for frequency-agile radar against interpulse false targets. Background technique [0002] With the development of jamming technology, radar must improve its anti-jamming ability to ensure its effective performance in electronic jamming countermeasures. The traditional pulse Doppler radar, whose operating frequency is fixed between pulses, is susceptible to high-power interference from the enemy, and both the target and the forwarding jamming false target will form peaks in the accumulated output. Nowadays, most of the frequency agility technology is used to make the radar work in the frequency area with no or less interference to improve the anti-interference ability of the radar. However, when the radar system adopts frequency agility between pulses, the target phase It no longer obeys linear changes between pulses, and the...

AI Technical Summary

Problems solved by technology

The traditional pulse Doppler radar, whose operating frequency is fixed between pulses, is vulnerable to high-power interference from the enemy, and both the target and the forwarding jamming false target will form peaks in the accumulated output

Nowadays, most of the frequency agility technology is used to make the radar work in the frequency area with no or less interference to improve the anti-interference ability of the radar. However, when the radar system adopts inter-pulse frequency agility, due to the agility of the inter-pulse frequency, the target phase It no longer obeys the linear change between pulses, and the coherence of the echo signal is affected. The traditional coherent accumulation process cannot form a peak value for the target and the forwarding interference false target, and also cannot achieve the purpose of suppressing interference and detecting the target, thus affecting Subsequent processing of the radar system

On the other hand, for pulse Doppler radar, when the distance between the target and the radar is greater than the maximum distance that can be achieved in the pulse repetition period, the echo signal of the target will not fall within the current pulse period, and the target measured at this time The distance is not the real distance, which will produce false targets with blurred distance

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