Planning method of pulse time sequence of LPI (Low Probability of Intercept) radar

Abstract

The invention discloses a planning method of a pulse time sequence of an LPI radar. The method mainly comprises that a radar whose detection range includes a target is determined; N pulse signals emitted by the radar within a coherent process interval are determined; according to the total number N of the pulse signals emitted by the radar within the coherent process interval, a time interval vector t of the N pulse signals is set; the radar receives echoes of the N pulse signals after that the N pulse signals emitted in the coherent process interval pass a target, and a vector S of N pulse echo signals and an amplitude-frequency response matching filtering function are obtained successively according to the time interval vector t of the N pulse signals; further a minimum and maximum Doppler sidelobe target function is constructed; and the minimum and maximum Doppler sidelobe target function is solved to obtain an optimized time interval factor t<^> of the N pulse signals. The optimized time interval vector t<^> of the N pulse signals serves as a planning result of the pulse time sequence of the LPI radar.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to a pulse time sequence planning method for low-interception radar, which is suitable for anti-reconnaissance and low-interception. Background technique [0002] Low probability of intercept radar (low probability of intercept radar) means that the radiated signal of a radar system is lower than the detection threshold of the opponent's electronic intelligence receiver, and at the same time, the target can still be found within the operating range. In short, LPI radar can The target is detected at the same time as it is spotted by the intercept receiver. [0003] In the previous radar anti-reconnaissance and anti-jamming, in order to reduce the reconnaissance performance of the reconnaissance aircraft to the radar, for the single-step radar, the method of changing parameters such as staggered repetition frequency, frequency agility or low interception probability radar signal was mai...

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Problems solved by technology

[0003]In the previous radar anti-reconnaissance and anti-jamming, in order to reduce the reconnaissance performance of the reconnaissance aircraft to the radar, for the single-step radar, the staggered repetition frequency and frequency agility are mainly used Or the way of changing parameters such as low probability of interception radar signal, etc., but these ways are in exchange for countermeasure performance at the cost of complex processing; for multiple radars, such as multiple input multiple output (MIMO) radar, the number of devices The way to improve the performance of the confrontation. These two processing methods have the defects of complex processing and high overhead.

[0004]Pulse deinterleaving is a very important link for the intercept receiver to obtain radar information. The parameters of a single pulse complete the pulse deinterleaving; when there are several pulses in space at the same time, these continuous pulses may come from multiple radiation sources, at this time, the intercept receiver uses the pulse deinterleaving technology to interleave the pulses from the same radiation source The pulse trains are separated and grouped into a pulse group. The pulse parameters available for pulse deinterleaving technology include pulse repetition frequency, radio frequency, pulse width, angle of arrival, etc.; however, in complex environments, when the angle of arrival cannot be effectively In the case of selection, usually the carrier frequency cannot be completely diluted, and the pulse width data often jitters greatly due to the modulation caused by measurement and scanning, which is not suitable for main sorting. At this time, the prediction based on the pulse description word In addition to the direction of arrival, the sorting largely depends on the frequency-repeated sorting. The frequency-repeated sorting technology mainly extracts effective pulses according to the radar parameter pulse repetition interval or repetition frequency, which is calculated by calculating the arrival time of all pulses. The time interval between any two received pulses is drawn as a histogram with its frequency, and then the pulse repetition period is found. For other repetition frequency sorting techniques, the histogram is also used as the basis for processing. Yes, there will be one or more peaks in the histogram, so that the pulse repetition period of the radar is screened out to obtain the pulse interval information of the radar signal

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