A Recognition Method of Intra-pulse Modulation of Radar Emitter Signals with Low SNR

A low signal-to-noise ratio, radiation source technology, applied in character and pattern recognition, instruments, radio wave measurement systems, etc., can solve the problems of increasing the difficulty of recognition and the inability to realize radar radiation source signals, etc.

Inactive Publication Date: 2011-12-14
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

In actual situations, due to the interference of a large amount of noise in the propagation process and the influence of the internal noise of the receiver in the interception process, the radar emitter signal often contains a large amount of noise, and the signal-to-noise ratio is low, so that the useful signal is submerged in the noise, which is greatly affected. Increases the difficulty of identification, and the existing methods cannot effectively identify the intrapulse modulation of the radar emitter signal when the signal-to-noise ratio is less than 0dB

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  • A Recognition Method of Intra-pulse Modulation of Radar Emitter Signals with Low SNR
  • A Recognition Method of Intra-pulse Modulation of Radar Emitter Signals with Low SNR
  • A Recognition Method of Intra-pulse Modulation of Radar Emitter Signals with Low SNR

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Embodiment

[0058] A low signal-to-noise ratio radar radiation source signal intra-pulse modulation identification method, the steps of which include the electronic reconnaissance receiver receiving the radar radiation source pulse signal, after frequency reduction from radio frequency to intermediate frequency and A / D sampling processing, to obtain the radar to be identified For the radiation source signal S(t), this embodiment considers 4 modulation methods, namely CON, LFM, BPSK and BFSK, the signal-to-noise ratio changes from 4dB to -10dB, and the parameters of each radar radiation source signal are set as follows: the pulse width is 4us , the sampling frequency is 500MHz, the carrier frequency of CON is 150MHz, the frequency range of LFM is 50 to 200MHz, the carrier frequency of BPSK is 150MHz, using 13-bit Barker code, the two carrier frequencies of BFSK are 50MHz and 200MHz respectively, and also adopt 13-bit Barker code; then signal S (t) is processed in the signal processing modul...

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Abstract

The invention discloses a intra-pulse modulation and recognition method of a low signal-to-noise radar radiation source signal, which comprises the following steps of: receiving a radar radiation source pulse signal by an electronic reconnaissance receiver, after dimension reduction and A/D sampling process from radio frequency to intermediate frequency, obtaining a radar radiation source signal S(t) having different intra-pulse modulation modes, and processing the signal S(t) in a signal processing module, identifying and outputting intra-pulse modulation mode of the radar radiation source signal. With the method, the intra-pulse modulation mode of multiple radar radiation source signals can be correctly identified when the signal-to-noise is as low as -6dB; and compared with the conventional method for identifying multiple radar radiation source signals, the computational complex O (n2) or (n3) is lower.

Description

Technical field [0001] The invention relates to the technical field of radar radiation source signal identification, in particular to the technical field of radar radiation source signal intrapulse modulation identification. Background technique [0002] Radar emitter signal recognition is a key process in electronic intelligence reconnaissance, electronic support reconnaissance and threat warning systems, and its recognition level is directly related to the technical advancement of radar countermeasure equipment. With the fierce confrontation of modern electronic warfare, new complex system radars are continuously put into use and gradually occupy a dominant position. The signal density of the electromagnetic threat environment is as high as 1.2 million pulses per second, and the radar operating frequency coverage has reached 0.1-20GHz. It is expanding to 0.05-140GHz, and the radar signal waveform changes simultaneously in multiple domains such as time and frequency, and th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G06K9/62
Inventor 张葛祥程吉祥
Owner SOUTHWEST JIAOTONG UNIV
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