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Abstract
This paper proposes a method that utilizes AR model power spectrum estimation based on Burg algorithm to estimate the number of carrier frequency in single pulse. In the modern electronic and information warfare, the pulse signal form of radar is complex and changeable, among which single pulse with multi-carrier frequencies is the most typical one, such as the frequency shift keying (FSK) signal, the frequency shift keying with linear frequency (FSK-LFM) hybrid modulation signal and the frequency shift keying with bi-phase shift keying (FSK-BPSK) hybrid modulation signal. In view of this kind of single pulse which has multi-carrier fre- quencies, this paper adopts a method which transforms the complex signal into AR model, then takes power spectrum based on Burg algorithm to show the effect. Experimental results show that the estimation method still can determine the number of carrier frequencies accurately even when the signal noise ratio (SNR) is very low.
Highlights
With the rapid development of weapons technology, the ratio of conventional radar signals reduced gradually
The difference between the hybrid modulation radar signal and the frequency shift keying (FSK) hybrid modulation signal is shown by their narrow-band random modulation within their sub-pulse
In view of the frequency modulation characteristics of the three kinds of the complex radar signals, the authors use the AR model power spectrum estimation algorithm [3] to estimate the number of carrier frequencies in single pulse based on Burg algorithm
Summary
With the rapid development of weapons technology, the ratio of conventional radar signals (such as the single carrier frequency, the fixed repetition frequency and the no modulation in pulse signal) reduced gradually. A typical characteristic of the intra-pulse hybrid modulation signal is that a single pulse signal contains two to four sub-pulses with coherent frequency. In terms of the current complex radar signal, the modulation forms of the sub-pulse are fundamentally the same. Complex radar intra-pulse modulation forms mainly include as follows: FSK, FSK-LFM, and FSK-BPSK. In view of the frequency modulation characteristics of the three kinds of the complex radar signals, the authors use the AR model power spectrum estimation algorithm [3] to estimate the number of carrier frequencies in single pulse based on Burg algorithm. The algorithm can still determine the number of carrier frequency of sub-pulses accurately even in the low SNR circumstance
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