Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 994-999.doi: 10.13229/j.cnki.jdxbgxb20180003

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Design and analysis of NLFM⁃Costas RF stealth radar signal

Yin⁃juan FU(),Yong LI(),Li⁃qin XU,Kun⁃hui ZHANG   

  1. Department of Electronics Engineering, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2018-01-03 Online:2019-05-01 Published:2019-07-12
  • Contact: Yong LI E-mail:ffuyinjuan@163.com;ruikel@nwpu.edu.cn

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Abstract:

This paper presents the Nonlinear Frequency Modulation (NLFM)?Costas hybrid signal with the complex methods of interpulse Costas frequency coded modulation and intrapulse Nonlinear Frequency Modulation (NLFM). The signal construction is analyzed in theory and four critical parameters are obtained, such as Power Spectrum Density (PSD), ambiguity function, Peak Sidelobe Level (PSL) and Integral Sidelobe Level (ISL). The experimental results show that the NLFM?Costas hybrid signal has the “thumbtack” ambiguity function and better autocorrelation property. The NLFM?Costas signal can achieve better RF stealth performance than NLFM signal or Costas signal or LFM?Costas hybrid signal and it has good application prospects in modern battlefield environment.

Key words: information processing technology, RF stealth, intercept factor, ambiguity function, autocorrelation function, peak sidelobe level(PSL), integral sidelobe level(ISL)

CLC Number: 

  • TN958

Fig.1

Time?frequency curve of Costas signal"

Fig.2

PSD of Costas signal"

Fig.3

Ambiguity function of Costas signal"

Fig.4

Autocorrelation function of Costas signal"

Table 1

Autocorrelation properties of NLFM signal"

指标 Hamming Blackman Hanning Taylor
PSL/dB -28.84 -29.51 -25.61 -29.07
ISL/dB -23.79 -23.79 -21.27 -23.51
主瓣/μs 0.026 0.032 0.028 0.026

Fig.5

Time?frequency curve of NLFM signal"

Fig.6

PSD of NLFM signal"

Fig.7

Autocorrelation function of NLFM signal"

Fig.8

Ambiguity function of NLFM signal"

Fig.9

Time?frequency curve of NLFM?Costashybrid signal"

Fig.10

PSD of NLFM?Costas signal"

Fig.11

Ambiguity function of NLFM?Costas signal"

Fig.12

Local autocorrelation of NLFM?Costas signal"

Table 2

Comparisons of autocorrelation properties"

指标 Costas NLFM NLFM?Costas LFM LFM?Costas
PSL/dB -13.59 -28.84 -44.84 -13.44 -17.89
ISL/dB -10.22 -23.79 -41.60 -9.84 -17.05
主瓣/μs 0.049 0.026 0.022 0.024 0.016

Fig.13

Local autocorrelation of LFM?Costas signal"

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