Abstract
Hybrid modulation continuous waveform (HMCW) proximity detectors emit binary phase-coded chirp (BPCC) waveforms. Therefore, they possess the advantages of binary phase-coded modulation and chirp modulation simultaneously. To enhance the anti-sweep-jamming performance of HMCW detectors, this paper analyses the response of an HMCW detector under sweep jamming and proposes an anti-jamming method based on the novel average range side lobe (ARS) approach. Similar to the instant correlation with harmonic demodulation (ICHD) method, the ARS method also combines time-domain instantaneous correlation with frequency-domain harmonic demodulation to obtain the range information of the target. The difference is that the ARS method uses a fast Fourier transform (FFT) instead of a band pass filter (BPF) to extract the harmonic envelope and averages multiple harmonic coefficients obtained via the FFT. Because the correlation side lobes of chaotic codes follow a Gaussian distribution, the output of an HMCW detector under sweep jamming is suppressed after ARS processing. The proposed method is proven to be feasible and effective through numerical simulations. The results show that the ARS method offers improved anti-sweep-jamming performance.
Highlights
Continuous waveform (CW) detectors maintain high signalto-noise ratios while requiring much less peak power than corresponding pulse sensor systems [1]
An average range side lobe (ARS) method that uses fast Fourier transform (FFT) to extract the harmonic envelope and averages multiple harmonic coefficients obtained via the FFT is proposed according to the statistical characteristics of the output of the Hybrid modulation continuous waveform (HMCW) detectors under sweep jamming
Because the velocity of the target satisfies v0 c, we can assume that the radial distance between the HMCW detector and the target is constant over a time interval of GPTc
Summary
Continuous waveform (CW) detectors maintain high signalto-noise ratios while requiring much less peak power than corresponding pulse sensor systems [1]. The ICHD method combines time-domain instantaneous correlation with frequency-domain harmonic demodulation to obtain the range information of the target It makes the most of the correlation performance of the HM waveform and has good noise suppression ability. References [27]–[29] designed a CW random binary phase modulation radar with side lobes of approximately −30 dB This radar took advantage of the statistical characteristics of random binary codes to achieve greatly improved anti-jamming performance. This radar was not suitable for high-speed targets, as its ranging principle was complex, and its real-time performance was poor. It retains the noiselike characteristics of the chaotic codes while having a wider bandwidth
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
