Zhurnal Radioelektroniki - Journal of Radio Electronics. eISSN 1684-1719. 2020. No. 6
ContentsFull text in Russian (pdf)
DOI https://doi.org/10.30898/1684-1719.2020.6.11
UDC 621.391.81:621.396.96
POLYPHASE FREQUENCY SHIFT KEYED PROBING SIGNALS WITH ZERO AUTOCORRELATION ZONE FOR THE SYNTHETIC APERTURE RADAR
R. N. Ipanov
National Research University MPEI, Krasnokazarmennaya 14, Moscow 111250, Russia
The paper was received on March 23, 2020, after correction – on June 11, 2020
Abstract. Well-known space synthesized aperture radars (SAR) for remote sensing of the Earth use signals with linear frequency modulation till now. At the same time, an increasing interest of radar experts to signals with phase-coded shift-keying (PCSK) should be noted. This makes it possible to improve the quality of radar images. It is known also that the use of polyphase probing PCSK-signals makes it possible to increase the radar radiation security substantially. In this paper a polyphase (p-phase where p is a prime integer number) probing signal with zero autocorrelation zone (ZACZ) has been synthesized for SARs. The signal is a sequence of p PCSK-pulses encoded with complementary sequences of the p-ary D-code with additional frequency shift-keying of the sub-pulses of pulses. A comparative analysis of the correlation characteristics of the synthesized three-phase signal with a signal without modulation of discretes and with a PCSK-signal encoded with a ternary M-sequence (MS) is carried out. Overall correlation characteristics of the signal ensemble used in the mode of the radar aperture synthesis have been also analyzed. The analysis revealed that in the case of a mismatch by Doppler frequency, the root-mean-square level of the side lobes (SL) of autocorrelation function (ACF) of the synthesized signal were more than by 8.5 dB less than the root-mean-square level of the SLs of the ACF of the PCSK-signal encoded with a MS. The total ACF of the ensemble consisting on nine signals has zero SLs along the entire time axis τ, and in the case of a mismatch by frequency in the ZACZ, the root-mean-squire level of SLs is more than by 25 dB less than the root-mean-square level of the SLs of the total ACF of cyclical ensemble consisting on nine PCSK signals encoded with a MS.
Keywords: ambiguity function, autocorrelation function, complementary sequences, pulse train, probing signal, zero autocorrelation zone.
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For citation:
Ipanov R.N. Polyphase frequency shift keyed probing signals with zero autocorrelation zone for the synthetic aperture radar. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2020. No. 6. Available at http://jre.cplire.ru/jre/jun20/11/text.pdf. DOI: https://doi.org/10.30898/1684-1719.2020.6.11