"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 12, 2018

contents of issue      DOI  10.30898/1684-1719.2018.12.7     full text in Russian (pdf)  

Phase-coded radar signals for determining the precise range and velocity os small-sized space objects

 

A. I. Baskakov, R. N. Ipanov, A. A. Komarov

National Research University MPEI, Krasnokazarmennaya 14, Moscow, 111250, Russia

 

The paper is received on November 30, 2018

 

Abstract. For detecting the precise range and velocity of a collection of small near-Earth space objects and resolving individual elements of complex space objects and small Earth-surface objects, broadband sounding signals with a high slant range and radial velocity resolution should be used. To provide a high angular resolution of small space objects or their elements based on the inverse antenna aperture synthesis effect, long-duration sounding signals should be used. The broadband long-duration signals to be used are a train of linear frequency modulated (LFM) pulses with a high repetition rate and signals with ‘spectrum synthesis’ that are a train of square radio pulses with a duration Tp, pulse-to-pulse spacing 1/Tp and pulse ratio q > 2. However, it is commonly known that frequency modulated and manipulated signals have an oblique ambiguity function resulting in range ambiquity. Ambiguity peaks appear in the autocorrelation function of the LFM pulse train.

For the purpose of detecting the precise range and velocity of small near-Earth space objects and resolving individual elements of complex space objects, a polyphase (p-phase, where p is a prime) radar signal is synthesized, which signal has a region of zero sidelobes in the vicinity of the central peak of the autocorrelation function. The signal, which is called polyphase coherent complementary signal, represents a train of p coherent phase-code manipulated pulses encoded by complementary sequences of a p-ary D-code with the length of N=pk , k>=2 - integer. A method for forming a set of 2k-2 p-ary D-code ensembles is proposed for synthesis of the signal. The correlation characteristics of the synthesized signal are analyzed.

Keywords: pulse train, polyphase signal, complementary sequences, autocorrelation function, zero correlation zone, Vilenkin-Chrestenson functions.

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For citation:
A. I. Baskakov, R. N. Ipanov, A. A. Komarov. Phase-coded radar signals for determining the precise range and velocity os small-sized space objects. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 12. Available at http://jre.cplire.ru/jre/dec18/7/text.pdf

DOI  10.30898/1684-1719.2018.12.7