"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 12, 2017

contents             full textpdf   

A method for quick calculation of received signal with chirp in the SAR with demodulation of pulses in the mixer of receiver

S. N. Kireev 1, O. A. Pribytkova 2

1 Ural Federal University named after the first President of Russia B.N.Yeltsin, Mira street 19, Ekaterinburg 620002, Russia
Ural Design Bureau «Detal» JSC, Pionerskaya street 8, Sverdlovsk region, Kamensk-Uralskiy 623409, Russia


The paper is received on November 26, 2017


Abstract. In this article we consider a problem of digital simulation of a received signal for SAR, which uses pulse package with chirp. Chirp demodulation is carried out in a receiver mixer by local oscillator, which has chirp with the same steepness. Surface surveillance is performing in a sector scan mode. Surface model contains thousands of resolution elements. It is necessary to calculate hundreds of thousands of time samples for each point. The direct calculation for so many samples results in unacceptable time expenditure. The method of fast calculation is known. This method is based on multiplication of two matrices of samples. The first matrix includes the chirp law and contains samples for one repetition period. The second matrix includes slow processes and contains one sample for each repetition period. Factorization of computational formula speeds up model operation hundreds times as much. However, known method does not allow the peculiarities of pulse package processing in the SAR under consideration. By sector scan, the target has greater radial velocity caused by SAR moving. In the task of modeling of received signal the fast moving makes factorization of computational formula difficult. The method of fast calculation of the received signal for the model of the described SAR is offered in this work. Admissible conditions of practical application of the offered method of analysis are estimated. Compensation of relative motion of SAR is carried out before factorization of the design formula in order to expand the conditions of practical application. The method provided more than 200 times acceleration of the calculation.

Key words: SAR, chirp, digital simulation, factorization, compensation of motion.


1. Kireev S.N. The algorithm of fast calculation of the received signal for the model PCA. Radiotekhnika - Radio engineering, 2008, No 9, p. 35-40. (In Russian)

2. Shirman Ya.D., Mangos V.N. Teoriya i tekhnika obrabotki radiolokacionnoj informacii na fone pomekh. [Theory and technics processing of radar information against the background of interference]. Moscow. Radio i svyaz' Publ. 1981. 416 p. (In Russian).

3. Adodin V.M., Kireev S.N., Pribytkova O.A. An algorithm for quick calculation of received signal for SAR model that uses a packet chirp pulses and a receiver with generalized heterodyne. Materialy dokladov Mezhdunarodnoj nauchno-prakticheskoj konferencii: v 2 ch. - CH.1. [Reports of the International scientific-practical conference]. V 1. Tomsk, V-Spectr Publ, 2012, p.14-17. (In Russian)

4. Kireev S.N., Pribytkova O.A. A method for quick calculation of received pulse burst with chirp when it is processed with generalized heterodyne. Radiovysoto­metriya-2016: Sbornik trudov Pyatoj vserossijskoj NTK. [Reports of the Fifth All-Russian scientific-practical conference]. Yekaterinburg: Fort Dialog-Iset’ Publ, 2016, p. 189-194. (In Russian)

5. Kondratenkov G.S., Frolov A.Iu. Radiovidenie. Radiolokacionnye sistemy distancionnogo zondirovaniya Zemli. [Radio-wave imaging. Radiolocation systems of remote sensing of the Earth]. Moscow. Radiotekhnika Publ. 2005. 368 p. (In Russian)


For citation:

S. N. Kireev, O. A. Pribytkova. A method for quick calculation of received signal with chirp in the SAR with demodulation of pulses in the mixer of receiver. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 12. Available at http://jre.cplire.ru/jre/dec17/1/text.pdf. (In Russian)