Design and Manufacture of Traveling-wave Electro-optic Modulator for X-band LFM Signal Generation

In this paper, a photonic-based microwave system technology is described, and a traveling-wave electro-optic modulator is designed and manufactured as a key component. The fabricated modulator is composed of a metal diffusion waveguide for optical transmission and a planar waveguide electrode on lithium niobate substrate for microwave transmission. The electro-optic response bandwidth of I and Q channels in a fabricated dual parallel Mach-Zehnder modulator were measured for 27.67 and 28.11 GHz, respectively. Photonic four times up-converted X-band frequency and linear frequency modulated signal were confirmed using the fabricated electro-optic modulator by S-band input signal. The confirmed broadband signal can be applied to a microwave system for surveillance and high-resolution ISAR imaging.

Monopulse radar tracking by range and angular coordinates with a broadband sounding signal.

A block diagram of the receiving part of a monopulse radar tracking by range and angular coordinates with a broadband sounding signal is presented. The features of correlation processing of a broadband linear-frequency-modulated signal with full frequency demodulation and algorithms for estimating coordinates are considered. A comparative analysis of the results of calculating errors in measuring the coordinates of air targets in short-range radars using narrow-band and broadband signals and different viewing angles is carried out.