Design of phase-coded transmitter and high sensitive receiver of radar system

Abstract

This paper reports experimental results of a radar system design. In the radar transmitter, a 13-bit Barker code with bit duration 3.24 µs and various other codes are generated by the microcontroller PIC16F877A. This code is then used to modulate IF 10.3 MHz to become BPSK signal. A stable local oscillator is also designed by PLL, VCO, and PIC16F877A. The operation frequency range of the oscillator is from 800 MHz to 900 MHz with an error only about ±10 Hz. A microwave power amplifier is fabricated with structure of two stages of 45 W and 90 W in case of input 300 mW. In this amplifier microstrip technique is implemented for input/output matching network. In the receiver, subsystem can receive and decode very small signal with amplitude from -30 dBm to -108 dBm and frequency range from 800 MHz to 900 MHz.