Studies of a Dual-frequency EBSPK-MODEM Based Radar-communication Transceiver

For a dual-frequency Continuous Wave (CW) radar, ambiguity may occur in ranging measurement. In order to solve this problem and integrate radar and communication system, a new dual-frequency electronic system based on Extended Binary Phase Shift Keying (EBPSK)-MODEM is put forward. The system is mainly composed of two EBPSK-MODEM with different carriers, where modulator 1 transmits CW, while modulator 2 transmits EBPSK signals, but two echo signals are compared in a phase discriminator. The high-precision ranging value can be obtained. The other received EBPSK signals are also demodulated by using an impacting filer, which can convert the phase hopping into amplitude shock as the echo of pulse radar. Pulse radar echo signal can be dectected in CW background, and the output of impacting filer is wide-range measured value. After data fusion of two channel measuring, the system would output a radar measurement with both high-precision and wide-range. The radar system can also be used as a spectra efficient digital communication system by utilizing the advance of EBPSK modulator and the impacting filter aided demodulator.