Application of FMCW system T/R unit in digital phased array

Abstract

The invention discloses application of FMCW system T / R unit in a digital phased array. The T / R unit comprises a radio frequency transmit-receive module, a digital waveform generator, a digital intermediate frequency receiver, an optical fiber communication module and a power supply module. The amplitude and phases of multipath DDS signals are controlled under a wave control instruction of the system, and radiofrequency signals are obtained through up conversion and radiated out through an antenna to form oriented transmit-receive wave beams in the air. The receiver converts the oriented transmit-receive wave beams into intermediate frequency signals through down conversion, and the digital intermediate frequency receiver suppresses emission leakage signals of FMCW through IF cancellation processing technology, thereby realizing transmit-receive isolation function of an FMCW radar system. Reception signal data flows are obtained by conducting IF digital sampling on target signals, and gathered to a terminal processing computer through a fiber interface to obtain digital reception wave beams, thereby realizing phased array radar function. The FMCW system T / R assembly is combined with digital array radar to obtain excellent distance resolution and doppler velocity measurement performances that are inherent characteristics of a FMCW radar system. The average power of a transmitter is greatly increased, and the detection performance of a digital phased array radar is improved.

Description

technical field [0001] The invention relates to the technical field of phased array radar, in particular to the application of a FMCW system T / R unit in a digital phased array. Background technique [0002] Phased Array Radar (English: PhasedArrayRadar, PAR) is a phase-controlled electronically scanned array radar, which uses a large number of controllable small antenna units arranged into an antenna array, and each antenna unit is controlled by an independent switch, based on the Huygens principle. By controlling the time difference between the transmissions of each antenna element, main beams with different phases (directions) can be synthesized, and the phase can be changed in both axes; similar to Thomas Young's double-slit experiment, each phase shifter of the phased array The emitted electromagnetic waves are enhanced and synthesized into a nearly straight radar main lobe by the principle of constructive interference, while the side lobes are greatly reduced due to int...

AI Technical Summary

Problems solved by technology

[0004] Although phased array radar has excellent performance, it is mostly used for military purposes because of its high cost and high operating cost. The more famous phased array radars such as the AN / SPY-1 passive phased array radar of the American Burke-class destroyer, and the Chinese 052D The Type 364A active phased array radar of the Type Destroyer, the American AN / FPS-115 "Paving Claw" long-range early warning radar, the AN / APG-77 active phased array radar of the American F-22 fighter jet, etc.

Images