300-2000MHz broadband digital TR (Transmitter-Receiver) assembly

Abstract

The invention provides a 300-2000MHz broadband digital TR (Transmitter-Receiver) assembly. In an emission state, an FPGA controls a DDS to generate a corresponding waveform signal with an intermediatefrequency of 400MHz through the frequency control word, the waveform control word and the initial phase control word; 1600MHz or 4600MHz low local oscillator signals in a frequency mixer and a localoscillator distribution circuit generate high and intermediate frequency signals with frequencies of 2000MHz or 5000MHz respectively; through the filtering selection effect of a switch filtering groupand by the effect of mixing with high local oscillator signals with frequencies of 2300-3000 MHz or 6-7 GHz in the local oscillator distribution circuit, transmitting signals with the frequencies respectively ranging from 300-1000 MHz and 1000-2000 MHz are generated respectively, and the receiving and transmitting switching function is achieved through a circulator. According to the invention, afrequency range of 300-2000 MHz is divided into two frequency bands for frequency conversion processing; and finally, waveform generation and echo sampling processing are respectively realized by thelow-speed ADC and the DAC, the preprocessing difficulty of the digital assembly is reduced, in-band stray introduced by frequency conversion is avoided, and the assembly has the advantages of low cost, high integration level, flexible design and the like.

Description

technical field [0001] The invention relates to the field of radar, in particular to a TR component, which is mainly aimed at the front-end design of an L-band broadband active digital phased array radar. Background technique [0002] Active Phased Array (AESA) technology is a new radar technology that has developed very rapidly in recent years. Compared with traditional radar technologies such as monopulse and pulse Doppler, phased array technology will bring a more profound impact on the development of radar technology. The advantage of AESA technology is that the radar beam can hop freely in space very quickly. It is possible to keep the antenna array from rotating to make the radar beam point to any airspace, or to rotate the antenna so that the beam is fixed to point to a certain area within a certain period of time, which cannot be accomplished by traditional mechanical rotating radars. The successful application of AESA is a revolution to the traditional airborne ra...

AI Technical Summary

Problems solved by technology

At present, 300-2000MHz wideband digital TR components have not been reported yet. If the design of 300-2000MHz wideband digital TR components is completed by direct radio frequency generation and sampling, the main problem is high sampling rate (to avoid Nyquist overlap) ) introduces high design difficulty and high cost, it is urgent to solve this problem

Images