Broadband channelization reception system of radar with external radiation source and FPGA (Field Programmable Gate Array) implementation method

Abstract

The invention discloses a broadband channelization reception system of radar with an external radiation source and an FPGA (Field Programmable Gate Array) implementation method. The FPGA implementation method comprises the steps of: dividing received radar broadband signals into multiple paths of analogue signals through a power division filter module; transmitting each path of analogue signals after AD (Analogue-Digital) conversion into an FPGA for frequency point separation; converting to a baseband through down-conversation in the FPGA; sequentially carrying out a multi-phase structured deceleration treatment, channelization treatment, FIFO (First In First Out) series and parallel conversion treatment and FFT (Fast Fourier Transformation) on baseband signals; and finally outputting output signals of any eight frequency points through the FPGA. The reception system comprises a power division filter module, an analogue-digital conversion module and an FPGA frequency point separation module. According to the invention, echo signals of the radar are subjected to a segmental treatment, and the same treatment is adopted for the signal separation process of each path of the analogue signals after the segmentation. Different clock frequencies are adopted at different treatment stages of the FPGA frequency point separation. According to the broadband channelization reception system of the radar with the external radiation source and the FPGA implementation method, disclosed by the invention, the difficulties of great equipment amount and high development cost when the traditional reception system of the radar with the external radiation source implements synchronous reception of multiple signals of the broadband signals are solved; and complexity and cost of the system structure are decreased.

Description

technical field [0001] The invention belongs to the technical field of radar, and mainly relates to a radar receiver part, in particular to an external radiation source radar broadband channelized receiving system and an FPGA implementation method for receiving external radiation source radar signals. technical background [0002] In recent years, the passive radar detection technology using radio, television, satellite and other civil radiation sources has received more and more attention in the industry. The passive radar system itself does not need to transmit signals, but uses the existing electromagnetic wave signals in the environment or the target itself for target detection and positioning, so it solves the problem that the transmitted signals of conventional active radars are easy to be detected by the enemy. Interception, and therefore vulnerable to electronic jamming and anti-radiation missile attacks, has the comprehensive "four resistance" potential of anti-jamm...

AI Technical Summary

Problems solved by technology

However, there are shortcomings: the method of multiple single-channel parallel work increases the cost of the system and increases the complexity of the synchronization of the entire parallel system, while the method of multi-channel parallel synchronization works when the number of channels is relatively large and the index requirements are relatively high. The complexity of signal processing will also increase, and at the same time, the feasibility of device implementation is very high.

[0004] In order to meet the needs of an information-based battlefield with an increasingly complex electromagnetic environment, a new method and technology to realize simultaneous multi-signal reception in the receiving system of the external radiation source radar to overcome the shortcomings of traditional receiving equipment with large quantities and high complexity has become Current Research Emphasis in the Field of Radar Reception

Images