Digital signal processor and digital signal processing method for ship-navigation radar

Abstract

The invention relates to the field of radar signal processing, in particular to a digital signal processor and a digital signal processing method for a ship-navigation radar. By an 'FPGA (field programmable gate array) +DSP (digital signal processor)' structural style, high logic control capability of an FPGA and the high-speed signal processing capability of a DSP are adopted sufficiently. Compared with the traditional ship-navigation radar digital signal processor, the digital signal processor is high in processing capability, high in storage capability and high in expandability, and has a flexible interface; an Ethernet communication function is fulfilled, the radar digital signal processor can move to an upper unit of a ship radar by an Ethernet communication mode, after processing is finished, radar echo data are transmitted to a display terminal of a lower unit of the radar through an Ethernet, and the problems of signal attenuation and signal interferences when the traditional ship radar signal processor receives video signals in a long distance are solved effectively; and the existing ship navigation radar digital signal processing method is improved, the anti-interference capability and the clutter suppression capability are high, and a signal processing effect is high.

Description

technical field [0001] The invention relates to the field of radar signal processing, in particular to a digital signal processor and processing method for ship navigation radar. Background technique [0002] The radar signal processor is an important part of the radar system, which mainly completes the functions of sampling, processing and transmitting the video signal output by the radar receiver. Early radars used analog circuits to process signals, which not only had a complex structure, but also the circuits themselves were highly susceptible to interference. With the development of digital technology, radar signal processing is transferred to digital circuits. Due to the different environments and uses of radar, the structure and functions of radar signal processors are also different. As an application of radar in navigation technology, ship navigation radar can provide navigation and collision avoidance functions for sailing ships. However, most of the ship navigat...

AI Technical Summary

Problems solved by technology

However, DSP instructions are more suitable for implementing algorithms rather than logic control, and the versatility of its external interface is poor, and the control of the radar system is not flexible enough

Li Bo of Dalian Maritime University designed an FPGA-based ship radar digital signal processor, all functions of which are implemented by FPGA. Although FPGA has logic control capabilities that DSP cannot match, FPGA is more complex in algorithm implementation than general processors. It needs to be high, and the requirements for on-chip resources are also high when implementing complex algorithms, which can only be realized by mid-to-high-end FPGA chips, which makes the development cycle long and costly, which is not conducive to the realization of engineering

[0004] In addition, the existing ship navigation radar digital signal processor is designed in the lower unit of the radar (including the signal processor and display terminal) to receive the video signal output from the upper unit of the radar (including the radar transmitter, receiver, and antenna) Due to the special use environment of ship radar, the distance between the upper unit and the lower unit of the radar is often more than ten meters. This design method requires the transmission of analog signals, which will inevitably cause signal attenuation and be affected by various interferences.

Images