Missile-borne SAR (synthetic aperture radar) imaging real-time signal processing system

Abstract

The invention discloses a missile-borne SAR imaging real-time signal processing system. The system includes an A / D acquisition module, an FPGA (field programmable gate array) main control module, a DSP (digital signal processor) imaging module, a DSP tracking module, an upper computer interface module, and a servo interface module. The A / D acquisition module carries out an analog to digital conversion of radar echo; the FPGA main control module is used for data preprocessing, and for controlling and coordinating work of other modules; the DSP imaging module is used for receiving preprocessed data, carrying out imaging processing of the preprocessed data, and sending a process result to the FPGA main control module; the DSP tracking module is used for receiving the preprocessed data, carrying out an angle measurement tracking process, and sending a process result to the FPGA main control module; the upper computer module is used an internal system debugging of a laboratory; the servo interface module is used for sending missile body status information to the FPGA module and receiving a control command from the FPGA module at the same time, so as to control the missile body. The system of the invention has advantages of a small size, low power consumption, high reliability, and excellent function and the like, and is especially suitable for the high speed aircraft guidance field and other fields.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a real-time imaging signal processing system of a missile-borne synthetic aperture radar (Synthetic aperture radar SAR) based on a single-chip FPGA+multi-chip DSP chips in the technical field of radar digital signal processing. The invention can receive the intermediate frequency echo signal output by the radar, perform analog-to-digital conversion, digital down-conversion, real-time imaging, image detection, target recognition, single-pulse angle measurement and tracking processing, and at the same time realize the control of other extensions or equipment to achieve accurate guidance purpose. Background technique [0002] With the development of SAR imaging technology, airborne and spaceborne SAR technology has been continuously matured and perfected, and is being used more and more widely. Missile-borne SAR has also become a hot research topic today. Missile-borne ...

AI Technical Summary

Problems solved by technology

The deficiencies that still exist in this patent application are: firstly, the system uses two signal processing boards and integrates multiple FPGA signal processing chips, which leads to a relatively complicated system structure and a large volume

Secondly, the two signal processing boards of the system are connected through connectors, which are susceptible to external interference when transmitting data, resulting in a high bit error rate

Thirdly, the system has low real-time performance and can only work on slow level-flying carriers such as UAVs and small spacecraft, and cannot meet the high real-time requirements of missiles.

Thirdly, the system only involves SAR imaging, the function is simple, and it cannot handle target detection and single pulse angle measurement tracking.

Finally, the digital-to-analog conversion chip used in the system has a low sampling rate and cannot sample high-frequency and large-bandwidth signals.

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