DSP-based high speed constant false alarm rate detector and detection method thereof

Abstract

The invention discloses a DSP (Digital Signal Processor) based high speed constant false alarm rate detector and a detection method thereof. The detector consists of a slide-window module, a detection threshold calculating module and a signal detecting module which are connected in such a way that a signal to be detected firstly enters the slide-window module, a detection unit, a protection unit and a reference unit are filtered, a required detection threshold is calculated via the detection threshold calculating module, and finally whether a target exists in the detection unit or not is judged by the signal detecting module. The detection method comprises the following six steps of: 1, determining the quantity of the constant false alarm rate and the reference unit, calculating a detection threshold of the constant false alarm rate by using a formula, and judging whether a target exists or not according to the calculated result; 2, calculating a detection threshold of another test unit; 3, finishing SIMD (Single Instruction Multiple Data) processing mode by TS201; 4, judging whether a target exists or not by a branched prediction mechanism of TS201; 5, performing DAB (Digital Audio Broadcasting) when addressing four continuous sample data; and 6, increasing the parallelism degree of an instruction as much as possible in order to improve the processing efficiency of the detector.

Description

(1) Technical field: [0001] The invention relates to a DSP (Digital Signal Processor)-based high-speed constant false alarm rate (CFAR) detector and a detection method thereof, belonging to the technical field of radar detection. (two) background technology: [0002] Radar is the primary tool for detecting targets in both military and civilian applications. The main task of radar is to detect and measure useful targets from the air, ground or water in the background of noise, clutter and interference, and provide accurate target information for various combat systems. In essence, the problem of radar signal detection is the problem of judging whether there is a target signal at a certain coordinate position or not. In radar automatic detection systems, automatic detection and constant false alarm rate (CFAR, constant false alarm rate) technology are usually used in combination to maintain predictable detection performance and constant false alarm rate in changing clutter en...

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Problems solved by technology

[0005] Among the above-mentioned methods for realizing CFAR, it is simple to use PC software to realize CFAR detection and development, but the speed usually cannot meet the requirements of real-time processing, and it is not suitable for application in large-scale radar detection systems; using FPGA to realize CFAR processing has high Processing speed, but it has the disadvantages of difficult development, long cycle and poor flexibility; it is difficult to guarantee real-time processing by using ordinary DSP to realize CFAR processing. Only a high-performance DSP with high internal parallelism can take into account the real-time and flexibility of CFAR processing. sex

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