Moving target detection method for pulse compression frequency-agile radar

Abstract

The invention belongs to the technical field of radar signal processing and relates to a detection method for a moving target of pulse compression frequency-agile radar. The method comprises the following steps: instead of directly removing a carrier frequency from an echo signal, removing an initial carrier frequency from the echo signal and storing, thereby acquiring a fast-slow time domain echo matrix; constructing a corresponding matching filter according to a residual waveform of each echo pulse, and performing matching filtering on each echo pulse in the fast-slow time domain echo matrix; and performing FFT (Fast Fourier Transform) on each pulse data column in a slow time domain of the fast-slow time domain echo matrix after the matching filtering, thereby realizing the phase-coherent accumulation between the pulses, completing the detection for the moving target and acquiring a moving speed of the target. According to the method provided by the invention, the influence of the agile frequency on the coherence of the pulse signal can be eliminated, the moving target can be detected, and the moving speed of the target can be acquired; and meanwhile, the phase-coherent accumulation can be performed on the echo signal according to the method, so that the detection probability for weak targets can be increased.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a moving target detection method of a pulse compression frequency-agile radar. Background technique [0002] In the modern battlefield environment, electronic countermeasure technology is changing with each passing day. Especially with the development of jamming technology, the traditional system radar is easily suppressed by the enemy's high power due to its fixed carrier frequency, resulting in more and more restrictions on its application. Different from traditional system radar, the signal transmitted by Frequency-Agile Radar (FAR) can make the carrier frequency between adjacent pulses or pulse groups jump randomly at high speed within a certain range, which is a non-stationary signal . The frequency agility characteristic of the frequency-agile radar signal determines that it has the advantages of improving the anti-interference ability, increasing the detec...

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Problems solved by technology

Some scholars propose to accumulate and detect moving targets by constructing compensation items, but the speed of moving targets needs to be searched or pre-estimated through the compensation method, which requires a large amount of calculation; other scholars propose to set specific signal parameters to ensure The coherence of the signal makes use of MTD to complete the detection of moving targets, but eliminating the influence of frequency agility on the coherence by changing the parameters of the transmitted signal will bring new requirements to the design of the radar and increase the complexity of the design; and Some scholars have proposed to use the same frequency pulse between frame and frame of agile frequency signal to carry out MTD algorithm to detect moving targets, but this will bring problems such as low data rate and speed ambiguity.

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