Space-time adaptive processing method based on co-prime pulse recurrence interval and apparatus thereof

Abstract

The invention is suitable for the radar signal processing and array signal processing technology field and provides a space-time adaptive processing method based on a co-prime pulse recurrence interval and an apparatus thereof. The method comprises the following steps of step S1, receiving pulses emitted by using a co-prime way and using time delay among the received pulses to construct a virtual pulse Ps; step S2, according to the constructed virtual pulse, constructing a virtual snapshot xv; step S3, using the constructed virtual snapshot to estimate a covariance matrix RCPRI-SMI of clutters and noises; and step S4, using the acquired covariance matrix to design a space-time filter so as to carry out clutter suppression. By using the method and the apparatus of the invention, a distance and doppler ambiguity can be solved to some extent, a capability of electronic interference resistance can be increased and simultaneously flexibility of a system can be increased too.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and array signal processing, and in particular relates to a space-time adaptive processing method and device based on a coprime pulse repetition interval. Background technique [0002] Moving Target Indicator (MTI) is a well-known linear filter used for clutter suppression in pulse Doppler airborne radars. Typically, it sends pulses with a constant pulse repetition interval (PRI) and uses the difference in Doppler frequency between the target and clutter to detect the target. However, MTI performs clutter suppression only in the Doppler domain and suffers performance degradation when targets are obscured by the Doppler spread of clutter. Different from MTI, space-time adaptive processing (STAP) can perform clutter suppression in both the Doppler domain and the space domain, and is an effective tool for detecting small or slow targets in strong clutter environments. [0003] Howev...

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Problems solved by technology

[0003] However, most of the traditional STAP methods adopt the method of uniform emission. However, for the method of uniform pulse emission, it has some inherent defects: (1) causing distance and Doppler ambiguity; (2) limiting the ability to resist electronic interference ; (3) lead to a higher sampling rate

As for the method of non-uniform pulse transmission, such as transmitting non-uniform pulses with random PRI, however, random PRI cannot achieve true randomness in actual radar systems, so there will be certain limitations in the actual application process

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