DOA estimation system and estimation method based on software radio equipment

Abstract

The invention belongs to the technical field, and particularly relates to a DOA estimation system and an estimation method based on software radio equipment. The system comprises a clock source, at least one signal source, at least four pieces of software radio equipment, a uniform linear array and a processor, wherein the uniform linear array comprises at least four array elements; each array element is arranged at a receiving end on the software radio equipment and is in communication connection with the corresponding software radio equipment through radio frequency lines with the same length; each signal source corresponds to at least four pieces of software radio equipment, the signal source is located on one side of the at least four pieces of software radio equipment, and the clock source is located on the other side of the at least four pieces of software radio equipment, is in communication connection with each piece of software radio equipment through a clock synchronization line and provides the same clock pulse signal; the at least four pieces of software radio equipment are in communication connection with the processor; and the processor is used for carrying out direction of arrival estimation on the calibrated receiving data matrix by adopting a MUSIC algorithm.

Description

technical field [0001] The invention belongs to the technical field of radiation source positioning and direction of arrival estimation, and in particular relates to a DOA estimation system and estimation method based on software radio equipment. Background technique [0002] DOA (direction of arrival, abbreviated as DOA) estimation is also called signal direction of arrival estimation, which is mainly to process the noise-containing signal data received by the space sensor array to obtain the direction information of the target. At present, DOA estimation has been applied to many fields such as wireless communication, navigation, speech processing, sonar, radar and radio astronomy. [0003] As an important part of array signal processing, there are many high-precision and low-computational-complexity algorithms for signal DOA estimation, such as multiple signal classification (MUSIC) algorithm, rotation invariant subspace (ESPRIT) algorithm, propagation operator (PM) algor...

AI Technical Summary

Problems solved by technology

The DOA estimation systems in these two documents both use two NI-USRPs to estimate a single radiation source, the angle estimation error is about 3°, and the estimation accuracy is limited

[0007] At present, the existing mainstream DOA system is a hardware system based on high-cost SDR such as NI-USRP. The system cost is high, the amount of calculation becomes larger, and there are high requirements for computer processors, and the mobility is not strong.

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