Method of estimating direction of arrival (DOA) based on linear frequency modulation signal
A technology of direction of arrival estimation and chirp signal, which is applied to radio wave measurement systems, direction-determining directional devices, measurement devices, etc., and can solve the problems of low accuracy of estimated angle, high cost, and large number of antennas.
Active Publication Date: 2017-07-14
HANGZHOU DIANZI UNIV
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[0005] In order to overcome the shortcomings of the existing AOA estimation technology, such as low estimation angle accuracy, large errors in multipath effects, large number of antennas and high cost, the present invention discloses a method for estimating direction of arrival based on chirp signals
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[0060] The present invention will be described in more detail and completeness below in conjunction with the accompanying drawings and specific implementation cases. It is stated here that the described specific implementation cases are only used for an explanation of the present invention, and are not intended to limit the present invention. In addition, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings but not the whole content.
[0061] The present invention designs a method for estimating the direction of arrival based on a linear frequency modulation signal. Two antennas transmit LFM signals at the same time. Focus on sampling within the range to further eliminate the impact of multipath effects on the system and improve the accuracy of AOA estimation. The purpose of the present invention is to overcome the shortcomings of the existing AOA estimation technology in the multipath environment...
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The invention discloses a method of estimating the direction of arrival (DOA) based on a linear frequency modulation signal. A distance between two antennas installed at an anchor node is d, and the two antennas are controlled by the same oscillator to simultaneously transmit LFM signals with different initial frequencies and the same frequency modulation rate; a tag node performs A / D sampling on received signals by the antennas, performs down-conversion processing of the signals and then performs NDFT, direct signals arriving at the tag node via the two antennas in a line-of-sight environment produce a delay difference, and a periodical estimated AOA of the signals is estimated after the NDFT; and in the presence of a multipath effect, the direct signals arriving at the tag node via the two antennas has different delays, the received signal period corresponding to the delay difference of the direct signals is obtained, the multi-point NDFT is performed at the frequency point of interest to find the frequency corresponding to the maximum peak, and the signal AOA is estimated. The method of the invention has the advantages of anti-multipath effect, high dynamic property, high precision, low hardware complexity, and so forth.
Description
technical field [0001] The invention belongs to the field of wireless sensor technology and electronic communication system, and relates to a direction-of-arrival estimation method based on linear frequency modulation signals. Background technique [0002] Realizing the positioning of the target by measuring the angle of arrival (AOA) of the RF (radio frequency) signal is a working method often used by the RF positioning system. In recent years, with the popularization of wireless networks and the development of indoor positioning technology, Location Based Service (LBS) has received more and more attention; for example, in the fields of emergency assistance, medical care, and personalized information transmission Shows great vitality. The purpose of wireless sensor network node positioning is to measure relevant parameters of received radio waves, such as time of arrival (TOA), time difference of arrival (TDOA), angle of arrival (AOA) or signal field strength (RSS), etc. ...
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IPC IPC(8): G01S3/50
CPCG01S3/50
Inventor 刘参尚俊娜沈周青黄金鹏岳克强
Owner HANGZHOU DIANZI UNIV