A method for human positioning and tracking with dual-frequency continuous wave radar applied indoors

Abstract

The invention discloses an indoor-used dual-frequency continuous wave radar human body locating and tracking method comprising the steps that signal Doppler frequency shift caused by human body movement is acquired by performing mixed frequency filtering on receiving and transmitting signals, and peak detection is performed on frequency shift signals; speed difference signals of the areas near the peak are extracted according to a local speed difference compensation algorithm to be matched with a compensation template so that the optimal matching terms are acquired and the original signals are calibrated; phase comparison operation is performed on two paths of continuous wave signals by using a dual-frequency phase comparison mechanism so that movement human body distance information is acquired; and real-time trace tracking of the movement human body is performed through the human body movement speed vectors with combination of a blind point correction model. Compared with the existing indoor-used human body locating radar technology, dual-frequency continuous wave radar is enabled to realize high-precision human body locating through low bandwidth by the local speed difference compensation algorithm, and the algorithm complexity is low so as to be more suitable for real-time trace tracking.

Description

technical field [0001] The invention belongs to the field of wireless communication, and more specifically relates to an indoor dual-frequency continuous wave radar human body positioning and tracking method. Background technique [0002] With the development of wireless signals, location-based services (Location Based Service, referred to as LBS) have been widely used, and mobile positioning as the main technology has received extensive attention. There are endless positioning awareness technologies in the positioning process, mainly including: radio frequency identification technology, bluetooth technology, ultrasonic positioning perception, WIFI, etc. Mainly through the strength of the received signal combined with the indoor propagation model, the received signal strength (Received Signal Strength, referred to as RSS) is converted into a distance to determine the distance, so the requirements for the indoor environment are high, and the reflection of multiple objects wil...

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Problems solved by technology

[0004] However, the existing non-modulated continuous wave radar also has some problems: First, due to the interference of background objects and the non-uniform motion of the human body, the interference frequency shift will often occur due to the moving human body, and the resulting interference frequency shift will cause spectrum The broadening of the received signal will first lead to a decrease in the signal-to-noise ratio of the received signal, which will directly affect the ranging accuracy according to the radar accuracy formula; secondly, since the dual-frequency ranging is measured by the peak detection method, the broadening of the spectrum will reduce the peak value of the spectrum and increase In the case of high interference speed energy, it may even cause peak misjudgment and affect the speed measurement accuracy; finally, due to spectrum broadening, the peak signal of a single signal will have different degrees of phase shift, resulting in a decrease in positioning accuracy

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