CN-120983017-B - Gesture mode switching method and system for radar body detector

CN120983017BCN 120983017 BCN120983017 BCN 120983017BCN-120983017-B

Abstract

The invention relates to the technical field of radar body detectors, and particularly discloses a method and a system for switching gesture modes of a radar body detector, wherein the method comprises the steps of acquiring radar echo signals and extracting motion parameter information of a user according to the radar echo signals; the method comprises the steps of generating a motion state index sequence according to motion parameter information, analyzing the motion state index sequence, detecting a signal segment with the similarity to a radar characteristic mode of a preset gesture being larger than a first preset threshold value, marking the signal segment as a potential gesture signal, analyzing the potential gesture signal based on context intention judgment to obtain an intention judgment score, judging whether the potential gesture signal is a mode switching instruction or not, effectively distinguishing the mode switching instruction consciously and the unintentional background motion of a user, adapting to gesture variation caused by the position and gesture change of the user, and achieving the effects of obviously reducing misjudgment rate and improving gesture interaction accuracy and reliability.

Inventors

MEI ZHENFENG
He Mengrui
Yin Benheng
YE YING

Assignees

江苏珈菲科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250818

Claims (9)

1. A method for switching gesture modes of a radar body detector, which is used for judging whether a gesture of a user is a mode switching instruction, and is characterized by comprising the following steps: s1, acquiring a radar echo signal, and extracting motion parameter information of a user according to the radar echo signal; s2, generating a motion state index sequence of a first preset window length about time sequence arrangement according to the motion parameter information; s3, analyzing the motion state index sequence, detecting a signal segment with the similarity to the radar characteristic mode of the preset gesture being greater than a first preset threshold value, and marking the signal segment as a potential gesture signal; s4, analyzing the potential gesture signals based on the context intention judgment to obtain intention judgment scores; S5, judging a score according to the intention, and judging whether the potential gesture signal is a mode switching instruction or not; the step S4 includes: s41, analyzing a motion state index before the potential gesture signal appears based on the motion state index sequence, and determining a pre-gesture intention score of the potential gesture signal; s42, analyzing the motion state indexes of the potential gesture signals after execution based on the motion state index sequence, and determining the post gesture intention scores of the potential gesture signals; S43, extracting action features of the potential gesture signals, comparing the action features with preset intentional gesture feature modes and unintentional background motion feature modes, and determining gesture matching intention scores of the potential gesture signals; S44, calculating and obtaining the intention judgment score according to the pre-gesture intention score, the post-gesture intention score and the gesture matching intention score; Step S41 includes: S411, based on the motion state index sequence, acquiring the statistical characteristics of the motion state indexes of the signal segments before the occurrence of the potential gesture signals, and based on the statistical characteristics and a preset statistical threshold, calculating the stability degree before the occurrence of the potential gesture signals; s412, calculating the pre-gesture intention score based on the stability degree before the potential gesture signal appears.
2. The method for switching gesture modes of a radar body detector according to claim 1, wherein step S1 includes: s11, acquiring radar echo signals; s12, performing multi-target separation processing on the radar echo signals to obtain target echo signals of a plurality of moving targets; S13, filtering the target echo signal to filter interference signals with similarity to a preset non-user motion characteristic mode being greater than a second preset threshold value; s14, extracting the motion parameter information according to the target echo signal after the filtering processing.
3. The method for switching gesture modes of a radar body detector according to claim 2, wherein step S13 includes: S131, extracting motion characteristic parameters according to the target echo signals; S132, comparing the motion characteristic parameter with a preset non-user motion characteristic mode, and determining the similarity of the target echo signal and the non-user motion characteristic mode; S133, judging whether the similarity is larger than the second preset threshold value, and if so, judging the target echo signal as an interference signal and filtering the interference signal.
4. The method for switching gesture modes of a radar body detector according to claim 1, wherein step S2 includes: S21, performing time domain smoothing on the motion parameter information to obtain a motion parameter information sequence with the time length being the first preset window length after the time domain smoothing; S22, splitting and recombining the motion parameter information sequence into a plurality of motion parameter segments based on a second preset window length; s23, extracting features of each motion parameter segment to obtain one or more of overall motion energy, limb motion amplitude, position change rate and motion track dispersion of a user as motion state indexes; S24, arranging the motion state indexes in time sequence to generate the motion state index sequence.
5. The method for switching gesture modes of a radar body detector according to claim 1, wherein step S3 includes: s31, intercepting the motion state index sequence based on a third preset window length to obtain a plurality of signal segments; S32, extracting the variation trend and the statistical characteristics of the motion state indexes of each signal segment; S33, comparing radar feature modes of preset gestures based on the change trend and the statistical features to obtain similarity scores; S34, judging whether the similarity score of each signal segment is larger than a first preset threshold value; S35, marking the signal segment with the similarity score larger than the first preset threshold value as the potential gesture signal.
6. The method for switching gesture modes of a radar body detector according to claim 5, wherein the radar feature mode includes a plurality of reference vectors representing different gestures and composed of a reference variation trend and a reference statistical feature, and step S33 includes: s331, constructing a multidimensional vector based on the variation trend and the statistical characteristics of the motion state indexes of each signal segment; s332, calculating and acquiring an initial similarity score based on the space distance between the multidimensional vector of each signal segment and each reference vector of the radar feature mode; s333, screening and obtaining the maximum similarity score corresponding to each signal segment as the similarity score.
7. The method for switching gesture modes of a radar body detector according to claim 1, wherein step S43 includes: S431, extracting action characteristics of the potential gesture signals; S432, comparing the action characteristic with a preset intentional gesture characteristic mode to obtain a first similarity, wherein the first similarity is the similarity between the potential gesture signal and the intentional gesture characteristic mode; S433, comparing the action characteristic with a preset unconscious background motion characteristic mode to obtain a second similarity, wherein the second similarity is the similarity between the potential gesture signal and the unconscious background motion characteristic mode; S434, calculating the gesture matching intention score according to the first similarity and the second similarity.
8. The method for switching gesture modes of a radar body detector according to claim 1, wherein step S5 includes: s51, comparing the intention judgment score with a preset instruction confirmation threshold to determine whether the potential gesture signal meets the condition of a mode switching instruction; and S52, if the potential gesture signal meets the condition of the mode switching instruction, determining the potential gesture signal as the mode switching instruction, and executing corresponding mode switching operation.
9. A radar body detector gesture mode switching system for determining whether a user gesture is a mode switching instruction, for performing the radar body detector gesture mode switching method according to any one of claims 1 to 8, the system comprising: The acquisition module is used for acquiring radar echo signals and extracting motion parameter information of a user according to the radar echo signals; The sequence generation module is used for generating a motion state index sequence of a first preset window length which is arranged in a time sequence mode according to the motion parameter information; the sequence analysis module is used for analyzing the motion state index sequence, detecting a signal segment with the similarity to the radar characteristic mode of the preset gesture being greater than a first preset threshold value, and marking the signal segment as a potential gesture signal; The intention integration module is used for analyzing the potential gesture signals based on the context intention judgment to obtain an intention judgment score; and the intention judging module is used for judging the score according to the intention and judging whether the potential gesture signal is a mode switching instruction or not.

Description

Gesture mode switching method and system for radar body detector Technical Field The application relates to the technical field of radar body detectors, in particular to a gesture mode switching method and system of a radar body detector. Background A radar body detector (also called a radar body detector) is used as an advanced health maintenance device, and provides noninductive and continuous vital sign and activity state monitoring in a daily environment of a user through a fixed installation mode. The equipment is generally deployed at a specific position of a bedroom or a living room, and the millimeter wave radar module is used for transmitting and receiving echo signals so as to realize real-time monitoring of indexes such as heart rate, respiration, sleep quality, falling and the like. Meanwhile, the technology supports a gesture recognition function, allows a user to execute a mode switching instruction through simple actions, such as suspending monitoring or switching to an active mode, so that interaction convenience is improved. The intelligent monitoring scheme is pushing the health management field to develop towards the non-contact and automatic directions, meets the requirements of users on efficient and comfortable health services, and shows wide market application prospects. However, in a health care scenario, the user's activity position and posture has a high degree of uncertainty, and the user may be active in different areas within the room, such as bedside, in front of a desk, or in the center of the room. When a user executes a preset gesture instruction at a non-ideal position, a radar echo signal is obviously changed due to distance, angle, direction or partial shielding, so that the difference between gesture characteristics and a standard model is large, and the existing recognition algorithm is difficult to accurately match with a variant gesture action. In addition, the device captures various non-commanded physical activities during continuous monitoring, such as turning over during sleep, stretching a limb while awake, or scratching the body, which may have occasional similarities to preset gesture commands. Because the existing system lacks a depth judgment mechanism for the intention of the user, background movement and real instructions cannot be effectively distinguished, misjudgment is extremely easy to be caused, for example, unintentional actions are identified as mode switching instructions, and monitoring is interrupted or switching to an unsuitable mode is carried out accidentally. These problems reduce the accuracy and reliability of gesture interaction, affect the user experience and health monitoring continuity, and limit the practical application effect of the contactless interaction technology. In view of the above problems, no effective technical solution is currently available. Disclosure of Invention The application aims to provide a method and a system for switching gesture modes of a radar body detector, which are used for distinguishing conscious instructive gestures and unconscious background movements of a user, reducing the misjudgment rate of gesture recognition, improving the accuracy and reliability of gesture interaction, improving user experience and guaranteeing the continuity of health monitoring. In a first aspect, the present application provides a method for switching gesture modes of a radar body detector, for judging whether a gesture of a user is a mode switching instruction, wherein the method includes the following steps: s1, acquiring a radar echo signal, and extracting motion parameter information of a user according to the radar echo signal; s2, generating a motion state index sequence of a first preset window length about time sequence arrangement according to the motion parameter information; s3, analyzing the motion state index sequence, detecting a signal segment with the similarity to the radar characteristic mode of the preset gesture being greater than a first preset threshold value, and marking the signal segment as a potential gesture signal; s4, analyzing the potential gesture signals based on the context intention judgment to obtain intention judgment scores; S5, judging whether the potential gesture signal is a mode switching instruction or not according to the intention judgment score. The gesture mode switching method of the radar body detector, wherein, step S1 includes: s11, acquiring radar echo signals; s12, performing multi-target separation processing on the radar echo signals to obtain target echo signals of a plurality of moving targets; S13, filtering the target echo signal to filter interference signals with similarity to a preset non-user motion characteristic mode being greater than a second preset threshold value; s14, extracting the motion parameter information according to the target echo signal after the filtering processing. The gesture mode switching method of the radar body detector, wherein, step S13