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公开(公告)号：WO2022123190A1
公开(公告)日：2022-06-16
申请号：PCT/GB2020/053134
申请日：2020-12-07
Applicant: KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY [AE]/[AE] , BRITISH TELECOMMUNICATIONS PLC [GB]/[GB] , EMIRATES TELECOMMUNICATIONS CORPORATION [AE]/[AE]
Inventor： AWEYA, James , ALMOOSA, Nawaf
Abstract: This invention relates to methods and systems for determining whether a reference point in a location system has changed used measurement residuals determined from an exchange of messages between reference points. In one embodiment a method of determining whether the location of a first one of a plurality of reference points used in a location system has changed is provided. The reference points each have a known initial position and the method includes the steps of: sending a wireless message between a second reference point and the first reference point and recording the times of sending and receipt of the wireless message; estimating from the recorded times, an estimated distance between the first reference point and the second reference point; comparing the estimated distance to the actual distance between the known initial positions of the first and second reference points to determine a measurement residual; and determining, using the measurement residual, whether the location of the first reference point has changed.
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公开(公告)号：WO2022123191A1
公开(公告)日：2022-06-16
申请号：PCT/GB2020/053135
申请日：2020-12-07
Applicant: KHALIFA UNIVERSITY OF SCIENCE AND TECHNOLOGY [AE]/[AE] , BRITISH TELECOMMUNICATIONS PLC [GB]/[GB] , EMIRATES TELECOMMUNICATIONS CORPORATION [AE]/[AE]
Inventor： AWEYA, James , ALMOOSA, Nawaf
Abstract: This invention relates to methods and systems for determining whether a reference point in a location system has changed using the entropy of channel impulse responses. In one embodiment a method of determining whether the location of a first one of a plurality of reference points used in a location system has changed is provided. The reference points each have a known initial position and the method includes the steps of: estimating a channel impulse response of a wireless channel between the first reference point and a second of said plurality of reference points; determining the difference between the estimated channel impulse response and a previously-estimated channel impulse response of the wireless channel; estimating an entropy of the difference between the channel impulse responses; and determining, from said comparison, whether the location of the first reference point has changed. In another embodiment the method includes the steps of: estimating an entropy of the channel impulse response of a wireless channel between the first reference point and a second of said plurality of reference points; comparing the estimated entropy to a previously-estimated entropy for the channel impulse response of the wireless channel; determining, from said comparison, whether the location of the first reference point has changed.
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