rssi ranging and positioning method based on bluetooth signal
A positioning method and technology of bluetooth signal, applied in the directions of location information-based services, wireless communication, electrical components, etc., can solve the problems of inaccurate distance value, small-scale fading jitter, inaccurate positioning, etc., to achieve the positioning effect Good, eliminate serious jitter, accurate positioning effect
Active Publication Date: 2018-08-10
CHENGDU SIHAN TECH
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[0009] Although this method of distance measurement based on large-scale fading can calculate the distance between the signal receiving end and the signal transmitting end, due to the randomness of the channel and the scene to be considered is a moving object scene, that is, usually In some cases, one end of the receiving end or the transmitting end is moving, so the inevitable small-scale fading Small-scale fading will bring a lot of jitter, which will lead to inaccurate positioning. At the same time, the traditional free space model is not suitable for mobile application scenarios. Completely matched, the distance value obtained by distance measurement based on large-scale fading is not accurate enough, so the positioning is not accurate
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[0042]The RSSI ranging and positioning method based on bluetooth signals of the present invention comprises the following steps: first, the bluetooth transmitting end continuously transmits signals, and the mobile receiving end entering its coverage area continuously obtains the RSSI values at n times, and then the obtained first RSSI value Y at time i i Perform Gaussian filtering to get i=0,1...n-1; for the received RSSI value Y at the i-th moment i The specific process of Gaussian filter processing is as follows: the Y i Enter the following formula to obtain The formula is as follows:
[0043]
[0044]
[0045] Further, in order to ensure the filtering effect, the N is preferably 5;
[0046] Since Gaussian filtering has a very serious overfitting problem, another filter is used to eliminate this overfitting problem; Perform Savitzky-Golay filtering to get Using the Savitzky-Golay filter can eliminate the above-mentioned overfitting problem, the Perform Sa...
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The invention discloses a RSSI range-based localization method based on Bluetooth signals, wherein the method is accurate in localization. According to the RSSI range-based localization method based on Bluetooth signals, the received RSSI values are subjected to Gaussian filtering processing and Savitzky-Golay filtering processing, thus, the problem of serious jittering of the RSSI values can be eliminated, smooth and continuous RSSI values are obtained, then, the smooth and continuous RSSI values are put in a distance estimation formula provided by the invention, and consequently, distance between a signal receiving end and a signal transmitting end can be calculated. Experiments prove that the distance between the signal receiving end and the signal transmitting end obtained through the method has smaller degree of deviation from the real distance, and the method is accurate in localization and has better localization effect. The method is suitable for popularization and application in the technical field of localization.
Description
technical field [0001] The invention relates to the technical field of positioning, in particular to an RSSI ranging and positioning method based on bluetooth signals. Background technique [0002] RSSI (Received Signal Strength Indication) refers to the received signal strength indication, a positioning technology that measures the distance between the signal point and the receiving point through the strength of the received signal, and then performs positioning calculations based on the corresponding data [0003] At present, according to the received RSSI value, the distance between the signal receiving end and the signal transmitting end is usually calculated using the following traditional method, that is, the distance is fitted by using the large-scale fading of the signal in space. From the theory and actual measurement, if the free space model is adopted, the average received signal power RSSI value decreases logarithmically with the increase of the distance. The fr...
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IPC IPC(8): H04W4/02H04W64/00
CPCH04W4/02H04W64/00
Inventor 席正付磊
Owner CHENGDU SIHAN TECH