A method of rssi distance measurement and positioning based on bluetooth signal
A positioning method and Bluetooth signal technology, applied in wireless communication, short-distance communication services, electrical components, etc., can solve problems such as inaccurate positioning, inaccurate distance values, small-scale fading and small-scale fading jitter, etc., to achieve accurate positioning, The positioning effect is good, and the effect of eliminating severe jitter
Active Publication Date: 2018-10-26
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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[0037] 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 i , the formula is as follows:
[0038]
[0039] in, α is the derivative of the standard deviation of the Gaussian random number, and N is a constant;
[0040] Further, in order to ensure the filtering effect, the N is preferably 5;
[0041] Since Gaussian filtering has a very serious overfitting problem, another filter is used to eliminate this overfitting problem; Perform Savitzky-Golay filtering to g...
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The invention discloses a Bluetooth signal-based RSSI (Received Signal Strength Indication) ranging-based finding positioning method. The Bluetooth signal-based RSSI ranging-based finding positioning method comprises steps of subjecting a received RSSI value to Gaussian filtering treatment and Savitzky-Golay filtering treatment, in order to solve the problem that the RSSI value varies severely and to obtain a smooth and continuous RSSI value; and putting the RSSI value into a distance estimation formula provided by the invention to obtain a distance between a signal reception end and a signal emission end by calculation. The experiment indicates that deviation between the distance between the signal reception end and the signal emission end obtained by the method and a real distance is small, the positioning is accurate, and the positioning effect is good. The method is suitable for popularization and application in the positioning technology field.
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): H04W4/80H04W64/00
CPCH04W64/00
Inventor 席正付磊
Owner CHENGDU SIHAN TECH