Terminal location estimation system, terminal location estimation device, terminal location estimation method, and control program
A terminal position and estimation part technology, applied in transmission system, measurement device, radio wave measurement system, etc., can solve the problem of the reduction of the accuracy of electronic keys
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Embodiment approach 1
[0027] (Configuration of terminal position estimation system)
[0028] Such as figure 1 As shown, a terminal position estimating system 1 includes a communication terminal 2 and a vehicle-side unit 3 used in a vehicle. The communication terminal 2 and the vehicle-side unit 3 can transmit and receive signals by carrying radio waves through wireless communication, respectively. In addition, when the communication terminal 2 and the vehicle-side unit 3 exist within the communication range of each other, one of them receives a signal transmitted by the other through wireless communication.
[0029] (Configuration of communication terminal)
[0030] Communication terminal 2 is carried, for example, by a user. Here, "carried by the user" is not limited to the state carried by the user, but also includes the state not carried by the user such as forgetting to carry it. Here, use figure 2 The communication terminal 2 will be described. Such as figure 2 As shown, the communica...
Embodiment approach 2
[0093] In Embodiment 1, the configuration of calculating the residual by the least square method was shown, but it is not necessarily limited to this. In Embodiment 2, for example, the formula for calculating the residual may be weighted according to the strength of the received magnetic field to calculate the residual, in other words, the residual may be calculated by the weighted least square method. As an example of weighting, an example represented by the following formula 10 is given. AB 1 ~AB 3 is a coefficient corresponding to the strength of the received magnetic field. In other words, each LF transmission antenna 31 is multiplied by the square value of the error of the magnetic field intensity obtained by using the approximate expression of Equation 2 for a plurality of assumed candidate positions and the received magnetic field intensity acquired by the response acquisition section 302 by each The values obtained by the coefficients of the LF transmitting antenn...
Embodiment approach 3
[0099] In Embodiment 1, a configuration is shown in which a plurality of candidate positions are assumed as initial candidate positions at intervals thicker than the required estimation accuracy of the terminal position. In Embodiment 3, a plurality of candidate positions may be assumed as initial candidate positions in order to narrow down to the periphery of the terminal position approximately determined using Newton's method.
[0100] The terminal position estimating unit 303 approximates the magnetic field intensity distribution of each LF transmitting antenna 31 to a circle, and then calculates the distance between each LF transmitting antenna 31 and the communication terminal from the receiving magnetic field intensity of each LF transmitting antenna 31 acquired by the response acquiring unit 302 . 2 distance. Here, the magnetic field intensity distribution of LF transmitting antenna 31 may refer to the relationship inversely proportional to the cube of the distance from...
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