Method and device for localizing the position of at least two emission units, especially for monitoring at least one parameter for a plurality of wheels pertaining to a motor vehicle
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Accused Products
Abstract
The invention relates to a method and a device for localising the position of at least two emission units, especially for monitoring at least one parameter for a plurality of wheels pertaining to a motor vehicle. The average power of the reception signals of a central evaluation and control unit (5) is detected. The aim of the invention is to improve the reliability of a correct localisation. To this end, at least two association criteria are used to associate the reception signals or emission units with positions or regions, when the examination of a reliability criterion for the first association criterion does not produce a sufficiently high reliability for the association carried out.
17 Citations
28 Claims
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1-10. -10. (canceled)
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11. A method of localizing a position of at least two emission units, which comprises:
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(a) assigning a portion N of the emission units to a first transmitter group and assigning another portion M of the emission units to a second transmitter group, and assigning a local region to each transmitter group;
(b) detecting transmission signals emitted by the emission units with a receiver antenna of a receiver unit of an evaluation and control unit;
(c) wherein a reception power of the reception signals from the emission units of the first transmitter group is in each case appreciably higher than a reception power of the reception signals from the emission units of the second transmitter group over a long time span in each case;
(d) averaging the reception power of at least two reception signals over a predetermined time span or a predetermined number of discretely scanned values of the reception power or over a predetermined number of intermittently transmitted signals;
(e) allocating N reception signals with N highest average values or the respective emission units to the first transmitter group, and allocating M reception signals with M lowest average values or the respective emission units to the second transmitter group;
(f) determining the reception signal of the first transmitter group with a smallest average value and the reception signal of the second transmitter group with a highest average value, and comparing a difference in amount of the smallest and highest average values or a ratio thereof with a predetermined reliability threshold value;
(g) accepting the allocation of the reception signals or the respective emission units of the first or second transmitter groups or the local regions allocated thereto as being correct only if the difference in amount or the ratio of the average values is greater than the reliability threshold value; and
(h) if the difference in amount or the ratio of the average value is less than the reliability threshold value, using at least one additional decision criterion for allocating the reception signals or the respective emission units to the transmitter groups or the local regions thereof, and/or an additional criterion for testing a reliability of a correct allocation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 27)
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23. A device for localizing the positions of at least two emission units, comprising:
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(a) a plurality of emission units including a portion N of said emission units assigned to a first transmitter group and a portion M of said emission units assigned to a second transmitter group, each transmitter group having a local region assigned thereto;
(b) an evaluation and control unit having a receiver unit and a receiving antenna for detecting signals transmitted by said emission units;
(c) wherein a reception power of the reception signals from said emitters of said first transmitter group is in each case sufficiently higher than a reception power of the reception signals from said emitters of said second transmitter group over a long time span in each case;
(d) said evaluation and control unit being configured to detect and average the reception power of at least two reception signals over a predetermined time span or to in each case discretely scan and average a predetermined number of values of the reception power of the reception signals or in each case to detect and average a predetermined number of signals sent intermittently;
(e) said evaluation and control unit allocating N reception signals with the N highest average values, and the respective said emission units, to said first transmitter group, and allocating M reception signals with the M lowest average values, and the respective said emission units, to said second transmitter group;
(f) said evaluation and control unit determining the reception signal of said first transmitter group with the lowest average value and the reception signal of said second transmitter group with the highest average value and comparing a difference in amount of the average values, or a ratio of the average values, with a predetermined reliability threshold value;
(g) said evaluation and control unit accepting an allocation of the reception signals, or the respective said emission units, to the first or the second transmitter group or to the locally allocated regions to be correct only if the difference in amount or the ratio of the average values is greater than the reliability threshold value; and
(h) said evaluation and control unit, if the difference in amount or the ratio of the average value is less than the reliability threshold value, utilizing at least one additional decision criterion for allocating the reception signals, or the respective said emission units to the transmitter groups or the local regions, and/or utilizing an additional criterion for testing the reliability of a correct allocation. - View Dependent Claims (24, 25, 26, 28)
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Specification