Transmission time sequence control method of ultra-wide band indoor positioning system
An indoor positioning and timing control technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of less timing control and in the initial stage, and achieve the effect of ensuring positioning accuracy
Inactive Publication Date: 2012-12-26
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Some universities and scientific research institutions have also carried out phased research work on ultra-wideband communication systems, but it is still in its infancy, especially in the research on timing control of base station transmission.
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[0027] The technical scheme and implementation steps adopted by the present invention to solve its technical problems are:
[0028] 1. Clock synchronization of four transmitters
[0029] The UWB wireless indoor positioning system consists of 4 fixed transmitters and a mobile receiver. The four transmitters in the system are located in the same room, distributed in fixed positions with a certain geometric shape and transmit certain ultra-wideband signals. The mobile receiving user obtains location information through certain location calculations. as attached figure 1 shown. Strict system clock synchronization must be maintained between the four transmitters. In order to make full use of the existing resources of the National Time Service Center and reduce the cost of additional development, it is proposed that:
[0030] Use the standard 10MHz frequency source signal provided by the National Timing Service Center (NTSC) as an external clock source, and then divide the 10M...
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The invention provides a transmission time sequence control method of an ultra-wide band indoor positioning system. According to the method, four fixed transmitting ends are arranged inside a room; frequency source signals of 10MHz are used as clock references of the four fixed transmitting ends and the frequency synthesis is carried out so as to generate desired clock frequency sources; a standard 1PPS (purse per second) signal is provided to be used as a trigger reference signal of a transmission initial time of each fixed transmitting end; the time delay of each fixed transmitting end is deducted respectively; and when the trigger reference signal is received, each fixed transmitting end is delayed for the same time one by one and starts to transmit the information content. With the adoption of the method, the clock synchronization of the whole indoor positioning system is ensured, the basis assurance to the final positioning precision is provided, and the problem that radio frequency ends are interfered mutually is avoided.
Description
technical field [0001] The invention is applicable to the timing control of the transmitter in the ultra-wideband positioning system, and is used to ensure the synchronization of time references between the transmitters and the realization of the time-division mode of the transmitter, and belongs to the cross technology of the radio technology field and the time-frequency technology field. Background technique [0002] There are many existing wireless positioning technologies and solutions, such as infrared rays, ultrasonic waves, and radio frequency signals. Infrared rays are suitable for short-distance transmission, and are easily interfered by fluorescent lamps or lights in the room, so they have limitations in precise positioning; ultrasonic waves are greatly affected by multipath effects and non-line-of-sight propagation, and cannot be used in indoor environments; radio frequency signals are generally used In outdoor positioning systems, there are limitations in applyin...
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IPC IPC(8): H04B1/7163H04L7/00
Inventor 卢晓春白燕饶永楠赵航邹德才王瑾
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI