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Power free radio monitor system and subbase station for the system

A monitoring system, technology without power supply, applied in the direction of diversity/multi-antenna system, transmission system, radio/inductive link selection arrangement, etc., can solve the problems of indeterminable device location, large size, etc.

Inactive Publication Date: 2007-10-03
HITACHI CABLE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, the technology described in Non-Patent Document 1 has the following three problems: 1) the location of the device cannot be determined because the device is installed in a forest, and 2) the method for dynamically changing the direction of electromagnetic waves emitted by the device Complicated processing, the antenna of the device is essentially three antennas for signal transmission, signal reception, and power acquisition, and the size of the entire device becomes larger. electricity

Method used

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  • Power free radio monitor system and subbase station for the system
  • Power free radio monitor system and subbase station for the system
  • Power free radio monitor system and subbase station for the system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0058] (Structure of wireless monitoring system without power supply)

[0059] FIG. 1 is a schematic diagram showing the configuration of a power-free wireless monitoring system according to a first embodiment of the present invention. In the wireless monitoring system without power supply according to the present embodiment, power transmission and communication are performed between main base station (BS) 1 and sub base station (CS) 10 .

[0060] (Structure of main base station)

[0061] The master base station 1 includes a master base station transmitting antenna 2 as a circularly polarized antenna, and a master base station receiving antenna 3 as a circularly polarizing antenna having a polarization characteristic reversed to that of the master base station transmitting antenna 2 .

[0062] (Operation of main base station)

[0063] In the downlink radio wave 4 from the main base station 1 to the sub-base station 10, the non-modulated carrier wave (circular polarized wave)...

no. 2 approach

[0088] (Structure of sub base station)

[0089] FIG. 2 is a schematic diagram showing the configuration of a sub base station of a wireless monitoring system without power supply according to a second embodiment of the present invention. Except for the configuration and operation of the sub-base station described below, it is the same as the passive wireless monitoring system of the first embodiment.

[0090] The sub-base station 20 of this embodiment includes: a sub-base station reception antenna 11 as a balanced circularly polarized wave antenna, and a sub-base station transmission antenna as a circularly polarized wave antenna having a polarization characteristic reversed to that of the sub-base station reception antenna 11. Antenna 12, baseband circuit (BB) 13, modulator (MOD) 14, demodulator (DEMOD) 15, smoothing circuit 16, carrier frequency bandpass filter 17 for power supply, intermediate frequency bandpass filter 18, balanced Balanced two-line conversion circuit 21, ...

no. 3 approach

[0097] (Structure of sub base station)

[0098] Fig. 3 is a schematic diagram showing the configuration of a sub-base station of a passive wireless monitoring system according to a third embodiment of the present invention. Descriptions of the same parts as those in the various embodiments of the present invention described above are omitted.

[0099] The sub base station 30 of this embodiment differs from the second embodiment in that a carrier frequency band rejection filter 31 for power supply is inserted between the intermediate frequency band pass filter 18 and the second synthesis circuit 23 .

[0100] In order to prevent the high-frequency signal (the carrier wave for power supply and the carrier wave for signal transmission) from passing through the demodulator 15, a carrier frequency band-stop filter 31 for power supply is provided before the intermediate frequency band-pass filter 18 provided. This is to send only the component of the carrier wave for signal transmi...

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PUM

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Abstract

The invention provides a method to monitor or investigate a running state of each device in the infrastructure facilities in the human uncome-at-able circumstance at high reliability to easure a distance from bad influence, or state of circumstance of placing device, no need of power supply of cell. A wireless monitoring system uses no-modulated carrrier wave of circularly polarized wave for electric power supply in the same frequency band at down line 4 and modulated carrrier wave of circularly polarized wave for signal transmission, and uses no-modulated carrrier wave of circularly polarized wave for electric power supply and modulated carrrier wave of circularly polarized wave for signal transmissionin of reverse polarized wave of the same frequency band at up line 5, subbase station 10 comprising subbase station receiving antenna 11 of balanced type and non-linear line 19 for commutating and frequency mixing at the same time.

Description

technical field [0001] The present invention relates to a method that can remotely monitor such as high places, areas full of high-concentration harmful chemicals, radiation treatment areas, high-power passing areas, high-temperature areas, high-pressure areas, areas that should maintain a high-purity hygienic environment, etc. due to safety and health The above reasons are not suitable for monitoring or investigating the state of the area where people (creatures) directly approach the wireless monitoring system, especially after setting up a device (sub-base station) that can perform such monitoring or investigation, no need Regular replacement of power generation units such as primary batteries in the device can ensure the reliability of the device without a power supply wireless monitoring system and the sub-base station used in the system. Background technique [0002] Social infrastructure systems such as electricity, tap water, and communications are becoming more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/34H04B17/00
CPCH04B7/10
Inventor 武井健
Owner HITACHI CABLE LTD
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