CN102109935A - Infrared positioning system and method - Google Patents

Abstract

The invention discloses an infrared positioning system and an infrared positioning method. The infrared positioning system comprises a display area enclosed by a frame; the same side of the frame is provided with an infrared transmitter and two infrared receivers; the two infrared receivers are arranged on the two sides of the infrared transmitter; an identification signal generator marks the generated infrared light, the marked infrared light is sent out from the infrared transmitter, and is reflected by a baffle object, the time required when the two infrared receivers receive the marked infrared light is different, and the infrared light signals of the same pulse are compared, so that the coordinate of the baffle object is positioned, the structure of an electronic whiteboard is simple, the reliability is improved, cost is lowered and power consumption is saved.

Description

A kind of infrared location system and method

[technical field]

The present invention relates to a kind of infrared location technology, particularly a kind of infrared location system and method that is applied in the electronic whiteboard field.

[background technology]

The infrared positioning apparatus of existing electronic whiteboard is arranged on the blank periphery and forms a circle, upside and left side at blank are respectively arranged with infrared transmitter, downside and right side at blank are respectively arranged with infrared remote receiver, so just form the coordinate plane that vertical and horizontal intersect, scan successively and horizontal and vertically go up thereby whether the be blocked coordinate of location shelter of infrared light is arranged between infrared tube, this system realizes easily but the infrared transmitter and the receiver of use are too many, make complex structure, manufacture difficulty is big, the reliability of infrared location system is low, also caused simultaneously the financial cost height of infrared location system, price is high.

[summary of the invention]

The objective of the invention is in order to overcome the deficiencies in the prior art, provide a kind of infrared location system and method to make the simple in structure of electronic whiteboard, reliability improves, and has saved power consumption when reducing cost.

In order to achieve the above object, the present invention adopts following scheme:

A kind of infrared location system is characterized in that comprising framework, and described framework is surrounded by the viewing area, also comprises:

One infrared transmitter is used for the infrared light of emission band pulse labeling in the viewing area;

One id signal generator is used to produce different pulse signals and the infrared light of infrared transmitter emission is identified;

First infrared remote receiver and second infrared remote receiver are used to receive the infrared light that is shown shelter reflected back in the zone;

The locator data decipherer is handled the coordinate of location shelter thereby be used to gather the zero-time of infrared light of infrared transmitter emission band id signal and time of receiving the described infrared light that the is labeled line data of going forward side by side.

Be provided with an optical lens in the aforesaid infrared transmitter, be used to make infrared light in the viewing area, to cover with flat lamelliform.

Be respectively equipped with a filtering apparatus in aforesaid first infrared remote receiver and second infrared remote receiver, be used to filter infrared transmitter emission light in addition.

The id signal generator is that circulation produces different pulse signals as mentioned above.

Aforesaid infrared transmitter, first infrared remote receiver and second infrared remote receiver are arranged on the same side of framework, described first and second infrared remote receiver is separately positioned on the both sides of this infrared transmitter, be connected with the id signal generator on the described infrared transmitter, described locator data decipherer while and id signal generator, first, second infrared remote receiver is connected.

A kind of localization method according to described infrared location system is characterized in that may further comprise the steps:

Step 1: produce the pulse id signal, produce different pulse signals and send infrared transmitter to the id signal generator infrared light of emission is carried out mark, simultaneously this id signal is sent to locator data decipherer record infrared light emission zero-time and make the setting base parameter;

Step 2: the infrared light that emission is labeled, optical lens is placed infrared transmitter the place ahead, make it launch the flat thin layer infrared light that has the pulse id signal, described infrared photosphere covers in the viewing area with fan-shaped;

Step 3: receive the infrared light that has id signal of the thing reflection that is blocked, filtering apparatus is installed on first, second infrared remote receiver, make two infrared remote receivers receive the infrared light of the shelter reflected back in the viewing area respectively;

Step 4: the coordinate that calculates shelter, gather infrared signal and the writing time that first, second infrared remote receiver receives the tape pulse mark with the locator data decipherer, first, second infrared remote receiver is received the time of the infrared light that has identical pulse and time ratio that the id signal generator transmits same pulse signal, equal speed according to distance and multiply by the time, by calculating, thus the coordinate of location shelter.

Aforesaid id signal generator is that the infrared light that circulation generation pulse id signal is launched infrared transmitter carries out mark.

The present invention with respect to the beneficial effect of prior art is:

1, reduces the quantity of infrared transmitter and receiver, simplified the structure of infrared location system, reduced financial cost and system power dissipation;

2, the simplification of structure makes infrared location system more reliable and more stable, and easy for installation, suitable environment is wider.

[description of drawings]

Fig. 1 is the positional structure synoptic diagram of red transmitter, infrared remote receiver and shelter of the present invention;

Fig. 2 is a positioning system block diagram of the present invention.

[embodiment]

Below in conjunction with description of drawings and embodiment the present invention is further described:

As illustrated in fig. 1 and 2, a kind of infrared location system of the present invention, comprise framework 1, described framework 1 is surrounded by viewing area 4, on described framework 1, be provided with the infrared transmitter 2 that in viewing area 4, to launch infrared light, being provided with optical lens in the described infrared transmitter 2 can make infrared light cover in viewing area 4 with flat lamelliform, on described infrared transmitter 2, be connected with the different pulse signals of a generation capable of circulation carry out mark to the infrared light of infrared transmitter 2 emissions id signal generator 6, be respectively equipped with first infrared remote receiver 31 and second infrared remote receiver 32 in the both sides of described infrared transmitter 2, be used to receive the infrared light that is shown shelter 5 reflected backs in the zone 4, described first, second infrared remote receiver 31, be provided with filtering apparatus in 32 and can filter infrared transmitter 2 transmission frequencies light in addition, described two infrared remote receivers 31,31 all are connected with a locator data decipherer 7 with id signal generator 6, and described locator data decipherer 7 is gathered the zero-time and first that emission is labeled infrared light, second infrared remote receiver receives this time that is labeled infrared light line data of going forward side by side and handles the coordinate of location shelter 5.

As shown in Figure 2, described infrared transmitter 2 and first, second infrared remote receiver 31,32 are arranged on the same side frame 11 of framework 1, described frame 11 can be any side of framework 1, angle between the line of the line of described infrared transmitter 2 to first infrared remote receivers 31 and infrared transmitter 2 to second infrared remote receivers 32 is 150 degree to the maximum, minimum is 120 degree, with described two infrared remote receivers 31, the horizontal linear at 32 places is defined as X-axis, described first infrared remote receiver 31 to second infrared remote receiver, 32 directions for just, to be defined as Y-axis perpendicular to X-axis and the straight line by infrared transmitter 2, described infrared transmitter 2 to the direction of viewing area 4 for just, then first, two infrared remote receivers 31,32 coordinate just is (X ₀, 0) and (X ₀, 0), the coordinate of infrared transmitter 2 just be (0 ,-Y ₀), X wherein ₀With Y ₀Be positive number, these three coordinates are known, need the coordinate of the shelter 5 of location to be (X, Y).

Described frame 11 can be triangular in shape, and protrude outside framework 1 centre.

Described frame 11 can also be the rectangle of width greater than other frames.

Described framework 1 can be reduced to a frame that infrared location system is set.

As shown in Figure 1, can connect a processor controls 8 on the described locator data decipherer 7, can connect a projector 9 on the described processor controls 8, described processor controls 8 may command projector 9 projected spot on the coordinate of orienting, described processor controls 8 also can connect other display device or other operating equipment.

A kind of principle based on above-mentioned infrared location system of the present invention is as follows:

Start positioning system, the infrared light that id signal generator 6 begins to produce pulse signal and sends 2 pairs of emissions of infrared transmitter to carries out mark, send to locator data decipherer 7 records simultaneously and have the infrared photoemissive zero-time of this pulse id signal as the setting base parameter, described pulse signal can be the circulation from 1 pulse to 10 pulse, also can be the circulation from 1 pulse to 50 pulse or 100 pulses.

Infrared transmitter 2 is launched the flat thin layer infrared light that has the pulse id signal, this flat thin layer infrared light is realized by optical lens, described infrared photosphere covers in viewing area 4 with fan-shaped, described infrared photosphere has certain thickness, the infrared light that runs into shelter 5 can reflect, first, second infrared remote receiver 31,32 receives the infrared light that is reflected respectively, and described shelter 5 can be in viewing area 4 more arbitrarily.

The infrared signal of the tape pulse mark that first, second infrared remote receiver 31,32 of locator data decipherer 7 collections receives also writes down this time of reception, two infrared remote receivers 31,32 are received time ratio that time of the infrared signal that has identical pulse and id signal generator 6 transmit same pulse signal, the infrared light that obtains same pulse reflexes to the time T of first infrared remote receiver 31 from emission through shelter 5 ₁Time T with second infrared remote receiver 32 ₂, known infrared light velocity C, just can obtain infrared light from infrared transmitter 2 through the distance L of shelter 5 to first, second infrared remote receiver 31,32 ₀+ L ₁And L ₀+ L ₂, the utilization Pythagorean theorem can locate shelter 5 coordinate (X, Y).Its computing formula is as follows:

L ₀+L ₁＝C×T ₁

L ₀+L ₂＝C×T ₂

$L_0=\sqrt{X^2+{(Y+Y_0)}^2}$

${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\sqrt{{(X_0+X)}^2+{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2}$

${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">L</figure-callout>}}_2=\sqrt{{(X_0-X)}^2+{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2}$

By on can obtain a binary quadratic equation group:

$C\&times;{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">T</figure-callout>}}_1=\sqrt{X^2+{(Y+Y_0)}^2}+\sqrt{{(X_0+X)}^2+{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2}$

$C\&times;{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">T</figure-callout>}}_2=\sqrt{X^2+{(Y+Y_0)}^2}+\sqrt{{(X_0-X)}^2+{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000052831340000021.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2}$

Since C, T ₁, T ₂, X ₀, Y ₀Be known, then solve an equation the group can try to achieve shelter 5 coordinate (X, Y).

The step of a kind of infrared positioning method based on described infrared location system of the present invention comprises:

Step 1: produce the pulse id signal, the infrared light that produces pulse signals and send 2 pairs of emissions of infrared transmitter to id signal generator 6 carries out mark, simultaneously this id signal is sent to locator data decipherer 7 record infrared lights emission zero-times and makes the setting base parameter;

Step 2: the infrared light that is labeled of emission, make it launch the flat thin layer infrared light that has the pulse id signal before optical lens placed infrared transmitter 2, described infrared photosphere is with fan-shaped covering to viewing area 4 in;

Step 3: receive the infrared light that has id signal of thing 5 reflections that are blocked, filtering apparatus is installed on first, second infrared remote receiver 31,32, make two infrared remote receivers 31,32 receive the infrared light of shelter 5 reflected backs in the viewing area 4 respectively;

Step 4: the coordinate that calculates shelter 5, gather infrared signal and the writing time that first, second infrared remote receiver 31,32 receives the tape pulse mark with locator data decipherer 7, first, second infrared remote receiver 31,32 is received time ratio that time of the infrared light that has identical pulse and id signal generator 6 transmit same pulse signal, equal speed according to distance and multiply by the time, thus the coordinate of location shelter 5.Formula is identical described in the same positioning system principle of its computing formula.

Wherein said id signal generator 6 is that the different pulse of circulation generation is carried out mark to infrared light.

Locator data decipherer 7 sends the coordinate of locating to processor controls 8 and carries out subsequent action, processor controls 8 control projector 9 these coordinate points projected light classes on viewing area 4.

Claims (7)

1. infrared location system, it is characterized in that: comprise framework (1), described framework (1) is surrounded by viewing area (4), also comprises:

One infrared transmitter (2) is used for the infrared light of emission band pulse labeling in viewing area (4);

One id signal generator (6) is used to produce different pulse signals and the infrared light of infrared transmitter (2) emission is identified;

First infrared remote receiver (31) and second infrared remote receiver (32) are used for receiving the infrared light that is shown the interior shelter in zone (4) (5) reflected back;

Locator data decipherer (7) is used to gather infrared transmitter (2) coordinate that thereby the zero-time of the infrared light of emission band id signal and time of receiving the described infrared light that is labeled go forward side by side line data is handled location shelter (5).

2. a kind of infrared location system according to claim 1 is characterized in that being provided with an optical lens in the described infrared transmitter (2), is used to make infrared light to cover in viewing area (4) with flat lamelliform.

3. a kind of infrared location system according to claim 1 is characterized in that being respectively equipped with a filtering apparatus in described first infrared remote receiver (31) and second infrared remote receiver (32), is used to filter infrared transmitter (2) emission light in addition.

4. a kind of infrared location system according to claim 1 is characterized in that described id signal generator (6) is that circulation produces different pulse signals.

5. according to each described a kind of infrared location system among the claim 1-4, it is characterized in that described infrared transmitter (2), first infrared remote receiver (31) and second infrared remote receiver (32) are arranged on the same side of framework (1), described first, two infrared remote receivers (31), (32) be separately positioned on the both sides of this infrared transmitter (2), be connected with id signal generator (6) on the described infrared transmitter (2), described locator data decipherer (7) while and id signal generator (6), first, second infrared remote receiver (31), (32) be connected.

6. the localization method of an infrared location system according to claim 1 is characterized in that: may further comprise the steps:

Step 1: produce the pulse id signal, produce different pulse signals and send infrared transmitter (2) to id signal generator (6) infrared light of emission is carried out mark, simultaneously this id signal is sent to locator data decipherer (7) record infrared light emission zero-time and make the setting base parameter;

Step 2: the infrared light that emission is labeled, optical lens is placed infrared transmitter (2) the place ahead, make it launch the flat thin layer infrared light that has the pulse id signal, described infrared photosphere covers in viewing area (4) with fan-shaped;

Step 3: the infrared light that has id signal that receives thing (5) reflection that is blocked, filtering apparatus is installed on first, second infrared remote receiver (31), (32), makes two infrared remote receivers (31), (32) receive the infrared light of shelter (5) reflected back in the viewing area (4) respectively;

Step 4: the coordinate that calculates shelter (5), gather infrared signal and the writing time that first, second infrared remote receiver (31), (32) receive the tape pulse mark with locator data decipherer (7), first, second infrared remote receiver (31), (32) are received time ratio that time of the infrared light that has identical pulse and id signal generator (7) transmit same pulse signal, equal speed according to distance and multiply by the time, by calculating, thus the coordinate of location shelter (5).

7. a kind of infrared positioning method according to claim 6 is characterized in that described id signal generator (6) is that the infrared light that circulation generation pulse id signal is launched infrared transmitter (2) carries out mark.

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