CN100480633C - Radio frequency card type electronic navigation device - Google Patents
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- CN100480633C CN100480633C CNB2004100668048A CN200410066804A CN100480633C CN 100480633 C CN100480633 C CN 100480633C CN B2004100668048 A CNB2004100668048 A CN B2004100668048A CN 200410066804 A CN200410066804 A CN 200410066804A CN 100480633 C CN100480633 C CN 100480633C
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Abstract
The invention relates to a wireless radio frequency card type electric navigator, which comprises a radio frequency card type volume mark used to store the address information code of the location of volume mark, a microprocessor, a reader used to detect and decode the code of the volume mark, a display, a wire, a storage used to store the location information, the around constructing information, the road information and the byroad information which are respondent to the self encoding information; the volume mark is arranged on the road with a certain distance; the microprocessor receives the outputted volume mark code of the reader and computes the location information, the around constructing information, the road information and the byroad information which are respondent to the self encoding information and outputs and displays the information on the display screen.
Description
(1) technical field
The invention belongs to the application on aspect the city tour-guide of less radio-frequency RFID technology and infotech, be applicable to electronic navigation device unfamiliar local of city situation and nonlocal visitor.
(2) background technology
To the stranger of strang country, do not know all directions in city at the beginning of one, certain bar road of not knowing the city how to get to.The street is common often to be held map while walking to some strangers and asks the way on one side.At one thousands of streets are arranged, every the street is grown several kilometers, even in tens kilometers the big city,, look for the address as looking for a needle in a haystack if the address of looking for is not main street, the map that can buy on the market all has only arterial street again, the people that gos out often has such experience, no matter is in the city of oneself living or to strange city, and the address of finding oneself to look for is also failed in sometimes hard twists and turns, often walk many longer ways, wasted many times; Caused unnecessary trouble for commercial affairs work to some personnel that have important business; To the stranger who drive to drive, that is just more miserable for situation, illegal parking takes place, turn around, change by force etc. and easily send out the accident behavior owing to can not find the address, and when making troubles to urban transportation, the person for driving a car has also suffered various losses; For fail to understand the again external visitor of map of language obstacle, difficulty is just bigger simply just as a stray; Even,, tear down and build and build, also be absorbed in the condition of looking for the address difficulty along with the construction speed in city is accelerated from autochthonous people; At present the coding scheme of road, house number has been not suitable for the needs of the sign of modern city in a word, LBS (Location based Services) is exactly allly can provide the types of applications relevant with the position to serve all to can be described as LBS based on the service of location from literal interpretation.Though the navigational system of automobile is also arranged in addition at present, these systems all are based upon on Global Positioning System (GPS) (GPS) and mobile communication positioning system (GIS) basis, Global Positioning System (GPS) is except the cost of use height, also bigger in order to obtain higher positional precision to the one-time investment of sensor, for the mobile communication positioning system except positional precision is not high be not enough to, also will spend some daily costs of use, main is to be difficult to obtain more road information, peripheral commercial matters information and urban culture sight spot information.
RFID is the abbreviation of English " Radio Frequency Identification ", and Chinese is called less radio-frequency identification, induction type electronic chip or closely connects card, contactless card, non-contact card ... or the like, be a kind of of contactless automatic identification technology.The simplest rfid system is made up of label (Tag), reader (Reader) and antenna (Antenna) three parts: after label enters field region, the reader that receives sends signal, rely on the energy that induction current obtained to send out information (the Passive Tag that is stored in the chip, the non-transformer label or claim passive label), after reader reads information and decoding, deliver to infosystem and carry out relevant processing, need other software and hardware support in the practical application.The RFID characteristic of utilizing among the present invention mainly contains: 1) data write (Read Write) function, as long as can not need contact by RFID Reader, directly read message; 2) easy miniaturization and diversified shape, RFID is not subjected to the restriction of size and shape on reading; 3) environment resistant, RFID but has powerful pollution resistance to materials such as water, oil and medicines.RFID also can reading of data among dark or dirty environment; 4) reusable, because RFID is an electronic data, can be written repeatedly, therefore can reclaim label and reuse.As passive type RFID, do not need battery just can use, there are not the needs of maintaining; 5) penetrability, RFID also can carry out the penetrability communication if coated by nonmetal or nontransparent material such as paper, timber and plastics; 6) memory capacity of data is big, and data capacity can enlarge along with the development of memory specification, can not be restricted this RFID.
Before the present invention makes strange city had still been arrived in own city of living, to can with communication still can't use communication, can only reach the destination of oneself by the guideboard on city map and the street or guide's help.These methods exist many inconvenience and disturbance factor to the stranger to the strang country at the beginning of, the address of finding oneself to look for is also failed in sometimes hard twists and turns, many longer ways have often been walked, many times have been wasted, limit action space, reduced the quality of out on tours or commercial activity.Postal and telecommunication entities are annual owing to can not find delivery people address, and the mail Loss Rate belongs to out of use scope substantially between 6-18%; At present the road traffic congestion phenomenon is very outstanding, and the volume of traffic of 5-9% unclear the causing that be the address, can not find the address and illegal parking takes place, turn around, change by force etc. and easily send out accident; Because the unclear public security rescue efficient that reduced in address; At present the road sign in city has been listed as street name, place name as far as possible, but does not have direction, does not also have number, even the street that will look for is not in the above, or the street that is listed as above is not familiar with, and can't help busy yet.In a word along with the process of China's urban internationalization, the coordinatograph of urban addresses, code digitization have arrived extremely urgent the time.Therefore how providing the service of leading the way by RFID technology and infotech to the walking of going out and help, to raising live in this city still to strange city the crowd life, work and travelling quality, lifting China modernized city level, set up good international influence positive effect arranged.
(3) summary of the invention
For positioning navigation device cost of use height in the prior art, the incomplete deficiency of positional precision information not high, that provide are provided, the invention provides a kind of by means of electronic navigation device be distributed in geographic position electronic tag on each street, city for the people's that go out life, work, commercial affairs with travel omnibearing geography information, business information and sight spot information service, cost of use is low, positional precision is high radio frequency card type electronic navigation device are provided.
The technical scheme that the present invention is adopted for its technical matters of solution is:
A kind of radio frequency card type electronic navigation device, include the coding that is used to deposit the on-site address information of label frequency card type label, microprocessor, be used for to the coding of label carry out reader, display, the antenna of demodulation sign indicating number, storer and the label that is used to deposit with various self coded message corresponding position information of label, surrounding building information, road information, branch road information is provided with system, described label is positioned at a certain distance the road continuously; Described microprocessor receives the label coding of described reader output, and calculate and corresponding positional information, surrounding building information, road information, the branch road information that is preset in the storer of label self coded message, and described various information are outputed to the display demonstration.
Further, described electronic navigation device also includes instantaneous speech power; Described microprocessor also comprises a translation unit, is used for the various information of described reader output are translated into voice messaging, and outputs to described instantaneous speech power.
Further again, described label coding comprises absolute position encoder, be used to represent from the relative position of setting the coordinate central point logic mark code, be used for natural number coding, branch road information coding from the label numbering of the origin-to-destination of road; Described label is encoded to the coding of 23 figure places;
Absolute position encoder is the most preceding 6, and wherein the 1st to the 3rd bit representation longitude, and the 4th to the 6th bit representation latitude;
Logic mark code is the 7th to 17, with described coordinate central point the zone is divided into A, B, C, D4 quadrant district, the quadrant district at the starting point place of the 7th bit representation road, the x that represents the two ends, street with 4 bit digital, the y coordinate, the 8th x coordinate to the 9th bit representation street starting point, the 10th y coordinate to the 11st bit representation street starting point, the quadrant district at the terminal point place of the 12nd bit representation road, the 13rd x coordinate to the 14th bit representation street terminal point, the 15th y coordinate to the 16th bit representation street terminal point, for two parallel and two ends x, the street that the y coordinate is identical is aided with lowercase (a, b, c, d) order difference is represented with the 17th figure place; Natural number coding is the 18th to the 22nd, according to from south to north, ascending numbering from the east to the west, for road both sides street crossing is arranged, layout is carried out at single right two ends that extend to, a left side, for have only one-sided street crossing if adopt the odd number layout, in the right-hand employing even numbers layout of road at the left of road;
Branch road information is encoded to the 23rd, and the branch road information coding on the street crossing is different with the branch road information coding on the runway, and the branch road information coding N on the runway represents that the place ahead is obstructed, and L represents to turn right and forbids, R represents to turn left to forbid; And branch road information coding 0 expression on the street crossing does not have the branch road, the 3 expression junctions of three roads, and 4 expressions, four forks in the road, N represents that the place ahead is obstructed.
Further, depositing the urban information corresponding in the described storer with absolute position encoder, with urban road logic mark code road corresponding information, with corresponding surrounding building information, transport information, commercial matters information, urban culture information and the scenery travelling information of front three of logic mark code and natural number coding, with the corresponding branch road information of branch road information coding.
Further, described electronic navigation device is wearing type or small-sized Luggage Cart type or mobile unit.
Radio frequency card type electronic navigation device of the present invention beneficial effect compared with prior art mainly shows: by means of microprocessor and frequency card type label, making that the user walks on road can be as the map of living in (driving) process, (driving) can obtain road information while walking, positional information, obtain the transport information that is associated with this zone in the city for the coded message of nonlocal visitor by the geographic position electronic tag, commercial matters information, historical and the scenery travelling sight spot information of urban culture, can bring more convenience to tourists from both home and abroad, more information, introduction by a large amount of humanity history sight spots, city, understood the culture in city, historical, state of trade, increase the enjoyment of tourism, improved the grade in city; On road surface and very convenient, also can combine simultaneously, can provide comprehensive service for the user, and cost of use be low, positional precision is high with mobile communications device along cohering the RFID label on the metope of road.
(4) description of drawings
Fig. 1 is the basic comprising schematic diagram of radio frequency card type electronic navigation device of the present invention.
Fig. 2 is provided with the partial schematic diagram of system for label of the present invention.
Fig. 3 is the synoptic diagram that the logic of the RF-type label among the embodiment marks the division quadrant of code.
Fig. 4 is the processing flow chart of described radio frequency card type electronic navigation device.
(5) embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
With reference to Fig. 1, a kind of radio frequency card type electronic navigation device, include the frequency card type label 9 of the coding that is used to deposit the on-site address information of label, microprocessor 5, be used for the coding of label is carried out the reader 3 of demodulation sign indicating number, display 6, antenna 2, be used to deposit various self coded message corresponding position information with label, surrounding building information, road information, the storer 4 and the label of branch road information are provided with system, described label 9 is positioned at a certain distance the road continuously, label 9 is distributed on each road in city, microprocessor 5 receives the label coding of described reader 3 outputs, and calculate and the corresponding positional information that is preset in the storer 4 of label 9 self coded message, surrounding building information, road information, branch road information, and described various information are outputed to display 6 show.
Described electronic navigation device also includes instantaneous speech power 8; Microprocessor 5 also comprises a translation unit, is used for described various information are translated into voice messaging, and outputs to described instantaneous speech power.
The coding of label 9 comprises absolute position encoder, be used to represent from the relative position of setting the coordinate central point logic mark code, be used for natural number coding, branch road information coding from the geographic position electronic tag numbering of the origin-to-destination of road; The coding that is encoded to 23 figure places of described label 9; Absolute position encoder is the most preceding 6, and wherein the 1st to the 3rd bit representation longitude, and the 4th to the 6th bit representation latitude; Logic mark code is the 7th to 17, with described coordinate central point the zone is divided into A, B, C, D4 quadrant district, the quadrant district at the starting point place of the 7th bit representation road, the x that represents the two ends, street with 4 bit digital, the y coordinate, the 8th x coordinate to the 9th bit representation street starting point, the 10th y coordinate to the 11st bit representation street starting point, the quadrant district at the terminal point place of the 12nd bit representation road, the 13rd x coordinate to the 14th bit representation street terminal point, the 15th y coordinate to the 16th bit representation street terminal point, for two parallel and two ends x, the street that the y coordinate is identical is aided with lowercase to be distinguished in proper order, represents with the 17th figure place; Natural number coding is the 18th to the 22nd, according to from south to north, ascending numbering from the east to the west, for road both sides street crossing is arranged, layout is carried out at single right two ends that extend to, a left side, for have only one-sided street crossing if adopt the odd number layout, in the right-hand employing even numbers layout of road at the left of road; Branch road information is encoded to the 23rd, and the branch road information coding on the street crossing is different with the branch road information coding on the runway, and the branch road information coding N on the runway represents that the place ahead is obstructed, and L represents to turn right and forbids, R represents to turn left to forbid; And branch road information coding 0 expression on the street crossing does not have the branch road, the 3 expression junctions of three roads, and 4 expressions, four forks in the road, N represents that the place ahead is obstructed.
Depositing the urban information corresponding in the storer 4 with absolute position encoder, with urban road logic mark code road corresponding information, with corresponding surrounding building information, transport information, commercial matters information, urban culture information and the scenery travelling information of front three of logic mark code and natural number coding, with the corresponding branch road information of branch road information coding.
Described electronic navigation device is wearing type or small-sized Luggage Cart type or mobile unit.
As shown in Figure 1 and in conjunction with Fig. 2, Fig. 3, Fig. 4, embodiment of the present invention and principle of work are: user 1 carries by antenna 2, reader 3, storer 4, microprocessor 5, display 6, instantaneous speech power 7, the electronic navigation device that input media 8 is formed, for the pedestrian, electronic navigation device can be designed to wearing type, also can be designed to small-sized Luggage Cart type, for the motorist, electronic navigation device can be designed to mobile unit, cohering RFID geographic position electronic tag 9 on the surface of the street or on the wall along the street at a certain distance continuously, label 9 is the geographic position electronic tag, label coats with nonmetallic materials, in order to avoid damaged, the label numbering is named with 23 figure places, adopt the coordinate arranged mode, 3 bit representation longitudes (representing with angle) are wherein gone up in the absolute position in preceding 6 these places of bit representation, down 3 bit representation latitudes (representing with angle), such as the data that obtain is 120030,120 expression east longitudes, 120 degree, 030 expression north latitude, 30 degree, corresponding city is the Hangzhou; As shown in table 1, table 1 is the relevant urban information table in absolute position:
| 116040 | Beijing |
| 121031 | Shanghai City |
| 120030 | The Hangzhou |
| …… | …… |
Table 1
Logic mark code is the 7th to 17, these 11 are used for expression from intown relative position, its naming rule is: with significant position, city center is initial point, East and West direction is the x axle, the north-south is the y axle, the city is divided into A, B, C, D4 quadrant district, consider that the megalopolis is in district radius 100km, the x (2 bit digital) that represents the two ends, street with 4 bit digital, y (2 bit digital) coordinate, for two parallel and two ends x, the street of y coordinate identical (coordinate points is at a distance of in the 1km scope) can be aided with a, b, c....... order difference, for example if Hangzhou Yan Anlu is made as y axle (the north and south axle of Hangzhou), the belt North Road is made as x axle (the thing axle of Hangzhou), then the logic of Wen Sanlu mark can be expressed as D0202D0702a, from mark can directly read Wen Sanlu in the city center northwest (D district) on (martial arts circles square), the Wen Sanlu starting point is positioned at the city center westwards in the 2km, to the 2km of NATO, the Wen Sanlu terminal point is the northwest (D district) on (martial arts circles square) in the city center, about westwards 7km is to the 2km of NATO in the city center, and parallel with a Wen Sanlu kilometer range also has a street with interior; What there was the square in the city center is the center with the square, and what do not have the square is the center with the famous buildings in city center; Referring to table 2, table 2 is the relevant path information table of logic mark code:
| D0202D0702a | Wen Sanlu is the northwest (D district) on (martial arts circles square) in the city center, the Wen Sanlu starting point is positioned at the city center westwards in the 2km, to the 2km of NATO, the Wen Sanlu terminal point is the northwest (D district) on (martial arts circles square) in the city center, parallel with a Wen Sanlu kilometer range with interior also have a street in the city center about westwards 7km to the 2km of NATO |
| …… | …… |
| …… | …… |
| …… | …… |
Table 2
Ensuing 5 are encoded to the Native digits coding, from the ascending numbering of the origin-to-destination of road, begin from nearest intown crossing to compile for the side street lane, for entering sub-district, hospital, park etc. the place of inlet is arranged, begin from south to north from the porch, ascending numbering from the east to the west, for road both sides street crossing is arranged, layout is carried out at single right two ends that extend to, a left side, for have only one-sided street crossing if adopt the odd number layout, in the right-hand employing even numbers layout of road at the left of road; Referring to table 3, table 3 is information tables such as the relevant surrounding building of the front three of logic mark code and natural number coding, cultural and recreational facilities, shopping introduction, scenic spot introduction:
| D0202D0702a001 | Post and telecommunications hospital |
| D0202D0702a001 | Hangzhou TV station |
| D0202D0702a020 | The museum of natural history, Zhejiang Province |
| …… | …… |
Table 3
Last bit representation branch road situation, the branch road information coding on the street crossing is different with the branch road information coding on the runway, and the branch road information coding N on the runway represents the place ahead difference, and L represents to turn right and forbids, and R represents to turn left to forbid; And branch road information coding 0 expression on the street crossing does not have the branch road, the 3 expression junctions of three roads, 4 expressions, four forks in the road, N represents that the place ahead is obstructed, by this coding scheme, can know oneself on Na Tiaolu, to walk, be the south or the north on the road, what just walk toward direction, any old place in the city, can both calculate the address that will look for should walk from which side, how far also had, the more important thing is, how soon urban development all need not change original number if changing, each label 9 numbering all is only, and self coded message in certain label 9 must be corresponding one by one with the information on the real road, be pre-written in the storage unit of label 9 by the numbering of write device with 23 bit position information and road information, cohering of the label 9 on the road is to arrange by above-mentioned rule.
When user 1 is carrying electronic navigation device and is entering certain label 9 field region, label 9 obtains energy and is activated, label 9 sends self coded message by label 9 built-in transmitting antennas, the receiving antenna of electronic navigation device receives the carrier signal of sending from radio-frequency card 9, be sent to microprocessor 5 through the antenna adjustments device, the signal of 5 pairs of receptions of microprocessor carries out the demodulation sign indicating number, depositing the urban information relevant in the storer 4 with the absolute position, which city just can get by preceding 6 latitude and longitude information is in up till now, what orientation, also depositing in the storer 4 and the relevant road information of urban road logic mark, such as the logic mark code that obtains in the Hangzhou is that D0202D0702a then represents to be on the Wen Sanlu, ensuing 5 natural number codings are if 00688, then represent from the right side of civilian three tunnel sections of beginning (Hu Shu crossing) about 68 meters, storer 4 is also being deposited and the relevant surrounding building information of preceding 3 of logic mark code+natural number coding (in 10 meters in the present location), can calculate 10 meters titles according to preceding 3 information of logic mark code+natural number coding that obtain with interior various buildingss, and with these 14 code dependent commercial matters informations, historical and the scenery travelling sight spot information of urban culture, in order to calculate direction of travel, the present invention adopts under same logic mark code prerequisite and sees 5 natural number codings again, if 5 natural number codings that read in last time are 00686, these 5 natural number codings that read in are 01088, expression is to head west away from east orientation on Wen Sanlu so, road information to obtaining then, positional information, luxurious life by eating, drinking and playing Business Information and surrounding building information are organized into natural language, microprocessor 5 is translated into voice messaging by the phonetic dictionary in the storer 4 with result then, tell the position at the present place of user by instantaneous speech power 7, where the place ahead is, near voice messagings such as what buildings are arranged, the enterprising rower of electronic chart to this city in microprocessor 5 storage unit is established present residing position, residing position icon representation, microprocessor 5 calculates user's direction of travel according to the number information of the label 9 that front and back obtain, the motorist uses the icon of car, the icon of pedestrian's personnel selection, the icon working direction of car is represented present actual driving direction of travel, people's icon frontal is represented pedestrian's direction of travel, if the user has imported the destination of wishing arrival by input media 8, electronic navigation device calculates nearest course automatically, the prompting user toward what direction walks, " nearest neighbor point " path and navigation feature are provided, make user's information service of in time being walked.Even adopt electronic navigation device and be distributed in that geographic position electronic tag on each street, city provides a kind of and also need not conduct a sightseeing tour, not need map in a complete strange city, need not ask the way just can arrive the destination with shortest path, for the people's that go out life, work, commercial affairs and travelling provides omnibearing geography information, business information and sight spot information service.
Claims (7)
1, a kind of radio frequency card type electronic navigation device, it is characterized in that: include the coding that is used to deposit the on-site address information of label frequency card type label, microprocessor, be used for to the coding of label carry out reader, display, the antenna of demodulation sign indicating number, storer and the label that is used to deposit with various self coded message corresponding position information of label, surrounding building information, road information, branch road information is provided with system, described label is positioned at a certain distance the road continuously;
Described microprocessor receives the label coding of described reader output, and calculate and corresponding positional information, surrounding building information, road information, the branch road information that is preset in the storer of label self coded message, and described various information are outputed to the display demonstration; Described electronic navigation device also includes instantaneous speech power; Described microprocessor also comprises a translation unit, is used for described various information are translated into voice messaging, and outputs to described instantaneous speech power;
Described label coding comprises absolute position encoder, be used to represent from the relative position of setting the coordinate central point logic mark code, be used for natural number coding, branch road information coding from the geographic position electronic tag numbering of the origin-to-destination of road; Described geographic position electronic tag is encoded to the coding of 23 figure places;
Absolute position encoder is the most preceding 6, and wherein the 1st to the 3rd bit representation longitude, and the 4th to the 6th bit representation latitude;
Logic mark code is the 7th to 17, with described coordinate central point the zone is divided into A, B, 4 quadrant districts of C, D, the quadrant district at the starting point place of the 7th bit representation road, x, the y coordinate of representing the two ends, street with 4 bit digital, the 8th x coordinate to the 9th bit representation street starting point, the 10th y coordinate to the 11st bit representation street starting point, the quadrant district at the terminal point place of the 12nd bit representation road, the 13rd x coordinate to the 14th bit representation street terminal point, the 15th y coordinate to the 16th bit representation street terminal point; Be aided with lowercase for two parallel and two ends x, street that the y coordinate is identical and distinguish in proper order, represent with the 17th figure place;
Natural number coding is the 18th to the 22nd, according to from south to north, ascending numbering from the east to the west, for road both sides street crossing is arranged, layout is carried out at single right two ends that extend to, a left side, for have only one-sided street crossing if adopt the odd number layout, in the right-hand employing even numbers layout of road at the left of road;
Branch road information is encoded to the 23rd.
2, radio frequency card type electronic navigation device as claimed in claim 1, it is characterized in that: described branch road information is encoded to the branch road information coding on the street crossing, branch road information coding 0 expression on the described street crossing does not have the branch road, the 3 expression junctions of three roads, 4 expressions, four forks in the road, N represents that the place ahead is obstructed.
3, radio frequency card type electronic navigation device as claimed in claim 2, it is characterized in that: described branch road information is encoded to the branch road information coding on the runway, branch road information coding N on the described runway represents that the place ahead is obstructed, and L represents to turn right and forbids, R represents to turn left to forbid.
4, as the described radio frequency card type electronic navigation device of one of claim 1-3, it is characterized in that: depositing the urban information corresponding in the described storer with absolute position encoder, with urban road logic mark code road corresponding information, with corresponding surrounding building information, transport information, commercial matters information, urban culture information and the scenery travelling information of front three of logic mark code and natural number coding, with the corresponding branch road information of cross road information coding.
5, radio frequency card type electronic navigation device as claimed in claim 4 is characterized in that: described electronic navigation device is a wearing type.
6, radio frequency card type electronic navigation device as claimed in claim 4 is characterized in that: described electronic navigation device is small-sized Luggage Cart type.
7, radio frequency card type electronic navigation device as claimed in claim 4 is characterized in that: described electronic navigation device is a mobile unit.
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| CNB2004100668048A CN100480633C (en) | 2004-09-29 | 2004-09-29 | Radio frequency card type electronic navigation device |
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| CNB2004100668048A CN100480633C (en) | 2004-09-29 | 2004-09-29 | Radio frequency card type electronic navigation device |
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| CN1755329A CN1755329A (en) | 2006-04-05 |
| CN100480633C true CN100480633C (en) | 2009-04-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102095423A (en) * | 2009-12-09 | 2011-06-15 | 广州盛华信息技术有限公司 | Navigation aid system |
| CN102455186A (en) * | 2010-10-14 | 2012-05-16 | 阿丹电子企业股份有限公司 | Action travel navigation and guide device and navigation and guide method therefor |
| CN103063220B (en) * | 2012-12-26 | 2016-05-25 | 深圳市诺威达科技有限公司 | A kind of automobile navigation method and auto-navigation system |
| CN106683419B (en) * | 2017-03-20 | 2020-03-20 | 联想(北京)有限公司 | Method for identifying traffic flow direction and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030080901A1 (en) * | 2001-10-25 | 2003-05-01 | Koninklijke Philips Electronics N.V. | RFID navigation system |
| US6580978B1 (en) * | 2002-04-15 | 2003-06-17 | United Defense, Lp | Path following using bounded beacon-aided inertial navigation |
| CN1438494A (en) * | 2002-12-23 | 2003-08-27 | 冯鲁民 | Assistant system for person to walk out |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030080901A1 (en) * | 2001-10-25 | 2003-05-01 | Koninklijke Philips Electronics N.V. | RFID navigation system |
| US6580978B1 (en) * | 2002-04-15 | 2003-06-17 | United Defense, Lp | Path following using bounded beacon-aided inertial navigation |
| CN1438494A (en) * | 2002-12-23 | 2003-08-27 | 冯鲁民 | Assistant system for person to walk out |
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