CN104614735A - GPS detection method and GPS detection circuit for vehicles - Google Patents
GPS detection method and GPS detection circuit for vehicles Download PDFInfo
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- CN104614735A CN104614735A CN201310535729.4A CN201310535729A CN104614735A CN 104614735 A CN104614735 A CN 104614735A CN 201310535729 A CN201310535729 A CN 201310535729A CN 104614735 A CN104614735 A CN 104614735A
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- gps antenna
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
A GPS detection method and a GPS detection circuit for vehicles are provided. T is set to 0 by default, and Tmax is the longest time that a vehicle may be shielded in a motion state. The method comprises the following steps: (1) judging whether a GPS signal is received, repeating the step if a GPS signal is received, and going to step (2) if no GPS signal is received; (2) judging whether a GPS antenna is short-circuited, going to step (1) if the GPS antenna is short-circuited, and going to step (3) if the GPS antenna is not short-circuited; (3) judging whether the GPS antenna is open-circuited, going to step (1) if the GPS antenna is open-circuited, and going to step (4) if the GPS antenna is not open-circuited; (4) judging whether a vehicle is in a motion state, letting T=T+1 and going to step (5) if the vehicle is in a motion state, and letting T=0 and going to step (1) if the vehicle is not in a motion state; and (5) judging whether T is greater than Tmax, determining that the GPS antenna is artificially shielded if T is greater than Tmax, and returning to step (1) if T is not greater than Tmax. The method and the circuit of the invention are used for judging the reason why a vehicle cannot receive GPS signals. Thus, well execution of the vehicle management system of enterprises is guaranteed technically, and the safety of vehicle driving is improved.
Description
Technical field
The present invention relates to a kind of gps signal detection method and circuit of vehicle.
Background technology
Along with the universal use of gps satellite location technology, increasing enterprise depends on satellite positioning tech and supervises our unit's vehicle, and as: vehicle, whether route running on request, vehicle exceed the speed limit.And for institutionalized direct object---driver, may wish to break away from supervision for some reason, escape because of the punishment be subject in violation of rules and regulations.Therefore, when needs travel in violation of rules and regulations, part driver can carry out electromagnetic screen process (as antenna package wrapped with masking foil) to satellite positioning antennas temporarily, causes the satellite positioning-terminal be arranged on vehicle to locate.This behavior should pay for obviously, but detection gps antenna conductively-closed technically has certain difficulty, so enterprise also has no way out to this kind of behavior at present.
Summary of the invention
Fundamental purpose of the present invention is to overcome above-mentioned shortcoming of the prior art, proposes a kind of GPS detection method and circuit of vehicle.
The present invention adopts following technical scheme:
A GPS detection method for vehicle, presetting T=0, Tmax is vehicle when being kept in motion, and the maximum duration of possible conductively-closed, is characterized in that: comprise the steps
1) judge whether to receive gps signal, if so, then repeat this step; If not, then step 2 is entered);
2) judge gps antenna whether short circuit, if so, then enter step 1); If not, then step 3 is entered);
3) judge whether gps antenna opens a way, and if so, then enters step 1); If not, then step 4) is entered;
4) judge whether vehicle is kept in motion, if so, then T=T+1, enter step 5); If not, then T=0, enters step 1);
5) judge whether T is greater than Tmax, if so, gps antenna is artificially shielded; If not, then step 1) is got back to.
Further, in step 3), described gps antenna open circuit comprises gps antenna and does not connect or antenna loop exists open circuit.
Further, in step 4), the accekeration being detected vehicle by acceleration transducer judges whether vehicle is kept in motion.
A kind of GPS testing circuit of vehicle, comprise gps antenna, GPS module and processor, it is characterized in that: also include gps antenna open detection circuit, gps antenna short-circuit detecting circuit and acceleration transducer, this gps antenna output terminal is connected with gps antenna short-circuit detecting circuit input end with gps antenna open detection circuit input end, gps antenna open detection circuit output terminal is connected with processor with gps antenna short-circuit detecting circuit output terminal, is respectively used to judge whether gps antenna opens a way and short circuit; This GPS module output terminal is also connected with processor with acceleration transducer output terminal, is respectively used to judge whether to receive gps signal and whether vehicle moves.
Further, described gps antenna short-circuit detecting circuit comprises one first triode, one first resistance, one second resistance and one the 3rd resistance, one end of this first resistance connects base stage and second resistance one end of described first triode respectively, the other end of the first resistance connects the output terminal of described gps antenna, this the second resistance other end connects the emitter of described first triode, the grounded emitter of this first triode, the collector of this first triode also connects the 3rd resistance one end, the 3rd resistance other end is as energization input, the output level height of the collector of this first triode is for judging gps antenna whether short circuit.
Further, described gps antenna open detection circuit comprises one second triode, one the 3rd triode, one the 5th resistance, one the 6th resistance, one the 7th resistance, one the 8th resistance and one the 9th resistance; The base stage of this second triode is connected with the base stage of the 3rd triode, the base stage of the second triode is connected with its collector, the collector of the second triode is by one the 5th resistance eutral grounding, the emitter of the second triode connects the 6th resistance one end, and the 6th resistance other end is as energization input and connect the 7th resistance one end; The collector of the 3rd triode is by one the 8th resistance eutral grounding, and the emitter of the 3rd triode is connected with the other end of the 7th resistance and the output terminal of gps antenna; 9th resistance one end is connected with the 3rd transistor collector, and the output level height of the 9th resistance other end is for judging whether gps antenna opens a way.
From the above-mentioned description of this invention, compared with prior art, the present invention has following beneficial effect:
Method and circuits of the present invention for judging that vehicle cannot receive the reason of gps signal, comprise gps antenna short circuit, gps antenna open circuit or do not connect, vehicle artificially shielded by shielding of building and vehicle.Wherein, be there is various states by shielding of building in vehicle, detects that the accekeration of vehicle judges that vehicle is parked in underground garage or travels in tunnel by acceleration transducer.When excluding, cause cannot after other objective factors of receiving satellite positioning signals, when being kept in motion by preset vehicle, the maximum duration of possible conductively-closed, can show whether gps antenna is artificially shielded by multilevel iudge, thus can ensure that the management system execution of enterprise to vehicle puts in place technically, improve the security that vehicle travels.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the module map of circuit of the present invention;
Fig. 3 is gps antenna short-circuit detecting circuit figure of the present invention;
Fig. 4 is gps antenna open detection circuit figure of the present invention.
Embodiment
Below by way of embodiment, the invention will be further described.
From prior art, when gps antenna conductively-closed, GPS module can be caused to receive satellite-signal.But conversely, GPS module cannot receiving satellite signal, and does not mean that gps antenna conductively-closed, and namely except gps antenna conductively-closed, the factor causing GPS module cannot receive satellite-signal is multiple.By analysis, cause GPS module cannot receive satellite-signal because have:
1) gps antenna short circuit
2) there is open circuit or do not connect gps antenna in gps antenna loop
3) gps signal is by shielding of building
4) gps antenna is artificially shielded
Wherein, gps signal can be divided into shadow shield (as blocked by overpass) by shielding of building and shield (be parked in underground garage as vehicle or vehicle travels in tunnel) completely.Wherein, if gps signal is just by shadow shield, so GPS module still can receive the gps signal of part, is thus completely shielded so can exclude GPS.And gps signal is thus completely shielded and can be divided into according to vehicle running state: static and motion, wherein stationary state more commonly storing cycle in underground garage, and motion state more commonly vehicle travel in tunnel.The present invention in order to distinguish this two states, an integrated acceleration transducer on equipment.If cannot detect that vehicle is motion (accekeration that namely acceleration transducer exports is 0) by acceleration transducer, and not receive any gps signal, so can think that vehicle is parked in underground garage.When vehicle is in transport condition, if gps signal is thus completely shielded, so normally because vehicle travels in tunnel, the duration can not be oversize.For the Qinling Zhongnanshan Mountain vcehicular tunnel that China is the longest at present, its length, also not more than 20 kilometers, supposes that Vehicle Speed is 30 kilometers/hour, is so 40 minutes by the running time in tunnel.
Therefore, whether artificially shielded to detect gps antenna, general thought of the present invention if being: exclude that cause cannot first three factor of receiving satellite positioning signals, just can infer whether gps antenna is artificially shielded.
With reference to Fig. 1, a kind of GPS detection method of vehicle, presetting T=0, Tmax is vehicle when being kept in motion, and the maximum duration of possible conductively-closed, specifically comprises the steps
1) judge whether to receive gps signal, if so, then the non-conductively-closed of gps antenna is described, then repeats this step); If not, then step 2 is entered);
2) judge gps antenna whether short circuit, if so, then illustrate that cannot receive gps signal is caused by antenna short circuit, then enter step 1); If not, then step 3 is entered);
3) judge whether gps antenna opens a way, if so, then illustrate that gps antenna does not connect or gps antenna loop exists open circuit, then enter step 1); If not, then step 4) is entered;
4) judge whether vehicle is kept in motion by the accekeration of acceleration transducer detection vehicle, if the accekeration detected is zero, then illustrate that vehicle remains static, and may dock in underground garage, then T=0, enter step 1); If accekeration is non-vanishing, illustrates that vehicle does not but receive signal under steam, then T=T+1, enter step 5);
5) judge whether T is greater than Tmax, if so, then illustrate that, within the time of the Tmax preset, vehicle is in transport condition and does not but receive gps signal, can get rid of the possibility that vehicle travels in tunnel, show that gps antenna is artificially shielded; If not, then illustrate that gps signal may travel in tunnel, gets back to step 1).
The present invention also proposes a kind of GPS testing circuit of vehicle, with reference to Fig. 2, comprises gps antenna 1, GPS module 2, processor 3, gps antenna open detection circuit 4, gps antenna short-circuit detecting circuit 5 and acceleration transducer 6.This gps antenna 1 output terminal is connected with gps antenna short-circuit detecting circuit 5 input end with gps antenna open detection circuit 4 input end, gps antenna open detection circuit 4 output terminal is connected with processor 3 with gps antenna short-circuit detecting circuit 5 output terminal, and the level height that processor 3 exports according to level height and gps antenna short-circuit detecting circuit 5 output terminal of the output of gps antenna open detection circuit 4 output terminal respectively judges whether gps antenna 1 opens a way and short circuit.This GPS module 2 output terminal is also connected with processor with acceleration transducer 6 output terminal, is respectively used to judge whether to receive gps signal and whether vehicle moves.
With reference to Fig. 3, gps antenna short-circuit detecting circuit 5 comprises one first triode Q1, one first resistance R1, one second resistance R2 and the 3rd resistance R3, one end of this first resistance R1 connects base stage and second resistance R2 one end of the first triode Q1 respectively, the other end of the first resistance R1 connects the output terminal of gps antenna 1 as VANT signal end, this second resistance R2 other end connects the emitter of the first triode Q1, the grounded emitter of this first triode Q1.The collector of this first triode Q1 also connects one the 3rd resistance R3 one end, and the 3rd resistance R3 other end is as energization input VDD, and the output level of the collector of this first triode Q1 height is for judging gps antenna 1 whether short circuit.Under normal circumstances, the level of VANT signal end can guarantee the first triode Q1 base stage conducting, and the first triode Q1 is in state of saturation, and the collector of the first triode Q1 exports as low level.When there is antenna short circuit, VANT signal level is zero volt, first triode Q1 is in cut-off state, then the collector of the first triode Q1 exports as high level, and the selection of each resistance of above circuit and triode needs to guarantee that circuit triode can end completely and the saturated two kinds of duties of the degree of depth switch.
With reference to Fig. 4, gps antenna open detection circuit 4 comprises one second triode Q2, one the 3rd triode Q3, one the 5th resistance R5, one the 6th resistance R6, one the 7th resistance R7, one the 8th resistance R8, one the 9th resistance R9.The base stage of this second triode Q2 is connected with the base stage of the 3rd triode Q3, the base stage of the second triode Q2 is connected with its collector, the collector of the second triode Q2 is by one the 5th resistance R5 ground connection, the emitter of the second triode Q2 connects the 6th resistance R6 one end, and the 6th resistance R6 other end is as energization input VDD and connect the 7th resistance R7 one end.The collector of the 3rd triode Q3 is by one the 8th resistance R8 ground connection, and the emitter of the 3rd triode Q3 connects the output terminal of gps antenna as VANT end and is connected with the other end of the 7th resistance R7; 9th resistance R9 one end is connected with the 3rd triode Q3 collector, and the output level height of the 9th resistance R9 other end is for judging whether gps antenna 1 opens a way.
Above-mentioned gps antenna open detection circuit 4 is image current source circuit, by the resistance of build-out resistor the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 3rd triode Q3 is made to be in different duties at VANT end or gps antenna in different operating state, and then the 3rd triode Q3 collector level change, the output level of the corresponding 9th resistance R9 other end also changes thereupon; In this circuit, VANT termination gps antenna signal, under normal circumstances, the output of the 9th resistance R9 other end is low level.When not connecing gps antenna or gps antenna loop there is open circuit phenomenon, the output of the 9th resistance R9 other end is high level.
By GPS detection method and the circuit of a kind of vehicle of the present invention, can detect whether gps antenna is artificially shielded, thus can ensure that the management system execution of enterprise to vehicle puts in place technically, improve the security that vehicle travels.
Above are only the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, all changes utilizing this design the present invention to be carried out to unsubstantiality, all should belong to the behavior of invading scope.
Claims (6)
1. a GPS detection method for vehicle, presetting T=0, Tmax is vehicle when being kept in motion, and the maximum duration of possible conductively-closed, is characterized in that: comprise the steps
1) judge whether to receive gps signal, if so, then repeat this step; If not, then step 2 is entered);
2) judge gps antenna whether short circuit, if so, then enter step 1); If not, then step 3 is entered);
3) judge whether gps antenna opens a way, and if so, then enters step 1); If not, then step 4) is entered;
4) judge whether vehicle is kept in motion, if so, then T=T+1, enter step 5); If not, then T=0, enters step 1);
5) judge whether T is greater than Tmax, if so, gps antenna is artificially shielded; If not, then step 1) is got back to.
2. the GPS detection method of a kind of vehicle as claimed in claim 1, is characterized in that: in step 3), and described gps antenna open circuit comprises gps antenna and do not connect or antenna loop exists open circuit.
3. the GPS detection method of a kind of vehicle as claimed in claim 1, is characterized in that: in step 4), and the accekeration being detected vehicle by acceleration transducer judges whether vehicle is kept in motion.
4. the GPS testing circuit of a vehicle, comprise gps antenna, GPS module and processor, it is characterized in that: also include gps antenna open detection circuit, gps antenna short-circuit detecting circuit and acceleration transducer, this gps antenna output terminal is connected with gps antenna short-circuit detecting circuit input end with gps antenna open detection circuit input end, gps antenna open detection circuit output terminal is connected with processor with gps antenna short-circuit detecting circuit output terminal, is respectively used to judge whether gps antenna opens a way and short circuit; This GPS module output terminal is also connected with processor with acceleration transducer output terminal, is respectively used to judge whether to receive gps signal and whether vehicle moves.
5. the GPS testing circuit of a kind of vehicle as claimed in claim 4, it is characterized in that: described gps antenna short-circuit detecting circuit comprises one first triode, one first resistance, one second resistance and one the 3rd resistance, one end of this first resistance connects base stage and second resistance one end of described first triode respectively, the other end of the first resistance connects the output terminal of described gps antenna, this the second resistance other end connects the emitter of described first triode, the grounded emitter of this first triode, the collector of this first triode also connects the 3rd resistance one end, the 3rd resistance other end is as energization input, the output level height of the collector of this first triode is for judging gps antenna whether short circuit.
6. the GPS testing circuit of a kind of vehicle as claimed in claim 4, is characterized in that: described gps antenna open detection circuit comprises one second triode, one the 3rd triode, one the 5th resistance, one the 6th resistance, one the 7th resistance, one the 8th resistance and one the 9th resistance; The base stage of this second triode is connected with the base stage of the 3rd triode, the base stage of the second triode is connected with its collector, the collector of the second triode is by one the 5th resistance eutral grounding, the emitter of the second triode connects the 6th resistance one end, and the 6th resistance other end is as energization input and connect the 7th resistance one end; The collector of the 3rd triode is by one the 8th resistance eutral grounding, and the emitter of the 3rd triode is connected with the other end of the 7th resistance and the output terminal of gps antenna; 9th resistance one end is connected with the 3rd transistor collector, and the output level height of the 9th resistance other end is for judging whether gps antenna opens a way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310535729.4A CN104614735A (en) | 2013-11-01 | 2013-11-01 | GPS detection method and GPS detection circuit for vehicles |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310535729.4A CN104614735A (en) | 2013-11-01 | 2013-11-01 | GPS detection method and GPS detection circuit for vehicles |
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| CN104614735A true CN104614735A (en) | 2015-05-13 |
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| CN201310535729.4A Pending CN104614735A (en) | 2013-11-01 | 2013-11-01 | GPS detection method and GPS detection circuit for vehicles |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166866A1 (en) * | 2016-03-29 | 2017-10-05 | 福建工程学院 | Parking entrance recognition method and system |
| CN108646262A (en) * | 2018-03-27 | 2018-10-12 | 斑马网络技术有限公司 | Vehicle-state monitoring method, equipment, storage medium and vehicle |
| CN109613575A (en) * | 2018-12-12 | 2019-04-12 | 成都路行通信息技术有限公司 | A kind of shielded method for early warning of intelligent positioner signal |
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| CN102967793A (en) * | 2012-11-23 | 2013-03-13 | 深圳市航盛电子股份有限公司 | Open-circuit short-circuit detection circuit of car-mounted terminal antenna |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11160410A (en) * | 1997-11-29 | 1999-06-18 | Matsushita Electric Works Ltd | Gps receiver |
| CN201298293Y (en) * | 2008-10-14 | 2009-08-26 | 杭州中导电子技术有限公司 | GPS terminal device with vibration sensor |
| CN201489075U (en) * | 2009-08-19 | 2010-05-26 | 成都成电亿赛科技股份有限公司 | GPS active antenna on-off detection device |
| CN102064517A (en) * | 2010-08-24 | 2011-05-18 | 深圳市九洲电器有限公司 | Set top box and antenna short circuit protection module thereof |
| CN202102073U (en) * | 2011-05-19 | 2012-01-04 | 上海工力自动化仪表有限公司 | Short-circuit and broken-circuit detecting device for GPS (Global Positioning System) vehicle-mounted terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166866A1 (en) * | 2016-03-29 | 2017-10-05 | 福建工程学院 | Parking entrance recognition method and system |
| CN108646262A (en) * | 2018-03-27 | 2018-10-12 | 斑马网络技术有限公司 | Vehicle-state monitoring method, equipment, storage medium and vehicle |
| CN109613575A (en) * | 2018-12-12 | 2019-04-12 | 成都路行通信息技术有限公司 | A kind of shielded method for early warning of intelligent positioner signal |
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Application publication date: 20150513 |
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