KR19990017557A - Mobile vehicle location transmitter and traffic information generation method using the same - Google Patents

Abstract

The present invention provides a coordinate value obtained by extracting the coordinate data and absolute time of a mobile vehicle from a received GPS signal and extracting a pn code (by pseudo noise) in a signal having a maximum electric field from a signal received from a plurality of CDMA base stations. The present invention relates to a mobile vehicle position transmitter and a method for generating traffic information using the same, by transmitting the extracted pn code and recognizing the driving road of the mobile vehicle at the center which receives the extracted pn code. The device comprises a position recognizer 20 for decoding the longitude, latitude, altitude coordinate data and absolute time of the moving vehicle from the GPS signal; A tachometer 40 for measuring the rotational speed of the drive shaft of the vehicle; A key sensor 50 for detecting a switch contact state of a key box 50 'of the vehicle; A code extracting unit 60 for extracting a pn code in a signal having the strongest electric field from signals received from a plurality of CDMA base stations; A data transmitter 70 for transmitting data via a CDMA mobile communication line; A ROM 80 in which a transmission time of data is set; RAM 90 for temporarily storing data; Central processing unit 30 for transmitting data in accordance with the data transmission time; it is configured to provide the real-time traffic information of the road, thereby reducing the waste of time and economic loss due to traffic jams and road congestion In addition, it is possible to precisely understand whether a particular vehicle is traveling or not, and thus, it is possible to introduce a system that enables efficient management of taxis and logistics companies, and builds trust relations between labor and management such as a salary system. This is a very useful and excellent invention that can prevent road violent driving.

Description

Mobile vehicle location transmitter and traffic information generation method using the same

The present invention relates to a mobile vehicle position transmitting apparatus and a method for generating traffic information using the same, and more particularly, to decode coordinate data and absolute time of a mobile vehicle from a received GPS (Global Positioning Sytem) signal, and a plurality of CDMA base stations. By extracting the pn code (by pseudo noise) in the signal having the maximum electric field from the signal received from and transmitting the decoded coordinate value and the extracted pn code, the current position of the moving vehicle is transmitted to the GPS signal at the center. It recognizes in the area that is much narrower than the area identified by the vehicle, and accurately grasps the road on which the mobile vehicle is currently driving, and generates traffic information of the corresponding road from the received information so that the traffic information can be provided to many mobile vehicles. The present invention relates to a mobile vehicle position transmitter and a traffic information generating method using the same.

The GPS receiver installed in the vehicle decodes each coordinate data received from four satellites of the low-orbit satellite and the transmission time of the signal to obtain the coordinate data and the absolute time of the vehicle's current longitude, latitude, and altitude. In case of recognizing the current position by deciphering the C / A code provided for general commercial use, the error range of the position is about 75m and the error is large, so the position of the vehicle cannot be accurately recognized. In the case of a P code with an error range of about 15 m, the position of the moving object can be recognized very accurately, but since the code is encrypted for military use only, it cannot be decrypted by a general commercial device.

Therefore, even if a commercial GPS receiver recognizes its location and concentrates it in the center, it cannot know the exact current location of the vehicle and its driving road in the center. It is only applied to check the current level of operation in extremely limited areas, such as logistics transportation, in which roads are already defined, and when a vehicle runs on any place or road, due to the error range contained in the location information. Since it is impossible to identify the current driving road, there is a problem in that it is not possible to accurately grasp the driving trajectory of the vehicle or the traffic information of the road using this.

Accordingly, the present invention has been created to solve the above problems, a mobile vehicle position transmission apparatus capable of reducing the error range of the position obtained from the GPS signal, so that the vehicle can recognize the road currently running; Its purpose is to provide a way to verify your location.

Another object of the present invention is to provide a mobile vehicle position transmitting apparatus and a positioning method for generating traffic information on a recognized driving road of a vehicle.

Figure 1 shows the configuration of a preferred embodiment of a mobile vehicle position transmitter according to the present invention,

FIG. 2 shows a detailed configuration of the code extracting unit and the data transmitting unit of the mobile vehicle position transmitter of FIG.

3 is a block diagram of another embodiment of a mobile vehicle position transmitter according to the present invention;

4 is a flowchart of a traffic information generating method according to the present invention;

5 is a diagram illustrating an overall network configuration in which a mobile vehicle position transmitting apparatus and traffic information generation and provision using the same according to the present invention are performed.

6 illustrates, for example, the principle of identifying the driving road of the vehicle from the received data.

* Explanation of symbols for main parts of the drawings

A: mobile vehicle position transmitter according to the present invention

10: antenna

20: Global Positioning System (GPS)

30: central processing unit (CPU) 40: tachometer

40 ': car wheel 50: key sensor

50 ': key box 60: code extraction unit

61 pn code generator 62 correlator

63: comparator 64: control unit

70: data transmitter 71: diffuser

72: baseband filter 73: modulator

80: ROM 90: RAM

100: serial-to-parallel converter 110: CDMA payphone

200: CDMA wireless base station 300: CDMA mobile communication network

400: traffic information generating device 500: traffic information providing device

According to an aspect of the present invention, there is provided a mobile vehicle position transmitter, comprising: position recognition means for decoding coordinates and absolute time from a GPS signal transmitted from a satellite; Identification means for extracting a base station identification code in a signal having a maximum electric field from signals received from a plurality of CDMA base stations; And transmitting means for wirelessly transmitting the decoded coordinate values and the extracted base station identification code. The mobile vehicle position transmitting apparatus according to the present invention includes a speed detection for detecting a current speed of a vehicle. And means for transmitting further, wherein said transmitting means further transmits said sensed current velocity data.

In addition, the mobile vehicle positioning method according to the invention, the first step of identifying the position of the vehicle within a predetermined range from the coordinate data of the received mobile vehicle; A second step of identifying a location of the mobile vehicle within a narrower range from a location of a base station corresponding to the received base station identification code; And a third step of identifying a road on which the vehicle is driven by using previously stored road distribution data according to the limited location confirmation of the moving vehicle, and the movement according to the present invention. The vehicle positioning method may further include a fourth step of generating traffic information on the identified road from the speed data of the received mobile vehicle.

In the mobile vehicle position transmitting apparatus configured as described above, when the GPS signal transmitted from the satellite is input to the position recognizing means, the position recognizing means decodes the coordinate value and the absolute time of the current position of the mobile vehicle from the GPS signal. The identification means extracts an identification code of the base station from the signal received from the plurality of CDMA base stations in synchronization with the signal having the strongest electric field. When the coordinate value of the current position and the identification code of the base station is extracted, the transmitting means transmits the decoded coordinate value and the extracted base station identification code wirelessly to the center so as to determine the position of the mobile vehicle in association with the base station position.

In addition, the central information concentrator receiving the coordinate value and base station identification code transmitted from the transmitting means checks the position of the vehicle within a predetermined region from the coordinate data of the received mobile vehicle, and also identifies the received base station. After identifying the area where the base station is located from the code, the location of the vehicle is identified within a narrower range that is an intersection with the identified constant area. When the limited range of the vehicle is identified as described above, the road on which the vehicle operates is identified by using previously recorded road distribution data.

If the mobile vehicle position transmitting apparatus detects the current speed of the vehicle being driven through the speed detecting means and transmits it further, the central information concentrator obtains the traveling speed of the vehicle on the identified road. Using this, traffic information of the corresponding road can be generated.

Hereinafter, an embodiment of a mobile vehicle position transmission apparatus and a traffic information generation method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates an embodiment of a mobile vehicle position transmitting apparatus according to the present invention, and coordinate data such as longitude, latitude, altitude, and absolute coordinates of a mobile vehicle from a GPS signal received by an antenna 10 from a low-orbit satellite. A global positioning system (GPS) 20 for decoding time; A tachometer 40 for measuring the rotational speed of the drive shaft of the vehicle; A key sensor 50 for detecting a switch contact state of the key box 50 'of the vehicle; A code extracting unit 60 for extracting a pn code in a signal having the strongest electric field from signals received from a plurality of CDMA base stations; A data transmitter 70 for transmitting data via a CDMA mobile communication line; A ROM (Read Only Memory) 80 in which a transmission time of data is set; RAM 90 for temporarily storing data; And a central processing unit (CPU) 30 which receives the input data and transmits the data through the data transmitter 70 according to the data transmission time of the ROM 80.

FIG. 2 is a block diagram illustrating the code extracting unit 60 and the data transmitting unit 70 in FIG. 1 in detail. The code extracting unit 60 of FIG. 1 is a pn code generator for generating a pn code whose phase is adjusted. 61); A correlator (62) for obtaining a correlation of a signal by despreading a pn code generated by the pn code generator (61) to a pilot signal of a received input signal; A comparator (63) for comparing the correlation value from the correlator (62) with a preset reference value; And a control unit 64 for determining whether to acquire synchronization according to the comparison of the comparator 63 and for changing the pn code of the pn code generator 61 or an offset thereof. The data transmitter 70 includes a spreader 71 for spreading data to be transmitted using the determined pn code; A baseband filter 72 which passes only the signal region spread from the spreader 71; And a modulator 73 for performing I, Q phase modulation on the baseband data for transmission.

In the mobile vehicle position transmitter according to the present invention configured as described above, a data transmission time slot of the data transmitter 70 assigned to each device is first set in the ROM 80. The position recognizer 20 receives GPS signals including the longitude, latitude, elevation coordinate data, and transmission time of the signals from the four low-orbit satellites through the antenna 10 and substitutes them into a preset equation. The position and absolute time of the vehicle receiving the GPS signal are decoded and transmitted to the CPU 30.

In addition, the code extracting unit 60 uses a plurality of CDMA base stations 200 (asynchronous) that use a different code pn code for each base station, or a plurality of CDMA base stations 200 having different offsets (synchronous) as pn codes of the same code. The pn code (or the offset of the pn code) of the signal having the strongest electric field is extracted from the pilot signal received from the.), And the correlator 62 is initially set by the pn code generator 61 to the pilot signal input first. Then, the generated pn code is despread, and the despread signal is integrated for a predetermined time to obtain a correlation value. The correlation value obtained by despreading the pn code generated from the pn code generator 61 to the input pilot signal (a signal multiplied by the pn code 1) is a constant level signal when both signals are synchronized and the sequences are the same. If not, white noise is obtained. Therefore, when it is integrated for a certain time, it becomes a constant value or 0. The output value of the correlator 62 is compared with a predetermined reference value V _ref set by the comparator 63 and is output as a signal of 0 when the reference value does not reach the reference value, and is output as a signal of 1 when the reference value is exceeded. When the applied value is 0, the controller 64 determines that the synchronization of the generated pn code is not obtained, and accordingly, the control unit 64 controls the pn code generator 61 to control the pn code. One chip that outputs a 'chip add / remove signal' to shift one phase (chip, one chip is a logic signal holding time in the pn code), and is output from the pn code generator 61 The above operation is also repeated for the shifted pn code.

If the phase of the pn code is not synchronized even if the phase is different for the entire sequence, the pn code generator 61 generates the pn code of different codes, and the above-described operation is repeated again. In this operation, when the output of the comparator 63 becomes 1, the control unit 64 transmits the determined pn code (or offset of the pn code) to the CPU 30 in synchronization. When the CPU 30 receives the current coordinates of the mobile vehicle and the pn code of the nearest base station from the position recognizer 20 and the code extracting unit 60, the CPU 30 checks whether the transmission time is allocated to itself. Done. To this end, the CPU 30 continuously compares the time of 10 minutes or less of the absolute time decoded from the position recognizer 20 with the data transmission timeslot previously stored in the ROM 80. Done. That is, if a value set in the ROM 80, for example, 180, is set while the cycle time of 10 minutes or less of the decoding absolute time repeats a section of 0 to 599 (seconds), this value is decoded. The comparison is made in units of 10 minutes or less of absolute time. As a result of comparison, when the absolute time (0 to 599 (seconds)) of 10 minutes or less decoded by the position recognizer 20 matches the data transmission time slot preset in the ROM 80, the CPU 30 ) Confirms the current vehicle driving situation as follows.

The tachometer 40 measures the rotational speed of the drive shaft of the vehicle and transmits the measured value to the central processing unit 30. When the received rotational speed is 0, the key sensor ( According to the switch contact state of the key box 50 'detected at 50), it is determined whether the vehicle is currently running. If the contact state of the key box 50 'is at a (stop) or c (start), the CPU 30 judges that the vehicle is not driving and ignores the just-detected coordinate data and pn code. Detect new value again and wait until next time slot. If the contact state of the key box 50 'detected from the key sensor 50 is at b (driving), the central processing unit 30 stops due to a crosswalk or road congestion while the vehicle is currently running. It judges that the vehicle is in a state and recognizes the speed of the vehicle as zero. When the speed of the vehicle is recognized as 0 and the speed of the vehicle detected by the tachometer 40 is not 0, the central processing unit 30 receives the previously received coordinate data, the pn code, and the current of the vehicle. The speed is transmitted to the central traffic information generating device through the data transmitter 70.

When the data is input to the spreader 71, the input data is spread to the determined pn code generated by the pn code generator 61, which is currently tuned to the nearest base station, and then the baseband filter ( 72 selectively passes the data band, and is modulated by the modulator 73 to I, Q phase modulation and transmitted to the nearest CDMA radio base station P ₁ as shown in FIG. P ₁ ) is demodulated to the original data and then transmitted to the central traffic information generating apparatus 400 connected thereto via the CDMA mobile communication network 300.

On the other hand, the central processing unit (30) instead of transmitting the coordinate data of one coordinate, pn code and speed in a given transmission time slot, during the time period between the transmission time slot, when the association data and the association data is generated Periodically generate driving trajectory data associated with both the absolute time decoded by the position recognizer 20 and the unique identification number assigned to the device at regular intervals and continuously store the data in the RAM 90. When the time slot is reached, all the driving trajectory data stored in the RAM 90 during the time period may be transmitted through the data transmitter 70.

In this way, if data is transmitted in units of predetermined blocks, time slots allocated to the device can be set at longer intervals. Accordingly, congestion of mobile communication lines due to data transmission for generating traffic information can be prevented. When the unique identification number assigned to the device is transmitted together, as well as the traffic information generation, it is possible to know the trajectory of the road on which the vehicle traveled.

3 is a block diagram of another embodiment of a mobile vehicle position transmitter according to the present invention, which is a CDMA public telephone 110 instead of a code extractor 60 and a data transmitter 70 of FIG. It is configured to include; serial-to-parallel converter 100 for transmitting and receiving data through the phone (110).

3 shows that the pn code extraction and the transmission of the extracted coordinate data and the pn code are performed in the CDMA public telephone 110, and data communication between the CDMA public telephone 110 and the central processing unit 30 is performed. Except through the serial-to-parallel converter 100, the same operation as in the above-described embodiment of FIG.

4 is a flowchart of a traffic information generating method according to the present invention performed by the traffic information generating apparatus 400 of FIG. 5. Hereinafter, coordinate data, pn code, and speed data generated and transmitted by the above-described process are used. It will be described in detail how to generate traffic information on the road.

The traffic information generating apparatus 400 displays a current position of the mobile vehicle based on coordinate data among data received through the CDMA mobile communication network 300, as shown in FIG. 6 within a predetermined error range (about 75m) (C1). Is identified (S2), and also identifies the CDMA radio base station from the received pn code (or offset of the pn code) and is predominantly the pn code that is already measured and recorded from It is confirmed that the level is not constant due to obstacles such as hills (region C2) (S3).

When the two conditions C1 and C2 are identified as described above, the current position of the moving vehicle is minimized to the intersection area (hatched area) of the two areas, and the road within the minimized area (A road) is minimized. It is to identify (S4), and calculates the traffic information on the identified road using the speed data received with the coordinate data and the pn code (S5).

In FIG. 6, when the actual position R of the vehicle moves to the right, the driving road may not be known even in a region where the received pn code is predominant (A or F road), but in this case, the processing is undecided. Then, if the next received pn code data is P13, the base station code and the received coordinate data correspond to it, the previously unprocessed received information is obviously about the road A. Therefore, the data just received the traffic information on the road. Will be handled with At this time, the traffic information generating apparatus 400, it can be seen by confirming the unique identification number of the device to be transmitted with the data, that the currently received data is transmitted from the same vehicle as the vehicle that sent the unprocessed reception data.

When the calculation of the traffic flow of the corresponding road by the received data is completed as described above, the average of the road is reflected in the traffic flow information of the road generated by the previously received data, reflecting the calculated new traffic flow information. Traffic flow is calculated (S6). When the average traffic flow information is calculated as described above, the data is transmitted to the connected traffic information providing apparatus 500 to update traffic information on the corresponding road (S7). Accordingly, the traffic information providing apparatus 500 According to the traffic information providing request through the CDMA mobile communication network 300 or the public telephone network, the traffic information on the required road is provided to provide a normal driving route to the general driver.

In the above description of the embodiments, the case where the pn code detected in the signal of the CDMA base station is used has been described. However, in addition to the pn code, the above-described operation can be performed by using the confirmation code of the base station obtained after synchronizing with the pilot signal. Of course. In addition, in the case of the synchronous CDMA scheme in which each base station operates with a unique offset to the pn code, the same offset is used between non-adjacent base stations. Even in this case, the same offset within the error region (about 75 m) by the detected coordinate data is used. Since the offset is not used, the base station can be identified by the coordinate data, and the driving road of the vehicle can be identified according to the above-described process.

The mobile vehicle position transmitting apparatus and the traffic information generating method using the same according to the present invention constituted and constructed as described above, by transmitting the coordinate data and the base station identification code of the mobile vehicle together, driving the vehicle much more accurately than using only the GPS signal. As the road can be identified, it can be used to generate and provide real-time traffic information of the road, and the traffic volume can be efficiently distributed accordingly, thus saving time and economic losses due to traffic jams and road congestion. In the case of using the unique identification code of the vehicle or the device in the received data, it is possible to accurately determine whether the specific mobile vehicle is driven and the driving road by selecting an arbitrary road rather than a fixed road, so that a taxi company or a logistics company, etc. Efficient management of labor and management It is possible to introduce a system that can build a trust relationship, which is a very useful and excellent invention that can prevent road violent driving.

Claims (15)

Position recognition means for decoding coordinates and absolute time from a GPS signal transmitted from a satellite; Identification means for extracting a base station identification code in a signal having a maximum electric field from signals received from a plurality of CDMA base stations; And transmission means for wirelessly transmitting the decoded coordinate values and the extracted base station identification code. The mobile vehicle position transmitter as claimed in claim 1, wherein the base station identification code is a pn code of the base station. The apparatus of claim 1, wherein the base station identification code is an offset of the base station of the pn code. According to claim 1, 2 or 3, wherein the speed detecting means for detecting the current speed of the vehicle further comprises, wherein the transmitting means is characterized in that for further transmitting the detected current speed data Mobile vehicle position transmitter. 5. The mobile vehicle position transmission as claimed in claim 4, further comprising operation determination means for determining whether the vehicle is driven. The data transmission of the transmission means is performed at the time of operation determination of the operation determination means. Device. The moving vehicle position transmitter as set forth in claim 5, wherein said driving determination means determines that the current speed of the vehicle detected by said speed detection means is not zero. The method of claim 5, further comprising a key detecting means for detecting a state of the start key of the vehicle, wherein the operation determining means, if the current speed of the detected vehicle is 0 according to the detected key setting state A moving vehicle position transmitter, characterized in that for determining the driving of the vehicle. 4. A mobile vehicle position transmitter according to claim 1, 2 or 3, wherein data transmission by said transmission means is performed periodically at predetermined time intervals. The mobile vehicle position transmitter as claimed in claim 8, wherein the data transmission by the transmitting means is performed when the cyclic value of a part of the absolute time decoded by the position recognition means coincides with the data transmission time specified in the apparatus. 10. The apparatus of claim 8, further comprising: storage means for storing driving trajectory data associated with a position value decoded by the position recognizing means and a base station identification code extracted by the code extracting means. The transmission is a vehicle position transmitting apparatus, characterized in that for transmitting all the data previously stored in the storage means at the time of transmission. The mobile vehicle position transmitter as set forth in claim 10, wherein the driving trajectory data further includes an absolute time decoded by the position recognition means at the time of storing. 4. A mobile vehicle position transmitting apparatus according to claim 1, 2 or 3, wherein said transmitting means further transmits identification data uniquely assigned to the apparatus. 4. A mobile vehicle position transmitter according to claim 1, 2 or 3, wherein said transmission means performs data transmission via a code division multiple access (CDMA) mobile communication line. A first step of checking the position of the vehicle within a predetermined range from the coordinate data of the received moving vehicle; A second step of identifying a location of the mobile vehicle within a narrower range from a location of a base station corresponding to the received base station identification code; And a third step of identifying a road on which the vehicle is driven by using previously stored road distribution data according to the limited location confirmation of the moving vehicle. 15. The method of claim 14, further comprising the step of generating traffic information on the identified road from the speed data of the received vehicle.