JPH10206183A - System for detecting position of moving body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate man's carrying at all times and detect a position surely by making a device set to a moving body compact and light-weight. SOLUTION: An antenna and an inquiry device are set in a street lamp 53. When a man holding an answering device 60 passes under the street lamp, the responder receives an inquiry wave from the inquiry device and emits a response wave modulated with an ID(identification) code. The inquiry device receives the response wave, detects the ID code from a received signal, and transmits information of the ID code of the responder, the present time and an ID code of the street lamp to a terminal apparatus 59 via a telephone network 58. The terminal apparatus detects from the information from the street lamp under which of the street lamps and when the man to be searched for passes. The detected result is displayed at a display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving object position detecting system for detecting the position of a moving object such as a person or a car.

[0002]

2. Description of the Related Art For example, as a system for searching for a person's location using radio waves, a magazine "Nikkei Electronics" is available.
PHS (Personal Handyphone Syst.), As described on July 125, 1996, pages 125-127.
em). This is because a PHS terminal is carried by a person, radio waves automatically transmitted by the PHS terminal are received by three base stations, electric field strengths at respective receiving points are sent to a center, and the PHS terminal is operated by the principle of triangulation at the center. , That is, the position of a person is estimated.

[0003] Further, Japanese Unexamined Patent Publication No. 8-65413 discloses a portable telephone and a GPS (Grobal Positio).
ning System) A device that combines a receiver with a person. This device is carried by a person who needs protection, for example.
When an incoming call is received from a guardian to a mobile phone of a person who needs protection, the current location information obtained from the GPS is automatically transmitted from the mobile phone to the guardian.

[0004]

In the case of using the former PHS terminal, the number of slave stations that can access one base station is three.
Due to restrictions on the number of units, if there are many users of PHS terminals, such as in the city center, there may be situations where connection is not possible, and there are few base stations in suburbs such as residential areas,
Therefore, there is a problem that is not suitable for a search that requires urgency and certainty.

[0005] Further, in the latter case of using a combined device of a mobile phone and a GPS receiver, two conditions must be satisfied: a communication area of the mobile phone and a location where GPS radio waves can be received. However, since it does not work, there is a problem that is not suitable for searches that require urgent and certainty.

In addition, the position accuracy by these methods is 10
It was about 0 m, and there was a problem that the search range could not be narrowed down.

[0007] Further, both have a common problem that they are large and heavy to carry at all times, and for example, they are not suitable for use such as sewing on clothes and carrying. further,
Mobile phones also have the problem that transmitted radio waves have an adverse effect on cardiac pacemakers.

Therefore, according to the first to third aspects of the present invention, it is possible to reduce the size and weight of the equipment to be arranged on a moving body such as a person, and therefore to easily carry the equipment at all times without adversely affecting the cardiac pacemaker. Also, there is provided a moving object position detection system capable of reliably detecting the position of a moving object without any restrictions such as a wireless connection state with a base station and a reception state of satellite radio waves.

Further, the invention according to claim 2 further provides a moving object position detecting system capable of detecting a moving object more accurately.

[0010] The invention according to claim 3 further provides a moving object position detecting system capable of accurately estimating the current position of the moving object.

[0011]

According to the first aspect of the present invention,
A street light that receives power supply from the power supply wiring, turns on the lamp, and transmits failure information via a communication line when a failure occurs, a moving object equipped with a source of moving object identification information, and a street light at the same position as the street light A moving body position detecting means for installing and receiving power supply from a power supply wiring, receiving moving body identification information from the moving body and detecting a position of the moving body, and a moving body position detecting information from the moving body position detecting means. Transmitting means for automatically transmitting, via a communication line, moving body identification information, information for notifying the position of a street light, time information, etc., based on the communication line, and receiving information from the transmission means. And a terminal device for outputting.

According to a second aspect of the present invention, in the moving object position detecting system according to the first aspect, when the moving object receives the interrogation radio wave from the interrogator, the transponder emits a response radio wave including the moving object identification information. Or, a transmitter that spontaneously emits a radio wave including the mobile object identification information is provided, and the mobile object position detection means emits an interrogation radio wave and, upon receiving a response radio wave from the transponder, extracts and outputs the mobile object identification information. An interrogator or a receiver that extracts and outputs mobile object identification information when receiving a radio wave from a transmitter is provided. The arrangement is such that it functions as a radio wave reflection element for improving directivity.

According to a third aspect of the present invention, in the first aspect of the present invention, a plurality of street lights are provided with a moving body position detecting means and a transmitting means, respectively. Information for notifying the position of the road light, time information, etc. are received via a communication line, and the moving direction and moving speed of the moving body are calculated from the information to estimate and output the current position of the moving body. is there.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a circuit configuration of a street lamp. A lighting circuit 2 for controlling the lighting of a lamp 1 and the lighting circuit 2 are monitored to determine whether the lamp 1 or the lighting circuit 2 has failed. An interrogator 5 that emits an interrogation radio wave from the failure detection circuit 3 and the antenna 4 to detect and receives a response radio wave from the transponder to be described later, and demodulates a received signal when the antenna 4 receives the response radio wave. The interrogator 5 is controlled by the failure detection circuit 3 and the interrogator 5. And a telephone line modem 6 for transmitting information via a telephone line. The lighting circuit 2, the failure detection circuit 3, the interrogator 5, and the telephone line modem 6 receive power from an external power supply wiring.

As shown in FIG. 2, the interrogator 5 includes two dipole antennas, a transmitting dipole antenna 4a and a receiving dipole antenna 4b, as the antenna 4, and the transmitting dipole antenna 4a is connected to the transmitting unit 11. The receiving dipole antenna 4 b is connected to the receiving unit 12. The transmitting unit 11 and the receiving unit 12 are controlled by a control unit 13 including a microcomputer.

That is, the transmission unit 11 is controlled by the control unit 13 and intermittently operates at a frequency of about 10 times per second.
A carrier wave of 0 mW is output to the transmitting dipole antenna 4a as an interrogation radio wave. The receiving unit 12
When the receiving dipole antenna 4b receives the response radio wave, the receiving device demodulates the received signal from the receiving dipole antenna 4b and supplies the demodulated data to the control unit 13. The control unit 13 supplies the demodulated data from the receiving unit 12 to the telephone line modem 6, and controls the modem 6 to transmit the demodulated data to the telephone line. When the modem 6 receives a command from a terminal device connected to a telephone line, which will be described later, the control unit 13 receives the command from the modem 6 and sends the command to the transmitting unit 1.
1 controls the start and stop of intermittent transmission of interrogation radio waves. The control unit 13 has a clock circuit that stores its own ID code in an internal memory and measures time.

FIG. 3 shows a passive reflection type transponder 20 for receiving an interrogation radio wave from the interrogator 5.
1 and rectified to a direct current by the detector 22, and then converted to a stabilized voltage by the voltage stabilizing circuit 23.
(Central processing unit) 24, ROM (read only memory) 25, and high frequency switch 26 are supplied as power.

When the CPU 24 receives the supply of the stabilizing voltage from the voltage stabilizing circuit 23, the CPU 24 reads an ID (identification) code, which is a digital code stored in the ROM 25, and reads "0" and "1" of its contents. The high-frequency switch 26 is controlled to open and close according to the bit string of "."
For example, when the bit is “0”, the switch is opened, and when the bit is “1”, the switch is closed.

When the high-frequency switch 26 is open, the feed point impedance of the dipole antenna 21 and the input impedance of the detector 22 match, so that the power reflection at the connection point between the two is small and the received power Are transmitted to the detector 22 and the voltage stabilizing circuit 23. When the high-frequency switch 26 is closed, the feed point of the dipole antenna 21 is short-circuited, so that an impedance mismatch state occurs. The high-frequency power captured by the antenna 21 undergoes total reflection at this short-circuit point, and the antenna 21 returns again. To be re-radiated from the antenna 21 to the space. This is received by the interrogator 5 as a response radio wave. This response radio wave is ASK (Amplitude Shyft Keying) according to the ID code of the transponder 20.
Modulated.

FIG. 4 shows a modification of the transponder, which is a battery-operated retransmission transponder 30. The transponder 30 includes three antennas of an interrogation radio wave detection dipole antenna 31, a reception dipole antenna 32, and a retransmission dipole antenna 33 which are formed in a printed pattern as antennas.
The interrogating radio wave from the interrogator 5 is received by the interrogating radio wave detecting dipole antenna 31, converted into a DC voltage by the detector 34, and compared with a reference value by the detecting unit 35. The detection unit 35
Detects the reception of the interrogation radio wave when the level of the DC voltage is equal to or higher than the reference value, and outputs a detection signal to the CPU
To supply.

The CPU 36 reads an ID code from a ROM (Read Only Memory) 37,
The code is supplied to the modulator 38 as a serial bit string.
The modulator 38 ASK-modulates a high-frequency signal obtained by the receiving dipole antenna 32 receiving the interrogation radio wave according to the bit string, and emits the re-transmission dipole antenna 33 as a response radio wave. The transponder 30 incorporates a battery 39, and the detection unit 35, C
Power is supplied to the PU 36, the ROM 37, and the modulation unit 38, respectively.

As shown in FIG. 5, the transponder 20 or 30 is provided with a dipole antenna and each of the dipole antennas in a plate-like resin casing 41 having a thickness of about 4 mm and protruding in a triangular shape at both longitudinal ends. The circuit board 42 on which the circuit portion is formed is embedded, and snap buttons 43a and 43b for fixing to a clothes or the like are attached to the triangular protrusion.

FIG. 6 is a diagram showing the configuration of the entire system.
A street light 53 is fixed to a power pole 52 supporting a transmission line 51, and the street light 53 is connected to the pole transformer 5 from the transmission line 51.
4 and a branch box 56
Is connected to the telephone line 57 via the. The telephone line 57 is connected to a terminal device 59 via a public line network 58.
The circuit configuration of the street light 53 is as shown in FIG. When the interrogator 5 built in the street light 53 transmits an interrogation radio wave, and a mobile body, for example, a person wearing the transponder 60 passes under the street light 53, the interrogator 5 The response radio wave modulated by the ID code can be received. The circuit configuration of the transponder 60 is shown in FIG.
It has a configuration shown in FIG.

The terminal device 59 is, as shown in FIG.
The personal computer 61 has a keyboard input device 62, C
The RT display 63 and the modem device 64 are connected, and the modem device 64 communicates with the telephone line modem 6 of the street light 53 via the telephone line.

The street light 53 is, for example, shown in FIG.
As shown in (b), the lamp 1 and the circuit unit 67 are provided in a housing composed of a reflection plate 65 and a glass hood 66. The circuit unit 67 houses the lighting circuit 2, the failure detection circuit 3, the interrogator 5, and the telephone line modem 6. Then, the dipole antenna 4 is connected to the reflecting plate 6.
5 and lamp 1. Thus, the reflection plate 65 acts to bias the directivity of the dipole antenna 4 toward the surface on the glass hood 66 side. The dipole antenna 4 and the circuit unit 67 are connected by a semi-rigid cable 68. The cable is not limited to the semi-rigid cable 68 but may be any cable made of a material that can withstand the heat from the lamp 1.

FIGS. 9 (a) and 9 (b) show a modification of the street light, which is a dipole antenna 4 having a slightly thicker glass hood 6.
9, a dipole antenna 4 and a circuit unit 6
7 are connected by a parallel transmission line 70 also buried in the glass hood 69.

In such a configuration, when a search request for a specific person wearing the transponder 60 occurs, the search range is specified based on the search requester's information from the keyboard input device 62 of the terminal device 59. Enter information. As the input information, for example, information indicating a regional constituent unit such as a town name or a ward name is used. If the search range cannot be specified, the entire area is designated collectively as input information.

When information on the search range is input from the keyboard input device 62, the personal computer main unit 61 controls the modem device 64 to sequentially search all the street lights 53 within the search range via the public network 58. Send the operation start command. The designation of the street light 53 in this case is performed by designating the ID code stored in the control unit 13. The interrogator 5 of the street lamp 53 that has received the search operation start command performs an emission operation of the interrogation radio wave and a standby reception operation of the response radio wave.

In this state, when the person wearing the transponder 60 passes under the street light 53, the transponder 60 receives the interrogation radio wave from the interrogator 5 and emits the response radio wave modulated by the ID code. I do. When the interrogator 5 receives the response radio wave, the interrogator 5 detects the ID code from the response radio wave, and transmits the three pieces of information of the transponder ID code, the current time, and the ID code of the interrogator 5 as a series of data from the modem 6 to the telephone network. It transmits to the terminal device 59 via 58. Thus, the terminal device 59 can know when and under what street light 53 the search target person has passed. Therefore, the search position can be specified by displaying the map of the corresponding area on the CRT display 63 and displaying the corresponding part with the mark.

In this position detecting system, the configuration of the transponder 60 can be made very small and lightweight, and portable at all times. And it becomes possible to sew on people's clothes,
Loss of the transponder 60 can also be prevented. In addition, since the response radio wave emitted from the transponder 60 is extremely weak, there is no possibility that the response pacer will adversely affect the cardiac pacemaker.

Further, there is no restriction such as a wireless connection state with a base station such as a PHS or a reception state of a satellite radio wave such as a GPS.
By entering 0, reliable detection can be performed. In addition, since a general user does not carry the device unlike the PHS, the problem of privacy infringement caused by searching for a current position of an unrelated general user does not occur.

Further, since the directivity of the dipole antenna 4 of the interrogator 5 is biased toward the surface of the glass hood 66 using the reflector 65 of the street light 53, the transponder 60 is provided below the street light 53. When passing, the interrogation radio wave can be reliably transmitted to the transponder 60, and the response radio wave from the transponder 60 can be reliably received.

Further, in this position detecting system, the current position of the person to be searched can be accurately estimated from the moving direction and the moving speed. That is, assuming that the search target person wearing the transponder 60 passes the position of the street light a at the time Ta and then passes the position of the street light b at the time Tb, the terminal device 59 sets the The ID code of the transponder 60, the time information Ta, and the ID code of the street light a are received from the interrogator 5,
The ID code of the transponder 60, the time information Tb, and the ID code of the street light b are received from the interrogator 5 of the street light b. If the distance D between the street lights a and b is stored in the terminal device 59 in advance,
The moving direction is estimated to be a direction connecting the direction of the street light a to the street light b with a straight line. The moving speed is D / (Tb-T
Determined by a).

Then, assuming that the current time is Tc, the search target person is detected at the point of the street light b and the current time (Tc
−Tb) has elapsed, and the current position of the search target person is a distance (Tc−Tb) from the street light b on a straight line extending from the street light a to the street light b. ×
It can be estimated that the point is separated by {D / (Tb−Ta)}.

Then, the terminal device 59 designates, for example, a radius of 50 m from the position of the estimated current position as a new search range, and transmits a search operation start command to the street lamp 53 within the search range. In this manner, the search range can be narrowed, and the current position of the search target person can be accurately estimated.

(Second Embodiment) FIG. 10 is a block diagram showing a circuit configuration of a street light. A lighting circuit 72 for controlling the lighting of a lamp 71, and the lighting circuit 72 is monitored to monitor the lighting circuit 72.
A failure detection circuit 73 for detecting a failure of the lighting circuit 72 or the lighting circuit 72;
It comprises a receiver 75 to which a receiving antenna 74 is connected, a failure detection circuit 73, and a telephone line modem 76 controlled by the receiver 75 to transmit information via a telephone line. The lighting circuit 72, the failure detection circuit 73, the receiver 75, and the telephone line modem 76 are supplied with power from an external power supply wiring.

FIG. 11 shows a circuit configuration of a transmitter worn by a person who is a moving body. This transmitter is provided with an oscillation multiplier 81 for performing oscillation multiplication by a crystal oscillator. To 320 MHz are supplied to the ASK modulator 82. Also, a CPU (Central Processing Unit) 8
The ID code stored in a ROM (read only memory) 84 is read out by the CPU 83 and supplied to the ASK modulator 82 as a serial bit string.
The ASK modulator 82 ASK modulates the carrier from the oscillation multiplying circuit 81 with the ID code from the CPU 83, amplifies the modulated signal with the high frequency amplifier 85, and emits the modulated signal from the transmission loop antenna 86 to space. .

This transmitter has a battery 87 provided therein, and the voltage of the battery 87 is supplied to the oscillation multiplying circuit 81, ASK modulator 82, CPU 83, and R via an intermittent operation control circuit 88.
OM 84 and high frequency amplifier 85 are supplied to each section. The intermittent operation control circuit 88 sets the battery voltage to 0.
It is supplied intermittently with a duty cycle of 50 ms every 5 seconds. Therefore, this transmitter has an ID of 50 ms
After emitting the radio wave modulated by the code, the operation of stopping for 0.5 second is repeated. The transmitter is incorporated in a resin housing to which a snap button shown in FIG. 5 is attached, similarly to the above-described transponder.

The receiver 75 is, as shown in FIG.
A 320 MHz radio wave from the transmitter is received by the receiving antenna 74 constituted by a dipole antenna, and a received signal is amplified by a low noise amplifier 91 and then a frequency converter 92
To supply. The frequency converter 92 mixes the received signal with a local oscillation signal of 320.455 MHz from the local oscillator 93, converts the frequency to an intermediate frequency of 455 KHz, and supplies the intermediate frequency signal to the demodulator 94. The demodulator 94 demodulates the intermediate frequency signal into an analog detection signal and supplies the analog detection signal to a binarization circuit 95. The binarizing circuit 95 compares the analog detection signal with a threshold voltage to obtain a binary signal.
The data is digitized, a digital ID code is extracted, and supplied to the microcomputer 96. The microcomputer 96 supplies an ID code to the telephone line modem 76. The microcomputer 96 starts and stops a receiving operation by receiving an instruction from the modem 76. The microcomputer 96 has its own ID inside.
A clock circuit that stores the code and measures the time is provided.

FIG. 13 is a view showing the configuration of the entire system. A street light 97 is fixed to a power pole 52 supporting a transmission line 51, and the street light 97 is connected to the street light 97 from the transmission line 51 via a pole transformer 54. Connect power wiring 55 and branch box 5
6, a telephone line 57 is connected. Telephone line 57
Is connected to a terminal device 59 via a public line network 58. The circuit configuration of the street light 97 is as shown in FIG. Then, when a person who is a moving body wearing the transmitter 98 passes under the street light 97, the receiver 75 can receive the high frequency signal modulated by the ID code from the transmitter 98. The circuit configuration of the transmitter 98 is as shown in FIG. The configuration of the street light 97 is the same as that of the street light 53 of the first embodiment, as shown in FIG. 8 or FIG. Further, the terminal device 59
Has the configuration shown in FIG.

In this configuration, when a search request for a specific person wearing the transmitter 98 occurs, the search range is specified from the keyboard input device 62 of the terminal device 59 based on the search requester's information. Enter information. As the input information, for example, information indicating a regional constituent unit such as a town name or a ward name is used. If the search range cannot be specified, the entire area is designated collectively as input information.

When information on the search range is input from the keyboard input device 62, the personal computer main unit 61 controls the modem device 64 to sequentially search all the street lights 97 within the search range via the public network 58. Send the operation start command. The designation of the street light 97 in this case is performed by designating the ID code stored in the microcomputer 96. The microcomputer 96 of the street light 97 that has received the search operation start command starts a reception operation capable of receiving a radio wave from the transmitter 98.

In this state, when a person wearing the transmitter 98 passes under the street light 97, the receiver 75 is turned on by the transmitter 98.
, And the received signal is frequency-converted to an intermediate frequency by a frequency converter 92, demodulated to an analog detection signal by a demodulator 94, and further converted to a binary signal by a binarization circuit 95.
The digital ID code is obtained by converting the value into a digital value, and this ID code is supplied to the microcomputer 96. The microcomputer 96 transmits the received three information of the ID code of the transmitter 98, the current time, and the ID code of the street light 97 as a series of data from the modem 6 to the terminal device 59 via the telephone network 58. Thus, the terminal device 59 can know when and under what street light 97 the search target person has passed. Therefore, the search position can be specified by displaying the map of the corresponding area on the CRT display 63 and displaying the corresponding part with the mark.

Therefore, also in this position detection system, as in the first embodiment, the configuration of the transmitter 98 can be made extremely small and lightweight, and it can be easily carried at all times. And it becomes possible to sew on the clothes of a person, and it is possible to prevent the transmitter 98 from being lost. Further, since the radio wave emitted from the transmitter 98 is extremely weak, there is no possibility that the radio wave emitted from the transmitter 98 will adversely affect the cardiac pacemaker.

Further, there is no restriction such as a radio connection state with a base station such as PHS or a reception state of satellite radio waves such as GPS, and the transmitter 98 is set within a range where the receiver 75 can receive radio waves.
Can be detected reliably. In addition, since a general user does not carry the device unlike the PHS, the problem of privacy infringement caused by searching for a current position of an unrelated general user does not occur.

Further, since the directivity of the dipole antenna 74 of the receiver 75 is biased toward the surface on the glass hood side by using the reflector of the street light 97, the transmitter 98 passes under the street light 97. At times, the radio waves from the transmitter 98 can be reliably received. Also, the current position of the search target person can be accurately estimated from the moving direction and the moving speed.

In each of the above-described embodiments, a person is used as a moving body. However, the present invention is not limited to this, and a wheelchair or a car may be used. The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0048]

As described above, according to the first to third aspects of the present invention, it is possible to reduce the size and weight of equipment to be arranged on a moving body such as a person.
Therefore, it can be easily carried at all times, has no adverse effect on the cardiac pacemaker, and can reliably detect the position of the moving object without any restrictions such as the state of wireless connection with the base station and the state of receiving satellite radio waves. . Further, according to the invention described in claim 2, the detection of the moving object can be more accurately performed.
According to the third aspect of the present invention, the current position of the moving object can be further accurately estimated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a street light according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a circuit configuration of a streetlight interrogator in the embodiment.

FIG. 3 is a block diagram showing a circuit configuration of a passive reflection type transponder which is an example of the transponder used in the embodiment.

FIG. 4 is a block diagram showing a circuit configuration of a battery-powered retransmission-type transponder which is a modification of the transponder used in the embodiment.

FIG. 5 is an exemplary perspective view showing the appearance of a transponder used in the embodiment;

FIG. 6 is a diagram showing a configuration of the entire position detection system according to the embodiment;

FIG. 7 is a block diagram showing a configuration of a terminal device used in the embodiment.

FIG. 8 is a cross-sectional view showing a configuration of an example of a street light used in the embodiment and a plan view seen from below.

FIG. 9 is a cross-sectional view and a plan view seen from below showing a configuration of a modification of the street light used in the embodiment.

FIG. 10 is a block diagram showing a circuit configuration of a street light according to a second embodiment of the present invention.

FIG. 11 is a block diagram showing a circuit configuration of a transmitter used in the embodiment.

FIG. 12 is a block diagram showing a circuit configuration of a receiver used in the embodiment.

FIG. 13 is a diagram showing a configuration of the entire position detection system in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lamp 2 ... Lighting circuit 3 ... Failure detection circuit 4 ... Antenna 5 ... Interrogator 6 ... Modem for telephone lines 20, 30, 60 ... Answering machine 53 ... Street light 59 ... Terminal device

Claims (3)

[Claims] 1. A street light for receiving a power supply from a power supply line, lighting a lamp and transmitting failure information via a communication line when a failure occurs, a mobile body having a source of mobile body identification information, A moving body position detecting unit that is installed at the same position as the street light, receives power supply from the power supply wiring, receives moving body identification information from the moving body, and detects the position of the moving body; Transmitting means for automatically transmitting, via the communication line, moving body identification information, information for informing the position of the street light, time information, etc. based on the moving body position detection information from the means, and connecting to the communication line. And a terminal device for receiving and outputting information from the transmitting means. 2. The mobile unit, when receiving an interrogation radio wave from the interrogator, emits a response radio wave including the mobile identification information or a transmitter that spontaneously emits a radio wave including the mobile identification information. The moving object position detecting means emits an interrogation radio wave, receives the response radio wave from the transponder, extracts the moving object identification information, outputs the interrogator, or receives the radio wave from the transmitter, and moves. A receiver for extracting and outputting body identification information is provided, and the antenna element of the interrogator or the receiver is arranged so that the illumination light reflecting member of the street light functions as a radio wave reflecting element that enhances the antenna directivity toward the road surface. The moving object position detection system according to claim 1, wherein: 3. A plurality of street lights are provided with a moving body position detecting means and a transmitting means, respectively. The terminal device transmits moving body identification information, information for notifying the position of the street lights, time information, and the like from each transmitting means. 2. The moving object position detection according to claim 1, wherein the moving object is received through a communication line, and the moving direction and moving speed of the moving object are calculated from the information to estimate and output the current position of the moving object. system.