WO1999030303A1 - System for warning of traffic incidents - Google Patents
System for warning of traffic incidents Download PDFInfo
- Publication number
- WO1999030303A1 WO1999030303A1 PCT/NO1998/000299 NO9800299W WO9930303A1 WO 1999030303 A1 WO1999030303 A1 WO 1999030303A1 NO 9800299 W NO9800299 W NO 9800299W WO 9930303 A1 WO9930303 A1 WO 9930303A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pulses
- duration
- chosen
- radio
- frequency range
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0965—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages responding to signals from another vehicle, e.g. emergency vehicle
Definitions
- This invention relates to a system for warning of traffic incidents, especially the approach of emergency vehicles .
- sirens are often used to warn a nearby driver of a possibly dangerous situation.
- an approaching emergency vehicle such as an ambulance.
- the ambulance is delay, with possible fatal results.
- dangerous traffic conditions may arise where an unwarned driver obstructs an emergency vehicle which is often travelling at high speed.
- Several systems have been suggested in order to warn the drivers of a dangerous situations in the traffic, many of them comprising radio transmitters positioned in an emergency vehicle.
- Receivers adapted to detect the generated signal are provided in ordinary vehicles, so that the receiver may generate a signal warning the driver. Examples of such systems are described in the following patents: US 4,238,778, US 4,403,208, and US 4,764,978.
- It is an object of this invention to provide a system for warning of traffic incidents comprising a radio transmitter adapted to be positioned in a first vehicle and a radio receiver adapted to be positioned in second vehicle, characterized as described in claim 1.
- the invention provides a system for transmitting signals from e.g. an emergency vehicle to a driver using radio signals, but without occupying a radio frequency, as the pulsed signal does not disturb normal radio signals. This way the same frequency range may be used everywhere, making both the transmitters and the receivers simple and possible to produce at low costs.
- FIG. 1 shows schematically a diagram of a transmitter according to the invention.
- Figure 2 shows schematically a diagram of a receiver according to the invention.
- the transmitter unit in figure 1 comprises a oscillator 1, preferably being of a high stability, temperature compensated type. It may be a synthesized solution with a stable reference oscillator or a crystal oscillator with a frequency multiplier.
- the circuit also contains an amplifier which brings the radio frequency (RF) signal to a level required by the power amplifier 5. Normally the oscillator 1 will work continuously while the transmitter unit is turned on.
- RF radio frequency
- the frequency of the signal generated by the oscillator may be chosen from a wide range. In a preferred embodiment the frequency is approximately 750MHz.
- a radio frequency (RF) switch 2 is controlled by a control/timer unit 3 through a connection 4, and makes sure that the RF signal from the oscillator only reaches the power amplifier in short bursts.
- the isolation through the switch between the bursts must be high enough to satisfy the EMC requirements of this kind of equipment .
- the RF switch 2 may comprise one or more monolithic RF switch circuits of any suitable type, or may be based on discrete solutions with PIN diodes etc.
- the ratio between the duration of each pulse, and the interval between the pulses may in the order of 1/10000.
- the pulses may have a duration of lOO ⁇ s and be sent at Is intervals. This may, however, be varied to a large degree. It is also possible to distinguish between different types of transmitters, e.g. positioned in different types of vehicles, by changing this ratio, the duration of each pulse, and/or the interval between the pulses according to the vehicle it is to be position in, or the warning to be sent. Thus a driver may be able to distinguish between an ambulance, a police car or another type of traffic incident.
- the RF power amplifier 5 may be of any suitable type, based on monolithic, hybrid or discrete circuits. It must be capable of providing a sufficient level of RF signal to give the signal a sufficiently large range.
- the range may be in the order of 100 metres, depending of the intended use. The range will of course also depend on the receivers, as well as the antenna.
- control unit/timer unit 3 controls the RF switch through the timer output 4 and thus the timing of the signal bursts, as well as the optional DC switch 6, also connected to the timer output 4, which in turn controls the RF power amplifier 5.
- the control/timer unit also provides other parts of the transmitter unit with necessary power through the connections 8, and may be connected with conductors 10 to the battery of the vehicle.
- the antenna 9 may be of any suitable kind, directive or not, depending on the intended use.
- the transmitter may be implemented in other cars or in warning signs for use in especially dangerous situations.
- the transmitter may be contemplated mounted in ordinary cars connected to a detector adapted to detect collision, such as the ones used in air bags. This way the transmitter is started at once, warning other drivers of an accident at the movement it happens.
- Receivers positioned along dangerous parts of the road may detect accidents and transmit the signal to the police, the nearest hospital etc, thus saving time and perhaps lives.
- Figure 2 shows schematically the receiver unit according to a preferred embodiment of the invention.
- An antenna 11 of any type capable of receiving signals within the chosen frequency range is connected to a RF filter 12.
- the RF filter discriminates the wanted radio frequency from interfering signals from mobile telephones or other strong signal sources.
- the signal rejection capacity must be so high that no known and expected signal source can reduce the receiver functions significantly. These specifications may be chosen according to the allowed percentage of false alarms.
- the filtered signal is amplified in a RF amplifier 13 to provide a high grade of receiver sensitivity, and is mixed in a mixer 14 with signals from a local oscillator 15.
- the resulting, intermediate frequency (IF) may be chosen to be a relatively low frequency, e.g. 455kHz, where it is easy to detect .
- an image frequency filter in front of the mixer. This is done to make sure that the receiver only has one response frequency. If this is done in the present inven- tion the intermediate frequency (IF) may be chosen to be higher, e.g. 70MHz.
- spurious frequency may be allowed, since the presence of this frequency with sufficient strength to cause malfunctions is considered to be rare.
- the local oscillator may me a synthesized solution with a stable, temperature compensated crystal oscillator with a frequency multiplier.
- the frequency of the oscillator is RF minus IF.
- the mixed signal is filtered in a first IF filter 16, which may comprise ceramic filters with a very high rejection capacity.
- the first IF filter 16 ensure that unwanted signals close to the wanted signals are rejected and do not cause malfunctions or false alarms.
- the signal is then amplified to a detectable level in a suitable amplifier 17.
- Monolithic or discrete amplifiers with low noise factors are preferably used, with an gain preferably in the range of 100-110 dB.
- a second IF filter 18 is provided to filter the signal again before it reaches the detector 19.
- the detector is adapted to rectify and integrate the IF signal, and also to determine if the burst lengths are within allowed tolerances. It may also be adapted to distinguish between different types of signals, in order to give the driver the correct type of warning. If a signal is detected the detector generates a warning signal to a suitable display or an acoustic device, or possibly to a control unit 20.
- the control unit 20 in the receiver has two main functions according to the shown embodiment: to provide the other circuit parts with the required supply voltages, and to generate control signals to indicators when an admitted detection has taken place.
- control units and the detector described here comprises electronic circuits for time measurements and possibly counting of pulses. These circuits are well known and commercially available, and the exact embodiments of them are not essential to this invention.
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Alarm Systems (AREA)
- Circuits Of Receivers In General (AREA)
- Emergency Alarm Devices (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98947994A EP1046149A1 (en) | 1997-12-10 | 1998-10-05 | System for warning of traffic incidents |
AU94664/98A AU9466498A (en) | 1997-12-10 | 1998-10-05 | System for warning of traffic incidents |
BR9813457-4A BR9813457A (en) | 1997-12-10 | 1998-10-05 | Traffic incident warning system |
JP2000524780A JP2001526434A (en) | 1997-12-10 | 1998-10-05 | Warning system for traffic events |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO975802A NO305419B1 (en) | 1997-12-10 | 1997-12-10 | Traffic incident notification system |
NO19975802 | 1997-12-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999030303A1 true WO1999030303A1 (en) | 1999-06-17 |
Family
ID=19901431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1998/000299 WO1999030303A1 (en) | 1997-12-10 | 1998-10-05 | System for warning of traffic incidents |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1046149A1 (en) |
JP (1) | JP2001526434A (en) |
AU (1) | AU9466498A (en) |
BR (1) | BR9813457A (en) |
NO (1) | NO305419B1 (en) |
WO (1) | WO1999030303A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2385185A (en) * | 2002-02-06 | 2003-08-13 | Ian Roland Hill | Emergency vehicle advance warning system |
US9576481B2 (en) | 2015-04-30 | 2017-02-21 | Here Global B.V. | Method and system for intelligent traffic jam detection |
US11295615B2 (en) | 2018-10-29 | 2022-04-05 | Here Global B.V. | Slowdown events |
US12010585B2 (en) | 2021-07-28 | 2024-06-11 | Here Global B.V. | Method, apparatus, and system for identifying mobile work zones |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3673560A (en) * | 1970-05-21 | 1972-06-27 | Aerojet General Co | Vehicle alerting system |
US4626849A (en) * | 1983-07-29 | 1986-12-02 | Sims John C | Proximity detection system |
US4794394A (en) * | 1987-09-08 | 1988-12-27 | Halstead Thomas L | Emergency vehicle proximity warning system |
DE4123857A1 (en) * | 1991-07-18 | 1993-04-08 | Dieckmann Karl Heinz | Vehicle identification appts. for transmission by police vehicle warning - transmits in coded form to be received by private vehicle on board unit with decoder |
-
1997
- 1997-12-10 NO NO975802A patent/NO305419B1/en not_active IP Right Cessation
-
1998
- 1998-10-05 EP EP98947994A patent/EP1046149A1/en not_active Withdrawn
- 1998-10-05 WO PCT/NO1998/000299 patent/WO1999030303A1/en not_active Application Discontinuation
- 1998-10-05 JP JP2000524780A patent/JP2001526434A/en not_active Withdrawn
- 1998-10-05 AU AU94664/98A patent/AU9466498A/en not_active Abandoned
- 1998-10-05 BR BR9813457-4A patent/BR9813457A/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3673560A (en) * | 1970-05-21 | 1972-06-27 | Aerojet General Co | Vehicle alerting system |
US4626849A (en) * | 1983-07-29 | 1986-12-02 | Sims John C | Proximity detection system |
US4794394A (en) * | 1987-09-08 | 1988-12-27 | Halstead Thomas L | Emergency vehicle proximity warning system |
DE4123857A1 (en) * | 1991-07-18 | 1993-04-08 | Dieckmann Karl Heinz | Vehicle identification appts. for transmission by police vehicle warning - transmits in coded form to be received by private vehicle on board unit with decoder |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2385185A (en) * | 2002-02-06 | 2003-08-13 | Ian Roland Hill | Emergency vehicle advance warning system |
US9576481B2 (en) | 2015-04-30 | 2017-02-21 | Here Global B.V. | Method and system for intelligent traffic jam detection |
US9953524B2 (en) | 2015-04-30 | 2018-04-24 | Here Global B.V. | Method and system for intelligent traffic jam detection |
US11295615B2 (en) | 2018-10-29 | 2022-04-05 | Here Global B.V. | Slowdown events |
US12010585B2 (en) | 2021-07-28 | 2024-06-11 | Here Global B.V. | Method, apparatus, and system for identifying mobile work zones |
Also Published As
Publication number | Publication date |
---|---|
NO975802A (en) | 1999-05-25 |
AU9466498A (en) | 1999-06-28 |
EP1046149A1 (en) | 2000-10-25 |
JP2001526434A (en) | 2001-12-18 |
NO305419B1 (en) | 1999-05-25 |
BR9813457A (en) | 2000-10-10 |
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