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Validation checking in traffic monitoring equipment
| Details |
Inventors: Gebert, Franz J.; Gebert, Rudiger H.; Gebert, Ralf D. H.;
Assignee:
Primary Examiner: Crosland; Donnie L.
Assistant Examiner:
Attorney, Agent or Firm: Ladas & Parry
Traffic monitoring equipment including traffic speed measuring equipment has a signal validation facility incorporated to enhance reliability of the equipment. This facility permits the monitoring operation, for example speed measurement, to proceed only if the validation is positive, if negative the operation is aborted and/or a warning signal or shutdown is activated. Validation is made of pulse sequence, pulse strength, radio frequency interference, insulation breakdown, cable integrity (where cables are used) and the like. |
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DETAILED DESCRIPTION One object of the present invention is to check the correct sequence of impulses derived from several cables, a single cable and/or a sensor pad or other sensor according to the set up of the equipment.
This can be a security against, for example, swopping errors, incorrect connection of cable to the equipment after the cables have been set out in a suitable array on a road surface, for example in the case of a duplicated pair of cables extended across the full width of a road in a spaced parallel array for speed law enforcement.
Here the correct sequence of pulses, for an array ABCD in that order on the road, will be cable A, then cable B followed by cable C and then cable D or, the reverse sequence for traffic in the opposite direction on the other side of the road being, cable D then cable C, then cable B and then cable A.
In this way the speed checking is done by independent time measuring devices, i.
e.
instrument L function measures the time from cable A to cable C independently of the instrument 2 which measures from cable B to cable D, each on either the front or the back axles or any other axles in physical contact with the road.
This verification can also have, for example, application in measurement of deceleration and acceleration and vehicle travel direction.
Any pulse sequence other than these will be rejected for data processing purposes by the instrument as a result of this validity checking facility.
An incorrect sequence of pulses can also be caused by defective or damaged cables or improperly installed cables resulting in "missing" or "additional" pulses being detected in a sequence of pulses, e.
g.
A C D or A B B C D.
This abnormal sequence will be rejected as mentioned before.
A single or spurious signal occurring will be rejected if the rest of the sequence has not been validated within a certain time.
The above sequences were used as an example only.
Other arrays (e.
g.
consisting of three cables) or other sequences or automatic sequence detection may also be implemented
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