Wavetronix VDR24 Radar User Manual

Page 65

Support, Maintenance, Troubleshooting

VDR24 Radar Detection System, Rev. 1.0

Under normal operation the percentage of received and validated messages should always be

100%. If it is not, then the integrity and condition of the communication cables, junction box

interconnections, need to be examined. If the cable is intact and in good condition, and

interconnections are satisfactory, then there may be something related to the radar sensor itself

that requires further examination. In this case contact island Radar engineering and support for

guidance.
9.1.4. Examination of Performance Metrics
The front panel display provides a number of operating metrics to help verify proper operation.

The two key metrics involve and verify proper communication between the VDR24 and the radar

sensors, and proper ‘tracking’ of each of the radars in applications where both radars are

configured to detect vehicles in the same zones, but viewed from different sides of the crossing

(or crossover).
9.1.5. 9.1.5 Detection Levels
In most crossing applications, both radars are configured to detect vehicles in identical zones on

the crossing island, but from different sides of the crossing in order to provide optimal redundant

detection performance. Although both radars will detect each vehicle in the crossing area, the

exact timing or each detection and release will not be identical. Moreover, there are cases

where a particular vehicle may not

precisely occupy a specific lane of traffic,

especially in cases where there is a

turning lane before or after the crossing.

While the exact number of detection

events for each independent radar swill

not be the same, but over time a typical

percentage of “co-incident” detections will

be established for the traffic patterns at a

particular crossing.
This tracking percentage between the

two radar sensors is important because

any physical movement of a radar sensor

will alter its detection zone location – and

cause the typical tracking percentage for

a site to change abruptly.

Navigating to screen 3.1 will display the

running total of detections for each radar

and for each zone. Tests have shown

that the two radars, properly configured,

should track each other with a percentage higher that 90%. Any change in physical position can

be identified because the tracking percentage, which should be constant over time, will degrade.

This is an indication that the physical position of the radar sensor and/or the configured zones

should be re-examined as instructed in Section 8 of this document.
9.1.6. Verification of Radar Alignment (Visual)
As instructed during the initial installation of the radar sensors in Section 4.3, verify that the

radar sensors are visually aligned with the roadway, the gates, and exceed the width of the

overall detection area (including all zones).

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