Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Instrukcja Użytkownika Strona 90
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CHAPTER 7 CHANNELS-ALERTS-ZONES 89
Figure 7.28 – Dynamic Density Filter
Dynamic Density allows the SS200 to generate outputs based on trac eciency. e three
lter elements (Headway, % Utilization, and Tuning Factor) are combined with the size of
the zone and the average speed of qualied detections to create a detection density thresh-
old that changes with the uctuations in detected trac.
Headway refers to the time separation of the front edge of two consecutive vehicles travel-
ing in a given lane. e headway metric is inversely proportional to the ow rate of a given
lane and is widely used as a measure of how eciently trac is owing in a given lane.
A typical headway value for heavily traveled lanes is two seconds, which corresponds to a
ow rate of 1800 vehicles per hour. In the Dynamic Density settings, the minimum head-
way value is 0.1 seconds and the maximum headway value is 10.0 seconds.
% Utilization refers to the ratio of observed ow rate to ideal ow rate. It is a measure used
to describe trac eciency in terms of the ideal eciency. In the Dynamic Density set-
tings, the minimum utilization value is one percent and the maximum utilization value is
100 percent.
Note
Consider a case where a lane is operating at the lower bounds of acceptable eciency
when only 75 percent of it’s ideal flow rate was realized. If the ideal flow rate were
1800 vehicles per hour, then the lane is being used adequately at a flow rate of 0.75 *
1800 vehicles/hour = 1350 vehicles/hour (or a headway of 2.67 seconds).
e Tuning Factor is a general-purpose scale factor used to adjust observed results to rep-
resent actual road conditions. e tuning factor resides in the numerator of the Dynamic
Density equation. e initial recommendation for the tuning factor value is to set it equal
to the number of lanes being observed by the sensor. e minimum tuning value is 0.1 and
the maximum tuning value is 10.0.
- SmartSensor Advance 1
- SmartSensor 2
- Contents 4
- Introduction 6
- SmartSensor Advance Package 7
- Selecting a Detection Method 7
- Selecting a Mounting Location 8
- Installing the SmartSensor 14
- Selecting the Mounting Height 16
- Mounting the Sensor 17
- Distance 18
- Oset (perpendicular) 18
- Aligning the Sensor 20
- Figure 1.9 – Viewpoint 1 21
- Using the Viewfinder 22
- To target 23
- Figure 1.12 – Viewpoint 1 23
- Grounding the Sensor 26
- Connecting Power and 28
- Surge Protection 2 28
- Mounting the Backplate 29
- Connecting AC Power 29
- Push this button to 32
- (see Figure 2.8) 35
- Contact Closure Connections 37
- Using SmartSensor Manager 38
- Advance 3 40
- Figure 3.3 – Shortcut Options 42
- Communication 4 44
- Serial Connection 45
- Internet Connection 46
- Virtual Connection 47
- Virtual Sensor File 48
- Selecting a Tracker Log File 49
- Multi-drop Network 50
- Address Book 51
- Check Hardware 53
- Communication Error Log 54
- Sensor Settings 5 58
- Figure 5.2 – General Tab 59
- Communication Tab 60
- Sensor Configuration 6 62
- 1. Installation Details 63
- Positioning the Sensor 64
- 3. Manual Radar Adjustment 66
- Editing Sensitivity 67
- Changing the PGA 70
- Channels-Alerts-Zones 7 72
- Channels 73
- Channel 1 74
- Priority Channel 75
- Pulse Channel 78
- Normal Channel 80
- Latched Channel 82
- Enabling an Alert 85
- Logic (OR/AND) 85
- Inverted Zones 85
- Range (ft) 86
- Speed (mph) and ETA (s) 87
- Right Sidebar 93
- (All) Channels 94
- Individual Channel 95
- Channel LED 97
- Zone LED 98
- Alert LED 98
- Roadway Display 99
- Qualified Count 102
- Dynamic Density 103
- Tri-view 104
- Tracker Highlighting 105
- Left Sidebar 107
- Figure 8.24 – Log File 109
- Figure 8.25 – Pulse Log File 109
- In this chapter 110
- Primary Push Manager 111
- Specify output frequency 112
- Secondary Push Manager 113
- Templates 10 116
- Creating a Channel Template 117
- Importing a Channel Template 117
- 118 CHAPTER 10 TEMPLATES 119
- Tools 11 120
- Backup/Restore Tool 121
- Restoring the Configuration 122
- Restoring to Factory Defaults 123
- Beam Alignment Tool 124
- Serial Terminal 125
- Rack Card Tools 126
- Using the Rack Card Tool 127
- Firmware Version 128
- Signal Cards Switch 128
- Channel Outputs Switch 128
- Fail Safe Mode 133
- Rack Card Dip Switch 133
- Click 104 Configuration 135
- Appendix 138
- Creating Custom Cables 139
- Appendix B – Cable Lengths 140
- APPENDIX 143 144
- APPENDIX 145 146
- 146 APPENDIX 147
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