Wavetronix SMARTSENSOR 105 Instrukcja Użytkownika Pobierz pdf (Strona 7)

SmartSensor 105

10.0 Data Buering. The RVSD shall store, in non-volatile

memory, at least 2,400 interval data packets with the maxi-

mum number of lanes congured.

11.0 Radar Design.

11.1 Frequency Stability. The circuitry shall be void of

any manual tuning elements that could lead to human

error and degraded performance over time.

All transmit modulated signals shall be generated by

means of digital circuitry, such as a direct digital synthe-

sizer, that is referenced to a frequency source that is at

least 50 parts per million (ppm) stable over the specied

temperature range, and ages less than 6 ppm per year.

Any upconversion of a digitally generated modulated

signal shall preserve the phase stability and frequency

stability inherent in the digitally generated signal.

This specication ensures that, during operation, the RVSD

strictly conforms to FCC requirements and that the radar signal

quality is maintained for precise algorithmic quality. Analog

and microwave components within an RVSD have character-

istics that change with temperature variations and age. If the

output transmit signal is not referenced to a stable frequency

source, then the RVSD is likely to experience unacceptable

frequency variations which may cause it to transmit out of its

FCC allocated band and thus will be non-compliant with FCC

regulations.

The RVSD shall not rely on temperature compensation

circuitry to maintain transmit frequency stability.

Temperature-based compensation techniques have been shown

to be insucient to ensure transmit frequency stability. One

reason this type of technique is not sucient is that it does not

compensate for frequency variations due to component aging.

The bandwidth of the transmit signal of the RVSD shall

not vary by more than 1% under all specied operating

conditions and over the expected life of the RVSD.

The bandwidth of an RVSD directly aects the measured range

of a vehicle. A change in bandwidth causes a direct error in the

measured range, i.e., a 5% change in bandwidth would cause a

range error of 10 ft. (3 m) for a vehicle at 200 ft. (61 m). If the

bandwidth changes by more than 1% due to seasonal tempera-

ture variations and component aging, then the RVSD will need

to be frequently recongured to maintain the specied accuracy.

11.2 Antenna Design. The RVSD antennae shall be de-

signed on printed circuit boards.

Printed circuit board antennae eliminate the need for RF con-

nectors and cabling that result in decreased reliability. Printed

circuit antennae are less prone to physical damage due to their

extremely low mass.

The vertical beam width of the RVSD at the 6dB points of

the two-way paern shall be 65 degrees or greater.

This enables the RVSD to provide simultaneous detection from

a lane located at the minimum oset and a lane located at the

maximum range. The vertical beam width of an RVSD deter-

mines the eld of view in which it can detect trac. If the eld

of view is smaller than the distance between the minimum oset

and the farthest range, then the RVSD will be unable to detect

vehicles over the entire range. A vertical beam width of less than

65 degrees will not allow an RVSD, mounted at a typical height

of 17 ft. (5.2 m), to simultaneously detect and report informa-

tion when the lanes are positioned from the minimum oset of 9

ft. (2.7 m) to the maximum range of 200 ft. (61 m).

The horizontal beam width of the RVSD at the 6dB points

of the two-way paern shall be 11 degrees or less.

A narrow horizontal beam width allows the RVSD to resolve ve-

hicles at the farthest ranges. If the horizontal beam width is too

large, a trailing vehicle may be merged with the vehicle in front.

The sidelobes in the RVSD two-way antenna paern shall

be -40dB or less.

Low sidelobes ensure that the performance from the antenna

beam widths is fully achieved.

11.3 RF Channels. The RVSD shall provide at least 4 RF

channels so that multiple units can be mounted in the

same vicinity without causing interference between them.

12.0 Conguration.

12.1 Auto-conguration. The RVSD shall have a method

for automatically dening trac lanes or detection zones

without requiring user intervention. This auto-cong-

uration process shall execute on a processor internal to

the RVSD and shall not require an external PC or other

processor.

The auto-conguration process shall automatically dene

trac lanes or detection zones by detecting the relative

position of vehicles within the RVSD’s eld of view.

The RVSD shall include a transceiver capable of detect-

ing multiple vehicles present within its eld of view. The

RVSD shall also include a processor or computer with

executable instructions that estimates the position of each

of the vehicles, records the position of the vehicles, gener-

ates a probability density function estimation from each

position of the vehicles, and denes trac lanes from that

probability density function estimation. The probability

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