Wavetronix SmartSensor Matrix Bedienungsanleitung PDF herunterladen (Seite 5)

SmartSensor Matrix

9.1 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 RPD

strictly conforms to FCC requirements and that the radar signal

quality is maintained for precise algorithmic quality. Analog

and microwave components within an RPD have characteristics

that change with temperature variations and age. If the output

transmit signal is not referenced to a stable frequency source,

then the RPD is likely to experience unacceptable frequency

variations which may cause it to transmit out of its FCC allocat-

ed band and thus will be non-compliant with FCC regulations.

The RPD 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 RPD shall not

vary by more than 1% under all specied operating condi-

tions and over the expected life of the RPD.

The bandwidth of an RPD 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 RPD will need to

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

9.2 Antenna Design. The RPD antennas shall be designed

on printed circuit boards.

Printed circuit board antennas eliminate the need for RF con-

nectors and cabling that result in decreased reliability. Printed

circuit antennas are less prone to physical damage due to their

extremely low mass.

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

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

The enclosure shall be classied “f1” outdoor weatherabil-

ity in accordance with UL 746C.

The RPD shall be classied as watertight according to the

NEMA 250 standard.

The RPD enclosure shall conform to test criteria set forth

in the NEMA 250 standard for type 4X enclosures. Test

results shall be provided for each of the following type 4X

criteria:

● External icing (NEMA 250 clause 5.6)

● Hose-down (NEMA 250 clause 5.7)

● 4X corrosion protection (NEMA 250 clause 5.10)

● Gasket (NEMA 250 clause 5.14)

The RPD shall be able to withstand a drop of up to 5 ft.

(1.5 m) without compromising its functional and struc-

tural integrity.

The RPD enclosure shall include a connector that meets

the MIL-C-26482 specication. The MIL-C-26482 connec-

tor shall provide contacts for all data and power connec-

tions.

7.0 Electrical. The RPD shall consume less than 10 W.

The RPD shall operate with a DC input between 9 VDC and 28

VDC.

The RPD shall have onboard surge protection.

8.0 Communication Ports. The RPD shall have two communi-

cation ports, and both ports shall communicate independently

and simultaneously.

Two independent communication ports allow one port to be used for

conguration, verication and trac monitoring without interrupt-

ing communications on the dedicated data port.

The RPD shall support the upload of new rmware into the

RPD’s non-volatile memory over either communication port.

The RPD shall support the user conguration of the following:

● Response delay

● Push port

The communication ports shall support a 9600 bps baud rate.

9.0 Radar Design. The RPD shall be designed with a matrix of

radars.

The matrix of radars enables the sensor to provide detection over a

large area and to discriminate lanes.

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