DARE!! Products B.V. – Product Manual Page | 8
Explanation and examples regarding Gated Pulse Modulation
Several automotive manufactures use EMC standards that define specific Radar Pulse tests. These
tests consist of a #number of pulses with a specific pulse duration and pulse repetition rate.
Explanation of Automotive Radar Pulse testing
Ford RI-114 Radar Pulse test (FMC1278) and PSA B21 7110 are using:
•
Pulse Repetition Rate (PRR) =
300 Hz
•
Pulse duration (PD)
=
3 µs
•
No. of pulses per second (N) =
50
GM GMW3097-2019 uses:
•
Pulse Repetition Rate (PRR)
=
300 Hz
•
Pulse duration (PD)
=
6 µs
•
No. of pulses per second (N) =
50
The RadiGen
®
plug-in card can generate the
requested RF bursts per these automotive
standards, using Gated Pulse modulation.
Normal pulse modulation must be used to set
the Pulse ON/OFF times, using respectively the
PULSe:WIDTh and PULSe:DELay command of
the RadiCentre
®
system user interface.
Limitations
The Pulse ON and OFF times apply to the specific limitations to the number of pulses per period
for the Gated Pulse modulation. The RadiCentre
®
system user interface makes use of equations to
intelligently adapt the buttons, prohibiting invalid settings. When the RadiGen
®
plug-in card is
controlled externally by PC-software, this limitation must be controlled by the PC-software. The
limitations are given by the following formulas.
1
1
−
=
+
−
Delay
Width
Pulse
Pulse
ms
Gateperiod
MAX
N
The maximum number of pulses in one burst is limited by the settings of the pulse modulation.
For example; using the Ford standard with a repetition rate of 300 Hz, a pulse width of 3µs and
period time of 1 second, results in a maximum of 298 pulses.
The formula can also be rewritten to calculate the pulse parameters:
N
Pulse
N
ms
Gateperiod
MAX
Width
Delay
Pulse
)
(
)
1
(
)
(
⋅
−
−
=
N
Pulse
N
ms
Gateperiod
MAX
Delay
Width
Pulse
)
(
)
1
(
)
(
⋅
−
−
=
