R&S AREG800A, Руководство пользователя

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Configuring radar objects
R&S
®
AREG800A
54 User Manual 1179.3615.02 ─ 01
5 Configuring radar objects
In its basic configuration, the R&S AREG800A allows for simulation of radar objects.
This section introduces basic principles of radar object simulation, typical application
fields and step-by-step instructions illustrating typical radar object simulation scenarios.
About radar echo generation
The R&S AREG800A generates up to four radar echo signals by delaying the received
radar signal through up to four optical fixed delay lines. The delays are fixed and
defined during the purchasing process. The signal delay simulates echos from static
objects at different distance.
Additionally to delaying the signals, you can also apply an object attenuation and a
base attenuation. From the attenuation and the range, the R&S
AREG800A calculates
the radar cross section (RCS) if the object, where the RCS indicates the size of the
simulated radar object.
Use the object attenuation to vary the RCS values of the individual objects separately.
Change the base attenuation value to apply an attenuation (or gain) to all objects at
once.
Radar equation
The radar equation describes how much reflected RF power is received by a radar
sensor from a reflecting object. In this implementation, the radar equation (
Equa-
tion 5-1 ) is the basis for all attenuation and level calculations.
Equation 5-1: Radar equation
Radar equation elements:
●
P
RX
: Received power at the radar sensor
●
P
TX
: Transmitted radar signal power from the radar sensor
●
G
RX
: Gain of the radar receive antenna
●
G
TX
: Gain of the radar transmit antenna
● λ
= c/f is the wavelength of the radar signal and
– c = 299700000 m/s is the speed of light in the air
– f: frequency of the radar signal
●
RCS: Radar cross section
●
R: Distance between radar and a reflecting object
Radar cross section (RCS)
Radar cross section is a parameter which describes how much of the incoming radar
signal at the object gets reflected back to the radar sensor. The RCS does not repre-
sent the physical size of an object but is rather a virtual parameter. Multiply the RCS by
the power density of the radar signal at the location of the object to get the signal
power reflected back to the radar sensor.