1
=
1
× cos
4
+ 2
1
2
1
=
The coecients needed to compute I are the reverse of the i coecients needed to
compute Q. That is, if you know
, then you also know
.
7.2.2 RVP900 Receiver Modes
Use the Mc menu to select the receiver configuration that defines IF processing for your site.
# Rx Mode Description
– –––––––––––––––––––––––
0 Standard single channel
1 ––Reserved––
2 Legacy RVP8/2005 WDN compatibility
3 Standard dual channel
Table 44 Receiver Mode Configuration Options
Mode Description
Mode-0: Standard Single
Channel
This is the most common mode used by single-polarization CW-pulsed radars
whose front-end LNA has a dynamic range less than ≤95 dB.
The (I,Q) data are computed from IF samples.
Mode-1: Reserved Reserved for future development.
Mode-2: Extra Wide Dynamic
Range
Radars with high performance front-end LNAs can preserve the full benefit of
that investment by running 2 separate IF signals to the Primary (HiGain) and
Secondary (LoGain) IFDR inputs.
A nominal channel separation of 25 dB ... 30 dB can be used to achieve an
overall dynamic range of up to 110 dB.
Mode-3: Dual-Rx From Two
IF Inputs
Standard dual polarization mode. The H and V channels are fed to 2 separate IF
inputs using the same intermediate frequency.
7.2.2.1 Wide Dynamic Range Mode-2
When RVP900 is used as an extended dynamic range receiver, you must make some
important decisions regarding setting up the RF/IF levels that drive the IFDR.
Separation Value
First, decide on the amount of signal level separation between the high gain and the low
gain IFDR inputs. There is an absolute minimum and absolute maximum channel separation
that still allows the IFDR to capture the full dynamic range of the receiver. If a signal level
separation is outside of these absolute limits. valuable receiver dynamic range is lost.
RVP900 User Guide M211322EN-J
174
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