Radar Receiver

You can model the following components of a radar receiver:

Specs

Antenna to LNA Line Loss. The loss of the transmission line between the antenna and the Low Noise Amplifier.

LNA Gain. The gain introduced by the LNA.

LNA to Receiver Line Loss. The loss of the transmission line between the LNA and the Receiver.

Rain Model. To use a rain model in your scenario, you must select a global Rain Model on the Scenario's RF Environment properties page. Use Outage Percent to set the maximum percent outage for the rain model. To disable the Rain Model used in the calculation for this receiver, clear Use. For rain model descriptions, see Rain Model.

If the Rain Model is not selected at the scenario level, the rain model parameters are grayed out.

RF Filter

You can enable power spectral density (PSD) analysis and RF spectrum filters on the radar object.

Radar objects use signal power spectral density analysis to compute the reflected signal power as seen by the radar receivers front-end bandwidth.

The fidelity of the radar system analysis is enhanced by taking into account the signal spectrum and the distribution of power across the frequency band.

The receive side filter updates the spectrum shape of the incoming radar return signal. The filters can be used to enhance the spectral components or to suppress the unwanted jamming signal.

Starting with STK 10.1, the RF filter on the radar receive side is placed in front of the Low Noise Amplifier (LNA). This will impact all incoming signals across the bandwidth of the receive RF filter.

LNA Bandwidth. User-specified default value for the radar-receiver Low Noise Amplifier (LNA) bandwidth. This value is used to compute the received signal power across the radar receiver bandwidth. A uniform characteristic response model is used across the LNA bandwidth.

The use of a receive-side RF filter determines the radar receiver bandwidth. The receiver RF filter characteristics are used to compute the received signal power. In this case, the receiver RF filter bandwidth will (internally) override the LNA bandwidth value.

Note that when RF filters are used, their respective bandwidths are used to determine the transmitter signal and receiver bandwidths. The LNA bandwidth GUI value specified is retained for later use. .

Filter Model. To specify a filter model, select Use and browse to a filter model. For more information, see Filter Models.

Polarization

To specify a polarization model, select Use and select a polarization type. For descriptions of the polarization parameters, see Polarization.

System Noise Temperature

You can set noise temperature by selecting Constant and entering a value directly. Alternatively, you can have STK calculate the system temperature for you. To do so, select Compute and specify the parameters that STK will use in calculating noise temperature. For parameter descriptions, see System Noise Temperature.

Sensitivity Time Control Attenuation (STC)

To specify STC attenuation parameters, select Enable Rf STC and select an STC attenuation type. For descriptions of the STC attenuation parameters, see Sensitivity Time Control Attenuation (STC).

Additional Gains and Losses

Pre-Receive Gains/Losses. To define a Gain or Loss, click Add. Enter a brief description of the Gain or Loss in the Identifier field and its value in the Gain field. Remember to make it negative if a Loss is being entered. Once the values are entered, you can click Remove to delete an entry from the table. To modify an existing entry, simply edit the fields in the grid. The value in the Pre-Receive field will reflect the net value of all gains and losses recorded in the table.

For more information on modeling gains and losses that affect performance but are not defined using built-in analytical models, see Pre-Receive & Pre-Demod Gains & Losses.

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