Instrument Function > Modulation > DME Modulation > DME Analysis > DME Analysis Settings
DME Analysis Settings

Access:

 

Select "Modulation > config... > DME > DME Analysis".

The "DME Analyisis" dialog provides the settings to configure the parameters of the reply signal of the ground station transponder. You can use this feature when an R&S NRP-Z81 power sensor is connected to the R&S SMA sensor connector.

DME Analysis State - DME Modulation

Activates the DME analysis. The R&S SMA generates interrogation pulse pairs and starts an internal counter for time measurement.

The measurement gate settings determine the measurement window (expected reply delay +/- gate length/2). The analysis evaluates the measured time delay and the response efficiency of the reply pulses. It includes only pulse pairs, which have the 50% voltage point of the rising edge of the first pulse within this range. The delay measurement is averaged within the measurement cycle. The reply efficiency is calculated once for each measurement cycle.

Example: 

The gate length is 1 µs and the expected reply delay is 50 µs. The measurement window (measuring range) is between 49.5 µs to 50.5 µs.

Remote command: 
 
Expected Reply Delay - DME Modulation

Sets the expected reply delay.

The measurement gate settings determine the measurement window (expected reply delay +/- gate length/2). The analysis evaluates the measured time delay and the response efficiency of the reply pulses. It includes only pulse pairs, which have the 50% voltage point of the rising edge of the first pulse within this range. The delay measurement is averaged within the measurement cycle. The reply efficiency is calculated once for each measurement cycle.

Example: 

The gate length is 1 µs and the expected reply delay is 50 µs. The measurement window (measuring range) is between 49.5 µs to 50.5 µs.

Remote command: 
 
Gate Length - DME Modulation

Sets the gate length for the measurement window.

The measurement gate settings determine the measurement window (expected reply delay +/- gate length/2). The analysis evaluates the measured time delay and the response efficiency of the reply pulses. It includes only pulse pairs, which have the 50% voltage point of the rising edge of the first pulse within this range. The delay measurement is averaged within the measurement cycle. The reply efficiency is calculated once for each measurement cycle.

Example: 

The gate length is 1 µs and the expected reply delay is 50 µs. The measurement window (measuring range) is between 49.5 µs to 50.5 µs.

Remote command: 
 
Measurement Count - DME Modulation

Sets the number of pulse pairs which are sent from the R&S SMA (= interrogator) to the ground station in one measurement cycle.

The measurement gate settings determine the measurement window (expected reply delay +/- gate length/2). The analysis evaluates the measured time delay and the response efficiency of the reply pulses. It includes only pulse pairs, which have the 50% voltage point of the rising edge of the first pulse within this range. The delay measurement is averaged within the measurement cycle. The reply efficiency is calculated once for each measurement cycle.

Example: 

The gate length is 1 µs and the expected reply delay is 50 µs. The measurement window (measuring range) is between 49.5 µs to 50.5 µs.

Remote command: 
 
Peak Level State - DME Modulation

Activates the measurement of the average peak level of all valid pulse pairs in a measurement cycle.

Remote command: 
 
Peak Level - DME Modulation

Indicates the measured average peak level of all pulse pairs in a measurement cycle.

Remote command: 
 
Reply Delay Status- DME Modulation

Activates the measurement of the average reply delay of all valid pulse pairs in a measurement cycle.

Remote command: 
 
Reply Delay - DME Modulation

Indicates the measured average reply delay of all valid pulse pairs in a measurement cycle. If there are no valid measurements available in the set measurement window "invalid" is indicated.

Remote command: 
 
Reply Efficiency State- DME Modulation

Activates the measurement of the reply efficiency in %. The measurement is the ratio of the number of measured valid reply pulse pairs to transmitted pulse pairs in a measurement cycle.

Remote command: 
 
Reply Efficiency - DME Modulation

Indicates the measured reply efficiency in %. The measurement is the ratio of the number of measured valid reply pulse pairs to the transmitted pulse pairs in a measurement cycle. If there are no valid measurements available in the set measurement window "invalid" is indicated.

Remote command: 
 
Pulse Repetition Frequency State - DME Modulation

Activates the measurement of the mean pulse repetition rate of the DME ground station. For this measurement, all received pulses of the DME ground station are considered. The typical measurement time for this parameter is approx. 1 s.

This measurement and the measurement of the delay, reply efficiency and average peak power are performed alternately. Therefore, the speed of the pulse repetition measurement increases when all other measurements are deactivated.

Remote command: 
 
Pulse Repetition Frequency - DME Modulation

Indicates the measured mean pulse repetition rate of the DME ground station.

For this measurement, all received pulses of the DME ground station are considered. The typical measurement time for this parameter is approx. 1 s.

This measurement and the measurement of the delay, reply efficiency and average peak power are performed alternately. Therefore, the speed of the pulse repetition measurement increases when all other measurements are deactivated.

If there are no valid measurements available in the set measurement window "invalid" is indicated.

Remote command: 
 
Normalize Setup - DME Modulation

Performs a normalization of the test setup. The delay due to the test setup is measured and subsequently considered in the reply measurements.

Remote command: 
 

 


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