![]() ![]() Specifies the airport ICAO and runway name. To adjust this until the localizer is nicely displayed on the runway in the 3D map. The correct elevation value may differ from the terrain height in the 3D map, depending on which terrain model is used (as set in the 3D map settings), so you may wish Specifies the runway threshold elevation in feet. Specifies the longitude of the runway threshold, in decimal degrees (East positive). Specifies the latitude of the runway threshold, in decimal degrees (North positive). This is demodulated and displayed below the CDI. The ILS identifier is broadcast as Morse code at an offset of 1020Hz from the ILS carrier. Selecting one of these will automatically fill in the other fields with details of the ILS. The drop-down contains a number of identifiers for ILSs atĪirports within the South East of the UK. In this case, theīandwidth should be set wide enough to cover all signals (E.g. ![]() In some countries, offset carrier can be used, where the same signal is transmitted at multiple offsets. This should be set wide enough to contain the ILS and audio signal. ![]() This specifies the bandwidth of a filter that is applied to the input signal to limit the RF bandwidth. Glide slopes using a paired frequency in the range 329-335MHz range, which is typically not displayed on charts. Localizers use the same frequency as listed on aviation charts for the ILS. When a frequency is selected, the device will be tuned to the corresponding frequency. The localizer provides horizontal guidance and the glide slope vertical. Specifies whether the ILS Localizer (LOC) or Glide Slope (G/S) signal is to be demodulated. tip vertical bar (bright green): peak hold value.bottom bar (blue green): instantaneous peak value.2: Channel powerĪverage total power in dB relative to a +/- 1.0 amplitude signal received in the pass band. Pressing shift simultaneously moves digit by 5 and pressing control moves it by 2. Wheels are moved with the mousewheel while pointing at the wheel or by selecting the wheel with the left mouse click and using the keyboard arrows. This effectively floors value at the digit position. Right click on a digit sets all digits on the right to zero. Left click on a digit sets the cursor position at this digit. Use the wheels to adjust the frequency shift in Hz from the center frequency of reception. The top and bottom bars of the channel window are described hereġ: Frequency shift from center frequency of reception If you are able to capture a G/S signal as a IQ. Note: The G/S could do with additional testing. If you only have one SDR, you can demodulate either signal independently. Will be stronger above the glide path, with the 150Hz being stronger below.Īs the LOC and G/S signals are so far apart in frequency, in order to receive both simultaneously, two SDRs, each with their own ILS Demodulator, are required. When approaching the localizer, the 90Hz tone will be stronger to the left and the 150Hz tone will be stronger to the right. The tones will be equal (more specifically, the difference in depth of modulation (DDM) will be 0), along the localizer course line or glide path. A phased antenna array is used so that the relative strength of the tones to the carrier varies throughout space. Two independent signals are transmitted as part of ILS on different frequencies: The localizer (LOC) signal (at 108-112MHz) that gives guidance in the horizontal planeĪnd the glide slope (G/S) signal (at 329-335MHz) that gives guidance in the vertical plane.Įach signal contains 90Hz and 150Hz tones. The ILS localizer course and glide path can be displayed in 3D on the Map feature. Such as the DDM (Difference in Depth of Modulation), as well as a visual representation of course line & glide path deviation on aĬDI (Course Deviation Indicator), similar to that used in aircraft. Details of the demodulated signal are displayed, Used by aircraft to perform precision approaches and auto-lands. This plugin can be used to demodulate ILS (Instrument Landing System) signals. ![]()
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