Systems BPM-5 and «CONSOL» 1

Systems BPM-5 and «CONSOL» 1

System "console" and the BPM-5 (USSR). To receive the signal beacons BPM-5 and "console" on aircraft no additional hardware installation required. beacon signals can be received using a medium wave receiver or a radio compass. Using the beacon signal in flight can only be performed in the presence of special on-board card with pre-deposited lines bearing on the location beacons installed.

Practical range beacons action, working on medium wave (200-400 kHz) depends on the capacity of terrestrial radio

beacon receiver sensitivity and time. The power at the antenna operating in the beacon is from 1,5 5 to kilowatts, which allows the receiver to receive signals in the daytime average sensitivity at a distance of up to 1500 km. At night, beacons range of action increases due to the effect of radio waves reflected from the upper layers of the atmosphere, with the maximum signal range reaches 2500 km. In these cases, the direction finding accuracy is reduced.

Lighthouses radiate baseband signals in the form of a specific combination of dots and dashes. For reference the true bearing of the aircraft necessary for the DF cycle (1 minutes) to count the number of dots and dashes, listens in a particular sector, and the number of signals on the map to find the line

position of the aircraft. Diagram of beacons BPM-5 and "Console" system.

The beacons "console" the system is set the same or a reduced duty cycle during 40 seconds.

In the latter case the radiation is omnidirectional and no decrease somewhat pause. DF mode in all lighthouses set to 30 seconds. Lighthouses "console" the system are identified by two or three letters of the Latin alphabet. When working in a non-directional beacon light mode ( "long" dashes) can be measured by conventional CSD airborne radio compass.

Determination of bearing beacon is performed as follows.

  • 1. On special radionavigation charts, such beacons are scheduled, which are monitored during the flight only in sectors of reliable bearings.

  • 2. Configure the receiver, identify the beacon callsigns and the initial signals of the DF mode (dots or dashes emitted to the area of ​​the beam).

  • 3. For the number of places or the approximate radio direction of the IPS, determine the sector within which the aircraft is within a given period of time (the permissible error in determining the bearing is ± 1.

  • 4. It is checked that the initial signals of the direction finding mode (points or dashes, heard before the equal signal zone) correspond to the signals designating the identified sector on the map.

  • 5. During the direction-finding mode, the number of dots or dashes of the equisignal zone (that is, until the signals disappear) and after the equisignal zone are heard. The total number of dots and dashes in each duty cycle should be equal to 60.

  • 6. At the time of listening to the equal-signal zone, the direction-finding time is recorded.

  • 7. With the loss of a certain number of characters in the cycle, both the counted number of points and the counted number of dashes are added separately by the half-sum of the number of lost signals.

  • 8. The radio direction finding is laid on the map by the number of corrected signals (dots or dashes), heard before the equisignal zone, by linear interpolation between the multiple lines of direction finding shown on the map. For the given example, the bearing lines correspond to the 21 dash and should be drawn in the dash sector between the lines.

Bearing the airplane can be determined by measuring the stopwatch separate periods DF mode beacon.

Using this method, you can specify the plane bearing without listening to all the DF mode, as the number of lost signal is determined by the listening time of the beam.

The procedure for measuring the following:

  • 1) at the start of the direction finding mode, start the stopwatch;

  • 2) at the time the signals disappear, mark the time in seconds;

  • 3) stop the stopwatch when you start listening to other signals;

  • 4) to find, based on the time readings, and, according to them, the number of beacon signals to the equisignal zone.

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