WIRELESS SECURITY SOLUTION

The Technology

WIRELESS SECURITY SOLUTION

The Technology

NULL steering technology

GPS DOME is a cyber device based on known technology of protection against electromagnetic warfare called Null Steering.

This technology summarizes the reception of two antennas with a phase difference calculated to direct the NULL of the combined two antennas pattern toward the jammer, thus decreasing its power effect by about 30 dB.

Null steering reception/transmission is a preprogrammed spatial signal processing method, by which a transmition/reception antenna array can direct zero (NULL) against jamming of wireless communications.
Using this technology allows taking into account the effect of environmental noise and/or unknown transmitters, so these will be amplified (or reduced) in the integrated reception input.

Null steering is a method of beam forming for narrow-band signals, when required to compensate for phase difference generated among several reception inputs from the same source in the receiving antenna (due to a number of different reception directions) in the various elements of the receiving antenna array.

Basically, in order to improve the antenna array’s performance, the signals received in the antenna array’s elements are summed up and avergared.

This is only possible if there is no phase difference among the signals at each receiving antenna. In case there are phase differences, they should be corrected first and only then the antennas can  be summed up. Amendment to bring a phase difference of 180 degrees, will bring the sum of the signals to be 0.
To make such a summary one should summarize a weighted version of the received signal with appropriate weighting coefficients.

To do so the frequency level should accept the result of the sum signal 0.
Weighting coefficients depend of course on the abeyance and the signal frequency required.

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NULL steering technology

GPS DOME is a cyber device based on known technology of protection against electromagnetic warfare called Null Steering.

This technology summarizes the reception of two antennas with a phase difference calculated to direct the NULL of the combined two antennas pattern toward the jammer, thus decreasing its power effect by about 30 dB.

Null steering reception/transmission is a preprogrammed spatial signal processing method, by which a transmition/reception antenna array can direct zero (NULL) against jamming of wireless communications.
Using this technology allows taking into account the effect of environmental noise and/or unknown transmitters, so these will be amplified (or reduced) in the integrated reception input.

Null steering is a method of beam forming for narrow-band signals, when required to compensate for phase difference generated among several reception inputs from the same source in the receiving antenna (due to a number of different reception directions) in the various elements of the receiving antenna array.

Basically, in order to improve the antenna array’s performance, the signals received in the antenna array’s elements are summed up and avergared.

This is only possible if there is no phase difference among the signals at each receiving antenna. In case there are phase differences, they should be corrected first and only then the antennas can  be summed up. Amendment to bring a phase difference of 180 degrees, will bring the sum of the signals to be 0.
To make such a summary one should summarize a weighted version of the received signal with appropriate weighting coefficients.

To do so the frequency level should accept the result of the sum signal 0.
Weighting coefficients depend of course on the abeyance and the signal frequency required.

BACKGROUND

Some GPS units on the market which have both internal and an optional external antenna, had been found to have compatibility issues with GPS DOME devices. When testing them with GPS DOME, they seem as if not protected at all from interferences and show no improved anti-jamming capabilities over a non-protected unit. Examples of units found to have this issue: Sherlog Trace 816, TomTom Link 530

DETAILS

The reason behind the phenomena described above, is that the indication for the receiving unit (the GPS telematics unit) to determine the existence of an external antenna is that when an external antenna is connected, it withdraws current from the receiver unit. In effect, when the GPS DOME is connected to the external antenna input port on the telematics unit, the unit does not “realise” that an external antenna has been connected and uses its internal GPS antenna only. Since the internal antenna is not protected, its performance is then similar or even worse than an unprotected unit.

SOLUTION

The solution to this issue is by changing AD7200, so that when in DF mode, it will withdraw DC current as if it is an external antenna. This option will be added using temporary patch to the AD7200 V2, Starting at the production batch after Nov. 2018, and will be replaced by a AD7200 V3, when we finish the already produced V2 PCB.

NOTICE

Please be aware that current production DF units (until units products after Nov 2018) cannot be used with equipment that has optional external antenna, with auto detection of external antenna. If the units could be “forced” to work with external antenna only they should work properly.

request a demo

TECHNICALNOTE

October 22 - 2018

BACKGROUND

Some GPS units on the market which have both internal and an optional external antenna, had been found to have compatibility issues with GPS DOME devices. When testing them with GPS DOME, they seem as if not protected at all from interferences and show no improved anti-jamming capabilities over a non-protected unit. Examples of units found to have this issue: Sherlog Trace 816, TomTom Link 530

DETAILS

The reason behind the phenomena described above, is that the indication for the receiving unit (the GPS telematics unit) to determine the existence of an external antenna is that when an external antenna is connected, it withdraws current from the receiver unit. In effect, when the GPS DOME is connected to the external antenna input port on the telematics unit, the unit does not “realise” that an external antenna has been connected and uses its internal GPS antenna only. Since the internal antenna is not protected, its performance is then similar or even worse than an unprotected unit.

SOLUTION

The solution to this issue is by changing AD7200, so that when in DF mode, it will withdraw DC current as if it is an external antenna. This option will be added using temporary patch to the AD7200 V2, Starting at the production batch after Nov. 2018, and will be replaced by a AD7200 V3, when we finish the already produced V2 PCB.

NOTICE

Please be aware that current production DF units (until units products after Nov 2018) cannot be used with equipment that has optional external antenna, with auto detection of external antenna. If the units could be “forced” to work with external antenna only they should work properly.

request a demo
GPS DOME 1.02

Features

  • CRPA null steering technology
  • Small form factor: 70 x 48 x 24mm, 150g
  • Minimal power consumption: < 0.75W
  • IP67, -40℃ to +85℃
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