GP-Blocker

An RF switch with 110 dB of RF isolation level and embedded L-band GNSS jammer

Designed to protect a GNSS time server against high-power/military-grade GNSS spoofing

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Key Features

Key Features

All time servers are equipped with a high-stable local oscillator to provide an accurate clock if PTP or GNSS signals are unavailable. Therefore, the simplest and most reliable way to protect a time server against GNSS spoofing is to disable the GNSS antenna port and switch a time server to Hold Over mode.

The GP-Blocker is an RF switch with a remarkable 110 dB of RF isolation level and an embedded L-band GNSS jammer. The GP-Blocker is installed amid the time server and the GNSS antenna. In case GNSS spoofing is detected, GP-Blocker disconnects the GNSS antenna from the time server antenna port, the time server loses satellite signals and switches to “Hold Over” mode. This maintains high accuracy of the PPS signal under GNSS spoofing.

The maximum output power of a standard GNSS antenna can reach up to 5 dBm. This may ensue in the case of military-grade spoofing or even when a low power SDR is near the GNSS antenna. The typical receiver sensitivity level is about minus 145 dBm in a tracking mode. Hence, to block spoofing, an RF switch with an isolation level of at least 150 dB is necessary. However, commercially available switches do not provide more than 90 dB. And even if two switches are used, the required blocking level will not be accomplished due to RF cables leakage.

The GP-Blocker with a high level of RF isolation combined with the built-in GNSS jammer can block the most powerful military-grade GNSS spoofing.

  • Intended to operate both in combination with GP-Probe TGE2 and stand-alone
  • RS485 interface with open API for remote control
  • Two-stage RF switch with total RF isolation level of 110 dB
  • Small enclosure: 35mm @ 45mm
  • DC switch to shut the GNSS antenna’s embedded preamplifier and simulate a GNSS antenna failure
  • L-band GPS, Galileo, BeiDou, GLONASS jammer with power regulation
  • Backup power from the GNSS receiver, in the absence of main power supply
  • Supplied with GP-Divider – 2-way GNSS splitter
Specifications

Specification

RF parameters

Frequency Range:1.15 GHz – 1.65 GHz
VSWR:1.30:1
P1dB:28 dBm
Isolation:110 dB min
Insertion Loss:2.5 dB typical
3.0 dB max

Power Supply

Power Supply:5 VDC nominal
15KV ESD protection
Backup Power Consumption:
  • 2.2 mA @ 3.3 VDC antenna bias
  • 2.5 mA @ 5 VDC antenna bias
Power Consumption:
  • GP-Blocker is not active
    17 mA
  • GP-Blocker is active, the jammer is disabled
    21 mA
  • GP-Blocker is active, the jammer is enabled
    100 mA @ low power output
    115 mA @ high power output

Interface

RS-485

15KV ESD protection

GNSS Jammer

GNSS Jammer Bands:1575.42 GHz
1561.098 GHz
1598.0625 – 1609.3125 GHz
GNSS Jammer Max Power:5 dBm
-75 dBm/Hz
GNSS Jammer Min Power:-25 dBm
-105 dBm/Hz
Modulation:noise-modulated

Mechanical

Housing:Aluminum, IP20
Size:64.5 x 32.0 x 8.5 mm
Weight:50 g

Environmental

Operational Temperature:-40°C to +85°C
Storage Temperature:-50°C ~ +85°C
Humidity:0% – 95% RH non-condensing @ 40°C
Vibration and Shock:15g/0.53oz, 11ms half-sine wave
Vibration:10 – 55 Hz/0.07g, 55 – 500 Hz/1.0g

GNSS Antenna Input/Output

Connector Input:SMA(F)
Connector Output:SMA(M)
Impedance:50 Ω
Antenna Bias Voltage:3.3 – 5 VDC
ESD Protection:15 KV

Regulatory Compliance

EMC:EN 55022
EN 55024
Safety:EN 60950-1: 2006+A2: 2013
RoHS:ROHS3 Compliant

Warranty & Support

Warranty:1 year
Extended warranty is available
Support:1 year of complimentary technical support

Package Content

GP-Blocker:1 pc. RF switch with an embedded L-band GNSS jammer
GP-Divider:1 pc. 2-way GNSS splitter to share one GNSS antenna between two receivers
HOST Cable:1 pc. 1.83 m length
USB-RS485 AdapterRS-485 Adapter to connect GP-Blocker to HOST computer
Manuals:Quick start guide

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