Many researchers analyze the impact of radio interference on GNSS signal reception:
Albeit, some of our clients doubt that GNSS receivers can be susceptible to out-of-band radio interference.
This article demonstrates the practical results of GNSS receiver performance degradation due to the second harmonic of the DVB-T2 transmitter.
Our customer complains of poor quality GNSS reception near the TV tower. Our task is to make long-term GNSS signal measurements at different points and find the GNSS antenna’s best position.
DVB-T2 Transmitter Parameters
|Central Frequency||768 MHz|
|Power, RMS||5 kW|
|Second harmonic level||– 71 dB|
|Antenna height||190 m|
|Antenna gain||5 dB|
|Antenna radiation pattern||omnidirectional|
5 km Measuring Point
90 m Measuring Point
Hundreds of meters from the DVB-T2 transmitter @ 768 MHz, a significant degradation of the quality of the GNSS signal reception transpired. GNSS positioning accuracy decreases by a factor of five.
The number of visible satellites has a weak correlation with the interference level.