Method and sensor for detecting the presence of co-channel jamming
View Patent ↗A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal, the method including verifying that the multiplexed radio signal has a symmetric passband; detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in the multiplexed radio signal during a predetermined measurement duration; calculating a rate of positive or negative noise peaks among the plurality of peaks; and determining a score characteristic of a probability that co-channel interference exists in the multiplexed radio signal on the basis of the rate of positive or negative noise peaks.
1. A method for detecting co-channel interference in a frequency-modulated multiplexed radio signal, said method comprising:
verifying that said multiplexed radio signal has a symmetric passband;
detecting and counting a plurality of positive noise peaks and a plurality of negative noise peaks in said multiplexed radio signal during a predetermined measurement duration;
calculating a rate of positive or negative noise peaks among said plurality of peaks; and
determining a score characteristic of a probability that co-channel interference exists in said multiplexed radio signal on the basis of said rate of positive or negative noise peaks.
2. The method as claimed in claim 1 , wherein a positive or negative noise peak is taken into account only if said multiplexed radio signal has a symmetric passband.
3. The method as claimed in claim 2 , comprising a prior step of comparing the signal-to-noise ratio of the multiplexed radio signal with a predetermined threshold, a positive or negative noise peak being taken into account only if said signal-to-noise ratio in said multiplexed radio signal is greater than said predetermined threshold, said predetermined threshold preferably being equal to 20 dB.
4. The method as claimed in claim 1 , comprising a prior step of comparing the signal-to-noise ratio of the multiplexed radio signal with a predetermined threshold, a positive or negative noise peak being taken into account only if said signal-to-noise ratio in said multiplexed radio signal is greater than said predetermined threshold, said predetermined threshold preferably being equal to 20 dB.
5. The method as claimed in claim 1 , wherein said predetermined measurement time is equal to 128 ms, plus or minus 10 ms.
6. The method as claimed in claim 1 , wherein said score is determined as being equal to:
1
-
K
⨯
abs
(
N
mean
+
-
N
mean
-
)
N
mean
v
where N mean + is the rate of positive noise peaks averaged over the predetermined measurement duration, N mean − is the rate of negative noise peaks averaged over the predetermined measurement duration, N mean v is the total number of noise peaks taken into account, and K is a scale factor to be determined.
7. The method as claimed in claim 1 , wherein the score characteristic of a probability that co-channel interference exists is determined only if the number of positive or negative noise peaks taken into account is greater than a predetermined threshold, preferably equal to 48.
8. A co-channel interference detection system, comprising a computer having computing means and a memory space, and means for detecting positive and negative noise peaks in a multiplexed radio signal, said computing means, the memory space, and said means for detecting positive and negative noise peaks being designed to implement the method as claimed in claim 1 .
9. A radio receiver comprising a co-channel interference detection system as claimed in claim 8 .
10. A motor vehicle comprising a radio receiver as claimed claim 9 .