The main contributions of this paper are summarized as follows: 1) A novel jamming detection technique (section 4.1): This technique consists of two steps.
Section 4 presents the proposed technique in two aspects: Cluster updation and Jamming Detection.
The jamming layout is shown as Figure 1, v is the SAR platform speed.
Then the distance of point P jamming signal from the SAR transmitter to the l th channel antenna receiver is:
"The jamming system comprises two major parts, the receiving function and the transmit function, and we radiate these signals in a computer model to see if the jamming pod is doing what we expect," says Boyne.
The digital signals are simulated to change in direction and power, giving Qinetiq an understanding of how well the jamming pod is working, and any faults.
Then, the frequency alignment benefit function [q.sub.2ij] is addressed to report the jamming suppression effect of attacker [u.sub.i](i =1,2,..., m) on defender [R.sub.j](j = 1,2, ..., n) .The attacker [u.sub.i] can only jam the defender [R.sub.j] if the attacker's jamming frequency overlaps with the defender's operating frequency.
If the distance between the attacker and the target exceeds the jamming radius, the jamming is invalid.
Theoretical analysis and numerical simulation prove that the direction of the pattern is not offset by the suppression of main-lobe jamming. The output SINR of satellite navigation signal will not decrease due to the directional offset of the pattern, and the output SINR is only related to the intensity of the input jamming signal, which will be helpful for the navigation receiver to process the navigation signal.
There is a far-field desired signal and P narrowband jamming signals incident as plane wave (wavelength [lambda]) .
Jamming in wideband frequency--wideband jamming emits energy within a wideband frequency thus jamming the operation of all the devices occurring within that frequency range and jammer range.
Sweep jamming within a frequency range is a compromise between wideband and narrow-band jamming.
This technique involves just increasing the jamming
power by enough to overcome the processing gain in the receiver.
military believes that as many as 2,400 GPS jamming
units were transferred to Iraq from Russia.
These chapters present mathematical models of radar and jamming
signals as well as models of systems as targets and jamming