Interference in reading guidance-In contemporary electronic warfare, the contest between electronic interference and anti-interference is getting more and more fierce. The development of radar active jamming identification algorithm has important strategic significance and has become a research hotspot in the field of radar countermeasures.
Buried nose: radar active jamming? Deception interference, suppression interference, self-defense interference and team support interference.
Q: Jamming can be suppressed by pulse compression radar. If the convolution form of jamming suppression is integrated into the radar echo signal, can it be suppressed only by the working principle of radar itself, or by other means such as waveform design and frequency hopping.
Embedded cow Text: Introduction to Suppression and Self-defense Interference
barrage jamming
Frequency aiming jamming
swept jamming
1. Suitable for traditional jamming, frequency aiming and frequency sweeping. The point frequency interference of various jammers at the expense of hardware facilities also appears behind;
2. The traditional radio frequency noise jamming is to directly amplify Gaussian self-noise with a high-frequency amplifier and output it as jamming signal, so the noise generated is incoherent noise suppression jamming, which is very poor for coherent radar.
Intelligent noise interference:
Advantages:
Compared with traditional jamming, smart noise jamming has a significant improvement in power utilization, and it needs to know enemy radar information better than traditional jamming. The whole working process of convolution jamming is to convolve the radar emission signal obtained by jammer with the noise jamming signal, and amplify the power to output the corresponding jamming signal. Smart noise jamming based on convolution modulation can produce controllable high-density multi-false target jamming. This kind of jamming has the characteristics of traditional suppressed jamming, and can overlap the echo of the covered target in time domain and frequency domain, thus greatly improving the jamming efficiency of the new radar system. In addition, because smart noise based on convolution modulation superimposes multiple random false targets on the background of noise interference, the randomness of interference waveform is enhanced.
(1) self-defense interference
? Self-defense jamming generally refers to hanging jamming equipment on a combat aircraft to interfere with the enemy's electronic warfare system by electronic jamming to ensure its own safety. Usually, self-defense jamming is generally used when effective support from its own electronic jamming force cannot be obtained.
? Self-defense jamming comes from the jamming equipment carried on the fighter, which mainly interferes with the guidance radar that poses the most serious threat to the aircraft. Its working frequency band is generally L or X band. Self-defense jamming is generally passive jamming, that is, the jamming pattern implemented after being captured and tracked by enemy radar. Due to the limitation of its own size and power, the jamming signal has limited energy and short range, and the jamming mainly enters from the radar main lobe, which will cause strong interference to the guidance radar and seriously affect the normal tracking and guidance of the guidance radar.
(2) Team Support Interference
In-team jamming means that the aircraft carrying out electronic jamming enters the combat area with the combat aircraft in an appropriate formation, and uses the electronic countermeasures equipment loaded on the aircraft to carry out electronic jamming on the combat area, mainly jamming the enemy's target indication radar, guidance radar, airborne fire control radar, etc. , thus improving the battlefield survival rate of our own fighters, with a variety of jamming styles, playing an important role in electronic countermeasures.
? Generally, formation support jamming can be divided into mixed formation and independent formation. Here are two formation styles. Independent formation. More emphasis is placed on supporting the independence of the jammer, which flies to the established target independently. Provide necessary cover for your own combat aircraft and complete combat missions such as raids. In general, the electronic jamming aircraft is located in front of or behind the covered aircraft. This formation support jamming mode is convenient for electronic jammers to change to long-distance support jamming in the process of aircraft formation, so that jammers do not enter the enemy fire threat area, thus effectively ensuring their own safety. The formation method is shown in the following figure.
The mixed formation needs to be equipped with 1 to 2 electronic jammers on each attack formation. The jammer is in front of the covered aircraft, and the formation mode is "pin". Jammer shields its own attack aircraft in the rear by releasing jamming signals until the whole formation leaves the fire threat area completely, as shown in the following figure.