6 results about "Effective radiated power" patented technology

The invention provides a waveform modulation method and system for an electromagnetic pulse combination effect. The method comprises the following steps: acquiring remote control communication frequency and flight state information of an unmanned aerial vehicle; electromagnetic pulse parameters and radiation power of electromagnetic pulses are set; generating an interference modulation waveform by using an interference waveform generation strategy based on the electromagnetic pulse parameters; the carrier frequency of the interference modulation waveform is the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform has repetition pulses with repetition frequency random jitter and / or positive and negative polarity random alternation; based on the interference modulation waveform, electromagnetic pulses are transmitted to the unmanned aerial vehicle at the required effective radiation power to achieve the front and rear door combination effect. The interference modulation waveform generated by the invention has the characteristics that the frequency is the same as or adjacent to the remote control communication frequency, the repetition frequency is randomly jittered and / or the positive and negative polarities are randomly alternated, the front and back gate combination effect can be generated under relatively low transmitting power, and the operational efficiency is improved.

The application discloses a high-power microwave antenna establishing method, and belongs to the technical field of antennas. The method comprises the following steps: determining the total radiation aperture of the antenna according to the size and gain requirement of the microwave antenna of a system, and estimating the aperture and quantity of the required transmitting antenna by considering the beam synthesis efficiency; and selecting a proper rotating table according to the aperture and quantity of the transmitting antenna. Since the antennas are installed on the same rotating table, the consistency between the antennas can be ensured through a tooling, so that all the antennas can be simultaneously aimed at a target or a certain direction by rotating the rotating table, the signal transmitting distances of the antennas to the target are the same, and the effective radiation power in a certain direction can be maximized by only ensuring that the amplitude, phase and time delay of the front-end link of the transmitting antenna are the same. Since the antennas are on the same rotating table, the driving systems of the antennas are the same, and the influence of the time delay between different driving systems is eliminated.

The invention provides an unmanned aerial vehicle microwave pod based on a high-power microwave pulse compression technology aiming at the countering requirement of an unmanned aerial vehicle and a fleet and the problems that a traditional hard killing weapon is low in response speed, high in cost-effectiveness ratio and the like. Comprising a horizontal polarization X-band horn antenna, an X-band pulse compression assembly, an unmanned aerial vehicle passive detection system forming killing effective radiation power not less than 1GW, a rotary table, a high-voltage power supply assembly, a lithium ion battery pack, a high-voltage / low-voltage connection cable assembly, a communication radio station / data transmission terminal and a transmitting antenna servo and structural member. The system has the advantages that the system can defend the unmanned aerial vehicle, and potential threats are reduced. The cost is low, and effective operation can still be ensured in severe weather.

This invention provides a waveform modulation method and system for electromagnetic pulse combination effects. The method involves acquiring the remote control communication frequency and flight status information of a UAV; setting electromagnetic pulse parameters and radiated power; generating an interference modulation waveform based on the electromagnetic pulse parameters using an interference waveform generation strategy; the carrier frequency of the interference modulation waveform being the same as or adjacent to the remote control communication frequency, and the pulse sequence of the interference modulation waveform having repetitive pulses including random jitter of repetition frequency and / or random alternation of positive and negative polarities; and transmitting electromagnetic pulses to the UAV with the required effective radiated power based on the interference modulation waveform to achieve a front-and-back door combination effect. The interference modulation waveform generated by this invention has the characteristics of being the same as or adjacent to the remote control communication frequency, and having repetitive pulses with random jitter of repetition frequency and / or random alternation of positive and negative polarities, which can generate a front-and-back door combination effect with relatively low transmission power, improving operational effectiveness.

The application provides a multi-octave phased array design method based on a heterogeneous antenna combination, which comprises the following steps: step 1, constructing a high-frequency array; step 2, constructing a medium-frequency array; step 3, constructing a low-frequency array; step 4, constructing a multi-stage subarray synthesis switch network, or configuring an AD / DA module after each array element channel in a full-channel digital array manner, so that the sampled data after discretization is digitally beam synthesized according to the equivalent array element relationship; and step 5, configuring corresponding working frequency band components according to the antenna type, and configuring AD / DA modules according to the subarray output of each frequency band. The method improves the gain utilization rate of the system in the multi-octave working frequency band, reduces the number of hardware channels without reducing the effective radiation power and sensitivity, compresses the equipment cost, meets the balance between the array gain and the number of channels of the system, and changes the characteristic that the efficiency of a single antenna at low frequency is always lower than that at high frequency.

The application relates to the technical field of array antennas, in particular to a 5G high-gain array antenna, one end of each fixed plate is fixedly connected with a protective cover, each protective cover is fixedly connected with an antenna body, the inner wall of each protective cover is fixedly connected with a linear motor, the output end of each linear motor is fixedly connected with a telescopic wave-absorbing peg array piece through a connecting shaft, each telescopic wave-absorbing peg array piece is located on the outer side of the corresponding antenna body, and a plurality of heat dissipation scales are connected on each protective cover along the axial line direction at equal intervals. After the linear motor is started, the telescopic wave-absorbing peg array piece is driven to move through the connecting shaft, the equivalent dielectric constant in the protective cover is changed after the telescopic wave-absorbing peg array piece moves, the resonance condition is destroyed, the standing wave distribution is disturbed, the resonance cavity effect cannot be formed in the protective cover, the effective radiation power cannot be reduced, the covering radius cannot be reduced, and the signal transmission quality is improved.