CN113917496A - Anti-interference test method and device for navigation - Google Patents
Anti-interference test method and device for navigation Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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Abstract
The invention discloses a navigation anti-interference test method and a navigation anti-interference test device, wherein the method comprises the following steps: acquiring a first position of a navigation receiver to be interfered and second positions of a plurality of aerial platforms; wherein, a plurality of aerial platforms are all provided with ultra-wideband electromagnetic pulse sources; calculating a plurality of first transmission moments according to the first position and the second position; controlling a plurality of aerial platforms to send a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to a plurality of first sending moments, so that the plurality of ultra-wideband pulses are combined into a high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, and realizing the interference of the navigation receiver to be interfered, so that the navigation receiver to be interfered performs an anti-interference test according to the high-repetition-frequency ultra-wideband pulse after receiving the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of first transmission instants. The embodiment of the invention can improve the interference effect on the navigation receiver.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to an anti-interference test method and device for navigation.
Background
The GNSS interference technology mainly includes blocking interference and tracking interference. The blocking interference is to emit some interference signal to shield the frequency spectrum of enemy signal in some way, and to suppress the GPS satellite signal reaching the antenna end of the navigation receiver, so that the enemy navigation receiver cannot correctly receive the GPS satellite signal and cannot position, and thus the enemy navigation receiver can reduce or completely lose normal working capacity. The tracking interference means that a false signal with the same parameter as the GPS signal is transmitted to interfere the navigation receiver, so that the navigation receiver generates wrong positioning information, and the function of the tracking interference is equivalent to that of a pseudo GPS satellite.
With the development of anti-interference technology, the existing blocking interference and tracking interference are increasingly limited, and a large number of corresponding anti-interference technical research results of navigation receivers exist. For example, the adaptive nulling technique and the digital beam forming have good prevention effect on blocking type interference, and the high-speed frequency hopping technique has good prevention effect on tracking type interference, so that the anti-interference test on the navigation receiver mainly aims at the blocking type interference and the tracking type interference. However, the existing anti-interference test cannot resist signal interference other than blocking interference and tracking interference, so that the comprehensiveness of the anti-interference test is low, the anti-interference accuracy is not high, and the anti-interference effect is poor.
Disclosure of Invention
The embodiment of the invention provides a navigation anti-interference test method and device, which improve the comprehensiveness of anti-interference test, thereby improving the anti-interference effect of a navigation receiver.
A first aspect of an embodiment of the present application provides an anti-interference testing method for navigation, including:
acquiring a first position of a navigation receiver to be interfered and second positions of a plurality of aerial platforms; wherein, a plurality of aerial platforms are all provided with ultra-wideband electromagnetic pulse sources;
calculating a plurality of first transmission moments according to the first position and the second position;
controlling a plurality of aerial platforms to send a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to a plurality of first sending moments, so that the plurality of ultra-wideband pulses are combined into a high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, and realizing the interference of the navigation receiver to be interfered, so that the navigation receiver to be interfered performs an anti-interference test according to the high-repetition-frequency ultra-wideband pulse after receiving the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of first transmission instants.
In a possible implementation manner of the first aspect, after a plurality of ultra-wideband pulses are synthesized into one high repetition frequency ultra-wideband pulse at a third position, the ultra-wideband pulse enters the navigation receiver to be interfered, so as to realize interference on the navigation receiver to be interfered, specifically:
after the navigation receiver to be interfered receives a high-repetition-frequency ultra-wideband pulse, the instantaneous power level of the navigation receiver to be interfered is larger than a preset value, so that after a semiconductor device in the navigation receiver to be interfered generates high-order harmonics, the navigation receiver to be interfered is in a saturated state, and the interference of the navigation receiver to be interfered is realized.
In a possible implementation manner of the first aspect, the sending, by the multiple aerial platforms, the multiple ultra-wideband pulses to the third location through the ultra-wideband electromagnetic pulse source according to the multiple first sending moments specifically includes:
the plurality of aerial platforms radiate a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source and an ultra-wideband antenna according to a plurality of first transmitting moments; the ultra-wideband antenna is arranged on a plurality of aerial platforms.
In one possible implementation manner of the first aspect, the repetition frequency threshold of the high repetition frequency ultra-wideband pulse is 300-500 kHz.
A second aspect of the embodiments of the present application provides an anti-interference testing apparatus for navigation, including: the system comprises an acquisition module, a calculation module and an anti-interference test;
the acquisition module is used for acquiring a first position of a navigation receiver to be interfered and second positions of a plurality of aerial platforms; wherein, a plurality of aerial platforms are all provided with ultra-wideband electromagnetic pulse sources;
the calculation module is used for calculating a plurality of first transmitting moments according to the first position and the second position;
the anti-interference test is used for controlling the plurality of aerial platforms to send a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to a plurality of first sending moments so that the plurality of ultra-wideband pulses are synthesized into a high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, and the interference of the navigation receiver to be interfered is realized, so that the navigation receiver to be interfered carries out the anti-interference test according to the high-repetition-frequency ultra-wideband pulse after receiving the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of first transmission instants.
In a possible implementation manner of the second aspect, after a plurality of ultra-wideband pulses are synthesized into one high repetition frequency ultra-wideband pulse at the third position, the ultra-wideband pulse enters the navigation receiver to be interfered, so as to realize interference of the navigation receiver to be interfered, specifically:
after the navigation receiver to be interfered receives a high-repetition-frequency ultra-wideband pulse, the instantaneous power level of the navigation receiver to be interfered is larger than a preset value, so that after a semiconductor device in the navigation receiver to be interfered generates high-order harmonics, the navigation receiver to be interfered is in a saturated state, and the interference of the navigation receiver to be interfered is realized.
In a possible implementation manner of the second aspect, the sending, by the multiple aerial platforms, the multiple ultra-wideband pulses to the third location through the ultra-wideband electromagnetic pulse source according to the multiple first sending moments specifically includes:
the plurality of aerial platforms radiate a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source and an ultra-wideband antenna according to a plurality of first transmitting moments; the ultra-wideband antenna is arranged on a plurality of aerial platforms.
In one possible implementation manner of the second aspect, the repetition frequency threshold of the high repetition frequency ultra-wideband pulse is 300-500 kHz.
Compared with the prior art, the navigation anti-interference test method and the navigation anti-interference test device provided by the embodiment of the invention have the advantages that the first position of the navigation receiver to be interfered and the second positions of a plurality of aerial platforms are obtained firstly; wherein, a plurality of aerial platforms are all provided with ultra-wideband electromagnetic pulse sources; calculating a plurality of first transmitting moments according to the first position and the second position; finally, the plurality of aerial platforms are controlled to send a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to a plurality of first sending moments, so that the plurality of ultra-wideband pulses are combined into a high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, interference of the navigation receiver to be interfered is realized, and after the navigation receiver to be interfered receives the high-repetition-frequency ultra-wideband pulse, an anti-interference test is carried out according to the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of first transmission instants.
The beneficial effects are that:
because the anti-interference technology in the prior art is mainly used for resisting interference signals/false signals with lower power, and the navigation receiver to be interfered still works in a linear region after receiving the interference signals/false signals, namely the prior anti-interference technology can only solve the problem that the navigation receiver is interfered when working in the linear region; the existing anti-jamming technology will lose the countermeasures and precautionary ability when facing the situation that the navigation receiver is in the saturation state due to being interfered.
The embodiment of the invention can send a plurality of ultra-wideband pulses to the third position at the first sending moment through a plurality of aerial platforms provided with ultra-wideband electromagnetic pulse sources, so that the plurality of ultra-wideband pulses are synthesized into a high-repetition-frequency ultra-wideband pulse at the third position and then enter the navigation receiver to be interfered, the input power of a semiconductor device in the navigation receiver to be interfered is instantaneously increased to instantaneously generate a deep saturation effect, and the navigation receiver to be interfered is in a saturated state and cannot effectively amplify normal GPS signals, and finally the navigation receiver to be interfered cannot normally work due to serious interference. Therefore, the invention provides a novel interference mode different from blocking interference and tracking interference when a navigation anti-interference test is carried out, and the novel interference mode can enable a navigation receiver to be in a saturated state due to interference; therefore, based on the novel interference mode, the anti-interference test is carried out, the condition that the navigation receiver is in a saturated state due to interference is considered, the limitation of the existing anti-interference technology can be overcome, the comprehensiveness of the navigation anti-interference test is improved, and the anti-interference accuracy is improved, so that the anti-interference effect is better.
In addition, because the ultra-wideband antenna is arranged on a plurality of aerial platforms, distributed interference based on the aerial platforms is formed, the concealment of the interference is improved, and the interference range is expanded. Therefore, the anti-interference test based on the interference mode can improve the resistance to the interference technology with high concealment and wide range.
Finally, because the aerial platforms have the characteristics of large quantity and wide distribution, the ultra-wideband electromagnetic pulse source arranged on each aerial platform can ensure the synthetic effect of high-repetition-frequency ultra-wideband pulses without overhigh power, thereby reducing the transformation difficulty of the aerial platforms and reducing the difficulty of the anti-interference test process.
Drawings
FIG. 1 is a flowchart illustrating a navigation anti-interference testing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an operating region of a navigation receiver to be interfered according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a navigation anti-interference testing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, which is a schematic flow chart of a navigation anti-interference testing method according to an embodiment of the present invention, the method includes steps S101 to S103:
s101: a first location of a navigation receiver to be interfered with and a second location of a plurality of airborne platforms are obtained.
Wherein, a plurality of aerial platforms are provided with ultra-wideband electromagnetic pulse sources;
s102: a plurality of first transmit times are calculated based on the first location and the second location.
S103: and controlling the plurality of aerial platforms to send a plurality of ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to a plurality of first sending moments so that the plurality of ultra-wideband pulses are combined into a high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, and realizing the interference of the navigation receiver to be interfered so that the navigation receiver to be interfered performs an anti-interference test according to the high-repetition-frequency ultra-wideband pulse after receiving the high-repetition-frequency ultra-wideband pulse.
Wherein the third position is calculated from the first position and a plurality of the first transmission times. Specifically, firstly, the plurality of air platforms transmit the plurality of ultra-wideband pulses to the third position through the ultra-wideband electromagnetic pulse source according to the plurality of first transmission moments, so that the calculation of the third position is based on the plurality of first transmission moments, so as to ensure that the plurality of ultra-wideband pulses transmitted by the plurality of air platforms according to the plurality of first transmission moments can reach the third position at the same time. Secondly, after the multiple ultra-wideband pulses reach the third position at the same time, a high-repetition-frequency ultra-wideband pulse needs to be synthesized and enters the navigation receiver to be interfered, so the calculation of the third position is based on the first position, that is, the linear distance between the third position and the first position needs to be smaller than a preset threshold value, so that the multiple ultra-wideband pulses can smoothly enter the navigation receiver to be interfered at the first position after the multiple ultra-wideband pulses are synthesized into the high-repetition-frequency ultra-wideband pulse at the third position. In summary, the third position is calculated from the first position and the plurality of first transmission moments.
In this embodiment, the plurality of ultra-wideband pulses are synthesized into one high repetition frequency ultra-wideband pulse at the third position and then enter the navigation receiver to be interfered, so as to interfere with the navigation receiver to be interfered, specifically:
after the navigation receiver to be interfered receives one high-repetition-frequency ultra-wideband pulse, the instantaneous power level of the navigation receiver to be interfered is larger than a preset value, so that after a semiconductor device in the navigation receiver to be interfered generates high-order harmonics, the navigation receiver to be interfered is in a saturated state, and the navigation receiver to be interfered is interfered.
Wherein the preset value is the receiving sensitivity of the navigation receiver to be interfered.
In a specific embodiment, the semiconductor device in the navigation receiver to be interfered includes: amplifiers, mixers, and the like.
In this embodiment, the sending, by the plurality of aerial platforms, a plurality of ultra-wideband pulses to a third location through the ultra-wideband electromagnetic pulse source according to the plurality of first sending times specifically includes:
the plurality of aerial platforms radiate a plurality of ultra-wideband pulses to the third position through the ultra-wideband electromagnetic pulse source and the ultra-wideband antenna according to a plurality of first transmitting moments; wherein the ultra-wideband antenna is disposed on the plurality of aerial platforms.
In this embodiment, the repetition frequency threshold of the high repetition frequency ultra-wideband pulse is 300 to 500 kHz.
To further illustrate the interference principle of the high repetition frequency ultra-wideband pulse on navigation, please refer to fig. 2, and fig. 2 is a schematic diagram of the working area of a navigation receiver to be interfered according to an embodiment of the present invention. Wherein the ordinate of fig. 2 is the output power P of the semiconductor device in the navigation receiver to be interfered withoutThe ordinate of FIG. 2 is the pilot to be interfered withInput power P of semiconductor device in aerial receiverin. Under the condition of normal signal input, the input power is low, the semiconductor device is in a linear working state, the normal signal is effectively amplified, and the navigation receiver to be interfered normally works; with the increase of the input power, the semiconductor device enters a nonlinear working saturation region, the output signal and the input signal are no longer in a linear relation, a saturation effect is generated, and the navigation receiver to be interfered is in a saturation state and loses working capacity.
Existing navigational jamming techniques include mainly jamming and tracking jamming. The blocking interference is that a navigation receiver to be interfered cannot correctly receive a GPS satellite signal and cannot be positioned by transmitting a certain interference signal, so that the normal working capacity of the navigation receiver is reduced or completely lost; the tracking interference interferes the navigation receiver to be interfered by transmitting a false signal with the same parameter as the GPS signal, so that the navigation receiver to be interfered can not work normally due to the generation of wrong positioning information. As can be seen from the above, the existing navigation interference technology implements interference on the navigation receiver to be interfered by sending the interference signal/glitch, and the power of the interference signal/glitch is low, so that the navigation receiver to be interfered still operates in the linear region as shown in fig. 2 even after receiving the interference signal/glitch.
At present, the self-adaptive zeroing technology and the digital beam forming have good prevention effect on blocking type interference, and the high-speed frequency hopping technology has good countermeasure effect on tracking type interference. However, the existing anti-interference test cannot resist signal interference other than blocking interference and tracking interference, so that the comprehensiveness of the anti-interference test is low, the anti-interference accuracy is not high, and the anti-interference effect is poor. Therefore, the invention provides a novel interference mode different from blocking interference and tracking interference according to the defects that in the prior art, after receiving an interference signal/false signal, a navigation receiver to be interfered still works in a linear region and a semiconductor device enters a nonlinear working saturation region, an output signal and an input signal are no longer in a linear relationship to generate a saturation effect, and the navigation receiver to be interfered is in a saturation state and loses working capacity, aiming at enabling the navigation receiver to be in the saturation state, and the invention can consider the condition that the navigation receiver is in the saturation state due to interference and carry out anti-interference test based on the novel interference mode, thereby improving the comprehensiveness of the anti-interference test and improving the anti-interference effect of the navigation receiver.
Wherein, the novel interference mode specifically is:
since "putting the navigation receiver to be interfered in a saturation state" requires an increasing/instantaneous increase in input power of the semiconductor device in the navigation receiver to be interfered to bring the semiconductor device into a saturation region of nonlinear operation, it is necessary to input an ultra-wideband electromagnetic pulse to the navigation receiver to be interfered. The ultra-wideband electromagnetic pulse is emitted by an ultra-wideband electromagnetic pulse source, the ultra-wideband electromagnetic pulse source can emit megawatt electromagnetic pulse signals for more than ten thousand times per second, and the signal bandwidth coverage is 30MHz-3 GHz.
But because the spread spectrum gain of the GPS signal is high: the bandwidth of the data code is 100Hz, after the C/A code is modulated by the data code, the bandwidth of the combined code of the data code and the C/A code is expanded to 2.046MHz, the spread spectrum gain is 20460, so that the energy of the transmitted GPS signal is very weak, and the intensity is not changed greatly, therefore, even if the ultra-wideband electromagnetic pulse is input to the navigation receiver to be interfered, and the semiconductor device enters a saturation region of nonlinear operation, the GPS signal can still be amplified normally and linearly.
In order to ensure that the GPS signal cannot be linearly amplified, the semiconductor device needs to enter a deep saturation effect, thereby improving the interference effect. The semiconductor device generates a deep saturation effect, ultra-wideband pulse interference with higher power is needed, the power and the repetition frequency of a single ultra-wideband electromagnetic pulse source are limited, the attack effect of a navigation receiver to be interfered is poor, and after a plurality of pulse sources are distributed, combined attack can be carried out through the plurality of pulse sources, so that the repetition frequency and the amplitude are improved. When the repetition frequency reaches 300-500 kHz (namely, the repetition frequency threshold is met), full-time saturation suppression can be realized on the navigation receiver.
Because the aerial platforms have the characteristics of large quantity and wide distribution, the whole earth can be covered, the ultra-wideband electromagnetic pulse source is arranged on the aerial platforms above the navigation receiver to be interfered, the distributed interference based on the aerial platforms can be realized, the interference concealment is improved, the interference range is expanded, and high-repetition-frequency ultra-wideband pulses can be synthesized.
Because the repetition frequency and the power of the high-repetition-frequency ultra-wideband pulse are far higher than those of a single ultra-wideband pulse, after the high-repetition-frequency ultra-wideband pulse enters the navigation receiver to be interfered through the antenna, the instantaneous power of the navigation receiver to be interfered (namely the input power of a semiconductor device in the navigation receiver to be interfered) is far higher than the receiving sensitivity of the receiver, a deep saturation effect is caused in the semiconductor device, and thus higher harmonics are generated. Then, through further delay broadening effects such as filtering, amplification, frequency mixing and the like, the navigation receiver to be interfered is in a saturated state, and the control voltage output by Automatic Gain Control (AGC) of the navigation receiver to be interfered is greatly reduced in a longer time, so that the gain of the navigation receiver to be interfered is greatly reduced. Before the AGC control voltage is recovered to a normal state, the useful signal can not be effectively amplified, so that the interference suppression of the navigation receiver to be interfered is realized.
In one embodiment, the receive sensitivity threshold of a typical navigation receiver is: the dynamic range is generally 70 dB to 90dB, and the dynamic range is between-90 dBm and-120 dBm. When the input power of the semiconductor device in the navigation receiver is greater than the sensitivity (for example, the sensitivity is 50-60 dB), the semiconductor device in the navigation receiver enters a nonlinear region; the semiconductor device in the navigation receiver enters a saturation region when the input power is greater than 0dBm to-20 dBm.
To further explain the navigation jamming device, please refer to fig. 3, where fig. 3 is a schematic structural diagram of a navigation anti-jamming testing device according to an embodiment of the present invention, including: an acquisition module 301, a calculation module 302 and an anti-interference test module 303.
The acquiring module 301 is configured to acquire a first position of a navigation receiver to be interfered and second positions of a plurality of aerial platforms; wherein, a plurality of aerial platforms are provided with ultra-wideband electromagnetic pulse sources;
the calculating module 302 is configured to calculate a plurality of first transmission moments according to the first position and the second position;
the anti-interference test module 303 is configured to control the multiple aerial platforms to send multiple ultra-wideband pulses to a third location through the ultra-wideband electromagnetic pulse source according to multiple first sending times, so that the multiple ultra-wideband pulses are combined into one high-repetition-frequency ultra-wideband pulse at the third location and then enter the navigation receiver to be interfered, thereby implementing interference on the navigation receiver to be interfered, and enabling the navigation receiver to be interfered to perform an anti-interference test according to the high-repetition-frequency ultra-wideband pulse after receiving the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of the first transmission times.
In this embodiment, the plurality of ultra-wideband pulses are synthesized into one high repetition frequency ultra-wideband pulse at the third position and then enter the navigation receiver to be interfered, so as to interfere with the navigation receiver to be interfered, specifically:
after the navigation receiver to be interfered receives one high-repetition-frequency ultra-wideband pulse, the instantaneous power level of the navigation receiver to be interfered is larger than a preset value, so that after a semiconductor device in the navigation receiver to be interfered generates high-order harmonics, the navigation receiver to be interfered is in a saturated state, and the navigation receiver to be interfered is interfered.
In this embodiment, the sending, by the plurality of aerial platforms, a plurality of ultra-wideband pulses to a third location through the ultra-wideband electromagnetic pulse source according to the plurality of first sending times specifically includes:
the plurality of aerial platforms radiate a plurality of ultra-wideband pulses to the third position through the ultra-wideband electromagnetic pulse source and the ultra-wideband antenna according to a plurality of first transmitting moments; wherein the ultra-wideband antenna is disposed on the plurality of aerial platforms.
In this embodiment, the repetition frequency threshold of the high repetition frequency ultra-wideband pulse is 300 to 500 kHz.
The embodiment of the invention firstly obtains a first position of a navigation receiver to be interfered and second positions of a plurality of aerial platforms through an obtaining module 301; wherein, a plurality of aerial platforms are all provided with ultra-wideband electromagnetic pulse sources; calculating a plurality of first transmitting moments according to the first position and the second position through a calculating module 302; finally, the anti-interference test module 303 controls the multiple aerial platforms to send multiple ultra-wideband pulses to a third position through an ultra-wideband electromagnetic pulse source according to multiple first sending moments, so that the multiple ultra-wideband pulses are combined into one high-repetition-frequency ultra-wideband pulse at the third position and then enter a navigation receiver to be interfered, interference of the navigation receiver to be interfered is achieved, and anti-interference test is carried out on the navigation receiver to be interfered according to the high-repetition-frequency ultra-wideband pulse after the navigation receiver to be interfered receives the high-repetition-frequency ultra-wideband pulse; wherein the third position is calculated from the first position and a plurality of first transmission instants.
The beneficial effects are that: because the anti-interference technology in the prior art is mainly used for resisting interference signals/false signals with lower power, and the navigation receiver to be interfered still works in a linear region after receiving the interference signals/false signals, namely the prior anti-interference technology can only solve the problem that the navigation receiver is interfered when working in the linear region; the existing anti-jamming technology will lose the countermeasures and precautionary ability when facing the situation that the navigation receiver is in the saturation state due to being interfered.
The embodiment of the invention can send a plurality of ultra-wideband pulses to the third position at the first sending moment through a plurality of aerial platforms provided with ultra-wideband electromagnetic pulse sources, so that the plurality of ultra-wideband pulses are synthesized into a high-repetition-frequency ultra-wideband pulse at the third position and then enter the navigation receiver to be interfered, the input power of a semiconductor device in the navigation receiver to be interfered is instantaneously increased to instantaneously generate a deep saturation effect, and the navigation receiver to be interfered is in a saturated state and cannot effectively amplify normal GPS signals, and finally the navigation receiver to be interfered cannot normally work due to serious interference. Therefore, the invention provides a novel interference mode different from blocking interference and tracking interference when a navigation anti-interference test is carried out, and the novel interference mode can enable a navigation receiver to be in a saturated state due to interference; therefore, based on the novel interference mode, the anti-interference test is carried out, the condition that the navigation receiver is in a saturated state due to interference is considered, the limitation of the existing anti-interference technology can be overcome, the comprehensiveness of the navigation anti-interference test is improved, and the anti-interference accuracy is improved, so that the anti-interference effect is better.
In addition, because the ultra-wideband antenna is arranged on a plurality of aerial platforms, distributed interference based on the aerial platforms is formed, the concealment of the interference is improved, and the interference range is expanded. Therefore, the anti-interference test based on the interference mode can improve the resistance to the interference technology with high concealment and wide range.
Finally, because the aerial platforms have the characteristics of large quantity and wide distribution, the ultra-wideband electromagnetic pulse source arranged on each aerial platform can ensure the synthetic effect of high-repetition-frequency ultra-wideband pulses without overhigh power, thereby reducing the transformation difficulty of the aerial platforms and reducing the difficulty of the anti-interference test process.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
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