CN115657085A - Multichannel anti-interference device and signal processing method - Google Patents
Multichannel anti-interference device and signal processing method Download PDFInfo
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Abstract
The application discloses a multichannel anti-jamming device and a signal processing method. Wherein the apparatus comprises: the array antenna module is used for receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite to obtain receiving signals; the switching module is used for generating switching information data according to the receiving signal; the switching module is also used for determining a target output port of the switching module according to the switching information data and outputting the received signal through the target output port; the radio frequency front end receiving channel module is used for processing the receiving signal to obtain radio frequency signal data; the multi-channel anti-interference frequency conversion module is used for processing the radio frequency signal data to obtain analog intermediate frequency signal data; the anti-interference baseband module is used for processing the analog intermediate frequency signal data according to the switching information data to obtain digital intermediate frequency signal data; and the navigation baseband module is used for processing the digital intermediate frequency signal data according to the switching information data to obtain navigation data so as to improve the navigation positioning capability.
Description
Technical Field
The application relates to the technical field of satellite navigation receiving, in particular to a multi-channel anti-jamming device and a signal processing method.
Background
Since the first global satellite navigation system in the world of the 90 th of the 20 th century was built and provided with services, through the development of the last 30 years, a GNSS system can provide positioning accuracy of more than meter for users in the global scope, has been widely applied to the fields of transportation, communication systems, geographical mapping and the like, and becomes an important space infrastructure for economic and military development. With the gradual expansion of the application field and the continuous increase of the user demand, the vulnerability of the satellite navigation signal gradually emerges. Firstly, the navigation message rate of the GNSS system is low, so that the improvement of the system service precision is limited; secondly, the signal landing power of the GNSS system is low, only about-130 dBmW, and under a complex terrain environment, wide-area seamless high-performance position service is difficult to provide; in addition, the navigation signal has a frequency point and a public structure, is easy to be deceived and interfered, and has to be improved in service performance under a complex electromagnetic countermeasure environment. In summary, the GNSS has a problem of insufficient availability in special field applications and complex environments, and service accuracy, reliability and interference resistance are all to be enhanced.
The height of the low-orbit satellite orbit does not exceed 2000km, and compared with a medium-high orbit navigation satellite with the height above 20000km, the low-orbit satellite signal transmission path is shorter, and the signal delay and the power loss are smaller. If the low and medium-high orbit satellites transmit the same signal power, the signal power transmitted by the low orbit satellite that reaches the surface of the earth will be 30dB (i.e., 1000 times) higher than that transmitted by the medium-high orbit satellite. Stronger ground signal power can improve the effect of location under complicated topography environment and complicated electromagnetic environment, promotes anti-interference and anti-deception ability. The change of the geometrical configuration of the medium and high orbit satellites is slow, the time of one circle of the low orbit satellites around the earth is far shorter than that of the medium and high orbit satellites, the track drawn in the same time period is longer, and the convergence time of high-precision positioning is accelerated due to the orbital characteristics of the low orbit satellites. Low earth orbit satellites are expected to be a new increment for the development of next generation satellite navigation systems by virtue of the unique advantages of their orbits and signals. The low earth orbit satellite can enhance the satellite navigation signal in a forwarding/broadcasting mode to be used as the enhancement and supplement of a Global Navigation Satellite System (GNSS), and can broadcast an independent ranging signal to form the backup positioning navigation capability.
In the process of realizing the prior art, the inventor finds that:
the research on improving the navigation positioning accuracy and reducing the convergence time by fusing the low-orbit satellite and the medium-high orbit satellite is more, but the research on designing the suppression interference resistant terminal of the low-medium and high-orbit fusion navigation system is relatively less, and the anti-interference capability of the low-medium and high-orbit fusion navigation system needs to be improved.
Therefore, it is desirable to provide a navigation signal receiving apparatus for autonomously switching a radio frequency front end circuit, which improves the anti-interference capability of a terminal in a complex environment.
Disclosure of Invention
The embodiment of the application provides a relevant technical scheme of a navigation signal receiving device of an autonomous switching radio frequency front-end circuit, which can improve the anti-jamming capability of a terminal in a complex environment, and is used for solving the technical problem that the anti-jamming capability of the existing low-medium high-orbit fusion navigation system needs to be improved.
The application provides a multichannel anti jamming unit, includes:
the array antenna module is used for receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite to obtain receiving signals;
the switching module is electrically connected with the array antenna module and used for generating switching information data according to the received signals; the switching module is also used for determining a target output port of the switching module according to the switching information data and outputting the received signal through the target output port;
the radio frequency front end receiving channel module is electrically connected with the switching module and is used for processing the receiving signal to obtain radio frequency signal data;
the multi-channel anti-interference frequency conversion module is electrically connected with the radio frequency front end receiving channel module and is used for processing the radio frequency signal data to obtain analog intermediate frequency signal data;
the anti-interference baseband module is electrically connected with the switching module and the multi-channel anti-interference frequency conversion module and is used for processing the analog intermediate-frequency signal data according to the switching information data to obtain digital intermediate-frequency signal data;
and the navigation baseband module is electrically connected with the switching module and the anti-interference baseband module and is used for processing the digital intermediate-frequency signal data according to the switching information data to obtain navigation data.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
Further, the array antenna module includes N array antenna units, the received signal includes N sub-received signals respectively received by the N array antenna units, the switching module includes a switching judgment circuit unit and N power detection switching circuit units, and the radio frequency front end receiving channel module includes N receiving channel units;
the switching judgment circuit unit is electrically connected with the N power detection switching circuit units, the anti-interference baseband module and the navigation baseband module;
the Nth power detection switching circuit unit is electrically connected with the Nth array antenna unit and the Nth receiving channel unit;
the N power detection switching circuit units are used for respectively detecting the N sub-receiving signals to obtain N detection powers;
the switching judgment circuit unit is used for generating switching information data according to the N detection powers;
the N power detection switching circuit units are used for uniformly determining N target output ports of the N power detection switching circuit units according to the switching information data and outputting the N sub-receiving signals through the N target output ports;
the N receiving channel units are used for respectively processing the N sub-receiving signals to obtain N radio frequency signal data;
wherein N is a positive integer.
Further, the power detection switching circuit unit comprises a power detection circuit and a radio frequency switch;
the power detection circuit is used for detecting the power of the sub-received signals to obtain detection power;
the radio frequency switch is used for determining a target output port of the power detection switching circuit unit according to the switching information data and outputting the sub-receiving signal through the target output port.
Further, the radio frequency switch comprises a first input end, a second input end, a first output end and a second output end;
the receiving channel unit comprises a first receiving channel and a second receiving channel;
the first output end is electrically connected with the first receiving channel, and the second output end is electrically connected with the second receiving channel;
the first input terminal is configured to receive the sub-received signal, and the second input terminal is configured to receive the handover information data;
and the radio frequency switch switches the connection relation among the first input end, the first output end and the second output end according to the switching information data, and determines a target output port from the first output end and the second output end.
Furthermore, the multi-channel anti-interference frequency conversion module comprises a first multi-channel anti-interference frequency conversion unit and a second multi-channel anti-interference frequency conversion unit;
the first multi-channel anti-interference frequency conversion unit is electrically connected with the first receiving channel, and the second multi-channel anti-interference frequency conversion unit is electrically connected with the second receiving channel;
the first multi-channel anti-interference frequency conversion unit and the second multi-channel anti-interference frequency conversion unit are respectively electrically connected with the anti-interference baseband module.
The application also provides a signal processing method applied to the multichannel anti-jamming device, which comprises the following steps:
receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite through the array antenna module to obtain receiving signals;
generating switching information data through the switching module according to the receiving signal;
determining a target output port of the switching module according to the switching information data, and outputting the received signal through the target output port;
processing the received signal through the radio frequency front end receiving channel module to obtain radio frequency signal data;
processing the radio frequency signal data through the multi-channel anti-interference frequency conversion module to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module according to the switching information data to obtain navigation data.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
The application also provides another signal processing method, which is applied to a multi-channel anti-interference device and comprises the following steps:
receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite through the N array antenna units to obtain N sub-receiving signals;
respectively detecting the N sub-receiving signals through the N power detection switching circuit units to obtain N detection powers;
processing the N detection powers through the switching judgment circuit unit to generate switching information data;
determining N target output ports of the N power detection switching circuit units according to the switching information data, and outputting the N sub-receiving signals through the N target output ports;
respectively processing the N sub-receiving signals through the N receiving channel units to obtain N radio frequency signal data;
processing the N radio frequency signal data through the multi-channel anti-interference frequency conversion module to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module according to the switching information data to obtain navigation data.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
The embodiment provided by the application has at least the following beneficial effects:
by fully utilizing the characteristics of low-orbit satellites and medium-orbit satellite navigation signals, the anti-interference capability of the terminal in a complex environment is improved, so that the positioning capability of the navigation receiving terminal under the condition of suppressing the interference signals by high power is improved.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic diagram of a multi-channel anti-jamming device according to an embodiment of the present application;
fig. 2 is a connection block diagram of a multi-channel anti-interference apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic block diagram of a multi-channel anti-interference apparatus according to an embodiment of the present disclosure;
fig. 4 is a power detection switching block diagram according to an embodiment of the present disclosure.
11. An array antenna module; 12. a switching module; 13. the radio frequency front end receives the channel module; 14. a multi-channel anti-interference frequency conversion module; 15. an anti-interference baseband module; 16. a navigation baseband module; 100. multichannel anti jamming unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1 and fig. 2, the present application provides a multi-channel interference rejection apparatus 100, including:
the array antenna module 11 is used for receiving the transmitting signals of the low-orbit satellite and the medium-high orbit satellite to obtain receiving signals;
a switching module 12 electrically connected to the array antenna module 11, configured to generate switching information data according to the received signal; the switching module is also used for determining a target output port of the switching module according to the switching information data and outputting the received signal through the target output port;
the radio frequency front end receiving channel module 13 is electrically connected with the switching module and is used for processing the receiving signals to obtain radio frequency signal data;
the multi-channel anti-interference frequency conversion module 14 is electrically connected with the radio frequency front end receiving channel module and is used for processing the radio frequency signal data to obtain analog intermediate frequency signal data;
the anti-interference baseband module 15 is electrically connected with the switching module and the multi-channel anti-interference frequency conversion module and is used for processing the analog intermediate-frequency signal data according to the switching information data to obtain digital intermediate-frequency signal data;
and the navigation baseband module 16 is electrically connected with the switching module and the anti-interference baseband module and is used for processing the digital intermediate frequency signal data according to the switching information data to obtain navigation data.
It should be noted that the array antenna module 11 is composed of a plurality of low-orbit signal receiving antennas and GNSS signal receiving antennas, and is used for receiving navigation and navigation enhancement signals transmitted by low-orbit and medium-high orbit satellites. The navigation and navigation enhancement signals here may be understood as transmitted signals. The switching module 12 can detect the received signal and generate corresponding switching information data according to the detection result in a preset manner. The switching module 12 here also comprises two output ports. One of the output ports may be selected as a target output port according to the switching information data, and the line may be switched to the target output port. Here, line switching is understood to mean that a line between the reception signal and the target output port is on and the remaining lines are off. Line switching here is also understood to mean routing a received signal to a target output port. The rf front end receiving channel module 13 may also be understood as an rf front end receiving channel, and may process the received signal through a built-in receiving channel to obtain corresponding rf signal data. The radio frequency signal data herein may be understood as a radio frequency signal. The multi-channel anti-interference frequency conversion module 14 performs single-to-differential, down-conversion, intermediate frequency amplification, differential to single conversion, and intermediate frequency filtering on the radio frequency signal amplified by the antenna and the radio frequency front end to complete analog down-conversion processing, so as to obtain an analog intermediate frequency signal. The analog intermediate frequency signal is understood here to mean analog intermediate frequency signal data. The anti-interference baseband module 15 can be understood as an anti-interference baseband, and switches to a preset processing mode in advance according to the switching information data, performs analog-to-digital conversion, digital down conversion, anti-interference processing and digital signal quantization on the received analog intermediate frequency signal to obtain a digital intermediate frequency signal without interference, and sends the digital intermediate frequency signal to the baseband processing module. The digital if signal is understood to be digital if signal data, and the baseband processing module is understood to be the navigation baseband module 16. The navigation baseband module 16 switches to a preset processing mode in advance according to the switching information data, performs capturing, tracking, pseudo-range measurement, carrier phase measurement, doppler measurement, navigation message demodulation and conversion, and signal quality monitoring on the digital intermediate frequency signal without interference, completes receiving measurement, loop state indication, multi-path suppression, and channel delay monitoring of the multi-system navigation signal, despreads and demodulates original observation data, navigation messages, and state parameters, and obtains final navigation data.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
It can be understood that when receiving the transmitted signal composed of the navigation and navigation enhancement signals transmitted by the low-orbit and medium-and high-orbit satellites, the received signal inevitably receives the influence of the external environment, and the received signal includes various interference signals besides the navigation signal and the navigation enhancement signal.
Further, the array antenna module 11 includes N array antenna units, the received signal includes N sub-received signals respectively received by the N array antenna units, the switching module 12 includes a switching judgment circuit unit and N power detection switching circuit units, and the radio frequency front end receiving channel module 13 includes N receiving channel units;
the switching judgment circuit unit is electrically connected with the N power detection switching circuit units, the anti-interference baseband module 15 and the navigation baseband module 16;
the Nth power detection switching circuit unit is electrically connected with the Nth array antenna unit and the Nth receiving channel unit;
the N power detection switching circuit units are used for respectively detecting the N sub-receiving signals to obtain N detection powers;
the switching judgment circuit unit is used for generating switching information data according to the N detection powers;
the N power detection switching circuit units are used for uniformly determining N target output ports of the N power detection switching circuit units according to the switching information data and outputting the N sub-receiving signals through the N target output ports;
the N receiving channel units are used for respectively processing the N sub-receiving signals to obtain N radio frequency signal data;
wherein N is a positive integer.
It should be noted that the array antenna unit here is composed of a low-orbit signal receiving antenna and a GNSS signal receiving antenna. Referring to fig. 3, the array antenna module 11 is composed of N array antenna units Y1 to Yn, and each array antenna unit can receive a sub-received signal. The switching module 12 is composed of N power detection switching circuit units from the switching judgment circuit unit and the power detection switching circuit 1 to the power detection switching circuit N.
Further, referring to fig. 4, the power detection switching circuit unit includes a power detection circuit and a radio frequency switch;
the power detection circuit is used for detecting the power of the sub-received signals to obtain detection power;
the radio frequency switch is used for determining a target output port of the power detection switching circuit unit according to the switching information data and outputting the sub-receiving signal through the target output port.
It should be noted that the power detection switching circuit unit performs power detection on the signal received by the antenna and outputs the power detection signal to the switching judgment circuit unit, and receives the control of the switching judgment circuit unit to select and switch the receiving channel in the rf front end receiving channel module 13. The radio frequency switch is also called as a microwave switch, and realizes the function of controlling the conversion of microwave signal channels. After receiving the indication of each power detection switching circuit unit, the switching judgment circuit unit generates switching information data according to the signal power of the array antenna, so as to control the radio frequency switch to be switched on and switched on with the path between the target output port, and simultaneously, the switching information data is synchronized to the anti-interference baseband module 15 and the navigation baseband module 16.
Further, the radio frequency switch includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal;
the receiving channel unit comprises a first receiving channel and a second receiving channel;
the first output end is electrically connected with the first receiving channel, and the second output end is electrically connected with the second receiving channel;
the first input terminal is configured to receive the sub-received signal, and the second input terminal is configured to receive the switching information data;
and the radio frequency switch switches the connection relation among the first input end, the first output end and the second output end according to the switching information data, and determines a target output port from the first output end and the second output end.
Referring to fig. 3 and 4, the first input terminal may be understood as an RFin port, the second input terminal may be understood as a Dv In port, the first output terminal may be understood as an RFb port, and the second output terminal may be understood as an RFs port. The radio frequency front end receiving channel module 13 is composed of N receiving channel units from the 1 st receiving channel unit to the nth receiving channel unit, the 1 st receiving channel unit is composed of a receiving channel B1 and a receiving channel S1, the 2 nd receiving channel unit is composed of a receiving channel B2 and a receiving channel S2, and so on, and the nth receiving channel unit is composed of a receiving channel Bn and a receiving channel Sn. The receiving channels B1 to Bn may be understood as first receiving channels of corresponding receiving channel units, and the receiving channels S1 to Sn may be understood as second receiving channels of corresponding receiving channel units. The switching information data can be used for controlling the radio frequency switch to uniformly switch the corresponding radio frequency front end receiving circuit channel to the receiving channel Sn or the receiving channel Bn. The rf front end receive circuit path may be understood as a receive path unit. Each receiving channel unit at the radio frequency front end processes the navigation signal, the navigation enhancement signal and the interference signal received by the corresponding antenna.
Furthermore, the multi-channel anti-interference frequency conversion module comprises a first multi-channel anti-interference frequency conversion unit and a second multi-channel anti-interference frequency conversion unit;
the first multichannel anti-interference frequency conversion unit is electrically connected with the first receiving channel, and the second multichannel anti-interference frequency conversion unit is electrically connected with the second receiving channel;
the first multi-channel anti-interference frequency conversion unit and the second multi-channel anti-interference frequency conversion unit are respectively electrically connected with the anti-interference baseband module.
It should be noted that the first receiving channel here includes a receiving channel B1 to a receiving channel Bn, and the second receiving channel here includes a receiving channel S1 to a receiving channel Sn. Referring to fig. 3, the first multi-channel anti-interference frequency conversion unit can be understood as a multi-channel anti-interference frequency conversion 1, and the second multi-channel anti-interference frequency conversion unit can be understood as a multi-channel anti-interference frequency conversion 2. The receiving channels B1 to Bn are respectively connected to the multi-channel anti-interference frequency conversion 1, and the receiving channels S1 to Sn are respectively connected to the multi-channel anti-interference frequency conversion 2. In a specific embodiment, the navigation receiving terminal is powered on and started, the rf front end receiving channel module 13 starts the receiving channel S by default, that is, starts the receiving channel S1 to the receiving channel Sn by default, and closes the receiving channel B1 to the receiving channel Bn. And starting the anti-interference baseband module 15 and the navigation baseband module 16 to complete software self-checking and radio frequency hardware configuration. The power detection circuit in the power detection switching circuit unit of each channel detects the signal power of the sub-received signal received from each array antenna unit in the array antenna module 11, and the obtained detection power is sent to the switching judgment circuit unit to judge whether the detected power is greater than the switching threshold value. In a specific application scenario, when the detected power of any channel is greater than the switching threshold, all receiving channel units in the rf front-end receiving channel module 13 are switched to the receiving channel B, that is, switched to the receiving channel B1 to the receiving channel Bn, and the receiving channel S1 to the receiving channel Sn are closed. The anti-interference baseband module 15 switches to the low-orbit navigation signal anti-interference processing working mode, and the navigation baseband module 16 switches to the low-orbit navigation positioning working mode. In another specific application scenario, when the detection powers of all channels are smaller than the switching threshold, all receiving channel units in the rf front-end receiving channel module 13 keep the on state of the receiving channel S, that is, the receiving channels S1 to Sn all keep the on state, and the receiving channels S1 to Sn keep the off state. The interference rejection baseband module 15 detects whether interference is present. If interference exists, the anti-interference baseband module 15 is switched to a navigation signal anti-interference processing working mode, and the navigation baseband module 16 is switched to a low-orbit and medium-high orbit satellite fusion navigation positioning working mode; if no interference exists, the anti-interference baseband module 15 is switched to an anti-interference processing working mode, and the navigation baseband module is switched to a low-orbit satellite and medium-high orbit satellite fusion navigation positioning working mode.
Obviously, the navigation signal and the interference signal broadcast by the low-orbit and medium-high orbit satellites are received through the array antenna, the switching module 12 at the front end of the radio frequency detects the amplitude of the signal received by the antenna, preliminarily judges the strength of the interference signal according to the amplitude of the total power of the received signal, selects to switch and open the corresponding receiving channel, and synchronizes the channel selection signal to the anti-interference baseband module 15 and the navigation baseband module 16, so that the redundancy of radio frequency circuit and baseband processing can be avoided, and the array antenna has the advantages of simple design and low power consumption. The receiving channel unit in the radio frequency front end receiving channel module 13 is designed into two paths according to different interfered degrees of the navigation signal, and the two paths are respectively amplified, frequency-converted and filtered, so that the receiving channel unit has the high sensitivity capability of processing weak signals and the high dynamic capability of processing strong signals (interference signals), has a simple circuit structure and high reliability, and can greatly improve the anti-suppression interference capability of low-rail and medium-high rail navigation terminals.
It should be noted that, in a specific application scenario of the low-orbit and medium-high orbit satellite navigation fusion terminal, it is assumed that the landing power of the low-orbit satellite navigation signal is-100 dBm, the landing power of the medium-high orbit satellite navigation signal is-130 dBm, and the signal bandwidth BW is 20.46MHz. In the present application, a channel gain Gs of a radio frequency front end receiving channel S is 30dB, a noise factor NFs is 3dB, a channel gain Gb of a radio frequency front end receiving channel B is 5dB, and a noise factor NFb is 25dB. Assume that the dac uses 16bits of physical bits, 13bits of significant bits, a sampling rate of 100MSPS, a maximum input Padcmax of 10dBm, and a minimum input power Padcmin of-70 dBm. The general receiver adopts the radio frequency front end receiving channel gain G as 30dB, the noise coefficient NF as 3dB, the digital-to-analog converter adopts the physical digit 16bits, the effective digit 13bits, the sampling rate 100MSPS, the maximum input Padcmax as 16dBm, the minimum input power Padcmin as-67 dBm, and the design contrast of the application is taken as the result. The navigation signal adopts a spread spectrum system, and is transmitted in a long distance, the power of the navigation signal of the medium and high orbit satellite is submerged below noise, and the received signal is calculated by quantizing the noise power in the channel; the power of the low-orbit satellite navigation signals is slightly higher than the power of noise in the channels, and the received signals are calculated according to the actual signal power, namely the power PL of the low-orbit satellite navigation received signals reaching the antenna port of the receiver is-100 dBm, and the power PG of the medium-high orbit satellite navigation received signals reaching the noise in the channels of the antenna port of the receiver is-101 dBm. The radio frequency front end receiving channel filters, amplifies, frequency converts and analog-to-digital converts the navigation signal and the interference signal under the condition of keeping the amplitude-frequency characteristic of the signal unchanged, is the basis of demodulation of an anti-interference baseband and a navigation baseband, and can be specifically expressed by the following three formulas:
equation 1: padcmin is less than or equal to 10 × log (K × T × BW) + G + NF is less than or equal to Padcmax;
equation 2: pj + G is less than or equal to Padcmax;
equation 3: p-10 × log (K × T) -NF ≧ C/N (3).
Wherein, K represents Boltzmann constant, T represents temperature, BW represents signal bandwidth, G represents receiving channel gain, NF represents receiving channel noise coefficient, P represents signal power, pj represents interference signal power, C/N represents carrier-to-noise ratio, padcmin represents ADC minimum quantized power, and Padcmax represents ADC maximum input power.
Assuming that the minimum C/N of navigation signal demodulation is 30dB, 3dB anti-interference baseband processing loss is reserved. The interference signal and the navigation signal power of the general receiver are respectively substituted into the formula 1, the formula 2 and the formula 3 for calculation, and the maximum amplitude of the interference signal which can be processed by the general receiver is-20 dBm.
In the multi-channel anti-jamming device 100, namely the design scheme of the receiving terminal, the receiver defaults to adopt the receiving channel S, when the jamming power is larger than-25 dBm, the receiving channel S is switched to the receiving channel B and is respectively substituted into a formula 1 and a formula 2 for calculation, and the maximum amplitude capable of processing jamming signals in a medium-high and low-orbit navigation fusion receiving mode is-20 dBm. The maximum amplitude capable of processing interference signals in the low-orbit navigation receiving mode is +5dBm. Therefore, the technical scheme in the application can greatly improve the processing capacity of the interference signal.
The present application further provides a signal processing method, applied to the multi-channel anti-interference apparatus 100, including the following steps:
receiving the transmitting signals of the low-orbit and medium-high orbit satellites through the array antenna module 11 to obtain receiving signals;
generating switching information data by the switching module 12 according to the received signal;
determining a target output port of the switching module 12 according to the switching information data, and outputting the received signal through the target output port;
processing the received signal through the radio frequency front end receiving channel module 13 to obtain radio frequency signal data;
processing the radio frequency signal data through the multi-channel anti-interference frequency conversion module 14 to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module 15 according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module 16 according to the switching information data to obtain navigation data.
It should be noted that the array antenna module 11 is composed of a plurality of low-orbit signal receiving antennas and GNSS signal receiving antennas, and is used for receiving navigation and navigation enhancement signals transmitted by low-orbit and medium-high orbit satellites. The navigation and navigation enhancement signals here may be understood as transmitted signals. The switching module 12 can detect the received signal and generate corresponding switching information data according to the detection result in a preset manner. The switching module 12 here also comprises two output ports. According to the switching information data, one of the output ports can be selected as a target output port, and the line is switched to the target output port. Here, line switching is understood to mean that a line between the reception signal and the target output port is on and the remaining lines are off. Line switching here is also understood to mean routing a received signal to a target output port. The rf front end receiving channel module 13 may also be understood as an rf front end receiving channel, and may process the received signal through a built-in receiving channel to obtain corresponding rf signal data. The radio frequency signal data herein may be understood as a radio frequency signal. The multi-channel anti-interference frequency conversion module 14 performs single-conversion difference, down-conversion, intermediate frequency amplification, difference conversion and intermediate frequency filtering on the radio frequency signal amplified by the antenna and the radio frequency front end to complete analog down-conversion processing, so as to obtain an analog intermediate frequency signal. The analog intermediate frequency signal is here understood to be analog intermediate frequency signal data. The anti-interference baseband module 15 can be understood as an anti-interference baseband, and switches to a preset processing mode in advance according to the switching information data, performs analog-to-digital conversion, digital down conversion, anti-interference processing and digital signal quantization on the received analog intermediate frequency signal to obtain a digital intermediate frequency signal without interference, and sends the digital intermediate frequency signal to the baseband processing module. The digital if signal is understood to be digital if signal data, and the baseband processing module is understood to be the navigation baseband module 16. The navigation baseband module 16 switches to a preset processing mode in advance according to the switching information data, performs capturing, tracking, pseudo-range measurement, carrier phase measurement, doppler measurement, navigation message demodulation and conversion, and signal quality monitoring on the digital intermediate frequency signal without interference, completes receiving measurement, loop state indication, multi-path suppression, and channel delay monitoring of the multi-system navigation signal, despreads and demodulates original observation data, navigation messages, and state parameters, and obtains final navigation data.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
It can be understood that when receiving the transmitted signal composed of the navigation and navigation enhancement signals transmitted by the low-orbit and medium-and high-orbit satellites, the received signal inevitably receives the influence of the external environment, and the received signal includes various interference signals besides the navigation signal and the navigation enhancement signal.
The present application further provides another signal processing method, which is applied to the multi-channel anti-interference apparatus 100, and includes the following steps:
receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite through the N array antenna units to obtain N sub receiving signals;
respectively detecting the N sub-receiving signals through the N power detection switching circuit units to obtain N detection powers;
processing the N detection powers through the switching judgment circuit unit to generate switching information data;
determining N target output ports of the N power detection switching circuit units according to the switching information data, and outputting the N sub-receiving signals through the N target output ports;
respectively processing the N sub-receiving signals through the N receiving channel units to obtain N radio frequency signal data;
processing the N radio frequency signal data by the multi-channel anti-interference frequency conversion module 14 to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module 15 according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module 16 according to the switching information data to obtain navigation data.
It should be noted that the array antenna unit here is composed of a low-orbit signal receiving antenna and a GNSS signal receiving antenna. Referring to fig. 3, the array antenna module 11 is composed of N array antenna units Y1 to Yn, and each array antenna unit can receive a sub-received signal. The switching module 12 is composed of N power detection switching circuit units from the switching judgment circuit unit and the power detection switching circuit 1 to the power detection switching circuit N.
Further, the received signal includes a navigation signal, a navigation enhancement signal and an interference signal.
It can be understood that when receiving the transmitted signal composed of the navigation and navigation enhancement signals transmitted by the low-orbit and medium-and high-orbit satellites, the received signal inevitably receives the influence of the external environment, and the received signal includes various interference signals besides the navigation signal and the navigation enhancement signal.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A multi-channel interference rejection unit, comprising:
the array antenna module is used for receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite to obtain receiving signals;
the switching module is electrically connected with the array antenna module and used for generating switching information data according to the received signals; the switching module is also used for determining a target output port of the switching module according to the switching information data and outputting the received signal through the target output port;
the radio frequency front end receiving channel module is electrically connected with the switching module and is used for processing the received signals to obtain radio frequency signal data;
the multi-channel anti-interference frequency conversion module is electrically connected with the radio frequency front end receiving channel module and is used for processing the radio frequency signal data to obtain analog intermediate frequency signal data;
the anti-interference baseband module is electrically connected with the switching module and the multi-channel anti-interference frequency conversion module and is used for processing the analog intermediate-frequency signal data according to the switching information data to obtain digital intermediate-frequency signal data;
and the navigation baseband module is electrically connected with the switching module and the anti-interference baseband module and is used for processing the digital intermediate frequency signal data according to the switching information data to obtain navigation data.
2. The apparatus of claim 1, wherein the received signals comprise navigation signals, navigation enhancement signals, and interference signals.
3. The apparatus according to claim 1, wherein the array antenna module includes N array antenna units, the received signal includes N sub-received signals respectively received by the N array antenna units, the switching module includes a switching judgment circuit unit and N power detection switching circuit units, and the rf front end receive channel module includes N receive channel units;
the switching judgment circuit unit is electrically connected with the N power detection switching circuit units, the anti-interference baseband module and the navigation baseband module;
the Nth power detection switching circuit unit is electrically connected with the Nth array antenna unit and the Nth receiving channel unit;
the N power detection switching circuit units are used for respectively detecting the N sub-receiving signals to obtain N detection powers;
the switching judgment circuit unit is used for generating switching information data according to the N detection powers;
the N power detection switching circuit units are used for uniformly determining N target output ports of the N power detection switching circuit units according to the switching information data and outputting the N sub-receiving signals through the N target output ports;
the N receiving channel units are used for respectively processing the N sub-receiving signals to obtain N radio frequency signal data;
wherein N is a positive integer.
4. The apparatus of claim 3, wherein the power detection switching circuit unit comprises a power detection circuit and a radio frequency switch;
the power detection circuit is used for detecting the power of the sub-received signals to obtain detection power;
the radio frequency switch is used for determining a target output port of the power detection switching circuit unit according to the switching information data and outputting the sub-receiving signal through the target output port.
5. The apparatus of claim 4, wherein the radio frequency switch comprises a first input, a second input, a first output, a second output;
the receiving channel unit comprises a first receiving channel and a second receiving channel;
the first output end is electrically connected with the first receiving channel, and the second output end is electrically connected with the second receiving channel;
the first input terminal is configured to receive the sub-received signal, and the second input terminal is configured to receive the switching information data;
and the radio frequency switch switches the connection relation among the first input end, the first output end and the second output end according to the switching information data, and determines a target output port from the first output end and the second output end.
6. The apparatus of claim 5, wherein the multi-channel anti-jamming frequency conversion module comprises a first multi-channel anti-jamming frequency conversion unit and a second multi-channel anti-jamming frequency conversion unit;
the first multi-channel anti-interference frequency conversion unit is electrically connected with the first receiving channel, and the second multi-channel anti-interference frequency conversion unit is electrically connected with the second receiving channel;
the first multi-channel anti-interference frequency conversion unit and the second multi-channel anti-interference frequency conversion unit are respectively electrically connected with the anti-interference baseband module.
7. A signal processing method applied to the multi-channel interference rejection apparatus according to claim 1, comprising the steps of:
receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite through the array antenna module to obtain receiving signals;
generating switching information data through the switching module according to the receiving signal;
determining a target output port of the switching module according to the switching information data, and outputting the received signal through the target output port;
processing the received signal through the radio frequency front end receiving channel module to obtain radio frequency signal data;
processing the radio frequency signal data through the multi-channel anti-interference frequency conversion module to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module according to the switching information data to obtain navigation data.
8. The method of claim 7, wherein the received signals comprise navigation signals, navigation enhancement signals, and interference signals.
9. A signal processing method applied to the multi-channel interference rejection unit according to claim 3, comprising the steps of:
receiving the transmitting signals of the low-orbit satellite and the middle-high orbit satellite through the N array antenna units to obtain N sub-receiving signals;
respectively detecting the N sub-receiving signals through the N power detection switching circuit units to obtain N detection powers;
processing the N detection powers through the switching judgment circuit unit to generate switching information data;
determining N target output ports of the N power detection switching circuit units according to the switching information data, and outputting the N sub-receiving signals through the N target output ports;
processing the N sub-receiving signals through the N receiving channel units respectively to obtain N radio frequency signal data;
processing the N radio frequency signal data through the multi-channel anti-interference frequency conversion module to obtain analog intermediate frequency signal data;
processing the analog intermediate frequency signal data through the anti-interference baseband module according to the switching information data to obtain digital intermediate frequency signal data;
and processing the digital intermediate frequency signal data through the navigation baseband module according to the switching information data to obtain navigation data.
10. The method of claim 9, wherein the received signals comprise navigation signals, navigation enhancement signals, and interference signals.
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