Frequency hopping satellite communication tracking interference signal generating device based on TOD

Abstract

The invention relates to a frequency hopping satellite communication tracking interference signal generating device based on time of day (TOD), and belongs to the field of satellite communication confrontation. The invention provides a frequency hopping satellite communication tracking interference signal generation device based on TOD (Time of Delay), aiming at the verification requirement of a frequency hopping satellite communication anti-tracking interference test and solving the problems of high hardware requirement, complex software processing, high cost and the like in a traditional tracking interference signal'full bandwidth sampling-detection-interference generation 'processing architecture. The carrier frequency and the bandwidth information of the frequency hopping signal are calculated in real time according to the TOD information, the interference time and the interference pattern can be flexibly set, the method has the advantages of being simple in processing and flexible in interference, and the cost is greatly reduced compared with a traditional scheme. The method is suitable for generating and processing tracking interference signals of various frequency-hopping communication systems, and can be applied to the fields of anti-interference capability testing of frequency-hopping communication equipment, construction of a red-blue confrontation environment of the frequency-hopping communication system and the like.

Description

Technical Field

[0001] The invention relates to a device for generating a frequency hopping satellite communication tracking interference signal based on TOD (Time of Day) and belongs to the field of satellite communication countermeasures. Background Art

[0002] Frequency-hopping satellite communications have outstanding features such as anti-interference, anti-interception, and anti-detection, and are the preferred system for satellite communications with security protection needs. Due to the inherent characteristics of satellite communications such as relatively fixed satellite positions and open communication channels, satellite communications are susceptible to interference threats. Therefore, when designing the technical system and developing equipment for frequency-hopping satellite communications, it is necessary to conduct anti-interference design and carry out anti-interference index testing and capability assessment. Tracking interference belongs to the range of smart interference and poses a greater threat to frequency-hopping satellite communications. When conducting anti-interference capability tests, the focus should be on verifying the anti-tracking interference capability. When constructing the test environment, it is required to have the ability to generate tracking interference signals, and the tracking interference signals are required to flexibly and accurately simulate various interference methods that may occur in actual use.

[0003] At present, the common tracking interference signal generation is mostly implemented by the "full bandwidth sampling-detection-interference generation" processing architecture, including two parts: receiving and transmitting. After receiving and detecting the frequency hopping frequency of the communication signal, the interference signal is regenerated at the same frequency. A simpler processing method is to only amplify the received signal and then forward it. This type of processing method has the following problems: First, because the reconnaissance party does not understand the frequency hopping pattern rules, it can only design the receiving end signal processing bandwidth to cover the frequency hopping bandwidth. When the frequency hopping bandwidth reaches more than GHz, the hardware requirements for large bandwidth signal reception and real-time processing are high and the implementation cost is high; secondly, due to the multiple chaotic anti-reconnaissance measures of frequency hopping communication itself, it is difficult for the reconnaissance party to detect the reconnaissance signal. In actual communication countermeasures, the signal feature recognition function is usually completed by a separately arranged reconnaissance system (complex system and high cost), thereby guiding the implementation of tracking interference. In the construction of the test and joint test environment in the research and development process, it is necessary to realize the application of smart tracking interference for different types of communication signals. If conventional ideas are adopted, the construction cost will be high. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of high cost and inflexible interference mode in the traditional tracking interference generating device based on the "full bandwidth sampling-detection-interference generation" processing architecture. With the broadband high-speed frequency hopping satellite communication technology system as the background and the goal of solving the anti-tracking interference capability verification needs in the design of the frequency hopping satellite communication technology system and the development of related equipment, a frequency hopping satellite communication tracking interference signal generating device based on TOD is proposed according to the characteristics of TOD signals in the frequency hopping satellite communication system and the test verification needs. On the basis of conventional frequency hopping communication equipment, through software transformation, at a relatively low cost, the fine control of the tracking interference signal type, frequency, time, power and aiming object is achieved, which supports the construction of the frequency hopping satellite communication R&D test environment, is also suitable for the construction of the satellite communication red-blue confrontation environment, and supports the comprehensive and in-depth verification of the system's anti-tracking interference capability.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A frequency hopping satellite communication tracking interference signal generating device based on TOD, comprising a frequency hopping receiving unit, a frequency hopping transmitting unit, a monitoring unit, a frequency hopping pattern analyzing unit, an interference frequency calculating unit, an interference delay control unit, an interference switch control unit, a frequency hopping modulation local oscillator source unit, an interference signal generating unit, a DA conversion unit, an intermediate frequency modulation unit, a filtering and level adjusting unit and a switch unit;

[0007] The frequency hopping receiving unit is used to receive the satellite downlink frequency hopping communication signal, obtain the downlink TOD information, recorded as TOD1, and obtain the satellite-to-ground transmission delay RTT error value sent by the satellite, recorded as RTT delta ; TOD1 and RTT delta Send to the frequency hopping sending unit;

[0008] The frequency hopping transmission unit is used to transmit the satellite-to-ground transmission delay RTT and the satellite-to-ground transmission delay RTT error value RTT. delta Add TOD1 to obtain the TOD information corresponding to the uplink frequency hopping communication signal, recorded as TOD2, send TOD2 to the frequency hopping pattern analysis unit and the monitoring unit respectively, and generate a satellite uplink frequency hopping communication signal for transmission;

[0009] The monitoring unit is used to analyze and obtain the carrier bandwidth f of the frequency hopping communication signal to be interfered at the corresponding time in real time according to the received TOD2 information. width and carrier type f type ; and generate interference type and parameters, interference frequency offset f according to the configuration i , interference delay t delay , interference power and interference switch; the carrier bandwidth f widthand interference type and parameters are sent to the interference signal generation unit; the interference offset frequency f i Send to the interference frequency calculation unit; delay the interference t delay Send to the interference delay control unit; send the interference power to the filtering and level adjustment unit; the interference switch and carrier type f type Send to the interference switch control unit;

[0010] The frequency hopping pattern analysis unit is used to calculate the carrier frequency f of the frequency hopping communication signal at the corresponding time in real time according to TOD2. c_up , and sent to the interference frequency calculation unit;

[0011] The interference frequency calculation unit is used to convert the communication signal frequency f c_up and the interference frequency offset f i Add them together to calculate the actual transmission frequency value of the interference signal, and the result is recorded as f i_up , f i_up After being converted into a frequency control word, it is sent to the interference delay control unit;

[0012] The interference delay control unit is used to delay , for f i_up The frequency control word delay t delay Then sent to the frequency hopping modulation local oscillator source unit, where t delay The range is 0 to 1 hop dwell time;

[0013] The frequency hopping modulation local oscillator source unit is used to realize the generation of the frequency hopping local oscillator signal for tracking interference according to the delayed frequency control word, and send the frequency hopping local oscillator signal to the intermediate frequency modulation unit;

[0014] The interference switch control unit is used to generate a switch control signal for the interference signal according to the interference switch and carrier type configured by the monitoring unit, and send the signal to the switch unit;

[0015] The interference signal generating unit is used to generate the interference signal according to the carrier bandwidth f configured by the monitoring unit. width , interference type and parameters to generate a digital interference signal, and send the digital interference signal to a DA conversion unit;

[0016] The DA conversion unit is used to complete the digital-to-analog conversion process of the digital interference signal to the analog interference signal, and send the analog interference signal to the intermediate frequency modulation unit;

[0017] The intermediate frequency modulation unit is used to convert the analog interference signal into an intermediate frequency interference signal by using the frequency hopping local oscillator signal, and send it to the filtering and level adjustment unit;

[0018] The filtering and level adjustment unit is used to filter the intermediate frequency interference signal, and adjust the level of the intermediate frequency interference signal according to the interference power control parameter, and send the filtered and level-adjusted intermediate frequency interference signal to the switch unit;

[0019] The switch unit is used to complete the switch control of the intermediate frequency interference signal according to the switch control signal, and output the frequency hopping tracking interference signal.

[0020] Furthermore, the interference types in the interference signal generating unit include single-tone interference, multi-tone interference and partial-band white noise interference; the multi-tone interference parameters include the number of multi-tones and the multi-tone interval; the partial-band white noise interference parameters include the interference bandwidth, wherein the interference bandwidth is set to the communication signal carrier bandwidth f width A certain proportion, the proportional coefficient is selected from 1% to 150%.

[0021] Furthermore, the monitoring unit generates an interference offset frequency f according to the configuration. i The range is 0Hz to positive load wave bandwidth f width .

[0022] Furthermore, the switch control signal s generated in the interference switch control unit includes four states, s1 is always "on", s2 is only aimed at the signaling carrier "on", s3 is only aimed at the service carrier "on" and s4 is closed.

[0023] The advantages of the present invention are:

[0024] 1. Flexible interference and high fidelity

[0025] The interference signal type, frequency offset, transmission delay, power, switch and other parameters of the device proposed in the present invention can be flexibly configured; based on the communication signal characteristics obtained by TOD, the tracking interference signal characteristics of actual satellite communication countermeasure equipment can be realistically simulated. For example, by controlling the transmission delay, the spatial distance between the actual interfering station and the interfered communication station can be equivalently simulated.

[0026] 2. High scalability and good applicability

[0027] The tracking interference signal generation method of the device proposed in the present invention is decoupled from the frequency hopping communication parameters such as frequency hopping bandwidth, frequency hopping rate, modulation, and coding, and can be extended to broadband high-speed frequency hopping technical systems with different technical parameter combinations. It is suitable for frequency hopping communication test applications in different RF bands and has good applicability.

[0028] 3. Low cost and good economy

[0029] Compared with the frequency hopping communication transceiver channel equipment developed and produced in batches, the device proposed by the present invention does not require additional hardware, occupies only a small amount of FPGA processing resources, and can support the generation and processing of tracking interference signals with a frequency hopping bandwidth of 2GHz, a frequency hopping rate of 20,000 hops / second, and a larger bandwidth and higher hopping rate. The cost of the device proposed by the present invention is expected to be less than 500,000 yuan. Compared with the cost of nearly 10 million yuan of the conventional "full bandwidth sampling-detection-interference generation" method guided by the detection and reception system, the cost of the device proposed by the present invention is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of an application scenario of the present invention.

[0031] Figure 2 It is a schematic diagram of the functional composition of the tracking interference signal generating device of the present invention. DETAILED DESCRIPTION

[0032] The following is combined with Figures 1-2 It should be noted that in the following description, when the detailed description of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0033] The TOD-based frequency hopping satellite communication tracking interference signal generating device of the present invention supports on-board processing and forwarding of communication satellites, including and applicable to uplinks from user stations to communication satellites and downlinks from communication satellites to user stations;

[0034] Both the uplink and downlink adopt a broadband high-speed frequency hopping technology system. The main feature is that the uplink and downlink carrier frequencies hop at a certain hopping rate within a certain hopping bandwidth with TOD. To facilitate quantitative analysis, the communication-related parameters are assumed to be as follows: both the uplink and downlink use a hopping bandwidth of 2 GHz, a hopping rate of 20,000 hops / second, a signaling signal carrier bandwidth of 256 ksps, and a service signal carrier bandwidth of 2.56 Msps. The specific implementation methods are given as follows.

[0035] Figure 1 The figure shows a schematic diagram of the application scenario of the present invention, where the interference station applies a tracking interference signal to the uplink of the user station. The communication signal hops at high speed approximately randomly within the GHz bandwidth, and the interference signal needs to track and aim at the communication signal hop by hop. By applying tracking interference signals with different parameter combinations, the interference of the test communication is observed, and the technical system design of the communication system and the performance of related equipment are evaluated to see whether they meet expectations, so as to support the identification of the shortcomings of the system's anti-interference ability and optimize the related design. Figure 1 The figure shows a wireless test environment. The device proposed by the present invention is also suitable for a wired test environment using intermediate frequency or radio frequency during indoor plane joint testing.

[0036] exist Figure 1In the application scenario shown, the frequency hopping tracking interference signal parameters are set as follows: the interference signal style selects partial frequency band interference, the interference signal bandwidth is selected to be equal to the communication signal bandwidth, the interference signal frequency targets the communication signal carrier center frequency, the interference delay selects 1 / 2 hop dwell time (25 microseconds), the interference power is -5dBm, and the interference object selects only the interference signaling signal. The frequency hopping satellite communication tracking interference signal generating device based on TOD of the present invention is as follows. Figure 2 As shown, the specific implementation is given as follows:

[0037] A frequency hopping satellite communication tracking interference signal generating device based on TOD, comprising a frequency hopping receiving unit, a frequency hopping transmitting unit, a monitoring unit, a frequency hopping pattern analyzing unit, an interference frequency calculating unit, an interference delay control unit, an interference switch control unit, a frequency hopping modulation local oscillator source unit, an interference signal generating unit, a DA conversion unit, an intermediate frequency modulation unit, a filtering and level adjusting unit and a switch unit;

[0038] The frequency hopping receiving unit is used to complete the reception and processing of the normal satellite downlink frequency hopping communication signal, obtain the downlink TOD (Time of Day, real-time time) information, recorded as TOD1; and obtain the satellite-to-ground transmission delay RTT (Round-Trip Time) error value sent by the satellite, recorded as RTT delta ; TOD1 and RTT delta Send frequency hopping sending unit;

[0039] The frequency hopping transmission unit is used to convert the satellite-to-ground transmission delay RTT and the satellite-to-ground transmission delay error RTT delta Add TOD1 to obtain the TOD information corresponding to the uplink frequency hopping communication signal, recorded as TOD2, and send TOD2 to the frequency hopping pattern analysis unit and the monitoring unit respectively, and generate a satellite uplink frequency hopping communication signal for transmission;

[0040] The monitoring unit is used to analyze and obtain the carrier bandwidth f of the frequency hopping communication signal to be interfered at the corresponding time in real time according to the received TOD2 information. width and carrier type f type ; and generate interference type and parameters, interference frequency offset f according to the operator configuration i , interference delay t delay , interference power and interference switch; the carrier bandwidth f width , interference type and parameters are sent to the interference signal generation unit; the interference offset frequency f i Send to the interference frequency calculation unit; delay the interference t delay Send it to the interference delay control unit; send the interference power to the filtering and level adjustment unit; send the interference switch and carrier type f type are sent to the interference switch control unit; among which, the carrier type ftype Including signaling carrier and service carrier; the carrier bandwidth f of the signaling carrier width The carrier bandwidth f is 256ksps and the service carrier width 2.56Msps;

[0041] The frequency hopping pattern analysis unit is used to calculate the carrier frequency f of the frequency hopping communication signal at the corresponding time in real time according to TOD2. c_up , and sent to the interference frequency calculation unit;

[0042] The interference frequency calculation unit is used to convert the communication signal frequency f c_up and the interference frequency offset f i Add them together to calculate the actual transmission frequency value of the interference signal, and the result is recorded as f i_up , f i_up After being converted into a frequency control word, it is sent to the interference delay control unit;

[0043] The interference delay control unit is used to delay , for f i_up The frequency control word delay t delay Then sent to the frequency hopping modulation local oscillator source unit, where t delay The range is 0 to 1 hop dwell time; t delay Here it is configured as 25us, at which point the interference signal covers 1 / 2 hop communication signal;

[0044] The frequency hopping modulation local oscillator source unit is used to realize the generation of tracking interference frequency hopping local oscillator signal according to the delayed frequency control word, and send the frequency hopping local oscillator signal to the intermediate frequency modulation unit;

[0045] The interference switch control unit is used to generate a switch control signal for the interference signal according to the interference switch and carrier type configured by the monitoring unit, and send the signal to the switch unit;

[0046] The interference signal generating unit is used to generate the interference signal according to the carrier bandwidth f configured by the monitoring unit. width , interference type and parameters to generate a digital interference signal, and send the digital interference signal to the DA conversion unit;

[0047] The DA conversion unit is used to complete the digital-to-analog conversion process of the digital interference signal to the analog interference signal, and send the analog interference signal to the intermediate frequency modulation unit;

[0048] The intermediate frequency modulation unit is used to convert the analog interference signal into an intermediate frequency interference signal by using the frequency hopping local oscillator signal, and send it to the filtering and level adjustment unit;

[0049] The filtering and level adjustment unit is used to filter the intermediate frequency interference signal, and complete the level adjustment of the intermediate frequency interference signal according to the interference power control parameter, and send the filtered and level-adjusted intermediate frequency interference signal to the switch unit; here the interference signal power is configured to -5dBm;

[0050] The switch unit completes the switch control of the interference signal according to the switch control signal, and outputs the frequency hopping tracking interference signal.

[0051] The interference types in the interference signal generating unit generally include single-tone interference, multi-tone interference, and partial-band white noise interference; the multi-tone interference parameters include the number of multi-tones and the multi-tone interval; the partial-band white noise interference parameters include the interference bandwidth, where the interference bandwidth can be set to the communication signal carrier bandwidth f width The ratio coefficient can generally be selected from 1% to 150%; forming an on-demand coverage of the frequency hopping communication signal by the frequency hopping tracking interference signal; here the interference type is configured as partial band white noise interference, and the interference bandwidth is configured to be equal to the communication signaling signal carrier bandwidth f width , which is 256ksps.

[0052] The monitoring unit generates the interference offset frequency f according to the operator configuration. i The range supports 0Hz to positive load wave bandwidth f width , forming the interference effect of the frequency hopping tracking interference signal leading, lagging or aligning with the frequency hopping communication signal in the frequency domain; here the interference offset frequency f i Configure it to 0Hz, which means aligning it with the frequency center of the interfered signal.

[0053] Among them, the switch control signal s generated in the interference switch control unit includes four states, s1 is always "on", s2 only targets the signaling carrier "on", s3 only targets the service carrier "on" and s4 is closed; forming a smart interference to the signaling carrier or the service carrier; here the switch control signal is configured as s2 only targets the signaling carrier "on".

[0054] In the embodiment, an example of implementing a certain style of tracking interference on the communication signaling signal in the uplink is selected for illustration, which intuitively demonstrates the flexibility of the method in tracking the generation of interference signals, and the flexible combination capability of interference type, frequency shift, delay, power and other parameters formed around the key communication parameters obtained based on TOD, indicating that the technical features of actual communication anti-interference equipment can be realistically simulated.

[0055] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any equivalent replacement or change made by a person skilled in the art based on the technical solution and inventive concept of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for generating tracking interference signals for frequency hopping satellite communication based on TOD, characterized in that: It includes a frequency hopping receiving unit, a frequency hopping transmitting unit, a monitoring unit, a frequency hopping pattern analyzing unit, an interference frequency calculating unit, an interference delay control unit, an interference switch control unit, a frequency hopping modulation local oscillator source unit, an interference signal generating unit, a DA conversion unit, an intermediate frequency modulation unit, a filtering and level adjusting unit and a switch unit; The frequency hopping receiving unit is used to receive the satellite downlink frequency hopping communication signal, obtain the downlink TOD information, recorded as TOD1, and obtain the satellite-to-ground transmission delay RTT error value sent by the satellite, recorded as RTT delta ; TOD1 and RTT delta Send to the frequency hopping sending unit; The frequency hopping transmission unit is used to transmit the satellite-to-ground transmission delay RTT and the satellite-to-ground transmission delay RTT error value RTT. delta Add TOD1 to obtain the TOD information corresponding to the uplink frequency hopping communication signal, recorded as TOD2, send TOD2 to the frequency hopping pattern analysis unit and the monitoring unit respectively, and generate a satellite uplink frequency hopping communication signal for transmission; The monitoring unit is used to analyze and obtain the carrier bandwidth f of the frequency hopping communication signal to be interfered at the corresponding time in real time according to the received TOD2 information. width and carrier type f type ; and generate interference type and parameters, interference frequency offset f according to the configuration i , interference delay t delay , interference power and interference switch; the carrier bandwidth f width and interference type and parameters are sent to the interference signal generation unit; the interference offset frequency f i Send to the interference frequency calculation unit; delay the interference t delay Send to the interference delay control unit; send the interference power to the filtering and level adjustment unit; the interference switch and carrier type f type Send to the interference switch control unit; The frequency hopping pattern analysis unit is used to calculate the carrier frequency f of the frequency hopping communication signal at the corresponding time in real time according to TOD2. c_up , and sent to the interference frequency calculation unit; The interference frequency calculation unit is used to convert the communication signal frequency f c_up and the interference frequency offset f i Add them together to calculate the actual transmission frequency value of the interference signal, and the result is recorded as f i_up , f i_up After being converted into a frequency control word, it is sent to the interference delay control unit; The interference delay control unit is used to delay , for f i_up The frequency control word delay t delay Then sent to the frequency hopping modulation local oscillator source unit, where t delay The range is 0 to 1 hop dwell time; The frequency hopping modulation local oscillator source unit is used to realize the generation of the frequency hopping local oscillator signal for tracking interference according to the delayed frequency control word, and send the frequency hopping local oscillator signal to the intermediate frequency modulation unit; The interference switch control unit is used to generate a switch control signal for the interference signal according to the interference switch and carrier type configured by the monitoring unit, and send the signal to the switch unit; The interference signal generating unit is used to generate the interference signal according to the carrier bandwidth f configured by the monitoring unit. width , interference type and parameters to generate a digital interference signal, and send the digital interference signal to a DA conversion unit; The DA conversion unit is used to complete the digital-to-analog conversion process of the digital interference signal to the analog interference signal, and send the analog interference signal to the intermediate frequency modulation unit; The intermediate frequency modulation unit is used to convert the analog interference signal into an intermediate frequency interference signal by using the frequency hopping local oscillator signal, and send it to the filtering and level adjustment unit; The filtering and level adjustment unit is used to filter the intermediate frequency interference signal, and adjust the level of the intermediate frequency interference signal according to the interference power control parameter, and send the filtered and level-adjusted intermediate frequency interference signal to the switch unit; The switch unit is used to complete the switch control of the intermediate frequency interference signal according to the switch control signal, and output the frequency hopping tracking interference signal.

2. The device for generating a frequency hopping satellite communication tracking interference signal based on TOD according to claim 1, characterized in that: The interference types in the interference signal generation unit include single-tone interference, multi-tone interference and partial-band white noise interference; the multi-tone interference parameters include the number of multi-tones and the multi-tone interval; the partial-band white noise interference parameters include the interference bandwidth, where the interference bandwidth is set to the communication signal carrier bandwidth f width A certain proportion, the proportional coefficient is selected from 1% to 150%.

3. The device for generating a frequency hopping satellite communication tracking interference signal based on TOD according to claim 1, characterized in that: The monitoring unit generates interference offset frequency f according to the configuration i The range is 0Hz to positive load wave bandwidth f width .

4. The device for generating a frequency hopping satellite communication tracking interference signal based on TOD according to claim 1, characterized in that: The switch control signal s generated in the interference switch control unit includes four states, s1 is always "on", s2 is only aimed at the signaling carrier "on", s3 is only aimed at the service carrier "on" and s4 is closed.

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