CN104125025B - Spaceborne ADS-B detects receipts signal simulator - Google Patents

Abstract

The invention discloses a kind of spaceborne ADS B and detect receipts signal simulator, detect receipts analogue signal for produce spaceborne ADS B interception system.This spaceborne ADS B detects receipts signal simulator and includes: frequency synthesizer, for output frequency source；Manipulator, is connected with described frequency synthesizer, for being modulated described frequency source based on ADS B base-band data signal, obtains modulated signal；And power amplifier, it is connected with described manipulator, for being amplified described modulated signal, the modulated signal after amplifying detects receipts analog signal output as described.By the present invention, solve the problem that prior art cannot simulate the working environment of spaceborne ADS B interception system, reach the effect of the working environment simulating spaceborne ADS B interception system.

Description

Spaceborne ADS-B reconnaissance signal simulator

technical field

The invention relates to the field of signal simulation, in particular to a spaceborne ADS-B reconnaissance signal simulator.

Background technique

Automatic Dependent Surveillance-Broadcast (ADS-B) uses omnidirectional broadcasting to broadcast air-to-air and air-to-ground reports, and the aircraft automatically transmits its own position to surrounding aircraft, vehicles, and ground receiving devices, etc. Information, in addition to realizing air-to-air mutual surveillance and air-to-ground surveillance, can also realize other various functions: air planes can automatically identify mutual positions, keep distance, and avoid collisions; ground navigation and command systems can use ADS-B to use Terminals and aerial vehicles implement navigation, surveillance and command; thus, aircraft, aircraft on the ground of the airport, and vehicles on the ground of the airport maintain a certain safe distance, which plays the role of surveillance and collision avoidance.

The biggest difference between the spaceborne ADS-B reconnaissance system and the ground ADS-B reconnaissance system is that the spaceborne ADS-B reconnaissance system has a wide coverage and simultaneously detects the signals of multiple targets. For a LEO satellite with an orbital altitude of 600km, the ground coverage reaches 12 million square kilometers (a circle with a diameter of more than 4000km). The number of aircraft targets covered in such a large coverage area is large, and multi-signal conflicts will inevitably occur, resulting in a sharp drop in the signal detection probability of the spaceborne ADS-B, or even complete blockage. In addition to signal conflicts, spaceborne ADS-B also has the characteristics of large differences in multi-signal power (different transmission distances lead to different spatial attenuation), and large Doppler frequency shifts.

The inventors found that when the spaceborne ADS-B detection and reception system was developed on the ground, because there was no analog signal source of the spaceborne ADS-B detection and reception system, the working environment of the spaceborne ADS-B detection and reception system could not be simulated, thus It is impossible to test the performance of the spaceborne ADS-B reconnaissance system.

Aiming at the problem that the existing technology cannot simulate the working environment of the spaceborne ADS-B reconnaissance system, no effective solution has been proposed yet.

Contents of the invention

The main purpose of the present invention is to provide a spaceborne ADS-B detection signal simulator to solve the problem that the working environment of the spaceborne ADS-B detection system cannot be simulated.

In order to achieve the above object, the present invention provides a spaceborne ADS-B detection signal simulator, which is used to generate the detection simulation signal of the spaceborne ADS-B detection system. The satellite-borne ADS-B reconnaissance signal emulator according to the present invention includes: a frequency synthesizer, used for outputting a frequency source; A frequency source is modulated to obtain a modulated signal; and a power amplifier is connected to the modulator for amplifying the modulated signal and outputting the amplified modulated signal as the detection analog signal.

Further, the on-board ADS-B detection signal simulator also includes: a data processor, which is connected to the frequency synthesizer, the modulator and the power amplifier respectively, and the data processor is used for receiving The Doppler shift parameter controls the frequency synthesizer to output the frequency source, which is used to send the ADS-B baseband data signal to the modulator, and is used to control the gain of the power amplifier according to the received power parameter .

Further, the on-board ADS-B detection signal simulator also includes: a computer connected to the data processor for sending control parameters to the data processor, the control parameters include at least one of the following : the quantity of the detected analog signal, the power parameter, the Doppler shift parameter, and the signal transmission period, wherein the data processor controls the frequency synthesizer and the modulation according to the control parameter tors and the power amplifier.

Further, the computer sends the control parameters to the data processor through the RS232 serial port.

Further, the data processor includes a TMS320VC55209DSP chip.

Further, the frequency synthesizer includes multiple frequency synthesizers, and the power amplifier includes multiple power amplifiers, wherein the modulator is used to respectively modulate the frequency sources output by the multiple frequency synthesizers to obtain multiple modulated signals, and output the multiple modulated signals to the multiple power amplifiers respectively, and the satellite-borne ADS-B detection signal simulator also includes: a signal combiner, which is respectively connected with the multiple power amplifiers are connected for synthesizing and outputting a plurality of amplified modulated signals.

Further, the signal combiner outputs the synthesized signal through wired radio frequency or wireless radio frequency.

Further, the modulator includes an ASK modulation chip, and the ASK modulation chip uses the ADS-B baseband data signal as a control signal to perform ASK modulation on the frequency source to obtain the modulated signal.

Further, the frequency synthesizer is a phase-locked loop frequency synthesizer.

Further, the phase-locked loop frequency synthesizer is used to generate an ADS-B frequency source of 1090Mhz+Doppler frequency offset.

According to the present invention, adopting the satellite-borne ADS-B reconnaissance signal emulator includes a frequency synthesizer, a modulator and a power amplifier, the frequency synthesizer outputs a frequency source, and the modulator modulates the frequency source based on the ADS-B baseband data signal to obtain modulation signal, the power amplifier amplifies the modulated signal, and outputs the amplified modulated signal as a reconnaissance analog signal, thereby simulating the reconnaissance signal of the spaceborne ADS-B reconnaissance system, which solves the problem of inability to simulate the spaceborne ADS-B reconnaissance The problem of the working environment of the system has achieved the effect of simulating the working environment of the spaceborne ADS-B reconnaissance system.

Description of drawings

The accompanying drawings constituting a part of this application are used to provide further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the structural representation of the space-borne ADS-B reconnaissance signal emulator according to the embodiment of the present invention;

Fig. 2 is the software functional block diagram of the computer of satellite-borne ADS-B reconnaissance signal emulator; And

Fig. 3 is a schematic structural diagram of a preferred spaceborne ADS-B reconnaissance signal simulator according to an embodiment of the present invention.

detailed description

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "comprising" and "having" in the description and claims of the present invention and the above drawings, as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, including a series of steps or units A process, method, system, product or device is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product or device.

An embodiment of the present invention provides a spaceborne ADS-B reconnaissance signal simulator. It is used to generate the reconnaissance analog signal of the spaceborne ADS-B reconnaissance system to simulate the reconnaissance signal of the spaceborne ADS-B reconnaissance system, thereby simulating the working environment of the spaceborne ADS-B reconnaissance system.

Fig. 1 is a schematic structural diagram of a spaceborne ADS-B reconnaissance signal simulator according to an embodiment of the present invention. As shown in FIG. 1 , the spaceborne ADS-B detection signal simulator includes: a frequency synthesizer 10 , a modulator 20 and a power amplifier 30 .

The frequency synthesizer 10 is used to output a frequency source. The frequency source may be the same frequency source that generates the detection signal received by the spaceborne ADS-B detection system, specifically, the frequency source may be a frequency source generated according to a set Doppler frequency offset parameter. Due to the high speed of the satellite, the signal received by the spaceborne ADS-B reconnaissance system has a Doppler frequency offset problem. The frequency source generated according to the set Doppler frequency offset parameters can ensure the accuracy of the signal.

The modulator 20 is connected with the frequency synthesizer 10 and is used for modulating the frequency source based on the ADS-B baseband data signal to obtain a modulated signal, which may be a radio frequency modulated signal.

The modulator 20 modulates the frequency source generated by the frequency synthesizer 10, specifically, the frequency source may be modulated according to the received ADS-B baseband data signal to obtain a radio frequency modulation signal. The radio frequency modulation signal is then transmitted to the power amplifier 30 for amplification. The ADS-B baseband data signal is modulated as a modulated control signal.

The power amplifier 30 is connected with the modulator 20 and is used to amplify the modulation signal, and output the amplified modulation signal as an analog detection signal. Wherein, the gain value of the power amplifier 30 for amplifying the modulated signal can be adjusted as required, so as to simulate the detection signals with different power levels.

According to an embodiment of the present invention, the emulator using the satellite-borne ADS-B detection signal includes a frequency synthesizer, a modulator and a power amplifier, the frequency synthesizer outputs a frequency source, and the modulator modulates the frequency source based on the ADS-B baseband data signal, The modulated signal is obtained, the power amplifier amplifies the modulated signal, and the amplified modulated signal is output as a reconnaissance analog signal, thereby simulating the reconnaissance signal of the spaceborne ADS-B reconnaissance system, which solves the problem of inability to simulate the spaceborne ADS-B The problem of the working environment of the reconnaissance system has achieved the effect of simulating the working environment of the spaceborne ADS-B reconnaissance system.

Preferably, the frequency synthesizer is a phase locked loop (PLL) frequency synthesizer.

Preferably, the satellite-borne ADS-B detection signal simulator also includes a data processor, which is connected with the frequency synthesizer 10, the modulator 20 and the power amplifier 30 respectively, and the data processor is used to obtain the Doppler frequency deviation parameter according to the received Controlling the output frequency source of the frequency synthesizer is used to send the ADS-B baseband data signal to the modulator, and is used to control the gain of the power amplifier according to the received power parameters.

The data processor can receive preset control parameters, control the frequency synthesizer 10, the modulator 20 and the power amplifier 30 according to the control parameters, specifically, and automatically send the ADS-B baseband data signal to the modulator 20 according to the transmission cycle, according to multiple The Doppler frequency deviation parameter controls the frequency synthesizer to generate a frequency source corresponding to the Doppler frequency deviation parameter, and controls the gain value of the power amplifier 30 according to the power parameter.

Preferably, the on-board ADS-B reconnaissance signal simulator also includes a computer connected to the data processor. The computer is used to send control parameters to the data processor, and the control parameters include at least one of the following: the number of received analog signals, power parameters, Doppler shift parameters, and signal transmission periods, and the data processor controls frequency synthesis according to the control parameters modulators, modulators and power amplifiers. Wherein, the quantity of detecting and receiving analog signals is used to control the quantity of output analog signals, the power parameter is the power parameter in the above, and is used to control the gain of the control power amplifier 30, and the Doppler shift parameter is used to control the generation of the frequency source , the signal transmission cycle is used to control the transmission of ADS-B baseband data signals.

Specifically, utilize a computer, integrate a software on it, be used to set the parameters such as aircraft number, signal power, Doppler frequency deviation, signal transmission period, working mode computer to send these parameters to data processor through RS232 serial port, The data processor makes the parameter analysis, and automatically sends the ADS-B baseband data signal according to the signal transmission period parameter, controls the frequency synthesizer to generate the corresponding frequency source according to the Doppler frequency shift parameter, and controls the gain value of the power amplifier according to the power parameter.

The computer and related software set various parameters that need to generate signals, such as working mode, number of signals, Doppler frequency shift value, signal power value, etc., and send them to the data processor through the serial port, and the data processor controls other components to complete Generation of analog signals; the data processor receives instructions from the computer and analyzes the instructions. According to the instructions, it controls the generation of ADS-B digital signals (also the control signal of the ASK modulator) and controls the phase-locked loop (PLL). Frequency synthesizer, power amplifier chip, complete the generation of each signal.

Fig. 2 is a software functional block diagram of the computer of the satellite-borne ADS-B reconnaissance signal simulator. As shown in Figure 2, the software has two working modes that can be selected by the user, one of which is the signal fixed mode (mode 1), which can be used to generate fixed single, double, triple and four-signal signals with frequency, power and transmission interval , used to simulate fixed no-signal conflict reception, 2-4 signal conflict detection and other scenarios to test the performance of the spaceborne ADS-B detection and reception system; another random mode (mode 2) can set the relevant parameter range , the data processor randomly generates signals according to the range of parameters and ADS-B related standards, which are used to simulate the actual operation scene of the spaceborne ADS-B reconnaissance system. For example, if the number of aircraft is 1000, the power is 0-20dBm, the Doppler frequency deviation is ±40kHz, the signal transmission period is between 20ms-3min, randomly distributed, etc., the data processor will randomly combine these parameters to generate signal parameter instructions.

Further, the computer sends the control parameters to the data processor through the RS232 serial port.

As shown in Figure 3, the data processor includes TMS320VC55209DSP chip. TMS320VC55209DSP chip is used as the control core, the chip has 126KB×16-bit on-chip RAM memory, and has the largest external addressing space of 8MB×16-bit, CPU operating frequency up to 200Mhz, two multiplier units (MAC) 40-bit arithmetic The logic unit (ALU) and a 16-bit arithmetic logic unit adopt an advanced multi-bus structure and have two 20-bit timers, and the functions fully meet the requirements of the present invention. After the data processor receives the instructions from the computer, if it is working mode one, select the signal path according to the number of signals; control the phase-locked loop (PLL) frequency synthesizer to generate the corresponding frequency source according to the frequency; send DA analog voltage control according to the power value Amplifier gain size. If it is in working mode 2, the signal sequence is produced according to the number of aircraft and the transmission period, the power and frequency offset of the signal are randomly distributed, and each signal is sent to the ADS-B baseband according to the sequence, and the frequency source and power gain value are controlled synchronously.

Preferably, the modulator includes an ASK modulation chip, and the ASK modulation chip uses the ADS-B baseband data signal as a control signal to perform ASK modulation on the frequency source to obtain a modulated signal.

Preferably, the frequency synthesizer includes a plurality of frequency synthesizers, and the power amplifier includes a plurality of power amplifiers, wherein the modulator is used to respectively modulate frequency sources output by a plurality of frequency synthesizers to obtain a plurality of modulated signals, and convert a plurality of The modulated signals are respectively output to multiple power amplifiers, and the satellite-borne ADS-B detection signal simulator also includes a signal combiner, which is connected to multiple power amplifiers for synthesizing and outputting multiple amplified modulated signals .

As shown in Figure 3, when there are 4 channels of signal output, the 4 channels of signals are synthesized and output through a 4-in-1 signal combiner. It should be noted that the output signal still includes 4 kinds of signals, which are only output uniformly through the signal combiner.

Preferably, the present invention selects the ADF4351 chip phase-locked loop (PLL) frequency synthesizer of AD Company as the frequency source generator. The chip has an integrated voltage-controlled oscillator (VCO) with a fundamental output frequency range of 2200MHz to 4400MHz and an output frequency range of 35MHz to 4400MHz. The DSP writes the frequency control word through the SPI interface, and outputs the ADS-B frequency (about 1090MHz) in real time.

Preferably, the present invention selects HMC336MS8G as the ASK modulator; selects RFVA0016DS (power amplifier) as the power amplifier.

Preferably, the phase-locked loop frequency synthesizer is used to generate an ADS-B frequency source of 1090Mhz+Doppler frequency offset.

In summary, the embodiments of the present invention can achieve the following effects:

1. Considering the Doppler frequency deviation of the received signal caused by the satellite-borne ADS-B reconnaissance signal simulator due to the high speed of the satellite, the Doppler frequency deviation control range of ±40kHz can be realized through software setting , to ensure the accuracy of the signal.

2. Taking into account the wide coverage of the satellite-borne ADS-B reconnaissance signal simulator and the large number of aircraft, it is possible to simulate 1-1000 aircraft transmitting ADS-B signals in a large-scale airspace covered by satellites Various scenes.

3. The power is adjustable from 0-20dBm, taking into account the influence of the signal strength caused by the different distance between the receiver and the aircraft, and can provide a more realistic signal.

4. Fixed single-signal, double-signal, three-signal, and four-signal transmission intervals, which can simulate fixed non-signal conflict reception, 2-4 signal conflict detection and other scenarios.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. a space-borne ADS-B detection signal emulator, is characterized in that, is used to produce the detection analog signal of space-borne ADS-B detection and reception system, and described space-borne ADS-B detection signal simulator comprises: a frequency synthesizer for outputting a frequency source; A modulator, connected to the frequency synthesizer, used to modulate the frequency source based on the ADS-B baseband data signal to obtain a modulated signal; A power amplifier, connected to the modulator, for amplifying the modulation signal, and outputting the amplified modulation signal as the detection analog signal; and a data processor, connected to the frequency synthesizer, the modulator and the power amplifier respectively, the data processor is used to control the frequency synthesizer to output the frequency source according to the received Doppler shift parameter , used to send the ADS-B baseband data signal to the modulator, and used to control the gain of the power amplifier according to the received power parameter. 2. space-borne ADS-B reconnaissance signal emulator according to claim 1, is characterized in that, described space-borne ADS-B reconnaissance signal emulator also comprises: A computer, connected to the data processor, configured to send control parameters to the data processor, the control parameters include at least one of the following: the number of analog signals detected, the power parameter, the multiple Puller shift parameters, signal emission period, Wherein, the data processor controls the frequency synthesizer, the modulator and the power amplifier according to the control parameters. 3. The satellite-borne ADS-B reconnaissance signal simulator according to claim 2, wherein the computer sends the control parameters to the data processor through the RS232 serial port. 4. The satellite-borne ADS-B reconnaissance signal simulator according to claim 1, wherein said data processor comprises a TMS320VC55209DSP chip. 5. space-borne ADS-B reconnaissance signal emulator according to claim 1, is characterized in that, described frequency synthesizer comprises a plurality of frequency synthesizers, and described power amplifier comprises a plurality of power amplifiers, wherein, described The modulator is used to respectively modulate the frequency sources output by the multiple frequency synthesizers to obtain multiple modulated signals, and output the multiple modulated signals to the multiple power amplifiers respectively, and the on-board ADS-B The Scout Signal Simulator also includes: The signal combiner is connected to the multiple power amplifiers respectively, and is used to combine and output the multiple amplified modulated signals. 6. The satellite-borne ADS-B reconnaissance signal simulator according to claim 5, wherein the signal combiner outputs a synthesized signal through wired radio frequency or wireless radio frequency. 7. space-borne ADS-B reconnaissance signal emulator according to claim 1, is characterized in that, described modulator comprises ASK modulation chip, and described ASK modulation chip is control signal with described ADS-B baseband data signal ASK modulation is performed on the frequency source to obtain the modulated signal. 8. The satellite-borne ADS-B reconnaissance signal simulator according to claim 1, wherein the frequency synthesizer is a phase-locked loop frequency synthesizer. 9. The satellite-borne ADS-B reconnaissance signal simulator according to claim 8, wherein the phase-locked loop frequency synthesizer is used to generate the ADS-B frequency source of 1090Mhz+Doppler frequency offset.