KR20150123372A - Hybrid satellite navigation signal generator - Google Patents

Abstract

The present invention relates to a hybrid navigation satellite signal generator. Particularly, normal navigation satellite signal simulation, disturbance signal generation simulation, and navigation satellite signal simulation including mixed disturbance signal can be carried out in a single device by using an RF signal outputted from a hybrid signal generator which is operated according to a command of a navigation satellite scenario controller. So, it can be provided at low cost. It can reduce costs required for test environment configuration and device purchase. Also, it reduces error generating factors due to the feature of the single device so that it can simulate a simulation environment similar to a real environment with high reliability.

Description

{Hybrid satellite navigation signal generator}

The present invention relates to a satellite navigation signal generator, and more particularly, to a complex satellite navigation signal generator capable of simplifying a configuration by integrating a scenario controller and a complex signal generator so that the production cost is low and can be supplied at low cost.

More particularly, the present invention relates to a scenario controller and a composite signal generator integrated with each other, wherein the composite signal generator includes a navigation signal generating module, a jamming signal generating module, and a deception signal generating module, A composite satellite navigation signal generator for combining satellite navigation signal with a synthesized module and transmitting it to a satellite navigation receiver so that a navigation signal simulation function, a disturbance signal simulation function, and a disturbance signal mixed satellite navigation signal simulation can be performed in one device .

The Global Navigation Satellite System (GNSS) is a system for calculating the position, elevation, and velocity of moving objects throughout the Earth using radio waves originating from satellites orbiting the Earth. It is currently used for military purposes such as missile guidance It is widely used in surveillance devices such as surveying, aircraft, ships, and automobiles. The United States has its own GPS (Global Positioning System), Russia's GLONASS (Russia's Global Navigation Satellite System), European Union's Galileo and China's COMPASS (Beidou-2) The positioning system is GPS and GLONASS.

In addition, the US-led GPS system is preparing to send signals such as L2C and L5 in addition to the L1 C / A codes allocated for civil use in accordance with the modernization plan. In order to develop and evaluate a navigation receiver that receives various types of satellite navigation signals, a corresponding navigation signal generator is required. In recent years, a problem of satellite navigation signal disturbance has been highlighted, Researches are being actively conducted.

A satellite navigation disturbance signal refers to an act of jamming the use of a specific frequency or radio wave by emitting a very high frequency energy to a satellite navigation signal use band or transmitting spoofing type radio waves by transmitting false information. Jamming is the act of sending various types of signals, such as tone jamming, narrow band jamming, broadband jamming, pulse jamming, and sweep jamming, with a greater signal strength than the satellite navigation signal, making normal navigation services impossible. ) Is an action that generates an error in the calculation information (position and time information) of the navigation receiver by generating a simulated navigation signal of the same form as that of the satellite navigation signal, which can not be detected by the commercial navigation receiver. .

In order to minimize the effect of the disturbance signal, the satellite navigation system has to increase the resistance against the radio disturbance. Therefore, there is a need for a signal generator capable of generating various types of signals in order to simulate the radio disturbance effect.

There are a variety of techniques related to this, but there are Patent Documents 1 and 2 as an example.

Patent Document 1 discloses a disturbance signal simulator controller that generates position information of a satellite navigation receiver and position information of a disturbance signal generator in real time; A satellite navigation signal simulator for inputting position information of a satellite navigation receiver generated from a disturbance signal simulator controller and generating a satellite navigation signal according to position information of the satellite navigation receiver; A disturbance signal generation controller for calculating a frequency change, an attenuation rate and a phase delay using the position information of the satellite navigation receiver and the disturbance signal generator generated from the satellite navigation disturbance signal simulator controller; A signal generator for generating a disturbance signal using a change in frequency and an attenuation rate and a phase delay calculated from the disturbance signal generation controller; A signal combiner for combining the satellite navigation signal transmitted from the satellite navigation signal simulator and the disturbance signal transmitted from the signal generator to generate a satellite navigation signal including the disturbance signal; And a satellite navigation receiver for receiving a satellite navigation signal including a disturbance signal generated from the signal combiner,

Patent Document 2 discloses a wireless communication system in which a first antenna and a second antenna that are spaced apart from each other by a predetermined distance and installed to be rotatable with respect to a center of a separation distance, An RF signal processing section for outputting an RF signal, an RF signal processing section for outputting an RF signal, a GPS signal processing section for processing the combined signal to generate measurement data and navigation data, and a controller for detecting a tamper signal based on at least one of the measurement data and the navigation data, And an antenna controller for rotating the first and second antennas in response to the provided antenna control command signal.

Such conventional techniques can not only simulate a malfunction signal or a jamming signal but also effectively remove a malfunction signal or a jamming signal.

However, as shown in FIG. 6, the satellite navigation disturbance signal simulator controller of the related art generates a test scenario by linking the satellite navigation signal simulator 400 and the disturbance signal generation controller 200, And then transmits the simulated signal to the satellite navigation receiver 600 through the signal combiner 500. It is very expensive and the interfaces are different from each other, High technical difficulty is required. In addition, additional peripherals are required for interworking between devices, which complicates the configuration and has the disadvantage that it is impossible to simulate a deception signal.

1. Korean Patent No. 1227913 2. Korean Patent Publication No. 10-2013-0135739

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite satellite navigation signal generator capable of simplifying a configuration by integrating a satellite navigation scenario controller and a complex signal generator, The purpose is to provide.

According to an aspect of the present invention, there is provided a composite satellite navigation signal generator comprising: a satellite navigation scenario controller that allows a user to easily set up a navigation signal, a jamming signal, and a jamming signal according to a purpose of use; A composite signal generator for generating a navigation signal, a jamming signal and a jamming signal according to the navigation signal, and transmitting the generated navigation signal, the jamming signal and the jamming signal to a satellite navigation receiver, wherein the composite signal generator communicates with the satellite navigation scenario controller, / Internal control module; A navigation signal generation module for generating a plurality of navigation signals; A deception signal generating module for generating a deception signal for the GPS receiver; A jamming signal generation module for generating a jamming signal that disables the satellite navigation receiver; An RF signal conversion module for converting a frequency to a band used by a satellite navigation receiver; An output signal selection module for independently outputting the navigation signal, the tamper signal and the jamming signal; And an RF signal combining module that combines the RF output signals and transmits the combined RF output signals to the satellite navigation receiver.

The navigation signal generating module may be composed of a navigation satellite orbit generating unit, a navigation message generating unit, an error information processing unit, an IF signal generating unit, and a control unit.

The jamming signal generation module generates a signal in which at least one of the navigation satellite orbit, the navigation signal, the signal intensity, and the Doppler frequency is changed, and the jamming signal generation module 24 is composed of a DDS (Direct Digital Synthesizer) -tone, Multi-tone, FSK, PSK, ASK and Linear sweep signals.

The RF signal conversion module includes a first carrier generator, a first frequency synthesizer, and a first band selection filter for converting the inputted first intermediate frequency signal into a second intermediate frequency signal; And a second carrier generator, a second frequency synthesizer, and an RF filter bank for frequency up-converting the converted secondary intermediate frequency signal to a desired navigation signal band.

The output signal selection module consists of a multi-stage digital variable gain controller and an RF switch with output signal on / off function to ensure operating range of 90dB or more and accuracy less than 0.5dB.

In addition, the RF signal combining module may be composed of a power combiner and an RF filter bank.

The combined satellite navigation signal generator according to the present invention as described above can reduce the overall size of the equipment by constituting the satellite navigation scenario controller and the complex signal generator integrally, There is an effect that can be.

That is, the present invention is composed of a single device, and it is possible to easily generate or remove various types of disturbance signals such as GPS, L1, L2 and L5, such as multiple navigation signals and deaf / jamming signals, By combining the navigation signal and the disturbance signal, it is possible to generate a composite signal similar to the actual environment, so that it can be used not only by the maker of the low-noise signal receiver but also by the schools and research institutes requiring disturbance signal influence analysis. The complexity of the navigation signal test equipment and the hardware purchase / production cost can be drastically reduced.

1 is a block diagram of a composite satellite navigation signal generating apparatus according to the present invention.
2 is a block diagram of an embodiment of an RF signal conversion module according to the present invention.
3 is a block diagram of an embodiment of an output signal selection module according to the present invention.
4 is a block diagram of an embodiment of an RF signal combining module according to the present invention.
5 is a flowchart of an embodiment of a method for generating a composite signal according to the present invention.
6 is a configuration diagram of an example of a conventional satellite navigation simulator interlocked satellite navigation disturbance signal generation system

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a composite satellite navigation signal generating apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention simplifies the structure and is easy to manufacture, and can be supplied at low cost.

The composite satellite navigation signal generating apparatus according to the present invention includes a satellite navigation scenario controller 10 for allowing a user to easily set up a navigation signal, a jamming signal and a jamming signal according to the purpose of use, And a composite signal generator 20 for generating a navigation signal, a jamming signal, and a jamming signal in accordance with the received signal.

The satellite navigation scenario controller 10 is made on a PC basis and can set and change operation parameters for the generated signal and receives the status information of the composite signal generator 20, Under dynamic conditions, navigation data such as satellite orbit, satellite information, and channel information are input and transmitted.

The composite signal generator 20 generates an accurate signal corresponding to the scenario using the parameters of the navigation data and the frequency band of the navigation signal, the deception signal and the jamming signal, the modulation method, and the signal intensity received from the satellite navigation scenario controller 10 And a jamming signal generating module. The signal generating module 22 combines signals generated from the navigation signal generating module 22, the deception signal generating module 23, and the jamming signal generating module, and outputs the signal to the satellite navigation receiver 30 An RF signal conversion module 25, an output signal selection module 26, and an RF signal combination module 27 for transmission.

The composite signal generator 20 separates a satellite navigation / deactivation signal requiring a weak signal and a jamming signal path having a relatively high intensity to generate and combine RF signals, respectively, so that a high JSR (Jamming to Signal Ratio) Signal simulation is possible in real time.

The system further includes an external interface / internal control module 21 for communicating with the satellite navigation scenario controller 10 and controlling the internal configuration module.

The external interface / internal control module 21 is configured by an interface such as Ethernet, USB or RS-232C for 1: 1 communication with the satellite navigation scenario controller 10, which is PC-based software, It is preferable to implement the method by directly controlling the DSP or FPGA.

The navigation signal generation module 22 is a means for generating a signal related to navigation and includes a navigation satellite trajectory generation unit, a navigation message generation unit, an error information processing unit, an IF signal generation unit, and a control unit. And generates multi-channel raw data reflecting the reception environment error, the distance error, and the Doppler frequency shift.

The deception signal generation module 23 generates a signal for deceiving the satellite navigation receiver 30, and generates a signal in which at least one of a navigation satellite orbit, a navigation signal, a signal strength, and a Doppler frequency is changed.

The DDS (Direct Digital Synthesizer) is used as means for generating the jamming signal that causes the jamming signal generation module 24 to disable the satellite navigation receiver 30, and a single tone, multi tone - tone, FSK, PSK, ASK and Linear sweep signals.

The RF signal conversion module 25 is a means for converting a frequency into a band used by the satellite navigation receiver 30. The RF signal conversion module 25 performs a dual frequency conversion . That is, as shown in FIG. 2, a first carrier generator, a first frequency synthesizer, a first band-selective filter, and a second band-pass filter are provided for converting the inputted primary intermediate frequency signal into a secondary intermediate frequency signal. A second frequency synthesizer, and an RF filter bank for frequency up-converting the converted secondary intermediate frequency signal to a desired navigation signal band, thereby maximizing the frequency selectivity.

Since the center frequency and the bandwidth of the primary intermediate frequency input to the RF signal conversion module are different for each of the navigation signals so that various navigation signals can be simulated, the first carrier generator can be converted to a high- DDS type frequency synthesizer, and since the RF navigation signal also has a different center frequency, the second carrier generator is configured by applying a variable PLL.

The output signal selection module 26 is a means for independently outputting a navigation signal, a jamming signal, and a jamming signal. As shown in FIG. 3, the output signal selection module 26 includes a multi-stage digital variable gain controller, (RF) switch with output signal on / off function and high isolation of more than 40dB. When the navigation signal and jamming signal are output independently, I can exclude it.

The RF signal combining module 27 combines independent RF output signals and transmits the RF output signals to the GPS receiver 30. The RF signal combining module 27 includes a power combiner and an RF filter bank, as shown in FIG. The RF signal combining module 27 combines the uplink signal converted up to the RF frequency with the up-converted up-converted RF signal through the RF power combiner, and then outputs the spurious or harmonic frequency By further attenuating the components, the performance of the system can be further improved.

5 is a flowchart of an embodiment of a method for generating a composite signal according to the present invention.

As shown in the figure, the composite signal generating method according to the present invention independently generates a navigation signal, a jamming signal, and a jamming signal, frequency-up-converts the signal, and then controls the output signal level at the RF stage, The result can be obtained and the reliability of the system can be greatly improved.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable form such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, a magneto-optical disk, or the like. Such a process can be easily carried out by those skilled in the art and will not be described in detail.

10: Satellite navigation scenario controller
20: Composite Signal Generator
21: external interface / internal control module 22: navigation signal generating module
23: Trigger signal generation module 24: Jamming signal generation module
25: RF signal conversion module 26: output signal selection module
27: RF signal combining module
30: Satellite navigation receiver

Claims (7)

A navigation signal scenario controller 10 that allows a user to easily set up a navigation signal, a jamming signal, and a jamming signal according to the purpose of use; and a navigation signal controller 10 for controlling a navigation signal, And a composite signal generator (20) for generating a composite signal,
The composite signal generator 20 includes:
An external interface / internal control module (21) for communicating with the satellite navigation scenario controller (10) and controlling the internal configuration module;
A navigation signal generation module (22) for generating a plurality of navigation signals;
A signal generation module (23) for generating a signal for deceiving the navigation device (30);
A jamming signal generating module (24) for generating a jamming signal that disables the satellite navigation receiver (30);
An RF signal conversion module 25 for converting a frequency into a band used by the GPS receiver 30;
An output signal selection module 26 for independently outputting the navigation signal, the tamper signal, and the jamming signal;
And an RF signal combining module (27) for combining and transmitting independent RF output signals to the satellite navigation receiver (30). The method according to claim 1,
Wherein the navigation signal generating module (22) comprises a navigation satellite trajectory generating unit, a navigation message generating unit, an error information processing unit, an IF signal generating unit, and a control unit. The method according to claim 1,
Wherein the deception signal generation module (23) generates a signal in which at least one of a navigation satellite orbit, a navigation signal, a signal intensity, and a Doppler frequency is changed. The method according to claim 1,
The jamming signal generation module 24 is composed of a DDS (Direct Digital Synthesizer), and generates a jamming signal by generating a jamming signal in a single tone, multi-tone, FSK, PSK, ASK, and linear sweep Wherein said complex satellite navigation signal generating apparatus comprises: The method according to claim 1,
The RF signal conversion module 25 includes a first carrier generator, a first frequency synthesizer, and a first band selection filter for converting the inputted primary intermediate frequency signal into a secondary intermediate frequency signal;
A second frequency synthesizer, and an RF filter bank for frequency up-converting the converted secondary intermediate frequency signal to a desired navigation signal band. The method according to claim 1,
The output signal selection module 26 is composed of a multi-stage digital variable gain controller and an RF switch having an output signal on / off function to ensure an operating range of 90 dB or more and an accuracy of 0.5 dB or less Wherein said satellite navigation signal generating apparatus comprises: The method according to claim 1,
Wherein the RF signal combining module (27) comprises a power combiner and an RF filter bank.

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