KR102054324B1 - Gnss receiver for anti-spoofing and method for detecting gnss spoofing attack - Google Patents

Abstract

According to an embodiment of the present invention, in the deception-adaptive satellite navigation receiver, only a reference antenna of a plurality of array antennas constitutes a signal tracking loop composed of a closed loop of the baseband signal processing unit, and the rest of the array antennas. In the baseband signal processing unit, the structure of the deception-compatible satellite navigation receiver can be simplified by using the closed loop correction value of the reference antenna without configuring a signal tracking loop.

Description

Deception-adaptive satellite navigation receiver and deception-response method using same {GNSS RECEIVER FOR ANTI-SPOOFING AND METHOD FOR DETECTING GNSS SPOOFING ATTACK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deception-adaptive satellite navigation receiver and a deception-response method using the same. In particular, a satellite navigation receiver employing an array antenna for coping with deception simplifies the structure of the baseband signal processor and reduces the throughput required for signal tracking The present invention relates to a corresponding satellite navigation receiver and a deception-response method using the same.

In general, satellite navigation, represented by GPS in the United States, is known to be vulnerable to artificial disturbances, jamming and deception.

First, a satellite navigation jamming attack is a method in which a satellite navigation receiver cannot receive a satellite navigation signal by broadcasting a disturbing signal source having a size larger than that of the satellite navigation signal received from the ground. At this time, the strength of the satellite navigation signal received from the ground is -130dBm, etc., the satellite navigation is very vulnerable to jamming attack because it has a very small size below the noise level.

On the other hand, a satellite navigation deception attack is a type of attack in which a signal similar to a satellite navigation signal source is reproduced in a malicious manner and broadcasted to a satellite navigation user, and the satellite navigation receiver receives a malicious reproduced signal source and is misinterpreted or misleading. That's the way. Since the satellite navigation signal that is currently open to the public has all carriers, code characteristics, and navigation messages, satellite navigation receivers cannot distinguish malicious attack signals that are broadcast in a similar form to satellite navigation signals.

Therefore, the recent satellite navigation receivers apply techniques for jamming attack response (hereinafter referred to as "jamming response") and deception attack response (hereinafter referred to as "deception response"), and representative jamming and deception response techniques. There is a method of using an array antenna composed of a plurality of antenna elements.

However, a conventional satellite navigation receiver using an array antenna requires an RF signal processing unit received from a plurality of antennas and hardware for applying a jamming or deception corresponding algorithm after quantizing an RF signal processed satellite navigation signal. It has the disadvantage of being complicated. In particular, the satellite navigation receiver hardware and processing techniques required for coping with deception are very complicated and difficult to apply to conventional array antenna receivers.

(Patent literature)

Republic of Korea Patent No. 10-1498613 (Registration date February 26, 2015)

Therefore, according to an embodiment of the present invention, a satellite navigation receiver and a deception corresponding method using the same, which simplifies the structure of the baseband signal processing unit and reduces the throughput required in the satellite navigation receiver to which the array antenna for deception is applied. To provide.

A satellite navigation receiver for deception according to an embodiment of the present invention described above, the array antenna comprising a plurality of antennas for receiving a satellite navigation signal, and is connected to one of the plurality of antennas, the code of the satellite navigation signal A first baseband signal processing unit for generating a code reproduction signal and a carrier reproduction signal synchronized with a phase and a carrier phase, respectively, and other antennas other than the one of the plurality of antennas, respectively; The code reproducing signal and the carrier reproducing signal are applied, and the code phase error and the carrier phase error between the code reproducing signal and the carrier reproducing signal and the satellite navigation signal received from the antenna connected to one of the remaining antennas are estimated. At least one second baseband signal processor and the first baseband A pseudo distance measurement value and a carrier measurement value for the satellite navigation signal are input from a signal processor, and the code phase error and the carrier phase error of each of the remaining antennas output from the second baseband signal processor are determined by the pseudo distance measurement value and the A preprocessing unit estimating pseudorange measurements and carrier measurements for the satellite navigation signals received at each of the remaining antennas in combination with carrier measurements; and whether or not a deception signal is based on the pseudorange measurements and carrier measurements estimated from the preprocessor Deception correspondence and PVT processing unit to determine the.

The first baseband signal processor may further include: a carrier generator for generating the carrier reproduction signal, a code generator for generating the code reproduction signal, and the satellite navigation signal received from the reference antenna; A carrier processor, a code processor for multiplying the satellite navigation signal received from the reference antenna by the code reproduction signal, and the satellite navigation signal multiplied by the carrier reproduction signal and the code reproduction signal through the carrier processor and the code processor Estimate a code phase difference of the satellite navigation signal and a code phase of the code reproduction signal by using a correlation integral accumulated with a correlation value of, and estimate a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal. And then code the code by The green signal and the reproduced carrier signal characterized in that it includes a tracking loop for synchronizing the code phase and carrier phase of the satellite navigation signal.

The second baseband signal processor may further include a carrier processor for multiplying the carrier reproduction signal provided from the first baseband signal processor and the satellite navigation signals received from the remaining antennas, and the first baseband signal processor. A code processor for multiplying the provided code reproduction signal and the satellite navigation signal received from the remaining antennas, and a correlation value of the satellite reproduction signal multiplied by the carrier reproduction signal and the code reproduction signal through the carrier processor and the code processor; A coder for estimating a code phase difference between the satellite navigation signal and a code phase from the code reproduction signal using a cumulative correlation integral and estimating a carrier phase difference between the carrier navigation phase and the carrier reproduction signal. It is characterized by including.

The plurality of antennas may be arranged to be located within a wavelength of a carrier frequency of the satellite navigation signal.

In addition, the array antenna composed of a plurality of antennas according to an embodiment of the present invention, the first baseband signal processing unit, the second baseband signal processing unit, the deception correspondence by the satellite navigation receiver including a pre-processing unit and the deciphering and PVT processing unit A method comprising: receiving a satellite navigation signal at the plurality of antennas, and synchronizing with a code phase and a carrier phase of the satellite navigation signal received from one of the plurality of antennas at the first baseband signal processing unit, respectively; Generating a code reproduction signal and a carrier reproduction signal, and the code between the satellite navigation signal received from each of the antennas other than the code reproduction signal and the carrier reproduction signal and the one antenna in the second baseband signal processor; Estimating a phase error and a carrier phase error, wherein the preprocessor Pseudo-distance of the satellite navigation signal received from each of the remaining antennas by combining the pseudo-range measurement and the carrier measurement value of the satellite navigation signal received from one antenna and the code phase error and the carrier phase error of each of the remaining antennas Estimating a measurement value and a carrier measurement value, and determining whether or not a deception signal is based on the estimated pseudorange measurement value and the carrier measurement value by the deception correspondence and PVT processing unit.

The generating may include generating the carrier reproduction signal and the code reproduction signal by the first baseband signal processor, and the carrier reproduction signal and the code in the satellite navigation signal received from the one antenna. Multiplying a reproduction signal, accumulating a correlation value of the carrier reproduction signal and the satellite navigation signal multiplied by the code reproduction signal, and generating a correlation integral value; and using the correlation integration value to generate a correlation integration value of the satellite navigation signal. Estimating a code phase difference between the code phase and the code reproduction signal, estimating a carrier phase difference between the carrier phase and the carrier reproduction signal of the satellite navigation signal, and closing the phase difference to compensate for the code reproduction signal and Synchronize the carrier reproduction signal with a code phase and a carrier phase of the satellite navigation signal. Is characterized in that it comprises a step.

The estimating of the error may include multiplying the carrier reproduction signal and the code reproduction signal by the phase navigation signal received from each of the remaining antennas in the second baseband signal processor, and the carrier reproduction signal; Accumulating a correlation value of the satellite navigation signal multiplied by the code reproduction signal to generate a correlation integral value; and using the correlation integration value, a code phase difference between the code phase of the satellite navigation signal and the code phase of the code reproduction signal is calculated. And estimating a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal.

The plurality of antennas may be arranged to be located within a wavelength of a carrier frequency of the satellite navigation signal.

According to an embodiment of the present invention, in the deception-adaptive satellite navigation receiver, only a reference antenna of a plurality of array antennas constitutes a signal tracking loop composed of a closed loop of the baseband signal processing unit, and the rest of the array antennas. In the baseband signal processing unit, the structure of the deception-compatible satellite navigation receiver can be simplified by using the closed loop correction value of the reference antenna without configuring a signal tracking loop.

In addition, as in the embodiment of the present invention, by configuring the signal tracking loop in only one baseband signal processing unit in the deception-adaptive satellite navigation receiver, it is possible to reduce the field programmable gate array (FPGA) capacity, thereby reducing the manufacturing cost. It is possible to reduce the DSP (Digital Signal Processing) throughput required for signal tracking.

1 is a structural diagram of a general satellite navigation receiver.
2 is a structural diagram of an array antenna satellite navigation receiver for jamming;
3 is a structural diagram of an array antenna satellite navigation receiver for general deception.
4 is a structural diagram of a deception-response array antenna satellite navigation receiver to which a parallel baseband signal processing technique is applied according to an embodiment of the present invention;
5 is a flowchart illustrating a deception response operation control in a satellite navigation receiver according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the present invention. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

1 illustrates a structure of a general satellite navigation receiver.

Referring to FIG. 1, a general satellite navigation receiver 100 converts and quantizes a received signal received from a single antenna 102 into an intermediate frequency through an RF signal processing unit 104, and then uses a navigation satellite for baseband signal processing. The individual baseband signal processing unit 106 is configured according to the number to perform signal tracking for individual satellites included in the received RF signal. Subsequently, the position, velocity, and time information of the satellite is calculated through the Positioning Velocity Timing (PVT) processing unit 108.

2 illustrates a structure of an array antenna satellite navigation receiver for jamming correspondence.

Referring to FIG. 2, since the plurality of antenna elements 202 are applied to the satellite navigation receiver 200 of FIG. 2, the RF signal processor 204 processes an RF signal received from each antenna 202. In addition, a device such as a weight control algorithm for anti-jamming 206 is additionally required. The weight control unit 206 combines each RF signal to reduce the gain for the jamming signal and perform a weight adjustment function for improving the gain for the satellite navigation signal.

As such, after applying weights to the RF signals received from the plurality of antennas, one intermediate frequency quantized signal is finally generated. Subsequently, the quantized signal is converted into a baseband signal by the baseband signal processor 208, and the position, velocity, and time information of the satellite is calculated by the PVT processor 210.

At this time, the configuration of the baseband signal processor 208 is the same as that of the baseband signal processor 102 of the general satellite navigation receiver 100 of FIG. Therefore, an FPGA device such as an RF signal processor 204 including a plurality of antennas 202 and a weight controller 206 for implementing a jamming correspondence algorithm are added, so that the hardware complexity of the conventional satellite navigation receiver 100 of FIG. 1 is increased. Will increase.

That is, in the case of the array antenna satellite navigation receiver for jamming, an algorithm for lowering the gain for the jamming signal source and improving the gain for the satellite navigation signal source is applied. In this case, since a technique of minimizing the size of the jamming signal source broadcast at a relatively high intensity is applied to distinguish the jamming signal source and the satellite navigation signal source, the application of the algorithm is performed in the quantized intermediate frequency signal step.

Accordingly, in the array antenna satellite navigation receiver 200 for jamming correspondence shown in FIG. 2, the configuration of the baseband signal processor 208 after the weight controller 206 to which the jamming correspondence algorithm is applied is simplified.

3 illustrates the structure of an array antenna satellite navigation receiver 300 for conventional deception.

Referring to FIG. 3, since the array antenna satellite navigation receiver 300 for deception correspondence uses the carrier phase information received from each antenna 302, unlike the jamming response receiver 200 of FIG. 2, the RF signal processor 304 ) And the baseband signal processor 306 should be configured for each antenna. At the rear end of the baseband signal processor 306, a deception counterpart and an anti-spoofing algorithm and PVT estimator 308 are connected to extract the deception signal and to calculate the position, velocity, and time information of the satellite signal.

At this time, since the deception attack signal source is broadcast at a similar strength to that of the satellite navigation signal, unlike the jamming, it cannot be detected using the existing jamming response technique. Therefore, the phase information of the carrier signal received from the individual antenna is extracted, and the interferometer technique is used to detect whether the received signal source is broadcast from the actual satellite position or the ground deception transmitter. do. Therefore, the array antenna satellite navigation receiver 300 for deception correspondence as shown in FIG. 3 requires the baseband signal processing unit 306 as many as the number of antennas.

Meanwhile, in the case of a general single frequency / single system satellite navigation receiver, at least 12 baseband signal processing channels should be configured. In addition, for the recent multi-frequency multi-system satellite navigation receiver, the baseband signal processing unit 306 should be configured by a multiple of the frequency and the number of systems used.

Accordingly, at least 12 × N baseband signal processing units 306 are required for a single frequency / single system satellite navigation receiver employing an array antenna having N elements, and for a dual frequency GPS / GLONASS satellite navigation receiver. At least 12 × 4 × N baseband signal processing units 306 are required. This results in an increase in the capacity or quantity of FPGAs required for the baseband signal processor 306 configuration. In addition, since digital signal processing (DSP) processing is required for signal tracking control of the individual baseband signal processing unit 306, a memory increase and a high performance DSP are required. Therefore, there is a problem in that the hardware configuration of the satellite navigation receiver 300 becomes complicated and the manufacturing cost increases.

FIG. 4 illustrates a structure of a deception-compatible array antenna satellite navigation receiver 400 to which a parallel baseband signal processing technique is applied according to an embodiment of the present invention.

Referring to FIG. 4, unlike the structure of the conventional satellite navigation receiver 300 illustrated in FIG. 3, the deception-compatible satellite navigation receiver 400 is connected to the RF signal processor 404. The band signal processing units 410 and 420 are configured differently for each antenna.

That is, one reference antenna 402 of the array antennas is selected, and only the baseband signal processor 404 connected to the selected one reference antenna 402 is the carrier processor 412, the code processor 414, or the tracking loop. A closed loop signal tracking loop including a loop 416, a carrier NCO 419, a code generator NCO 418, and the like is applied.

In addition to the reference antenna 402, the baseband signal processor 405 connected to the remaining antenna 403 includes a carrier NCO 419 and a code generator 418 for signal tracking. Do not have a loop. Instead, the baseband signal processor 420 connected to the remaining antennas 403 in addition to the reference antenna 402 is a carrier regeneration signal generated by the baseband signal processor 410 of the reference antenna 402, a code regeneration signal. The code NCO1 value is used as an input for carrier and code signal tracking.

Meanwhile, a signal tracking loop including a tracking loop 416, a carrier NCO 419, a code generator NCO 418, and the like are cores of the baseband signal processor 410. As a component, it consumes significant amounts of FPGA capacity. Accordingly, in the satellite navigation receiver 400 according to the embodiment of the present invention shown in FIG. 4, the signal tracking loop is connected to the baseband signal processor 420 connected to the other antenna 403 except for one reference antenna 402. You can reduce FPGA capacity by not configuring In this case, since the baseband signal processing unit 420 does not have a signal tracking loop configuration, the baseband signal processing unit 420 does not require a DSP function required for signal tracking, thereby reducing the DSP calculation amount.

The antenna elements of the satellite positioning antenna are also designed to lie within the wavelength of the carrier frequency of the navigation satellite signal. Therefore, the satellite navigation signals received by the plurality of antenna elements have a propagation path difference within several cm, and thus have high correlation with each other.

Accordingly, parallel signal processing in the satellite navigation receiver according to an embodiment of the present invention differs from a carrier reproduction signal and a code reproduction signal generated by a reference antenna by using the correlation of the satellite navigation signals received from the plurality of antennas as described above. It is used as an input to the baseband signal processing received from the antenna, and the error caused by this is estimated to compensate for the measurement.

Referring to FIG. 4, the antenna input signal Sk applied to the baseband signal processor 410 of the reference antenna 402 may be represented by Equation 1 below.

는 도플러와 위상이 반영된 값이다. In Equation 1, A is the strength of the input signal, C is the phase of the code signal, D is the navigation data bit,

Is a value reflecting Doppler and phase.

In the carrier generator 419 and the code generator 418 of FIG. 4, a carrier reproduction signal and a code reproduction signal are generated, respectively, to generate an antenna input signal and a code phase as shown in Equation 1, Carrier Doppler, phase-locked.

In the carrier generator 419, carrier signals of in-phase and quad-phase are generated as in Equation 2 below and multiplied by the input signal.

는 입력신호의 반송파 위상을 추정하기 위한 반송파 추적필터의 결과물이다. In [Equation 2] above

Is the result of the carrier tracking filter for estimating the carrier phase of the input signal.

The code reproducing signal generated by the code generator 418 is classified into Early, Prompt, and Late, and the half code phase is delayed or the half code phase is advanced to the target code phase to be tracked. Generate an early signal and use it as the input to the code tracking loop. Equation 3 below is a model equation of a code reproduction signal generated by the code generator 418.

는 추적루프(416)에 의해서 수신된 신호의 코드 위상과 동기되는 코드 위상값이고, d는 코드 1 chip에 해당하는 시간 지연을 의미한다. here

Denotes a code phase value synchronized with a code phase of a signal received by the tracking loop 416, and d denotes a time delay corresponding to a code 1 chip.

The correlation integral value used as the input of the tracking loop 416 by multiplying the carrier reproduction signal and the code reproduction signal generated as described above is a total of six as shown in [Equation 4] to [Equation 6] below. Modeled as I, Q.

는 도플러 오차, T는 상관적분 시간,

는 입력 신호의 세기, No는 잡음 수준,

는 입력신호와 동기된 위상 지연

를 입력으로 했을 경우의 상관값, D는 항법 데이터 비트,

는 반송파 위상 오차를 의미한다. In [Equation 4] to [Equation 6] above

Is the Doppler error, T is the integral time,

Is the strength of the input signal, No is the noise level,

Is the phase delay synchronized with the input signal.

Is the correlation value when D is the input, D is the navigation data bit,

Denotes a carrier phase error.

과 코드 위상

가, 실제 입력되는 위성항법 신호의 반송파 위상 및 코드 위상과의 차이를 추정하고, 그 오차 만큼을 폐루프 보상한다. The signal tracking loop of the baseband signal processor 410 using the correlation integral values of Equations 4 to 6 as described above is performed by the receiver every time the carrier phase is reproduced.

And code phase

The difference between the carrier phase and the code phase of the satellite navigation signal actually input is estimated, and the closed loop compensation is performed for the error.

는 각각 반송파와 코드의 위상 오차이다. Therefore, when a signal tracking loop configured as a closed loop is provided as in the baseband signal processor 410 connected to the reference antenna 402 of FIG. 4, an appropriate carrier phase and a code phase are reproduced to generate a signal tracking input carrier generator ( 419) and the code generator 418, the tracking error converges to zero. At this time, the tracking loop 416 has a discriminator (discriminator) for estimating the error of the satellite navigation signal input by processing [Equation 4] to [Equation 6] and the reproduction signal reproduced by the receiver 400 The discriminator generally used for the carrier and the code estimates the error as shown in Equation 7 and Equation 8. At this time,

Are the phase errors of the carrier and code, respectively.

As described above, the carrier and code phase errors of the baseband signal processed by the baseband signal processor 410 connected to the reference antenna of FIG. 4 converge to zero.

However, in the baseband signal processing unit 420 that processes signals input from the remaining antennas 403 other than the reference antenna 402, carrier and code phase estimate values based on signals received from the reference antenna, rather than self-closed loop compensation inputs, Since the carrier regeneration signal Carrier NCO1 and the code regeneration signal Code NCO1 are used as inputs, the carrier and code phase errors calculated by Equations 7 and 8 are generated.

However, since the positions of the antennas are close to each other, the antenna is limited to the error level as much as the distance difference between the antennas and the satellites caused by the geometric relationship between the positions of the satellites and the array antennas.

Therefore, in the exemplary embodiment of the present invention, the baseband signal processor 420 connected to the antenna 403 other than the reference antenna 402 as shown in FIG. 4 has a carrier processor 422 and a code processor 424 instead of a closed loop controller. The structure of the receiver is simplified by applying only the discriminator 426 and then applying the preprocessing process in the deception algorithm.

In addition, the baseband signal processing unit 410 connected to the reference antenna 402 of FIG. 4 performs baseband signal processing on the satellite navigation signal input from the reference antenna 402, and then outputs a pseudo range measurement value and a carrier measurement value. The pseudorange measurement value and the carrier measurement value may be input to a pre-processing unit 430 which performs preprocessing of the deception corresponding algorithm. In this case, the pseudo range measurement value and the carrier measurement value may be defined as shown in Equations 9 and 10 below.

In Equations 9 and 10, the subscript is the number of the antenna (assuming No. 1 as the reference antenna), and the superscript is a channel number assigned to the received satellite.

On the other hand, since the baseband signal processing unit 420 that processes signals input from other antennas 403 other than the reference antenna 402 does not have a carrier generator and a code generator, the pseudo-range and carrier measurement values Cannot be generated. Therefore, the preprocessor 430 according to an embodiment of the present invention outputs an error output from the discriminator 426 of the remaining antenna 403 except for the reference antenna 402 and the baseband signal processor 410 of the reference antenna 402. Equation (9) and [Equation 10] representing the pseudorange measurement value and the carrier measurement value outputted are implemented to estimate the measurement values at the remaining antenna 403 in addition to the reference antenna 402.

는 각각 반송파와 코드위상의 오차를 의미한다. At this time, for example, the values of the carrier reproduction signal Carrier NCO1 and the code reproduction signal Code NCO1 for estimating a signal received from antenna 1, which is the reference antenna 402, are correlated with the signals received from antenna 2 403. The correlation integral value obtained by correlation may be modeled as in Equation 11 to Equation 13 below. here

Denote errors of carrier and code phase, respectively.

를 각 위성에 대하여 계산할 수 있고, 이것은 물리적으로 1번 안테나(402)와 2번 안테나(403)에서 수신되는 반송파 위상과 의사거리의 차이를 의미한다. 아래의 [수학식 14]와 [수학식 15]는 2번 안테나(403)에서 추정된 각 위성에 대한 반송파 및 코드 위상 오차를 정의한 식이다. When the correlation integral results of Equations 11 to 13 are processed as the inputs of the discriminator 426 of Equations 7 and 8, the signal of the antenna 2 of the antenna 403 is 1 Error that occurs because the signal is processed by the reference antenna 402

Can be calculated for each satellite, and this means the difference between the carrier phase and the pseudo distance received from the antenna 1 and the antenna 403. [Equation 14] and [Equation 15] below are equations for defining carrier and code phase errors for each satellite estimated by the antenna 403.

Accordingly, the pseudo range and carrier measurement values finally output from the baseband signal processor 420 connected to the second antenna 403 may be estimated as in Equations 16 and 17 below. In this case, C means the speed of light.

Code and carrier phase errors, pseudoranges, and carrier measurements for antenna 2 (403) described in [Equations 14] to [Equation 17] above are all antennas 403 except for reference antenna 402. It can be applied to the baseband signal processor 420 connected to. That is, the preprocessor 430 defines pseudorange and carrier measurement estimated values for any i-th antenna 403 except for the first reference antenna 402 as shown in Equations 18 and 19 below. can do.

That is, according to an embodiment of the present invention, even in the baseband signal processing unit 420 which does not form its own closed loop signal tracking loop, the pseudorange and carrier measurement values are estimated as shown in Equation 18 and Equation 19. The circuit structure of the baseband signal processing units 410 and 420 of the deception-adaptive satellite navigation receiver 400 can be configured relatively simply, so that the hardware complexity of the deception-adaptive satellite navigation receiver can be improved. The cost can also be reduced.

FIG. 5 illustrates a flow of deceptive response control in a deceptive array antenna satellite navigation receiver 400 to which a parallel baseband signal processing technique is applied in accordance with an embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 5.

First, the satellite navigation receiver 400 according to an embodiment of the present invention receives a satellite navigation signal from an array antenna composed of a plurality of antennas for receiving the satellite navigation signal (S500).

Subsequently, the satellite navigation receiver 400 includes a tracking loop 416, a carrier NCO 419, and a code for a satellite navigation signal received from a reference antenna 402 selected from a plurality of antennas. A code reproducing signal and a carrier reproducing signal, which are respectively synchronized with the code phase and the carrier phase of the satellite navigation signal, are generated through a signal tracking loop including a generator (Code NCO) 418 (S502).

In addition, the satellite navigation receiver 400 generates a code reproducing signal and a carrier reproducing signal and a carrier phase and a code phase error between the satellite navigation signals received from each of the antennas 403 except for one reference antenna 402. The error is estimated (S504).

Subsequently, the satellite navigation receiver 400 estimates the pseudo-range measurement and the carrier measurement of the satellite navigation signal calculated through the satellite navigation signal received from one reference antenna 402, respectively, estimated at each of the remaining antennas 403. Error and the carrier phase error are combined (S506).

Then, the satellite navigation receiver 400 estimates the pseudo range measurement value and the carrier measurement value of the satellite navigation signal for each satellite navigation signal received from each of the remaining antennas 403 through the above combination (S508).

As described above, according to an embodiment of the present invention, in the deception-adaptive satellite navigation receiver, a signal tracking loop composed of a closed loop of a baseband signal processing unit is configured only for one reference antenna among a plurality of antennas. In addition, the baseband signal processing unit of the remaining antennas do not form a signal tracking loop, and by using the closed loop correction value of the reference antenna, the structure of the deception-compatible satellite navigation receiver can be simplified.

Combinations of the steps of each flowchart attached to the present invention may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that the instructions performed through the processor of the computer or other programmable data processing equipment are described in each step of the flowchart. It will create a means to perform them. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored therein to produce an article of manufacture containing instruction means for performing the functions described in each step of the flowchart. Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for executing the functions described in each step of the flowchart.

In addition, each step may represent a module, segment or portion of code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative embodiments, the functions noted in the steps may occur out of order. For example, the two steps shown in succession may in fact be performed substantially simultaneously or the steps may sometimes be performed in the reverse order, depending on the function in question.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

404, 405: RF signal processing unit 410, 420: baseband signal processing unit
412 carrier carrier 414 code processor
416: tracking loop 418: code generator
419: carrier generator 426: discriminator
430: preprocessing unit

Claims (8)

An array antenna comprising a plurality of antennas for receiving a satellite navigation signal;
A first baseband signal processor connected to one of the plurality of antennas, the first baseband signal processing unit generating a code reproduction signal and a carrier reproduction signal which are respectively synchronized with a code phase and a carrier phase of the satellite navigation signal;
A code reproduction signal and the carrier reproduction signal generated by the first baseband signal processor, and are respectively connected to the other antennas other than the one of the plurality of antennas; At least one second baseband signal processor for estimating a code phase error and a carrier phase error between the satellite navigation signals received from one of the remaining antennas;
Receiving the pseudo-range measurement value and the carrier measurement value for the satellite navigation signal from the first baseband signal processor, and the code phase error and the carrier phase error of each of the remaining antennas output from the second baseband signal processor; A preprocessor for combining the pseudorange measurements and the carrier measurements to estimate pseudorange measurements and carrier measurements for the satellite navigation signals received at each of the remaining antennas;
It includes a deception correspondence and PVT processing unit for determining whether the deception signal based on the pseudo range measurement value and the carrier measurement value estimated from the pre-processing unit
Deception-adaptive satellite navigation receiver.
The method of claim 1,
The first baseband signal processor,
A carrier generator for generating the carrier reproduction signal;
A code generator for generating the code reproduction signal;
A carrier processor for multiplying the satellite reproduction signal by the carrier reproduction signal received from a reference antenna selected from the plurality of antennas;
A code processor for multiplying the code reproduction signal by the satellite navigation signal received from the reference antenna;
The code phase of the satellite navigation signal and the code reproduction signal are obtained by using a correlation integral value obtained by accumulating a correlation value between the carrier reproduction signal and the satellite navigation signal multiplied by the code reproduction signal through the carrier processor and the code processor. Estimating a code phase difference, estimating a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal, and then performing a closed loop compensation of the phase difference to compensate the code reproduction signal and the carrier reproduction signal for the satellite navigation signal. A tracking loop that synchronizes the code phase and carrier phase of
Deception-adaptive satellite navigation receiver.
The method of claim 1,
The second baseband signal processor,
A carrier processor for multiplying the carrier reproduction signal provided from the first baseband signal processor and the satellite navigation signal received from each of the remaining antennas;
A code processor for multiplying the code reproduction signal provided from the first baseband signal processor and the satellite navigation signal received from the remaining antennas;
The code phase of the satellite navigation signal and the code reproduction signal are obtained by using a correlation integral value obtained by accumulating a correlation value of the satellite navigation signal multiplied by the carrier reproduction signal and the code reproduction signal by the carrier processor and the code processor. A discriminator for estimating a code phase difference and estimating a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal;
Deception-adaptive satellite navigation receiver.
The method of claim 1,
The plurality of antennas,
Arranged to be located within a wavelength of a carrier frequency of the satellite navigation signal.
Deception-adaptive satellite navigation receiver.
An array antenna comprising a plurality of antennas, a first baseband signal processing unit, a second baseband signal processing unit, a deception correspondence method by a satellite navigation receiver including a preprocessing unit and a deception correspondence and a PVT processing unit,
Receiving satellite navigation signals at the plurality of antennas;
Generating, by the first baseband signal processor, a code reproduction signal and a carrier reproduction signal synchronized with a code phase and a carrier phase of the satellite navigation signal received from one of the plurality of antennas, respectively;
Estimating, by the second baseband signal processor, a code phase error and a carrier phase error between the code reproduction signal, the carrier reproduction signal, and the satellite navigation signals received from each of the antennas other than the one antenna;
The satellite received from each of the remaining antennas by combining the pseudo-range measurement and the carrier measurement value of the satellite navigation signal received from the one antenna and the code phase error and the carrier phase error of each of the remaining antennas in the preprocessor; Estimating pseudorange measurements and carrier measurements of the navigation signal;
And determining, by the deception correspondence and PVT processing unit, whether the deception signal is based on the estimated pseudorange measurement value and the carrier measurement value.
Deception-response method by satellite navigation receiver.
The method of claim 5,
The generating step,
Generating the carrier reproduction signal and the code reproduction signal by the first baseband signal processor;
Multiplying the satellite navigation signal received from the one antenna by the carrier reproduction signal and the code reproduction signal;
Generating a correlation integral value by accumulating a correlation value of the satellite reproduction signal multiplied by the carrier reproduction signal and the code reproduction signal;
Estimating a code phase difference of the satellite navigation signal and a code phase signal of the code reproduction signal by using the correlation integral value, and estimating a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal;
Closed-compensating the phase difference to synchronize the code reproduction signal and the carrier reproduction signal with the code phase and the carrier phase of the satellite navigation signal.
Deception-response method by satellite navigation receiver.
The method of claim 5,
Estimating the error,
Multiplying the carrier reproduction signal and the code reproduction signal by the satellite navigation signal received from each of the remaining antennas in the second baseband signal processor;
Generating a correlation integral value by accumulating a correlation value between the carrier reproduction signal and the satellite navigation signal multiplied by the code reproduction signal;
Estimating a code phase difference of the satellite navigation signal and a code phase signal of the code reproduction signal using the correlation integration value, and estimating a carrier phase difference between the carrier phase of the satellite navigation signal and the carrier reproduction signal.
Deception-response method by satellite navigation receiver.
The method of claim 5,
The plurality of antennas,
Arranged to be located within a wavelength of a carrier frequency of the satellite navigation signal.
Deception-response method by satellite navigation receiver.

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