KR102588296B1 - Apparatus for Tracking a Satellite Navigation Signal - Google Patents

Abstract

An apparatus for tracking satellite navigation signals is disclosed. The disclosed device includes a sinusoidal signal generating unit configured to generate a sinusoidal signal, a code generating unit configured to generate a reference code, an early phase code, and a late phase code, and a digitized satellite navigation signal, the sinusoidal signal, the reference code, and the early phase code. Responsive to the phase code and the late phase code, (i) a first correlation value between the digitized satellite navigation signal, the sinusoidal signal and the reference code, over a predetermined period, (ii) over a predetermined period, a second correlation value between the digitized satellite navigation signal, the sinusoidal signal and the early phase code; and (iii) a third correlation between the digitized satellite navigation signal, the sinusoidal signal and the late phase code over the predetermined period. It may include an integral dump unit configured to output a value. The frequency of the sinusoidal signal is the same as the frequency of the carrier wave of the digitized satellite navigation signal, and the code generator further generates the reference code, the early phase code, and the late phase code using an N-bit first integrator. It can be configured.

Description

Apparatus for Tracking a Satellite Navigation Signal}

The following disclosure relates to satellite navigation signal processing technology.

GNSS (Global Navigation Satellite System) is known as a system that uses multiple artificial satellites and ground receiving equipment to determine the location of a target and provide visual information. Currently operating GNSSs include GPS (Global Positioning System) operated by the United States, GLONASS (Global Orbiting Navigation Satellite System) operated by Russia, GALILEO (European Satellite Navigation System) operated by the European Union, and Japan-operated GNSS. There is QZSS (Quasi-Zenith Satellite System), etc. The GNSS navigation receiver performs signal processing for signal acquisition, signal tracking, and data decoding on satellite signals. Among these, signal processing for signal acquisition is for estimating the phase and Doppler frequency of the code included in the satellite signal, and signal processing for signal tracking is for continuously tracking the acquired signal. Conventionally, much research has been conducted on efficient signal processing in the field of signal processing for signal acquisition and tracking.

The problem to be solved by the present disclosure is to provide improved technology for quickly and efficiently performing signal processing for tracking satellite navigation signals.

The problems to be solved by the present disclosure are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to one aspect of the present disclosure, an apparatus for tracking satellite navigation signals is provided. The apparatus includes a sinusoidal signal generating unit configured to generate a sinusoidal signal, a code generating unit configured to generate a reference code, an early phase code, and a late phase code, and a digitized satellite navigation signal, the sinusoidal signal, the reference code, and the early phase code. Responsive to the phase code and the late phase code, (i) a first correlation value between the digitized satellite navigation signal, the sinusoidal signal and the reference code, over a predetermined period, (ii) over a predetermined period, a second correlation value between the digitized satellite navigation signal, the sinusoidal signal and the early phase code; and (iii) a third correlation between the digitized satellite navigation signal, the sinusoidal signal and the late phase code over the predetermined period. It may include an integral dump unit configured to output a value. The frequency of the sinusoidal signal is the same as the frequency of the carrier wave of the digitized satellite navigation signal, and the code generator further generates the reference code, the early phase code, and the late phase code using an N-bit first integrator. It can be configured.

In one embodiment, the digitized satellite navigation signal is provided by sampling an analog satellite navigation signal at a sampling frequency, and the sinusoidal signal generator is further configured to generate the sinusoidal signal using the N-bit second integrator. The N-bit second integrator operates to provide an accumulated value added by a predetermined increment value at each sampling period determined by the sampling frequency and is reset when the limit value is reached, and the generated sinusoidal signal is the N When the second integrator of the bit is reset, it has a phase of 0 degrees.

In one embodiment, the predetermined increment value is determined by the frequency of the carrier wave, the sampling frequency, and the number of bits (N) of the second integrator.

In one embodiment, the digitized navigation satellite signal includes a code, wherein the reference code, the early phase code and the late phase code mimic the code of the digitized navigation satellite signal and have different phases.

In one embodiment, the digitized satellite navigation signal is provided by sampling the analog satellite navigation signal at a sampling frequency, and the N-bit first integrator adds a predetermined increment value at each sampling period determined by the sampling frequency. It provides an accumulated value and is reset when a limit value is reached, the generated reference code has a first state and a second state, and when the N-bit first integrator is reset, the first integrator is reset from the first state to the second state. transition to or from the second state to the first state, the generated late phase code has the first state and the second state, and the accumulated value of the first integrator of the N bits is the first value. When there is a transition from the first state to the second state or from the second state to the first state, the generated early phase code has the first state and the second state, and the N bits of the first 1 When the accumulated value of the integrator becomes a second value, there is a transition from the first state to the second state or from the second state to the first state, and the second value is greater than the first value.

In one embodiment, the predetermined increment value is determined by the chip rate of the digitized satellite navigation signal, the sampling frequency, and the number of bits (N) of the first integrator.

In one embodiment, the integral dump unit includes a first encoder converter configured to convert the digitized satellite navigation signal into its magnitude and its sign to provide magnitude output and sign output, and convert the sinusoidal signal into its magnitude and sign. a second encoder converter configured to convert the early phase code into its code to provide a magnitude output and a sign output, a first code converter configured to convert the reference code into its code to provide a sign output, and convert the early phase code into its code to provide a sign output. a second code converter configured to provide, a third code converter configured to convert the late phase code to its code and provide a code output, responsive to the code output of the first code converter and the code output of the second code converter. A first sign discriminator configured to provide a first sign output, a second sign discriminator configured to provide a second sign output in response to the first sign output and the sign output of the first sign converter, and the first sign output. A third sign discriminator configured to provide a third sign output in response to the output and the sign output of the second sign converter, and providing a fourth sign output in response to the first sign output and the sign output of the third sign converter. a fourth sign discriminator configured to provide a magnitude value by multiplying the magnitude output of the first encoder converter and the magnitude output of the second encoder converter, the magnitude value and the second sign output representing a second multiplier configured to multiply a sign to provide a first output value, a third multiplier configured to multiply a sign indicated by the magnitude value and the third sign output to provide a second output value, and the magnitude value and the fourth sign. and a fourth multiplier configured to multiply the sign indicated by the output to provide a third output value.

In one embodiment, the digitized navigation satellite signal is provided by sampling an analog satellite navigation signal at a sampling frequency, and the digitized navigation satellite signal, the sinusoidal signal, the reference code, the early phase code, and the late phase code. The sample values are each updated at each sampling period determined by the sampling frequency, and the integral dump unit integrates the sequentially updated first output values over the predetermined period to provide the first correlation value. A first integral dumper configured to provide the second correlation value by integrating the sequentially updated second output values over the predetermined period, and the sequentially updated third output value It further includes a third integration dumper configured to integrate over the predetermined period to provide the third correlation value.

In one embodiment, the digitized navigation satellite signal includes a code, and the predetermined period corresponds to one period of the code.

In one embodiment, the first integral dumper is further configured to provide the first correlation value during a next predetermined period following the predetermined period, and the second integral dumper is configured to provide the second correlation value during the next predetermined period. and further configured to provide the third correlation value during the next predetermined period.

According to the disclosed embodiments, there is a technical effect of being able to quickly and efficiently perform signal processing for tracking satellite navigation signals.

1 is a block diagram of an embodiment of a satellite navigation signal processing system.
FIG. 2 is a detailed block diagram of one embodiment of the signal tracking module of FIG. 1.
FIG. 3 is a diagram illustrating an example of a waveform showing accumulated values of an N-bit second integrator included in the sinusoidal signal generator of FIG. 2 and a sinusoidal signal generated accordingly.
FIG. 4 is a diagram illustrating examples of waveforms representing accumulated values of the N-bit first integrator included in the code generator of FIG. 2 and examples of waveforms of the reference code, early phase code, and late phase code generated accordingly. .
Figure 5 is a diagram showing a detailed block diagram of one embodiment of the integral dump unit of Figure 2.
FIG. 6 is a diagram showing examples of outputs of the first, second, and third integral dumpers of FIG. 5.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be changed and implemented in various forms. Accordingly, the actual implementation form is not limited to the specific disclosed embodiments, and the scope of the present disclosure includes changes, equivalents, or substitutes included in the technical idea described in the embodiments.

Although terms such as “first” or “second” may be used to describe various components, these terms should be interpreted only for the purpose of distinguishing one component from another component. For example, a “first component” may be named a “second component” and similarly, a “second component” may also be named a “first component”.

When a component is referred to as being “connected” to another component, it should be understood that it may be directly connected or connected to the other component, but that other components may exist in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present disclosure, terms such as "comprise" or "have" are intended to designate the presence of the described features, numbers, steps, operations, components, parts, or combinations thereof, and are intended to indicate the presence of one or more other features or numbers, It should be understood that this does not exclude in advance the possibility of the presence or addition of steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present disclosure. No.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. In the description with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted.

1 is a block diagram of an embodiment of a satellite navigation signal processing system.

As shown in FIG. 1, the satellite navigation signal processing system 100 includes an antenna 122, an RF unit 134, an analog-to-digital converter (ADC) 146, a signal acquisition module 178, and signal tracking. It may include module 184. The antenna 122 is a satellite navigation signal (satellite) that is radio-modulated from a global navigation satellite system (GNSS) such as Global Positioning System (GPS), European Satellite Navigation System (GALILEO), and Quasi-Zenith Satellite System (QZSS). It may be configured to receive a navigation signal). The RF unit 134 down-converts the radio-modulated satellite navigation signal to produce a satellite navigation signal (IF: Intermediate Frequency) band. ) can be configured to output. Satellite navigation signals in the mid-frequency band ( ) can be expressed as Equation 1 below.

here represents a satellite navigation signal in the intermediate frequency band, represents the size of the satellite navigation signal, Is It has a wave pattern with a value of and represents a code that can vary depending on the satellite receiving the signal, Is Represents satellite data that is a waveform pattern with a value of represents the intermediate frequency, represents the Doppler frequency, which may vary depending on the dynamic situation of the satellite receiving the signal and the user, represents the initial phase of the signal.

The ADC (146) is a satellite navigation signal in the intermediate frequency band, which is an analog signal ( ) is A/D converted to digitized satellite navigation signal in the mid-frequency band ( ) can be configured to output. In one embodiment, the ADC 146 is a satellite navigation signal (satellite navigation signal) in the mid-frequency band with a sampling frequency of several tens of MHz. ) may be configured to sample. For example, the ADC 146 is a satellite navigation signal (mid-frequency band) with a sampling frequency of 40 MHz. ) may be configured to sample. In one embodiment, ADC 146 may be a 2-bit ADC. The signal acquisition module 178 receives the digitized satellite navigation signal of the intermediate frequency band ( ) can be configured to obtain a satellite navigation signal by performing signal processing on the. The signal acquisition module 178 is a code of the satellite navigation signal ( ) phase and Doppler frequency ( ) can be configured to perform various signal processing to estimate. The signal tracking module 184 collects the Doppler frequency from the signal acquisition module 178 ( Satellite navigation signals in the mid-frequency band digitized in response to information about ( ), intermediate frequency and Doppler frequency ( Code of the sinusoidal signal and satellite navigation signal with the same frequency as the carrier frequency, which is the sum of ) ( ) outputs correlation values between various codes that simulate ). These correlation values are the Doppler frequency estimated in the signal acquisition module 178 ( ) and readjust the code of the satellite navigation signal ( ) can be used to adjust the chip rate. Although not shown, the signal output from the signal tracking module 184 is supplied to one or more subsequent signal processing modules to perform necessary subsequent signal processing.

FIG. 2 is a detailed block diagram of one embodiment of the signal tracking module of FIG. 1.

As shown in Figure 2, the signal tracking module 184 is a digitized satellite navigation signal ( A sinusoidal signal generator 210 configured to generate a sinusoidal signal having the same frequency as the frequency of the carrier wave and a digitized satellite navigation signal ( )'s code ( ) and may include a code generator 220 configured to generate a reference code, an early phase code, and a late phase code having different phases. The code generator 220 may include an N-bit first integrator and may be further configured to generate a reference code, an early phase code, and a late phase code using the same (where N is a natural number). The sinusoidal signal generator 210 may include an N-bit second integrator and may be further configured to generate a sinusoidal signal using the second integrator. The signal tracking module 184 is a digitized satellite navigation signal ( ), an integral dump unit 230 configured to output several correlation values in response to the sinusoidal signal from the sinusoidal signal generating unit 210 and the reference code, early phase code, and late phase code from the code generating unit 220. It can be included. The correlation values output from the integral dump unit 230 are (i) a digitized satellite navigation signal over a predetermined time period ( ), a first correlation value between the sinusoidal signal and the reference code, (ii) a digitized satellite navigation signal over a predetermined time period ( ), a second correlation value between the sinusoidal signal and the early phase code, and (iii) a digitized satellite navigation signal over a predetermined time period ( ), may include a third correlation value between the sinusoidal signal and the late phase code. In one embodiment, the predetermined period of time is code ( ) corresponds to one cycle of

FIG. 3 is a diagram illustrating an example of a waveform showing accumulated values of an N-bit second integrator included in the sinusoidal signal generator of FIG. 2 and a sinusoidal signal generated accordingly.

As shown in FIG. 3, the N-bit second integrator may provide an accumulated value added by a predetermined increment value for each sampling period determined by the sampling frequency. However, the cumulative value is Whenever the corresponding limit value is reached, the accumulated value is reset to 0 and rises again in the same pattern. As a result, the N-bit second integrator provides accumulated values forming a sawtooth waveform. In one embodiment, the predetermined increment value may be determined by the carrier frequency, sampling frequency, and number of bits (N) of the second integrator as shown in Equation 2 below.

here, represents the predetermined increment value of the second integrator of N bits, represents the carrier frequency, represents the sampling frequency.

As shown, the sinusoidal signal generator 210 may generate a sinusoidal signal with a phase of 0 degrees at the point when the N-bit second integrator is reset. The sinusoidal signal generator 210 may be further configured to store sample values of the sinusoidal signal in a look-up table and output one sample per sampling period.

FIG. 4 is a diagram illustrating examples of waveforms representing accumulated values of the N-bit first integrator included in the code generator of FIG. 2 and examples of waveforms of the reference code, early phase code, and late phase code generated accordingly. .

As described above, the code generator 220 may be configured to generate a reference code, an early phase code, and a late phase code using an N-bit first integrator. Here, the number of bits (N) of the first integrator is the digitized satellite navigation signal ( ) can be determined based on the chip speed and sampling frequency. For example, if the chip speed is 1.023MHz and the sampling frequency is 40MHz, N can be set to 31. As shown in FIG. 4, the N-bit first integrator may provide an accumulated value added by a predetermined increment value for each sampling period determined by the sampling frequency. However, the cumulative value is Whenever the corresponding limit value is reached, the accumulated value is reset to 0 and rises again in the same pattern. As a result, the N-bit first integrator provides accumulated values forming a sawtooth waveform. In one embodiment, the predetermined increment value is a digitized satellite navigation signal. It can be determined by the following Equation 3 according to the chip rate, sampling frequency, and number of bits (N) of the first integrator.

here, represents the predetermined increment value of the first integrator of N bits, is a digitized satellite navigation signal ( ) represents the chip speed, represents the sampling frequency.

As shown, the generated reference code may have a first state and a second state. In one embodiment, the first state may be -1 and the second state may be 1. The code generator 220 may control the reference code to transition from the first state to the second state or from the second state to the first state when the N-bit first integrator is reset. The generated late phase code may have a first state and a second state. In one embodiment, the first state may be -1 and the second state may be 1. The code generator 220 may control the late phase code to transition from the first state to the second state or from the second state to the first state when the accumulated value of the N-bit first integrator becomes the first value. . The generated early phase code may have a first state and a second state. In one embodiment, the first state may be -1 and the second state may be 1. The code generator 220 transitions the early phase code from the first state to the second state or from the second state to the first state when the accumulated value of the N-bit first integrator becomes a second value greater than the first value. It can be controlled as much as possible. As shown, the early phase code is faster than the baseline code. The phase can be as fast as The phase can be as fast as that.

Figure 5 is a diagram showing a detailed block diagram of one embodiment of the integral dump unit of Figure 2.

According to the present disclosure, the integral dump unit 230 converts each of the input signals into its magnitude and/or sign, combines them, multiplies them, and cumulatively integrates the multiplication results over a predetermined time period. It can be designed to calculate correlation values between them. In the present disclosure, the signals input to the integral dump unit 230 are referred to as satellite navigation signals, sinusoidal signals, reference codes, early phase codes, and late phase codes for convenience of explanation, but these signals are all digitized discrete signals. Therefore, each of these signals should be understood as having their samples synchronized with the clock and input to the integral dump unit 230 one by one.

As shown in Figure 5, the integral dump unit 230 is a digitized satellite navigation signal ( ) a first encoder converter 505 configured to convert the magnitude and its sign to provide magnitude output and sign output, and a second encoder converter 505 configured to convert the sinusoidal signal into its magnitude and its sign to provide magnitude output and sign output. A code converter 510, a first code converter 515 configured to convert a reference code into its code and provide a code output, a second code converter 520 configured to convert an early phase code into its code and provide a code output. ) and a third sign converter 525 configured to convert the late phase code into its sign and provide a sign output. The integral dump unit 230 includes a first sign discriminator 530 configured to provide a first sign output in response to the sign output of the first encoder converter 505 and the sign output of the second encoder converter 510. , a second sign discriminator 535 configured to provide a second sign output in response to the first sign output and the sign output of the first sign converter 515, the first sign output and the sign of the second sign converter 520. a third sign discriminator 540 configured to provide a third sign output in response to the output and a fourth sign configured to provide a fourth sign output in response to the first sign output and the sign output of the third sign converter 525 It may further include a discriminator 545. The integral dump unit 230 includes a first multiplier 550 configured to provide a magnitude value by multiplying the magnitude output of the first encoder converter 505 and the magnitude output of the second encoder converter 510, the magnitude value, and the second encoder converter 510. a second multiplier 555 configured to multiply the sign indicated by the two-sign output to provide a first output value, a third multiplier 560 configured to multiply the magnitude value and the sign indicated by the third sign output to provide a second output value, and It may further include a fourth multiplier 565 configured to provide a third output value by multiplying the magnitude value and the sign indicated by the fourth sign output. In one embodiment, each of the sign outputs may be a 0 to indicate a negative sign or a 1 to indicate a positive sign. In one embodiment, the first sign discriminator 530, the second sign discriminator 535, the third sign discriminator 540, and the fourth sign discriminator 545 may be implemented as XNOR gates.

Digitized satellite navigation signal input to the integral dump unit 230 ( ), the sample values of the sinusoidal signal, reference code, early phase code, and late phase code are updated each sampling period. The integral dump unit 230 includes a first integral dumper 570 configured to provide a first correlation value by integrating sequentially updated first output values over a predetermined period, and sequentially updated second output values. A second integral dumper 575 configured to provide a second correlation value by integrating over a predetermined period, and a third integrated dumper 575 configured to provide a third correlation value by integrating sequentially updated third output values over a predetermined period. An integral dumper 580 may be further included.

Referring to FIG. 6, examples of outputs of the first integral dumper 570, the second integral dumper 575, and the third integral dumper 580 of FIG. 5 are shown. The output of the first integral dumper 570 represents a correlation value calculated over a predetermined time period using a reference code, and the output of the second integral dumper 575 and the output of the third integral dumper 580 represents correlation values calculated over a predetermined time period using the early phase code and the late phase code, so as shown, the output of the first integral dumper 570 is the output of the second integral dumper 575. and has a larger size compared to the output of the third integral dumper 580. As shown, the output of the second integral dumper 575 and the output of the third integral dumper 580 have similar sizes, and the more similar their sizes are, the better the satellite navigation signal is being tracked.

The first integral dumper 570 may be further configured to calculate a first correlation value over a predetermined time period and display the calculated first correlation value for a subsequent predetermined time period following the predetermined time period. The second integral dumper 575 may also be further configured to calculate a second correlation value over a predetermined time period and display the calculated second correlation value for a subsequent predetermined time period following the predetermined time period. The third integral dumper 580 may also be further configured to calculate a third correlation value over a predetermined time period and display the calculated third correlation value for a subsequent predetermined time period following the predetermined time period. Referring to the examples in FIG. 6, the first integral dumper 570, the second integral dumper 575, and the third integral dumper 580 calculate the corresponding correlation values over a time period of 0 to 100 and 100. During the time period from 200 to 200, the corresponding correlation values calculated in the previous time period are displayed.

In the above description, it is exemplified that there is one early phase code and one late phase code each generated by the code generator 220, but the code generator 220 is used to generate two or more early phase codes and two or more late phase codes. ) and configuring the integral dump unit 230 to perform operations similar to the above-described operations in response to receiving two or more early phase codes and two or more late phase codes are also possible. Those skilled in the art will recognize that all of these embodiments fall within the scope of the present disclosure. In addition, in the above description, in an embodiment in which the signal tracking module 184 includes one sinusoidal signal generation unit 210, one code generation unit 220, and one integral dump unit 230 in order to track one satellite navigation signal. As an example, in order to track various types of satellite navigation signals or to track multiple satellite navigation signals at the same time, a plurality of sinusoidal signal generation units 210, code generation units 220, and integral dump units 230 are each provided. It is also possible to configure signal tracking module 184 to include. Those skilled in the art will recognize that all of these embodiments fall within the scope of the present disclosure.

The embodiments described above may be implemented with hardware components, software components, and/or a combination of hardware components and software components. For example, the devices, methods, and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, and a field programmable gate (FPGA). It may be implemented using a general-purpose computer or a special-purpose computer, such as an array, programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and software applications running on the operating system. Additionally, a processing device may access, store, manipulate, process, and generate data in response to the execution of software. For ease of understanding, a single processing device may be described as being used; however, those skilled in the art will understand that a processing device includes multiple processing elements and/or multiple types of processing elements. It can be seen that it may include. For example, a processing device may include multiple processors or one processor and one controller. Additionally, other processing configurations, such as parallel processors, are possible.

Software may include a computer program, code, instructions, or a combination of one or more of these, which may configure a processing unit to operate as desired, or may be processed independently or collectively. You can command the device. Software and/or data may be used on any type of machine, component, physical device, virtual equipment, computer storage medium or device to be interpreted by or to provide instructions or data to a processing device. , or may be permanently or temporarily embodied in a transmitted signal wave. Software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored on a computer-readable recording medium.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. A computer-readable medium may include program instructions, data files, data structures, etc., singly or in combination, and the program instructions recorded on the medium may be specially designed and constructed for the embodiment or may be known and available to those skilled in the art of computer software. It may be possible. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -Includes optical media (magneto-optical media) and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. Examples of program instructions include machine language code, such as that produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

The hardware devices described above may be configured to operate as one or multiple software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can apply various technical modifications and variations based on this. For example, the described techniques are performed in a different order than the described method, and/or components of the described system, structure, device, circuit, etc. are combined or combined in a different form than the described method, or other components are used. Alternatively, appropriate results may be achieved even if substituted or substituted by an equivalent.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the claims described below.

100: Satellite navigation signal processing system
122: Antenna
134: RF department
146: ADC
178: signal acquisition module
184: signal tracking module
210: Sinusoidal signal generator
220: Code generation unit
230: Integral dump unit
505: first encoder converter
510: second encoder converter
515: first code converter
520: second code converter
525: Third code converter
530: First sign discriminator
535: Second sign discriminator
540: Third code discriminator
545: Fourth sign discriminator
550: first multiplier
555: second multiplier
560: Third multiplier
565: fourth multiplier
570: 1st integral dumper
575: 2nd integral dumper
580: Third integral dumper

Claims (10)

A device for tracking satellite navigation signals,
a sinusoidal signal generator configured to generate a sinusoidal signal;
a code generation unit configured to generate a reference code, an early phase code, and a late phase code; and
In response to the digitized satellite navigation signal, the sinusoidal signal, the reference code, the early phase code and the late phase code, (i) over a predetermined period, the digitized satellite navigation signal, the sinusoidal signal and the reference code; (ii) a second correlation value between the digitized satellite navigation signal, the sinusoidal signal and the early phase code over the predetermined period, and (iii) the digitized satellite over the predetermined period. An integral dump unit configured to output a third correlation value between a satellite navigation signal, the sinusoidal signal, and the late phase code,
The frequency of the sinusoidal signal is the same as the frequency of the carrier wave of the digitized satellite navigation signal,
The code generator is further configured to generate the reference code, the early phase code, and the late phase code using a first integrator of N bits, where N is a natural number,
The digitized satellite navigation signal includes a code,
The reference code, the early phase code and the late phase code mimic the code of the digitized satellite navigation signal and have different phases,
Satellite navigation signal tracking device. According to paragraph 1,
The digitized satellite navigation signal is provided by sampling the analog satellite navigation signal at a sampling frequency,
The sinusoidal signal generator is further configured to generate the sinusoidal signal using the N-bit second integrator,
The N-bit second integrator operates to provide an accumulated value added by a predetermined increment value at each sampling period determined by the sampling frequency and is reset when a limit value is reached,
The generated sinusoidal signal has a phase of 0 degrees when the N-bit second integrator is reset.
Satellite navigation signal tracking device. According to paragraph 2,
The predetermined increment value is determined by the frequency of the carrier wave, the sampling frequency, and the number of bits (N) of the second integrator,
Satellite navigation signal tracking device. delete According to paragraph 1,
The digitized satellite navigation signal is provided by sampling the analog satellite navigation signal at a sampling frequency,
The N-bit first integrator operates to provide an accumulated value added by a predetermined increment value at each sampling period determined by the sampling frequency and is reset when a limit value is reached,
The generated reference code has a first state and a second state, and transitions from the first state to the second state or from the second state to the first state when the N-bit first integrator is reset, and ,
The generated late phase code has the first state and the second state, and moves from the first state to the second state or to the second state when the accumulated value of the first integrator of the N bits becomes the first value. Transitioning from the state to the first state,
The generated early phase code has the first state and the second state, and moves from the first state to the second state or to the second state when the accumulated value of the N bits of the first integrator becomes the second value. Transitioning from the state to the first state,
The second value is greater than the first value,
Satellite navigation signal tracking device. According to clause 5,
The predetermined increment value is determined by the chip rate of the digitized satellite navigation signal, the sampling frequency, and the number of bits (N) of the first integrator,
Satellite navigation signal tracking device. According to paragraph 1,
The integral dump unit,
A first encoder converter configured to convert the digitized satellite navigation signal into its magnitude and its sign and provide magnitude output and sign output;
a second encoder converter configured to convert the sinusoidal signal into its magnitude and its sign to provide magnitude output and sign output;
a first code converter configured to convert the reference code into its code and provide a code output;
a second sign converter configured to convert the early phase code into its sign and provide a sign output;
a third sign converter configured to convert the late phase code to its sign and provide a sign output;
A first sign discriminator configured to provide a first sign output in response to the sign output of the first encoder converter and the sign output of the second encoder converter,
a second sign discriminator configured to provide a second sign output in response to the first sign output and the sign output of the first sign converter;
a third sign discriminator configured to provide a third sign output in response to the first sign output and the sign output of the second sign converter;
a fourth sign discriminator configured to provide a fourth sign output in response to the first sign output and the sign output of the third sign converter;
a first multiplier configured to multiply the magnitude output of the first encoder converter and the magnitude output of the second encoder converter to provide a magnitude value;
a second multiplier configured to multiply the magnitude value and the sign indicated by the second sign output to provide a first output value;
a third multiplier configured to multiply the magnitude value and the sign indicated by the third sign output to provide a second output value, and
a fourth multiplier configured to multiply the magnitude value and the sign indicated by the fourth sign output to provide a third output value,
Satellite navigation signal tracking device. In clause 7,
The digitized satellite navigation signal is provided by sampling the analog satellite navigation signal at a sampling frequency,
The sample values of the digitized navigation signal, the sinusoidal signal, the reference code, the early phase code, and the late phase code are each updated at each sampling period determined by the sampling frequency,
The integral dump unit,
A first integral dumper configured to provide the first correlation value by integrating the sequentially updated first output values over the predetermined period,
A second integral dumper configured to provide the second correlation value by integrating the sequentially updated second output values over the predetermined period, and
Further comprising a third integral dumper configured to provide the third correlation value by integrating the sequentially updated third output values over the predetermined period,
Satellite navigation signal tracking device. According to clause 8,
The predetermined cycle corresponds to one cycle of the code,
Satellite navigation signal tracking device. According to clause 8,
the first integral dumper is further configured to provide the first correlation value during a subsequent predetermined period following the predetermined period,
the second integral dumper is further configured to provide the second correlation value during the next predetermined period,
wherein the third integral dumper is further configured to provide the third correlation value during the next predetermined period,
Satellite navigation signal tracking device.