WO2016113537A1 - Procédé de positionnement par satellite, et récepteur de positionnement par satellite - Google Patents

Procédé de positionnement par satellite, et récepteur de positionnement par satellite Download PDF

Info

Publication number
WO2016113537A1
WO2016113537A1 PCT/GB2016/000008 GB2016000008W WO2016113537A1 WO 2016113537 A1 WO2016113537 A1 WO 2016113537A1 GB 2016000008 W GB2016000008 W GB 2016000008W WO 2016113537 A1 WO2016113537 A1 WO 2016113537A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
receiver
analogue
satellite
replica
Prior art date
Application number
PCT/GB2016/000008
Other languages
English (en)
Inventor
John Ivor Rewbridge Owen
Original Assignee
The Secretary Of State For Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Secretary Of State For Defence filed Critical The Secretary Of State For Defence
Publication of WO2016113537A1 publication Critical patent/WO2016113537A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/34—Power consumption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H04B1/7085—Synchronisation aspects using a code tracking loop, e.g. a delay-locked loop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/35—Constructional details or hardware or software details of the signal processing chain
    • G01S19/37—Hardware or software details of the signal processing chain

Definitions

  • the present invention relates to satellite positioning, for example using the GPS and/or Galileo satellite networks among others and particularly to energy efficient methods of detecting and tracking signals from global navigation satellite systems.
  • the invention is of value in among other things, smartphones, portable 'sat-navs' and in military systems including drones, communication systems, radars, sensors and tracking devices.
  • the receiver receives signals from a number of satellites, to determine position and time by. accurately measuring the timing of codes included in each signal, based on data on the time of transmission of those signals and the locations of those satellites. Data for satellite ephemeris and clock parameters is encoded into the transmitted signals . Using signals from several satellites of the same and potentially different constellations it is possible to reduce the error in the determination of position and time to very small values. .
  • Fig 3 shows a generalized GPS receiver architecture. Signal is taken in at L-band and passed through phases of amplification and down-conversion at R.F., I.F. and zero I.F. frequencies. At some point in the chain, the signal has to pass through an analogue to digital interface to allow the information to be taken into a digital processor.
  • the digital processor is needed for navigation computations and signal control. As the code and carrier tracking loops are closed in software the processor would also provide the necessary feedback control signals.
  • a satellite positioning receiver receives satellites' signals and down-converts them to a digital implementation.
  • the down-conversion process involves reception by an antenna, amplification and conditioning (filtering) and mixing the received signals with a locally generated signals generated from local oscillators to Intermediate Frequencies (IF).
  • IF Intermediate Frequencies
  • the satellite signals are many dBs below the thermal noise of the receiver and the processes described here are simply to condition the received signal before the demodulation process is commenced. It is important to carefully select the down-conversion frequencies.
  • a two stage superheterodyne design is typically used to down-convert the received RF to an intermediate frequency that can be digitized.
  • the IF can be at baseband signal usually with a where the mixer has generated Inphase and Quaderature components (that is offset by 90 degrees in phase). With advances in technology direct downconvertion to near baseband is possible.
  • the signals are then digitized. When reduced to baseband Inphase and Quaderature (offset by 90 degrees in phase) the components are required to efficiently demodulate the signals.
  • Harmonics and local oscillator feedthrough that are potentially present in the mixer process must be removed through the frequency plan design, that includes the use of band pass filters at the IF and bandstop filters at the harmonic.
  • Conversion to baseband is the process of converting the IF signal to that of in-phase and quadrature components that are still modulated by the satellite Doppler. Most modern receivers do not convert to an absolute zero frequency but intentionally leave a residual offset before digitization (analogue to digital conversion).
  • the receiver In order to detect, acquire and track the signals the receiver generates two replicas of the received signals that are used in a correlation process offset by a phase different of 90 degrees, converts these to digital signals, and compares the two replica digital signals to the real digital signal.
  • the expectation is that one of the comparators will generate a strong signal (after summation over a period of time), while the other will generate a weak or zero signal (again after summation). If this is not the case, then neither of the replica signals are accurately in phase with the real signal, and the ratio of the two signals is used to adjust the timing the two replica signals, so that one of them is then accurately in phase with the real signal. In this way, using continuous negative feedback, the relevant replica signal remains constantly locked in phase with the real signal.
  • the adjustment in timing of the replica code signal is controlled by a delay lock loop to ensure the rate at which the phase of that replica signal is maintained as there is always relative motion between the satellite and receiver (Doppler shift) due to orbit motion and ahy movement of the receiver, the amount of change indicates the relative position change.
  • Satellite receiver technology has already made great advances in terms of the reduction of power required, however further advances are needed so that battery powered and portable receivers can operate for longer, or with a smaller battery.
  • the present invention aims to provide a means whereby the power consumption of satellite navigation receivers can be reduced compared with known methods.
  • a method of determining the location of a satellite navigation receiver having the steps of:
  • Each of the two Analogue Comparators is comprised in an Application Specific Integrated Circuit Radio Frequency Chip (ASIC RF Chip); and
  • the residual carrier signal is passed through an analogue to digital converter to generate a digital signal which is used in the step of determining the location of the receiver.
  • Determination of the location of the receiver using the digital signal is a process that is well known in the art and described in the literature, particularly regarding GPS recievers and is accordingly omitted for brevity.
  • a wide range of further processing steps are possible as is known in the art, such as distinguishing between reflected signals in an indoor environment, determining motion based on Doppler shift, and various known methods for obtaining an initial lock on a satellite signal.
  • the two Analogue Comparators are comprised in the same ASIC RF chip. This has the advantage that fewer components are required.
  • the step of mixing is performed using an Analogue Comparator, and preferably this third Analogue Comparator is comprised in the same ASIC RF chip as the first two Analogue Comparators.
  • there are at least 6 analogue comparators (3 satellites x 2 comparators), more preferably at least 8 (4 satellites x 2 comparators), more preferable at least 9 (3 satellites x 3 comparators), and most preferably at least .12 (4 satellites x 3 comparators). Preferably all of these are comprised in the same ASIC RF chip.
  • the receiver is further provided with two digital comparators, arranged to receive signals from three analogue-to-digital converters, in turn arranged to receive the three signals R, Fl and F2 respectively, and the receiver switches between use of the analogue comparators and the digital comparators.
  • the receiver can be switched between a normal and low power mode, for example using the low power mode only after achieving a lock on a satellite signal. I.e. the method is performed after signal acquisition process has completed, and during a position tracking process.
  • the integration time is in the range of 1 to 20 milliseconds in order that it is sufficiently long to enable the signal power to be above the noise, but sufficiently short such that any Doppler uncertainty will not corrupt the measurement. Longer integration times can also be used as is known in the art.
  • a satellite positioning receiver adapted to perform the method of any one of the preceding claims, and comprising two Analogue comparators each comprised in an ASIC.
  • a satellite positioning receiver for determining its own location comprising:
  • Two Analogue Comparators arranged to compare R and Fl and to compare R and F2 to produce CI and C2 respectively as analogue signals;
  • An analogue to digital converter arranged to receive the residual carrier signal to generate a digital signal for use by the means for determining the location of the receiver;
  • each of the two Analogue Comparators is comprised in an Application Specific Integrated Circuit Radio Frequency Chip (ASIC RF Chip).
  • ASIC RF Chip Application Specific Integrated Circuit Radio Frequency Chip
  • the receiver is provided with two digital comparators, arranged to receive signals from three analogue-to-digital converters, in turn arranged to receive the three signals R, Fl and F2 respectively, and the receiver is adapted to switch between use of the analogue comparators (e.g. to operate at a lower power consumption) and the digital comparators (e.g. to maximize signal to noise ratio).
  • the analogue comparators e.g. to operate at a lower power consumption
  • the digital comparators e.g. to maximize signal to noise ratio
  • the receiver is configured such that the analogue comparators are in use after signal acquisition process has completed, and during a position tracking process.
  • the analogue comparators are in use after signal acquisition process has completed, and during a position tracking process.
  • the satellite positioning receiver is battery powered, i.e. comprising a battery arranged to power the rest of the satellite positioning receiver.
  • the term battery encompasses fuel cells used as a substitutes for conventional solid batteries. Battery power and other sources of limited amounts of power are synergistic with the present invention which together can provide for a longer lasting or lighter weight receiver.
  • the battery is a fuel cell.
  • the satellite positioning receiver comprises an energy harvesting device.
  • the energy harvesting device may be a solar cell, a thermoelectric generator, a device adapted to generate electrical energy from acceleration or vibration or shifting of weight such as caused by the movement of a wearer of the device. More generally, preferably the receiver is powered by a portable power source and is itself portable.
  • the receiver is a portable device and comprises a graphic display.
  • the receiver is a GPS receiver, optionally it is a Galileo receiver, or optionally any other Global Navigation Satellite System or augmentation system receiver, and may be capable of switching between any or any combination of these signals (or optionally it may be capable of usingthem simultaneously).
  • the receiver may be capable of any other functionality commonly associated with satellite receivers, such as providing directions, using other sources of information or other signals to help determine position, showing a location on a map etc.
  • a satellite positioning receiver adapted to perform the method of the first aspect, and comprising three or more Analogue comparators for each reception channel all comprised in an RF ASIC.
  • ASIC RF Chip an application specific integrated circuit radio frequency chip with a bespoke and tailored design for performing the analogue comparison described above.
  • Comprised in an RF ASIC Chip means that the whole of the analogue comparator is arranged in one chip as opposed to being provided by a separately formed electronic components operating together.
  • comparators are described as being on the same chip this may mean on parallel wafers of semiconductor material within a single component that is seated (typically via pins) upon a printed circuit board alongside other components, but preferably the comparators are comprised in a single contiguous element of semiconductor material.
  • the element of semiconductor material (and the ASIC RF Chip) has the sole purpose of performing analogue comparisons at radio frequencies, but optionally it comprises further etched elements such as a digital to analog comparator, or frequency converter etc.
  • each analogue comparator is a composite analogue comparator comprising, for example, three sub-parts, each being of different sizes or gains or other parameters, for example in the ratio 1, 2 and 4 or 1, 2, 10, such that by selecting which combination of sub-parts are operated in parallel, the properties of the whole can be tuned to the required levels to a known level of accuracy, so as to compensate for variations introduced during manufacture.
  • Analogue ASIC Chips are becoming increasingly evenly manufactured and analog comparators on such Chips can be produced with less variation than in the past, this approach (or any others to compensate for variations) can advantageously be avoided.
  • To determine position in three dimensions it is necessary to either track four satellites (that must be angularly dispersed from one another from the point of view of the receiver, as well as being above the horizon) however it is also possible to use just three satellites provided that the receiver comprises an accurate clock or has access to information from one.
  • satellite signal usually at least four to accurately determine the time (Usually in addition to the location).
  • the 'location' typically includes at least location in space (generally in three spatial dimensions), optionally at least temporal location (location in time),, and includes typically both but optionally may be limited to just location in space.
  • substantially non-orthogonal is meant that the aligned replica signal is sufficiently close to being in phase or in antiphase with the real signal that mixing of them generates an acceptable output for digital conversion and further processing. This might conceivably be 45 degrees apart (i.e. so that only two replica signals are needed) but preferably these two signals are fully aligned, being either in phase or antiphase.
  • the receiver will track several signals, having multiple pairs of analogue comparators, each pair for use with a different satellite signal (and preferably at least three pairs for at least three signals). This enables the receiver to determine its position in three dimensions based on signals from three suitably spaced satellites.
  • Figure 1 illustrates the operation of a known satellite positioning receiver
  • Figure 2 illustrates the operation of a satellite positioning receiver according to a first embodiment of the present invention.
  • Figure 3 shows a circuit diagram for conversion from L-band to baseband and conversion to digital.
  • Figure 4 illustrate the operation of a satellite positioning receiver according to a second embodiment of the present invention.
  • a known satellite positioning receiver as illustrated in Figure 1 receives a real satellite signal (R) from a satellite and creates two replica signals with a frequency and waveform of that which is expected from the satellite (i.e. in the case of use with GPS, the real signal is a GPS signal, and the replica signals have wavelength and waveform according to that defined in the GPS standard).
  • R real satellite signal
  • the replica signals Preferably a signal acquisition process has already been performed as is known in the art, in which case it is possible for the replica signal to have substantially the same data at substantially the same timing as the real signal does.
  • the three signals are converted (A/D) to digital format via analogue-to-digital converters into three digital signals.
  • the real (digital) signal is compared to each of the replica (digital) signals via two digital comparators (D) to produce two digital outputs. Each of these are repeatedly summed ( ⁇ ) over a predetermined period of time , (or to produce a time average if preferred) to produce two output levels. These are compared to determine whether a preselected one of the replica signals (Fl) is in phase with the real signal (R).
  • the two replica signals out of phase preferably orthogonal, when the selected replica signal (Fl) is in phase with the real signal (R) then the output of the comparator produced from the other replica signal (F2) should be zero.
  • the timing of the replica signals (Fl, F2) can be varied in tandem so as to maintain the selected replica signal Fl in phase with the real signal.
  • the amount of variation in the timing of the predetermined replica signal is monitored (not shown) and the total net variation is indicative of the variation in distance between the receiver and satellite as is known in the art. Coupled with data on the motion of the satellite, which may be obtained periodically from data in the satellite sjgnal as is known in the art, changes in the position of the receiver can be monitored. This example is given with respect to one dimension and one satellite signal. By applying the above method to three, or more satellite signals changes in position of the receiver in three dimensions can be monitored as in known in the art. This may be output via a portable graphical display (not shown) such as a smartphone, or to a user or machine such as an autonomous vehicle.
  • figure 1 shows the two integration outputs being respectively maximized and minimized, it would be more normal to maintain them at equal levels, with the two replica signals having a phases relationship of +45 degrees and -45 degrees with respect to the real signal.
  • a satellite positioning receiver is illustrated in figure 2. Some of the processing steps shown match those in figure 1, however instead of converting the three signals (R, Fl, F2) to digital signals prior to comparison, two analogue comparators (A) are used to compare the real signal (R) with each of the replica signals (Fl, F2).
  • the analogue comparators (A) each produce an analogue comparison signal (CI, C2).
  • the comparison signals are summed ( ⁇ ) to produce two outputs (0).
  • the summation is either completed repeatedly over respective periods of time, or continually so as to produce a varying time average.
  • the two outputs are monitored, and negative feedback applied to the timing of the two replica signals (top arrow) so as to maintain a constant power relationship between them and the real signal (R).
  • a third replica signal centered between Fl and F2 is now in phase with the real signal.
  • the output of the comparison of that signal and the real signal can be converted to a digital signal (A/D) via an analogue to digital converter, and then used for further analysis of the satellite signal timing or data as is known in the art.
  • the variation in timing of the replica signals (performed as necessary to maintain them at a constant phase relationship with the real signal) is monitored. This variation is used to determine the relative motion between the satellite and receiver, which, combined with data on the motion of the satellite is used to determine the motion of the receiver in one dimension.
  • More generally four or more satellite signals may be monitored, each using the method described above and by comparing four replica signals with four real signals, then based on data on the motion of four respective suitably spaced satellites, the motion of the receiver can be determined in three dimensions and time as is well known in the art (for example the method commonly used in GPS receivers).
  • a satellite positioning receiver according to a second embodiment of the present invention is illustrated in figure 4. Many of the features are similar to those shown in figure 2 however the Comparison is performed to evaluate whether the integrated outputs 01 and 02 are equal. If they are not equal the timing of the replica signals Fl and F2 (and also F3) are adjusted to rectify this, by means of a negative feedback loop.
  • Holding 01 and 02 equal is technically more straightforward than holding one at maximum and one at zero.
  • the ratio of the two informs whether the replica signals are equally spaced either side (45 degrees phase offset) of the real signal, whether they are no longer equally spaced either side, and in which direction they have moved.
  • F3 also a comparison step
  • the (downconverted) carrier wave signal is captured with the code.
  • the first and second outputs (01 and 02) are maintained at equal power by the comparison, and the first and second replica signals are maintained with a 45 degree phase difference respectively ahead and behind the real signal.
  • the aligned replica signal preferably is a third replica signal having a phase equispaced between the first and second replica signals so as to be non-orthogonal with the real signal. This gives a comparatively strong clear signal for digital conversion and further processing according to various methods known in the art.
  • the replica signal has the same code (indeed all of them do), upon mixing the two the code remains clearly present as phase modulation upon the carrier frequency.
  • the output of the mixer preferably is converted directly to digital (rather than being first integrated) for Doppler analysis and other steps as are known in the art.
  • the correlation processor requires a minimum of two inputs - one for the received signal samples and a second for the input of the corresponding receiver-generated replica samples.
  • a third input can also be used whereby the replica samples are provided in a baseband form with the third input having a corresponding set of samples of the residual carrier replica (sine and cosine functions in the equations). This first stage of processing performs the multiplication.
  • the results of each multiplication are summed typically by an adder.
  • Such summation can be performed either in parallel or in serial format, depending upon the design performance required, or a combination of the two - parallel and serial summation.
  • DSP Digital Signal Processors
  • a digital signal processor's function is generally performed with a series of digital multipliers.
  • the received signal (after amplification, filtering, down-conversion and digitisation) is input to one of two inputs.
  • the second input to the multiplier is connected to a source of the digital representation of a replica signal (to the one sought in the received signal).
  • the replica signal contains both a representation of the spreading code and the residual intermediate frequency. This implies that the replica is formed through the process of multiplication of the baseband spreading code and an in-phase and/or quadrature digital representation of the residual intermediate frequency carrier.
  • a known alternative is that the two multipliers processes the signal one after the other in a serial arrangement.
  • An alternative circuit is based on the use of the known Gilbert cell. The Gilbert cell is able to perform in either analogue or digital modes using either small signal or saturated signal modes.
  • the addition function associated with the correlation process has been exclusively performed by digital signal processing using, for example, up-down counters, adder networks or logic arrays.
  • the complexity of the DSP networks is significant and generally not required for the received noise level.
  • Prior art receivers have mitigated the width of the representation by circuits which reduce the number of bits in the representation (say to 15) prior to further processing. Such circuits are often adaptable to the signal and noise levels so that no significant precision is lost.
  • the alternative means of performing the summation proposed is the use of analogue techniques whereby the currents from each output of the enhanced Gilbert cells (EGC) are added together in a current summing junction.
  • EGC enhanced Gilbert cells
  • Such circuitry does not have the precision of DSP. The precision is limited by the variation of the value of the tail current in each EGC. The variations would be difficult to control in discrete component implementations of the circuitry. This is not the case for integrated circuit fabrications where the current variations can be maintained to within a band of 1% width. In this case the current variations appear as an additive noise to the signal, replica and intermediate frequency product. The circuit noise is reduced through the process of averaging so that, in practice, the additional circuit noise is not a significant factor.

Abstract

L'invention concerne un procédé de surveillance de position par satellite, dans lequel des signaux de réplique (Fl, F2, F3) sont comparés à un signal de satellite (R) à l'aide de comparateurs analogiques (A), et les comparateurs analogiques sont disposés dans un microcircuit intégré radiofréquence spécifique d'une application (Puce RF ASIC).
PCT/GB2016/000008 2015-01-16 2016-01-15 Procédé de positionnement par satellite, et récepteur de positionnement par satellite WO2016113537A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1500723.0 2015-01-16
GBGB1500723.0A GB201500723D0 (en) 2015-01-16 2015-01-16 A method of satellite positioning and a satellite positioning receiver

Publications (1)

Publication Number Publication Date
WO2016113537A1 true WO2016113537A1 (fr) 2016-07-21

Family

ID=52630682

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2016/000008 WO2016113537A1 (fr) 2015-01-16 2016-01-15 Procédé de positionnement par satellite, et récepteur de positionnement par satellite

Country Status (2)

Country Link
GB (2) GB201500723D0 (fr)
WO (1) WO2016113537A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738914A (zh) * 2018-12-14 2019-05-10 湖南卫导信息科技有限公司 应用于隧道内导航仿真系统的本地时钟频率偏差修正方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029181A (en) * 1989-07-17 1991-07-02 Kyocera Corporation Automatic calibration device for direct spectrum spread receiver
WO2000014892A1 (fr) * 1998-09-08 2000-03-16 University Of Hawaii Correlateur analogique a temps continu et spectre etale, et procede le concernant
WO2001039698A1 (fr) * 1999-12-01 2001-06-07 Board Of Trustees Of The Leland Stanford Junior University Procede de reduction d'erreurs de recherche de trajets multiples pour recepteurs a spectre etale
WO2009014810A2 (fr) * 2007-06-02 2009-01-29 Inchul Kang Système et procédé d'acquisition de signal gps

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5936571A (en) * 1997-01-31 1999-08-10 Lockheed Martin Corporation Integrated GPS/interference location system
US7164736B2 (en) * 2001-06-22 2007-01-16 Sirf Technology, Inc. Synthesizing coherent correlation sums at one or multiple carrier frequencies using correlation sums calculated at a course set of frequencies
US8334804B2 (en) * 2009-09-04 2012-12-18 Hemisphere Gps Llc Multi-frequency GNSS receiver baseband DSP

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5029181A (en) * 1989-07-17 1991-07-02 Kyocera Corporation Automatic calibration device for direct spectrum spread receiver
WO2000014892A1 (fr) * 1998-09-08 2000-03-16 University Of Hawaii Correlateur analogique a temps continu et spectre etale, et procede le concernant
WO2001039698A1 (fr) * 1999-12-01 2001-06-07 Board Of Trustees Of The Leland Stanford Junior University Procede de reduction d'erreurs de recherche de trajets multiples pour recepteurs a spectre etale
WO2009014810A2 (fr) * 2007-06-02 2009-01-29 Inchul Kang Système et procédé d'acquisition de signal gps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KAPLAN ELLIOT D.: "Understanding GPS: principles and applications - 2nd edition", 2006, ARTECH HOUSE, Boston London, ISBN: 978-1-58053-894-7, article WARD PHILLIP W.: "Chapter 5: Satellite signal acquisition, tracking, and data demodulation", pages: 153 - 179, XP002755785 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738914A (zh) * 2018-12-14 2019-05-10 湖南卫导信息科技有限公司 应用于隧道内导航仿真系统的本地时钟频率偏差修正方法

Also Published As

Publication number Publication date
GB201600678D0 (en) 2016-03-02
GB201500723D0 (en) 2015-03-04
GB2536111A (en) 2016-09-07

Similar Documents

Publication Publication Date Title
US8964813B2 (en) Receiver of binary offset carrier (BOC) modulated signals
US6363123B1 (en) Receiver calibration technique for global orbiting navigation satellite system (GLONASS)
US7555033B2 (en) Binary offset carrier M-code envelope detector
US10324193B2 (en) Device for tracking a satellite radionavigation signal in a multipath environment
US9515697B2 (en) Scanning correlator for global navigation satellite system signal tracking
US10859709B2 (en) Satellite navigation receiver with fixed point sigma rho filter
US8144752B2 (en) Method and device for receiving a BOC modulation radio-navigation signal
EP3182606B1 (fr) Suppression au moyen de seuillage de schéma
JP2009258107A (ja) Ｇｎｓｓ信号を高速に取得するためのシステムおよび方法
EP3362818B1 (fr) Récepteur de navigation par satellite avec filtre rho sigma à virgule fixe
US20140077992A1 (en) Gnss system and method using unbiased code phase tracking with interleaved pseudo-random code
WO2016113537A1 (fr) Procédé de positionnement par satellite, et récepteur de positionnement par satellite
US9453918B2 (en) Apparatus and method for processing radio navigation signals
Jianfeng et al. Low C/N0 carrier tracking loop based on optimal estimation algorithm in GPS software receivers
Lopes et al. Ionospheric Scintillation Mitigation with Kalman PLLs Employing Radial Basis Function Networks
Dionisio et al. gLab a fully software tool to generate, process and analyze GNSS signals
Otaegui et al. Real time fast acquisition based on hardware FFT for a GPS/EGNOS receiver
JP5126527B2 (ja) 測位信号追尾処理装置および測位装置
WO2006092641A1 (fr) Acquisition d'un signal de liaison de retour sans fil soumis a une derive de frequence doppler
Miyano et al. Development of a miniature multifunctional GPS receiver for space applications
Mao et al. Bandwidth optimization of carrier/code tracking loops in GPS receiver
Sun GNSS code tracking in presence of data
Martínez Rodríguez-Osorio et al. Design and Validation of a Software Receiver for Galileo
Sin et al. Performance Verification on the GPS/Galileo Combined Receiver for GNSS Sensor Station

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16701062

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16701062

Country of ref document: EP

Kind code of ref document: A1