Method of providing mobile station of satellite positioning system with auxiliary data

FIELD: information technology.

SUBSTANCE: request for auxiliary data issued by a mobile station is received at a server station and in response to the request, the server station sends to the server station ephemeral data as part of auxiliary data. After receiving the request for auxiliary data issued by the mobile station, the server station decides on the possibility of the mobile station reaching given accuracy for determining location is provided with transmitted ephemeral data. In the affirmative case, the server station sends transmitted ephemeral data to the mobile station. In the negative case, the server station sends to the mobile station long-term ephemeral data instead of transmitted ephemeral data as part of the requested auxiliary data. The long-term ephemeral data are extracted from forecasts of orbit satellites and they have validity interval which is sufficiently long compared to the ephemeral data transmitted by satellites.

EFFECT: high accuracy of position finding.

8 cl, 3 dwg

 

The technical field

Considering the invention relates mainly to the positioning means of satellite positioning system, in particular, to a method of providing a mobile station auxiliary data, enabling determination of its location.

The level of technology

Receivers GNSS (Global Navigation Satellite System - global satellite navigation system) determine the range of up orbiting Earth satellites to determine its geographic location. If the distance from the receiver to the satellites and the location of the satellites are known, the location of the receiver can be calculated. Since the location of the satellites in the changes over time, the receiver requires a description of their orbits, depending on time. As a rough calculation, we can assume that the error in the 100 m at the location of the satellite leads to an error of approximately 25 m at a particular receiver location. Therefore, each satellite in the composition of the transmitted signal passes as a description of its orbit ephemeris data. Standalone receiver must demodulate these ephemeris data transmitted from the satellites signals to determine their (satellites) location.

Philosophy, which is based AGNSS (Assisted GNSS - global satellite navigation system with external p is the support), involves the transfer of some functions that must be performed to determine the location on the server node that communicates with a mobile station via a communication network, for example via a cellular network. If one should determine the location of the mobile station, the mobile station sends to the server a request node auxiliary data. In response to this request, the server node transmits the mobile station auxiliary data. The mobile station may be requested various types of auxiliary data, for example, control location, control time, the navigation model, ionospheric correction, differential correction, almanacs (annual calendar with astronomical statistical information), etc. After receiving from the server node auxiliary data to mobile station then processes the satellite signal, for example, carries out the detection of the satellite and/or calculate the pseudorange. Currently, there are two possibilities to calculate location: or mobile station performs the necessary calculations itself (MS-based mode), or the mobile station transmits the pseudorange on the server node, which computes the location and then sends it to the mobile station (MS-assisted mode).

It should be noted that in the field of GNSS make the difference between satellite orbits of the satellite and the two types of data, used for presentation, i.e. the "ephemeris data", provides an accurate description of satellite orbits and almanac, giving a less accurate description of satellite orbits. The almanac data is not accurate enough to determine the exact location that meets the system technical requirements or expectations of the end user (usually up to a few tens of meters). The mobile station receiving ephemeris data through the cellular network, has the advantage of being expressed in the absence of the need to demodulate the ephemeris data, which is part of the so-called "navigation message"contained in the broadcast by the satellites signal distribution in space (signal-in-space, or SIS). Compared to GNSS without external support that leads, ultimately, to facilitating the positioning, i.e. to reduce the time to determine and/or decrease the threshold value of the receiver sensitivity (in terms of signal intensity).

Some ways to support these mobile stations use high-level layers of communication networks, i.e. applicative layers (application layers). The advantage of this solution is that applicative layers have much higher data rate compared with layers of level control is based (control plane). Despite this, the user can get access to this layer only if it has a subscription (i.e. subscriber access) to this layer, which increases the priority of the request positioning in relation to emergency calls. Therefore, it would be preferable to move the auxiliary data to the mobile station and the delivery of the location information from the mobile station over the layer management communication network. The Protocol is standardized in TS44.031 (RRLP) for GSM and TS23.371 (RRC) for UMTS. An important advantage of the implementation of the management level is the fact that the exchange of data relating to the location, is possible even without a SIM (Subscriber Identity Card) card. As a result, an emergency call can be defined on the ground even in the case where the user has no subscription access. Another advantage is that the operator controls the process and can vouch for the provision of services. The main disadvantage is that the signal layers have a low data rate, which leads to problems in the case of a request ancillary data many mobile stations. So look for ways of sharing GNSS auxiliary data with a reduced bit rate.

This method is described in US 6,058,338. Server location transmits almanac long period of reliability (n is an example, week) for a mobile station that stores the data. Upon receiving the request, the auxiliary data server instead of sending transmits ephemeris data vector correction corresponding to the difference between the current ephemeris data and the current almanac, which are received from the satellites in real-time. Effect of long-term applicability of the almanac this data does not require frequent retransmissions. Because send only difference vectors may be used in a smaller number of bits than would be required to send ephemeris data in the form in which they are broadcast by the satellites.

Not covered in the above document, the problem with the "roaming", i.e. request the mobile station auxiliary data in the event of its location in the geographical area in which there is no coverage of its home operator. Due to the fact that the server node sends broadcast by the satellites of the navigation data may be situation in which visible mobile station satellites are not visible to the GNSS receiver server node and in which the applicability of the last stored on the server node ephemeris data for the respective satellites ceased to be in force. A known solution to this problem is the placement of stationary control GNSS receivers located around the globe and the United States with the server node. Currently, the operator has the opportunity to build a network that is very expensive, or enter into a contract with the owner of such a control network, which makes it dependent on the other party.

In this context, the satellite is understood as "visible" to a certain geographical point, if it is above the horizon line in relation to this point.

US 2004/0117114 A1 and interrelated US 2002/0190898 A1 US and 2002/0188403 A1 describe the use of the remote receiver long-term satellite route data instead of broadcast satellites ephemeris data. After a request by the remote receiver auxiliary data server transmits the satellite route data obtained by projections of satellite orbits having a period of validity up to four days.

The object of the invention

The object under consideration of the invention to provide an improved method for providing mobile station auxiliary data. This object is achieved claimed in claim 1 way.

Meta description of the invention

The satellites of the satellite positioning system emit as part of the navigation signals having a certain period of applicability of the ephemeris data. The period of validity may be defined as the length of time during which derived from these efem the native data, the accuracy of the positioning meets the technical requirements and accordingly, the expectations of the end user. In the mobile station, such as mobile phone, digital camera, laptop computer, pocket personal computer or any similar device, equipped with a receiver of a satellite positioning, ephemeris data required for positioning. In satellite positioning with external support receiving emitted by the satellites of the navigation signals is facilitated, since the mobile station supply auxiliary data. Server station, for example AGNSS server or any similar provider of auxiliary data, receives broadcast by the satellites ephemeris data, for example, by using connected with it control of the receiver. Request assistance data from the mobile station get on the server station, which then in response to the request, transmits to the mobile station ephemeris data as part of the ancillary data. In accordance with an important aspect of the invention, after receiving the request assistance data from the mobile station, the server station decides on the possibility of reaching a mobile station specified accuracy of the positioning in the case of supply of broadcast ephemeris data. In the positive case, i.e. if the specified accuracy of the locality is of an unforgettable can be achieved with broadcast ephemeris data, the server station transmits broadcast ephemeris data to the mobile station. In the negative case, i.e. if only given the accuracy of positioning can be achieved with broadcast ephemeris data server station transmits to the mobile station instead of the broadcast ephemeris data long-term ephemeris data as part of the requested assistance data. Long-term ephemeris data extracted from forecasts satellites orbits, and they have a period of validity significantly greater compared to the broadcast by the satellites ephemeris data.

Mainly step decision-making remains simple. He may, for example, to include an evaluation of the applicability in time request received by server station broadcast ephemeris data.

As will become clear hereinafter, the method reduces the bandwidth of the communication channel between the server and the mobile stations as a result of taking into account whether the transfer of broadcast ephemeris data or long-term ephemeris data. In fact, the update is stored in the mobile stations ephemeris data become less frequent. This leads to a practical lower bandwidth because the total size of the long-term ephemeris data does not exceed the size of ycnih ephemeris data. On the other hand, it increases the autonomy of the receiver, i.e. the period during which the receiver does not require additional supporting data. Preferably the period of applicability of the long-term ephemeris data is increased at least 1.5 times, more preferably at least 2 times and more preferably 4 times compared to conventional ephemeris data.

Preferably the format of the long-term ephemeris data matches the format of broadcast ephemeris data and is compatible with existing standards.

The device of the forecast of external orbits can provide the server station forecasts satellite orbit, which then extracts the long-term ephemeris data. Alternative or additional server station can extract the projections of the orbits, using as input broadcast ephemeris data received at the server station, for example, by means of the corresponding connected with a server station satellite receiver. In any case forecasts satellite orbit preferably based on mechanical models acting on the satellites forces. Projections of the orbit can be obtained by integrating the fundamental laws of mechanics, using as initial values of the known parameters of the satellite.

what if the server station is equipped with a GNSS receiver, it can receive and store broadcast by the satellites ephemeris data over time, while the satellites are visible from the location of the receiver. If the satellite disappears beyond the horizon, the server station can calculate the orbit of the satellite, based on the stored ephemeris data. The specialist will note that this greatly reduces the problem of "roaming". Suppose, for example, that the server station and its control receiver is located in Europe, while the mobile station is requesting assistance data for Australia. In this quote for example and not imposing limits illustrated in the case of controlling the receiver does not provide the server station current ephemeris data of the satellites, i.e., those satellites that can not at the same time to be used for navigation in Australia. Then the server station can calculate the long-term projections of the orbits of these satellites, based on the most recent, founded in memory of ephemeris data. It should be noted that in this case, the period of time between the most recent ephemeris data and time of query are included in the period in respect of which spend forecast orbit. Then these predictions are used to get the current long-term ephemeris data. Unlike known systems, the server station must not everyday life is connected to the control network receivers dispersed around the globe. The only control the receiver may be sufficient if it is placed in a suitable geographical location. The necessity to control the receiver in the same geographical area as the server station, is missing.

In addition to the ephemeris data transmitted to the mobile station auxiliary data may contain optional data ionospheric refraction and/or data synchronization. Type in the required data can be specified mobile station to request ancillary data. Data ionospheric refraction or synchronization data can further reduce the duration of your location or to improve the accuracy of the calculated location. In a particularly preferred embodiment, the server station together with request assistance data receives the initial assumption about the location of the mobile station, for example, information about a cell of a communication network in which the mobile station is located. Then the server station can optimize auxiliary data in accordance with the original location. Optimization for a particular location can be achieved in relation to the efficient bandwidth of the communication channel between the mobile and server stations. For example, send to Moby Inoi station overmarine data can be reduced to the ephemeris data of only those satellites, currently visible from the cell network connection. Transmitted to the mobile station data ionospheric refraction can be reduced to data ionospheric refraction to a specific location.

Brief description of figures

The following describes preferred, cited as an example, an embodiment of the invention with reference to the accompanying figures, of which:

Figure 1 - block diagram of the components of the communication network that uses satellite positioning system to determine location of the mobile station;

Figure 2 is a high-level block diagram of a method of providing auxiliary data of the mobile station satellite positioning system according to a preferred variant embodiment of the invention;

Figure 3 - illustration of the chronological events that occur before and, respectively, after the auxiliary request data.

Description of the preferred option implementation

Figure 1 shows the components of communication system 10 that uses a satellite positioning system (such as, for example, GPS, GLONASS, Galileo, or a combination). The communication system 10 includes a fixed infrastructure such as base transceiver stations 12, 14, 16 and mobile station 18, such as shown in figure 1 mobile phone. Fixed infrastructure also includes the t in the controller 20 of the base station (KBS), serving mobile location center 22 (OMC) and AGNSS server 24. Fixed infrastructure typically connects the mobile station 18 with terrestrial communications networks and/or Internet.

AGNSS server is connected to the control GNSS receiver 26, which receives ephemeris data broadcast GNSS satellites 28, 30, 32, visible from the location of the control receiver 26. The relationship between control receiver 26 and AGNSS server 24 may be based on Internet Protocol or any other suitable Protocol. The server 24 receives broadcast ephemeris data through the link 34 from the control receiver 26 and stores them in memory. Broadcast ephemeris data, for example, the period of applicability of about 3 hours from the time of their referral. Outside the period of applicability of the differences between broadcast ephemeris data and actual orbits of the satellite substantially increased so that the specified accuracy of the positioning of the user cannot be achieved using these ephemeris data.

Positioning may be initiated by a user of the mobile station 18 intentionally or automatically, for example, in response to the start connected with countryside view information on his mobile station. An alternative location can be initiated is ANO external application, for example, in response to sent the user a message asking for help. In the first step, the auxiliary request data is sent to the mobile station and sent to the AGNSS server 24. The requested auxiliary data can be selected from a standardized set of technical specifications 3GPP TS 44.031, issued on 3rdGeneration Partnership Project. This set contains among other things the control location (tentative location is obtained, usually from the cell information), the control time (to synchronize the mobile station with GNSS time), the navigation model (peremeny data), ionospheric correction, almanacs, etc. Then AGNSS server 24 clarifies the requested supporting data, which are transmitted to the mobile station. The mobile station uses the received auxiliary information for obtaining broadcast by the satellites signals and performs the measurement of the pseudorange. Details of this operation are well known to the specialists in the field of AGNSS. The location can be calculated or in MS-based mode or in an MS-assisted mode depending on the configuration of the mobile station 18.

Figure 2 represents the steps performed to finalize peremeny data for the mobile station 18 according to a preferred variant implementation of the invention. Issued by the mobile station 18 request sun is magatelli data take on the AGNSS server 24 (step 201). In the present example, assume that a user requests ephemeris data. The request also contains information, for example, provided OMC 22, network sauté 35 relating to the current location of the mobile station 18. On the basis of the information including, for example, cell information, information almanac and information about the current time, AGNSS server 24 determines which satellites may be visible from the location of the user (step 202).

Then, the server 24 retrieves from memory the most recent ephemeris data transmitted by these satellites and received at the control receiver 26, and assesses the ability of the mobile station 18 to determine the location with a given accuracy (e.g., 40 m), assuming that the mobile station 18 would be able to use the broadcast ephemeris data (step 203). The assessment may be based on a simple heuristic statement that the broadcast ephemeris data of each satellite can not be used while not included in the period of applicability of the broadcast ephemeris data.

If the ephemeris data in the memory is fresh, they can be sent to mobile station 18 as part of the ancillary data. Such a case may, for example, occur if at query time, the user is in the same geographical area is, as control receiver 26 connected to the AGNSS server. In step 204 ephemeris data ready for transmission in the mobile station.

If stored in the memory of the most recent ephemeris data are no longer valid, or if, for example, the intensity of the exchange of information in the communication channel between the AGNSS server 24 and the mobile station 18 is high enough, is calculated (in step 205), and prepare for transfer to the mobile station (step 206) long-term ephemeris data.

After ephemeris data were prepared for transmission with the auxiliary data, for example, by formatting the ephemeris data in RINEX format, they are transmitted to the mobile station 18 (step 207).

In the described embodiment, there are two possibilities provide long-term ephemeris data.

The server 24 is connected to the device 36 forecast external orbit. In the case of Galileo system, this feature can be attributed to the so-called Orbit and Synchronisation Processing facility (processing device of the orbit and synchronization - EPA). The device 36 forecast orbit can send AGNNS server 24 projections of the orbit or even long-term ephemeris data obtained from projections of the orbits.

Additionally, the server 24 stores the history of the location and speed of the satellite as long as it takes ephemeris given the s from the satellite via the control receiver 26. These data are used as input for the extrapolation of the satellite's orbit by means of a mechanical model, taking into account applicable to the satellite strength. The concept of orbit prediction based on the integration of the fundamental laws of mechanics with known locations and velocities of the satellites as the initial values. The prediction of the orbit may take into account the earth, moon and sun's gravity, the Earth's rotation around the pole, the rotation of the Earth relative to the stars, precession and nutation, solar pressure, tides, etc. Satellite orbits are projected for the period that substantially exceeds the period of applicability of the broadcast ephemeris data used as input. Depending on the used algorithm for the prediction of orbits they can be predicted for 24 hours or longer. The predicted orbits are used to obtain long-term ephemeris data.

It should be noted that the device 36 forecast external orbits can calculate the orbit and/or long-term ephemeris data with the same or similar way as described for the server 24. Internal and external orbit and/or ephemeris calculations can be used duplicated (redundant with respect to each other, i.e. one serves as a backup for the other in case the AE failure, or they complement each other. In particular, the latter can be interesting when the AGNSS server should work with different systems of satellites, such as GPS and Galileo. For Galileo, the device 16 forecast planned orbit, while for GPS - no. Ephemeris data for the GPS satellites could be calculated by the server 24 independently, while the ephemeris data for satellites Galileo could be provided to EPA.

Figure 3 shows the course of events on the timeline. The passing of time is represented from left to right along the axis 38. AGNSS server receives ephemeris data broadcast single satellite at different points in time, Th-2, Th-1, Th-0 (Th denotes the time of ephemeris - time ephemeris). In time ToR (query time) AGNSS server receives a request ephemeris data for that specific satellite. The last ephemeris data of the satellite relative to the time ToR were obtained at time Th-0. Figure 3 illustrates the case in which the request is after the applicability of the most recent data has expired: period 40 the applicability of these ephemeris data has expired earlier point in time ToR at time TE. In time ToR AGNSS server provides a forecast of the orbit for the time interval 42, which includes the time ToR. Forecast Orby the s starts at time, for which the location and velocity of the satellites is known, i.e. to THOSE. Long-term ephemeris data is obtained from the prediction of the orbit for the time interval 44, which has a substantially greater duration than the period of applicability of the broadcast ephemeris data, and which contains, preferably at the beginning of the time interval 44, the time ToR.

It should be noted that the projections of the orbit can be performed in response to a specific request of the mobile station. Alternative projections of the orbit can be constantly updated in memory and be available upon request the mobile station to retrieve long-term ephemeris data.

1. The method of providing auxiliary data to the mobile station for assistance in obtaining the signals emitted by the satellites of the satellite positioning system, and the data signals of the satellites broadcast with a specific period of validity of the ephemeris data, namely, that:
on the server station receives from the mobile station a request to the helper data,
on the server stations receive the broadcast ephemeris data,
on the server station decide on the possibility of reaching a mobile station specified accuracy of the positioning in the case of providing the above-mentioned broadcast ephemere the governmental data,
in the positive case - transmit broadcast ephemeris data to the mobile station, or
in the negative case, in response to a request to transmit to the mobile station as part of the auxiliary data long-term ephemeris data having a period of validity, significantly greater compared with the above-mentioned broadcast by the satellites ephemeris data, and derived from forecasts of satellite orbits.

2. The method according to claim 1, wherein the step of deciding includes determining the application at the time of the request received by a server station broadcast ephemeris data.

3. The method according to claim 2, in which at least part of the projections satellite orbits obtained at the server station of the device of the forecast external orbit.

4. The method according to claim 1, in which the predictions of satellite orbits based on mechanical models acting on the satellites forces.

5. The method according to claim 1, in which the predictions of satellite orbits obtained using the broadcast ephemeris data received at the server station as input.

6. The method according to claim 1, wherein as part of the auxiliary data transmit data on ionospheric refraction and/or data synchronization.

7. The method according to claim 1, in which together with request assistance data receive initial assumption about the location of mobile stations and optimize auxiliary data in accordance with the initial assumption.

8. The method according to any one of claims 1 to 7, in which the satellite positioning system includes a GPS and/or GLONASS and/or Galileo.



 

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