Multi-antenna-GNSS receiver-system to raise the probability of line of sight

• US 10,690,777 B2
• Filed: 07/30/2015
• Issued: 06/23/2020
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Original Assignee: Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forsching E.V.
• Inventors: Overbeck, Matthias
• Primary Examiner(s): Liu, Harry K
• Application Number:
  US14/813,296
• Publication Number:
  US 20160033648A1
• Time in Patent Office: 1,790 Days
• Field of Search: 34235725
• CPC Class Codes: G01S 19/072 Ionosphere corrections
• CPC Class Codes: G01S 19/24 Acquisition or tracking or demodulation of signals transmitted by the system synchronisation aspects of direct sequence spread spectrum modulation H04B1/7073
• CPC Class Codes: G01S 19/35 Constructional details or hardware or software details of the signal processing chain
• CPC Class Codes: G01S 19/42 Determining position
• CPC Class Codes: G01S 19/421 by combining or switching between position solutions or signals derived from different satellite radio beacon positioning systems; by combining or switching between position solutions or signals derived from different modes of operation in a single system

Abstract

A system having two or more antenna-receiver combinations is provided, wherein each of the two or more antenna-receiver combinations has an antenna and a receiver. Furthermore, the system has a position determiner for determining a position of the system. Each antenna-receiver combination is configured to receive time information from each satellite of three or more satellites, if the antenna of said antenna-receiver combination has a line of sight to said satellite. The position determiner is configured to determine said position of the system depending on a satellite position of each of the three or more satellites, and depending on the time information from each of the three or more satellites provided by one or more of the two or more antenna-receiver combinations, if, for each of the three or more satellites, the position determiner receives time information of said satellite from at least one of the two or more antenna-receiver combinations.

Claims

1. A system comprising:

two or more antenna-receiver combinations, wherein each of the two or more antenna-receiver combinations includes an antenna and a receiver, the receivers of the two or more antenna-receiver combinations being phase stable synchronized by a base reference clock, and

a position determiner that determines a position of the system, wherein

each antenna-receiver combination of the two or more antenna-receiver combinations is configured to determine a time of reception of time information from each satellite of the three or more satellites if the antenna of each of the two or more antenna-receiver combinations has a line of sight to each of the three or more satellites, and

the position determiner is configured to determine the position of the system if, for each of the three or more satellites, the position determiner receives the time information from each satellite from at least one of the two or more antenna-receiver combinations, depending on (i) a satellite position of each of the three or more satellites, (ii) how the antennas of the two or more antenna-receiver combinations are arranged in a predetermined geometry, (iii) the time information from each of the three or more satellites received by the at least one of the two or more antenna-receiver combinations, (iv) the time of reception of the time information from the satellite by the position determiner, and (v) the orientation of the system, the orientation depending on how the antennas are arranged in the system and how an arrangement of the antennas is oriented with respect to a reference.

2. The system according to claim 1, wherein a distance between each pair of antennas of the antennas of the two or more antenna-receiver combinations is greater than 50 centimeters.

3. The system according to claim 1, wherein the system comprises at least three antenna-receiver combinations.

4. The system according to claim 1, wherein each antenna-receiver combination of the two or more antenna-receiver combinations is configured to receive time information from each satellite of four or more satellites, if the one antenna of said antenna-receiver combination has the line of sight to said satellite.

5. The system according to claim 1, wherein the position determiner is configured to determine the position of the system by selecting, for each satellite of the three or more satellites, if at least two of the two or more antenna-receiver combinations provide time information to the position determiner, the time information provided by one of the at least two of the two or more antenna-receiver combinations to the position determiner that was included within a received satellite signal having a greatest signal energy among all received satellite signals which include the time information from each satellite received by the receivers of the two or more antenna-receiver combinations.

6. The system according to claim 1, wherein the position determiner is configured to determine said position of the system depending on a reception time of the time information of each of the three or more satellites received by one or more of the two or more antenna-receiver combinations, wherein said reception time indicates when said time information was received by said antenna-receiver combination or when said time information was received by the position determiner from said antenna-receiver combination.

7. The system according to claim 6, wherein the position determiner is configured to determine said position of the system without correcting the reception time of the time information of each of the three or more satellites received by one or more of the two or more antenna-receiver combinations.

8. The system according to claim 6, wherein the position determiner is configured to determine said position of the system by correcting a reception time of the time information of each of the three or more satellites received by one or more of the two or more antenna-receiver combinations.

9. The system according to claim 8, wherein the position determiner is configured to correct said reception time of the time information of each of the three or more satellites received by said one or more of the two or more antenna-receiver combinations by using a geometry between the antennas of the two or more antenna-receiver combinations, or by using the antennas of the two or more antenna-receiver combinations with a position fix, or by using additionally an inertial navigation system and magnetic field sensors.

10. The system according to claim 1, wherein the receiver of each antenna-receiver combination of the two or more antenna-receiver combinations is configured to provide information about tracking parameters for carrier and code loops for one or more satellites of the three or more satellites to at least one other antenna-receiver combination of the two or more antenna-receiver combinations.

11. The system according to claim 10,

wherein the position of the system which is to be determined by the position determiner is a system position,

wherein the receiver of said antenna-receiver combination is configured to transform said information about the tracking parameters for the carrier and the code loops for said one or more satellites geometrically to an antenna position of the antenna of said at least one other antenna-receiver combination, and

wherein the receivers of said at least one other antenna-receiver combination are configured to use said information about the tracking parameters for the carrier and the code loops for a deep coupling of the tracking loops of said receiver of said at least one other antenna-receiver combination.

12. A motor vehicle, comprising the system according to claim 1.

13. The motor vehicle according to claim 12, wherein the motor vehicle is a harvester.

14. A method, wherein each of two or more antenna-receiver combinations includes an antenna and a receiver, and the receivers of the two or more antenna-receiver combinations being phase stable synchronized by a base reference clock, comprising:

determining a time of reception of time information from each satellite of three or more satellites by each antenna-receiver combination of the two or more antenna-receiver combinations, if the antenna of each of the two or more antenna-receiver combinations has a line of sight to each of the three or more satellites, and

determining a position of the system by a position determiner, if, for each of the three or more satellites, the position determiner receives the time information of each satellite from at least one of the two or more antenna-receiver combinations, depending on (i) a satellite position of each of the three or more satellites, (ii) how the antennas of the two or more antenna-receiver combinations are arranged in a predetermined geometry, (iii) the time information from each of the three or more satellites provided by the one of the two or more antenna-receiver combinations, (iv) the time of reception of the time information from the satellite by the position determiner, and (v) the orientation of the system, the orientation depending on how the antennas are arranged in the system and how an arrangement of the antennas is oriented with respect to a reference.

15. A non-transitory computer readable medium including a computer program for implementing the method of claim 14 when being executed on a computer or signal processor.