公开(公告)号：US3573818A

公开(公告)日：1971-04-06

申请号：US3573818D

申请日：1968-08-15

Applicant: SIERRA RESEARCH CORP

Inventor： LENNON WILLIAM TOBIN JR ,  JOHNSON ALLEN BURDELL ,  MICHNIK LEWIS

IPC: B64D45/00 ,  G01S11/08 ,  G01S9/56

CPC classification number: G01S11/08 ,  G05D1/104

Abstract: A stationkeeping system for maintaining the positions of aircraft operating in a follower mode with respect to other nearby aircraft which may be designated to operate in a leader mode, all aircraft having accurately synchronized time clocks, and the aircraft transmitting pulse groups during their own time slots, marking their positions and also telemetering other encoded data such as altitude and intended maneuvers. Each follower aircraft receives all such transmissions during time slots in which they were transmitted by other aircraft, and selects a particular slot belonging to an aircraft which it chooses to follow. It processes the received data and displays it by a cluster of instruments showing spacing relative to the selected aircraft both in the direction of flight, and transversely thereof, as well as differential altitude and intended maneuvers, such instruments including means for entering offsets defining relative positions which it is desirable for the follower to maintain.

公开(公告)号：US3568186A

公开(公告)日：1971-03-02

申请号：US3568186D

申请日：1968-12-03

Applicant: BENDIX CORP

Inventor： SHEAR WAYNE G ,  OLMSTEAD MERLIN E ,  EVERETT SAMUEL ROGER

IPC: G01S11/08 ,  G01S19/14 ,  G01S19/49 ,  G08G5/04 ,  G01S9/56

CPC classification number: G01S11/08

Abstract: Apparatus for synchronizing clocks within a cooperative collision avoidance network wherein an aircraft after operating in an isolated environment for a predetermined time sets its clock in a standby position and listens for start of epoch signals. Upon hearing a start of epoch signal the aircraft immediately starts its clock and begins counting epochs and the time slots contained therein. During own time slot, as determined by its clock, the aircraft transmits a clock synchronization request. If no synchronization responses are received the aircraft will automatically advance its clock by a predetermined amount and once again transmit a synchronization request during its next time slot. If a synchronization response is now received the aircraft will synchronize its clock taking into account the amount of time by which its clock had to be advanced in order to receive the synchronization response. If no response is received the aircraft automatically returns its clock to the standby condition.

公开(公告)号：US3566404A

公开(公告)日：1971-02-23

申请号：US3566404D

申请日：1968-12-16

Applicant: TRW INC

Inventor： SORKIN MORRIS

IPC: G01S11/08 ,  G01S19/04 ,  G01S9/04 ,  G01S9/56

CPC classification number: G01S11/08

Abstract: A METHOD OF AN APPARATUS FOR AVOIDING COLLISIONS BETWEEN VEHICLES, PARTICULARLY SUITED FOR THE CONTROL AIRCRAFT, UTILIZING TIME SHARING TECHNIQUES AND BEING SYNCHRONIZED BY SATELLITE EMITTED SIGNALS. EACH SATELLITE SIGNAL INITIATES A TIME CYCLE WHICH IN TURN IS DIVIDED INTO A NUMBER OF TIME SLOTS. EACH AIRCRAFT IS ASSIGNED A TIME SLOT DURING WHICH IT MAY TRANSMIT INTELLIGENCE, INCLUDING A REFERENCE SIGNAL. INTELIGENCE IS COLLECTED DURING ALL OTHER TIMES. EACH AIRCRAFT, HAVING A COMMON TIME SCALE WITH ALL OTHER AIRCRAFT, MEASURES THE TRANSMISSION TIME OF EACH RECEIVED REFERENCE SIGNAL. THE TRANSMISSION TIME IS DIRECTBY PROPORTIONAL TO THE DISTANCE BEWEEN THE AIRCRAFT PROVIDING KNOWLEDGE UPON WHICH EVASIVE MANEUVER MAY BE BASED. SINCE THE VARIOUS AIRCRAFT WILL BE AT DIFFERING DIS-

TANCES FROM THE SATELLITE, COME ERROR WILL BE PRESENT IN THE MEASURED DISTANCE BETWEEN AIRCRAFT. CORRECTION IS ACCOMPLISHED BY TRANSMITTING THE MEASURED RANGE TO THE OTHER AIRCRAFT. THUS, EACH HAS AVAILABLE THE DISTANCE BETWEEN AIRCRAFT AS MEASURED AT EACH AIRCRAFT. THE AVERAGE OF THE TWO MEASURED RANGES IS COMPUTED AND YIELDS THE ACTUAL RANGE. A TIME GATE IS ALOS PROVIDED FOR EXCLUDING THE REFERENCE SIGNAL FROM AIRCRAFT WHICH CLEARLY PROVIDE NO DANGER TO THE AIRCRAFT IN QUESTION.

公开(公告)号：US3521279A

公开(公告)日：1970-07-21

申请号：US3521279D

申请日：1968-08-20

Applicant: SIERRA RESEARCH CORP

Inventor： MICHNIK LEWIS

IPC: G01S11/08 ,  G01S19/09 ,  G01S19/27 ,  G04G7/02 ,  G08G5/04 ,  G01S9/56

CPC classification number: G01S11/08 ,  G04R40/06

公开(公告)号：US3255900A

公开(公告)日：1966-06-14

申请号：US4288660

申请日：1960-07-14

Applicant: CONTROL DATA CORP

Inventor： WALTON GRAHAM

IPC: G01S11/08

CPC classification number: G01S11/08

公开(公告)号：US3250896A

公开(公告)日：1966-05-10

申请号：US18783262

申请日：1962-04-16

Applicant: MCDONNELL AIRCRAFT CORP

Inventor： PERKINSON ROBERT E ,  VON FANGE WILBUR H ,  BORROK MARTIN J

IPC: G01S11/08 ,  G04G7/02

CPC classification number: G01S11/08 ,  G04R40/06

公开(公告)号：US11860261B2

公开(公告)日：2024-01-02

申请号：US17903094

申请日：2022-09-06

Applicant: Sonitor Technologies AS

Inventor： Endre Bakka ,  Wilfred Edwin Booij

IPC: G01S11/16 ,  G01S11/08 ,  H04W56/00

CPC classification number: G01S11/16 ,  G01S11/08 ,  H04W56/002

Abstract: A communication device including a clock, a memory, and at least one processor is disclosed. The at least one processor is configured to execute instructions stored in the memory that cause the at least one processor to perform operations including receiving at least one message from a second communication device of a plurality of communication devices over a preconfigured time duration, determining a first local time of the clock of the communication device at which the at least one message from the second communication device is received, and determining a sync-time of the second communication device based on the at least one message from the second communication device. The operations include mapping the sync-time of the second communication device based on the first local time and the determined sync-time of the second communication device and adjusting a sync-time of the communication device based on the second local time.

公开(公告)号：US20230408666A1

公开(公告)日：2023-12-21

申请号：US18250886

申请日：2021-11-03

Applicant: LAMBDA:4 ENTWICKLUNGEN GMBH

Inventor： Rönne REIMANN

IPC: G01S11/08

CPC classification number: G01S11/08

Abstract: A method for one-sided radio-based distance measurement. The object is to speed up the determination of the distance between a first object and a second object, to enable greater accuracy and/or to enable or improve the determination, even in the event of interference, particularly in the case of one-sided and/or asymmetric interference in the radio connection. The method is carried out largely without radio signals in a transmission direction. The method includes use of a transit time measurement between the first object and the second object to eliminate the ambiguity of the distance measurement; the distance measurement being carried out on the basis of a change in the phase shift, in particular relative to the frequency change, of the signal propagation from the first object to the second object as a result of a frequency change.

公开(公告)号：US20230408664A1

公开(公告)日：2023-12-21

申请号：US18250835

申请日：2020-11-04

Applicant: LAMBDA:4 ENTWICKLUNGEN GMBH

Inventor： Rönne REIMANN

IPC: G01S11/08

CPC classification number: G01S11/08

Abstract: The invention relates to a method for a one-sided radio-based distance measurement. The inventor has ascertained that, surprisingly, between time-synchronized objects, in particu-lar with a phase-coherent frequency change, it is possible to ob-viate the need for a transmission direction. This is achieved by a method for measuring distances between two objects, wherein the two objects are time-synchronized to IO ns or better, a first and/or second of the two objects emits signals at multiple frequen-cies, and the distance between the first and second object is deter-mined. The invention is characterized in that the method includes the process of deciding whether/which signals of the first object or the second object are used, in particular on the basis of at least one estimation or determination of the influence of interference on the reception of both objects.

公开(公告)号：US11762056B2

公开(公告)日：2023-09-19

申请号：US16961515

申请日：2019-01-11

Applicant: Red Point Positioning Corporation

Inventor： ZhenZhen Ye ,  Chunjie Duan ,  Georgiy Pekhteryev

IPC: G01S5/10 ,  G01S11/08 ,  H04W64/00 ,  H04W4/02 ,  G01S5/00 ,  G01S5/14 ,  G01S5/02

CPC classification number: G01S5/14 ,  G01S5/0027 ,  G01S5/0036 ,  G01S5/021 ,  G01S5/02213 ,  G01S5/10 ,  G01S11/08 ,  H04W4/023 ,  H04W64/003 ,  G01S5/0247

Abstract: Systems and methods for locating a position of a target object (110, 210, 410) are provided. The target object can be equipped with a plurality of spatially distributed antennas (220a, 220b, 420a, 420b), and can be located within a network of a plurality of anchors (105, 305, 505) at fixed locations. A plurality of anchor pairs (105a, 105b, 305a, 305b, 505a, 505b) can be assigned. Each anchor pair can include at least two anchors. The anchor pairs can transmit and receive range request, REQ, and range response, RSP, packets (1210,1215,1220). The REQ and RSP packets can be received by the antennas on the target object (1225,1230). Distance differences between the target object to the first anchor and from the target object to the second anchor of each anchor pair can be estimated (1235), based on times at which the REQ packet and the RSP packet are received at the target object. The position of the target object can be estimated based on the distance differences (1240).