GB2003354A - Method of and apparatus for measuring distance between two transmitting stations - Google Patents
Method of and apparatus for measuring distance between two transmitting stationsInfo
- Publication number
- GB2003354A GB2003354A GB7831844A GB7831844A GB2003354A GB 2003354 A GB2003354 A GB 2003354A GB 7831844 A GB7831844 A GB 7831844A GB 7831844 A GB7831844 A GB 7831844A GB 2003354 A GB2003354 A GB 2003354A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- aircraft
- coded
- reply
- ground station
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
- G01S13/84—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted for distance determination by phase measurement
-
- 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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/79—Systems using random coded signals or random pulse repetition frequencies, e.g. "Separation and Control of Aircraft using Non synchronous Techniques" [SECANT]
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
A distance measuring system includes a ground station transponder continuously transmitting a repeating pseudorandom coded bit pattern, and at least one aircraft interrogator receiving, locking onto and repeating the ground station signal. The aircraft interrogator transmits a coded interrogation signal in precise synchronism with an identically coded with an arbitrarily selected any one of the code words in the repeated ground station signal and waits for a reply. If the ground station receives the coded interrogation signal in synchronism with an identically coded word in its continuous transmission, it transmits a reply signal to the aircraft interrogator optionally encoded with synchronism error or interrogation steering information. If no reply is received by the aircraft interrogator, it transmits its next coded interrogation signal shifted by one or more bits relative to said selected code word. Successive interrogation signals are shifted an additional predetermined number of bits until synchronism is attained and a reply signal is received. The number of bits of shifting performed by the aircraft needed for synchronization when combined with the number of bits representing the whole code word intervals elapsing between transmission of an interrogation and receipt of a reply represents the distance between the ground station and aircraft.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82700977A | 1977-08-23 | 1977-08-23 | |
US05/874,480 US4128835A (en) | 1977-08-23 | 1978-02-02 | Method and apparatus for measuring distance between an aircraft and a ground station |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2003354A true GB2003354A (en) | 1979-03-07 |
GB2003354B GB2003354B (en) | 1982-03-03 |
Family
ID=27125052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7831844A Expired GB2003354B (en) | 1977-08-23 | 1978-08-01 | Method of and apparatus for measuring distance between two transmitting stations |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA1112339A (en) |
GB (1) | GB2003354B (en) |
-
1978
- 1978-07-25 CA CA308,100A patent/CA1112339A/en not_active Expired
- 1978-08-01 GB GB7831844A patent/GB2003354B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA1112339A (en) | 1981-11-10 |
GB2003354B (en) | 1982-03-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960801 |