GB1452509A - Two-carrier instrument landing system - Google Patents
Two-carrier instrument landing systemInfo
- Publication number
- GB1452509A GB1452509A GB5873673A GB5873673A GB1452509A GB 1452509 A GB1452509 A GB 1452509A GB 5873673 A GB5873673 A GB 5873673A GB 5873673 A GB5873673 A GB 5873673A GB 1452509 A GB1452509 A GB 1452509A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mhz
- course
- oscillator
- signals
- frequency
- 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.)
- Expired
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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Radar Systems Or Details Thereof (AREA)
- Radio Relay Systems (AREA)
Abstract
1452509 Radio navigation INTERNATIONAL STANDARD ELECTRIC CORP 19 Dec 1973 [19 Jan 1973] 58736/73 Heading H4D An instrument landing system (ILS) includes localizer and glide slope transmitting stations, each generating clearance and course radiation patterns, the clearance carrier frequencies lying respectively within the ranges 108 to 112 MHz and 328 to 336 MHz. At least one of the course carrier frequencies lies in the microwave region (over 1000 MHz) and at an airborne receiver is converted into the range of the carrier frequency for the associated clearance radiation pattern, the two signals then being applied to a further stage of the receiver. Deviations from course are determined by comparing in the receiver the depths of modulation by 90 Hz and 150 Hz signals. As described, the localizer transmitter station comprises a 110 MHz oscillator 1, Fig. 1, outputs from which are modulated in modulators 2, 3 by 90 Hz and 150 Hz signals respectively. A bridge 4 derives sum and difference outputs from said modulated signals and these are fed via a power divider 5 to an array of dipoles 5, which develops the clearance radiation pattern. A second oscillator 7 has a frequency of 110 MHz +9 kHz. The frequency difference from the oscillator 1 is necessary for the utilization of the capture effect in the airborne receiver as it comes within the narrow (Œ1 to 2 degrees) course radiation beam, and it is continuously monitored by a monitor 16 which is coupled to both oscillators. A third oscillator 9 has a frequency of 5000 MHz and output therefrom is mixed with output from the oscillator 7 to produce a signal of frequency 5110 MHz+9 kHz. This is amplified and is applied through modulators 11, 12, having respective modulation frequencies of 90 Hz and 150 Hz, and a bridge 13 which feeds an array of horns 15 producing the course radiation pattern. A 5000 MHz signal from the oscillator 9 is also radiated, either from an additional horn 18 or from the array 15, for reception aboard an aircraft and mixing with the course signals. The glide slope transmitting station is similar, except that the oscillators equivalent to nos. 1, 7 have frequencies of 330 MHz and 330 MHz+8 kHz, respectively. An airborne ILS receiver comprises conventional localizer and glide slope equipment comprising aerials 30, 33, Fig. 3, receivers 31, 34 and cross-pointer instrument portions 32a, 32b, respectively. Additional equipment comprises a microwave receiving horn 39, a mixer 40 containing a tunnel or point-contact diode and converting the course signal frequencies to 110 MHz+9 kHz and 330 MHz+8 kHz using the 5000 MHz reference signal from the transmitting station. The frequency-converted signals are separated by filters 36, 37 and are applied as inputs to respective bridges 35, 38, which also receive inputs from the aerials 30, 33. Outputs from the bridges 35, 38 are applied to the receivers 31, 34. The airborne ILS receiver described may also be used when landing at an airport equipped with conventional ILS facilities, for which purpose the additional equipment is ineffective. Conversely, an aircraft having conventional ILS equipment may utilize it when landing at an airport equipped as shown in Fig. 1 by making use of only the clearance radiation patterns. The use of microwaves for the course radiations pattern obviates multipath reflections which might cause distortions.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732302653 DE2302653C3 (en) | 1973-01-19 | Double carrier instrument landing system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1452509A true GB1452509A (en) | 1976-10-13 |
Family
ID=5869454
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5873673A Expired GB1452509A (en) | 1973-01-19 | 1973-12-19 | Two-carrier instrument landing system |
Country Status (3)
Country | Link |
---|---|
ES (1) | ES422436A1 (en) |
GB (1) | GB1452509A (en) |
ZA (1) | ZA7498B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2380881A (en) * | 2001-10-10 | 2003-04-16 | Roke Manor Research | Estimating the angle of arrival at a mobile terminal |
-
1973
- 1973-12-19 GB GB5873673A patent/GB1452509A/en not_active Expired
-
1974
- 1974-01-07 ZA ZA740098A patent/ZA7498B/en unknown
- 1974-01-19 ES ES422436A patent/ES422436A1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2380881A (en) * | 2001-10-10 | 2003-04-16 | Roke Manor Research | Estimating the angle of arrival at a mobile terminal |
GB2380881B (en) * | 2001-10-10 | 2005-08-24 | Roke Manor Research | Method for estimating angle of arrival at a mobile terminal |
Also Published As
Publication number | Publication date |
---|---|
ZA7498B (en) | 1974-11-27 |
DE2302653B2 (en) | 1976-06-16 |
AU6438574A (en) | 1975-07-10 |
ES422436A1 (en) | 1976-05-01 |
DE2302653A1 (en) | 1974-08-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA1318013C (en) | Decorrelation tolerant coherent radio altimeter | |
US2768372A (en) | Randomly pulsed radio ranging system | |
GB586315A (en) | Improvements in or relating to secret radio communication | |
US4023171A (en) | Microwave velocity sensor using altimeter echo | |
GB1214746A (en) | Precision interferometer navigation system | |
US4106022A (en) | Radio position-determining system | |
US2546973A (en) | Arrangement for determining distance by means of electromagnetic waves | |
GB581344A (en) | Improvements in or relating to systems of secret radio communication | |
US2424796A (en) | Superheterodyne radio altimeter or locator | |
GB1165771A (en) | Improvements in or relating to Apparatus for the Measurement of Distances by the use of Coherent Electromagnetic Radiation | |
US4959654A (en) | Digitally generated two carrier phase coded signal source | |
US3887922A (en) | Instrument landing system with microwave course pattern transmission | |
GB1452509A (en) | Two-carrier instrument landing system | |
GB1303510A (en) | ||
GB1153811A (en) | Coherent CATV Transmission System | |
US3594796A (en) | Distance measuring | |
GB750327A (en) | Improvements in or relating to radar navigational aid systems | |
US3339196A (en) | Radio locating systems | |
US2611124A (en) | Blind landing system | |
GB802008A (en) | Improvements in or relating to frequency stabilisation of continuous wave radar systems | |
US3560980A (en) | Position finding system | |
GB563076A (en) | Radio beacon | |
GB1086924A (en) | Tracking system for a communication satellite | |
GB652709A (en) | Improvements in or relating to navigational warning systems employing radio beacons | |
US2892189A (en) | Radio guidance system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |