Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-02-02
1978-12-05
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 65R, 343 12R, G01S 904, G01S 956
Patent
active
041288351
ABSTRACT:
A distance measuring system is provided including a ground station transponder continuously transmitting a repeating pseudorandom coded bit pattern, and at least one aircraft interrogator receiving and locking onto the ground station signal. The aircraft interrogator transmits a coded interrogation signal in precise synchronism with an arbitrarily selected any one of the repetitive code words (bit patterns) that comprise the repeating pseudorandom coded bit pattern which are coded identically with the interrogation 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 the arbitrarily selected received code word from the ground station. Successive interrogation signals are each 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. The optionally encoded synchronism error and steering information is respectively utilized by the aircraft to more precisely calculate distance and alter its time of interrogation.
REFERENCES:
patent: 3530467 (1970-09-01), Attwood et al.
patent: 3530470 (1970-09-01), Sheftelman et al.
patent: 3900873 (1975-08-01), Bouvier et al.
patent: 4042923 (1977-08-01), Merrick
patent: 4072946 (1978-02-01), Kneefel
Arinc Research Corporation
Goodwin Lawrence
Wilbur Maynard R.
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