Boots – shoes – and leggings
Patent
1989-09-14
1992-03-03
Lall, Parshotam S.
Boots, shoes, and leggings
G06G 778
Patent
active
050938002
ABSTRACT:
A test transmitter apparatus has been designed for testing global positioning system (GPS) receivers. This test transmitter apparatus has the ability to generate a radio frequency (RF) output which simulates GPS satellite signals. Generally, the RF test signal is generated as follows: A digital test signal is produced by a signal generator which is driven by specific programs run on a suitably adapted computer. The digital signal is then converted to a RF signal by a numerical control oscillator and an analog converter.
REFERENCES:
patent: 4701934 (1987-10-01), Jasper
patent: 4910525 (1990-03-01), Stulken
Kramsky Elliott N.
Lall Parshotam S.
Zanelli Michael
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