发明名称 |
METHOD AND APPARATUS FOR TRANSMITTING MONITOR DATA |
摘要 |
A method and apparatus for transmitting data from a monitoring station using frequency hopping and interval hopping as described. The output frequency of a transmitter in the monitoring station is hopped between selected output frequencies by retrieving random numbers from a table, generating a control voltage corresponding to the retrieved random number, applying the control voltage to an RF oscillator and transmitting a signal from a transmitter in the monitoring station using the signal from the RF oscillator as a carrier. The output frequency of the transmitter is limited between a maximum output frequency and a minimum output frequency by comparing the retrieved random number to data limits stored in a memory in the transmitter and rejecting retrieved random numbers outside of the retrieved limits. Interval hopping is realized by selecting a random number from the random number table, multiplying the random number by a fixed increment and adding the product to a minimum time interval.
|
申请公布号 |
CA2173061(A1) |
申请公布日期 |
1996.10.21 |
申请号 |
CA19962173061 |
申请日期 |
1996.03.29 |
申请人 |
SCHLUMBERGER INDUSTRIES, INC. |
发明人 |
ADAIR, HENRY HAROLD JR. |
分类号 |
G08C15/00;G08C17/02;(IPC1-7):H04B1/713 |
主分类号 |
G08C15/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|