Comprehensive automatic vehicle communication, paging, and position location system

Claim 3

each code word specifying a unique communication function,

Claim 4

each code word specifying a unique communication function,

Claim 5

A method as defined in claim 1 wherein said binary code words are from the class of linear maximal binary sequences and linear nonmaximal preferred polynomial binary sequences.

Claim 6

time interval generating means for controlling said code word generating means to generate a repetitive sequence of identical pairs, the time interval between the code words in each pair being above or below a predetermined value,

Claim 7

time interval generating means for controlling said code word generating means to generate a repetitive sequence of identical pairs, the time interval between the code words in each pair being above or below a predetermined value,

Claim 8

second detecting means controlled by said first detecting means for detecting the modulating binary code word,

Claim 9

second detecting means controlled by said first detecting means for detecting the modulating binary code word,

Claim 10

decoding means for decoding selected pairs of code words detected by said second detecting means,

Claim 11

decoding means for decoding selected pairs of code words detected by said second detecting means,

Claim 12

means for selecting one of said unique binary code words for transmission,

Claim 13

means for selecting one of said unique binary code words for transmission,

Claim 14

A vehicle communication system for transmitting messages and commands between at least one central station and one or more of a plurality of mobile stations, comprising: a. a central radio transmitter including

Claim 15

A vehicle communication system for transmitting messages and commands between at least one central station and one or more of a plurality of mobile stations, comprising: a. a central radio transmitter including

Claim 16

the time interval between the code words in each pair being above or below a predetermined value, b. transmitting from said first station, on a local frequency determined by the length of said time interval, selected messages following code word pairs having time intervals above said predetermined value, code word pairs having time intervals below said predetermined value uniquely specifying a relatively brief message or command, c. receiving at said second station said single carrier frequency with a receiver having a first channel permanently tuned to said single carrier frequency, d. decoding selected pairs of the transmitted code words, e. generating, in response to a decoded selected pair of code words having a time interval below said predetermined value, a first signal for controlling a device, and f. generating, in response to a decoded seleCted pair of code words having a time interval above said perdetermined value, a second signal dependent on said time interval for automatically tuning a second channel in said receiver to said local frequency to receive said selected messages following code words pairs having time intervals above said predetermined value.

Claim 17

the time interval between the code words in each pair being above or below a predetermined value, b. transmitting from said first station, on a local frequency determined by the length of said time interval, selected messages following code word pairs having time intervals above said predetermined value, code word pairs having time intervals below said predetermined value uniquely specifying a relatively brief message or command, c. receiving at said second station said single carrier frequency with a receiver having a first channel permanently tuned to said single carrier frequency, d. decoding selected pairs of the transmitted code words, e. generating, in response to a decoded selected pair of code words having a time interval below said predetermined value, a first signal for controlling a device, and f. generating, in response to a decoded seleCted pair of code words having a time interval above said perdetermined value, a second signal dependent on said time interval for automatically tuning a second channel in said receiver to said local frequency to receive said selected messages following code words pairs having time intervals above said predetermined value.

Claim 18

first means for modulating a first carrier frequency signal with the repetitive sequence of pairs of the selected code word,

Claim 19

first means for modulating a first carrier frequency signal with the repetitive sequence of pairs of the selected code word,

Claim 20

means connected to the output of said decoding means for measuring the time interval between each pair of decoded binary code words,

Claim 21

means connected to the output of said decoding means for measuring the time interval between each pair of decoded binary code words,

Claim 22

A vehicle communication system as defined in claim 3 further comprising a mobile radio transmitter associated with said mobile receiver and responsive to one of said unique pairs of spaced code words to transmit a message.

Claim 23

A communication system as defined in claim 4 further comprising memory means at said mobile receiver for storing a plurality of messages, and means responsive to said first set of output signals for selecting one of said stored messages for transmission.

Claim 24

switching matrix means connected to the outputs of said decoding means and said time interval measuring means for generating a first set of output signals if the time interval between code word pairs is below said predetermined value, and a second output signal if the time interval between code word pairs is above said predetermined value,

Claim 25

switching matrix means connected to the outputs of said decoding means and said time interval measuring means for generating a first set of output signals if the time interval between code word pairs is below said predetermined value, and a second output signal if the time interval between code word pairs is above said predetermined value,

Claim 26

a source of long duration message signals, and

Claim 27

a source of long duration message signals, and

Claim 28

second means for modulating a second carrier frequency signal with said long duration message signals between the transmission of pairs of the selected code words, b. at least one mobile receiver having a first channel permanently tuned to said first carrier frequency and a second tunable channel, including

Claim 29

second means for modulating a second carrier frequency signal with said long duration message signals between the transmission of pairs of the selected code words, b. at least one mobile receiver having a first channel permanently tuned to said first carrier frequency and a second tunable channel, including

Claim 30

output means responsive to said first set of output signals for providing message or command outputs,

Claim 31

output means responsive to said first set of output signals for providing message or command outputs,

Claim 32

A communication system as defined in claim 4 wherein said message is transmitted on said first carrier frequency.

Claim 33

A communication system as defined in claim 6 further comprising additional pairs of associated remote radio receivers and transmitters.

Claim 34

automatic channel tuning means responsive to said second output signal for automatically tuning said second channel to said second carrier frequency to receive said long duration message signal, and

Claim 35

automatic channel tuning means responsive to said second output signal for automatically tuning said second channel to said second carrier frequency to receive said long duration message signal, and

Claim 36

means for detecting the cessation of said second carrier frequency signal for retuning said second channel to its original frequency at the end of said long duration message signal.

Claim 37

means for detecting the cessation of said second carrier frequency signal for retuning said second channel to its original frequency at the end of said long duration message signal.

Claim 38

A vehicle communication system as defined in claim 4 wherein said message is transmitted on another local frequency determined by the time interval of a detected code word pair, and further comprising a central receiver associated with said central transmitter for receiviNg the transmitted message on said other local frequency.

Claim 39

A vehicle communication system as defined in claim 3 wherein said mobile receiver is located in a vehicle, and further comprising a. a mobile transmitter in said vehicle for transmitting a single code word on another carrier frequency; b. a remote transponder for receiving and retransmitting said single code word; c. a third channel in said mobile receiver and tuned to said other carrier frequency for receiving the retransmitted code word; and d. timing means for generating a timing signal indicative of the time interval between the transmission of said single code word and the reception of the said single code word retransmitted by said transponder.

Claim 40

A vehicle communication system as defined in claim 9 wherein said first carrier frequency and said other carrier frequency are identical and said transponder is located in another vehicle so that said timing signal is indicative of the spacing between the two vehicles.

Claim 41

A vehicle communication system as defined in claim 3 wherein said binary code words are chosen from the class of linear maximal binary sequences and linear non-maximal preferred polynomial sequences and said decoding means comprises a digital matched filter.

Claim 42

A vehicle communication system as defined in claim 11 further comprising: a. a mobile radio transmitter associated with said mobile radio receiver and responsive to a single code word from said central radio transmitter to retransmit said single code word; b. a central radio receiver associated with said central transmitter for receiving the retransmitted single code word; and c. timing means in said central receiver for measuring the time interval between the transmission of said single code word and the reception of the said retransmitted single code word.

Claim 43

A vehicle communication system as defined in claim 3 wherein said central radio transmitter and said mobile receiver are located in different vehicles.

Claim 44

A vehicle communication system as defined in claim 3 wherein the messages and commands transmitted between said at least one central station and one or more of a plurality of mobile stations are divided into optional and non-optional categories, said decoding means in said receiver being divided into a plurality of channels designated either as optional or non-optional, said receiver further comprising: a. optional information request means for activating selected optional channels in said decoding means, and b. automatic reset means responsive to the second of the pair of code words decoded by said decoding means corresponding to a selected optional channel for deactivating that channel.

Claim 45

A vehicle communication system as defined in claim 14 wherein said receiver further comprises manual inhibiting means for inhibiting a selected one of said non-optional channels for a predetermined period of time.

Claim 46

A vehicle communication system as defined in claim 15 wherein said binary code words are chosen from the class of linear maximal binary sequences and linear non-maximal preferred polynomial sequences and each of said plurality of channels in said decoding means comprises a digital matched filter.

Claim 47

A vehicle communication system as defined in claim 3 wherein said source of long duration message signals comprises: a. storage means for storing said long duration message, and b. means for repetitively reading said long duration message out of said storage means to said second means for modulation under the control of said time interval generating means.

Claim 48

In a vehicle communication system for transmitting messages and commands between at least one central station and one or more of a plurality of mobile stations, said communication system including a central radio transmitter having means for generating a plurality of unique binary code words each specifying a different communication function, time interval generating means for controlling said codE word generating means to generate a repetitive sequence of identical pairs, the time interval between the code words in each pair being above or below a predetermined value, means for selecting one of said unique binary code words for transmission, first means for modulating a first carrier frequency signal with the repetitive sequence of pairs of the selected code word, a source of long duration message signals, and second means for modulating a second carrier frequency signal with said long duration message signals between the transmission of pairs of the selected code words, a mobile receiver comprising: a. a first channel permanently tuned to said first carrier frequency and a second tunable channel, b. first detecting means for detecting when said first carrier frequency signal exceeds a predetermined threshold, c. second detecting means controlled by said first detecting means for detecting the modulating binary code word, d. decoding means for decoding selected pairs of code words detected by said second detecting means, e. means connected to the output of said decoding means for measuring the time interval between each pair of decoded binary code words, f. switching matrix means connected to the outputs of said decoding means and said time interval measuring means for generating a first set of output signals if the time interval between code word pairs is below said predetermined value, and a second output signal if the time interval between code word pairs is above said predetermined value, g. output means responsive to said first set of output signals for providing a message or command output, h. automatic channel tuning means responsive to said second output signal for automatically tuning said second channel to said second carrier frequency to receive said long duration message signal, and i. means for detecting the cessation of said second carrier frequency signal for retuning said second channel to its original frequency at the end of said long duration message signal.

Claim 49

In a vehicle communication system for transmitting messages and commands between at least one central station and one or more of a plurality of mobile stations, said communication system including a central radio transmitter having means for generating a plurality of unique binary code words each specifying a different communication function, time interval generating means for controlling said codE word generating means to generate a repetitive sequence of identical pairs, the time interval between the code words in each pair being above or below a predetermined value, means for selecting one of said unique binary code words for transmission, first means for modulating a first carrier frequency signal with the repetitive sequence of pairs of the selected code word, a source of long duration message signals, and second means for modulating a second carrier frequency signal with said long duration message signals between the transmission of pairs of the selected code words, a mobile receiver comprising: a. a first channel permanently tuned to said first carrier frequency and a second tunable channel, b. first detecting means for detecting when said first carrier frequency signal exceeds a predetermined threshold, c. second detecting means controlled by said first detecting means for detecting the modulating binary code word, d. decoding means for decoding selected pairs of code words detected by said second detecting means, e. means connected to the output of said decoding means for measuring the time interval between each pair of decoded binary code words, f. switching matrix means connected to the outputs of said decoding means and said time interval measuring means for generating a first set of output signals if the time interval between code word pairs is below said predetermined value, and a second output signal if the time interval between code word pairs is above said predetermined value, g. output means responsive to said first set of output signals for providing a message or command output, h. automatic channel tuning means responsive to said second output signal for automatically tuning said second channel to said second carrier frequency to receive said long duration message signal, and i. means for detecting the cessation of said second carrier frequency signal for retuning said second channel to its original frequency at the end of said long duration message signal.