Frequency agile radio

A method, using a frequency-agile receiver in a frequency-agile radio system, with a plurality of transmitters, each of said plurality of transmitters transmitting independently, for increasing receipt of signals and message data transmitted in a radio spectrum from the plurality of transmitters, comprising the steps of:

• scanning the radio spectrum;
• identifying occupied portions of the radio spectrum;
• updating information identifying the occupied portions;
• storing, in memory means, the updated information;
• associating a time-out period with the stored occupied portions;
• skipping over, during the time-out period, in response to the updated information and while receiving with the frequency-agile receiver, the occupied portions of the radio spectrum;
• and
• receiving a radio signal on a single frequency from one of the plurality of transmitters.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from a plurality of transmitters, transmitting on a plurality of pseudo-random frequencies, comprising the steps of:

• sweeping a radio spectrum;
• determining if a repetitive PREAMBLE SYSTEM CODE is present in a radio signal on a single frequency continuous in time;
• detecting the repetitive PREAMBLE SYSTEM CODE in the radio signal;
• maintaining, respective to detecting the repetitive PREAMBLE SYSTEM CODE, the single frequency;
• decoding,responsive to detecting the repetitive PREAMBLE SYSTEM CODE, message-data;
• and
• continuing, responsive to not detecting the repetitive PREAMBLE SYSTEM CODE, to sweep the radio spectrum.

A method, using a frequency-agile receiver in a frequency-agile radio system for increasing receipt of message data transmitted in a radio spectrum, comprising the steps of:

• scanning the radio spectrum;
• identifying occupied portions of the radio spectrum;
• updating information identifying the occupied portions;
• storing, in memory means, the updated information;
• associating a time-out period with the stored occupied portions;
• skipping over, during the time-out period, in response to the updated information and while receiving with the frequency-agile receiver, the occupied portions of the radio spectrum;
• measuring received energy at an initially wide intermediate frequency band;
• detecting a repetitive PREAMBLE SYSTEM CODE in a radio signal;
• and
• narrowing, upon detection of the PREAMBLE SYSTEM CODE, the bandwidth of the intermediate frequency band prior to detecting data to improve carrier to noise ratio.

A method, using a frequency-agile receiver in a frequency-agile radio system, comprising the steps of:

• measuring received energy at an initially wide intermediate frequency band;
• sweeping a radio spectrum;
• determining if a repetitive PREAMBLE SYSTEM CODE is present in a radio signal;
• detecting the repetitive PREAMBLE SYSTEM CODE;
• narrowing, upon a signal detection, the bandwidth of the intermediate frequency band prior to detecting data to improve carrier to noise ratio;
• decoding, responsive to detecting the repetitive PREAMBLE SYSTEM CODE, message-data;
• and
• continuing, responsive to not detecting the repetitive PREAMBLE SYSTEM CODE, to sweep the radio spectrum.

A method, using a frequency-agile receiver in a frequency-agile radio system, comprising the steps of:

• sweeping a radio spectrum;
• detecting the presence of a radio carrier;
• determining if a repetitive PREAMBLE SYSTEM CODE is present in a radio signal on a single frequency of the radio carrier;
• detecting the repetitive PREAMBLE SYSTEM CODE on the single frequency;
• frequency locking, responsive to detecting the PREAMBLE SYSTEM CODE, for compensating for transmitter and receiver frequency drift;
• decoding, responsive to detecting the repetitive PREAMBLE SYSTEM CODE, message-data;
• and
• continuing, responsive to not detecting the repetitive PREAMBLE SYSTEM CODE, to sweep the radio spectrum.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from a plurality of transmitters transmitting information messages on a plurality of pseudo-random frequencies, comprising the steps of:

• sweeping an available frequency band;
• logging to memory occupied portions of the frequency band;
• transferring a list of the occupied portions to the plurality of transmitters;
• setting a wide received signal detection bandwidth;
• sweeping the wide received signal detection bandwidth using a voltage controlled oscillator;
• skipping, responsive to the list of occupied portions, the occupied portions of the frequency band during a time out period;
• detecting a radio signal from a transmitter;
• ceasing to sweep the wide received signal detection bandwidth;
• reducing the wide received signal detection bandwidth for increasing signal to noise ratio;
• enabling a frequency locked loop for reducing frequency drift between the receiver and the transmitter;
• decoding a PREAMBLE SYSTEM CODE;
• and
• decoding data.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from at least one transmitter transmitting information messages on a plurality of pseudo-random frequencies, comprising the steps of:

• sweeping an available radio spectrum;
• identifying occupied portions of the radio spectrum;
• storing the occupied portions in a memory;
• skipping, responsive to the memory, the occupied portions;
• detecting a radio signal from a transmitter on a channel;
• ceasing a sweep the available radio spectrum;
• determining if at least one of a repetitive preamble system code and a transmitter identifier is present in the radio signal;
• decoding data;
• continuing, responsive to at least one of detecting jamming and failing to detect data, to sweep the radio spectrum;
• and
• storing updated information in the memory identifying the channel as jammed.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from a plurality of transmitters transmitting information messages on a plurality of pseudo-random frequencies, comprising the steps of:

• sweeping an available radio spectrum;
• setting a sweep time less than a transmitted preamble time and greater than a bit time;
• measuring at least one of signal strength, quieting, and phase lock loop (PLL) lock detect output of the receiver;
• skipping over, responsive to a table in a memory, occupied portions of the available radio spectrum;
• detecting a radio signal from a transmitter on a channel;
• ceasing to sweep the available radio spectrum;
• determining if at least one of a repetitive preamble system code and a transmitter identifier is present in the radio signal;
• decoding at least one of the repetitive preamble system code and the transmitter identifier;
• continuing, responsive to not detecting at least one of the repetitive preamble system code and the transmitter identifier, to sweep the radio spectrum;
• and
• storing updated information in the memory.

A method, using a frequency-agile receiver in a frequency-agile radio system,for receiving signals from a plurality of transmitters transmitting information messages on a plurality of pseudo-random frequencies,comprising the steps of:

• sweeping an available radio spectrum using voltage controlled oscillating means;
• setting a sweep time less than a transmitted preamble time and greater than a bit time;
• calibrating the voltage controlled oscillating means with a divider and crystal;
• measuring at least one of signal strength, quieting, and phase lock loop (PLL) lock detect output of the receiver;
• skipping over, responsive to a table in a memory, occupied portions of the available radio spectrum marked as jammed;
• detecting a radio signal from a transmitter in a portion of the available radio spectrum not marked as jammed;
• ceasing to sweep the voltage controlled oscillating means;
• matching at least one of a repetitive preamble system code and a transmitter identifier with at least one of a preamble system code and a identifier of the receiver;
• and
• decoding data.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from a plurality of transmitters transmitting information messages on a plurality of pseudo-random frequencies, comprising the steps of:

• sweeping an available radio spectrum;
• measuring at least one of signal strength, quieting, and phase lock loop (PLL) lock detect output of the receiver;
• skipping over, responsive to a table in a memory, occupied portions of the available radio spectrum marked as jammed;
• detecting a radio signal from a transmitter on a channel in a portion of the available radio spectrum not marked as jammed;
• ceasing to sweep the available radio spectrum;
• enabling a frequency locked loop for reducing frequency drift between the receiver and the transmitter;
• decoding at least one of a repetitive preamble system code and a transmitter identifier;
• matching at least one of the repetitive preamble system code and the transmitter identifier with at least one of a preamble system code and a identifier of the receiver;
• decoding data;
• verifying data using error detection means;
• and
• storing, responsive to at least one of detecting jamming and failing to detect data, updated information in the table identifying the channel as jammed.

A method, using a frequency-agile receiver in a frequency-agile radio system, for receiving signals from a plurality of transmitters transmitting information messages on a plurality of pseudo-random frequencies, comprising the steps of:

• setting a wide received signal detection bandwidth;
• sweeping an available radio spectrum using voltage controlled oscillating means;
• setting a sweep time less than a transmitted preamble time and greater than a bit time;
• measuring at least one of signal strength, quieting, and phase lock loop (PLL) lock detect output of the receiver;
• skipping over, responsive to a table in a memory, occupied portions of the available radio spectrum during a time out period;
• detecting a radio signal from a transmitter on a channel in a portion of the available radio spectrum not marked as jammed;
• ceasing to sweep the available radio spectrum;
• reducing received signal detection bandwidth for increasing signal to noise ratio;
• decoding at least one of a repetitive preamble system code and a transmitter identifier;
• matching at least one of the repetitive preamble system code and the transmitter identifier with at least one of a preamble system code and a transmitter identifier of the receiver;
• decoding data;
• and
• storing, responsive to at least one of detecting jamming and failing to detect data, updated information in the memory associating a time out period with occupied channels.