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True Heading Patent Ab

Anders Bergström

Nils Willart

Bengt Johansson

A method for determining the time of receipt by a radio receiver of a binary coded radio message emitted by a sender. A radio signal containing the message is received by the receiver. An analog electrical signal is generated, sampled and optionally demodulated. The data content of the message is determined based upon the demodulated signal as a stream of data bits. The stream of data bits comprises a predetermined signal element whose time of receipt is determined. A digitally stored, constructed comparison signal is created based upon the stream of data bits. The constructed comparison signal is constructed to correspond to the sampled signal, in that a time variable which maximizes a correlation between the constructed comparison signal and the sampled signal is determined, and in that the time variable is then used to correct the time determination of the receipt of the predetermined signal element.

Method for determining the timing of the receipt of a radio message

A method of sending the value of a status variable from a sending device to a receiving device as part of a standardized binary coded radio message. The message includes fields for predetermined information to be sent with the message as well as a buffer field. The method includes causing the sending device to assemble, calculate a checksum for, digitally store and periodically transmit a predetermined type of message in the form of a radio signal readable by a receiving device. The status variable is not related to the predetermined information. Before the checksum is calculated, the sending device inserts the value of the status variable in binary coded format into the message in a buffer field. According to a governing messaging standard, the buffer field is not intended to transmit information. The receiving device interprets the binary value as the value of the status variable.

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Djursholm, Sweden

Anders Bergström