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Digitally programmable radio modules for navigation systems

  • US 5,909,193 A
  • Filed: 08/31/1995
  • Issued: 06/01/1999
  • Est. Priority Date: 08/31/1995
  • Status: Expired due to Fees
First Claim
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1. A programmable radio comprising:

  • an antenna for receiving RF signals corresponding to different radio modes;

    an analog submodule, coupled to said antenna and dynamically programmably reconfigurable for operation in each of the different radio modes in a time-interleaved sequence, for selectively frequency translating the RF signals corresponding to the different radio modes to provide corresponding IF signals;

    a digital submodule, coupled to said analog submodule, for digitally processing the IF signals to provide output signals for each of the different radio modes and for generating control signals for respectively reconfiguring said analog submodule for operation in each of the different radio modes;

    said digital submodule being dynamically programmably reconfigured in synchronism with the time-interleaved sequence into respective different configurations for operation in each of the different radio modes; and

    display means, coupled to said digital submodule, for providing mode information to a system user for each of the different radio modes in the time-interleaved sequence;

    said digital submodule comprising;

    at least one field programmable gate array dynamically reconfigurable into the respective different configurations to perform digital processing during each of the different radio modes;

    a narrowband analog/digital converter, coupled to said analog submodule, for converting the IF signals into digital signals;

    a digital downconverter, coupled to said narrowband analog/digital converter, for respectively generating and mixing in-phase and quadrature local oscillation signals with the digital signals to output in-phase and quadrature signals; and

    a filter, coupled to said digital downconverter, for selectively decimating the in-phase and quadrature signals based on the current radio mode of the in-phase and quadrature signals;

    said at least one field programmable gate array storing the decimated in-phase and quadrature signals, said digital submodule further comprising;

    digital signal processing means, coupled to said at least one field programmable gate array, for performing envelope detection on the stored in-phase and quadrature signals, selective discrete fourier transformation of the envelope detected signal based on the current radio mode of the envelope detected signal and selective difference in depth demodulation of the fourier transformed signal based on the current radio mode of the fourier transformed signal to provide the output signal of said digital submodule.

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