Method for implementing continuous radio frequency (RF) alignment in advanced electronic warfare (EW) signal stimulation systems
First Claim
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1. A method for mapping an arbitrary RF Power command into hardware control signals used to produce a commanded RF Power at a Port output for each frequency, the method comprising:
- providing a level shift that maps an absolute Power Command, in units of dBm, to a relative power command, in units of dBfs;
providing a step attenuation state parser that computes the appropriate state for the step attenuator, and subtracts a step attenuator amplitude contribution from said relative power command, to compute an AM DAC attenuation;
providing a super-attenuation function that adjusts said AM DAC attenuation command to produce desired attenuation, adding any additional attenuation as required to compensate for non-linear effects of compression, wherein said super-attenuation function is implemented as a stored data table, in octave increments of dB, for each applicable range of step attenuation, with an exact value determined by means of quadratic interpolation at run time;
providing a theoretical conversion of said AM DAC attenuation command to hardware bits; and
providing a frequency-dependent offset for power leveling.
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Abstract
A method for characterizing the effect of each step attenuator state, on phase and amplitude, which may include in an exemplary embodiment: activating each step attenuator state as the sole contributor to attenuation, and measuring at least one of a step attenuator amplitude contribution (SAAC) and/or a step attenuator phase contribution (SAPC).
43 Citations
2 Claims
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1. A method for mapping an arbitrary RF Power command into hardware control signals used to produce a commanded RF Power at a Port output for each frequency, the method comprising:
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providing a level shift that maps an absolute Power Command, in units of dBm, to a relative power command, in units of dBfs; providing a step attenuation state parser that computes the appropriate state for the step attenuator, and subtracts a step attenuator amplitude contribution from said relative power command, to compute an AM DAC attenuation; providing a super-attenuation function that adjusts said AM DAC attenuation command to produce desired attenuation, adding any additional attenuation as required to compensate for non-linear effects of compression, wherein said super-attenuation function is implemented as a stored data table, in octave increments of dB, for each applicable range of step attenuation, with an exact value determined by means of quadratic interpolation at run time; providing a theoretical conversion of said AM DAC attenuation command to hardware bits; and providing a frequency-dependent offset for power leveling.
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2. The method of claim 1, wherein said providing said super-attenuation function in said octave increments of dB comprises:
providing said super-attenuation function in said octave increments of dB comprising at least one of 0, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, and/or 16.0.
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Current AssigneeAAI Corporation (Textron Inc)
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Original AssigneeAAI Corporation (Textron Inc)
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InventorsJaklitsch, James J., Markey, Jay, McGrath, Thomas P.
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Primary Examiner(s)LE, THANH C
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Application NumberUS12/700,269Publication NumberTime in Patent Office1,146 DaysField of Search455/67.11, 455/67.13, 455/115.1, 455/226.1, 455/226.2, 455/226.3, 375/222, 375/224, 324/76.12, 324/76.29US Class Current455/226.1CPC Class CodesG01R 31/2841 Signal generatorsG01R 35/005 Calibrating; Standards or r...
