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Additional resources for Autonomous Software-Defined Radio Receivers for Deep Space Applns
2-7. Flow diagram of the Viterbi code node synchronizer. 1 XA = (NS/Nφ)*Sφmin Note: NS = k*Nφ, K = 1,2,4,8 UL = 0 Set Phase (one with Sφmin) Tracking Loop 0 ≤ α1 ≤ 1024 Sφmin = min(S0,S1) ≤ α1 1 Sφmax = max(S0,S1) 1 0 ≤ α0 ≤ 255 Acquisition Loop ∆φ = |S1–S0| ≤ α0 Integrate Φ1 (S1, Nφ) Integrate Φ0 (S0, Nφ) Set Tφ = 255 Reset 36 Chapter 2 The Electra Radio 37 The tracking-error-count threshold TS is computed based on both the averaged error count XA and the symbol SNR estimate. Initially, the threshold is set equal to TR ≡ XA +∆S (∆S is a pre-determined constant between 0 and 255).
Electra modulator block diagram. Swept Frequency (Aid Acquisition) F0 System Clock NRZ/Man Pulse Shape NRZ/Man Pulse Shape cos δ Digital Modulator M To DAC F0 Fixed Frequency Offset Filter Bank Filter Bank 40 Chapter 2 The Electra Radio 41 the bipolar input levels to the complex multiplier depicted in Fig. 5 · Tpow (2 11) where Tpow is a programmable input parameter controlling the modulator output power. 5 · Tpow · sin β (2 12) (2 13) where β is the programmable modulation index parameter (nominally set to π/3 radians).
55–67, January 1982.  S. W. Asmar, “Characteristic Trends of Ultrastable Oscillators for Radio Science Experiments,” The Telecommunications and Data Acquisition Progress Report 42-129, January–March 1997, Jet Propulsion Laboratory, Pasadena, California, pp. 1–5, May 15, 1997. pdf  S. Hinedi, “A Functional Description of the Advanced Receiver,” The Telecommunications and Data Acquisition Progress Report 42-100, October– December 1989, Jet Propulsion Laboratory, Pasadena, California, pp. 131– 149, February 15, 1990.