| 摘要 |
PURPOSE:To decrease the number of delay lines and to perform quickly the acquisition of synchronism, by receiving freely plural hopping frequencies in accordance with a hopping pattern and adding the output of these hopping frequencies to obtain the output signal of a level proportional to the out-of-synchronism and by controlling the demodulating local reference wave with the above-mentioned output signal. CONSTITUTION:The input spectrum spreading signal supplied through a receiving antenna 1 is received at a high speed at a high-speed switch receiving circuit 2 and with the output of a high-speed switch frequency synthesizer 3. At the same time, the hopping frequencies are selectively received at selective receiving circuits 5A-5C in response to the output of a control circuit 4 and in accordance with a hopping pattern. The delays are given through delaying circuits 6A and 6B in response to the patterns of the circuits 5A and 5B and with each hopping frequency. Thus the single position modulating signal is delivered through the circuits 5A-5C respectively. These modulating signals are added together at an adder circuit 7 and applied to the circuit 4. The circuit 4 controls the synthesizer 3 in accordance with a program which is previously incorporated, and at the same time the circuits 5A-5C are controlled. Thus the constitution is simplified for a receiving device. |
