| 摘要 |
<p>PURPOSE:To simplify constitution and to stabilize operations by providing an angle modulation means, a frequency multiplying means, a frequency divider means and a spreading code generation means, spread-modulating a multiplication angle modulated wave by an obtained spreading code and outputting it. CONSTITUTION:Information signals are supplied from an input terminal In 1 to an angle modulation circuit 52 and frequency modulation being primary modulation is performed. Frequency modulated signals are supplied to a frequency multiplier 53 and a carrier frequency f0 and frequency shift are multiplied by N1 to be supplied to a multiplier 6 for spread modulation. In the meantime, the frequency modulated signals are also supplied to a frequency divider 28, a basic carrier frequency becomes f0/N2 and the frequency shift becomes DELTAf/N2. Frequency divided output signals are supplied to the spreading code generator PNG 48 as clock signals with the frequency Fc and the spreading codes are generated based on the clock signals. The spreading codes are supplied through an LPF 31 to the multiplier 6, spectrum spreading by multiplication with frequency modulated waves is performed and output is performed from a transmission antenna A1 through an amplifier 16.</p> |
