Range estimation using direct sequence spread spectrum
In this paper, we have designed a radar transmitter and receiver using direct sequence spread spectrum for improving range accuracy. Spread spectrum modulation technique has been chosen as it has some inherent merits like accuracy of ranging, sensitivity of power estimation, interference suppression etc.
The most well-known and widely employed spread spectrum modulation technique, direct sequence makes use of noise-like sequences in order to spread the bandwidth of an information signal. It is this spreading that characterizes spread spectrum and yields the benefits of such modulation. The heart of direct sequence lies in the noise-like sequences.
Direct sequence spread spectrum (DS/Ss) ranging technique: The used method is the direct-sequence spread spectrum ranging technique, as shown in figure (2). This technique has been used in GPS C/A (Clear/Acquisition) code and P (Precise) code.
Impact of finite bandwidth for inter-satellite ranging using direct ...
Evaluating the accuracy of spread spectrum receiver under finite bandwidth is still hard and few researches focus on that. In this paper, we build the signal model of DSSS signal under finite bandwidth, and then derive the mathematic form of error function.
Range estimation using direct sequence spread spectrum
2014年4月3日 · This paper proposes a Direct sequence spread spectrum (DSSS) based radar altimeter that offers good resolution and low probability of intercept and carried out MATLAB simulations of the system and verified the results with a scaled down prototype model.
Mobile ranging using low-accuracy clocks - IEEE Xplore
2000年6月30日 · Our position-location technique provides location information within milliseconds and is integrated in a handheld direct-sequence spread-spectrum (DSSS) communications system. We use a standard DSSS waveform, with a state of-the-art chipping rate to provide a position location capability to an accuracy of less than 1 m in a severe multipath ...
Direct-sequence spread spectrum - Wikipedia
In telecommunications, direct-sequence spread spectrum (DSSS) is a spread-spectrum modulation technique primarily used to reduce overall signal interference. The direct-sequence modulation makes the transmitted signal wider in bandwidth than the information bandwidth.
Range estimation using direct sequence spread spectrum
2014年4月1日 · In this paper, we have designed a radar transmitter and receiver using direct sequence spread spectrum for improving range accuracy. Spread spectrum modulation technique has been chosen...
Continuous wave ranging systems have an inherent problem of range ambiguity. Direct sequence spread spectmm is added to an existing commercial CW ranging system to elirninate the ambiguity and to capitalize on the other advantages that spread spectmm
In direct sequence (DS) spread spectrum systems, the amplitude of an already modulated signal is amplitude modulated by a very high rate NRZ binary stream of digits.