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卫星信道模拟器

卫星信道模拟器

产品简介:

The Satellite Delay Simulator (SDS) allows high-speed sampling and delaying of the input data in order to realize typical satellite delays and variations. The SDS has an on-board oscillator, which uses the external 10MHz reference and operates at 440MHz. The 440MHz-sampling rate allows direct IF interfacing to the system.

产品分类:

无线通信 物联网 网络层 无线通信产品

品牌:

产品介绍

详细信息

- 内置2个互相独立的衰落通道, 模拟地面站至卫星, 卫星至地面站完整无线通道
- 信道带宽支持最高72MHz
- L, C, Ka,Ku波段上下变频器可选
- 模拟连续变化的时延多普勒和频移多普勒
- 高斯白噪声和雨衰环境模拟
- 卫星轨道偏置和移动模拟
 

 

The input signal is sampled with an 8-bit A/D at the operating frequency. Each 8-bit sample is stored in 16-sample (128-bit) words in the main memory. The main memory consists of 96Mbytes of high-speed SRAM. The memory words are read out and re-converted through an 8-bit D/A on the output. The main memory is split into 3 banks. The banks are written to and read from continuously. The delays between the read and the write pointers are always maintained so that the same bank is never being read and written to at the same time. This mechanism supports the operating range of 110.0ms to 150.0ms. Additionally, the SDS supports a bypass mode (= 500ns). This is the default power-up condition.

Once a new profile is started, the SDS can change the delay (increment or decrement) by a single sample. This means that the delay can be changed by 2.2727ns for each increment or decrement. In the case of an increment, the same sample is repeated for one extra time sample (2.2727ns). In the case of a decrement, a single sample is dropped from the output. The timing for dropping or adding of a sample can be synchronized to an external signal to prevent samples being changed randomly with respect to the signal carrier.

When running a variable profile, the SDS interpolates the rate of change over time. For example, if the user selects a rate of change of 100ns then the SDS interpolates and makes (approx) 100.0 / 2.2727 = 44 changes per second. This interpolation provides the smoothest variation of the profile over time.

Features:
-
 User programmable delays between 110ms and 150ms with a resolution of 2.27 ns
- 440 MHz sampling rate with 8 bit samples
- 80 Mhz bandwidth
- Satellite orbit simulation is supported by sinusoidal changes of ± 20.10e6 * sin (2p t/24.3600) ns where t is in seconds, with a resolution of 2.27ns in each path
- A maximum inclined orbit simulation is supported by linear changes of up to ± 200ns/sec with a resolution of  2.27ns in each path. 
- Delay changes are performed smoothly by adding in and dropping 1 sample at the profile rate
- All control settings are set via a simple Windows® based GUI operating under Microsoft Windows® running on an external PC with 
a 9-pin RS-232 interface
- User programmable delay modes: Bypass (No Delay), Linear / Limit Profile, Linear / Cyclic Profile and  fixed delay
- Gain is user programmable from 0 to 20 dB. At maximum gain, -17 dBm input achieves full-scale output.

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