tw3870 gps/glonass l1l2 双频双星测量天线
采用独特的tw3870 tallysman accutenna™
technology providing dual band gps l1 & l2 and glonass
技术提供gps l1和l2双频和glonass
g1 & g2 coverage and is especially designed for precision
g1和g2的覆盖范围，特别设计的精度
dual frequency positioning.
双频定位。
the tw3870 features a precision tuned, circular dual feed,
该tw3870具有精确的调整，圆形双馈，
stacked patch element. the signals from the two orthogonal
层叠贴片元件。从两个正交信号
feeds are combined in a hybrid combiner, amplified in a wideband
饲料组合在一个杂交组合，在宽带放大
lna, then band-split for narrow filtering in each band
低噪声放大器，然后带分离在每个频带窄滤波
and further amplified prior to recombination at the output.
并进一步扩增重组前的输出。
the tw3870 offers excellent axial ratio and a tightly grouped
该tw3870提供良好的轴比一个严格的分组
phase center variation.
相位中心变化。
the tw3870 covers gps l2 (1227.6mhz), glonass g2
该tw3870包括gps l2（1227.6mhz），glonass g2
(1248mhz centre), gps l1/waas/egnos/msas
（1248mhz中心），gps l1 / waas / egnos / msas
(1575.42mhz) and glonass g1 (1602mhz, centre).
（1575.42mhz）和glonass g1（1602mhz，中心）。
the tw3870 is housed in a through-hole mount, weatherproof
该tw3870坐落在一个通孔安装，耐候性
enclosure for permanent installations. l bracket or
永久性设备外壳。l型支架或
pipe mount (part numbers 23-0040-0, 23-0065-0
管安装（零件号23-0040-0，23-0065-0
respectively) are available for non-rooftop installation. a
分别）可用于非屋顶安装。一个
100mm ground plane is recommended for non-roof-top
100mm的接地平面被推荐用于非屋顶
installations.
装置。
this antenna has been calibrated by ngs.
该天线已校准的ngs。
this product is also available in an oem format.
本产品在oem格式也可。
applications
• precision gps position
• dual frequency rtk receivers
• mission critical gps timing
• military & security
• network timing and synchronization
features
• very low noise preamp, < 2db
• axial ratio: <2db typ.
• tight phase center variation
• lna gain 35 db typ.
• low current: 25 ma typ.
• esd circuit protection: 15 kv
• invariant performance from: +2.5 to 16vdc
benefits
• ideal for l1/l2 rtk surveying systems
• great multipath rejection
• increased system accuracy
• great signal to noise ratio
• ip67 and rohs compliant
antenna
patch architecture circular, dual feed, dual stacked patch
l2 gain (100mm ground plane), 1227.6-1246mhz 3 dbic min at zenith on 100mm ground plane
l1 gain (100mm ground plane), 1575.42mh-1606mhz 4.5 dbic min at zenith on 100mm ground plane
axial ratio, over full bandwidth, both l1 & l2 <2db typ., 3db max. at zenith
1db bandwidth, l2: 1227mhz-1250mhz l1: 1570mhz–1606mhz
polarization rhcp,
electrical
bandwidth l2: 1213mhz-1261mhz (filter bandwidth) l1: 1570mhz-1614mhz (filter bandwidth)
overall lna gain 35db typ, 32 db min, each of l1 and l2 bands,
gain variation with temperature. 3db max over operational temperature range
lna noise figure 2db max at 25°c
vswr (at lna output) <1.5:1
supply voltage range +2.5 to 16vdc nominal, up to 50mv p-p ripple
emi immunity 50v/meter, excepting l1+/-100mhz and l2 +/- 100mhz
supply current 25ma typ. at 25°c, 30ma max at 75°c.
esd circuit protection 15 kv air discharge.
out-of-band rejection l1 l2
<1500 mhz=>50 db <1184 mhz=>50 db
<1550 mhz=>36 db <1200 mhz=>30 db
>1640 mhz >60 db >1284 mhz >32 db
mechanicals & environmental
mechanical size, ground plane 66mm x 21mm (see drawing on other page), 100mm ground plane recommended
operating temperature range -40°c to +85°c
enclosure radome: asa plastic, base: zamak white metal
weight 185 g
attachment method permanent ¾” (19mm) through hole mount
environmental ip67, rohs and reach compliant
shock vertical axis: 50 g, other axes: 30 g
vibration 3 axis, sweep = 15 min, 10 to 200 hz sweep: 3 g

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北京北斗联星科技有限公司
薛云杰
18612719456
北京市西城区马连道11号一商大厦818